Abstract: When broaching the heat resistant steel Cr11MoV. The surface roughness is rather poor. In this paper, having test and analysis that the seal results from broaching, and suggest that the seal may be inhibited by the following method: (1)Use of the cutting coolant containing additives of chlorine; (2)To properly increasing the hardness of the workplace material; (3)Lower speed of broaching may be used; (4)Depress the surface roughness of the face and major flank of the broaches, do not keep land on the major flank. To use these method, in broaching of the fir tree-form slots in turbine wheels of the turbocharger, the results is that the surface roughness is reduced by 80% and the life of the broaches will increase more than 2 times.

Key words: 拉削, 鳞刺, 耐热钢