Gauge control technique for top and tail of hot rolled strip steel of Steckel mill

Abstract

The invention discloses a gauge control technique for top and tail of strip steel, and overpressure protection rolls which is located in a high pressure area of top and tail and is protected from being damaged. The gauge control technique comprises steps as follows: during a strip steel rolling process, the end of the strip steel firstly entering the mill is the top, the end later entering the mill is the tail, a high pressure area is set at the top and tail of the strip steel during calendaring, the length of the high pressure area is 0-30 m, and the actual roll gap is S-(S minus 2.5) mm; high rolling reduction of the top is reduced during the last rolling process of the strip steel; during rolling of the tail, when 10-18 m of the tail length remains, the actual roll gap is adjusted gradually to S plus 0.5 mm-S plus 1.5 mm, S represents a target roll gap which refers to a roll gap set between upper and lower work rolls of the mill according to a calculation instruction. The gauge control technique has the advantages that high rolling reduction is performed on the top and tail of the strip steel, so that not only is thickness tolerance of the top and tail of the strip steel reduced and the rolling yield improved, but also roll damage accidents due to strip steel clamp by the rolls are avoided.

Description

technical field [0001] The invention relates to a technology for controlling the thickness of the head and tail of a hot-rolled steel strip in a coil furnace rolling mill. Background technique [0002] The single-stand coil furnace rolling mill is to install the coil furnace with both coiling and heating functions on both sides of the entrance and exit of the finishing mill to realize the reciprocating rolling of the strip. The main function of the coil furnace is to ensure the temperature of the strip steel during the rolling process. During the reciprocating multi-pass rolling process of the strip steel, due to multiple strips, the contact time between the head and tail of the strip steel and the outside is long and the heat loss is large. In addition, due to the direct contact between the head and tail of the strip and the coil drum in the coil furnace, a certain amount of heat loss will also be caused. These heat losses will aggravate the temperature difference between t...

AI Technical Summary

Problems solved by technology

If the thickness of the head and tail exceeds the upper limit of the tolerance, it needs to be cut off, which will affect the actual yield