| 摘要:曲轴过渡圆角为应力集中处，在制造工艺过程中其表面会产生残余拉应力，对疲劳强度极为不利。根据材料裂纹的微观机理，对曲轴过渡圆角表面裂纹原因进行分析，在此基础上采用喷丸工艺对圆角进行强化。试验验证表明:喷丸强化能够使圆角表面形成残余压应力，提高曲轴的疲劳强度。并指出:目前喷丸工艺参数通过经验得到，须进一步研究更适合的喷丸强度，以及喷丸所形成的表面残余压应力和深度对曲轴疲劳强度的影响。 |
| 关键词: 曲轴 过渡圆角 喷丸工艺 疲劳强度 |
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| Anlysis of Crankshaft Fatigue Mechanism and Research onShot Peening Technology of Transition Fillet |
| Dong Yunqing,Yue Wen,Zhang Qiaoli,Lu Yinsong |
| Shanghai Marine Diesel Engine Research Institute, Shanghai 201108 |
| Abstract:There is a large stress concentration in the transition fillet, and during processing, residual tensile stress may generate on its surface, which has very bad effect on the fatigue strength of the crankshaft. According to the microscopic mechanism of crankshaft fatigue, the causes of the cracks occurred in the surface of the transition fillet was analyzed, and the transition fillet was strengthened by the shot peening process. Experimental results show that the existing shot peening parameters were set through experiences, and more rational shot peening strength should be studied, as well as the influence of surface residual tensile stress and depth on the fatigue strength of crankshaft. |
| Key words: crankshaft transition fillet shot peening fatigue strength |
