Die cushion apparatus

Details Die cushion apparatus Die cushion apparatus

B - Operations, Transporting

30

B

B30B 15/02 (2006.01) B21D 24/02 (2006.01)

Patent

CA 2390044

A gas cushion apparatus with a support member to hold a blank, gas pressure cylinders that push the support member upwards, a hydraulic cylinder whose upper rod is connected to the support member, a pneumo-hydraulic converter for secondary lifting with a piston that partitions the interior into an oil chamber communicating with the oil chamber on the side of the rod of the hydraulic cylinder and a gas chamber, a check valve that allows oil to flow from the oil chamber on the side opposite to the above-mentioned rod to the oil chamber on the side of the aforementioned rod, and a drain port communicating with the oil chamber on the side of the above-mentioned rod of the hydraulic cylinder.

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