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

A technology for geometric errors and workpieces, which is applied in the field of identifying the source of geometric errors of machine tools through the measurement of workpiece errors

Inactive Publication Date: 2019-04-16
XI AN JIAOTONG UNIV
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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 measurin

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

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[0026] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0027] Aiming at the problem that the current source of machine tool error cannot be accurately traced, the present invention provides a method for identifying the source of machine tool geometric error through the measurement of machining part error variation. The method includes machine learning to obtain the mapping relationship between machining part error variation and machine tool geometric error. Error identification and traceability.

[0028] The process of the method for identifying the source of machine tool geometric error by measuring the variation of machining part error provided by the present invention is as follows: figure 1 As shown, methods such as the least square method to evaluate the accuracy of the processed parts and machine learning are included. According to the error traceability steps shown in the flowchart, the machine tool geometri...

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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...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23G06F2119/06G06F2119/08
Inventor 郭俊康洪军刘奕颖南凯刚
Owner XI AN JIAOTONG UNIV
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