Method for punching a cylindrical tube

Details Method for punching a cylindrical tube Method for punching a cylindrical tube

1987-06-15

1988-06-14

Yost, Frank T.

Cutting

Processes

With subsequent handling

83 54, 83 55, 83123, 83191, 83590, 83618, 83623, B21D 2828

Patent

active

047503939

ABSTRACT:
A method of punching cylindrical tubes with openings from the inside to the outside. In accordance with the method, the punching apparatus includes a mandrel that slidably supports the dies and a backup die that includes a slug ejecting punch which serves the dual function of ejecting the slugs from the backup die and also retracting the punches.

REFERENCES:
patent: 1432073 (1922-10-01), Lowy
patent: 1764129 (1930-06-01), Trumble et al.
patent: 3084580 (1963-04-01), Schmid

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