US 4,578,979 AGranted

Method of producing a strip having a non-uniform cross section by a rolling process

AssigneeHitachi Cables, Ltd.

InventorsHajime Abe, Noboru Hagiwara, Kazuo Ishida, Tadao Otani, Osamu Kawamata, Manabu Kagawa

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Abstract

A method for producing a strip of material having a non-uniform cross section is carried out by passing a strip of material in the longitudinal direction through a first set of working rolls, at least one of which is provided with an annular slot intermediate the ends thereof so that a reducing force is applied only to those portions of the strip engaging said roll on opposite sides of the slot whereby the excess material flows toward that portion of the strip opposed to the slot to cause the strip to buckle outwardly into the slot. The strip is subsequently passed through a set of smooth rolls to flatten the buckled portion. This procedure is repeated any desired number of times with the width of the slot becoming progressively smaller. The strip may then be passed through one or more sets of finishing rolls and a heating and annealing operation can take place before each passage through a set of finishing rolls.

Claims6

Dependent claims

A method for shaping a substantially continuous strip of material having a substantially uniform cross section into a substantially continuous strip having a non-uniform cross section defined by at least one thick section and two thin sections on opposite sides of said thick section, comprising the steps of:

passing said continuous strip having a substantially uniform cross section in the longitudinal direction through a first pair of reduction rolls, at least one of which has an annular slot intermediate the ends thereof, to provide a reducing force to reduce the thickness of only those portions of said strip engaging said roll on opposite sides of said slot, said passing step including the provision of sufficient reducing force on said engaging portions of said strip to cause the unengaged portion of said strip to form a buckled portion in said slot, and
passing the strip coming through said first pair of rolls through a second pair of reduction rolls, each having a smooth cylindrical surface, to roll said buckled portion to a predetermined thickness, thicker than the remaining portions of said strip.

Dependencies are inferred from the claim text.