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图示小内齿轮(m=3,Z=38,材料为20Cr)是我厂产品JD型调度绞车上的零件,由于长期以来插齿光洁度达不到5,成为影响提高产品质量的重要问题。该齿轮毛坯热处理技术要求为:正火,硬度为HB180～207,是为了保证材料具有良好的切削性能和为了减少最终热处理变形。可是多年生产实践发现,光洁度达不到要求的主要原因是插齿刀很快磨钝,形成刀瘤,将齿面拉 ,为此,我们采用普通退火工艺,将齿坯硬度降低到HB140以下,以求 材料的切削阻力,保持刀具刃口的锋利。经两年多来的
Figure shows a small internal gear (m = 3, Z = 38, the material is 20Cr) is our factory products JD-type scheduling on the winch parts, as a result of a long time less than 5 penetration dentures, become an important issue affecting the quality of products. The gear blank heat treatment technical requirements: normalizing, hardness HB180 ~ 207, is to ensure that the material has good cutting performance and in order to reduce the final heat treatment deformation. However, many years of production practice found that the main reason for unsatisfactory finish is that the gear shaper soon blunt, the formation of knives, pulling the tooth surface, for which we use ordinary annealing process to reduce the hardness of the gear below HB140, In order to cut the resistance of the material, keep the cutting edge sharp. After more than two years