Study on the Size Effect and the Effect of the Friction Coefficient on the Micro-extrusion Process
Study on the Size Effect and the Effect of the Friction Coefficient on the Micro-extrusion Process
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DOI：
10.1007/978-3-540-73374-4_58
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
F. Liu;Linfa Peng;X. Lai
中科院分区：
文献类型：
--
作者：
F. Liu;Linfa Peng;X. Lai
随着产品不断小型化，对机械微型零件精确成形工艺的开发需求越来越大。然而，在微成形过程中，尺寸效应的出现使得通常成形过程的知识不能直接使用。本文通过单轴拉伸实验研究了H62的尺寸效应，结果显示了晶粒尺寸效应和特征尺寸效应。根据张力数据，LS-DYNA 用于分析微挤压过程。模拟结果表明，摩擦条件严重影响微成形过程。当摩擦条件发生变化时，变形材料的应力状态也会发生变化。随着摩擦系数的增大，挤压力迅速增大
With the ongoing miniaturization in products, there is a growing demand for the development of accurate forming process for mechanical micro-parts. However, in microforming process, the size effects come up and make the knowledge of the usual forming process can not be used directly. This paper investigates the size effect of H62 with the uniaxial tension experiments, and the results show both the grain size effect and the feature size effect. On the basis of the tension data, the LS-DYNA is used to analysis the micro-extrusion process. The simulation results show that the friction condition affect the microforming process seriously. When the friction condition changes, the stress state of the deformed material also changes. With the increasing of the friction coefficient, the extrusion force increases rapidly