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Experimental heat transfer coefficient measurements during hot forming die quenching of boron steel at high temperatures

机译:高温下硼钢热成型模具淬火过程中的实验传热系数测量

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Hot forming die quenching is used by the automotive industry to produce ultra high strength steel parts with a high strength-to-weight ratio. Crash-resistant structural parts with distributed properties can be obtained by controlling the local cooling rate during the quenching step using heated dies. This procedure requires detailed spatial knowledge of the heat transfer coefficient at the blank/die interface. Hot stamping experiments were conducted on Usibor~® 1500P boron steel blanks to investigate how pressure and blank and die temperatures influenced the heat transfer coefficient, which was inferred using inverse heat conduction analysis. The heat transfer coefficient was found to vary throughout the experiment with deformation of the surface roughness peaks and evolution of the blank and die temperatures. Whereas the heat transfer coefficient at the beginning of the stamping process increases with the initial die temperature, it converges to a value that depends only on applied pressure. Moreover, the experimental heat transfer coefficient for zero pressure was found to match the air gap conductance predicted by semi-empirical models, but the pressure-dependent component was lower than the model-predicted solid contact conductance.
机译:汽车工业使用热成型模具淬火来生产具有高强度重量比的超高强度钢零件。通过使用加热模具控制淬火步骤中的局部冷却速度,可以获得具有分布特性的耐碰撞结构部件。此过程需要详细了解坯料/模具界面传热系数的空间。在Usibor〜®1500P硼钢毛坯上进行了热冲压实验,以研究压力,毛坯和模具温度如何影响传热系数,这是通过反向导热分析得出的。发现在整个实验中,传热系数随表面粗糙度峰值的变形以及坯料和模具温度的变化而变化。冲压过程开始时的传热系数随初始模头温度而增加,但收敛到仅取决于施加压力的值。此外,发现零压力的实验传热系数与半经验模型预测的气隙电导率相匹配,但与压力有关的分量低于模型预测的固体接触电导率。

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