当切削金属材料时,刀具与被切削材料就形成了一对自然热电偶,刀具和被切削材料的接触处是自然热电偶的工作端(亦叫热端)。工作端的温度是引起刀具磨损的主要因素之一,为了减少刀具磨损,提高刀具耐用度,就必须降低切削温度。为此,就必须测出切削区的瞬时切削温度值。测量切削区平均温度的方法很多,其中最简便又最常用的是自然热电偶法,但在采用这种方法时,事先一定要将自然热 When cutting a metal material, the tool and the material to be cut form a pair of natural thermocouples. The contact point between the tool and the material to be cut is the working end (also called hot end) of the natural thermocouple. Working temperature is one of the main factors that cause tool wear. In order to reduce tool wear and improve tool durability, it is necessary to reduce the cutting temperature. For this purpose, the instantaneous cutting temperature of the cutting zone must be measured. There are many ways to measure the average temperature in the cutting zone. Among them, the simplest and most common one is the natural thermocouple method. However, when using this method, the natural heat