Prevention of buckling in heavy width reduction with longitudinally inclined edging rolls.

概要

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Hearty width reduction has become increasingly important in the production of hot steel strip. When a thick slab is subjected to heavy width reduction, the rolling force is too great. Therefore, the edger must be large and expensive. On the other hand, when a wide slab compared with its thickness is subjected to heavy width reduction, most of slabs buckle convexly upwards along the transverse direction.It was an objective of this study to develop an improved method to reduce heavily the width of thin materials without transverse buckling.As the results, a new edger rolling method with a pair of edging rolls tilted in the entry direction was developed. The principle of operation is as follows; when the edging rolls are tilted in the entry direction, the vertical force is applied upward to the edges of slab. The resultant force of this vertical force and transverse force of edge rolling bends the slab convexly downwards. When heavy reduction is applied to a slab bent in this manner, the slab bending is constrained by the table rollers and buckling does not take place. In the model tests, the critical width reduction without buckling of the new-type edger is three or four times than that of the conventional-type edger.
The Iron and Steel Institute of Japanの論文