动态人工热电偶法

Research on Dynamic Artificial Thermocouple Method

结合半人工热电偶法和人工热电偶法的特点,提出了一种新的测量切削温度的方法——动态人工热电偶法.该方法具有人工热电偶法无需二次标定、能够测量绝缘体的切削温度以及半人工热电偶法能够直接测量切削区切削温度的特点.通过比较相同加工条件下新测量方法和半人工热电偶法分别测量的铝合金板铣削过程中切削区的温度值,验证了新方法的测量准确性.试验表明:动态人工热电偶法与半人工热电偶法的测量结果较为吻合.对于热电势,平均绝对误差小于2.5%,标准差小于0.9mV;对于温度值,平均绝对误差小于3%,标准差小于14℃.此外,利用动态人工热电偶法测量了环氧树脂切削区的温度变化情况,证明该方法能够有效测量绝缘体切削区的切削温度.

Combining the characteristics of semi-artificial thermocouple method and artificial thermocouple method, a new method of measuring cutting temperature is presented and named dynamic artificial thermo- couple method. This method has the advantages of artificial thermocouple method without secondary cali- bration and cutting temperature of insulator can be measured, and it has the advantaget of semi-artificial thermocouple method that cutting temperature in cutting zone can be measured directly. By comparing temperatures in cutting zone during the process of milling aluminum panels measured by the new method and semi-artificial thermocouple method separately under same machining conditions, the measure accuracy of the new method is verified. The experiment demonstrates that the temperature measurements by using dynamic artificial thermocouple method are closed to those results by using semi-artificial thermocouple method. For thermocouple potential, the mean absolute percentage error is less than 2.5% and the stand- ard deviation is less than 0.9 mV. For temperature values, the mean absolute percentage error is less than 3% and the standard deviation is less than 14 ℃. Furthermore, temperature variation in the cutting zone of epoxy resin is measured by using dynamic artificial thermocouple method and it is proved that this method can be used to measure cutting temperature in the cutting zone of insulator effectively.