Selection optimization method of temperature measurement point combination for positioning errors of numerically-controlled machine tool under thermal effect

A positioning error, CNC machine tool technology, applied in program control, computer control, general control system, etc., can solve problems such as affecting calculation accuracy, large correlation of output signals, and increasing workload of measuring points, to simplify modeling Process, robustness and accuracy, the effect of saving temperature sensors

Active Publication Date: 2014-12-17
BEIJING UNIV OF TECH
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Problems solved by technology

[0004] However, too many temperature measuring points will not only increase the workload of arranging the measuring points

Method used

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  • Selection optimization method of temperature measurement point combination for positioning errors of numerically-controlled machine tool under thermal effect
  • Selection optimization method of temperature measurement point combination for positioning errors of numerically-controlled machine tool under thermal effect
  • Selection optimization method of temperature measurement point combination for positioning errors of numerically-controlled machine tool under thermal effect

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the drawings and implementation process.

[0025] Such as Figure 1-3 As shown, the selection and optimization method of the machine tool positioning error compensation modeling temperature measuring point of the present invention is a comprehensive selection method based on gray relational analysis and rough set theory, and is realized according to the following steps:

[0026] First, consider the factors related to the positioning error under the thermal effect, including the heat generated by the reciprocating motion of the moving parts of the machine tool, the heat generated by the motor, the heat transfer of various parts of the machine tool, and the influence of the ambient temperature. Based on this analysis, determine the location of the sensor in the experiment of collecting machine tool temperature data. . As shown in Table 1, the layout positions of the 29 sensors are detailed in Table...

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Abstract

The invention provides a selection optimization method of a temperature measurement point combination for positioning errors of a numerically-controlled machine tool under thermal effect. The selection optimization method is capable of identifying the influence of the temperature measurement point in each position on the positioning errors of the machine tool based on a grey correlation policy and a rough set theory. The selection optimization method comprises the following steps: k temperature sensors are mounted in special positions of the machine tool to measure the real-time temperature values, changing over time, of the machine tool during operation, and meanwhile, a laser interferometer is used for measuring positioning error values affected by temperatures; n sensitive temperature measurement point positions are screened out by use of the grey correlation policy; the positioning errors and the temperature data of the machine tool are preprocessed according to the principle of the rough set theory and a policy table is established; m feasible temperature point combinations are obtained by use of rough set reduction software; the optimal temperature measurement point combination of the machine tool is identified by virtue of comprehensive analysis. The selection optimization method of the temperature measurement point combination for the positioning errors of the numerically-controlled machine tool under the thermal effect is capable of solving the problem of excessive temperature measurement points or poor compensation model robustness in the positioning error compensation modeling process of the numerically-controlled machine tool.

Description

technical field [0001] The invention relates to a method for optimizing the combination of temperature variables used in the measurement of machine tool positioning errors and error compensation modeling in the cutting process of numerical control machine tools, belonging to the technical field of numerical control machine tool error analysis. Background technique [0002] The positioning accuracy of CNC machine tools is the position accuracy that the moving parts of the machine tool can achieve under the control of the CNC system. Generally speaking, it refers to the accuracy with which the machine tool positions the tool tip to the target point in the program. The machining accuracy of the machine tool is ultimately determined by the relative displacement between the tool and the workpiece on the machine tool. Therefore, reducing the positioning error is very important to improve the machining accuracy of the machine tool. [0003] Due to its good economy and high feasibi...

Claims

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Application Information

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IPC IPC(8): G05B19/404
Inventor 程强祁卓李凯刘志峰蔡力钢
Owner BEIJING UNIV OF TECH
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