Punch press

Details Punch press Punch press

1989-02-03

1990-12-18

Yost, Frank T.

Cutting

With control means responsive to replaceable or selectable...

Arithmetically determined program

83 98, 83129, 83169, 83684, B21B 2834, B21B 4504

Patent

active

049778048

ABSTRACT:
A punch press having a die formed with a diehole and mounted on a die holder and a punch set provided with a punch mounted on a punch holder for performing a punching process on a workpiece in cooperation with the die. The punch set is formed with a fluid discharge orifice for discharging a fluid into the diehole, and the punch is formed with a communication orifice communicating with the fluid discharge orifice. A ram for striking the punch is formed with a fluid supply orifice for freely communicating with the communicating orifice. A connecting pipe connects the fluid supply orifice with a fluid source; a shut-off valve is provided for opening or shutting of the connecting pipe, with a stroke position detector for detecting the stroke of the ram. A shut-off valve control is provided for controlling the opening or shutting of the shut-off valve according to the values detected by the stroke position detector.

REFERENCES:
patent: 2251135 (1941-07-01), Iknayan et al.
patent: 2313525 (1943-03-01), Edelman
patent: 3550491 (1970-12-01), Wingard
patent: 3771396 (1973-11-01), Imi
patent: 4628780 (1986-12-01), Hicks
patent: 4771663 (1988-09-01), Naito et al.

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