Radial Thermal Error Modeling And Compensation Of CNC Worm Wheel Gear Grinding Tool

The worm gear grinding machine is the main equipment for batch finishing of small and medium modulus,which is widely used in the manufacture of automobile transmission gears.In the grinding process of worm wheel,the thermal error caused by the machine tool has great influence on the machining accuracy of the gear.Thermal error accounts for the largest proportion of the error sources in the worm gear grinding machine,in which radial thermal error directly affects the M value of the grinding gear of the worm wheel,and is the key factor of thermal error.Therefore,this paper improves the accuracy and efficiency of worm gear grinding machine by radial thermal error modeling and compensation.It has theoretical significance and engineering application value.Main content and study method is as following.(1)According to the 3D simplified model of worm wheel grinding machine,the temperature field of worm gear grinding machine is obtained by ANYSYS.Use thermal correlation theory of machine tool,analyze thermal sources analysis of worm wheel grinding machine and the causes of radial thermal error.(2)Analyzed temperature flied and displacement flied,The fuzzy C means clustering algorithm and correlation theory are used to optimize the temperature variables.Set up measurement system of thermal error measurement based on LabVIEW software and have experiment in practice processing.(3)Determine data centers and smoothing factor via adjust weights algorithm,use recursive least squares algorithm get output layer weights.The radial thermal error model of worm wheel grinding machine is established,that is FPNN neural network radial thermal error model.Through comparing with other models,the stability and the feasibility of FPNN model were verified.(4)Propose a thermal error compensation method based on modify the NC code.After the radial thermal error compensation,the validity of the compensation method is verified.