A Modeling Method for Position-Dependent Geometric Error Term of CNC Machine Tool

A technology of geometric error and CNC machine tools, applied in the field of polynomial modeling for the optimization of position-related geometric error items of CNC machine tools, to achieve the effects of automation and programming, strong robustness, and improved versatility

Active Publication Date: 2019-03-22
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0005] The purpose of this invention is to provide a kind of modeling method of position-related geometric error term of CNC machine tool, which can effectively solve the problem of establishing the mathematical expression of geometric error term

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  • A Modeling Method for Position-Dependent Geometric Error Term of CNC Machine Tool
  • A Modeling Method for Position-Dependent Geometric Error Term of CNC Machine Tool
  • A Modeling Method for Position-Dependent Geometric Error Term of CNC Machine Tool

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Embodiment Construction

[0054] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0055] attached figure 1 Shown is the flow chart of the modeling method of the position-related geometric error item of the numerical control machine tool of the present invention. attached figure 2 Shown is a schematic diagram of the structure of a five-axis CNC machine tool, with image 3 Shown is the linear error δ in the x-axis direction of the X-axis xx The discrete data of figure 2 The linear geometric error δ of the X-axis of the machine tool in the x-direction xx An example is used to illustrate the modeling method of the position-related geometric error item of the numerical control machine tool of the present invention.

[0056] Step 1. According to the nature of the position-related geometric error term of the numerical control machine tool, determine the n-degree polynomial form of the position-related geometric error term of...

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Abstract

The invention discloses a modeling method for position-related geometric error items of a numerical control machine tool, belonging to the technical field of numerical control machine tool processing. Including: according to the nature of the position-related geometric error term of the CNC machine tool, determine the n-degree polynomial form of the position-related geometric error term; according to the discrete data of the position-related geometric error term of the CNC machine tool, the n-degree polynomial coefficient calculation matrix M is obtained by using the least square method fitting principle, Calculate n-degree polynomial coefficients; combine the discrete data of CNC machine tool position-related geometric error items to calculate a series of polynomials from 1 to m-degree, the highest degree m is set to half the number of discrete data of geometric error items; calculate according to the regression analysis F test method The F value of a series of polynomials of degree 1 to m; compare and find the maximum F value, and select the polynomial corresponding to the maximum F value as the optimized polynomial model of the position-related geometric error item of the CNC machine tool. It is mainly used to realize the automation and programming of comprehensive error modeling of machine tools.

Description

technical field [0001] The invention relates to the technical field of numerical control machine tool processing control, in particular to the optimization polynomial modeling technology of position-related geometric error items of numerical control machine tools. Background technique [0002] High-precision machining is an inevitable trend in the development of CNC machine tools. Geometric error is one of the main error sources of CNC machine tools in the process of part processing. The characteristics of high repeatability, good system and easy measurement of geometric error make geometric error compensation an important tool to improve the accuracy of machine tools. one of the important measures. Geometric error modeling is the basis of error compensation, and the establishment of mathematical models of geometric error items is an important part of error modeling and compensation, which is directly related to the accuracy of error compensation. [0003] According to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/32352
Inventor 付国强高宏力宋兴国曹中清
Owner SOUTHWEST JIAOTONG UNIV
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