Cold tandem mill strip steel edge trimming controlling method

Abstract

The invention relates to a cold tandem mill strip steel edge trimming controlling method and belongs to the technical field of cold tandem rolling devices. According to the method, based on existing cold tandem mill lines, a small crescent punched edge with a punched edge depth of 70mm and a large crescent punched edge with a punched edge depth of 120mm are set; when the width difference of strip steel in the front and rear of a welding seam is in a range from 0mm to 75mm, a notcher is controlled to perform a small crescent edge punching at a position of the welding seam, and a circle shear is controlled to perform an edge trimming at the position of the welding seam; when the width difference of strip steel in the front and rear of the welding seam is larger than 75mm and the front and back strip steel is narrow in front and wide in back, the notcher is controlled to perform the small crescent edge punching at a position 1050+ / -30mm in the front of the welding seam, and the circle shear is controlled to perform the edge trimming at a position 1150+ / -30mm in the front of the welding seam; if the front and back strip steel is wide in front and narrow in back, the notcher is controlled to perform the small crescent edge punching at a position 850+ / -30mm in the rear of the welding seam, and the circle shear is controlled to perform the edge trimming at a position 750+ / -30mm in the rear of the welding seam; and otherwise existing processes are performed. According to the method, the small crescent edge punching is innovated, the edge punching position and depth of the notcher and the edge trimming position of the circle shear are respectively judged and adjusted according to the width difference of strip steel in the front and rear of the welding seam, and thereby a sufficient tensile strength of the strip steel at the position of the welding seam can be guaranteed so as to prevent strip breakage.

Description

technical field [0001] The invention relates to a method for controlling edge trimming of a steel strip on a cold tandem rolling mill, belonging to the technical field of cold tandem rolling equipment. Background technique [0002] In the production process of the cold tandem acid rolling unit, the front and rear strips are welded by a welding machine to ensure the continuity of production. In order to ensure the quality of the edges at the exit of the rolling mill, disc shears are installed in the central section of the pickling mill. The disc shears are used to cut the edges of the strip (usually 10-20 mm at the edges of the strip) to eliminate Strip edge defects and target strip width to meet contract requirements. Usually, before the disc shears, a crescent shear device is also installed. The crescent scissors are used to punch out grooves and sharp corners at the welds of the front and rear strip steel, so as to adapt to the cutter heads on both sides of the disc shear...

AI Technical Summary

Problems solved by technology

The above two patents achieve the purpose of reducing the occurrence of strip breakage by controlling the thickness, speed, tension and other control parameters of the strip steel, but the process is complex and costly

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