Research On NC Programming Technology Of Multi-axis Quenching Machine Tool For Large Automotive Covering Part Mould

The die of automobile cover panel is the basis technique equipment of the automobile industry,which must has a long service life of thousands times of usage.Automobile covering part die endures the major alternating load in the using process,so it’s an imminent problem to prolong its service life and ensure precision.Quenching the surface of automotive cover part die can make it have a better hardness and wear resistance,prolong its service life.Because of low efficiency and unstable quality,the traditional heat treatment equipment can’t meet the needs of automobile cover parts die’s quenching.As the automotive covering part molds have many complex three-dimensional surfaces,the multi-axis NC machine tool based on high frequency induction heating can improve the quenching efficiency and quality of automobile cover part die.Therefore,it’s necessary to research the NC quenching machine tool programming base on with and without mathematical model of the automobile covering part dies.In this dissertation,the main research contents are as follows:(1)Kinematics modeling of multi-axis high frequency induction quenching machine tool.In order to improve the quenching efficiency,the shape of the high-frequency induction quenching coil is designed to be the same as the die surface.In the quenching process of automobile cover part die,the plane trajectory can be quenched by using five-axis linkage mode.When the die surface trajectory is a complex space trajectory,in order to control the tangential direction of induction coil bottom and model surface in the same direction,it’s necessary to add a linkage axis base on the five-axis linkage.For the above case,the kinematics modeling of five-axis and six-axis linkage quenching machine tool kinematics model were set up respectively.For the kinematics solution of six-axis machine tool,the double vector method was adopted to solve the rotation angles of A,B and C axis.(2)Post-process research of multi-axis quenching machine tool.When the 3D solid model of automobile cover parts die is known,the CAD/CAM automatic programming technology is used.According to the quenching distance and the induction coil bias,this paper studies the post processing algorithm,and makes a reasonable choice of the rotation angle to ensure the continuity of the quenching trajectory.Combined with post-process algorithms and quenching process,the special post process software was developed,which can transform the cutter location point and cutter axis vector into NC program.The post processing algorithms is verified via VERICUT simulation of the quenching trajectory.(3)Teaching programming research of multi-axis quenching machine tool.Under the condition of the 3D solid model of automotive cover parts mould being unknown,based on PMAC open CNC system,the programming software module is developed,and the man-machine interface is programmed.Combined with the quenching process of the quenching trajectory is segmented and important teaching points are defined,to be completed by hand quenching CNC machine tool trajectory control unit of the manual teaching program,realize the quench machining path shown on the set to teach the acquisition,quenching parameters and automatic generation of quenching trajectory control program.(4)The quenching experiment of automobile panel die is carried out to verify the correctness of the post processing algorithm and the practicability of the teaching program.The results show that the multi axis quenching machine tool can be used to meet the requirements of surface quenching of the complex die.