Cold-rolled steel strip rolling method

Abstract

The invention relates to a cold-rolled steel strip rolling method. A straightening strip head of a straightening machine is arranged in the front of an original rolling-mill housing, a CPC alignment device is arranged on an uncoiler and enables strip materials to enter the rolling-mill housing in an aligned mode for rolling, a main rolling mill is a six-roller rolling mill, an upper middle roller and a lower middle roller of the main rolling mill have an axial horizontal moving function, an upper work roller and a lower work roller have positive and negative roller bending functions, the main rolling mill is additionally provided with an AGC hydraulic screw down control system, and the front portion and the rear portion of the main rolling mill are respectively provided with an X-ray thickness gauge, a vacuum oil removing device, an upper row of air knives and a lower row of air knives. Steel strip pickling undergoes uncoiling preparation, threading rolling, reversible rolling, finished product rolling and coil unloading for rolling of steel strips, the technical problems that work rollers need an original convexity degree, the diameters of the work rollers are difficult to reduce, roller rolling and bending can not be effectively achieved, storage amount of spare work rollers and roller consumption is increased are solved, and the thickness control precision and plate face cleanness are improved.

Description

[0001] technical field [0002] The invention belongs to the technical field of metal material processing, and in particular relates to a rolling method of a cold-rolled steel strip. Background technique [0003] With the rapid development of modern industry, construction, and household appliances, higher requirements are placed on the product quality of cold-rolled steel strips, especially for the surface quality, thickness accuracy, and shape accuracy of cold-rolled steel strips. , such as high-end home appliance panels and automotive panels require smooth surfaces, flat shapes, and high thickness precision. [0004] For decades, the traditional four-high cold rolling mill has been the primary technology in the field of cold strip rolling, but the biggest disadvantage of the four-high cold rolling mill is that in the contact area between the work roll and the back-up roll that is larger than the width of the rolled strip, Regardless of the diameter of the backup roll, the...

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Problems solved by technology

[0004] For decades, the traditional four-high cold rolling mill has been the primary technology in the field of cold strip rolling, but the biggest disadvantage of the four-high cold rolling mill is that in the contact area between the work roll and the back-up roll that is larger than the width of the rolled strip, Regardless of the diameter of the backup roll, the rolling load will increase the deflection of the work roll, so for the shape of the cold-rolled sheet, this is a harmful contact zone, which will cause problems such as the original crown of the work roll, the work roll The roll diameter is difficult to reduce, the roll bending cannot be effectively used, the inventory of spare work rolls increases, and the edge of the product is thinned, etc.

In addition, online feedback compensation and adjustment cannot be well realized. The cold-rolled steel strip produced has low dimensional accuracy, poor shape, and unclean surface, which cannot meet the quality requirements of high value-added products.

[0005] In recent years, some iron and steel enterprises in my country have introduced foreign cold tandem rolling units, which have the characteristics of high operating speed, but there are the following problems: (1) complex equipment and large area; (2) inflexible production and poor adaptability to varieties and specifications ; (3) Unable to roll extremely thin cold-rolled steel strip; (4) Large equipment investment and high maintenance costs; (5) The process is not easy to adjust, and the production operation is difficult to master

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