Numerically-controlled machine tool thermal error on-line compensation method and system

Abstract

The present invention discloses a numerically-controlled machine tool thermal error on-line compensation method and system. The numerically-controlled machine tool thermal error on-line compensation method comprises the steps of: acquiring key measuring point temperature data of a numerically-controlled machine tool; calculating a theoretical thermal error value of the numerically-controlled machine tool according to a multiple linear regression thermal error model; calculating a compensation value and judging whether the compensation value meets a set upper-lower limit range of a compensation threshold value. According to the numerically-controlled machine tool thermal error on-line compensation method, the multiple linear regression thermal error model is built and is used as a thermal error on-line compensation subunit of the numerically-controlled machine tool to be embedded into a human-computer interaction interface of a panel control unit, and an external compensator is not needed, thereby greatly improving universality of the system; at the same time, a fuzzy clustering analysis method and a multiple linear regression theory are used to calculate the compensation value of the numerically-controlled machine tool, and an external coordinate transformation mode is adopted for performing on-line compensation, thus convenient operation and good real-time performance are achieved.

Description

Technical field [0001] The invention belongs to the technical field of error compensation for numerical control machine tools, and in particular relates to a method and system for online compensation of thermal errors of numerical control machine tools. Background technique [0002] With the development of science and technology, mechanical manufacturing technology is developing in the direction of high speed, high precision and intelligence, which puts forward higher requirements for mechanical processing. With the rapid development of automation in the production and processing process and the wide application of precision processing technology, higher requirements are put forward for the accuracy of CNC machine tools and processing centers. Among the various error sources of machine tools, geometric errors and thermal deformation errors have a greater impact on the machining accuracy of machine tools, and are the main factors affecting the machining accuracy of machine tools. ...

AI Technical Summary

Problems solved by technology

After searching the prior art, it is found that the following problems are common: 1) It needs an external compensator and the assistance of a personal computer to complete the compensation of the error, the hardware cost is large, and the implementation process is relatively complicated

2) The compensation method based on the secondary development of the human-machine interface uses Siemens’ own temperature compensation module to implement compensation. However, the secondary development of the human-machine interface uses the paid development kit provided by Siemens, which relies heavily on Siemens. At the same time, Siemens has its own The temperature compensation module is a paid optional module, not all Siemens CNC systems have a temperature compensation module, which is not universal

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