A Machining Error Compensation Method for Five Axis Linkage CNC Machine Tools Based on Least Squares Method
Due to the influence of many factors such as geometric error and thermal error of machine tool axis,there are often large errors in the actual machining process.In order to improve machining accuracy,a method of machining error compensation for five axis machine tool based on least square method was proposed.The transformation matrix from reference coordinate system to tool and from reference coordinate system to workpiece were constructed.Based on two kinds of transformation matrix,the synthetic error model of five axis CNC machine tool was constructed.At the same time,the nonlinear error compensation model of machine tool was established,the unit matrix was introduced,and the nonlinear parameter estimation of the parameters to be estimated was implemented by least square method to realize the machining error compensation of machine tool.The experimental results show that the machining error of the design method can be controlled within 0.01 mm,and the machining error can be greatly reduced by eliminating the influence of nonlinear fac-tors.ln the finishing stage,its leading position has been further consolidated.
NETL
NSTL
万方数据
