CAM/CAPP/CAM Integrated System Development Based On Two-dimensional Graphic

CAD,CAPP and CAM integrated technology is an important part of modern manufacturing system and it is playing an increasingly important role in all aspects of product design and manufacturing. Now, Large-scale commercial CAD/CAPP/CAM intergrated system can afford a good solution for modern manufacturing. But it is limited in most minor enterprise because of it high price and high skill level demanded. This paper is aimed to develop a Smaller-scale and economical CAD/CAPP/CAM integrated system, which can meet the minor enterprise's need.This paper mainly researched how to develop a CAD/CAPP/CAM integrated system for NC lathe. The paper firstly analyzed each module's feature, function and composition of CAD/CAPP/CAM integrated system. Then put forwarded a solution that using AutoCAD as CAD module's support software and developing the CAPP and CAM module with programming language such as Visual C++. Next, the paper discussed how to develope document interface for DXF file after detailed analyzing CAD module. The paper putted forward an interpolation algorithm based on thrice non uniform B spline curve and also discussed how to realize characteristic identification from two dimension drawing of axis part.Automated process planning for revolving body is most important part for this software. After planning different tool path for NC turning to different shape of part, the system can select suitable tools, calculate and optimize cutting parameter automated through Man-machine Interface. The paper also discussed how to realize the automated generation process card in CAPP system. Combined with CAPP process date, the system realized NC automated programming by the way of CAD/CAM interactive graphic programming, and discussed the method of how to realize NC machining simulation.Finally, an example is given to explaine how to use this software to finish the related work of CAD/CAPP/CAM integrated system.This paper can offer a useful reference for the similar system development. And also lay the foundation for the further researcher.