The CAD Style Of The Sheet Metal Piece And Its Expansion

The article primarily studies the computer aided design style of the sheet metal piece , namely the CAD style of the sheet metal piece.In the paper, a multi-function , easily used and expandable CAD system was constructed with the help of technologies such as the mathematical modeling technology, object-oriented technology , parametrer-design technology ,geometry sculpt technology, and so forth. Based on the platform of the drawing software AutoCAD, with the development tool of ObjectARX , with C++ language to program, and by means of the Object-Oriented technology, the article builds a friendly-interface parameter-driven CAD system of the sheet metal piece, on the basis of analysing the surface intersected thread and the spreading curvilinear equation of the sheet metal piece .The designer only needs to input a goup of parameters to the dialog, then the CAD style can precisionly draw on the AutoCAD hardware working drawing and the evolve drawing of the sheet metal piece by chosen different scales. It finishes the parametric-design CAD style of hardware working drawing and spreading picture of the sheet metal piece and avoids mistakes availably which come from the manual work of the designer. In the paper, the author takes the three-way point of the cylinder with intersected axes as an example to show both realization method of the system and the parametrer-design course of the sheet metal piece.The style is fast , precise , easy to modified, and steady to function, so it is very useful in the production. Some important ideas and methods are presented in the system, accordingly it may be valuable and meaning to research and develop new CAD systems.