Method of rolling angle structural shapes
AssigneeARBED Acieries Reunies de Burbach-Eich-Dudelange, Societe Anonyme
InventorFernand Schmitz
Life of this patent
Estimating the term…
Abstract
A method of rolling angle structural shapes in which a bar of rectangular ofile is rolled in a first step to form a blank having a rounded convex protuberance on one side and a flat opposite side. In at least one subsequent state, the blank is rolled to transform the protuberance or hump into a triangular protuberance or ridge with flanks lying substantially at a right angle, whereupon the blank is bent, after rounding the edges of the flat surface, to form the angle profile.
Claims8
A process for the rolling of a structural shape having two flanges joining at substantially a right angle the process consisting of:
- (a) rolling a rectangular-section bar to form at least one convex bulge along a surface of a resulting rolled blank and a pair or wings separated by said bulge and of a thickness of about one-half the thickness of said bar, said blank having a flat planar unrecessed surface on its side opposite said bulge;
- (b) thereafter in a second pass rolling said blank to reduce the thickness of said wings to about one third the thickness formed in step (a) and to transform said bulge into a triangular-section ridge while maintaining a flat planar unrecessed surface on the side opposite said ridge;
- (c) rolling the blank of step (b) in a third pass to round outer edges along a surface of said blank opposite the surface on which said ridge is formed while maintaining a flat planar unrecessed surface on the side opposite said ridge between the rounder outer edges;
- and
- (d) after step (c) and without intervening steps bending said wings at a right angle to one another whereby said ridge forms a vertex between flanges of a structural shape resulting from the bending.
Dependencies are inferred from the claim text.