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在发动机曲轴上钻有从主轴颈通往连杆轴颈的斜的油孔,使连杆轴颈和轴瓦得到润滑。几乎所有经整圈感应加热表面淬火的曲轴在油孔边缘普遍发生肉眼可见的裂纹。长春第一汽车制造厂原采用在油孔内打入紫铜销来防止油孔部位的裂纹。用这种方法操作苯重、废品率高、辅助费用大。为解决这个问题,寻求油孔部位裂纹的原因,进行了探讨性实验和分析,认为油孔部位的裂纹是在感应加热过程中产生的。通过解决油孔部位裂纹的措施的探索,终于找到了在感应器中嵌入硅钢片的方法。实验证明,感应器内相对油孔处嵌入条形的叠合的硅钢片,通过叠合的硅钢片尺寸和安装位置的改变,可以有目的地改变油孔周围的涡流及其电磁场的分布,从而得到较好的加热效果。既能使轴颈表面淬火后质量合格,又能消除油孔部位的裂纹。试产了1000根曲轴,油孔处没有裂纹,也没有过热现象,可取代打入紫铜销的防护措施。投产后为国家节约了大量的费用,方便了生产,收到了较好的效果。
In the engine crankshaft drilled from the main journals to the connecting rod journal oblique hole, so that connecting rod journal and bearing lubrication. Almost all crankshafts that have been quenched by full-circle induction heating generally appear to have visible cracks at the edges of the oil hole. Changchun first car factory used in the oil hole into the copper pin to prevent cracks in the hole site. Use this method to operate benzene weight, high rejection rate, auxiliary costs. In order to solve this problem and seek the reason of the crack in the oil hole part, the exploratory experiment and analysis are conducted, and it is considered that the crack in the oil hole part is generated during the induction heating. Through the solution to the crack in the oil hole part of the exploration, finally found in the inductor embedded silicon steel sheet method. Experiments show that the relative oil hole at the inductor embedded bar-shaped stack of silicon steel sheet through the laminated silicon steel sheet size and installation position changes can be purposefully change the eddy current around the oil hole and its electromagnetic field distribution Get better heating effect. Both the quality of the journal after quenching the surface, but also to eliminate cracks in the hole site. Trial production of 1000 crankshafts, there is no cracks in the hole, there is no overheating, can replace the protective measures into the copper pin. Put into operation for the country to save a lot of costs, facilitate the production, received better results.