The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 1994
Filed:
Apr. 27, 1993
William T Saunders, Weirton, WV (US);
Weirton Steel Corporation, Weirton, WV (US);
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).