Detection and Impact Analysis of Spindle Thermal Offset Characteristics
The thermal offset error of the spindle directly affects the positioning accuracy and processing quality of CNC machine tools.This article focuses on the testing of temperature rise and thermal offset errors of CNC machine tool spindles.Magnetic temperature sensors and laser testers are used to measure the temperature changes and thermal drift errors in various directions of the spindle,understand the actual working conditions of the machine tool spindle,collect spindle temperature rise data and thermal balance time,as well as the spatial state of spindle thermal offset,and analyze the relationship between spindle temperature rise and thermal offset errors over time.The experimental results show that the temperature rise of the spindle is positively proportional to the increase in the number of test groups,and the maximum temperature rise at high speed is 12.65℃,which is significantly higher than that at low speed,which is 8.55℃;the thermal offset error in each direction of the spindle increases with temperature rise,with more severe error changes at high speeds:the maximum thermal offset at high and low speeds is 35.37 μm and 15.26 μm respectively.The results of this study provide data support for exploring the causes of errors and optimizing compensation designs in the future.
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