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:
Mar. 15, 1988
Filed:
Mar. 14, 1986
Robert E Welsh, Mount Lebanon, PA (US);
Aluminum Company of America, Pittsburgh, PA (US);
Abstract
Apparatus and method for determining the fracture resistance of thin wall hollow articles when ironed, the method including the step of providing a drawing die and punch or a mandrel having a portion thereof tapered in a continuous, linear manner. The taper is such that it provides a continuous decrease in punch-to-die clearance when the two are moved together, and thus a continuous range of ironing reductions along the side wall of an article located between the punch and die. The taper of the punch begins adjacent the forward end thereof and is sized to effect conventional thinning of the side wall of the article at the onset of ironing. The final diameter of the taper of the punch, however, is such that fracturing of the side wall is assured in the ironing process.