US 4,528,836 A · Process for changing the cross-section of a band of malleable material such as copper

Abstract

A cold metal working process gradually changes the cross-section of a copper band to a wider band having one or more sections of reduced thickness. A hammering tool having a chevron-like protrusion, formed by two convergent elongate ridges with long and narrow flat crests, performs a succession of elemental hammered compressions on the band. The metal band, between blows of the hammering tool, is advanced toward the wider part of the chevron-like protrusion and enables the reduced thickness section to be progressively widened by hammering, with the long flat crests of the two ridges, on narrow strips of the portions of the band adjacent to the reduced thickness section. The material displaced from the hammered indentation at each elemental compression of the narrow strip is displaced substantially laterally and results in a widening of the band without an appreciable increase in the initial thickness of the other portions of the band's cross-section.

Claims9

Dependent claims

A cold metal working process for transforming the cross-section of a band, especially of copper to obtain a cross-section having a portion of reduced thickness, without machining to remove material, the process comprising the steps of

(i) causing the band to intermittently advance lengthwise relative to a hammering tool between blows of that tool, the hammering tool having at least one protrusion formed by two ridges converging to an apex in the direction opposite to the direction of advance of the band, each of the ridges having an elongate flat crest whose width is small in relation to its length,
(ii) causing the hammering tool to perform a succession of elemental hammered compressions of which each involves compression by said protrusion along a length of the band that is long compared to the fraction of the width of the band which is reduced in thickness, the fraction of width of the band reduced by each elemental hammered compression being a small fraction of the width of the part whose thickness is to be reduced, each elemental hammered compression causing progressive widening of the part of reduced thickness with the adjacent parts retaining their initial thickness, whereby the successive elemental compressions cause incremental displacement of material in the transverse direction of the band so that, in the zone worked by the hammering tool, the cross-section of the band evolves progressively in the direction of advance from the initial cross-section to the final cross-section.

Dependencies are inferred from the claim text.

Process for changing the cross-section of a band of malleable material such as copper

Life of this patent

Process for changing the cross-section of a band of malleable material such as copper

Life of this patent

Abstract

Claims9