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ME C382:

COMPUTER AIDED DESIGN

r. ega a r n vasa ra as

Professor

I/C: Dr. Regalla Srinivasa Prakash, Mechanical Engg., B. I. T. S., Pilani 1



OBJECTIVES OF THE COURSE

• The objectives of the course is to cover as,

techniques, underlying principles andbenefits of com uterization of mechanicalengineering design process in the current

perspective, without repeating what istaught in the basic ‘ME C312: design of machine elements’ course. The project is

es gne o ena e e s u en s o avehands-on practice of the subject taught in


.



ME C382: COMPUTER AIDED DESIGN

I/C and Lecture Section: Dr. Regalla Srinivasa Prakash

Chamber Consultancy: C213, Thursday 3 PM to 4 PM

.

Tutorials (Every Monday, 8 am):Tutorial Instructors (3 sections):

. – .

Pattern of Tutorial Class:• problem solving (evaluated),

• problem solving (practice non-evaluated),

•

• quiz




Course Project

• Step 1: The whole class will be divided into batches of four students each.

•

the notice board.• Step 3: Student must read the necessary material from

.

• Step 4: Pro/E and/or Ansys.

• Ste 5: Pro ect demonstration and submission will be infrom March 15 and continue for all batches.

• All projects will have been submitted latest by April 15.




• –

• TEST – II: 60 MARKS OB (20%)

• urpr se u z

• COMPRE: 120 MARKS POB(40%)• PROJECT: 30 MARKS (10%)

•




Scope of ME C382: COMPUTER AIDED DESIGN

– Using CAD systems – Geometric modeling

– Computer Graphics• Geometric Transformations

• Visualization

• Computer Animation

– Product Desi n and Develo ment• Mass Properties

• Assembly Modeling

• Finite Element Method• Product Data Exchange

• Collaborative Design

– Product Manufacturing and Management

• Engineering Tolerances• Process Planning

• Part Programming


• ro uc ecyc e anagemen



BOOKS AND REFERENCES• II. Textbook

• Zeid , Ibrahim, “CAD/CAM: Theory and Practice”, Tata McGraw-Hill, 1991.

• III. Reference

• Srinivasa Prakash Regalla, “Computer Aided Analysis and Design”, IK International

Publishers, New Delhi, 2010.

• Ibrahim Zeid “Masterin CAD/CAM” Tata McGraw-Hill New Delhi 2007.

• Siddeshwar N., Kannaiah P. and Sastry V. V. S,, “Machine Drawing”, Tata McGraw-Hill,New Delhi, 2006.

General References:

• J. Adkin, Ed.: Computer-Assisted Mechanical Design, Prentice Hall, 1990.

• J. Bowman, et.al.: The CAD/CAM Primer, Welborn Associates.

• G.Farin: Curves and Surfaces for Computer Aided Geometric Design, Academic Press, San Diego,.

• T.E. French, et.al.: Engineering Drawing and Graphic Technology, McGraw-Hill, 1986.

• W.K. Giloi: An Introduction to Solid Modeling, Computer Science Press.

• M.P. Groover, and E.W. Zimmer: CAD/CAM: Computer-Aided Design and Manufacturing, PrenticeHall, 1984.

. , - , .

• M.E. Mortenson: Geometric Modeling, John Wiley & Sons, New York, 1985.

• D.F. Rogers, and J.A. Adams: Mathematical Elements for Computer Graphics, 2nd edition, McGraw-Hill Publishing Company, New York, 1990.

• J.J. Shah, and M. Montyl: Parametric and Feature-Based CAD/CAM, Concepts, Techniques, and


, , , .

• Farid Amirouche, Princip les of Computer Aided Design and manufacturing, Prentice hall, 2004



CHAPTER 1 - INTRODUCTIONGOAL

Understand and master the nature of CAD/CAM s stems their basicstructure, their use in engineering tasks, and their use to create

geometric models of simple parts.

After reading this chapter, you should understand the following

concepts:

Product life cycle

Scope of CAD/CAM

CAD/CAM A lications

Acquiring CAD/CAM Systems

Installing CAD/CAM Systems

GUIs and Hel p menus

Demo parts




Introduction• CAD(Computer Aided Design)

•

• CAE(Computer Aided Engineering)

e y y, e ee ,

Interactive graphicsuality, ost, Delivery CIM

CAD CAE

CAM Others




Product cycle

DESIGN PROCESS

Design

Need

Design

Spesifications

Feasibility Study with

Collecting Design Information

Anal sis

yn es s

DesignDocumentation

DesignEvaluation

DesignOptimization

Design Analysis

AnalysisModel

Design

Conceptuali-

zation

CAD + CAE

Process

Planning

Production

PlanningProducttion

Quality

ControlPackaging Shipping

Procurement of

New Tools

Order Material

CAM

NC, CNC, DNC

ProgrammingMarketing


MANUFACTURING PROCESS



THE CAD PROCESS

Design Design Modeling

Conceptualization and Simulation

Design AnalysisDesign

OptimizationDesign Evaluation

Design

Communication

and Documentation




Computer

Gra hics

Design &Concepts

Design Tools

(Analysis, Codes,

CAD

Tools

u .

Geometric

Modeling




Definition of CAD tools based on

ImplementationHARDWARE

(central unit, displayterminals, input./output

devices

DESIGN TOOLS + COMPUTER = CAD TOOLS

SOFTWARE

(graphics, modeling, applications

programming)




THREE SETS OF SOFTWARE

• CAD/CAM Systems

– SOLIDWORKS Pro/ENGINEER CATIA

Unigraphics, I-Deas, CADKEY, AutoCAD•

– Java, Java 3D, C, C++, OpenGL, DirectX,

VRML FTP Telnet Web browsers MATLAB

• Symbolic equation solvers

– , ,




CAD Based Product Life Cycle

Involves… (contd.)

• Design evaluation and making prototype:

– Rapid Prototyping (RP)

– Virtual Prototyping (VP)




Solid model of example part




Finite element analysis model of example part

Finite element meshes Load condition:

case 1

Load condition:

case 2




Fill time distribution for example part




Ph sical rotot e of exam le art




Core, cavity, and side cores for

example part




CAD Based Product Life Cycle

•

Involves…

, .

• na ys s mo e w t proper a stract on

• Interactive generation of analysis model




RP – Stereo-lithography

ProcessXY Scannin Ultraviolet Laser Beam Elevator

Photo-curableTop of the Liquid

Cured Plastic


a orm



CAD Based Product cycle,

eps nvo ve … con .

• Design documentation

– Computer aided drafting system

– Automatic drafting program




CAD Based Product cycle, Step Involved… (contd.)

ompu er e ra ng ys em:




CAD Based Product cycle,

eps nvo ve – con .•

–

–

– o o , or nspec on




•

or more of the following forms: –

– Geometric modeling system

–




Definitions of, an

First of all we will look at CAM and finish

it! ->


CAM ll it d t !



CAM – well it needs a separate course!

We will simply define it!

• Therefore, simply speaking: – CAM is Computer Aided Manufacturing, and may be defined as

use of computers, directly or indirectly, in all activities of ,

various other sub-systems

– GM codes and APT (Automatically Programmed Tools) are themost commonly used languages for programming to instruct themac ne oo s an measur ng ns rumen s

– Machine tools in the CAM paradigm, are freshly termed as NC orCNC or DNC machine tools because now they are controlled by1’s and 0’s binar s stem – that is a com uter ro raminterpreted by a microprocessor – instead of the skillful hands ofa machinist

– full-scale CNC machine to come to the Institute? Yes, by- ,




Custom 10' x 10' Milling machine with 10 Spindles




Custom 48' x 5' CNC with 2 Sonic Welders




Sample runs!

• CNC milling of a aluminium prismatic part

• CNC milling of pockets and slots in a foamad

cylindrical part on a lathe

• CNC machining of a baseball bat


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