JPS5614004A

JPS5614004A - Rolling method for metallic sheet

Info

Publication number: JPS5614004A
Application number: JP9000579A
Authority: JP
Inventors: Hiroyuki Hino; Hidehiko Tsukamoto; Junichi Iifushi; Nobutaka Maeda; Ryuichi Osono
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 1979-07-16
Filing date: 1979-07-16
Publication date: 1981-02-10
Also published as: JPS6342521B2

Abstract

PURPOSE: To improve the yield of material at head and tail ends of the rolled material, by setting the roll gap at a size larger than the roll gap of the final roll, and by reducing the roll gap to the size of the final rolls' just at starting the rolling work, and by performing the rolling work.

CONSTITUTION: At edging the metallic material, first of all, the gap of the rolling roll 2 in the breadth direction is set at the size of the roll gap for the initial rolling reduction. The initial rolling reduction is represented by Δh₁=R(1-cosθ) (in which, R is the roll's radius and θ is the angle of bite under the initial reducing condition), besides, the relation 2Δh₁≥rW₀ (in which, W₀ is the sheet breadth before the rolling work, and (r) is the breadth reducing rate) is established. After the rolling work is started, at the point of time that the rolled material's tip passes the center of the roll 2, the screw down device of the roll 2 is driven to reduce the roll gap to the final reducing gap according to the signal of the detector so as to satisfy the relation, that is the roll gap reducing time T=(aW₀)/V (in which, (a) is the value obtained by dividing the slab length required in reducing the rolling reduction from Δh₁ to Δh₂ by the sheet breadth W₀, and V is the circumferential speed of the roll 2); hereby, the purpose can be accomplished.