Analysis and Evaluation of Geometric Error Modeling for Four-Axis Linkage Machine Tools
Machine geometric errors are one of the main factors affecting the machined workpiece accuracy,analyzing and evalua-ting them can improve the workpiece machining accuracy.Taking a four-axis vertical machining center as the research object,the impact of machine tool geometric errors on spatial accuracy was analyzed.The key error terms were identified to improve the efficiency of ma-chine tool accuracy compensation.The geometric error model of the machine tool was established using the D-H homogeneous coordinate transformation theory.The Latin hypercube sampling and Sobol global sensitivity analysis methods were used to evaluate the machine tool geometric errors and identify the key error terms.Finally,the reliability of the identification results was verified by comparing the opti-mized model obtained from identification with the original model.So higher machine accuracy can be obtained by compensating the key error terms.
万方数据
维普
