Practical Applications of C. A. D. to Design and Manufacture of Automobile Bodies at PSA Peugeot - Citroen 790720

This paper discusses from the view point of PEUGEOT-CITROEN, the main advantages and the practical applications of C.A.D. (Computer Aided Design), concerning the design and manufacturing of their latest models, such as 305, CX, 604, VISA…
Numerical definition of complex surfaces has helped the Stylists considerably:
  • machining of first models from a draft,
  • local modifications,
  • milling of the model for approval.
Some internal structure elements can be automatically designed from the numerical external shape. This allows check of possible interference between mechanical elements and the internal structure.
High feed rate numerical milling machines for soft materials allow an easy machining of prototype dies, master models and scale models for aerodynamic studies.
Numerical design of parts is also used for the direct milling of stamping tools and the manufacturing of injection moulds for plastic elements that take account automatically of the shrinkage.
The conclusions will emphasize the benefit obtained on the latest cars, concerning quality, time and cost.


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