论文部分内容阅读
我厂生产的270Q汽车发动机35CrMo钢曲轴如图1所示,热处理技术条件要求整体调质,HRC23-30,主轴颈1、2、3及连杆1、2表面淬火,HRC55-63。中频感应加热采用100kW、8000Hz的机械式变频机,用喷水冷却,因出现淬火裂纹对产品质量影响很大。对于轴类零件的淬火,当材料具有非金属夹杂物等内部缺陷,整体加热淬火时,裂纹的形式多为纵向,即裂纹与轴线方向平行或成一定角度,极少为横向(周向)裂纹。局部感应加热淬火产生周向裂纹的,固
I produced the factory car engine 270C 35CrMo steel crankshafts shown in Figure 1, the heat treatment requires the overall quality quenching and tempering, HRC23-30, the main journal 1,2,3 and connecting rod 1,2 surface hardening, HRC55-63. IF induction heating with 100kW, 8000Hz mechanical frequency, cooling with water spray, quenching cracks on the product quality impact. For the quenching of shaft parts, when the material has internal defects such as non-metallic inclusions, the overall shape of the crack is longitudinal when the whole body is heated and quenched. That is, the crack is parallel or at an angle with the axial direction and is rarely a transverse (circumferential) crack . Local induction heating quenching produce circumferential cracks, solid