Abstract: To solve problems of complex cabling and temperature sensor placement optimization for CNC machine tool spindle thermal error by wired monitoring method, a new layout method of measuring points is proposed by golden section of heat sensitive area and the temperature distribution monitoring and wireless signal transmission are achieved by using temperature sensor tag. The temperature sensor tag is designed by integrating digital temperature sensor DS18B20, microprocessor MSP430, radio frequency communication module NRF905. The temperature signal and tag address information were transmitted to computer by radio frequency communication, the communication protocol is simple and energy consumption is low. According to the finite element analysis model of the machine spindle, the heat sensitive area is determined by golden section method. It can solve problems of traditional experience method such as data redundancy, unreliability, uncertain optimal test conditions and etc. The monitoring system is built by using temperature sensor tag and laser displacement sensor, and the thermal error experiment was done by the orthogonal test. The results of range analysis and regression analysis show that the system has the characteristics of reliability, strong real-time processing capability, and the regression model also has good prediction ability.

Key words: golden section method, orthogonal test, spindle, temperature sensor tag, thermal error