Research on tooth surface integrality of cold rolling spine

Based on the experimental research, metal microstructure evolvement, remnant stress distribution, hardness distribution and tooth surface quality, tooth surface integrality of cold rolling spline are studied in this paper. Since the cold rolling spline is formed by roller rolling workspace, the experimental research results indicate that there are many advantages for tooth surface integrality. The grain is refined. The dislocation density is increased evidently. Metal microstructure canpsilat be cut off during cold rolling process and it is eventually dragged into strip fibrous structure. Hardness of spline in surface layer metal is also improved markedly. Because there are no traces of metal tearing on tooth surface, the surface glabrousness is better. Using the experimental results, the distribution regularity of remnant stress is obtained in the direction of tooth surface and tooth depth. Also it is found that metal flowing accords with minimal damp law in the process of cold rolling. Some conclusions are obtained from the research results. Metal microstructure surface layer and remnant stress distribution are reformed. Strength of spline and tooth quality are improved. So tooth surface integrality is enhanced markedly. All in all, mechanism of improving tooth surface integrality of spline formed by cold rolling machining method is revealed in this paper.