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在分析了预置式激光表面熔覆边界传热特点的基础之上,建立了简化的三维温度场分析模型,模拟激光熔覆模压预置层时工件的瞬态温度场;同时,在温度场模拟的基础上提出了以界面定点热循环曲线的最高温度达到特定金属的熔点作为判断预置层与基体间形成良好冶金结合的标准,并依据此标准预测了预置式激光表面熔覆时的工艺参数范围。结果表明,模拟预测的工艺参数范围与实际加工的最佳参数较为接近,对预置式激光表面熔覆的工艺参数选择具有指导意义。
Based on the analysis of the heat transfer characteristics of the prefabricated laser surface cladding boundary, a simplified three-dimensional temperature field analysis model was established to simulate the transient temperature field of the workpiece when the laser pre-cladding layer was pre-deposited. Meanwhile, Based on the simulation results, the maximum temperature of the fixed-point thermal cycle curve reaches the melting point of the specific metal as a criterion to determine the good metallurgical bonding between the pre-set layer and the substrate. Based on this standard, Process parameters range. The results show that the range of process parameters predicted by simulation is close to the optimal parameters of actual machining, which is instructive for the selection of process parameters of laser surface cladding.