牙轮钻头球面浮动套高频淬火过程温度场数值模拟

Numerical simulation of temperature field during high-frequency quenching process of spherical floating ring of rock bit

建立球面浮动套在淬火冷却过程中温度场有限元模型,分析温度场变化规律和分布状态,温度场模拟结果表明:在整个淬火过程中,球面浮动套截面沿径向温差先增大后减小,冷却到5s时,温差最大为162℃;冷却到50s时,外表面率先发生马氏体转变;当冷却到150s时,球面浮动套芯部温度为281℃,几乎完成马氏体转变。模拟温度值与实测温度值进行比较,一致性较好,证明所建模型有效。

Finite element model of temperature field in high-frequency quenching process was built,and the change and distribution of temperature field was analyzed. The simulated results of temperature field show that the difference of the radial temperature of section of spherical floating ring firstly increases and then decreases during cooling,and the maximum difference of temperature is 162℃ at 5s. The martensitic transformation firstly occurs at outside surface of spherical floating ring of rock bit when cooled to50s,and almost finishes at 150s,and at this moment the temperature of spherical floating ring in the cores is 281℃. A comparison of simulated temperature value and measured shows good agreement and proves the validity of the model.