Experimental Investigation And Numerical Simulation Of Micro Deep Drawing

The production of miniature parts is gaining importance due to the trend of miniaturization, which is increasingly determining the development of product ranging from mobile phones, computers and micro digital camera to medical products and so on. The application of conventional manufacturing processes for the production of such micro-parts is possible, but, when the dimensions of components getting smaller and smaller, many physical phenomena which are different from macro world will occur, and the traditional theories should be modified. Therefore it is very important to develop the theories and experimental methods accordingly. In this thesis, a basic research of micro deep drawing to find some characteristics and die design method in the area was accomplished by experimental investigation and numerical simulation.Size effects and its theoretical explanation are systematically introduced in this thesis. Many experiments have shown that materials display strong size effects when the characteristic length scale associated with non-uniform plastic deformation is in the order of microns. In these experiments, the two main size effects could be identified, the size effect on material flow and the one on friction. The mechanical properties of thin sheet copper of below 0.2mm thickness were obtained by a simple tensile testing. In the tensile testing, the size effect on material flow was valid, that is, the flow stress decreases with the decrease in thickness of sheet.In this thesis, an experimental study of micro deep drawing process for three different...