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Influence of Microstructure Strengthening on Shape-Freezing Property of Press Forming
Published May 19, 2010 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
The purpose of this study is an experimental proof of the form forming method's utility on the press working. In particular, we had much attention to an influence of micro structural strengthening of steel sheet on the form forming method and a comparison to draw forming method. The division of form forming process resulted in high accuracy on a shape freezing property of formed specimen. Moreover, the process division effectively decreased the working load. The shape freezing property of form forming was better than that of the draw forming. On the second form forming process in two steps forming, the principal forming mechanism was the push bending which was the fundamental role on the form forming process. On the draw forming, the unbending occurred. Because of the unbending, the shape freezing property became worse and the working load increased. The difference of forming mechanisms between the form forming method and the draw forming method could be evaluated by the residual stress and in the press worked products. The micro structural strengthening of formed steel sheets had much influence on the shape freezing property.