中文摘要：

界面传热系数是关键的边界参数之一,其准确程度直接影响温度场、应力应变场、组织场等的求解精度。界面压力是影响界面传热系数的主要因素之一,为了研究热冲压过程中界面压力对界面传热系数的影响,根据热冲压过程中模具与硼钢板之间热交换的特点,设计试验工装,利用CMT5000型微机控制智能电子拉伸试验机对试样和试验工装施加压力,利用通用串行总线接口的温度高速采集系统采集0 MPa、1 MPa、10 MPa、20 MPa及40 MPa压力时的试样冷却曲线,利用自主开发的逆向传热软件对测试得到温度数据进行计算分析,获得测试工装与硼钢板之间单位面积接触压力对测试工装与硼钢板之间界面传热系数的影响规律。研究结果表明,硼钢和测试工装表面温度对于界面传热系数没有明显影响;硼钢表面的氧化情况对于界面传热系数有显著影响;界面传热系数与界面压力近似呈线性关系,界面传热系数随着界面压力的增大而变大。

英文摘要：

Surface heat transfer coefficient is one of the most important boundary parameters in the hot stamping of boron steel,the accuracy of this parameter has an obvious effect on the simulation result of temperature,phase transformation,stress/strain and so on.In order to research the boundary pressure,which is the main factor affecting surface heat transfer coefficient,a testing device is designed according to the characteristic of heat transfer between boron steel and die in the hot stamping.In the process of testing,CMT5000 tensile testing machine is used to put a pressure on the boron sample and testing device,a high speed data acquisition system is used to record the cooling curves of boron sample when the pressure is 0 MPa,1 MPa,10 MPa,20 MPa and 40 MPa.The self-developed software of inverse heat conduction is used to analyze the temperature variation and evaluate the surface heat transfer coefficient between the boron sample and testing device.The effect of boundary pressure on the surface heat transfer coefficient is attained,and the research results show that,the surface temperatures of boron steel and testing device have little effect on the surface heat transfer coefficient.The oxidation of boron steel has a remarkable effect on the surface heat transfer coefficient.The surface heat transfer coefficient increases with the rise of boundary pressure,and the relationship is approximately linear.