曲轴将活塞的往复运动转变为轴的旋转运动,即承受气压和惯性力之往复直线运动之功转变为扭转之功,并将储藏于飞轮之能量又转为往复能量,在发动机吸气压缩排气时推动活塞。因此,曲轴承受弯曲、扭转的复合应力和冲击循环载荷。对制造曲轴的材质而言,除了要求具有高的静力强度外,还要求有高的疲劳强度。如何评定球铁曲轴的机械性能?在国外评定球铁曲轴的性能的主要趋向是静力强度。文章列出球铁化学成分、强化方法和金相组织对静力强度和疲劳强度的影响的试验数据(见 Crankshaft piston reciprocating motion into shaft rotation, that is, to withstand the pressure and inertia of the reciprocating linear motion power into torque function, and the energy stored in the flywheel into reciprocating energy, suction in the engine row Piston when the gas. As a result, crankshafts are subject to bending, twisting complex stresses and impact cyclic loads. The material used to make the crankshaft requires high fatigue strength in addition to high static strength. How to evaluate the mechanical properties of ductile iron crankshaft? In foreign countries to evaluate the performance of ductile iron crankshaft is the main trend of strength. The article lists experimental data on the effects of chemical composition, strengthening methods and microstructure of ductile iron on static strength and fatigue strength (see