Abstract

The coefficient of friction plays a key role in the metalforming process, especially at high temperatures, to reduce the required energy for material forming. In this study, compression ring test was carried out to determine the shear friction coefficient of the hot-working steel alloy A105 at 1050 °C. The friction coefficient was evaluated for specimens without lubrication and graphite, mica, and glass powder lubricants. The variations in specimen inner diameter during the deformation process were then calculated at several coefficients of friction using the finite element analysis. By employing experimental and numerical results, the coefficient of friction for each lubricant was determined. The results showed that the predicted coefficient of friction for dry samples was 0.62. Moreover, the friction coefficient values obtained using graphite, mica, and glass powder were 0.46, 0.29, and 0.18, respectively.

摘要

摩擦系数在金属成型过程中起着关键作用，特别是在高温下，以减少材料成型所需的能量。在这项研究中，进行了压缩环试验，以确定热加工钢合金 A105 在 1050°C 时的剪切摩擦系数。对没有润滑和石墨、云母和玻璃粉润滑剂的试样的摩擦系数进行了评估。然后使用有限元分析在几个摩擦系数下计算变形过程中试样内径的变化。通过采用实验和数值结果，确定了每种润滑剂的摩擦系数。结果表明，干燥样品的预测摩擦系数为 0.62。此外，使用石墨获得的摩擦系数值，