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Machine tool geometric accuracy optimization method based on value analysis method

An optimization method and geometric precision technology, applied in geometric CAD, computer parts, special data processing applications, etc., can solve problems such as low work efficiency, lack of functional and structural features, and high cost

Active Publication Date: 2018-05-18
BEIJING UNIV OF TECH
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Problems solved by technology

At present, many studies at home and abroad have focused on the optimal design of the precision distribution of machine tool geometric errors, but most studies still do not pay enough attention to the close relationship between precision and cost, and many studies still stay in the precision design of machine tools using traditional methods. Certain applicability, but its common shortcomings are mainly due to the lack of comprehensive, in-depth and meticulous consideration of the functions and structural characteristics of parts, processing difficulty and cost and other factors, low work efficiency and high cost

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  • Machine tool geometric accuracy optimization method based on value analysis method
  • Machine tool geometric accuracy optimization method based on value analysis method
  • Machine tool geometric accuracy optimization method based on value analysis method

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Embodiment Construction

[0122] Step 1: Establish geometric error model of precision machining center

[0123] Step 1.1 establishes the feature matrix of the precision horizontal machining center

[0124] The present invention takes the horizontal coordinate boring machining center JIG630 as an example to model and analyze its geometric error. topology see figure 1 , there are 30 geometric errors including positioning error, straightness error, angle error, etc. The symbols and descriptions of these 30 errors are shown in Table 1. The present invention uses a homogeneous transformation matrix for error modeling, and the homogeneous transformation matrix between the moving parts is shown in Table 2.

[0125] Step 1.2 Establish geometric error model of precision machining center

[0126] Suppose the coordinates of the tool forming point in the tool coordinate system are:

[0127] P t =(p tx p ty p tz 1) T (33)

[0128] The coordinates of the workpiece forming point in the workpiece coordin...

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Abstract

The present invention discloses a machine tool geometric accuracy optimization method based on a value analysis method. The method based on a value analysis method is characterized in that: a method for combining the global sensitivity analysis of machine tool machining accuracy and the geometric error correlation analysis is used to analyze each error item of the four-axis machining centers. Themethod comprises that: the geometric error modelling is carried out on the four-axis machine tool by using the homogeneous transformation matrix method; then the global sensitivity analysis and correlation analysis are carried out on the machining accuracy of the numerical control machine tool to determine the influence degree of each error item on the machine tool machining accuracy and determinethe function coefficient and the cost coefficient in the value analysis method; an accuracy distribution optimization model of the geometric error of the machine tool is established; and according tothe value analysis method, optimized design is carried out on the machine tool machining accuracy.

Description

technical field [0001] The invention relates to an analysis method for the geometric precision of a multi-axis machine tool, belongs to the field of machine tool precision design, and specifically relates to a method for optimizing the geometric precision of a machine tool based on a value analysis method. Background technique [0002] In the process of modern mechanical design and manufacturing, with the development of cutting-edge science and technology, the processing technology requirements for precision and ultra-precision instruments are getting higher and higher, and the processing accuracy of machine tools is even more important. In recent years, more and more attention has been paid to the machining accuracy of CNC machine tools, and breakthroughs have been made in related technologies. However, with the continuous improvement of machining accuracy, the machining cost of machine tools has also increased. Therefore, in order to meet market demand , it is necessary to...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06K9/62
CPCG06F30/17G06F18/23
Inventor 程强董立芳赵永胜李佳颖刘志峰
Owner BEIJING UNIV OF TECH
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