The Research On Intelligent Fixture Design For Integration System Of CAPP/CAFD

Fixture is very important equipment in process of machine manufacturing because it can directly affect the quality of products and productivity and cost. So fixture designing is also a key portion in machine process preparative and manufacture. However, there are many questions in the design of fixture such as low efficiency, long period and high cost. It has been the " bottleneck " factor to restraining the development of modern manufacturing technology.In order to construct a production prepare system that can support the fast manufacturing of the products, the fixture design will be improved all things especially integrate automatization. As one kind of advanced manufacturing technology computer aided fixture design are applied for the production and utilizes the computer to design the fixture auxiliary.CAFD is divided into three stage: conceptual design, technical design and designed in detail. Conceptual design is the most portion in the computer-aided fixture design which influences the following design and is the crucial stage which influence the quality of the whole design project. Owing to the complexity of design which involves more restrictions, experiences, inkling and reusable, in the design of fixture on one hand the experience nature and fuzzy should be fully considered for the sake of set up effective reasoning means, on the other hand the effective search method is obtained with the past experiences to ensure the reusability of fixture. In this paper , basing on the conceptual design and the instance technology the main research done are as follow:Under the integrated system of CAPP/CAFD, the technical information model of parts is found according to the features of parts, enable the CAFD system to obtain the necessary geometry and process information from CAPPsystem directly, the integration of CAPP/CAFD is achieved.Though the analysis of the fixture comparability, the rational technology about instance is applied for the practice process of fixture design, at the same time the model for the instance of fixture is set up and express. So the reusability of fixture is improved and obtained the best result of search with the calculating of comparability.The design method based on function is studied in conceptual design and applied in the modeling of conceptual design. The expression of the function of fixture is researched, analyzed and resolved. Finally the function model of fixture is built.Depending on the feature as agency between function and structure, the mapped model of "Function-feature-structure" is present, depending on the analysis of the restriction of the fixture, the gather of standby features of the sub-function is obtained, the structure project of fixture is achieved at last. A prototype system is analyzed and developed and testified the previous key technology of fixture.