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曲轴弯曲,使连杆轴颈与主轴颈的中心线不平行,各主轴颈不同心,旋转起来,不仅使活塞连杆组的工作性能变坏,而且将会产生烧瓦、抱轴乃至断轴等严重后果。对于轴颈磨损超限(椭圆、锥形、轴瓦间隙)而又有弯曲的曲轴,如果未经校直就磨,则会加大磨削量,造成浪费。所以,曲轴在磨修前都要检查其弯曲度。按技术要求,每米长超过0.10毫米弯度的曲轴,就应进行校直。目前普遍的做法是:当曲轴的弯度在0.10毫米以内时,可用磨削的方法来消除。弯度过大时,一般在压力机上用冷压校直法。这种校直方法,不仅费工费时,还易造成应力集中,降低曲轴的疲劳强度。
Crankshaft bending, the connecting rod journal and the centerline of the journal is not parallel, the main journal is not the heart, rotate up, not only the performance of the piston rod group worse, and will have a bush, hold the shaft and even the broken axis Other serious consequences. For journal wear overrun (oval, conical, bush gap) and have a curved crankshaft, if not aligned on the grinding, it will increase the amount of grinding, resulting in waste. Therefore, the crankshaft must be worn before repair to check its curvature. Accordance with the technical requirements, each meter length of more than 0.10 mm crankshaft should be straightened. It is a common practice today that grinding can be used to eliminate crankshaft camber within 0.10 millimeters. Curvature is too large, the general press on the cold straightening method. This method of straightening, not only time-consuming work, but also easily lead to stress concentration, reducing the fatigue strength of the crankshaft.