T. Umemura
,
Y.Zhou
,
S.Kamimura
,
N.Motoi
,
Y Ohta
,
N. Yamaguchi
材料科学技术（英文）
The die motions of a new forging process for automation with an intermediate die assembly called hamburger were analyzed through high-speed video pictures. The results showed that the upper die that is assembled in the hamburger and retained over the lower die collides few times with the ram and workpiece, but sound products can be obtained with less sticking in spite of the lowered impacts of hit.
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