Digital controlled lathe thermal error measuring compensation system and method

Abstract

The invention discloses a digital controlled lathe thermal error measuring compensation system and method. The system comprises an eddy current displacement sensor, a platinum resistor temperature sensor, a laser interferometer, a displacement collecting and processing module, a thermal error compensation module and a PC. The platinum resistor temperature sensor measures the temperature of a lathe body heat sensitive point, the eddy current displacement sensor measures heat deformation of a spindle, the laser interferometer measures the locating error of a feeding system, and the spindle and a feeding shaft system are subjected to real-time thermal error comprehensive modeling. The thermal error compensation module compensates for axial heat expansion and radial heat inclination of a spindle workpiece in real time according to the temperature of the heat sensitive point and the coordinate value of a tool. The coupling problem of the digital controlled lathe spindle and the feeding shaft thermal error is solved, the thermal error can be compensated for in real time, and the machining precision of a digital controlled lathe is improved.

Description

technical field [0001] The invention relates to the technical field of numerical control machine tools, in particular to a thermal error measurement and compensation system and compensation method of a numerical control lathe. Background technique [0002] Problems such as poor accuracy retention, one of the key factors affecting the accuracy of machine tools, thermal error accounts for 40% to 70% of the overall error of the machine tool, and the proportion is even larger for high-precision CNC lathes. Thermal error compensation is the most economical and effective means to solve the thermal problems of machine tools, and it is of great significance for improving the precision of CNC machines and improving the performance of machine tools. During the working process of the CNC lathe, due to the heat generated by the friction of the spindle system bearing, the thermal drift of the spindle will occur. The frictional heat generated by the screw nut pair of the feed system and t...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to aim at the coupling problem of the thermal error of the spindle and the feed axis of the CNC lathe, and propose a thermal error measurement and compensation system and compensation method for the CNC lathe, and carry out real-time comprehensive modeling of the thermal error of the spindle and the feed axis system to solve the problem. The axial thermal expansion and contraction of the CNC lathe and the radial thermal tilt thermal error related to the temperature and the current position of the tool can improve the machining accuracy of the CNC machine tool

Images