Cad cam cae

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Presentation of CAD-CAM-CAE
Fablab - LIMA 2010

Published in: Education

Cad cam cae

  1. 1. CAD - CAM - CAE Casiano Arroyo, Manuel Garrido, Roxana Paredes, Jorge Quino Quispe, Gustavo Sanchez Loayza, Luis Guillermo Tabuchi Yagui, Edgardo Toshiro
  2. 2. 1. Generalities CAD CAE CAM
  3. 3. 1.1 History
  4. 4. 1.1 History
  5. 5. 1.1 History
  6. 6. 1.1 History
  7. 7. 1.1 History
  8. 8. 1.1 History
  9. 9. Computer aided design is defined as the integrated use of computer systems to assist in the creation, modification, analysis or optimization of a design. It is the technology concerned with the use of digital computers to perform certain functions in design and production. It is the major element of computer aided engineering. Computer-Aided Design (CAD) Potencialities •Increase productivity •quality improvement •Varity of possible geometries •Reduced design time 1.2 CAD
  10. 10. Software Applications Standard model
  11. 11. NURBs modeling (Non Unifrom Rational B-Splines)
  12. 12. 1.3 CAM (Computer Aided Manufacturing) •Machining •CNC •Advantages
  13. 13. 1.4 Computer -Aided Engineering (CAE) Is the use of computer software and hardware in the translation of computer-aided design models into manufacturing instructions for numerical controlled machine tools. Applications CAM takes this one step further by bridging the gap between the conceptual design and the manufacturing of the finished product. For the sake of convenience, a single computer ‘controller’ can drive all of the tools in a single cell. G-code instructions can be fed to this controller and then left to run the cell with minimal input from human supervisors. •stress analysis •vibration analysis •Structural analysis • Noise thermal distortion, etc. •Explicit Dynamics •Fluid Flow •Harmonic Response •Linear Buckling •More applications…
  14. 14. Process of CAE Example: Stress Analysis •Create a part or an assembly. •Define properties. •Material selection •Define analysis steps. •Define interaction. •Loads. •Mesh •Job. •Visualization.
  15. 15. 2. CAD 2.1 Theory CAD – Computer Aided Design
  16. 16. Raster & Vector 2D: Pixel 3D: Voxel 2D: Geometry Figures 3D: Solid Geometry
  17. 17. 2D: Bezier Curve • Used commonly in 2D Graphic Design softwares.
  18. 18. 2D: Spline • Used in 2D modeling software
  19. 19. 2D to 3D
  20. 20. 3D: CAD
  21. 21. CAD
  22. 22. CAD
  23. 23. Boundary representation (B-Rep) Boundary representation models are composed basically of two parts: Topology: & Geometry
  24. 24. Boundary representation (B-Rep) • Topology: faces, edges and vertices. • Geometry: surfaces, curves and points. Extended EulerPoincarré formula: Faces + Vertices – Edges – Rings = 2(Shells Holes)
  25. 25. Boundary representation (B-Rep) • The extended Euler- Poincarré formula allow test the topology for polyhedral solids: Faces = 3 Vertices = 0 Edges = 2 3 + 0 – 2 – 0 … 2 (1 – 0 )
  26. 26. Constructive solid geometry (CSG) • Primitives: cuboids, cylinders, prisms, pyramids, spheres, cones. • Operations: union, intersection and difference.
  27. 27. Constructive solid geometry (CSG)
  28. 28. Constructive solid geometry (CSG) • Infinite cylinder, I: x^2 + y^2 – r^2 <= 0 • Infinite planar halfspace, P: Ax + By + Cz + D <= 0 • Cylinder with ends: I ^ P1 ^ P2
  29. 29. Constructive solid geometry (CSG)
  30. 30. Function representation (F-Rep)
  31. 31. Function representation (F-Rep) • The objects defined by a single continuous real-valued function of point coordinates F(x) • The points with F(x) >= 0 belong to the object. • The points with F(x) < 0 are outside of the object. • The point set with F(x)=0 is called an isosurface.
  32. 32. B-Rep vs F-Rep • Calculating surface area is easy • The model is evaluated • Easy to triangulate the surface • Making pictures is easy • B- rep primitives are local • Calculating volume and mass is easy • The model is unevaluated • Easy to make numerically robust • Input is pretty straightforward • The data structures are compact
  33. 33. B-Rep vs F-Rep Ray Tracing
  34. 34. The Z-buffer All commercial systems are BRep. because the the depth buffer or Z-buffer is the predominant technology. The silicon graphics and flight simulator then the computer games impulse that technology. • For each pixel store both colour and depth • Send it 3D coloured triangles in any order • Surfaces in front win
  35. 35. The CAD softwares – B-Rep • They grew out of 2D drafting • BRep is quick to render on ancient computers.
  36. 36. parametric design parametric geometry geometrics parametrics parameter 2.2 Parametric Design
  37. 37. parametric design parametric geometry geometrics parametrics parameter
  38. 38. parametric design parametric geometry geometrics parametrics parameter reality irreality
  39. 39. + Matter & Energy - Information - Matter & Energy + Information
  40. 40. R R A ∏ R =
  41. 41. A B n… 1 2 A = … B = … 1 = [A+B+….] 2 = [1+B+A…]
  42. 42. emotion passion creative freedom responsibility impact possibility
  43. 43. M E I
  44. 44. new tools new concepts new tools new concepts F. Dyson the evolution of science use
  45. 45. 2. CAD 2.3 Software
  46. 46. 2D: Softwares: Inkscape
  47. 47. 2D: Softwares: Illustrator
  48. 48. 2D Softwares: Corel Draw
  49. 49. 2D: Softwares: Photoshop
  50. 50. 2D: Softwares: Cabri Geometry
  51. 51. 3D Software: Blender Modeling, animation, created by NeoGeo
  52. 52. 3D Software: Rhinoceros industrial design, architecture, marine design, automotive design, CAD / CAM, rapid prototyping, reverse engineering, industry as well as graphic design and multimedia
  53. 53. 3D Software: SolidWorks
  54. 54. 3D Software: Catia
  55. 55. 3D Software: Pro Engineer
  56. 56. 3D Software: AutoCAD
  57. 57. 3D Software: Maya
  58. 58. 3D Software: Inventor
  59. 59. 3D Software: Solid Edge
  60. 60. 3D Software: Generative components Parametric CAD software developed by Bentley Systems
  61. 61. 3D Software: Visual Nastran 4D
  62. 62. 3D Software: World Craft
  63. 63. 3D Software: Revit
  64. 64. 3D Software: Tekla
  65. 65. 2. CAD 2.4 Examples
  66. 66. 2.41 Computarization It focuses only in the use of the software. It requires knowledge knowledge about the software and its tools. Example •Model a cylinder
  67. 67. Method 1 • Create new document. • Create the sketch. • Assign dimensions. • Create the operation Extrusion.
  68. 68. 2.42 Computation It focuses more in logic than in the use of the software. It requires knowledge of algorithms. Example •Model a cylinder Here a program was created using Visual Basic and the API of Solidworks.
  69. 69. Method 2
  70. 70. 2.43 Another Example Example: Model a gear Method 1 • Draw the geometry of gear’s tooth.
  71. 71. • The geometry of the gear’s teeth is complicated to draw. • Each new gear would be a new problem to solve. • Thus it is strongly recommended to create a routine to create gears with some initial parameters.
  72. 72. • Creating a program or script. Method 2
  73. 73. Project Choose an object of the nature. Analize it and create a software or script to generate its geometry.

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