针对45钢三维点式感应淬火工艺进行参数设计,建立点式感应淬火过程的电磁场及温度场的非线性偏微分方程组,在有限元软件ANSYS中使用耦合场分析的方法实现了对加热功率为36 kW,电流频率为50 kHz的感应热处理工艺的数值模拟.结果表明,在综合考虑表面组织完全奥氏体化及感应加热效率的情况下,该工艺的最佳加热时间约为2 s.通过模拟分别得到使用冷却水和冷却油作为冷却介质时的感应淬火过程中的温度变化规律,结合45钢的连续冷却转变曲线,以马氏体转变临界冷却速度为判断依据,对淬火后工件表面组织进行预测,结果表明两种淬火条件均可以实现表面组织马氏体转变,实现工件的表面强化,且淬硬深度均约为1.0 mm.%The process parameters of 3D spot induction hardening of 45 steel were studied. To describe the electromagnetic and temperature fields during the spot induction hardening process, a 3D spot induction hardening model with parameters of heating power of 36 kW and frequency of 50 kHz was built via finite element software ANSYS using coupled field method according to nonlinear partial differential equation of electromagnetic and temperature fields. The results show that considering the austenitizing of surface area and induction heating efficiency, the optimal heat time during heating process is about 2 s. The quenching effects of different quenching medium (water and oil) were discussed by considering the simulated results and the continual cooling transformation curve of 45 steel, and the martensite transform critical cooling rate was used as the criterion for structure prediction. Results show that martensite structure can be obtained on the surface area under both conditions, and the quench depth is about 1. 0 mm.
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