Development of Pulse Forming Method Utilizing Servo Press and Die with Internal Channel for Lubricant

提出了一种利用冲头的成形方法，该冲头具有用于向冲头供应液体润滑剂的内部通道。(1)将所提出的成形方法应用于纯钛试件在伺服压力机上的成形。在适当的脉冲冲压运动下，该成形方法成功地获得了孔深/直径为2.0的成形钛试件。(2)所提出的成形方法具有较高的成形孔形状精度。结合实验和有限元模拟结果，从润滑状态和温度变化两个方面讨论了成形孔的形状精度。(3)将所提出的脉冲冲头冲压运动成形方法应用于高高径比正反向复合挤压工艺。通过铝试件在脉冲冲压挤压过程中的材料流动，确定了试件-凸模界面的剪切摩擦系数。

A forming method utilizing a punch having an internal channel for supplying liquid lubricant to the punch nose was proposed. (1) the proposed forming method was applied to forming of pure titanium specimen using a servo press. The formed titanium specimen with formed hole depth/diameter of 2.0 was successfully obtained in the proposed forming method with appropriate pulse punch ram motion. (2) the proposed forming method was found to produce the formed holes with high shape accuracy. The shape accuracy of the formed hole was discussed with experimental and finite element simulation results in terms of lubrication state and temperature change. (3) The proposed forming method with pulse punch ram motion was applied to combined forward-backward extrusion process with a high height/diameter ratio. The coefficient of shear friction at the specimen–punch interface was identified from the material flow of the aluminum specimen during the extrusion with pulse punch ram motion.