Patent ID: 9227238
Filing Date: 2016-01-05
CPC Classification: B21D

Claim Text:
1. A hot-pressing apparatus comprising a lower die having a lower forming surface, and an upper die having an upper forming surface facing the lower forming surface, which causes the lower die and the upper die to press a heated workpiece arranged therebetween, and at the same time, to keep the forming surfaces thereof in contact with a surface of the workpiece to cool the workpiece, the improvement comprising: a depression part recessed inward from each of the lower forming surface of the lower die and the upper forming surface of the upper die such that the depression part does not directly contact the workpiece while the workpiece is being pressed, the depression part in the lower die is formed at a part of the lower die which faces an external corner of the upper die acting as a working part for bending the workpiece, and the depression part in the upper die is formed at a part of the upper die which faces an external corner of the lower die acting as the working part; a water-feed channel through which cooling water for cooling the workpiece flows, and which is formed inside the lower die and the upper die from the forming surface to a surface thereof other than the forming surface; and a water-feed device that feeds the cooling water, through the water-feed channel, to a space between the workpiece and the lower die and the upper die where the depression part is formed.