发动机气门弹簧热处理工艺的优化

Optimization of Engine Valve Spring Heat Treatment Process

根据对气门弹簧的应力分析,设计了更为优化的气门弹簧的热处理工艺,分析右旋弹簧在同等喷丸条件下,采用不同的热处理工艺,内侧与钢丝轴线成45°方向的残余应力值,绘制弹簧钢丝内表面残余应力的分布曲线,并采用不同的气门弹簧样件模拟发动机实际工况、1.1倍工作应力幅和1.2倍工作应力幅,从而得到气门弹簧热处理工艺与气门弹簧残余应力及疲劳性能的关系。

More optimized engine valve spring heat treatment process was designed based on the stress analysis of valve spring. The residual stress in the direction of 45 degrees off the inside wire axis when right - handed shot at the same spring condition was analyzed by using different heat treatment process. Distribution curves of the surface residual stress of inner spring steel surface were drafted. And by using different sample valve springs to simulate actual engine operating con- ditions, 1. 1 times the operating stress amplitude and 1.2 times the operating stress amplitude, the relationship between the heat treatment process valve springs with the valve spring residual stress and fatigue properties can be obtained.