Investigation and characterization of size effects in microforming processes
Investigation and characterization of size effects in microforming processes
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发表时间：
2008
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S. Parasiz
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作者：
S. Parasiz
新罕布什尔州的Sunal Ahmet Parasiz大学，2008年12月微型化的产品，如移动的电话、个人数字助理、计算机和其他电子设备已经成为我们日常生活中不可或缺的一部分。如今，越来越多的工业产品，包括一些医疗和机电产品，包含微型金属部件，如连接器引脚，电阻帽，螺钉，接触弹簧和芯片引线框架。小型化带来了实现这些微型金属部件生产的挑战。微成形由于其众所周知的高生产率、优异的材料利用率和低成本的优点，与该领域的替代工艺相比是一种有前途的制造方法。然而，成熟的常规宏观尺度金属成形工艺不能简单地小型化而不考虑可能的尺寸效应。这项研究的目的是确定是否发生变形尺寸效应与小型化。通过对微挤压和微弯曲两种工艺的研究，考虑了试样尺寸和晶粒尺寸的变形尺寸效应。在这两种成形工艺中，通过试样的横截面产生变形梯度。为了分析这些变形尺寸效应，
INVESTIGATION AND CHARACTERIZATION OF SIZE EFFECTS IN MICROFORMING PROCESSES by Sunal Ahmet Parasiz University of New Hampshire, December 2008 The products of miniaturization, such as mobile phones, personal digital assistants, computers and other electronic devices have become an indispensable part of our daily lives. Nowadays, more and more industrial products including some medical and electromechanical products contain micro scale metal parts such as connector pins, resistor caps, screws, contact springs and chip lead frames. Miniaturization brings the challenge of realizing the production of these microscale metals parts. Microforming, due to its well known advantages of high production rates, excellent material utilization, and low costs, is a promising manufacturing method compared to the alternative processes in this field. However, well-established conventional, macroscale metal forming processes can not simply be miniaturized without considering possible size effects. The goal of this research was to determine if deformation size effects occur with miniaturization. Both deformation size effects with respect to specimen size and grain size were considered through the investigation of two processes, microextrusion and microbending. In both of these forming processes, deformation gradients are generated through the cross-sections of the specimens. To analyze these deformation size effects,