An operation method for reducing continuous unwinding and printing

Abstract

The invention relates to an operational method for reducing chrome mark generated by coiling of a continuous annealing line. The operational method comprises the following steps that (1) coiling tension of a coiling machine is set according to coil standard, wherein the coiling is a low speed step-type coiling when in coiling, firstly the head coiling speed is maintained to 50m / min and then is gradually increased to 90m / min, 70m-80m of steel is coiled after 1-1.1minuites, and a loop device begins to work so as to fill a sleeve; and (2), the speed of the coiling head is increased to 150-180m / min after 2-3min in step-by-step, the loop device begins to work so as to take a sleeve, until achieving 10% of a loop quantity, wherein the speed of the coiling machine is automatically reducing technology speed at 80-130m / min. Compared with the prior art, the operational method provided by the invention has the advantages that the tension and coiling speed are adjusted through the application, the reeling mark defect is controlled to be reduced, the good process effect is realized, the energy consumption is saved, the waste quality is reduced, and the large social benefits are generated.

Description

technical field [0001] The invention relates to the technical field of cold-rolled coiling, in particular to an operation method for reducing coiling marks on continuous annealing lines. Background technique [0002] The cold-rolled steel coil is coiled under tension after continuous annealing. Due to the seam contact of the fan-shaped plate interface of the coiler and the long-term wear of the reel, edges and corners appear at the interface of the fan-shaped plate of the reel, which is easy to produce reel marks on the steel plate. Coiling makes reel printing aggravated, and the length of the defect ranges from 30 to 80 meters. Such defects must be removed before delivery, which seriously affects the yield of finished products. Through tracking analysis, it is found that the rapid coiling speed of the head is generally adopted during operation. 100-170m / min, the coiling tension is set to 15600-19500N, and the length of defects in the reel printing produced by this operation...

AI Technical Summary

Problems solved by technology

[0002] The cold-rolled steel coil is coiled under tension after continuous annealing. Due to the seam contact of the fan-shaped plate interface of the coiler and the long-term wear of the reel, edges and corners appear at the interface of the fan-shaped plate of the reel, which is easy to produce reel marks on the steel plate. Coiling makes reel printing aggravated, and the length of the defect ranges from 30 to 80 meters. Such defects must be removed before delivery, which seriously affects the yield of finished products. Through tracking analysis, it is found that the rapid coiling speed of the head is generally adopted during operation. 100-170m / min, the coiling tension is set to 15600-19500N, and the length of defects in the reel printing produced by this operation is 60-80 meters, for example: the width of silicon steel is 1200mm, the thickness is 0.5mm, and the fast coiling speed of the head is 170m / min, the coiling tension is set to 16000N, when rewinding 3973.2m there is a slight hand feeling of the reel printing, 4002m can be seen with the naked eye, and the horizontal double strips are seriously printed, and the coiling is finished at 4052.2m, and the length of the waste cutting is 4052.2-3973.2= 79 meters, the rejection rate of reel printing is 1.95%