Fixed-width trimming device and method for cold-state strip steel

Abstract

The invention relates to the field of strip steel rolling production, in particular to a fixed-width trimming device and method for cold-state strip steel. The fixed-width trimming device for cold-state strip steel comprises two rows of high-pressure spray nozzles, a turning roll, a tensioning unit, a scrap cutter and a control device, wherein the two rows of high-pressure spray nozzles are arranged at the two sides of strip steel respectively in a direction consistent with the moving direction of the strip steel. The fixed-width trimming method for cold-state strip steel comprises the following steps: tensioning strip steel so that the surface of the strip steel is flat and straight and has stable tension; preparing the mixed solution for spray cutting, wherein the high-pressure spray nozzles adopt the mixed solution of industrial pure water and abrasive; and finally controlling the high-pressure spray nozzles to perform trimming by the control device. Based on the high-pressure abrasive jet cutting technology, the device and method provided by the invention realize combination of high-speed cutting and good cutting quality; and smooth-transition tracking cutting is adopted in width specification switch of the strip steel, an S-shaped track is obtained, and the breakage probability of the welded seam area is effectively reduced.

Description

technical field [0001] The invention relates to the field of strip steel rolling production, in particular to a cold-state strip steel fixed-width trimming device and method. Background technique [0002] Fixed-width disc shears (also known as trimming shears) are important equipment used in continuous rolling or semi-continuous rolling production lines. The appearance and size specifications meet the width requirements of the product. For modern rolling production lines, disc shears are usually set at the exit of hot rolling or cold rolling pickling, and the function of the equipment is very critical. [0003] At present, double-head rotary disc shears are mainly used in China. During the shearing process, this type of disc shears often has steel jamming in the chute, which directly affects the shearing quality and normal production of strip steel, and the product quality is difficult to guarantee. The main disadvantages are as follows : [0004] 1) There are many factor...

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Problems solved by technology

[0003] At present, double-head rotary disc shears are mainly used in China. During the shearing process, this type of disc shears often has steel jamming in the chute, which directly affects the shearing quality and normal production of strip steel, and the product quality is difficult to guarantee. The main disadvantages are as follows :

[0004] 1) There are many factors affecting the shearing effect: it is very important and difficult to set the parameters of the disc shears reasonably. Directly affect the strip shearing quality. Improper setting will cause shearing burrs, edge cracks, buckle heads, and steel jamming.

[0005] 2) The operation when switching strip steel specifications is complicated and has great hidden dangers: such as figure 1 As shown, the continuous production line will frequently change from wide to narrow or from narrow to wide, and the connection part is a weld

[0006] 3) It is difficult to accurately control the shear amount: due to the special structural form and shear characteristics of the disc shear, it is difficult to accurately control the width shear amount of the steel plate, especially the thin-gauge steel plate, and the small shear deviation It greatly exceeds the precision control range, which reduces the yield of steel to a certain extent.

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