抄録
This paper is described about the study on Finite Element Method (FEM) analysis of thin steel sheet bending. Thin steel sheet bending is used as hemming process in automobile industry. Hemming process is one of the thin metal plate bending process for joining the outer panel to the inner panel. Recently the required accuracy is increasing. Hemming process is a simple plastic forming process, however some defects often are occurred such as creepage, growing, warp, recoil and so on. Some studies on hemming process, however these occurring mechanism are not clarified yet. Moreover, selecting hemming process conditions takes cost and time. Therefore, in order to solve these problems, hemming process is reproduced in FEM analysis. For accuracy FEM analysis, it is necessary to give a material properties value correctly. Tensile test and friction test were operated to obtain the flow stress and friction coefficient in preliminary experiment for accuracy FEM analysis. Therefore, in this research the material properties of a specimen are acquired, the metal thin sheet bending that based on the acquired data and FEM analysis of processing are conducted, moreover the experiment and analysis are compared and considered from a load-stroke diagram. Both tendency was good agreement. From this result, coincidence of load-stroke diagram of an experiment and analysis was obtained and it was able to say that it was useful in the FEM analysis of this experiment.
