On-line Compensation Method and System for Thermal Error of CNC Machine Tool

Abstract

The invention discloses an online compensation method and system for thermal error of a numerical control machine tool; collecting temperature data of key measuring points of the numerical control machine tool, calculating the theoretical thermal error value of the numerical control machine tool according to a multiple linear regression thermal error model, calculating the compensation value and judging whether the set value is satisfied Compensation threshold upper and lower limit range. The present invention builds a multivariate linear regression thermal error model, and embeds it as a thermal error online compensation subunit of a CNC machine tool into the human-computer interaction interface of the panel control unit, without requiring an external compensator, which greatly improves the versatility of the system; At the same time, the compensation value of CNC machine tools is calculated by using fuzzy cluster analysis method and multiple linear regression theory, and the external coordinate transformation method is used to perform online compensation, which is convenient and real-time.

Description

technical field [0001] The invention belongs to the technical field of error compensation of numerical control machine tools, and in particular relates to an online compensation method and system for 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 machining technology, higher requirements are put forward for the precision of CNC machine tools and machining centers. Among the various error sources of the machine tool, geometric errors and thermal deformation errors have a greater impact on the machining accuracy of the machine tool, and are the main factors affecting the machining accuracy of the mach...

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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