Tribological behavior in micro-sheet hydroforming
Tribological behavior in micro-sheet hydroforming
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DOI：
10.1016/j.triboint.2016.01.041
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发表时间：
2016-05
影响因子：
6.2
通讯作者：
Hideki Sato;K. Manabe;D. Wei;Zhengyi Jiang;S. Alexandrov
中科院分区：
文献类型：
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作者：
Hideki Sato;K. Manabe;D. Wei;Zhengyi Jiang;S. Alexandrov
本文对微流体机械拉深（MHDD）中的摩擦学行为及其尺寸效应进行了理论和实验研究。研究发现，由于在较小的相对冲头直径至最小厚度下的高密封性，流体动力润滑所需的流体压力随着微尺度的缩小而显着增加。此外，与传统微成型相反的摩擦尺寸效应出现在 MHDD 中，其中流体介质可以通过施加流体压力保持在开放的润滑剂腔 (OLP) 中，并且摩擦系数随着样本尺寸的减小而减小。因此，MHDD 可以诱导 OLP 中的流体动力润滑和润滑，并通过施加适当的流体压力来改善微成型中的摩擦学行为。
In this paper, the tribological behavior and its size effects in micro–hydromechanical deep drawing (MHDD) are theoretically and experimentally investigated. It is found that a required fluid pressure for hydrodynamic lubrication significantly increases with scaling down micro–scale due to a high sealablity at small relative punch diameter to minimum thickness. Moreover, the opposite tribological size effect from a conventional microforming appears in MHDD in which the fluid medium can be kept in open lubricant pockets (OLPs) by applying a fluid pressure and, the friction coefficient decreases as a specimen size decreases. Thus, MHDD can induce the hydrodynamic lubrication and lubrication in OLPs and improve the tribological behavior in microforming by applying the appropriate fluid pressure.