Multiple rolling machine and its control method

Abstract

Provided is a multi-roll mill R, a working roller 11a, 11b of which has a first mid-roller 12a, 12b, wherein a relatively slow wiry taper is formed at one end of the mid-roller for control the shape, and at another end, a relatively steep wire taper for edge-dropping is formed. The tapers of the first mid-roller 12a and the first mid-roller 12b are different form each other which are respectively arranged at upside and underside, then the first mid-roller 12a and the first mid-roller 12b can move in the axial direction. Further more, before starting rolling, the first mid-rollers 12a, 12b are moved for ensuring that the taper for edge-dropping control can reach the position of the plank end of a rolling material during the edge-dropping control being implemented. Also before starting rolling, the first mid-rollers 12a, 12b are moved for ensuring that the taper for shape control can reach the position of the plank end during the shape control being implemented.

Description

technical field [0001] The present invention relates to a multi-roll rolling mill and its control method, in particular to a rolling mill capable of controlling the plate shape and plate thickness distribution of a rolled material and its control method. Background technique [0002] Cold-rolled silicon steel sheets have been widely used in electrical steel sheets. However, in recent years, a multi-roll mill called a Sendzimir mill or the like has been frequently used for cold-rolling at this time. [0003] However, in cold rolling using such a rolling mill, so-called edge drop occurs. Here, the edge drop refers to a steeply reduced plate thickness region that appears at the end in the plate width direction of the rolled thin plate. [0004] In addition, in the case of this electrical steel sheet, it is mostly used as a laminated body. In this case, if the plate thickness in the width direction of the sheet is not uniform due to edge drop, it is difficult to maintain the sh...

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Problems solved by technology

[0019] In addition, since the shifting function of the first intermediate roll in the prior art is only used for edge drop control, even if the shifting function of the first intermediate roll is adopted, since the same intermediate roll as the edge drop control is used, , so it is also difficult to control the shape

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