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Chapter15

Working with Sheet Metal

Components

After completing this chapter, you will be able to:

Set the parameters for creating the sheet metal parts. Create reliefs in the sheet metal component. Create the base wall and wall on the edge feature. Create wall by extrusion. Create flange walls on the sheet metal components. Create hems on the sheet metal components. Create teardrop on the sheet metal components. Create bends on the sheet metal components. Create flat pattern of the sheet metal components. Create surface stamp. Create bead stamp. Create curve stamp. Create a louver. Create flange cutout stamp. Create flange hole stamp.

Learning Objectives

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15-2 CATIA for Designers

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THE SHEET METAL COMPONENTSThe component having a thickness greater than zero and less than 12 mm is called a sheetmetal component. Sheet metal fabrication is a chipless process and is an easy way to createcomponents by using the manufacturing processes such as bending, stamping, and so on.

A sheet metal component of uniform thickness is shown in Figure 15-1. It is not possible tomachine such a thin component. After creating the sheet metal component, you need toflatten it in order to find the strip layout. Based on this layout detail, you can design thepunch and die. Figure 15-2 shows the flattened view of the sheet metal component shown inFigure 15-1.

CATIA V5R17 allows you to create the sheet metal components in a separate environment called theGenerative Sheetmetal Design.

Starting a New File in Generative Sheetmetal WorkbenchTo start a new file in the Generative Sheetmetal workbench, choose Start > Mechanical Design >Generative Sheetmetal Design from the menu bar; theNew Partdialog box will be displayed. ChoosetheOKbutton; a new file will be started in the Generative Sheetmetal Design workbench. Figure 15-3shows the initial screen appearance of the Generative Sheetmetal Design workbench.

Tip. For the ease of locating and invoking tools, you can create customized toolbarsand add the tools that you often use in those customized toolbars. To do so, chooseTools > Customizefrom the menu bar; the Customize dialog box will be displayed.Choose the Toolbars tab and then theNew button; theNew Toolbardialog boxwill be displayed. Enter Generative Sheetmetal Design as the name of the toolbarin the Toolbar Name edit box and choose OK; the toolbar is added in the toolbarlist. Next, you need to customize the tools. Choose the Commands tabfrom theCustomize dialog box. From the Categories area, select theAll Commandsoption; all commands will be displayed in the Commands area of the Customizedialog box. Select the tool you want to add and drag it to the Generative SheetmetalDesign toolbar.

Figure 15-1 Sheet metal component Figure 15-2 Flattened view of the sheet metalcomponent

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Working with Sheet Metal Components 15-3

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SETTING SHEET METAL PARAMETERS

After invoking the Generative Sheetmetal Design environment, it is recommendedthat you first set the sheet metal parameters. To do so, choose the Sheet MetalParameters button from the Walls toolbar; the Sheet Metal Parameters dialog box

will be displayed, as shown in Figure 15-4. The parameters set in this dialog box will be usedfor all additional features. The options in the Sheet Metal Parameters dialog box are discussednext.

Parameters TabThe options in thistab are used to set the parameters related to the sheet thickness and bendradius. These options are discussed next.

ThicknessThe Thickness spinner is used to specify the sheet thickness. The value that you set in thisspinner will be displayed as the default value while creating the sheet metal part.

Figure 15-3 The initial screen appearance of the GenerativeSheetmetal Designmodule

Menu: Insert > Sheet Metal Parameters

Toolbar: Walls > Sheet Metal Parameters

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Default Bend RadiusThe Default Bend Radius spinner is used to set the radius of the bend. The default bend

radius is theinternal radius and is linked by default to the supporting walls of the sheetmetal part.

Bend Extremities TabWhenever you bend a sheet metal component or create a flange such that the bend does notextend throughout the length of the edge, a groove is added at the end of the bend so thatthe walls of the sheet metal part do not intersect when folded or unfolded. This groove isknown as relief.

Choose the Bend Extremities tab to define the type of relief, as shown in Figure 15-5. Selectan option from the drop-down list under this tab to define the relief type. Alternatively,choose the down arrow on the button available underneath; a flyout will be displayed withdifferent types of relief. Select the required relief from the flyout. The types of relief in

CATIA V5 are discussed next.

Minimum with no reliefThis option is selected by default, and it does not provide any relief to the commonarea between the supporting walls of the sheet metal part, refer to Figure 15-6.

Square reliefThis option provides a square relief between the supporting walls of the sheet metalpart, as shown in Figure 15-7. You can modify the L1 and L2 values in their respectivespinners.

Round reliefThis option provides a round relief between the supporting walls of the sheet metalpart, as shown in Figure 15-8. You can modify the L1 and L2 values in theirrespective spinners.

Figure 15-4 The Sheet Metal Parametersdialog box with theParameters tab selected

Figure 15-5 The Sheet Metal Parameters dialogbox with theBend Extremities tab selected

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Linear

TheLinear

optionprovides a linear relief between the supporting walls of thesheetmetal, as shown in Figure 15-9.

Tangent/Curved ShapeThe Tangent/CurvedShape option provides a curved relief between the supportingwalls of the sheetmetal, as shown in Figure 15-10.

Maximum BendOn selecting the Maximum Bend option, the bend is calculated between the extremeedges of two support walls, as shown in Figure 15-11.

Closed relief

The Closed reliefoption provides relief to the intersection between the bends of twosupporting walls.

Figure 15-7 Sheet metal with square reliefFigure 15-6 Sheet metal with no relief

Figure 15-9 Sheet metal with linear reliefFigure 15-8 Sheet metal with round relief

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NoteYou can also first draw the sketch of the base feature in the Sketcher workbench and then set theparameters in the Sheet Metal Parameters dialog box.

Bend Allowance TabThe option available in the Bend Allowance tab is discussed next.

K factorK factor is the ratio between the distance from the neutral bend line and the upper surface ofthe sheet metal part to the total thickness of the part.

Note

You can change the values of parameters in the Sheet Metal Parameters dialog box any timeduring the design.

The tools in this workbench will be available only after setting the parameters in the SheetMetal Parameters dialog box.

Figure 15-11 Sheet metal part with maximumbend relief

Figure 15-10 Sheet metal part with tangent/curve relief

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fordetailsMenu: Insert > Walls > Wall

Toolbar: Walls > Wall (Customize to Add)

INTRODUCTION TO SHEETMETAL WALLSA wall refers to any section in the sheetmetal design. There are two types of walls in CATIA V5and these are discussed next.

Creating the Base Wall

The first feature created while designing a sheetmetal part is called the base wall. The other featuresare added to this base wall. Remember that the

parameters of the base wall and the additional features willbe based on the parameters set earlier in the Sheet MetalParameters dialog box. The Wall tool is used to create the

base feature of the sheetmetal component. To create a wall,choose the Wall button from the Walls toolbar; the WallDefinition dialog box will be displayed, as shown inFigure 15-12. You can draw the sketch of the base featurebefore invoking the Wall tool. You can also use thesketching option provided in the Wall Definition dialogbox. The sketch of the base feature is shown in Figure 15-13.

If the sketch is already drawn, select it from the geometry area; the preview of the wall will bedisplayed. If the sketch is not drawn, choose the Sketcher button on the right of the Selectionarea in the Wall Definition dialog box; you will be prompted to select the sketching plane.Define the sketching plane and then draw the sketch. Exit the Sketcher workbench to redisplaythe Wall Definition dialog box. To flip the direction of the material, choose the Invert MaterialSide button. Choose the OKbutton to create the wall. Figure 15-14 shows the resulting wall.

Figure 15-13 The sketch of the base feature Figure 15-14 The resultant base feature

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Creating the Wall On Edge

The Wall On Edge tool is used to create a wall on the edges of an existing wall. Tocreate a wall on an edge, choose the Wall On Edge button from the Walls toolbar;the Wall On Edge Definition dialog box will be displayed, as shown in Figure 15-15.

There are two options in the Type drop-down list, Automatic and Sketch Based. Theseoptions are discussed next.

Automatic

TheAutomatic option lets you select an existing edge to create a wall. The options that willbe displayed on selecting theAutomatic option from the Type drop-down list are discussednext.

Height & Inclination Tab

By default, the Heightoptionis selected in the first drop-down list under the Height &Inclination tab. Set the value of the height inthe spinner.To define the height, click onthe down arrow available on the Length type button; a flyout will be displayed withfour options. These options are discussed next.

This option is used to specify the height of the flange from the start of the bend tothe extreme edge of the wall created.

This option allows you to specify the vertical distance from the upper face of the basewall to the extreme edge of the wall created.

This option allows you to specify the vertical distance from the lower face of the basewall to the extreme edge of the wall created.

Figure 15-15 The Wall On Edge Definition dialog box

Menu: Insert > Walls > Wall On Edge

Toolbar: Walls > Wall On Edge (Customize to Add)

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This option allows you to specify the slant distance from the extreme edge of thevertical wall to the apparent intersection of the vertical and horizontal wall.

If you need the wall on the edge to be created upto a pre-defined plane, select the Up toPlane/Surfaceoption from the first drop-down list and select the plane from the geometryarea or the specification tree. You can also create a new plane. To do so, right click in theUp to Plane/Surface selection area; the contextual menu will be displayed. Choose theCreate Plane option from the contextual menu and create a plane as discussed earlier.When you select the plane, the Offsetspinner will be available. You can use this spinnerto terminate the wall at a certain offset from the selected plane.

To create a wall at an angle with respect to the support wall, select theAngle option, if itis not already selected, in the seconddrop-down list and set the inclination in theAnglespinner.

If you need to create an inclined wall with respect to the existing face or plane, select theOrientation plane option from the second drop-down list. Select the plane as discussedearlier. If you need to change the inclination of the wall with respect to the selectedplane, set the angle in the Rotation angle spinner.

Clearance mode

The wall can be created at an offset from the selected edge by using the options in theClearance mode drop-down list.The options in this drop-down list are No Clearance,Monodirectional, and Bidirectional. On selecting the No Clearance option, the wallwill be created without clearance between the base wall and the side wall, as shown inFigure 15-16. When you select the Monodirectional option, the wall will be created withthe horizontal clearance, as shown in Figure 15-17. You need to set the value for thehorizontal clearance in the Clearance value spinner.

On selecting the Bidirectional option, the Feature Definition Warning message box willbe displayed. If you choose the Yes button, the Clearance value spinner will not beavailable and the clearance value will be the same as set for the bend radius in the Sheet

Figure 15-17 Side wall with the mono

directional clearance

Figure 15-16 Side wall with no clearance

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Metal Parameters dialog box. When you choose the No button from the message box,the Clearance value spinner will be available and you can change its value. The

Bidirectional option provides clearance in the horizontal and the vertical directions, asshown in Figure 15-18.

To change the direction of the wall on the edge, choose the Reverse Position buttonfrom the Wall On Edge Definition dialog box. To change the material side of the wall,choose the Invert Material Side button.

Extremities Tab

The options in the Extremities tabare used to define the length of the wall with respectto a reference plane/wall. The options and the procedure to set the limits are discussednext.

Left limit and Left offset

Select the predefined plane or the wall that you need to set as the left limit from thegeometry area; it will be displayed in the Leftlimitselection area. You can also create aplane as discussed earlier. Next, set the offset distance in the Left offsetspinner.

Right limit and Right offsetSelect the predefined plane or the wall that you need to set as the right limit from thegeometry area; it will be displayed in the Rightlimitselection area. You can also create aplane as discussed earlier. Next, set the offset distance in the Right offsetspinner.

With Bend

Select the With Bend check box, if it is not already selected, and the wall will be createdwith bend. To change the type of relief, choose the Bends parameters button on the

right side of the With Bend check box; the Bend Definition dialog box will be displayed.Here, you can change the type of relief as discussed earlier.

If you have selected the MonodirectionalClearance option,and the horizontal clearanceset is more than the bend radius, then the Extrapolation mode button will be available

Figure 15-18 Side wall with the bidirectional clearance

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Figure 15-20 Preview of the wall to be createdwhen the second option is selected from theExtrapolation mode flyout

Figure 15-19 Preview of the wall to be createdwhen the first option is selected from theExtrapolation mode flyout

next to the Bends parameters button. Click on the down arrow of the Extrapolationmode; a flyout will be displayed with two options. If you select the first option, the width

of the clearance will be equal to the width of the base feature, as shown in Figure 15-19.On selecting the second option, the width of the clearance will be equal to the width ofthe wall on edge feature, as shown in Figure 15-20 .

Choose the OKbutton; the resultant side wall will be created, as shown in Figure 15-21.

Sketch BasedSelect the Sketch Based option in the Type drop-down list; the Wall On Edge Definitiondialog box will be displayed, as shown in Figure 15-22. The options in this dialog box arediscussed next.

Figure 15-22 The Wall On EdgeDefinitiondialog box with the Sketch Basedoption selected

Figure 15-21 Wall created by selectingtheAutomatic option

Tip.On choosing the Swap limits symbol displayed on the left side of the spinners, the values and limits on the left and right side of the wall will getinterchanged.

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Profile

Select edge of the base wall feature on which you need to create the wall on edge feature.

Next, select the sketcher icon on the right side of the Profile selection area; you will beprompted to select the sketch plane. Select the face adjacent to the selected edge. Thisface will act as the sketching plane of the wall feature. Create a closed sketch.

Rotation angle

You can also create a wall inclined at an angle to the selected edge. To do so, set theangular value in the Rotation angle spinner. The default value in the Rotation anglespinner is 90deg.

The other options have been discussed earlier. Next, choose the OKbutton; the resultantside wall will be created, as shown in Figure 15-23.

Note

If you have created the wall without bend, create the bend later using theBendtool. This toolwill be discussed later in this chapter.

CREATING EXTRUSIONS

The Extrusion tool is used to extrude an open sketchdrawn on an existing wall. To extrudethe sketch, invoke the Extrusion tool from the Walls toolbar; the Extrusion Definitiondialog box will be displayed, as shown in Figure 15-24. Create a sketch on the base wall, as

shown in Figure 15-25.

Next, you will be prompted to select the profile. Select the sketch to be extruded from the geometryarea. You can also create a profile by selecting the sketchericonat the right of the Selection selectionarea.

By default, the First Limittab is selected and the options in this tab are used to create the wall normal

Menu: Insert > Walls > Extrusion

Toolbar: Walls > Extrusion (Customize to Add)

Figure 15-23 Wall created by selecting theSketch Basedoption

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Figure 15-24 TheExtrusion Definition dialog box

to the support wall. Select the Dimension option from the Type drop-down list, if you need the sketchto be extruded to a specified length. Set the length in the Length 1 spinner. To extrude the sketchupto a selected plane or surface, select the Up to Plane or Up to surface option from the Typedrop-down list. Next, select the plane or surface from the geometry area.

Choose the Second Limittab if you need the wall to be extruded on the other side of the support wall.Set the parameters as discussed in the First Limittab.

To mirror the extruded feature, select the Mirrored Extentcheck box. If you select the SymmetricalThickness check box, the profile plane will be treated as a neutral plane and the material willbe extruded on either side of the profile. To change the direction of the material, choose the InvertMaterial Side button. Next, choose the Previewbutton to preview the feature. The resulting extruded

wall is shown in Figure 15-26.

Note

You need to create the bend after extruding the profile. This topic will be discussed later in thischapter.

Figure 15-26 Final feature of the extrusion wallFigure 15-25 Preview of the extrusion wall

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Figure 15-27 TheFlange Definition dialog box

CREATING SWEPT WALLS

Swept walls are created by sweeping a profile along the selected edge. The differenttypes of swept walls are Flange, Hem, Tear Drop, and User Flange swept walls.These walls are discussed next.

Creating Flanges on the Sheet Metal ComponentFlange is the bend section of the sheetmetal. To create a flange feature, invoke the Flangetool from the Swept Walls toolbar; the Flange Definition dialog box will be displayed, asshown in Figure 15-27. The options in this dialog box are discussed next.

Flange typeThere are two options in the Flange type drop-down listand these are discussed next.

BasicThis option is selected by default and in this case, the width of the flange created will beequal to the width of the selected edge. The options available when you select the Basicoption are discussed next.

Length

Set the length of the wall in the Length spinner. To change the length type of the flange,choose the down arrow on the right side of the Length type button; a flyout will bedisplayed with four options. The options in the flyout have been discussed earlier.

Menu:Insert > Walls > Swept Walls > Flange

Toolbar: Swept Walls > Flange

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Figure 15-28 Flange created with theTrim Support check box cleared

Figure 15-29 Flange created with the TrimSupport check box selected

Angle

You can also create a flange wall inclined at an angle to the selected edge. To do so, set

the angular value in theAngle spinner.To change the angle type of the flange, choosethe down arrow on the right side of theAngle type button; a flyout will be displayed withtwo options. If you select the first option, the angle that you define will be considered asthe included angle from the face. In case of the second option, the angle you define willbe considered as the excluded angle.

Radius

Set the bend radius of the flange in the Radius spinner.

Spine

Select an edge from the existing wall; the selected entity will be displayed in the Spineselection area. To remove the selected entity from the Spine edit box, choose the Remove

All button.

Trim Support

By default, this check box is not selected. So, the flange will be created outward from theedge selected, as shown in Figure 15-28. When you select the Trim Supportcheck box,the flange will be created inward from the selected edge at a distance equal to the radiusof the flange, as shown in Figure 15-29. Also, the portion of the wall beyond the radiuswill be trimmed.

Choose the Propagate button to select the edges that are connected tangentially. Choosethe Invert Material Side button to change the material side of the flange. The Invert

Material Side button will be available when the Trim Supportcheck box is selected.

RelimitedTo create the flange up to a specified limit, select the Relimited option from the Flange typedrop-down list. On selecting this option, you need to define the limits in the Limit 1 and theLimit 2 selection area. You can select the predefined limits from the geometry area or create

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Menu: Insert > Walls > Swept Walls > Hem

Toolbar: Swept Walls > Hem

the new one by right-clicking in the Limit 1 and Limit 2 selection area as discussed earlier.The rest of the options are the same as discussed in the Basic option. Figure 15-30 shows the

flange feature created by selecting the Basic option. Figure 15-31 shows the flange featurecreated by selecting the Relimited option.

Creating Hems on the Sheet Metal Component

Hem is the rounded face created on the sharp edges of the sheet metal componentin order to reduce the sharpness in a sheet metal component. This makes the sheetmetal component easy to handle and assemble. To create hems, invoke the Hem tool

from the Swept Walls toolbar; the Hem Definition dialog box will be displayed, as shown

in Figure 15-32. The options in the Hem Definition dialog box are discussed next.

By default, the Basic option is selected in the Flange type drop-down list, so the width of the

Figure 15-31 The flange feature created byselecting theRelimitedoption

Figure 15-30 The flange feature created byselecting theBasic option

Figure 15-32 TheHem Definitiondialog box

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hem created will be equal to the width of the selected edge. On selecting the Relimitedoption from the Flange type drop-down list, you need to select the limits from the geometry

area. Next, you need to set the lengthand radius of the hem in their respective spinners.

Select the edge, also known as the guide element, on which you need to create the hem.The selected guide element will be displayed in the Spine selection area. To remove theselected guide element, choose the Remove All button.

To select the edges that are connected tangentially, choose the Propagate button. To changethe material side of the flange, choose the Reverse Direction button. Choose the OKbuttonto create the final feature. Figure 15-33 shows the Hem on a side wall.

Creating a Tear Drop on the Sheet Metal Component

A tear drop is similar to a hem but in this case, the flat wall is inclined at an angle.Invoke the Tear Drop tool from the Swept Walls toolbar; the Tear Drop Definition dialogbox will be displayed, as shown in Figure 15-34. The options in the Tear Drop Definition

dialog box are discussed next.

By default, the Basicoption is selected in the Flange type drop-down list, so the width of the tear dropfeature created will be equal to the width of the selected edge. On selecting the Relimitedoption fromtheFlange type drop-down list, you need to select the limits from the geometry area. Next, you needto set the lengthof the flat wall and radius of the tear drop in their respective spinners.

Select the edge on which you need to create the hem. The selected edge will be displayed in the Spine

selection area. To remove the selected edge, choose the Remove All button.

To select the edges that are connected tangentially, choose the Propagate button. To change thematerial side of the flange, choose theReverse Direction button. Choose the OKbutton to create thefinal feature. Figure 15-35 shows thetear dropfeature created on a side wall.

Menu: Insert > Walls > Swept Walls > Tear Drop

Toolbar: Swept Walls > Tear Drop

Figure 15-33 Hem on the side wall

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Creating a User Flange on the Sheet Metal Component

User flanges are created by sweeping an open sketch along an edge. Choose the UserFlange button from the Swept Walls toolbar; the User-Defined Flange Definitiondialog box will be displayed, as shown in Figure 15-36. The options in this dialog box

are discussed next.

By default, the Basic option is selected in the Flange type drop-down list, so the width of theflange created will be equal to the width of the selected edge. On selecting the Relimitedoption from the Flange type drop-down list, you need to select the limits from the geometryarea. Next, select the profile from the geometry area; the selected profile will be displayed in

the Profile selection area. Note that the profile must be tangent to the supporting wall. Next,select an edge along which the profile has to be swept. To remove the selected edge from theSpine selection area, choose the Remove All button. To select the edges that are connectedtangentially, choose the Propagate button. Choose the OKbutton to create the feature.

Figure 15-36 The User-Defined Flange Definition dialog box

Menu: Insert > Walls > Swept Walls > User Flange

Toolbar: Swept Walls > User Flange

Figure 15-35 Wall with a tear dropFigure 15-34 The Tear Drop Definition dialog box

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Menu: Insert > Bending > Bend

Toolbar: Bending > Bend

Figure 15-38 The resulting user

flange feature

Figure 15-37 The edge and the

profile to be selected

Figure 15-37 shows the profile and the edge selected for creating the user flangeand Figure 15-38 shows the resulting user flange feature.

CREATING A BEND

This tool is used to create a bent face between the two walls at intersection. Tocreate a bent face, choose the Bend tool from the Bending toolbar; the BendDefinition dialog box will be displayed. The procedure to create a bend and the

options in the Bend Definition dialog box are discussed next.

Select the two walls in succession from the geometry area; the selected walls will be displayedin the Support 1 and Support 2 selection area. The bend radius set in the Sheet MetalParameters dialog box will be displayed as the default value in the Radius spinner of theBend Definition dialog box.

To change the relief provided to the bend, choose the More button; the Bend Definitiondialog box will get expanded, as shown in Figure 15-39. The Left Extremity tab is selected bydefault. The options in this tab are used to provide relief to the left side of the wall. Select thedown arrow on the Select the extremity type button; a flyout will be displayed with variousrelief options. Select the type of relief from the options in the flyout. Next, choose theRight Extremity tab and select the type of relief to be provided on the right side of the wall.

Choose the Preview button to preview the feature, as shown in Figure 15-40. Choose the OKbutton; the final bend feature will be created. as shown in Figure 15-41.

Tip.You can create a bend even if the two support walls are not intersecting,provided the distance between the two walls is equal to or less than the default bendradius set in the Sheet Metal Parameters dialog box.

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Creating A Conical Bend

The Conical Bend tool is used to create a bend of variable radius at the intersectionof two walls. The bend created using this tool will have a conical shape and a varyingradii from the left to the right of the wall, or vice-versa. To create a conical bent face,

choose the Conical Bend buttonfrom the Bending toolbar; the Bend Definition dialog boxwill be displayed, as shown in Figure 15-42.

Choose two support walls in succession from the geometry area; the selected walls willbe displayed in the Support 1 and Support 2 selection area. Set the radius values in the Leftradius and the Right radius spinners, respectively. To add or modify relief in the bend,choose the More button; the Bend Definition dialog box will be expanded. The Left Extremitytab is selected by default. Now, select the type of relief from the flyout of the Select theextremitytype button. Next, choose the Right Extremity tab and select the type of relief for

the right side of the wall.

You can see the preview of the sheet metal feature by choosing the Preview button from theBend Definition dialog box, as shown in Figure 15-43. Choose the OKbutton; the conicalbend feature will be created, as shown in Figure 15-44.

Menu: Insert > Bending > Conical bend

Toolbar: Bending > Bend > Conical Bend

Figure 15-41 The resulting bend featureFigure 15-40 Preview of the bend feature

Figure 15-39 TheBend Definition dialog box in expanded form

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Figure 15-44 Resulting conical bend featureFigure 15-43 Preview of the conical bend feature

BEND FROM FLAT

CATIA V5 allows you to bend a part of the sheet metal component by using the BendFrom Flat tool. Remember that the sheet metal part will be folded along thenoncontinuous lines. Choose the Bend From Flatbutton from the Bending toolbar;

the Bend From Flat Definition dialog box will be displayed, as shown in Figure15-45. Theoptions in the Bend From Flat Definition dialog box are discussed next.

ProfileSelect the sketch from the geometry area and it will be displayed in the Profile selection area.The selected sketch can contain more than a line, but these should be noncontinuous ones.You can also create the profile by using the sketcher icon in the Bend From Flat Definitiondialog box.

Figure 15-42 TheBend Definition dialog box

Menu: Insert > Bending > Bend From Flat

Toolbar: Bending > Bend From Flat

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LinesIf the selected profile has more than a line, then all lines will be listed in the Lines drop-downlist. Select the line along which you need to create the bend from the Lines drop-down list.Next, select the down arrow on the button at the right of the Lines drop-down list; a flyoutwill be displayed with four options. The options in the flyout are discussed next.

AxisWhen you choose this button, the bend line will be placed at the centre of the bendand the bend will be created equally in both the directions of the bend line, as shownin Figure 15-46.

BTL (Bent Tangent Line)When you choose this button, the bend line will be placed at the start of the bend, as


IML (Inner Mold Line)When you choose this button, the bend line will be placed at the apparent intersectionof the inner surface of both the horizontal and vertical walls, as shown in Figure 15-48.

OML (Outer Mold Line)When you choose this button, the bend line will be placed at the apparent intersectionof the outer surface of both the horizontal and vertical walls, as shown in Figure 15-49.

Figure 15-45 TheBend From Flat Definition dialog box

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Figure 15-46 Bend created using theAxis option

Figure 15-48 Bend created using theInnerMold Line option

Fixed Point

Once you select the sketch, the fixed point is automatically set on the face where the sketch ispositioned. This means that no portion of the wall will move when the bend is created. You canchange the fixed point by selecting another point on the wall. The fixed point is generally thestart point of the sketch. To create a new fixed point, right click on the Fixed Pointselectionarea, select the Create Pointoption, and define a point.

RadiusBy default, the value of the bend radius is the value that was set earlier in the Sheet MetalParameters dialog box. You can also change the radius value in the Radius spinner.

AngleTheAngle spinneris used to set the angle of the fold for the sheet metal component. The

default value in this edit box is 90-degrees. You can set a value less than 180-degrees in thisspinner. Figure 15-50 shows the sheet metal part folded by an angle of 60-degrees. To reversethe bending direction, click on the blue colored arrow in the preview. Choose the OKbuttonfrom the Bend From Flat Definition dialog box.

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Menu: Insert > Bending > Unfolding

Toolbar: Bending > Unfolding

FOLDING AND UNFOLDING SHEET METAL PARTS

Sometimes you need to perform operations like cutout, hole, and so on across the bend face ofthe wall, refer to Figure 15-51. You cannot create these features in the bend condition. So, youneed to unfold the sheet metal part, add the features, and again fold it. The folding andunfolding operations can be carried out using the tools in the Bending toolbar. These toolsare discussed next.

Unfolding the Sheet Metal Parts

TheUnfoldingtool is used to unfold a bend face of the sheet metal part. Choose the Unfoldingbutton from the Bending toolbar; the Unfolding Definition dialog box will be displayed, as


You will be prompted to select a reference face. Select a wall from the geometry area; it will be displayed intheReference Face selection area. Next, you will be prompted to select a face to unfold. If you need tounfold a particular bend, select the same from the drawing area, refer to Figure 15-53. To unfold all the

Figure 15-51 Cut feature created across the bend face

Figure 15-50 Sheet metal part after foldingit through an angle of 60-degrees

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Figure 15-54 The unfolded partFigure 15-53 TheReference Face and theUnfold Face to be selected

bends, choose theSelect All button. Choose theUnselectbutton to clear the bends selected. Next,choose the OKbutton to unfold the part, as shown in Figure 15-54.

Folding the Unfolded Parts

The Folding tool is used to fold the wall back to its original position that were unfoldedusing the Unfolding tool. Choose the Folding button from the Bending toolbar; theFolding Definition dialog box will be displayed, as shown in Figure 15-55. You need to

select a face as the reference wall; it will be displayed in the ReferenceFace selection area. Next,select the bend section; it will be displayed in the Fold Faces drop-down list. TheAngle spinneris used to specify the angle upto which the unfolded wall has to be folded. By default, theangular value will be the difference between 180 degrees and the bend angle of the original part.Select an option from theAngle type drop-down list to specify the angle type of the resultingfolded part. The options in theAngle type drop-down list are discussed next.

Menu: Insert > Bending > Folding

Toolbar: Bending > Folding

Figure 15-52 The Unfolding Definitiondialog box

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Figure 15-57 Resulting feature of the folded partFigure 15-56 Preview of the folded part

Natural

By default, this option is selected and the wall will be folded back to its original position.So, the Angle spinner will not be available.

DefinedSelect this option if you need to fold the wall to an angle other than its original position.Specify the angle in theAngle spinner.

Spring back

Select this option if you need to fold the wall at an angle with respect to its originalposition. Specify the angle in theAngle spinner.

By choosing the Select All button, you can select all unfold walls. By choosing the Unselectbutton, you can unselect the selected unfold walls. Choose the Preview button; the preview ofthe feature will be displayed, shown in Figure 15-56. Next, choose the OKbutton to create thefinal feature, as shown in Figure 15-57.

Note

After performing the required operation, if you want to fold the component, choose the Select Allbutton from theFolding Definition dialog box.

Figure 15-55 TheFolding Definitiondialog box

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CREATING FLAT PATTERNS OF SHEET METAL

COMPONENTS

The flattened view of a sheet metal component plays a very important role during themanufacturing stage. While designing the tools for creating the sheet metal component,you need to flatten the sheet metal component.

Choose the Unfold/Fold tool to view the unfolded sheet metal components. As this is a toggletool, you can choose it again to fold the sheet metal components back. Note that you cannotmake any modifications in the unfolded sheet metal component. Figure 15-58 shows a sheetmetal component and Figure 15-59 shows the flat pattern of the same component.

Note

You can create holes, fillets, and chamfers features using the tools in the Cutting/Stampingtoolbar. The procedure to create these features is similar to that you used in part modeling.

STAMPINGStamping is a metal working process in which a sheet is punched in a press tool. This processis used to create stamping features such as blanking, piercing, and forming on the sheetmetal part. CATIA V5 provides a set of tools to design a sheet metal part that can be createdby the stamping process. These tools are grouped in the Stamping toolbar. These tools arediscussed next. Figure 15-60 shows the stamping toolbar.

Menu: Insert > Views > Unfold/Fold

Toolbar: Views > Unfold/Fold

Figure 15-59 Flat pattern of the sheet metalpart

Figure 15-58 Sheet metal part

Tip.You can dislodge the Stampingtoolbar from the flyout displayed by clickingon the down arrow available on the right side of the Surface Stamp tool.

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Creating Surface Stamp

To create a surface stamp feature, you need to create a close sketch on a wall, as shown inFigure 15-61. Next, choose the Surface Stamp button from the Stamping toolbar; theSurface Stamp Definition dialog box will be displayed, as shown in Figure 15-62. Select

the profile from the geometry area, if it is not already selected; it will be displayed in the Profileselection area. The other options in the Surface Stamp Definition dialog box are discussednext.

Definition Type AreaThe options in the Definition Type area are discussed next.

Parameters choice

The three options available in the Parameters choice drop-down list are the Angle,Punch and Die, and Two profiles. By default, the Angle option is selected in theParameters choice drop-down list.

Half pierce

On selecting this check box, the stamp will be created such that its height will be half of

Menu: Insert > Stamping > Surface Stamp

Toolbar: Stamping > Surface Stamp

Figure 15-61 Sketch of surface stamp feature

Figure 15-60 The Stampingtoolbar

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the thickness of the sheet metal. If you select this check box, the Angle A, Radius R1,Radius R2, Rounded die, and Opening Edges options will not be available in the dialogbox.

PPPPParameters AreaWhen theAngle option is selected in the Parameters choice drop-down list, the followingoptions are available in the Parameters area:

Angle A

Set the angular value of the stamp feature in this spinner. The angle will be providedbetween the wall of the surface stamp and the face where the profile is drawn. The defaultvalue in theAngle spinner is 90deg.

Height H

The height of the stamp feature is specified in the HeightH spinner. Note that this spinnerwill not be available if you specify the height using the Limitoption.

Limit

You can also specify the height of the stamp feature by specifying the limits. The limitsspecified can be a surface or plane. To create a plane, right click in the Limitselectionarea and then select the Create Plane option from the contextual menu.

Figure 15-62 The Surface Stamp Definition dialog box

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Figure 15-64 Stamp feature with sideedges filleted

Figure 15-63 Stamp feature without sideedges filleted

Radius R1, Radius R2, and Rounded Die

Select the Radius R1 and Radius R2 check boxes to create the fillets at the top and bottom

surface of the stamp respectively, as shown in Figure 15-63. Set the fillet radii in the RadiusR1 and Radius R2 spinners. If you select the Rounded die check box, the side edges ofthe stamp feature will be filleted. Figure 15-63 shows the surface stamp feature with theRounded die check box cleared. Figure 15-64 shows the surface stamp feature with theRounded die check box selected.

Type buttons

When you choose the first button in this area, the dimensions of the top face of the stampfeature will be equal to the sketch selected initially, as shown in Figure 15-65. On choosingthe second button, the dimensions of the bottom of the stamp feature will be equal to thesketch selected initially, as shown in Figure 15-66.

Opening Edges

You can also create a stamp feature with open walls. To do so, click in the Opening Edgesarea, select a profile from the sketch; the wall relative to the selected profile will not be

created. Figure 15-67 shows the stamp feature with an open edge. To see the preview of thestamp, choose the Preview button. Choose the OKbutton from the Surface Stamp Definitiondialog box; the stamp feature will be created, as shown in Figure 15-68.

Figure 15-66 Type 2Figure 15-65 Type 1

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Creating Bead Stamp

The Bead tool is used to create an embossed or an engraved bead on a sheet metal partusing an open sketch. If the sketch has multiple continuous entities, they should betangentially connected. Else, you will get an error message. Choose the Bead button;

the Bead Definition dialog box will be displayed, as shown in Figure 15-69.

You will be prompted to select the profile. Select it from the geometry area. Next, set the valuesof the section radius and end radiusin their respective spinners. Note that the end radiusshould be greater than the section radius. Set the height of the stamp in the Height H spinner.

Various parameters of the bead feature are shown in Figure 15-70. If you do not select theRadius Rcheck box, the resulting stamp feature will be created without a fillet, as shown inFigure 15-71. You can change the direction of the bead by clicking on the orange pointer in thegeometry area. To see the preview of the feature, choose the Preview button. Next, choose theOKbutton; the stamping feature will be created.

Menu: Insert > Stamping > Bead

Toolbar: Stamping > Bead

Figure 15-69 TheBead Definition dialog box

Figure 15-67 The stamp feature with the openwalls

Figure 15-68 The Surface Stampfeature

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Creating Curve Stamp

To create a curve stamp feature, you need to create an open or a closed profile on thewall of sheet metal component, as shown in Figure 15-72. Next, choose the CurveStamp button from the Stamping toolbar; the Curve stamp definition dialog box will

be displayed, as shown in Figure 15-73. The options in the Curve stamp definition dialog boxare discussed next.

Definition Type AreaThe options in this area are discussed next.

Obround

By selecting the Obround check box, you can round-off the end of the edges of the curvestamp shown in Figure 15-74. Figure 15-75 shows the curve stamp feature with the

Obround check box cleared.

Half pierce

On selecting this check box, the stamp feature will be created such that the height of thestamp feature will be half of the sheet metal.

Menu: Insert > Stamping > Curve Stamp

Toolbar: Stamping > Curve Stamp

Figure 15-70 Parameters of bead feature Figure 15-71 Stamp feature without fillet

Figure 15-72 Sketch of a curve stamp

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ProfileIf the sketch is already drawn, select it from the geometry area; the preview of the curve stamp

will be displayed. If the sketch is not drawn, choose the sketcher icon on the right of the ProfileSelection area, select the surface of the base feature, and create a sketch.

To see the preview of the stamp feature, choose the Preview button. Choose the OKbutton tocreate a curve stamp feature.

Creating Louver Stamp

Louvers are created in a sheet metal part to provide openings for the purpose ofventilation. Generally, a rectangular pattern of louvers will be created on the top face of

a cover. To create a louver stamp feature, you need to create a close sketch on the basefeature. Next, choose the Louver button from the Stamping toolbar; the Louver Definitiondialog box will be displayed, as shown in Figure 15-76.

Select the sketch from the geometry area, if it is not already selected. Next, set the height of thelouver in the Height H spinner. If you need to create the side walls of the louver at an angle tothe face on which it is placed, set the angular value in theAngle A1 spinner. By default, theangular value will be 0deg. The angle between the top face of the louver and the plane where the

opening is provided is specified in theAngle A2 spinner. By default, its value will be 90deg.Next, specify the opening edge of the louver from the sketch. The selected entity will be displayedin the Opening line selection area. Next, choose OKto create the louver feature. Figure 15-77shows the sketch to create the louver feature and Figure 15-78 shows the resulting feature.

Figure 15-76 TheLouver Definition dialog box

Menu: Insert > Stamping > Louver

Toolbar: Stamping > Louver

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Creating Flanged Cut Out Stamp

To create a flanged cut out stamp, create a closed profile on a wall, choose the FlangeCut Outbutton from the Stamping toolbar; the Flanged cutout Definition dialog box

will be displayed, as shown in Figure 15-79.

You will be prompted to select the profile. Select the closed profile from the geometry area, if itis not already selected, as shown in Figure 15-80. Set the height of the flange cutout feature inthe Height H spinner. The height is specified normal to the face on the which the sketch isdrawn. Next, set the anglein theAngle Aspinner. If you select the RadiusRcheck box, theedges of the profile get filleted. You can set the fillet radius in the Radius Rspinner. Choose thePreview button; the preview of the flange cutout stamp will be displayed. Choose the OKbutton; the flanged cut out feature will be created, as shown in Figure 15-81.

Figure 15-77 Sketch for the louver feature Figure 15-78 The louver feature

Menu: Insert > Stamping > Flange Cut Out

Toolbar: Stamping > Flange Cut Out

Figure 15-79 TheFlanged cutout Definitiondialog box

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Creating Flanged Hole

To create a flanged hole, you need to create a point on a wall. Then select the point andthe surface on which the hole has to be created. Next, choose the Flanged Hole buttonfrom the Stamping toolbar; the Flanged Hole Definition dialog box will be displayed,

as shown in Figure 15-82.

You will notice that the Major Diameter option is selected by default in the Parameters choicedrop-down list under the Definition Type area. Next, you need to set the values for the heightof the flanged hole, fillet radius, angle of the flanged hole, and the diameter of the flangedhole

Figure 15-81 The flanged cutout feature

Menu: Insert > Stamping > Flanged HoleToolbar: Stamping > Flanged Hole

Figure 15-82 TheFlanged Hole Definition dialog box

Figure 15-80 Sketch of the flanged cutout feature

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Figure 15-85 Dimensioned sketch point

in the Height H, Radius R,Angle Aand Diameter D spinners, respectively. The location ofthe flanged hole will be indicated by the pointer you place on the surface. If you do not want a

protruded hole, select the Without cone radio button in the Definition Type area. Figure 15-83shows the point placed on a wall. Figure 15-84 shows the flanged hole created with the Withcone radio button selected.

Creating Bridge Feature

The Bridge tool is used to create the features used for the purpose of holding andgriping. To create a bridge feature, you need to create a point on the base wall, as shownin the Figure 15-85. Select the point and the surface on which the Bridge feature has to

created. Next, choose the Bridge button from the Stamping toolbar; the Bridge Definition dialog

box will be displayed, as shown in Figure 15-86.

Parameters areaThe options in the Parameters Area are discussed next.

Figure 15-83Dimensioned sketch point Figure 15-84 Flanged hole feature with theWith cone radio button selected

Menu: Insert > Stamping >Bridge

Toolbar: Stamping > Bridge

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Height H and Length L

Set the height and length of the bridge in the Height H and Length L spinners, respectively.

Width W

Set the value for the width of the bridge in the Width W spinner.

Angle A

If you need the walls of the bridge at an angle, set the value in the Angle Aspinner.

Radius R1 and Radius R2Set the values of the outer bend radius and inner bend radius of the bridge in the RadiusR1 and Radius R2 spinners, respectively.

Angular reference

Select the angular reference about which the bridge rotates from the geometry area.

Orientation Angle

If you need the bridge feature to be created at an angle with respect to the horizontal plane,set the value in the Orientation Angle spinner. Figure 15-87 shows the bridge at an angle of90-degrees and Figure 15-88 shows the bridge at 45-degrees.

Relieves area

There are three options in the Relieves area. They are discussed next.

Figure 15-86 TheBridge Definition dialog box

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Figure 15-88 Bridge at an angle of 45-degreesFigure 15-87 Bridge at an angle of 90-degrees

If you select the None radio button, the bridge will not have any relief. If you need a squarerelief, select the Square radio button; the L1 and L2 spinners will be highlighted. Set the

limits in the L1 and L2 spinners, respectively. You can create a round relief by selecting theRound radio button.

You can change the direction of the material by clicking the orange pointer in the geometryarea. Choose the OKbutton to create the bridge stamp.

TUTORIALS

In this tutorial, you will create the sheet metal component of the Holder Clip shown inFigure 15-89. The flat pattern of the component is shown in Figure 15-91. Its dimensions areshown in Figures 15-90 and 15-92. The thickness of the sheet is 1 mm. After creating the sheetmetal component, create its flat pattern. (Expected time: 45 min)

The following steps are required to complete this tutorial:

a. Start a new metric sheet metal file and then draw the sketch of the top face of the sheetmetal component.

b. Set the parameters in the Sheet Metal Parameters dialog box and convert the sketch intoa sheet metal face.

c. Add the flange on the right and the left faces of the top feature.d. Add the flange on the front face of the feature.e. Create a cut feature on the front face of the new flange and then add another face and

chamfer to it.f. Create the last flange and then create the hole. Finally, create the flat pattern.g. Save the sheet metal component.

Tutorial 1

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Starting a New Part File1. To start a new file in the Generative Sheetmetal Design workbench, choose Start >

MechanicalDesign> Generative Sheetmetal Design from the menu bar. Choose theOKbutton in the New Partdialog box displayed; a new file gets started in the GenerativeSheetmetalDesign workbench.

Setting the Values in the Sheet Metal Parameters Dialog Box1. Choose the Sheet Metal Parameters button from the Walls toolbar; the Sheet

Metal Parameters dialog box is displayed.

2. Set 1mm in the Thickness spinner and 2mm in the Default Bend Radius spinner of theSheet Metal Parameters dialog box.Choose the OKbutton.

Figure 15-92Frontview of the Holder ClipFigure 15-91 Flat pattern of the component

Figure 15-90 Top view of the Holder ClipFigure 15-89 Sheet metal model of the Holder Clip

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Drawing the Sketch for the Top Face1. Invoke the Sketcher workbench by selecting the xy plane as the sketching plane and draw

the sketch for the base wall, as shown in Figure 15-93.

2. Exit the Sketcher workbench.

Converting the Sketch into a Base wall1. Choose the Wall button from the Walls toolbar; the Wall Definition dialog box is

displayed.

2. Select the sketch from the geometry area, if it is not already displayed in the Selectionselection area in the Profile area. Also, the preview of the base feature is displayed.

3. Choose the OKbutton to get the final feature of the base wall, as shown in Figure 15-94.

Creating the Flanges1. Choose the Flange button from the Walls toolbar; the Flange Definition dialog

box is displayed.

2. Select the edge on which you need to create the flange, as shown in Figure 15-95; it isdisplayed in the Spine selection area.

3. Next, select theBasic option in the Flange type drop-down list, if it is not already selected.

4. Set the value 41mm in the Length spinner. Choose the down arrow on the Lengthtype button; a flyout is displayed. Choose the third button in the flyout.

5. Set 90deg in theAngle spinner and 2mm in the Radius spinner. Choose the ReverseDirectionbutton, if required.

6. Accept the remaining default options and choose the OKbutton to create the flange.Figure 15-96 shows the resultant flange.

Figure 15-93 Sketch for the base wall of theHolder Clip

Figure 15-94 Base wall of the Holder Clip

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Figure 15-95 Selecting the edge for creatingthe flange

Figure 15-96 Sheet metal component aftercreating the flange

7. Create another flange of 41 mm length on the other edge, as shown in Figure 15-97. For

creating the flange, follow the same procedure as explained in the previous steps. Choosethe Reverse Direction button, if required.

Creating Other Flanges1. Choose the Flange button from the Walls toolbar; the Flange

Definition dialog box is displayed.

2. Set the value 19mm in the Length spinner, 90deg in theAngle spinner, and 2mm in theRadius spinner.

3. Select the edge of the base wall, as shown in Figure 15-98.

4. Accept the remaining default options and choose the OKbutton to create the flange. Thesheet metal component after creating the flange is shown in Figure 15-99.

5. Similarly, create another flange of 31mm length on the edge, as shown in Figure 15-100.

Figure 15-97 Sheet metal component aftercreating the flanges

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Creating a Wall on the Edge

1. Choose the Wall On Edge button from the Walls toolbar; the Wall On EdgeDefinition dialog box is displayed. Select the Sketch Based option from theType drop-down list.

2. Select the lower edge of the base wall, as shown in Figure 15-101.

3. Choose the Sketcher button on the right side of the Profile selection area; you are promptedto select the sketch plane.

4. Select the surface representing the thickness of the base wall. Draw the sketch of the wall,as shown in Figure 15-102.


6. Accept the remaining default options and choose the OKbutton to create the wall on theedge. Figure 15-103 shows the resultant wall on the edge.

Figure 15-101 Selecting the lower edge tocreate the wall on the edge

Figure 15-100 Sheet metal component aftercreating the wall on the edge and flange

Figure 15-99 Sheet metal component aftercreating the flange

Figure 15-98 Selecting the edge for creatingthe flange

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Figure 15-103 Sheet metal component aftercreating the wall on the edge

Figure 15-102 Sketch of the wall on the edgefeature

Creating Other Flanges1. Choose the Flange button from the toolbar; the FlangeDefinition dialog box is displayed.

2. Set the value 19mm in the Length spinner, 90deg in theAngle spinner, and 2mm in theRadius spinner. Select the edge of the base wall, as shown in Figure 15-104.

3. Accept the remaining default options and choose the OKbutton to create the flange. Thesheet metal component after creating the flange is shown in Figure 15-105.

4. Similarly, create another flange of 31mm length on the edge, refer to Figure 15-105.

Creating the Remaining Feature

1. Create the holes using theCut Outtool from the Cutting/Stamping toolbar.

2. Create the fillets by using the Corner tool.

3. Invoke the Chamfer tool and create the chamfers on the walls. Figure 15-106 showsthe sheet metal component after creating the holes, fillets, and chamfer.

Figure 15-105 Flange on the wall on theedge

Figure 15-104 Flange on the front face of thetop wall

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This completes the sheet metal component of the Holder Clip. The final sheet metalcomponent of the Holder Clip is shown in Figure 15-106.

Creating the Flat Pattern1. Choose the Fold/Unfold button from theViews toolbar;theflattened view of the

sheet metal partis created, as shown in Figure 15-107.

2. Save the sheet metal component with the name c15tut1.

In this tutorial, you will create the sheet metal component shown in Figure 15-108. Its dimensionsare given in Figures 15-109 through 15-111. The flat pattern of the component is shown inFigure 15-112. The thickness of the sheet is 1 mm. The length of the hem on the two faces is 5mm and its radius is 3 mm. (Expected time: 45 min)

Following steps are required to complete this tutorial:

a. Start a new file in Generative SheetmetalDesignworkbench.b. Draw the sketch and convert it into a base wall by using theWall tool, refer to Figure 15-113.c. Create one hole and then pattern it to create the remaining three instances, refer to

Figure 15- 114.d. Create the flange on the left and right edges of the base wall, refer to Figure 15-116.e. Create hems on the two flanges and then create the two keyways by using the cutout tool,

refer to Figure 15-117 and 15-118.f. Create the wall on the edge on the front face of the base, refer to Figure 15-119.g. Create the flat pattern, refer to Figure 15-120.

h. Save the model.

Figure 15-106 Final model of the Holder Figure 15-107 Flat Pattern of the Holder

Tutorial 2

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Starting a New File and Setting the Sheetmetal Part Parameters1. Choose New from the File option in the menu bar and start a new file in the Generative

Sheetmetal Design workbench.

2. Choose the Sheet Metal Parameters button from the Walls toolbar; the SheetMetalParameters dialog box is displayed.

Figure 15-111 Front view of the modelFigure 15-110 Left-side view of the model

Figure 15-109 Top view of the modelFigure 15-108 Sheet metal model of Tutorial 2

Figure 15-112 Flat pattern of the Sheet metal component

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3. Set 1mm in the Thickness spinnerand 2mm in the Default Bend Radius spinner. Choosethe OKbutton from the Sheet Metal Parameters dialog box.

4. Choose the Bend Extremities tab and select the Square relief option from thedrop-down list. Set 1mm and 2mm in the L1 and L2 spinners, respectively.

Drawing the Sketch for the Base Feature1. Invoke the Sketcher workbench by selecting the xy plane as the sketching plane to draw the

sketch, as shown in Figure 15-113.


Converting the Sketch into a Base wallFirst set the parameters in the Sheet Metal Parameters dialog box and then convert thesketch into a base wall.

1. Choose the Wall button from the Walls toolbar the Wall Definition dialog box isdisplayed. Select the sketch from the geometry area, if it is not already selected; it isdisplayed in the Selection selection area. Choose OKto create the base wall.

2. Choose the Hole button from the Holes toolbar and create a hole at the lower leftcorner of the base. For dimensions of the hole, refer to Figure 15-109.

3. Create the rectangular pattern of the hole. Change the current view to the isometricview. The base of the sheet metal component, after creating the hole pattern, is shown inFigure 15-114.

Figure 15-114 Base wall with the hole featureFigure 15-113 Sketch of the base feature

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Creating the Two Flanges1. Choose the Flange button from the Walls toolbar; the FlangeDefinition dialog box is

displayed.

2. Select the edge of the base wall, as shown in Figure 15-115. You will notice that the previewof the flange is displayed in the downward direction.

3. Set the value 50mm in the Length spinner. Choose the down arrow on the Length typebutton; a flyout is displayed. Choose the third button in the flyout.

4. Set 90deg in theAngle spinner and 2mm in the Radius spinner. Choose the ReverseDirection button, if required.

5. Choose the Reverse Direction button, if required and choose OK; the flange is created.

6. Similarly, create the flange on the other side of the base feature. The sheet metal component,after creating the flanges, is shown in Figure 15-116.

Creating the Hems1. Choose the Hem button from the Walls toolbar; the Hem Definition dialog box is

displayed. You are prompted to select an edge to create the hem.

2. Select the inner edge of the right flange; it is displayed in the Selection selection area.

3. Select the Basic option from the Flange type drop-down list.

4. Set 5mm value in the Length spinner and 1mm in the Radius spinner.

5. Accept the remaining default parameters in the Hem dialog box and choose the OKbutton to create the hem.

6. Similarly, create the hem on the other flange. The sheet metal component, aft

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