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4115T柴油机曲轴的感应淬火原采用分开式感应器,质量上存在硬化层深度沿轴向、周向分布不匀等问题。为解决质量方面的问题,对采用半环形感应器的曲轴中频旋转淬火的工艺方法进行了试验研究。所采用的感应器的有效圈呈半环形。轴颈的加热主要依靠有效圈的四条迭放硅钢片的导体的轴向分支。淬火喷头安装在感应器的两侧。通过曲轴旋转使整个加热表面得到均匀冷却。所采用的电源频率是8000Hz,加热功率是120～140kW。变压器容量是500kVA,变压比是8:1。淬火时工件旋转的速度是36rpm。通过工艺试验,曲轴采用上述方法淬火后质量良好,硬化层深度和表面硬度均匀、硬化带边缘整齐。在工艺试验的基础上设计制成了现已在生产上使用的曲轴中频旋转淬火自动线。文中对这种自动线进行了简要的介绍。
4115T diesel engine crankshaft induction quenching the original use of separate sensors, the quality of the hardened layer depth along the axial and circumferential uneven distribution and other issues. In order to solve the quality problem, the experimental research on the process of medium frequency rotary quenching of the crankshaft with half-ring inductor was carried out. The effective circle of the inductor used is semi-circular. The journal heating mainly depends on the axial branches of the conductors of the four stacked silicon steel sheets in the effective circle. Quench nozzles are mounted on both sides of the inductor. The entire heating surface is cooled evenly by crankshaft rotation. The power frequency used is 8000Hz, heating power is 120 ~ 140kW. Transformer capacity is 500kVA, transformer ratio is 8: 1. Quenching the workpiece rotation speed is 36rpm. Through the process test, the crankshaft is quenched with the above method and the quality is good. The depth of the hardened layer and the surface hardness are uniform, and the edge of the hardened belt is neat. Based on the process test, it is designed and manufactured into a crankshaft intermediate frequency rotary quenching automatic line which is now used in production. The text of this automatic line was briefly introduced.