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A real-time compensation method for thermal elongation error of CNC machine tool spindle

A technology of real-time compensation and CNC machine tools, applied in the direction of program control, computer control, general control system, etc., can solve the problems of real-time compensation not involving the thermal elongation error of the main shaft, so as to improve the adaptability of working conditions and ensure the real-time compensation , the effect of reducing complexity

Active Publication Date: 2018-10-16
DALIAN UNIV OF TECH
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Problems solved by technology

However, none of the above methods involves the real-time compensation of the thermal elongation error of the spindle

Method used

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  • A real-time compensation method for thermal elongation error of CNC machine tool spindle
  • A real-time compensation method for thermal elongation error of CNC machine tool spindle
  • A real-time compensation method for thermal elongation error of CNC machine tool spindle

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Embodiment Construction

[0027] The implementation process of the present invention will be described in detail below in conjunction with the accompanying drawings and technical solutions.

[0028] The machine tool selected in the embodiment is a precision vertical machining center, the maximum spindle speed is 6000r / min, the axis of the spindle is consistent with the Z axis, and the positioning accuracy of the linear axis is 0.01mm. Two temperature sensors Pt100, measuring range 10℃~100℃, output voltage signal 0V~10V; displacement sensor ZX-EM, measuring range 2mm, linearity ±0.5%, output voltage signal -5V~+5V. The ambient temperature is 18°C ​​to 23°C.

[0029] The real-time compensation process for the thermal elongation error of the CNC machine tool spindle is as follows: figure 1 As shown, the specific steps of the method are as follows:

[0030] In the first step, the spindle temperature sensor S is respectively arranged near the front bearing of the spindle 3 and on the spindle motor 1 1 and ...

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Abstract

The invention relates to a numerically-controlled machine tool spindle thermal extension error real-time compensation method and belongs to the numerically-controlled machine tool machining field. According to the method, a temperature sensor is used to detect the temperature of a thermal critical point in real time under the current rotation speed of a spindle, and characterization temperature is calculated according to the degree of influence on the thermal extension error of the spindle caused by the temperature of the thermal critical point; spindle thermal extension error compensation amount under a current thermal state is calculated; system variables of the machine tool external coordinate system offset function of a linear shaft of which the axis is consistent with the axis of the spindle are updated according to a certain period; and the real-time compensation of the thermal expansion error of the spindle is completed. According to the numerically-controlled machine tool spindle thermal extension error real-time compensation method of the invention, a plurality of temperature variables are converted into one characterization temperature according to the degree of the influence on the thermal extension error of the spindle caused by the temperature of the thermal critical point, and therefore, temperature field information overlapping can be eliminated; and a method according to which a PLC is used as a compensation program carrier is adopted, so that the real-time performance of compensation can be ensured, and the complexity of a compensation process is decreased; and the compensation process is simple and fast and has high real-time performance.

Description

technical field [0001] The invention belongs to the field of numerical control machine tool processing, and in particular relates to a real-time compensation method for the thermal elongation error of the main shaft of the numerical control machine tool. Background technique [0002] High-end precision CNC machine tools are widely used in aerospace, electronics, automobiles and other fields, and are the basic tools for the processing and manufacturing of key parts of high-end equipment. The spindle is the core component that provides the active power for machining on the CNC machine tool. During the operation of the machine tool, the thermal error of the machine tool caused by the thermal deformation of the structure is an important factor that cannot be ignored. Studies have shown that thermal errors account for up to 70% of the total errors of machine tools. Among them, the thermal elongation error of the spindle is particularly prominent. The error is along the axis of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/35408
Inventor 刘海波韩灵生吴嘉锟李宽陈松孙波王永青郭东明
Owner DALIAN UNIV OF TECH
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