【作者】 张军；

【导师】 董湘怀；

【作者基本信息】 华中科技大学 ， 材料加工工程， 2005， 硕士

【摘要】 微电子技术的巨大成功引发了一场微型化的科技革命, 因微细产品可应用于军事、航天、信息、医学、工业和农业等众多领域,各个国家相继投入大量人力、物力开展了对微细成形技术的研究。而当零件尺寸缩小到一定范围时,许多物理现象与宏观世界有很大差别,一些常规理论将作修正,因此微观尺度下的理论和实验研究显得格外重要。本文通过实验和有限元分析的方法对微细塑性成形进行了基础研究,找出微细塑性加工中一些变化特点。本文首先详细介绍了国内外微细加工技术发展的概况,同时介绍了微细加工技术的特点及方法,随着MEMS,LIGA 等微细加工技术的发展,不同的微细加工技术应用于各行各业,然而微细塑性成形技术现在仍然处于理论研究阶段。德国、美国等专家相继进行了微细塑性成形的实验研究,并得到了许多相应的微细塑性成形理论。而我国在这方面的研究刚刚起步且比较分散,没有形成系统的理论。另外本文介绍了微细塑性成形的理论及方法,由于尺度的变小,微细加工中尺度效应明显,因此对尺度效应的理论及实验研究是微细加工的重点。而且由于尺度变小,产品加工更为困难,因此我们需要找到更多的微细塑性加工方法。此外本文利用无模成形技术对薄铜板进行加工,得到微小的产品,探索了一种新的微细塑性加工方法。另外本文通过对薄铜板及薄铝板进行胀形实验,找出了在微细胀形加工中,薄铜板及薄铝板的应力应变变化规律,并对这一规律进行理论分析。另外本文通过有限元模拟方法与实验结果相对比,对实验结果给出了理论解释。更多还原

【Abstract】 The success of micro-electronics leads to a revolution in micro motion. Since the micro-manufacturing can apply to military affairs, space flight, information、astrology、industry, agriculture,etc. Lots of people and material resources have been devoted to the investigation of microforming in many countries. When the dimension of component are getting smaller and smaller, many physical phenomenon which are different from macroscopic world will occur, and the traditional theory should be modified. Therefore it is very important to develop the theory and experimental method accordingly. In this thesis, using experimental method and finite-element analysis, a basic research for microforming to find some characteristics in the area is accomplished. Firstly, the domestic and overseas developments of microforming, especially the characteristics and technology in this area, are introduced in detail. With the developments of MEMS, LIGA, different microforming technology has been applied in many fields. The technology of microforming, however, is still under theoretical investigation. The experts in Germany and America processed a series of examination research and made some progress. The research in this area in China is still a new subject and under the initial step. The theory concerning this field has also not been systematized. Then, the theory of microforming is introduced in detail. Since the size effects are very obvious with the diminution of dimension, the research of size effects is the emphases of microforming. Further more, with the diminution of dimension, it is more difficult to produce product. So more microforming method should be developed. Through the processing of thin sheet copper with numerical controlled single-point incremental forming machine,micro-products are obtained, which is a new way of microforming. In micro stretch forming experiments using thin sheet copper and aluminum, stress and strain distribution are investigated. Finally, finite element analysis of the micro stretch forming processes are carried out and the results are compared with the experimental results.更多还原