An Introducation-Computer Aided Design-Lecture Slides, Slides of Computer Aided Design (CAD)

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INTRODUCTION 

THE INSTRUCTOR ENGR. AZMAT M. SAQIB(M.S. Mech. Engg., Texas A&M Univ., USA)



THE COURSE

More related to engineering practice.What is this course?The benefits…

COURSE OUTLINE1.

Introduction (1)

CADCAM HW. & SW. (2)

Design of Industrial Products (4)

Manufacturing Aspects of Industrial Products (3)

Role of Information Systems (3)

Integration of Manufacturing Systems (3)

1. DESIGN 

Serial



Concurrent Engineering

CAM (Computer Aided Manufacturing) Generally refers to the Computer Software usedto develop the Computer Numerical Control partprograms for machining and other processingapplications.

4.

CIM A management philosophy in which the functionsof design and manufacturing are rationalizedand coordinated using computer, communicationand information technologies.

CAD is faster and more accurate.

CAD would make the job of developing the model andassociated drafting a very easy task.

Under CAD, manipulation of various dimensions, attributesand distances of the drawing elements, are an easypossibility.

You can accurately calculate the various geometricproperties, such as dimensions, weight, volume, C.G. etc.interactively in CAD, without actually making their modelsand profiles.

Modification of a model is very easy, thus improvementsfor future needs are simple to implement.

Use of standard components (Parts/ Sub-assemblylibrary) makes for a very fast model development work.

BENEFITS OF CAD

4.

Computer Aided Manufacturing Three categories of Industrial Manufacturingactivity.

i.

Mass Production– Large Lots, e.g. Automobiles



Volume of production very high(Few thousands to millions per annum)



Use of special purpose machines to decreasecost of production.



Manufacturing methods inflexible



First Lead time large

ii.

Batch Production– medium lots e.g. Industrial machines, Aircrafts.



Volume, say 100 to 1000.



Use of special purpose machines which can be easily modified by the useof jigs and fixtures.

iii.

Job shop production– small lots or one of prototypes, aircraft.



Volume of very small lots, often single jobs.



Proving of design, Tool making of special purpose machines.



Manufacturing on general purpose machines



Manufacturing lengthy and often error prone.

CAM finds practicality in all the ranges



Greater design freedom:

Any changes that are required in

design can be incorporated at any design stage withoutworrying about any delays, since there would hardly be any inan integrated CAM environment.



Increased Productivity:

In view of the fact that the total

manufacturing activity is completely organised through thecomputer, it would be possible to increase the productivity ofthe plant.



Greater operating flexibility:

CAM enhances the flexibility in

manufacturing methods and changing of product lines.



Shorter lead time:

Lead times in manufacturing would be greatly

reduced.



Improved reliability:

In view of the better manufacturing

methods and controls at the manufacturing stage, the productsthus manufactured as well as of the manufacturing systemwould be highly reliable.

BENEFITS OF CAM



Reduced maintenance:

Since most of the components of a CAM

system would include integrated diagnostics and monitoringfacilities, they would require less maintenance compared to theconventional manufacturing methods.



Reduced Scrap and rework:

Because of the CNC machines used

in production, and the part programs being made by the storedgeometry from the design stage, the scrap level would bereduced to the minimum possible and almost no rework wouldbe necessary.



Better management control:

As discussed above, since all the

information and controlling functions are attempted with thehelp of the computer, a better management control on themanufacturing activity is possible.

5. Phases in the life cycle of a product

Concept & Feasibility Advanced Development

Full-scale Development & Integrated

Testing

Operations and Support