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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。
The automobile body material S45C steel was used as the test object to carry out the forging process test to obtain its heat at different temperatures (820,930,1030,1180 ℃), different holding time (10,30,60 min) and different contact pressures Transfer coefficient. Based on the experimental data, the relationship between the heat transfer coefficient and the thickness of the oxide layer and the contact pressure is analyzed, and the heat transfer coefficient calculation model is established. The results show that the heat transfer coefficient is closely related to the thickness of the oxide layer, the holding time and the contact pressure. The heat transfer coefficient decreases with the increase of the thickness of the oxide layer and the holding time, and increases with the increase of the contact pressure. The heat transfer coefficient is in good agreement with the test results.