| Sheet metal parts are widespread applied to aircraft structures. In general, sheet metal parts in modern aircrafts have free-form surfaces and complicated shapes, which lead to heavy design duty, long design period, and difficult operations in sheet metal mold design. Although, the CAD technology has been widely used, there is still lack of CAD tool to meet the specific requirements of sheet metal mould designers. Aiming at the enterprise requirements, in consideration of both efficiency and quality improvement,rapid design technology and its application in sheet metal mould design are researched. The main research methods and results are as follows:(1)Surface defect detection, reparation and extension technologies are studied. the types of defects and their possible causes on surfaces are analyzed in detail. Topological defect detection and reparation methods are given. And algorithms for surface hole and boundary rapid filling, and surface rapid extending are proposed and implemented.(2)Parametrical modeling technology of the standard parts used in sheet metal moulds are studied. A standard part library with parametric assembly features is constructed. Retrieve and instantiation of the standard parts are implemented.(3)Engineering drawing setting for sheet metal mould is researched, and rapid initialization of engineering drawing environment is realized. Management of 3D attribute of sheet metal mould is studied comprehensively. Mapping of non-geometrical information based on 3D attribute definition to 2D engineering drawing, and subsequently automatic update of mould inspection points are implemented. The above work provides efficient tool to achieve rapid design of engineering drawings. |
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