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Computer aided design


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Nice Ppt about CAD

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Computer aided design

  1. 1. Computer-Aided Design Chapter 7
  2. 2. Computer-Aided Design (CAD)Use of computer systems to assistin the creation, modification,analysis, and optimization of adesignTypical tools: Tolerance analysis Mass property calculations Finite-element modeling and visualizationDefines the geometry of the design
  3. 3. Computer-Aided Manufacturing (CAM)Use of computer systems toplan, manage, and controlmanufacturing operationsDirect or indirect computerinterface with the plant’sproduction resourcesNumerical control of machinetoolsProgramming of robots
  4. 4. Computer-Aided Engineering (CAE) Use of computer systems to analyze CAD geometry Allows designer to simulate and study how the product will behave, allowing for optimization Finite-element method (FEM)  Divides model into interconnected elements  Solves continuous field problems
  5. 5. Computer-Aided Design ProcessTwo types of activities: synthesis andanalysisSynthesis is largely qualitative and hard tocapture on computerAnalysis can be greatly enhanced withcomputersOnce analysis is complete, designevaluation- rapid prototypingSoftware packages for design optimization
  6. 6. Components of CAD/CAM/CAE Systems Major component is hardware and software allowing shape manipulation Hardware includes graphic devices and their peripherals for input and output operations Software includes packages that manipulate or analyze shapes according to user interaction
  7. 7. Components of CAD/CAM/CAE Systems
  8. 8. Hardware ComponentsGraphic device is composed of a displayprocessing unit, a display device, and one ormore input devicesInput devices: Mouse Space ball Data tablet with a puck or stylus KeyboardOutput Devices: Plotters Color laser printers
  9. 9. Hardware Configuration #1
  10. 10. Hardware Configuration #1 Requires a big initial investment forhardware and software Slow system response times Maintenance of mainframe is expensive Updating operating systems is difficult
  11. 11. Hardware Configuration #2
  12. 12. Hardware Configuration #2 Widely used; trend Engineering toward distributedworkstations connected computing in a networked environment Initial investment is User can choose smaller than appropriate configuration #1workstation on a task by task basis
  13. 13. Hardware Configuration #3 Popular with Same as the second,small companies except engineering workstations are replaced by personal computers running Microsoft WindowsPopular with companieswhose main purpose is Distinction between to generate drawings configurations 2 and 3 with their becoming blurred asCAD/CAM/CAE systems personal computers evolve
  14. 14. Software ComponentsCAD software allows the designer tocreate and manipulate a shapeinteractively and store itCAM software plans, manages andcontrols the operations of a manufacturingsiteCAE software analyzes design geometry,allowing designer to study productbehavior
  15. 15. Windows-Based CAD SystemsUser interface is similar to WindowsEmploys component technology, in whichbest key software elements are selectedfrom among available softwareUse object-oriented technology, whichmodularizes the programCapable of either parametric or variationalmodelingInternet support
  16. 16. Rapid Prototyping Layer by layer fabrication of three-dimensional physical models from CAD Fast and inexpensive alternative for producing prototypes and functional modelsRapid Prototyping has surgical applications Build parts in thin layers Minimum operation time; typically runs unattended
  17. 17. Medical Modeling - Zcorp
  18. 18. Rapid Prototyping Cycle
  19. 19. Rapid Prototyping Cycle.STL is standard file formatfor all U.S. rapidprototyping systemsPreprocessing prepares.STL file for various rapidprototyping systemsBuild process can lastfrom a few hours toseveral daysPost processing: removalof part from machine,support removal, sanding
  20. 20. Rapid Prototyping Process (Damvig ) “A computer-controlled laser beam is scanned across the surface of a vat of liquid photopolymer, instantly solidifying the liquid at each point of contact. Using data generated from a CAD file, individual cross-sections of the three-dimensional geometry are solidified in turn to build up a solid part layer by layer. In this way even highly complex geometries can be built in a few hours without requiring any tools. “