Research On Automatic Programming System For CNC Milling Non-circular Gear

The research of non-circular gear CNC milling processing automatic programming system is a sub-topic for scientific and technological project which is a complex CNC Machine including turning,milling and gear processing in Ningxia Autonomous Region. The sub-topic sloves the difficult problem which is about Non-circular gear automatic programming. The research meets the current CNC machining technology development which trends to composite, multi-functional, professional and economization.The paper is based on Complex CNC Machine including turning,milling to mill non-circular gears, focusing on three steps to research the Non-circular gear CNC milling processing automatic programming system.The first step is that analysis the non-circular gear CNC milling processing automatic programming system in theory. The way is that studying the structure of non-circular gear automatic programming, processing flow chart and analysising the function of each module.Then analysis mathematical model of non-circular gear and milling processing principle of non-circular gears in depth which includes the knife of CNC milling processing , the cause of undercut and the way to comprehensive evaluing the accuracy of non-circular gear.The second step is the specific design of automatic programming system. Using Pro / E secondary development tool pro / toolkit and Microsoft VC + +6.0 to design parametric model of the non- circular gear base on the Pro / E 4.0 platform.Then integrating the programming system module by using gear expert technology and CAD / CAPP / CAM integrated technology including using the technology of COM Programming to connect different modules.The third step is to verify that the non-circular gear CNC milling processing automatic programming system can generate high-precision CNC machining program of non-circular gears. First is to describles the design of the system interfaceand specific operations, then using the second oval gear as example to achieve miling processing artomatic programming which includes tool path simulation.processing simulation and generating the required CNC machining NC program. Thelast is that using the programming system in Complex CNC milling machine to the virtual processing precision analysis of non-circular gear.