Shoe Last Profiling Cnc Programming Technology And System Development

With the rapid development of CAD/CAM technology, great change takes place in shoe-last making industry. It can greatly improve the process of shoe last making, shorten the production life cycle of shoe last and make the process more efficient. As an efficient machining process, NC copying machining has become a good choice to improve the efficiency of shoe last production. Its principle is very similar to the traditional shoe last machining. This new machining method takes advantage of the old, but avoids the disadvantage. However, for the complexity of shoe last surface and particularity of shoe last NC machining, it is difficult to generate NC program for shoe last by using general CAD/CAM software. Under such circumstance, NC programming method of shoe last based on measuring data points becomes a choke point of the development of shoe last NC copying machining. Therefore, how to produce NC program based on shoe last measuring data points and how to develop shoe last CAM program must be studied. It makes great sense in enlarging the application area of NC copying machining, improving the efficiency of shoe last production and enhancing the market competitive ability of shoe last making companies.Based on the project funded by Zhejiang Province Technology Foundation in 2002-"Development of Shoe Last CAD/CAM System and NC Machine Tool", this thesis makes a deep research in developing NC programs from the shoe last measuring data points. The main content of the thesis is presented as follows:According to the requirement of shoe last NC programming and machining simulation, Shoe Last NC Machining Model (SLNCMM) is introduced and created as an object of the research. For the complexity of shoe last surface, Discrete Modeling method for shoe last is presented. Thus the problem of how to describe shoe last surface is solved simply and effectively. Briefly introduces the method of measuring data points acquisition, processing and model reconstruction; according to machining process requirements, shoe last head and tail models are introduced; and the uniting method is also presented; in order to evaluate the reconstructed shoe last model, the precision evaluation method and measures of error controlling is introduced. On the basis of shoe last NC machining principle and projection method, a new tool-path generation algorithm-"the Nearest Contacting Point Method (NCPM)" is presented; this method is simple, high efficiency and exempt from collision checking; a coordinate conversion algorithm of cutter points is also introduced in order to convert cutter location source file to NC program. In order to verify the shoe last NC program, explores how to conduct virtual machining process with VERICUT tool; the NC program verification process reduces the time and material cost.is<> Analyzes the requirements of Shoe Last CAM system development and then put forwards the system architecture; on the basis of the previous research experience, a Shoe Last CAM system with Shoe Last NC Machining Model (SLNCMM) oriented is developed successfully.Although the research of shoe last NC programming method in this thesis is aimed to shoe last measuring data points, it can also be applied to shoe last solid model. In sum, the development of Shoe Last CAM system can not only solve the problem of NC programming of shoe last based on both measuring data points and solid model, but also enlarge the application area of shoe last NC coping machining.