Research On Simulation And Algorithm Of Automatic Generation Of Interference-free Tool Path Of Freeform Surfaces With Curves Of Cross Sections In NC

The generation of the tool path means that by the geometrical models of parts, according to the adopted machines , the tools , the cutting patterns , the cutting allowance and etc., under some principles, the calculation of the cutter location was done and the tool path was generated. The superiority and inferiority of the algorithm of automatic generation of the tool path will affect the speed and quality of the generation of the tool path, even to affect the working efficiency of parts.In NC, the machining of the freeform surfaces is one popular and important work. Because of the complex shapes, near the sunken region of the freeform surfaces and the united surfaces, the vertical vectors of the surfaces changed so much that the interference between the tools and the parts is easy forming while machining. So the resolution of the interference in the generation of the tool path is unable to avoid. The perfect resolution of the interference can solve not only the over-cutting region but also the under-cutting region effectively.The method of curves of cross sections is one of the methods to generate the tool path. It includes: the method of curves of cross sections through CC route and the method of curves of cross sections through CL route. It can freely control the cutting-line, and can generate the average tool path. It is suit to the machining of freeform surfaces.In this paper, with the example to machining the freeform surfaces by the ball tool, studied the method of curves of cross sections deeply, and added the idea and way of the quickly-interference-checking and solving to this method, finally extracted a new way-the interference-free tool path method of curves of cross sections. Moreover, simulated the cutting process with MasterCAM software. The calculation of this method is less relatively, the speed of this method-2-is quick and the quality of the tool path of this method is ideal, at the same time, mis method can find the under-cutting region in machining for the following process.