異なる板厚形状を有する７４７５アルミニウム合金板材の超塑性ブロー成形
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概要
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A new superplastic blow forming procedure for 7475 aluminum alloy sheets to provide the optimum distribution of thickness to a slender pan. The procedure adopts a preliminarily machined blank with different thickness locally before a superplastic forming (SPF). The figure and thickness for machining is calculated by a numerical analysis method developed for the pan to be formed with the optimum shape, size and thickness. This procedure also contains a friction between a sheet and a die, and work hardening of a blank material during SPF. It feeds the optimum pressurization schedule to the preliminarily machined blank to be formed with the maximum strain rate. A SPF of 7475 aluminum alloy sheets machined preliminarily to be formed a rectangular pan, in the ratio of the bottom to wall thickness is 2:1, according to the numerically calculated pressurizing schedule. The distribution of thickness in the formed pan was coincident with that of expected one.
- 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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