Abstract:An ANN BP model was built to imitate the relation between output,the wear of hobbing cutter,and inputs,such as rotary speed of cutter,air flow,air jet speed,air temperature,situation of hobbing cutter and hardness of workpiece.A program was compiled to extrapolate the total life of hobbing cutter based on the BP model.The conclusion could be obtained by the program about the total life of hobbing cutter in cryogenic air with MQL,as follow.When parameters vary in given zone,air jet speed has the largest effect on the total life of hobbing cutter by 23.8%,and follows the air flow by 13.5%,and last is the air temperature by 4.4%.