Method for modeling location-dependent geometric error item of numerical control machine tool

A technology of geometric error and numerical control machine tools, applied in the field of polynomial modeling of position-related geometric error terms optimization of numerical control machine tools, to achieve the effects of improving versatility, realizing automation and programming, and strong robustness

Active Publication Date: 2017-05-31
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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  • Method for modeling location-dependent geometric error item of numerical control machine tool
  • Method for modeling location-dependent geometric error item of numerical control machine tool
  • Method for modeling location-dependent geometric error item of numerical control 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 method for modeling the location-dependent geometric error item of a numerical control machine tool, which belongs to the technical field of numerical control machine tool machining. The method comprises the following steps: determining the n-order polynomial form of the location-dependent geometric error item of a numerical control machine tool according to the property of the location-dependent geometric error item; according to the discrete data of the location-dependent geometric error item of the numerical control machine tool, getting an n-order polynomial coefficient calculation matrix M based on the principle of least square fitting, and calculating the coefficients of the n-order polynomial; calculating a series of polynomials from first-order to mth-order polynomials according to the discrete data of the location-dependent geometric error item of the numerical control machine tool, wherein the highest order m is set to half of the discrete data of the geometric error item; calculating the F values of first-order to m-order polynomials through a regression analysis F-test method; and finding out the maximum F value through comparison, and selecting the polynomial corresponding to the maximum F value as an optimized polynomial model of the location-dependent geometric error item of the numerical control machine tool. The method is mainly used to realize automated and programmed machine tool comprehensive error modeling.

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 Applications(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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