1 2.008 design & manufacturing ii spring 2004 process planning cad/cam ref 1: cad/cam/cae...
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2.008 Design & Manufacturing
II
Spring 2004
Process PlanningCAD/CAM
Ref 1: CAD/CAM/CAE systems, by K.W. Lee, Addison-Wesley, 1999Ref. 2: Computer Aided Manufacturing, 2nd ed. by T.C. Chang, R. A. Wysk, and H-P Wang, Prentice Hall 1998Ref.3: Manufacturing: Design, Production, Automation and Integration, by B. Benhabib, Marcel Dekker, New York, 2003
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- Lab starts today.- Monday 2/16, President’s day, a Holiday- Tuesday 2/17, Monday’s lecture & lab group A- HW#1 due 2/11 (W)
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2D drafting v.s. digital Playdo
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Product Cycle
Analysis CAE
Synthesis CAD
Functional Requirements
Design Paramete
Design
Process Planning
CAM
Production
Quality control Packaging Shipping
Manufacturing
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3 day prototyping byCAD/CAM/CAE
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-Catia, Euclid, AutoCAD, ProEngineer Solidworks- MasterCAM, PowerMill- Moldflow, C-Flow, ANSYS, I-DEAS
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Geometric Modeling – HistoricalDevelopment
• 1960-1962: The first Graphical User Interface (GUI), Sketchpad, developed at MIT.• 1964-1965: DAC-1 by GM and CADAM by Lockheed.• 1970-1980: Various systems that ran on proprietary hardware – only a handful survived beyond the 1990s.• 1990-2000: Pro/Engineer, Solid Works and I-DEAS run on PC platforms.
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3D object geometric modeling
Wireframe Surface modeling
Solid modeling ?2.008 MIT-S. Kim
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Wire frame
■ List of ■ Curve equations ■ Coordinates of points■ Connectivity■ Easy method■ Ambiguity■ No mass, no surface
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Wireframe
Conversion to surface
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Surface Modeler
MIT Stata Center
Guggenheim, Bilbao2.008 MIT-S. Kim
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Surface Modeler
■ Wireframe data +■ Surfaces ■ Connectivity, Adjacency ■ Interpolation of points, curve nets ■ Translation or sweeping of curves■ Fits to complex free formed surfaces ■ Visual, aesthetic design ■ NC code generation
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Solid Modeler
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Solid modeler
■ Has a closed volume. ■ Knows “in” or “out”■ Has a mass and inertia.■ Huge input data, maths.■ User friendliness is a must. ■ Primitives ■ +/- by Boolean operations ■ Sweeping, rounding, lifting■ Hybrid (solid + Surface, CSG + BREP, Parametric + explicit)
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Primitives
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Block Cylinder
Wedge Sphere
Cone TorusTranslation sweep Rotation sweep
Tool
Then■ Add/subtract■ Move■ Modify
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Boolean operations
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Acceptable Operation?
union
intersection
difference
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By sweeping, skinning surfaces
translational
rotational
skinning
Director curve
Swept solid
Axis of revolution
Swept solid
Section 2
Trajectory
Generator surface
Generator surface
Section 1
Section 3
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By modifying existing shapes
Edge rounding Filleting
Lifting
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Constructive Solid Geometry
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• CSG modelers allow designers to combine a set of primitives through Boolean operations:
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Boundary Representation
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Polyhedron
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Feature-based Design
Open slotThrough hole
Chamfering Hole
Pocket fillet
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Machining Features
Blind hole Through hole Pocket
Blind slot Through slot Radius
Open slot Shoulder Angle
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Counterbore
Through tap
Counterbore
Blind tap
Countersink Countersink
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Parametric modeling
■ Feature-based■ Dimension data■ Geometric constraints
■ Assembly modeling■ No standard of data exchange■ IGES (Initial Graphic Exchnage Standards)
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Geometric Modeling - Curves
Least-square fit
spline fit
Bezier Curve
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Geometric Modeling - Curves
B-spline : more flexibility than Bezier
NURB (non-uniform rational B-spline): Combine all
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Geometric Modeling – Free form Surface
NURB (non-uniform rational B-spline): Combine all
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Process Planning (CAPP)
■ “Act of preparing detailed work instructions to machine or assemble a part or parts” –Chang, Wysk, Wang■ Sequence of manufacturing processes and/or assembly operations■ Operation sheet
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■ Have customers eat well■ Customers serviced well ■ speed ■ customization■ Affordable tab■ $$$ - Profit
Restaurant Owner
What’s the difference between McDonald v.s. Maison Robert?
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Super bowl 2004
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Play bookPlay number
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Image removed due to copyright considerations.
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Process Planning
■ Manual Approach
■ Comupter Aided Process Planning (CAPP) ■ Variant Approach: Group Technology
■ Generative Approach: features, tolerances
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Example 1 by manual approach
Setup 1Chuck the workpieceTurn S3 to a 100mm diameterFace S1Core drill S2Counter bore S4, S5
Setup 2Chuck the workpiece on S3Turn S6 to 50 mm diameterUndercut the neckThread S6Face S7
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Group Technology
Zip code: 02139Product Classification
Injection molding
Aluminum diecasting
Sheet metal fabrication
Inflammable plastic Regular
plastic
With ribs
Without ribs
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Vuoso-Praha coding system
4 digit system-Kind-Class-Group-Material
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Coding system (continued)
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3 3 7 2
Alloy steel
Threaded, hole not in axis
Max.φ40-80
Rotational through hole
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Feature-based CAPP
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Open slotThrough hole
Chamfering Hole
Pocket fillet
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Numerical Control
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Spindle speed selector
Feed change gear box
Compound rest and
slide (swivels)
Apron BedLead screw
Feed rod
Headstock
Spindle
Ways
Tool postCross slide
Cartridge (saddle)Center
Tailstock quill
TailstocklTool
Worktable
5-axis millingLathe - conventional
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Motion Control
■ Point to point, Continuous■ Interpolation■ Encoders, tachometers and interferometers provide high-precision displacement and velocity feedback:
Controller Amplifier Actuator Worktable
Displacement sensor
⊕⊕Input from interpolator
Velocity Sensor
+- -
+
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Adaptable Control
- sense cutting force, torque, temperature, etc.- tool wear, tool breakage
CNC controller
Adaptive controller
Machine tool
Sensors
Signal processing
Programmed dimensional data
feed rate , spindle speed
Updated spindle speed,
feed rate
Constraints
Strategy
Performance index
Displacement/velocity feedback
Displacement commands
Spindle-speed command
Torque
Vibration
Temperature
B. Benhabib2.008 MIT-S. Kim
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NC milling machine
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Code function Explanation
g00 Point to point, positioning Use with combination point-to-point/contouring systems for in-
dicating positioning operation.
g01 Linear interpolation
(normal dimensions)
A mode of contouring control used of generating a slope or
Straight cut, where the incremental dimensions are normal (i.e.,
Input resolution is as specified).
g02 Circular interpolation are CW(normal dimensions)
A mode of contouring control that produces an arc of a circle by
The coordinated motion of two axes. The curvature of the path
(clockwise=g02, or counterclockwise=g03) is determined
when viewing the plane of motion in the negative direction of
The perpendicular axis. The distances to the arc center (I, j, k) are
“normal dimensions.”
g03 Circular interpolation are CCW
(normal dimensions)
g04 Dwell A programmed (or established) time delay, during which there is
No machine motion. Its duration is adjusted elsewhere, usually by
The f word. In this case dimension words should be set at zero.
g05 Hold Machine motion stopped until terminated by an operator or inter-
Lock action.
g06 Parabolic interpolation
(normal dimensions)
A mode of contouring control that uses the information contained
In successive blocks to produce a segment of a parabola.
g08 Acceleration The feed rate (axes’ velocity) increases smoothly (usually expo-
nentially) to the programmed rate, which is noted later in the
Same block.
g09 Deceleration The feed rate decreases (usually exponentially) to a fixed percent
Of the programmed feed rate in the deceleration block.
g10 Linear interpolation
Long dimensions = LD)
Similar to g01, except that all dimensions are multiplied by 10.
For example, a programmed dimension of 9874 will produce a
travel of 98740 basic lenth-units. (used only with incremental
Programming.)
g11 Linear interpolation
(short dimensions = SD)
As g01, but dividing all dimensions by 10 (e.g., 987 units for the
Example above).
Source : Y.Korenl, Computer Control of Manufacturing Systems, McGraw-Hill, 1983.
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Analogy: Word document ←→ Part
Embodiment Plan execution Translate plan Execute plan
Rough draft
User input
Formatting Pdf
Post script
Machine (i.e.
printer)
Word processor
Print set up
File exchange
Generate tangible
Sketch/idea
User input
Blueprint/ CAD
Feature generation
CAM
Process planning
G Code
File exchange
Machine (i.e. mill)
Generate tangible
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Tool path generation
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g-code
■ N0027 G01 X175.25 Y325.00 Z136.50 F125 S800T1712 M03 M08
Statement Number 27 (N0027) a linear-interpolation motion(G01) to a position defined by (X175.25 Y325.00 Z136.50),with a feed rate of 125 mm/min (F125), and a spindle speed of800 rpm (S800), using a tool Number 1712 (T1712), performinga c/w turn of the spindle (M03), and having the coolant on(M08).
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N001 G91N002 G71N003 G00 X0.0 Y0.0 Z40.0 T01, M06
N004 G01 X75.0 Y0.0 Z-40.0 F950 S717 M03N005 G01 Z10.0 F350 M08
N006 G01 X110.0N007 G01 Y70.0
N008 G01 X-40.86N009 G02 X-28.28 Y0.0 I14.14 J5.0
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Manual Programming
Start point
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Cutter Location, P4
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APT –Automatic Programming Tool
■ APT developed at MIT in 1956.
■ APT II, APT III
■ Identification statement ■ Geometric Statements ■ Motion statement ■ Post-processor statement ■ Auxiliary statement
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Geometry statements
Points
P1 = POINT/X,Y,Z
P2 = POINT/L1,L1 ; intersection of two lines already defined
P3 = POINT/CENTER,C1 ; center of a circle
P4 = POINT/YLARGE, INTOF, L1, C1
; intersection of a line and a circle, one with a
larger y coordinate
P5 = POINT/XLARGE, INTOF, L1, CI
; intersection of a line and a circle, one with a
larger x coordinate
P6 = POINT/YLARGE, INTOF, C1, C2
; intersection of two circles, one with a larger y
coordinate
P7 = POINT/XLARGE, INTOF, C1, C2
; intersection of two circles, one with a larger x
coordinate
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APT statements (cont.)
Lines Circles
degree
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Motion statement
• P to P-motion: GOTO/Point_Name; Go to Point Point_Name. GODLTA/ΔX, ΔY, ΔZ; Move incrementally.• CP-motion:
/ Drive_Surface,, Part Surface Check_
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Ending locations
TO ON PAST
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Example
FROM/SP
GO/TO, L1, TO, PS, ON L4
GORGT/L1, PAST, L2
GOLFT/L2, PAST, L3
GOLFT/L3, PAST , C1
GOLFT/C1, PAST, L3
GOLFT/L3, PAST, L4
GOLFT/L4, PAST, L1
GOTO/SP
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Tool path interval and Cusp
ContourNon-lace
LaceParallel
Cusp
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Contour
Non-lace
Parallel paths
Path interval
Cusp height
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Machined Surface
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Machined SurfaceW = “Waviness”
R = “Roughness”
Waviness Height
Flaw
Roughness Height
Lay direction
R. widthW. width R. Width cutoff
W. height
R. Height (arithmetical
average)
Lay
R. width
W. width
R. Width cutoff
Rough 1000
Medium 500
Avg. 125
Better than Avg. 63
Fine 32
Very fine 16
Extremely fine 8
µ inch
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Cutter Contact, Gouge
Contact Point
Gouging
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CC-point
CL-point
Location of gouging
Neighboring surface
Part surface