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分析了计算流体力学模拟方法中模具冷却系统传热过程的流固耦合方法和第三类边界条件法的计算量和准确度,发现两种方法的模拟结果接近。前者可以准确地反映冷却水管内的流速及温度分布以及模具内的导热过程;后者仅分析模具的导热过程,计算模型简单、耗时短,是一种比较高效的近似模拟方法。通过分析热冲压模具内的传热机理可知,模具内的导热热阻是整个传热过程中的主要热阻。
The computational quantities and accuracy of the fluid-solid coupling method and the third type of boundary condition method for calculating the heat transfer of the mold cooling system are analyzed. The simulation results of the two methods are close to each other. The former can accurately reflect the flow velocity and temperature distribution in the cooling water pipe as well as the thermal conduction in the mold. The latter only analyzes the thermal conduction of the mold, and the calculation model is simple and time consuming, which is a relatively efficient approximate simulation method. By analyzing the heat transfer mechanism in the hot stamping die, it can be known that the thermal conductivity in the die is the main heat resistance in the whole heat transfer process.