In the recent years, there have been great breakthrough and compelling achievements in the fields of CIMS and CAD/CAM. The development of Computer-Aided Tolerancing(CAT), however, lags highly behind that of CAD/CAM as important part of machinery design and manufacture process. In view of this case, the author has done the following research work.â— In this paper, we discuss the theory of Design For Tolerancing (DFT). The traditional thinking of design is form-to-function process. In a dynamic architecture, a multi-level approach called Design For Tolerancing(DFT), has been proposed to help the designers to make tolerance-related decisions from the conceptual design to detailed design. On the base of anlysis of the traditional tolerancing design, we expound the theory of DFT on system ground.â— we also discuss the way of tolerance analsys and synthesis. And we upbuild the tolerance- processing cost and tolerance-cost of quality loss models; we can use Simulated Annealing method to optimize these models.â— On the base of the model we have upbuild,we develop a software about tolerancing design of cam mechanism. This software has a brief interface and can be used with facility ; and it can help designer obtain the process and process tolerance of the part directly.
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