Draw-process methods, systems and tooling for fabricating one-pi

Details Draw-process methods, systems and tooling for fabricating one-pi Draw-process methods, systems and tooling for fabricating one-pi

1993-04-27

1994-09-20

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72348, 72349, 72467, B21D 2200

Patent

active

053478398

ABSTRACT:
New tooling technology for deep drawing one-piece can bodies from flat-rolled sheet metal can stock (58) which is precoated on both surfaces with an organic coating and draw lubricant. A draw die curved-surface cavity (122) entrance is formed using a radius of curvature (132) with a practical maximum of about five times nominal sheet metal thickness gage; and, preferably is formed about multiple radii of curvature (R.sub.L, R.sub.S, R.sub.L) to increase surface area (140) without increasing projection on the clamping plane. Die cavity wall (156) is tapered about 1.degree. to provide increasing cross section with increasing penetration of draw punch (160). Redraw die (90) has a sleeve-like configuration in a cross-sectional plane which includes its central longitudinal axis (70); such configuration enables increase in production rate by enabling coaxial relative movement of such die into work product registry (98,99) which position cups for redraw. The outer juncture (168) of such die sleeve is also formed about multiple radii of curvature (174, 180); and, the clamping space, between respective planar surfaces (96, 104) of die (90) and clamping ring (101) is tapered so as to decrease in vertical cross section in approaching die cavity (62).

REFERENCES:
patent: 4228673 (1980-10-01), Scheel
patent: 4425778 (1984-01-01), Franek
patent: 4485663 (1984-12-01), Gold et al.
patent: 4522049 (1985-06-01), Clowes
patent: 4584859 (1986-04-01), Saunders
patent: 5014536 (1991-05-01), Saunders

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