Shape accuracy in the forming of deep holes with retreat and advance pulse ram motion on a servo press
Shape accuracy in the forming of deep holes with retreat and advance pulse ram motion on a servo press
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DOI：
10.1016/j.jmatprotec.2012.11.023
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发表时间：
2013-05-01
影响因子：
6.3
通讯作者：
Utsunomiya, Hiroshi
中科院分区：
文献类型：
--
作者：
Matsumoto, Ryo;Jeon, Jae-Yeol;Utsunomiya, Hiroshi
提出了一种利用伺服压力机和带有液体润滑剂内通道的凸模在轻量化结构件深孔反挤压过程中保持润滑的方法。用伺服压力机以脉冲和步进模式相结合的方式将冲头推入试样中。在冲头后退时，通过内部通道周期性地向变形区供应足够的液体润滑剂。在所提出的使用伺服压力机的成形方法中，确定了挤压比在1.07-1.80范围内的用于防止成形孔磨损的适当冲头运动。此外，发现所提出的方法可以产生具有高形状精度的成形孔。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。(C)2012爱思唯尔有限公司版权所有。
A method for keeping lubrication in the backward extrusion of deep holes for lightweight structural components is proposed utilizing a servo press and a punch with an internal channel for liquid lubricant supply. The punch is pushed into the specimen with a servo press in a manner that combines pulsed and stepwise modes. Sufficient liquid lubricant is periodically supplied to the deformation zone through the internal channel upon the retreat of the punch. The appropriate punch motions for prevention of galling of the formed hole for extrusion ratios in the range 1.07-1.80 were determined in the proposed forming method using a servo press. Furthermore, the proposed method was found to produce the formed holes with high shape accuracy. The shape accuracy of the formed hole is discussed with experimental and finite element simulation results in terms of lubrication state and temperature change. (C) 2012 Elsevier B.V. All rights reserved.