Huge, perfectly preserved toe bone fossils and even a single curved nail, larger than a human hand, were found with a rib and leg and possibly pelvic bones.
The die was curved surface held down. The position of drawing rib was determined according to the analysis on the wrinkling trend of sheet bar made by DYNAFORM software.
此模具的压料面为曲面压边，并利用DYNAFORM分析板料的起皱趋势，确定拉伸筋的位置。
3
The groove wall 61 on the side with shoulder rib is connected with the groove bottom deepest part 71 in that condition by the curved surface part 75 on the side with shoulder rib.