CN202021201U - Roll contour configuration structure of hot rolling temper mill - Google Patents

Abstract

A roll contour configuration structure for a hot rolling temper mill belongs to the technical field of steel rolling. An edge chamfer roll contour of a biquadrate polynomial curve is utilized on a backup roll, and a six square polynomial positive convexity roll contour is utilized on a work roll. By use of the roll contour configuration, the transverse rigidity of a roll of the temper mill is enhanced, the deflection of the roll is reduced, and the regulation capacity of the bending force of the work roll is improved so as to enable the temper mill to be able to effectively eliminate shortcomings of board shapes, thereby extending the length of a temper rolling plan. Equipment does not need to be reformed, and the purpose of improving board shape quality can be achieved only by grinding special roller curves on the roller.

Description

A kind of hot rolling and leveling machine roll forming configuration structure

Technical field

The invention belongs to technical field of steel rolling, particularly relate to a kind of hot rolling and leveling machine roll forming configuration structure.

Background technology

The major function of hot rolling and leveling machine is to improve the performance of hot-strip, glacing flatness and surface quality etc.The glacing flatness of band steel is the quality index that the user pays close attention to the most, and skin pass rolling can alleviate or eliminate rolling flatness defect, improves the glacing flatness of band steel, thereby improves the quality of band steel.Especially hot rolling thin slab product, the control of milled sheet shape difficult quality after rolling, will be passed through skin pass rolling mostly, improves strip shape quality.For smoothing and rolling process, the strip shape quality that improves the band steel mainly is to rely on rational roll forming system to be guaranteed.Planisher roll forming configuration reasonable in design, the belt plate shape quality is most important for improving.

The shape wave defect type that corresponding course of hot rolling band steel produces, unrestrained flatness defect need reduce the positive bending roller force of planisher or add to load with roller and improve in the band steel, and the bilateral unrestrained defective of band steel need increase positive roller and improves.Conventional hot rolling and leveling machine backing roll and working roll all are plain-barreled roll configurations basically, cause outside exceeding strip edge portion scope, there are harmful contact zone between roller in working roll and backing roll, make the working roller bending distortion increase, the roll gap lateral stiffness reduces, limit the normal performance of planisher work roll bending effect simultaneously, finally made skin pass rolling plate shape be difficult to control.Especially behind the belt steel rolling, when having the flatness defect of bilateral wave, the ability of regulation and control of positive roller is received restriction, and it is lower that the strip shape quality of band steel improves degree.

Summary of the invention

The purpose of this utility model is to provide a kind of hot rolling and leveling machine roll forming configuration structure, mainly the problem of Xie Jueing is: dispose by roll forming, the roller that increases planisher is a lateral stiffness, reduce the bent deflection of disturbing of backing roll, improve the ability of regulation and control of work roll bending power, make smooth function effectively eliminate flatness defect, prolonged the length of skin pass rolling plan, reach the purpose of improving strip shape quality.

The utility model adopts as shown in Figure 1 working roll and backing roll roll forming configuring technical on four roller planishers, promptly backing roll adopts the limit portion chamfering roll forming of 4 power polynomial curves, adopts the positive convexity roll forming of 6 power multinomials on working roll.

Planisher backing roll barrel length is 2200mm, and the backing roll roll forming adopts the limit portion chamfering roll forming of 4 power polynomial curves, and as shown in Figure 2, the roll shape curve equation is:

$R\left(x\right)=\left\{\begin{array}{cc}0& -500\&le;x\&le;500\\ b_4{x}^4+b_3{x}^3+b_2{x}^2+b_{1}x+b_0& -1100\&le;x<-500\\ b_4{x}^4-b_3{x}^3+b_2{x}^2-b_{1}x+b_0& 500<x\&le;1100\end{array}\right.$

Wherein, R (x) is a backing roll body of roll semidiameter, and unit is mm; X is a body of roll axial coordinate, and the origin of coordinates is in body of roll centre position, and unit is mm; Polynomial equation coefficient b ₄=-7.7160494E-12; b ₃=-1.5432099E-08; b ₂=-1.1574074E-05; b ₁=-3.8580247E-03; b ₀=-4.8225309E-01.

Planisher working roll barrel length is 2700mm, adopts the positive convexity roll forming of 6 power multinomials on working roll, and the roll shape curve equation is:

W(x)＝a ₆x ⁶+a ₅x ⁵+a ₄x ⁴-a ₃x ³+a ₂x ²-a ₁x+a ₀

Wherein, W (x) is a working roll body of roll semidiameter, and unit is mm; X is a body of roll axial coordinate, and the origin of coordinates is in body of roll centre position, and unit is mm; Polynomial equation coefficient a ₆=-2.4779278E-21; a ₅=4.1341242E-28; a ₄=-4.2149552E-15; a ₃=-4.7466467E-21; a ₂=-5.4869684E-10; a ₁=-5.3854626E-15; a ₀=-1.5695056E-11.

The computational analysis of adopting Finite Element Method to adopt the roll gap modification scope of plain-barreled roll and this utility model roll forming configuring technical scheme to carry out to planisher.When planisher backing roll and working roll all adopt plain-barreled roll, as shown in Figure 4, it is bigger that roll is disturbed bent distortion, and roller system distortion convexity is between 50 to 200um, different with the roller parameter and different according to different roll shiftings, but the very difficult size of adjusting the roll gap convexity by bending roller force.When backing roll adopt to adopt limit portion chamfering roll forming, the working roll of 4 power polynomial curves to adopt the positive convexity roll forming of 6 power multinomials, it is very big that roll is disturbed bent distortion reduction amplitude, as shown in Figure 5.In the time of positive roller, the distortion of roller system is negative convexity form, and the convexity scope is between 20 to 150um.When bearing roller, convexity remains in the 150um.This shows that this roll forming configuration convexity adjustable range is bigger, and the ability of regulation and control of roller strengthens.

Effect of the present utility model is: the limit portion chamfering roll forming that adopts 4 power polynomial curves on backing roll, on working roll, adopt the positive convexity roll forming of 6 power multinomials, by above-mentioned roll forming configuration, the roller that increases planisher is a lateral stiffness, reduce the bent deflection of disturbing of backing roll, improve the ability of regulation and control of work roll bending power, make smooth function effectively eliminate flatness defect, prolonged the length of skin pass rolling plan.Need not equipment is transformed, just the special roll shape curve of grinding just can reach the purpose of improving strip shape quality on roll.Simultaneously, this utility model also can connect on the four roller planishers move back with zinc-plated unit back to rolling mill production line and applies.

Description of drawings

Fig. 1 is four roller hot rolling and leveling machine roll forming allocation plans.Wherein, support roller 1, top working roll 2, band steel 3.

Fig. 2 is hot rolling and leveling machine backing roll roll shape curve figure.

Fig. 3 is a hot rolling and leveling machine shape of working roll curve map.

Roll gap modification scope figure when Fig. 4 is planisher backing roll and working roll employing plain-barreled roll shape.

Roll gap modification scope figure when Fig. 5 adopts the configuration of the utility model roll forming for planisher.

Fig. 6 is planisher working roller abrasion roll shape curve figure when adopting plain-barreled roll.

Fig. 7 is smooth front and back band steel convex measuring figure as a result when adopting plain-barreled roll.

Fig. 8 is for adopting the wearing and tearing roll forming curve map after the utility model roll forming disposes.

Fig. 9 is for adopting the smooth front and back band steel convex measuring in the utility model roll forming configuration back figure as a result.

The specific embodiment

Fig. 1～Fig. 9 is a kind of specific embodiment of the present utility model.

The utility model adopts the limit portion chamfering roll forming of 4 power polynomial curves on backing roll, adopt the positive convexity roll forming of 6 power multinomials on working roll.

Behind hot rolling line, arrange the smooth unit of cover four rollers, be used for steel grade requirements such as thin specification belt plate shape improvement of hot rolling and acid-cleaning plate are eliminated the skin pass rolling work of treatment of yield point elongation.Smooth unit equipment major parameter: the backing roll diameter is 1000～1100mm; The backing roll barrel length is 2200mm; Work roll diameter is 500～550mm; Working roll barrel length 2700mm; The roll shifting limit is 400mm; Maximum rolling force is 1500t; Percentage elongation≤4%; Work roll bending is ± 60t; The strip width scope is 750～2130mm; Belt steel thickness scope 1.2～6.8mm that can be smooth; The maximum 30t of forward pull; The maximum 18t of backward pull.

Shoudu Iron and Steel Co moves the thin specification container plate of steel production (when thickness≤2.0mm), hot rolling acid-cleaning plate, high-grade automobile exterior panel and thin size high-tensile steel, at course of hot rolling, belt plate shape is difficult to control to customer requirements, especially the thick specification of container plate 1.6mm, must carry out the smooth belt plate shape that improves, and then give user's shipping.In the coil of strip of smooth back delivery, still exist a certain proportion of band steel to have the flatness defect of limit wave.Planisher has been carried out the process data tracking, calculated by analysis, planisher backing roll and working roll are plain-barreled roll, and not having roll forming is one of restraining factors.During plain-barreled roll shape, roll wear is serious, and especially in the strip edge portion zone of skin pass rolling, the irregular wear of roll is serious, as shown in Figure 6, and the differing greatly of both sides, positive roller regulation and control limit wave plate shape ability is received restriction.When adopting plain-barreled roll shape, section before and after the belt steel flating has been carried out tracking measurement, the result as shown in Figure 7, the band steel has just been finished formation process under equal proportion convexity situation, the extension difference to section does not provide correct adjustment, it is less to cause skin pass rolling to improve the amplitude of shape wave, can not eliminate the shape wave defective.In order to strengthen planisher plate shape control ability, planisher working roll and backing roll roll forming have been carried out technological improvement, and adopt this utility model roll forming configuration: backing roll adopts limit portion chamfering roll forming, the working roll of 4 power polynomial curves to adopt the positive convexity roll forming of 6 power multinomials.After adopting new roll forming configuration, planisher plate shape ability of regulation and control is strengthened, and after the skin pass rolling plan was finished, following machine wearing and tearing roll forming was improved, and on wear extent and uniformity obvious embodiment is arranged all, as shown in Figure 8.Band steel section convexity to smooth front and back has been carried out the detailed tracking measurement, and the result according to raw material plate shape situation, rationally sets bending roller force as shown in Figure 9, and strip profile changes expanded range, has also increased belt plate shape quality improvement amplitude.

This utility model roll forming configuring technical moves on the steel hot rolling and leveling machine at Shoudu Iron and Steel Co and to use, and has satisfied the thin specification belt plate shape quality of smooth improvement, effectively reduces user's flatness defect quality objection quantity, has promoted the quality reputation of product.Simultaneously, also improved productivity ratio, skin pass rolling amount of plan rising to more than the 2000t time by plain-barreled roll less than 1000t.

Claims (3)

1. a hot rolling and leveling machine roll forming configuration structure is characterized in that: adopt the limit portion chamfering roll forming of 4 power polynomial curves on backing roll, adopt the positive convexity roll forming of 6 power multinomials on working roll.

2. roll forming configuration structure according to claim 1 is characterized in that: when planisher backing roll barrel length was 2200mm, the backing roll roll forming adopted the limit portion chamfering roll forming of 4 power polynomial curves, and the roll shape curve equation is:

$R\left(x\right)=\left\{\begin{array}{cc}0& -500\&le;x\&le;500\\ b_4{x}^4+b_3{x}^3+b_2{x}^2+b_{1}x+b_0& -1100\&le;x<-500\\ b_4{x}^4-b_3{x}^3+b_2{x}^2-b_{1}x+b_0& 500<x\&le;1100\end{array}\right.$

Wherein, R (x) is a backing roll body of roll semidiameter, and unit is mm; X is a body of roll axial coordinate, and the origin of coordinates is in body of roll centre position, and unit is mm; Polynomial equation coefficient b ₄=-7.7160494E-12; b ₃=-1.5432099E-08; b ₂=-1.1574074E-05; b ₁=-3.8580247E-03; b ₀=-4.8225309E-01.

3. roll forming configuration structure according to claim 1 is characterized in that: when planisher working roll barrel length is 2700mm, adopt the positive convexity roll forming of 6 power multinomials on working roll, the roll shape curve equation is:

W(x)＝a ₆x ⁶+a ₅x ⁵+a ₄x ⁴-a ₃x ³+a ₂x ²-a ₁x+a ₀

Wherein, W (x) is a working roll body of roll semidiameter, and unit is mm; X is a body of roll axial coordinate, and the origin of coordinates is in body of roll centre position, and unit is mm; Polynomial equation coefficient a ₆=-2.4779278E-21; a ₅=4.1341242E-28; a ₄=-4.2149552E-15; a ₃=-4.7466467E-21; a ₂=-5.4869684E-10; a ₁=-5.3854626E-15; a ₀=-1.5695056E-11.

Images