Computer Aided Design (CAD)

Computer Aided Design (CAD)

Project Type: Presentation (ppt)

Downloads: 0 - 10 Thursday 11th May 2017 Report

Computer Aided Design (CAD) - Overview

------------ PAGE 1 ------------ Computer- Aided Design Chapter 7 ------------ PAGE 2 ------------ 7 ------------ PAGE 3 ------------ Computer- Aided Design ( CAD) Use of computer systems to assist in the creation, modification, analysis, and optimization of a design Typical tools: ƒÞ Tolerance analysis ƒÞ Mass property calculations ƒÞ Finite- element modeling and visualization ------------ PAGE 4 ------------ Computer- Aided Manufacturing ( CAM) Use of computer systems to plan, manage, and control manufacturing operations Direct or indirect computer interface with the plant’s production resources Numerical control of machine tools Programming of robots ------------ PAGE 5 ------------ Computer- Aided Engineering ( CAE) Use of computer systems analyze CAD geometry Allows designer to simulate and study how the product will behave, allowing optimization Finite- element method ( FEM) ƒÞ Divides model into interconnected elements ƒÞ Solves continuous field ------------ PAGE 6 ------------ Computer- Aided Design Process Two types of activities: synthesis and analysis Synthesis is largely qualitative and hard capture on computer Analysis can be greatly enhanced with computers Once analysis is complete, design evaluation- rapid prototyping ------------ PAGE 7 ------------ Components of CAD/ CAM/ CAE Systems Major component is hardware and software allowing manipulation Hardware includes graphic devices and their peripherals for input and output operations Software includes packages that manipulate or analyze shapes according to user ------------ PAGE 8 ------------ Components of CAD/ CAM/ CAE Systems ------------ PAGE 9 ------------ Hardware Components Graphic device is composed of a display processing unit, a display device, and one more input devices Input devices: ƒÞ Mouse ƒÞ Space ball ƒÞ Data tablet with a puck or stylus ƒÞ Keyboard Output Devices: Plotters ------------ PAGE 10 ------------ Hardware Configuration # ------------ PAGE 11 ------------ Hardware Configuration # Requires a big initial investment for hardware and software Maintenance of mainframe is expensive Updating operating systems is difficult Slow system response times ------------ PAGE 12 ------------ Hardware Configuration # ------------ PAGE 13 ------------ Hardware Configuration # Engineering workstations connected in a networked environment Widely used; trend toward distributed computing User can choose appropriate workstation on a task Initial investment smaller than configuration # 1 ------------ PAGE 14 ------------ Hardware Configuration # Same as the second, except engineering workstations are replaced by personal computers running Microsoft Windows Popular with small companies Popular with companies whose main purpose is to generate drawings with their Distinction between configurations 2 and becoming blurred ------------ PAGE 15 ------------ Software Components CAD software allows the designer to create and manipulate a shape interactively and store it CAM software plans, manages and controls the operations of a manufacturing site CAE software analyzes design geometry, allowing designer to study product behavior ------------ PAGE 16 ------------ Windows- Based CAD Systems User interface is similar to Windows Employs component technology, in which best key software elements are selected from among available software Use object- oriented technology, which modularizes the program Capable of either parametric or variational modeling ------------ PAGE 17 ------------ Rapid Prototyping Layer by layer fabrication three- dimensional physical models from CAD Fast and inexpensive alternative for producing prototypes and functional models Build parts in thin layers Minimum operation time; typically runs unattended Rapid Prototyping has surgical applications ------------ PAGE 18 ------------ Medical Modeling - Zcorp ------------ PAGE 19 ------------ Rapid Prototyping Cycle ------------ PAGE 20 ------------ Rapid Prototyping Cycle . STL is standard file format for all U. S. rapid prototyping systems Preprocessing prepares . STL file for various rapid prototyping systems Build process can last from a few hours to several days Post processing: removal of part from machine, ------------ PAGE 21 ------------ Rapid Prototyping Process ( Damvig) “ A computer - controlled laser is scanned across the surface vat of liquid photopolymer, instantly solidifying the liquid each point of contact. Using generated from a CAD file, individual cross- sections of three- dimensional geometry solidified in turn to build up part layer by layer. In this way even highly complex geometries ------------ PAGE 22 ------------ geometries
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