Control method for eliminating flat coiling of hot-rolled thin-gauge checkered plate

Abstract

The invention discloses a control method for eliminating flat coiling of a hot-rolled thin-gauge checkered plate. The control method includes the following steps that 1, strip steel unit tension is controlled, and unit coiling tension is controlled to range from 28 N / mm<2> to 40 N / mm<2>; 2, tension distribution is controlled, and the strip steel tension distributed value is controlled to range from 50% to 75%; 3, pinch roller pressure is controlled, and the pinch roller pressure values are increased by 0-20 KN based on the numerical value of a pinch roller pressure control model; 4, wrapper roller gaps are controlled, and the wrapper roller gap adjusted values HRG range from 5.5 mm to 8.5 mm. The control method is easy and convenient to carry out, feasible, easy to operate, low in cost, capable of basically solving the flat coiling problem of the hot-rolled thin-gauge checkered plate and capable of being widely applied to the technical field of thin strip steel coiling.

Description

technical field [0001] The invention relates to a thin-strip coiling control process, in particular to a control method for eliminating flat coiling of hot-rolled thin pattern plate. Background technique [0002] The strip steel with pattern on the surface is called pattern plate, and its pattern is a mixed shape of lenticular, rhombus, round bean and oblate. Some domestic steel mills mainly produce lentil-shaped checkered plates, see figure 1 , its main production process: desulfurization → converter → argon blowing → LF → continuous casting → soaking furnace → finishing rolling → layer cooling → coiling → leveling. [0003] In the production of pattern plates in domestic steel mills, strip steel with a thickness less than 2.0mm is generally called thin material. The main thickness specification of pattern plates is: 1.4-2.0mm. It is found during production that the steel coils tend to appear flat after coiling The coil phenomenon, and the thinner the strip steel is, the ...

AI Technical Summary

Problems solved by technology

[0006] After researching the checkered plate strip steel, it was found that there are two problems: Problem 1: There is a bean height on the surface of the checkered plate, and after the strip steel is coiled into a coil, the bean height causes a gap between the strip layers, and the produced steel coil Placed horizontally, steel coils are prone to flat coils under their own gravity; problem 2: According to empirical values, the unit coiling tension of strip steel is generally 5% to 15% of the thermal yield. The unit coiling tension should not be too large, otherwise the strip width between the rolling mill F7 and the coiler pinch roll will be narrowed

Question 3: Reducing the coiling temperature means that the strength of the strip steel increases, but the strength cannot be increased blindly, otherwise the checkered plate will be too hard to use

[0007] Therefore, in the coiling process of hot-rolled thin gauge plate, increasing the unit coiling tension of the strip and lowering the coiling temperature cannot fundamentally solve the problem of flat coiling of the checkered plate

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