汽车用S45C钢锻造过程中热传递系数的建模与分析

Modeling and Analysis of Heat Transfer Coefficient of S45C Steel for Automobile in Forging Process

以汽车车身材料S45C钢为试验对象,进行了锻造工艺试验,获得其在不同温度(820、930、1030、1180℃)、不同保温时间(10、30、60 min)及不同接触压力下的热传递系数。通过试验数据分析了热传递系数与氧化层厚度、接触压力之间的关系,并建立热传递系数计算模型。分析结果表明:热传递系数与氧化层厚度、保温时间、接触压力密切相关;热传递系数随氧化层厚度、保温时间的增加而降低,随着接触压力的增加逐渐增加;使用数学模型求得的热传递系数与试验结果吻合度较高。

Taking automobile body material S45C steel as the experimental object, the forging process test was carried out. The heat transfer coefficients were obtained at different temperatures （820, 930, 1030, 1180 ℃）, holding times （10, 30, 60 min） and contact pressures. The relationships among heat transfer coefficient and oxide layer thickness and contact pressure were analyzed by the experimental data, and the calculation model for the heat transfer coefficient was established. The analysis results show that the heat transfer coefficient is closely related to the thickness of oxide layer, holding time and contact pressure; the heat transfer coefficient decreases with the increase of the oxide layer thickness and holding time： the heat transfer coefficient gradually increases with the increase of contact pressure; the heat transfer coefficient obtained by the mathematical model is in good agreement with the experimental results.