厚板材の深絞り加工における逆圧荷重の効果

概要

論文の詳細を見る
With a view to regarding deep drawing as a new process for fabricating bottomless tubular elements, a deep drawing test was conducted with thick aluminum material. The test machine had two hydraulic actuators : one for the ordinary deep drawing process, and another for the opposite force. To increase the cup wall height, the opposite force was loaded on the bottom part of the aluminum blank throughout the entire process. The limiting drawing ratio decreased with the increase of the opposite load level, since the opposite force caused stretch-type fracture at the bottom part. But when drawing ratio was under the limiting drawing ratio, and when opposite force was under the limiting opposite force, the cup height could be increased by reducing the bottom thickness, because the lost volume of the bottom part compensated for the wall part.
一般社団法人日本機械学会の論文
1993-04-25