18CrNiMo7-6钢牙轮钻头轴承渗碳工艺的优化

Optimization of Carburizing Process for 18CrNiMo7-6 Bearing in Cone Bit

为了确定18CrNiMo7-6钢牙轮钻头轴承的最优渗碳面和最优扩散系数,通过建立数值计算模型、扩散系数模型和物理模型,对两种可选择的渗碳面以及不同扩散系数的渗碳结果分别进行对比研究,并对最优结果进行验证。结果表明:牙轮钻头轴承最优的渗碳面是外表面,最优的扩散系数为1.5×10^(-6)m^2/s,满足了牙轮钻头轴承表面耐磨、芯部具有韧性的要求,为制定合格的渗碳工艺提供理论支撑。

In order to determine the optimal carburizing surface and optimal diffusion coefficient of 18CrNiMo7-6 bearing in cone bit, through the establishment of numerical model, the diffusion coefficient model and the finite element model, two alternative carburizing surfaces as well as different carburizing results of coefficient diffusion were compared. And the best results were verified. Results show that： the best carburizing surface is the outer surface of bearing in cone bit, and the optimal diffusion coefficient is 1.5 ×10^-6 m2/s, which meets the requirements of not only wear about bearing surface, but also the ductility in beating core in cone bit, and provides a theoretical support for the development of qualified carburizing process.