一种曲轴初始校直行程计算方法

Crankshaft initial straightening stroke algorithm

针对曲轴校直中初始校直行程难以确定的问题,根据弹塑性力学理论和有限元方法,研究曲拐旋转角度对曲轴校直过程的影响。以8缸直列式往复发动机曲轴校直为例,应用有限元法计算了曲轴校直中3种加载工况,以及不同工况下曲拐在不同旋转角度对应的应力和变形,并建立了应力变形系数表,结合台阶轴校直行程算法,提出了8缸直列式钢质曲轴初始校直行程计算方法。在YH40-160型曲轴校直液压机上进行校直实验,结果表明,该方法能有助于曲轴初始行程计算,可提高校直效率。

The effect of crankthrow rotation angle to crankshaft straightening process had been researched based on the elasticplastic mechanics and finite element method. The straightening of the crankshaft of 8-cylinder in line reciprocating diesel engines was taken for example. 3 loading cases had been calculated by finite element method. The stress and deformation at different crankthrow rotation angle and different loading case were analyzed and the stress-deformation coefficient table had been set up. The 8-cylinder in line crankshaft straightening initial stroke algorithm had been proposed according to the shoulder shaft straightening stroke algorithm. The experiment had been performed on the YH40-160 crankshaft straightening press, and the results showed that the algorithm is helpful to the initial stroke calculation and may improve the quality and efficiency of crankshaft straightening.