深絞り加工の薄肉化技術に関する研究 : 第1報, ストレッチドロー法における成形条件の実験的検討

概要

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A new deep drawing process for laminated sheet metal is developed to eliminate unfriendly environmental factors from a can manufacturing system. This new dry forming process is carried out without using coolant/lubricant and take advantage of the good sliding property of polyester film. The main purpose of the stretch draw forming is to reduce the thickness of the body walls by more than 20%. From Experimental results on wall thickness reductions, optimum regions of die radius and blank holder radius in the stretch draw forming are determined as 1.1 <Rd/to<3 and 4<Rh/to<12, respectively. As far as any wrinkling or breakdown occurs, a higher backward tension on the body wall, which can be controlled by the blank holding force, is effective to achieve a high reduction in cup wall thickness. The limiting reduction rate of wall thickness is related to the material strength.
一般社団法人日本機械学会の論文
1996-08-25