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Recognition method of critical geometrical error source of machine tool

An identification method and key technology, applied in the direction of electrical program control, digital control, etc., can solve the problems of insufficient research depth of machine tool error traceability, lack of machine tool error sensitivity analysis key parameter identification method, and lack of research and methods.

Inactive Publication Date: 2013-04-10
BEIJING UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In terms of sensitivity analysis, existing studies have established statistically based mathematical models of sensitivity coefficients for parallel mechanisms and parallel machine tools. Sensitivity Analysis of Machine Tool Errors and Identification of Key Parameters with General Versatility

Method used

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  • Recognition method of critical geometrical error source of machine tool
  • Recognition method of critical geometrical error source of machine tool
  • Recognition method of critical geometrical error source of machine tool

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Experimental program
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Embodiment Construction

[0160] Concrete implementation steps of the present invention are as follows:

[0161] The first step is to establish a spatial machining accuracy model based on the multi-body system theory

[0162] According to the multi-body theory, the machine tool is abstracted into a multi-body system according to the structure and motion characteristics of the machine tool. Using the simple topology structure and low-order body array in the multi-body theory, describe the relationship between the various parts of the machine tool; then, establish a generalized coordinate system in the multi-body system, and use the homogeneous transformation matrix to convert the errors between the various parts of the machine tool The coupling relationship is expressed; the characteristic matrix and motion equation of the relative motion between two adjacent bodies in the machine tool are derived, so as to establish the precision model of the machining center. The specific implementation steps are as f...

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Abstract

The invention discloses a recognition method of a critical geometrical error source of a machine tool and belongs to the technical field of machine precision designing. The recognition method of the critical geometrical error source of the machine tool is characterized by comprising the steps that the machine tool is abstracted into a multi-body system according to the structure and motion characteristics of the machine tool, relevance of parts of the machine tool is described by a topological structure and a low-order body array, a generalized coordinate system is built in the multi-body system, coupling relationship of error amounts of parts of the machine tool is described by a homogeneous transformation matrix, a characteristic matrix and a motion equation of the relative movement between two adjacent bodies of the machine tool are elicited, a precision model of a machining center is built, an ordinary mathematical model used for error sensitivity analysis of a four-shaft machine tool is built with a matrix differential method according to the precision model of the precision horizontal machining center, influence degrees on the whole space error of all error elements are compared by calculating the geometrical error sensitivities of all parts, and finally the critical error source influencing the machining precision of the machine tool is recognized.

Description

technical field [0001] The invention relates to the field of machine tool error analysis and precision design, and more specifically relates to the identification of key geometric error source parameters that have a relatively large impact on the machining precision of machine tools. Background technique [0002] As aerospace, military, shipbuilding, automobile and other industries have higher and higher requirements for precision parts processing, the precision performance of machine tools is becoming more and more important. Various types of errors that affect the overall machining accuracy of machine tools mainly include geometric errors, thermal errors, load errors, servo errors, and interpolation errors of machine tool components. The geometric error of the machine tool is reflected in each component, and will eventually be reflected in the machining error of the workpiece being machined. In the traditional machine tool design, the accuracy grade of each component is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/18
Inventor 程强肖传明顾佩华鹿怀庆蔡力钢
Owner BEIJING UNIV OF TECH
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