Experimental and numerical investigation on micro deep drawing process of stainless steel 304 foil using flexible tools
Experimental and numerical investigation on micro deep drawing process of stainless steel 304 foil using flexible tools
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DOI：
10.1016/j.ijmachtools.2013.09.006
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发表时间：
2014-01-01
影响因子：
14
通讯作者：
Kriama, Abdulbast
中科院分区：
文献类型：
--
作者：
Irthiea, Ihsan;Green, Graham;Kriama, Abdulbast
柔性成形技术在制造业的各个领域，特别是在小型化水平上提供了巨大的应用潜力。工艺的简单性、通用性和原型的可行性使得使用柔性工具的成形技术适用于微细金属板的成形。本文报道了利用柔性模具对304不锈钢薄板微拉深工艺进行有限元模拟和实验研究的结果。本研究提出了一种新技术，在已开发的成形系统中，在调整环和压边架之间采用初始间隙（正间隙或负间隙）。压边架是可移动部件，由提供所需压紧力的特定弹簧支撑。详细研究了与成形工艺有关的各向异性、初始间隙、不同接触界面的摩擦条件和初始板厚等成形参数。有限元模型是使用商业代码Abaqus/Standard构建的。数值预测结果表明，该工艺具有生产高质量、大宽高比微金属杯的能力。为了验证这些结果，使用为此目的开发的特殊装置进行了大量的微深拉深实验。由于需要对这种新型成形技术的商业开发提供基本的了解，因此根据每种板材厚度，厚度分布和冲床力/行程关系来优化初始间隙。(C) 2013 Elsevier Ltd.版权所有。
Flexible forming technology provides significant application potential in various areas of manufacturing, particularly at a miniaturized level. Simplicity, versatility of process and feasibility of prototyping makes forming techniques by using flexible tools suitable for micro sheet metal forming. This paper reports the results of FE simulation and experimental research on micro deep drawing processes of stainless steel 304 sheets utilising a flexible die. The study presents a novel technique in which an initial gap (positive or negative) is adopted between an adjustment ring and a blank holder employed in the developed forming system. The blank holder is moveable part and supported by a particular spring that provides the required holding force. The forming parameters (anisotropy of SS 304 material, initial gap, friction conditions at various contact interfaces and initial sheet thickness) related with the forming process are in details investigated. The FE models are built using the commercial code Abaqus/Standard. The numerical predictions reveal the capability of the proposed technique on producing micro metallic cups with high quality and large aspect ratio. To verify these results, number of micro deep drawing experiments is conducted using a special set up developed for this purpose. As providing a fundamental understanding is required for the commercial development of this novel forming technique, hence the optimization of the initial gap in accordance with each sheet thickness, thickness distribution and punch force/stroke relationship are detected. (C) 2013 Elsevier Ltd. All rights reserved.