Hot rolling straightener supporting roller system roller surface curve optimization method

Abstract

The invention discloses a hot rolling straightener supporting roller system roller surface curve optimization method. The hot rolling straightener supporting roller system roller surface curve optimization method comprises steps that (1) based on actual roller surface curves of supporting roller individuals, the roller surface curves of the supporting roller individuals are ground to infinitely approach T1(x1): T1(x1)=Q1 / E1a1X1(x1); X1(x1)=1 / [pi]ln[1 / {1-(x1 / a1)<2>}], the absolute value of x1 is smaller than a1; X1(x1)=1 / [pi](1.1932+lna1 / b1), and the absolute value of x1 is equal to a1; (2) the several supporting roller individuals are made to be coaxial; (3) the roller surface curves of the supporting roller sets are ground to infinitely approach T2(x2): T2(x2)=Q2 / E2a2X2(x2); X2(x2)=1 / [pi]ln[1 / {1-(x2 / a2)<2>}], the absolute value of x2 is smaller than a2; X2(x2)=1 / [pi](1.1932+lna2 / b2), and the absolute value of x2 is equal to a2; (4) the several supporting roller sets are made to be coaxial; (5) the roller surface curve of a supporting roller system is ground to infinitely approach T3(x3): T3(x3)=Q3 / E3a3X3(x3); X3(x3)=1 / [pi]ln[1 / {1-(x3 / a3)<2>}], the absolute value of x3 is smaller than a3; X3(x3)=1 / [pi](1.1932+lna3 / b3), and the absolute value of x3 is equal to a3.

Description

technical field [0001] The invention relates to a roll surface curve optimization method, in particular to a roll surface curve optimization method of a supporting roll system. Background technique [0002] Defects generated during the rolling, heat treatment, cooling and transportation of steel plates are usually corrected by straightening machines. Straightening has become an essential process in the rolling process of cold rolling, hot rolling, and wide and thick plates. In addition to correcting the shape and position defects of the rolled piece, the leveler also has the functions of breaking scale, anti-wrinkle and improving the mechanical properties of the rolled piece. As users have higher and higher requirements for the quality of rolled products, especially for cold-rolled and hot-rolled sheets, the requirements for the mechanical properties, processing accuracy, maintenance costs and service life of the straightening machine are also getting higher and higher. ...

AI Technical Summary

Problems solved by technology

At present, the strength or thickness of some steel types has exceeded the original design capacity of the equipment. For example, the current 2050mm hot rolling and finishing HM06 thick plate line unit, the production design strip tensile strength σb≤650Mpa, strip yield strength σs≤500Mpa, so the equipment The limit capability is constantly being challenged, leading to a sharp increase in the failure rate of equipment. In addition, users have higher and higher requirements for product shape, surface quality, and dimensional accuracy, which brings great difficulties to production.

[0004] At present, the outer ring of the back-up roll used in China and provided by a foreign back-up roll supplier is bearing steel 100CrMo7, and the back-up roll shaft is made of carburized steel 18NiCr Mo5, but its use on the strong leveler is not ideal, and there are fractures and grease leakage. , breakage, cracks and fatigue

After analysis, the contour state of the bus bar on the back-up roll of the strong straightening machine is poor, and the contour height is only controlled according to the foreign standard of 0.3mm, which cannot effectively ensure the stable production of the hot continuous rolling high-strength and ultra-high-strength steel finishing production line above 1000MPa

In order to achieve stable production of hot continuous rolling high-strength and ultra-high-strength steel finishing lines above 1000MPa, it is necessary to increase the bearing capacity of the support roll system of the leveler. Difficulties that urgently need to be solved

In addition, in the current support roll system, the coaxial accuracy of the support roll group is usually only 0.3mm, which will greatly affect the product quality

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