17CrNiMo6钢斜齿轮热处理仿真分析中的位移边界条件

基于17CrNiMo6钢热处理过程传热、组织场转变和热弹塑性数学模型,建立了斜齿轮零件热处理有限元模型。对17CrNiMo6钢斜齿轮的热处理过程进行了模拟,并分析了固定约束、对称约束、摩擦约束3种位移边界条件对热处理仿真畸变的影响。结果表明:17CrNiMo6钢斜齿轮淬火后齿轮表面受压应力,而心部受拉应力,齿根处压应力大于齿顶处。与目前普遍采用的固定约束或对称约束边界条件相比,采用摩擦约束的仿真结果更加符合实际情况。

Displacement boundary conditions in heat treatment simulation analysis of 17CrNiMo6 steel helical gear

Based on the mathematical models of heat transfer, structure field transformation and thermo-elastoplasticity in 17CrNiMo6 steel heat treatment process, a finite element model of the helical gear heat treatment was established. The heat treatment process of the 17CrNiMo6 steel helical gear was simulated, and the influence of the three displacement boundary conditions (fixed constraint, symmetric constraint and friction constraint) on the distortion of heat treatment simulation was analyzed. The results show that the surface on the 17CrNiMo6 steel helical gear is subjected to compressive stress after quenching, but the core is subjected to tensile stress, and the compressive stress at the root of the tooth is greater than that at the top of the tooth. Compared with the commonly used boundary conditions of fixed or symmetrical constraints, the simulation results of friction constraints are more in line with the actual results.