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本文以20CrMnTi渗碳齿轮为试样,观察了齿面磨裂断口形貌,研究了齿面磨削前后的残余应力,瞬时磨削应力,渗碳热处理工艺及钢的组织对磨裂倾向的影响。认为:(1)磨裂断口基本上为沿晶界断裂;(2)高硬度(HRC58-62)齿轮磨削后的齿面上存在着残余压应力,硬度越高,平行磨向的压应力值越大;(3)磨削裂纹是由磨削冷却期间的瞬时应力造成的;(4)改善磨削条件可有效地减少磨削应力;(5)在良好磨削条件下,配合以较好的渗碳热处理工艺,既可提高磨削生产效率又可减少磨削裂纹。
In this paper, 20CrMnTi carburized gear was used as a sample to observe the fracture morphology of the tooth flank and to study the influence of residual stress, instantaneous grinding stress, carburizing heat treatment and the microstructure of the steel on the fracture tendency before and after grinding . The results show that: (1) Fracture of fracture is basically fracture along the grain boundary; (2) Residual compressive stress exists on the tooth surface after grinding with high hardness (HRC58-62); the higher the hardness is, the compressive stress The larger the value is; (3) the grinding crack is caused by the instantaneous stress during grinding and cooling; (4) the grinding condition can be reduced by improving the grinding condition; (5) under the condition of good grinding, Good carburizing heat treatment process, can improve the grinding efficiency but also reduce grinding cracks.