introduction to cad/cam
DESCRIPTION
Introduction to CAD/CAM. Agenda. Introduction to CAD/CAM Introduction to MASTERCAM 2D CAD using MASTERCAM Tool Path Planning in MASTERCAM Tool Path Optimization. Readings. Go through the Tutorial/ MasterCAM Modules on the Web. http://130.203.243.91/Lab%20Manuals%20Test%20Site/Frameset.htm. - PowerPoint PPT PresentationTRANSCRIPT
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Introduction to CAD/CAM
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Agenda
• Introduction to CAD/CAM
• Introduction to MASTERCAM
• 2D CAD using MASTERCAM
• Tool Path Planning in MASTERCAM
• Tool Path Optimization
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Readings
http://130.203.243.91/Lab%20Manuals%20Test%20Site/Frameset.htm
Go through the Tutorial/ MasterCAM Modules on the Web
Groover Mikell,Zimmers W Emory, CAD/CAM Computer Aided Design and Manufacturing , Chapter 2-5, Prentice Hall 1984.
Chang, et al, Computer Aided Manufacturing, Chapter 10, Prentice-Hall, 1991.
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ExerciseReadiness Assessment Test A.K.A. RAT
AS A INDIVIDUALAS A INDIVIDUAL, prepare a detailed response for the Readiness Assessment test found on the web
http://www.engr.psu.edu/cim/ie450/ie450rat4.doc
Open Book / Open Notes
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Objectives
• To understand the need for CAD/CAM in Lean Manufacturing.
• To be able to create 2D Geometries in MASTERCAM
• To be able to create 2D toolpaths in MASTERCAM
• To use MASTERCAM for identifying optimum toolpaths
• To generate NC codes using MASTERCAM
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CAD/CAM
• Computer-aided design (CAD) is the use of computer systems to assist in the creation, modification, analysis, or optimization of a design.
• Computer-aided manufacturing (CAM) is the use of computer systems to plan, manage, and control the operations of a manufacturing plant through direct or indirect computer interface with plant’s resources.
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Need for CAD/CAM
• To increase productivity of the designer
•To improve quality of the design
•To improve communications
•To create a manufacturing database
•To create and test toolpaths and optimize them
•To help in production scheduling and MRP models
•To have effective shop floor control
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How do CAD/CAM systems work?
• Developing NC code requires an understanding of:
1. Part geometry
2. Tooling
3. Process plans
4. Tolerances
5. Fixturing
• Most CAD/CAM systems provide access to:
1. Part geometry
2. Tooling
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Instructions can be generated for a generic NC machine
•A set of tool paths and positions can be automatically generated
•These paths can be edited and modified
•These paths and instructions can then be “posted” to a specific machine
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The Design Process : Then and Now
Before CAD After CAD
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CAD/CAM and the new Environment
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Exercise (3-5 mins)
• Discuss how CAD/CAM helps in Lean Manufacturing? Elaborate on any one aspect.
• What advantages does CAD/CAM approach offer in NC Programming?
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CAD/CAM Support
• AutoCAD 200i
• Pro Engineer 2001
• MasterCAM
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What do I need to begin MasterCAM?
• Part geometry– Draw or import
• Tooling– Library or create
• Process plans
• Fixtures– Define orientation and location
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MasterCAM• Mastercam is a three-dimensional
geometry creation engine along with features to aid in tool path generation and verification.
MasterCAM allows tool path planning and NC code generation for a given part. This part can either be drawn in MasterCAM or imported from other CAD packages
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MasterCAM Drawing
• Geometrical part drawing– In-built CAD package
• Two-dimensional parts• Three-dimensional parts
– Translators (include)• IGES (international Graphics Exchange Standard)• DXF (AutoCad)• CADL (CADKey)
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Tool Path Generation using MasterCAM
• Tool path generation– Extensive Tool library– Machining parameter selection– NC program generator– Animation to visualize machining operations
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Exercise (individual)
• Is it always good to use a CAD/CAM package? Why?
• What are the advantages of using a CAD/CAM system?
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Exercise (Group)
• Develop a set of rules as to when to use a CAD/CAM system.
• Create an economic model that can be used to justify using MasterCAM or a similar system.
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Getting Started with 2D Drawing• Create simple 2D Geometries using basic
shapes say a Rectangle
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Building 2D Geometry
• Place and Dimension the Shape
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Creating Shape with Lines and Rectangles
• Complete the Basic profile. We will now add arcs, fillets and trim entities
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Adding Arcs, Radius and Fillets• Click on Main Menu [Create- Arc-pt dia cir] on to
dimension and place arcs/circles
• Click on Main Menu [Create-Fillets] to create Fillets. Dimension them Suitably.
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Completing our Mock Profile• To Trim or Cut entities Main Menu [Modify-Trim-2
Entities] to get required profile.
Don’t forget to Save your file
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Getting started with Toolpaths• Click on Main Menu [Toolpaths]. MasterCAM lists
the different machining operations
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Contouring Options
• By Selecting Contour the various Contouring Options are listed. Select Chain and the geometry chains up and shows tool travel direction
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Defining Tool Parameters• Select the Contour type and Tool Parameters Window
pops up. Feed the Right Parameters and Right Click to Select Specific Tools.
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Selecting the Tools• MasterCAM has a whole range of tools in a tool library from which
tool selections can be made. Now feed the correct parameters.• You can also specify your own tools.
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Displaying Toolpaths• Once both the Tool parameters and Contour Parameters have been
Correctly defined. Click Ok to display the Toolpath.
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Toolpath Optimization?
• MASTERCAM does NOT give a minimum time Toolpath. It gives the toolpath that has been selected.
Exercise :
Try out different toolpaths from the toolpaths pallete for the part in the tutorial. Which one is optimal? Why?