Manufacturing apparatus and manufacturing method of hot-rolled steel sheet

摘要

Provided is a manufacturing apparatus and manufacturing method of hot-rolled steel sheet which enables uniform cooling of a rolled material and improvement of the surface properties thereof. The manufacturing apparatus comprises: a rolling stand; a supplying device capable of supplying lubricant to work rolls and/or backup rolls; an online roll grinding device; and a removing device capable of removing at least part of the lubricant before the surface of the work rolls is ground by the grinding device. The manufacturing method comprises the steps of: removing at least part of the lubricant adhered to the work rolls, or to the work rolls and backup rolls using the lubricant removing device after completing rolling of a preceding material; grinding the work rolls using the online roll grinding device after the removing step; and supplying the lubricant to the work rolls and/or backup rolls from the lubricant supplying device.

主权项

1. A manufacturing apparatus of a hot-rolled steel sheet comprising:
a rolling stand provided with work rolls and backup rolls; a lubricant supplying device that supplies a lubricant to the work rolls and/or the backup rolls; an online roll grinding device that grinds a surface of the work rolls; and a lubricant removing device that is configured to remove at least a part of the lubricant adhered to the work rolls, or to the work rolls and the backup rolls, before the surface of the work rolls is ground by the online roll grinding device; and a water-cooling device that cools the work rolls with water; wherein the lubricant removing device sprays cooling water having a temperature of 50° C. or more, wherein the online roll grinding device is disposed on an upstream side of the work rolls in the traveling direction of a material to be rolled by the rolling stand, and the lubricant removing device is disposed on a downstream side of the work rolls in the traveling direction of the material to be rolled by the rolling stand.