JPS5588943A - Rolling method of shape section bar and plate - Google Patents

Abstract

PURPOSE: To continuously mold the shape section materials by disposing a plurality of rolling rolls consisting of rolls having tapers at the end faces of the roll convex parts and flat rolls and gradually force-expanding the groove width of the blank being molded in the transverse direction by the roll convex parts.

CONSTITUTION: A groove is formed in the flat plate rolling work 4 by the roll convex part 6 of a rolling roll 1A. Next, it is rolled by the rolling roll 1B having an end width 15 smaller than the width 16 at the root part of the roll convex part 6 of the rolling roll 1A and further it is rolled by the rolling roll 1C having an end width 15 smaller than the width 16 at the root part of the roll 1B. Here, the widths 16 at the root parts of the rollings 1A, 1B, 1C are set larger as they go toward the later stage sides within the range of not exceeding twice the width 16 at the root part of the previous stage. In this way, the shape section material 14 may be roll-formed by force-expanding the groove of the flat plate rolling work 4 in its width direction without elongating the material in its lengthwise direction.

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