To accurately model warm and hot forming operations, correct values for heat transfer coefficient (HTC) are required, among other parameters. In this work, an experimental methodology is proposed to obtain HTC data for a high strength steel alloys (Usibor® 1500 A-S), seven aluminum alloys (AA5182-O, AA5754-O, AA6013-T6, AA6063-T6, AA6061-T6, AA7075-T6 and a developmental AA7xxx-T76) and two magnesium (AZ31B-O and ZEK100-O) alloys. The HTC was characterized as a function of contact pressure from 2 to 80 MPa. Overall, the HTC values exhibited significant variation (ranging from 355 to 1887 W/m²-K), but tended to correlate primarily with contact pressure and material strength/alloy system. Two lubricants were also considered (Fuchs Forge Ease 278 and PTFE spray) for some alloys, but had only a minor effect on HTC relative to “dry” tooling. Neither the initial temperature of the tooling nor the ramping up of the press tonnage had a noticeable effect on the HTC since the HTC values were identified based only upon the relative temperature difference and thermal properties of the materials. The experimentally determined HTC values were then applied in a series of non-isothermal cylindrical cup warm deep drawing experiments. The deep draws were modelled using finite element (FE) techniques, which utilized the measured HTC values. The temperature-time profiles from the deep draws were found to agree well with the predicted profiles, indicating that the methodology used to determine HTC and the resulting HTC values, are applicable for use in a metal forming simulation involving heat transfer.

为了准确地模拟热成型和热成型操作，除其他参数外，还需要正确的传热系数（HTC）值。在这项工作中，提出了一种实验方法，以获取高强度钢合金（Usibor®1500 AS），七种铝合金（AA5182-O，AA5754-O，AA6013-T6，AA6063-T6，AA6061-T6， AA7075-T6和发展中的AA7xxx-T76）和两种镁合金（AZ31B-O和ZEK100-O）。HTC的特征是接触压力为2至80 MPa。总体而言，HTC值显示出显着变化（范围从355到1887 W / m ²-K），但往往主要与接触压力和材料强度/合金体系相关。对于某些合金，也考虑使用两种润滑剂（Fuchs Forge Ease 278和PTFE喷涂），但相对于“干式”工具，对HTC的影响较小。模具的初始温度和压力机吨位的增加都不会对HTC产生显着影响，因为HTC值仅基于材料的相对温度差和热性能来确定。然后将实验确定的HTC值应用于一系列非等温圆柱杯热深拉伸实验。使用有限元素（FE）技术对深冲进行建模，该技术利用了测量的HTC值。发现深抽的温度-时间曲线与预测的曲线非常吻合，