Abstract: High-speed dry hobbing is a kind of green and high efficiency gear manufacturing process while eliminating the use of cutting oil/liquid. Differed from traditional wet hobbing, cutting heat that accompanies the whole machining process is an important factor for dry hob cutter wear and machine tool thermal deformation, and directly affects cost and accuracy of the process. According to periodic intermittent heat transfer characteristics of high-speed dry hob, a new idea which divides the heat generation and transmission process of high-speed dry hobbing system into three stages is put forward by making comprehensive consideration for transfer laws of cutting heat among chip, workpiece, dry hob, cooling medium and machine tool working space. The whole process heat transfer model is established from two aspects of relational model and heat transfer equation, which refers to heat transfer on cutting contact interface, heat transfer in cutting regions and heat transfer in machine tool working space. The dynamic variation rule of cutting heat among workpiece, dry hob and chip are analyzed based on the simulation result of high-speed dry hobbing. Moreover, the effectiveness of the proposed model is verified by experiment.

Key words: cutting heat, high-speed dry hobbing, three-stage heat transfer