Experimental investigation of chip-back surface temperature base on cutting parameters

It is known that temperature between tool-chip interface due to the heat generated during machining of materials has an effect on tool life and surface quality. Researches on the methods for measurement of the temperature have been continuously carried out. In this work, measurability of chip-back temperature using embedded thermocouple method, one of the most commonly used methods, was investigated. For this purpose, machining tests were carried out on AISI 1117 steel and the influences of cutting speed, feed rate and depth of cut on the chip surface temperature variation was examined. In addition, a correlation was made between the cutting forces and the temperature. For measurement of chip-back temperature, a 1.5 mm diameter K type thermocouple (Ni-NiCr) was inserted into the predrilled hole on the tool holder. The obtained temperature data was transferred to the computer including the necessary hardware and software. For measurement of cutting forces, a KİSTLER 9257 B type dynamometer and its software were used. The experimental results showed that chip-back temperature increases with increasing cutting parameters (cutting speed, feed rate, depth of cut). It is seen from the resultant graphs that the cutting speed had the most influence on the temperature while the feed rate had the less. When the relationship between chip-back temperature and cutting forces was evaluated, a reduction tendency in the cutting forces with increasing cutting speed was observed. On the other hand, the temperature increased with increasing cutting speed.Key Words : Chip-back temperature, Embeded thermocouple method, Cutting tools, Cutting forces, Cutting parameters.