Flow stress and tribology size effects in scaled down cylinder compression
Flow stress and tribology size effects in scaled down cylinder compression
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DOI：
10.1016/s1003-6326(10)60100-8
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发表时间：
2009-09-01
影响因子：
4.5
通讯作者：
Shan De-bin
中科院分区：
文献类型：
--
作者：
Guo Bin;Gong Feng;Shan De-bin
微成形是制造小型金属零件的一种有效方法。然而，由于尺寸效应的影响，宏观成形不能直接转化为微观成形。研究了流变应力和摩擦学尺寸效应。按比例缩小的铜T2气缸压缩在蓖麻油润滑和无润滑的情况下进行。结果表明，在两种润滑条件下，流动应力均随试样初始直径的减小而减小，当试样初始直径从8 mm减小到1 mm时，流动应力减小约30 MPa;在蓖麻油润滑条件下，摩擦因数随试样初始直径的减小而明显增大。摩擦系数随试样初始直径从8 mm减小到1 mm而增大0.11。而在无润滑条件下，没有发现摩擦学尺寸效应。讨论了流动应力和摩擦学尺寸效应产生的原因。
Microforming is an effective method to manufacture small metal parts. However, macro forming can not be transferred to microforming directly because of size effects. Flow stress and tribology size effects were studied. Scaled down copper T2 cylinder compression was carried out with the lubrication of castor oil and without lubrication. The results show that the flow stress decreases with decreasing the initial specimen diameter in both lubrication conditions, and the flow stress decreases by 30 MPa with the initial specimen diameter decreasing from 8 mm to 1 mm. The friction factor increases obviously with decreasing the initial specimen diameter in the case of lubricating with castor oil, and the friction factor increases by 0.11 with the initial specimen diameter decreasing from 8mm to 1mm. However, the tribology size effect is not found in the case without lubrication. The reasons of the flow stress and tribology size effects were also discussed.