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Shape-Freezing Property of Nonferrous Metal on Press Forming
Published October 12, 2011 by Society of Automotive Engineers of Japan in Japan
In this research, we used five types of non-ferrous metallic materials to compare and evaluate shape fixability obtained using three methods of press molding (drawing, one-stage forming, and two-stage forming). Results of this study and those obtained in previous studies using ferrous steel materials indicate the following: (1) For all the five types of non-ferrous metallic materials, the two-stage forming process showed in superior shape fixability. This shows that the two-stage forming process could be an effective means for press-working of special or non-conventional metals. (2) Press-working of non-ferrous metallic materials using drawing, one-stage forming process, and other conventional methods used in press-working results in shape fixability different from that of ferrous steel materials. As such, formability could not be assessed using only mechanical property values used as evaluation indices for ferrous materials. (3) Unlike ferrous materials, non-ferrous metallic materials do not exhibit correlation between tensile strength and extensibility. Likewise, they also exhibited yield strengths and n-values different from those of ferrous materials.