Double acting precision deep-stamping press

Details Double acting precision deep-stamping press Double acting precision deep-stamping press

1978-12-21

1980-01-15

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72481, B21D 2228

Patent

active

041832388

ABSTRACT:
A double-acting press for precision deep-stamping requiring a plurality of passes comprises two tool assemblies arranged coaxially facing one another. The first tool assembly is constituted by a hollow stem double-acting hydraulic stamping jack, the head of which contains a cascade of annular dies, one for each pass required, of internal size decreasing from the first pass die situated at the free end of the head. The first pass die bears on its front leading surface the male blank-cutting punch and the spacing of the leading surfaces of two successive dies is at least equal to the height of the blank after its passage through the first of said two dies. A second hydraulic jack, called a central jack whose body is fast to and coaxial with that of the stamping jack has its stem passing coaxially through the hollow stem and the head of the latter. The second tool assembly is constituted by a plurality of coaxial tubular punches, one for each die, conjugated respectively with the male blank-cutting punch and the successive dies until the penultimate die. These tubular punches slide within one another around a central punch for the last pass whose end is arranged to cooperate with that of the stem of the central jack to grip the central part of the blank firmly throughout the forming process. The central jack of the first tool assembly is a double-acting jack while the tubular punches of the second tool assembly are constituted by telescopic tubular pistons of a same jack, called a single-acting hydraulic retaining jack. The central punch of the last pass is a fixed central stem. The tubular pistons are arranged to present their free ends at the level of the end of the fixed central stem when the retaining jack is at the end of its active stroke.

REFERENCES:
patent: Re20009 (1936-06-01), Hothersoll
patent: 1453652 (1923-05-01), Auble
patent: 3453848 (1969-07-01), Williamson
patent: 3707086 (1972-12-01), Berg
patent: 3733879 (1973-05-01), Brown et al.

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