Numeric Control Self-programming System For Complex Surfaces

The mechanical part, with complex surfaces, is applied widely more and more, as national economy and mechanical industry's development. But shaping principle of complex surfaces is complicated, it is difficult to machine surfaces and to guarantee precision. So the numeric control self-programming system is widely used in numeric control machining surfaces. In this paper, numeric control self-programming for complex surfaces is studied on the base of studying machining complex surfaces. And it will break a new path for studying CAM system for numerical control machining complex surfaces.At present, the algorithm of minimal orientation-distance, which is gained by combining minimal orientation-distance principle with optimizing method of five points and genetic algorithms, is a way for NC machining helical surface. With the principle of minimal orientation-distance, the complicated question of calculating cutter-trace and checking cutter-interface is converted into the question of optimizing process of orientation-distance function between cutter's surface and workpiece's surface. So the difficulty of calculating is reduced. And the better effect has been gotten in practising. In this paper, this method will be made use of, and its applying will be enlarged. Our aim is to study numeric control self-programming system for complex surfaces, and exploit CAM software that we have the independent knowledge property right.In the paper, the principle of minimal orientation-distance, optimizing method of five points and genetic algorithms that is improved for some practical reasons are introduced at large. Then we calculate cutter-trace and check cutter-interference with it. Because we usually mill complex surfaces when machining it, milling is our main subject investigated. In studying, we find that flat end milling cutter, rose cutter and filled-end milling cutter can be expressed by the same mathematic model. Which makes it easer to exploit the system. The technology for shaping surfaces is required in studying machining surfaces. The cubic parameter spline function will be used to fit surfaces. In order to reduce the difficulty and narrow the scale of system, the surfaces that are input in function will be discreted as someprecision. Then we will get new surfaces with cubic parameter spline function. So, in fact, functions that are input into the system are of the same equation- cubic parameter spline function.In the paper, there are three parts in the numeric control self-programming system for complex surfaces, former processor, main processor and post processor. And the former two parts are subjects investigated. Workpiece-input module, cutter-input module and treating surfaces are included in former processor. There are calculating cutter-trace module, checking cutter-interference module and their sub-modules, such as optimizing method of five points module, genetic algorithms module.