To provide a hydraulic cushioning device that is simply structured so as to be integrated with a metallic die mechanism, that dispenses with space for an oil pressure supply system and for piping, and that is capable of reducing price.
A forging device 40 is provided with a cylinder 64 in the lower die holder 56, with a lower die 90 supported through a pin member 88 on a piston 80 that slides inside the cylinder 64. The upper part of the lower die holder 56 is provided with a holding plate 114, to which a relief valve 120, check valve 122 and oil tank 130 are fixed. The cylinder 64, relief valve 120 and check valve 122 are connected with passages 86, 110, 118 formed in the lower die holder 56, while the relief valve 120, check valve 122 and oil tank 130 are connected with a passage 124 formed on the holding plate 114.
| JP2703024 | [Title of Invention] Die Spring |
| WO/2004/094084 | CUSHION ASSEMBLY AND METHOD |
| JP4540930 | Cushion device for press machines |
MOMOSE KIMIO
AKIYAMA YOSHIRO
YAMANE SHUICHI
MINOWA AKIHIKO
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