C18150铜合金与H13模具钢稳态接触换热系数实验研究

Experimental investigation on steady state contact heat transfer coefficient between C18150 copper alloy and H13 mold steel

使用一套稳态接触换热系数实验设备,测量了C18150铜合金与H13模具钢的稳态接触换热系数。控制热流方向由H13模具钢流向C18150铜合金,界面平均温度为200~600℃,接触载荷分别为1.56、6.24、10.92和15.6MPa。研究分析了界面平均温度、接触载荷、接触历史过程对稳态接触换热系数的影响规律。界面平均温度通过改变材料属性和接触表面状态进而影响稳态接触换热系数。实验结果表明,界面平均温度为345℃、接触载荷为15.6MPa时,稳态接触换热系数最大。不同接触历史过程下,加载过程中测量的稳态接触换热系数小于卸载过程。实验研究可进一步提高C18150铜合金热成形过程数值模拟的精度,进而提高成形质量。

The steady state contact heat transfer coefficient between C18150 copper alloy and H13 mold steel was measured by a set of steady state contact heat transfer coefficient experimental equipment,and the direction of heat flow was controlled from H13 mold steel to C18150 copper alloy under the interface average temperature of 200-600℃and the contact load of 1.56,6.24,10.92 and 15.6 MPa,respectively.Then,the influence laws of the interface average temperature,contact load and contact history process on the steady state contact heat transfer coefficient were studied and analyzed,and the steady state contact heat transfer coefficient was affected by the average interface temperature through changing the material properties and the contact surface state.The experimental results show that the steady state contact heat transfer coefficient is the largest when the interface average temperature is 345 C and the contact load is 15.6 MPa.The steady state contact heat transfer coefficient in the loading process is smaller than that in the unloading process during different contact his-tory processes.Thus,the experiment study can further improve the accuracy of the numerical simulation for C18150 copper alloy thermo-forming process to further improve the forming quality.