A method for measuring and identifying a geometric error source of a machine tool through workpiece error variation

Abstract

The invention discloses a method for measuring and identifying a geometric error source of a machine tool through workpiece error variation. The method comprises the following steps: carrying out finite element analysis considering force and thermal load on a precision machine tool with any series structure, extracting guide rail deformation data, performing calculating according to the guide raildeformation data to obtain a machine tool motion axis error, and performing calculating through deviation accumulation to obtain a tool nose point position error; Obtaining an actual machining path according to the tool nose point position error obtained in the previous step, and evaluating the precision of the machined part; Orthogonal test design is conducted, the two steps are repeated, the force and thermal load boundary conditions of the finite element model of the machine tool are changed, and multiple sets of guide rail deformation data and corresponding machining precision are obtained; On the basis of the last step, the mapping relation between the error change of the machined part and the geometric error source of the machine tool is obtained, the geometric error source of the machine tool is force and thermal load, and then the geometric error source of the machine tool is identified through the error change measurement of the machined part. The machining precision of the machine tool is improved, and an engineer is effectively helped to carry out error tracing.

Description

technical field [0001] The invention belongs to the technical field of precision machine tool processing accuracy guarantee and machine tool error traceability, and in particular relates to a method for identifying the geometric error source of a machine tool by measuring the error change of a workpiece. Background technique [0002] Machine tool precision performance is the basic index of machine tool design, which is comprehensively guaranteed through design, manufacturing and assembly. In recent years, my country's machine tool industry has developed towards high precision. The deformation caused by heat and force during machine tool processing has become more and more prominent. However, it is currently impossible to accurately trace the source of machine tool errors and lack reliable error identification methods. Predict and evaluate the machining accuracy of machine tools after deformation. Contents of the invention [0003] The purpose of the present invention is to...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for identifying the geometric error source of the machine tool by measuring the error variation of the workpiece to solve the problem that the error source of the machine tool cannot be accurately traced at present.

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