Abstract:Due to higher hardness and bending strength, ultrafinegrain cemented carbide tools can satisfy the higher requests of modern manufacturing, and it has shown obvious advantages in the field of high speed cutting of difficulttomachine material. In the machining of stainless steel, the cutting temperature has a great influence on the tool wear, and using most experimental methods are difficult to measure the specific temperature distribution on cutting tool. The processes of 304 stainless steel turning by ultrafinegrain cemented carbide cutting tools were simulated based on DEFORM software. The influences of cutting parameters, such as cutting speed, feed and cutting depth on tool temperature were analyzed by orthogonal experiment. Simulation results and cutting experiment results were compared, and the contrast cutting experiments with ultrafinegrain cemented carbide tools and conventional cemented carbide tools were carried out. The results show that the influences of cutting parameters on the temperature of ultrafinegrain cemented carbide tools are similar to conventional cemented carbide tools, cutting speed has the main influence on temperature followed by feed rate and cutting depth. Ultrafinegrain cemented carbide tools have better heat dissipation than conventional cemented carbide tools, the advantages are more obvious at higher speed conditions especially.