BR1500HS高强钢与5CrMnMo模具钢的瞬态接触换热系数

发布时间：2019-02-23 18:45

【摘要】：利用自制的实验装置,分析热冲压传热过程并将其简化为一维传热,在一定压力和一定的保温时间下测量高强钢和模具的温度变化,基于改进的反传热算法求解在一定界面平均温度和压力以及一定的保温时间下的界面换热系数的变化。研究结果表明:换热系数随着温度和压力的升高而增大且与温度以及压力近似呈幂函数关系,高温时换热系数对压力的敏感性较低温时高。随着保温时间的增加,氧化严重,换热系数减小,且随着压力和保温时间的增加,换热系数逐渐趋于稳定。在一定保温时间下,换热系数只与温度和压力有关,且压力对换热系数的影响较温度对换热系数的影响大,将温度和压力与换热系数很好地拟合在一起,得到换热系数随温度和压力变化的表达式。
[Abstract]:The heat transfer process of hot stamping is analyzed and simplified to one-dimensional heat transfer by using the self-made experimental device. The temperature changes of high strength steel and die are measured under certain pressure and certain holding time. Based on the improved inverse heat transfer algorithm, the variation of the interfacial heat transfer coefficient at a certain interface average temperature and pressure and a certain holding time is solved. The results show that the heat transfer coefficient increases with the increase of temperature and pressure and has a power function relationship with temperature and pressure. The sensitivity of heat transfer coefficient to pressure at high temperature is higher than that at low temperature. With the increase of heat preservation time, the heat transfer coefficient decreases with the increase of heat preservation time, and the heat transfer coefficient tends to be stable with the increase of pressure and holding time. At a certain holding time, the heat transfer coefficient is only related to temperature and pressure, and the influence of pressure on heat transfer coefficient is greater than that of temperature. The expression of the change of heat transfer coefficient with temperature and pressure is obtained.
【作者单位】：重庆大学材料科学与工程学院;
【基金】：中央高校基本科研业务费专项资金资助项目(CDJZR13130082)~~
【分类号】：TG142.1

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