Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1978-10-16
1981-02-17
Gilden, Leon
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72359, 72370, B21D 2200
Patent
active
042507316
ABSTRACT:
A method of producing trimming dies with a conical many-sided bore for use in a screw trimming press. A trimming die blank is produced with an outer diameter corresponding to the inner diameter of a cup-shaped holder and to a finished height and with a cylindrical inner bore. The many-sided bore is produced by cold deformation of the inner diameter by means of a many-sided punch introduced to a limited extent into the inner bore while preserving the outer diameter. Apparatus for carrying out the method includes a holder for the trimming die blank. A spacer ring located below the blank and resting on the base of the holder in use, a guide sleeve and a many-sided punch guidable by said guide sleeve and having a length exceeding that of the guide sleeve by an amount corresponding to a predetermined insertion depth of the punch in the blank. The base of the holder has an ejector bush with an ejector mandrel.
REFERENCES:
patent: 2168300 (1939-08-01), Lemming
patent: 2621344 (1952-12-01), Friedman
patent: 2627652 (1953-02-01), Schweller
patent: 3138257 (1964-06-01), Anderson
patent: 3434326 (1969-03-01), Serret
patent: 3455138 (1969-07-01), Zopf
Dennemeyer John J.
Gilden Leon
Sack & Kiesselbach Maschinenfabrik GmbH
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