Electric spindle thermal error active control method based on initial temperature maintaining strategy

Abstract

The invention discloses an electric spindle thermal error active control method based on an initial temperature maintaining strategy. The method includes the steps of firstly, establishing an electricspindle thermal error active control system; secondly, determining the number and location of temperature rise sensitive points of an electric spindle and the number of cooling pipes; thirdly, according to the initial temperature maintaining strategy, establishing the functional relationship between the temperature value of cooling liquid output and the relative temperature of the current temperature of the temperature rise sensitive points and the initial temperature of the temperature rise sensitive points. According to the method, with the aim of maintaining the initial temperature of thetemperature field of the electric spindle, the temperature field of the electric spindle does not change obviously from start to finish, and thus the generation of thermal errors is suppressed; through differential closed-loop control over the temperature field of the electric spindle structure, the dependence of the electric spindle on a constant-temperature environment is reduced, the environmental adaptability of the electric spindle is improved, the temperature of the electric spindle structure is stably controlled in a non-constant-temperature environment, and thus the precision, accuracyand robustness of the electric spindle are improved.

Description

technical field [0001] The invention relates to the technical field of numerical control machine tools, in particular to an active control method for electric spindle thermal errors based on an initial temperature maintenance strategy. Background technique [0002] In recent years, the rapid development of my country's manufacturing industry has put forward higher and higher requirements for the processing performance and comprehensive precision level of high-end CNC machine tools, making the thermal balance design and thermal dynamic characteristics research of machine tools become the key to ensure the high-precision and high-precision retention of high-end CNC machine tools. Key factor. Studies have shown that in the processing of precision and ultra-precision CNC machine tools, the machine tool errors caused by thermal effects generally account for about 40%-70% of the comprehensive errors. How to effectively improve the thermal characteristics and minimize the thermal e...

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Problems solved by technology

[0003] The document with the application number 201310115537.8 discloses an active control system and method for the temperature field of a precision machine tool, which provides a system composed of cooling system-signal acquisition module-precision spindle and other hardware based on a multi-loop differential circulation cooling system, and does not provide corresponding method

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