Plate connecting method for improving flying gauge change rolling stability

Abstract

The invention discloses a plate connecting method for improving flying gauge change rolling stability. The plate connecting method includes the steps: splicing and welding strip steel with changed widths to form a welding seam; digging two side edges of the advanced strip steel along the width direction; and controlling a rolling mill to slow down before edge digging positions enter the rolling mill, and enabling the edge digging positions to enter a roll gap of the rolling mill at the speed lower than 40m / min after rolling. The advanced strip steel is wider than the succeeding strip steel, and the distance between each edge digging position and the welding seam is 1-5m in the advancing direction of the strip steel. By the plate connecting method for improving flying gauge change rolling stability, normal feed of a disk shear can be ensured, the sectional area of the strip steel at the welding seam can be unchanged, accordingly, accidents such as strip breakage are avoided, the stability of the rolling mill in the flying gauge change process is remarkably improved, and the productivity of a unit is greatly improved.

Description

technical field [0001] The invention relates to a metal pickling and rolling method, in particular to a plate passing method in the pickling and rolling process. Background technique [0002] At present, in the field of cold rolling, the combination of pickling and rolling mills is generally used for industrial production, especially the 5-stand continuous rolling mill has gradually become the mainstream of the industry. When this type of unit is in production, a laser welding machine is generally used to weld the leading strip steel and the trailing strip steel, so as to realize continuous production. Due to the large-scale production characteristics of the acid rolling mill, there are many types of rolling products. When the width, thickness and steel type of the strip to be rolled change, the continuous rolling mill will dynamically adjust the parameters such as roll gap, speed and tension to realize the steel type, The change of specifications such as thickness and wid...

AI Technical Summary

Problems solved by technology

However, digging on the welding seam can ensure the normal feeding of the disc shears, but after the welding seam after digging enters the rolling mill, due to the decrease of its cross-sectional area (the width of the weld after digging is smaller than that of the normal female The width of the material), the unit tension on the weld is much higher than other parts of the base metal, so it is very easy to tear the strip from the weld, resulting in broken strip

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