液圧張出・逆張出・しごき複合加工による軟質純アルミニウム容器の張出高さの向上
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概要
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In the stretching process, it is important to prevent the sheet thickness from thinning locally at punch shoulder and to decrease the thickness as uniform as possible. Then, if the material around the die hole is poured into the hole, the height of the cup is expected to rise more. From that point of view, a combined process of punch stretching, reverse stretching and ironing has been proposed using rubber punch. However, in that process, it was difficult to thin the sheet thickness uniformly especially on the punch head mainly due to the existence of frictional force. In this study, a new combined process of hydraulic bulging, reverse bulging and ironing was devised, and the increase in the height of cup with wide flange was attempted. In the experiment, the sheet thickness around the second die hole was thinned effectively by the hydraulic bulging, and the material corresponding to the decrease of the thickness was enabled to pour into the die hole by the following reverse bulging. However, to make the process successful, it was necessary to use a counter punch with contour like arc, and to press a wrinkle into the die-hole by using an assist punch after the reverse bulging. After additional ironing, the thickness strain of the formed cup could be distributed on the punch head more uniformly than which is formed by the process proposed previously. As the result, a cup with wide flange having the diameter of 41.5 mm and the height of 33.0 mm could be obtained.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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