Punch press device

Details Punch press device Punch press device

1995-08-28

1997-12-23

Peterson, Kenneth E.

Cutting

By tool inside hollow work

With expanding mandrel

83192, 836395, 83687, B23D 2114, B26F 114

Patent

active

056997086

ABSTRACT:
The invention provides a punch press capable of impressing a plurality of holes or other changes in a workpiece. The central core piece of the punch press receives the workpiece and expands until it touches the inner walls of the workpiece. This holds the workpiece in place and prevents any workpiece movement or distortions in the holes formed because of movement of the workpiece. Hydraulic cylinders impel the plurality of punches toward the workpiece at substantially the same pressure and time.

REFERENCES:
patent: 1503551 (1924-08-01), Nice
patent: 1595678 (1926-08-01), Murphy
patent: 2231638 (1941-02-01), Rigdon
patent: 2325437 (1943-07-01), Temple
patent: 2423791 (1947-07-01), Nelson
patent: 2884066 (1959-04-01), Teplitz et al.
patent: 4030391 (1977-06-01), Swanson et al.
patent: 4524660 (1985-06-01), Yonezawa

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