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汽车的传动、转向、悬挂等系统的轴类零件均承受较高的弯、扭疲劳载荷,以前多用中碳低合金钢经调质处理。调质与中频热处理相比,其主要缺点是零件寿命低,成本高(材料费和电能消耗高)。因此,有较多的零件(如传动轴,前、中、后桥半轴,转向节,平衡轴,摆臂轴等)已用中频感应加热淬火。这些零件属变截面轴,技术要求有下列特点:1、在高应力区淬硬层要求连续;2、淬硬层较深并且与直径成一定比例,以保持表层有较高的强度和残余压应力。
Automotive transmission, steering, suspension systems such as shaft parts are subject to higher bending, torsion fatigue load, before the more use of low carbon steel in the quenched and tempered. Compared with the intermediate frequency heat treatment, the main disadvantage of quenching and tempering is that the life of the parts is low and the cost is high (the material cost and the power consumption are high). Therefore, there are more parts (such as the drive shaft, front, middle and rear axle axle, knuckle, balance shaft, swing arm shaft, etc.) have been induction quenched with IF induction heating. These parts are variable cross-section axis, the technical requirements have the following characteristics: 1, in the high-stress zone hardened layer requires continuous; 2 hardened layer and the diameter into a certain percentage, in order to maintain a high surface strength and residual pressure stress.