CN1013250B - Rolling mill with small deflection and high rigidity of roller - Google Patents

Abstract

The invention belongs to a multi-roller mill for producing plate strips. The outer layer support roll of the tower-shaped roll system of the rolling mill is supported on the roll seats in a multi-point beam mode, at least one of the upper roll seat and the lower roll seat is movable, and the position of the pressing device is located near the middle of the axial line of the working roll on the roll seats, so that the bending deformation of the stand is converted into quasi-rigid displacement of the roll seats and the working roll. Therefore, the bending deformation of the working roll basically does not fluctuate along with the fluctuation of the rolling force, thereby ensuring the shape of the generatrix of the working roll and effectively reducing the transverse thickness difference of the plate and strip. The rolling mill is especially suitable for the production of wide plate and strip, and can also be used for the production of section bars and wire rods.

Description

Mill with small-deflection and high-rigidity rolls

The present invention is a kind of novel roll small deflection, stiff mill, can be used among the production of strip material.

Normally used milling train has the milling train of two rollers, four rollers and multiple roll etc.For two rollers, four-high mill, when rolled piece passes through support, because screwdown gear is positioned at the roll neck place of roll, must make roll produce bigger flexural deformation, therefore, duo mill has to increase roller diameter, and four-high mill has to increase the diameter of backing roll, reducing flexural deformation, and the flexural deformation of roll changes along with the variation of roll-force.

Cluster mill has whole memorial archway type and open-type, and the rigidity of whole memorial archway type multi-roll mill (showing as Fig. 1) is very big, but because the restriction of physical dimension relation.It is little to depress adjusting range, has limited the scope of application of this kind milling train, generally is used for rolling very thin strip material.Open-type multi-roll mill (showing as Fig. 2) is compared with whole memorial archway type.Its adjusting range of depressing is bigger, and flexibly, but the rigidity of milling train is less.

The Japan Patent spy opens clear 54-1259(and sees Fig. 3) a kind of multi-roll mill that combines whole memorial archway type and open-type milling train advantage is disclosed, this machine adopts tower rollers system, the back lining bearing multi-point support, the rigidity of milling train is bigger, and the inlet of milling train is smooth and easy.

The contacted part of the frame of these several multi-roll mills and backing roll, under the effect of roll-force, still produce flexural deformation, backing roll system and even working roll also produce flexural deformation thereupon, thereby make the strip material produce lateral thickness difference, i.e. bending of work roll distortion still changes with the variation of roll-force.

The distortion of milling train can only reduce, and can not eliminate fully, therefore must take measures to control this distortion, reduces its influence to strip thickness.The automatic control problem of strip longitudinal thickness be we can say so far substantially and is solved, study the control technology of lateral thickness difference in recent years emphatically, lateral thickness difference depends on the size and shape of roll work roll gap, and the one of the main reasons that influences the work roll gap is the flexural deformation of roll.Under the effect of draught pressure, roll can produce flexural deformation, and this has just changed the shape of work roll gap.Therefore, people have to serve as according to designing original roller type with metastable rolling load, in order to the flexural deformation of the compensating for roll influence to the work roll gap.In the operation of rolling, the factor of influence of rolled power has many, deviation as sotck thinkness, width, the mechanical performance of rolled piece is inhomogeneous, and rolling condition changes (change of mill speed, temperature, friction condition, front and back tension force or the like), all can cause the fluctuation of roll-force, also fluctuate along with the fluctuation of roll-force with regard to the flexural deformation that causes roll, therefore, original roller type can not adapt to this fluctuation, thereby makes the strip material produce lateral thickness difference.The method of having taked various roll shapes to adjust in the actual production, but, also be difficult to realize control automatically at present because the template detection technique does not reach a standard as yet.

Purpose of the present invention, exactly for the flexural deformation that solves roll influence to the strip lateral thickness difference, the shape that is breaker roll work roll gap is controlled, make the working roller bending distortion not be subjected to the influence of roll-force fluctuation, obtain a kind of roll small deflection, high rigidity and depress the big multi-roll mill of adjusting range, thereby make multi-roll mill not only be used for cold-rolled plate and strip, and can be used for the production of wide cut deal.

For achieving the above object, the present invention is supported on the outer backing roll of the tower rollers system form with the multiple spot beam on the roller base, acts on draught pressure on the working roll through the transmission of roller system, is born by roller base dispersedly; Two roller bases have at least one to be movable block up and down, and the change of roll gap is by the realization that relatively moves of two roller bases up and down between the working roll; The draught pressure that the movable roll seat bears is delivered in whole or up and down on two the frame through screwdown gear or cushion block, the position of screwdown gear or cushion block is positioned near the middle part of working roll axis, and the quantity of screwdown gear is at least two, thereby makes the flexural deformation of frame convert the accurate rigid displacement of roller base and even working roll to.

Below in conjunction with accompanying drawing the present invention is described in further detail.

Fig. 1 is whole memorial archway type multi-roll mill schematic diagram.

Fig. 2 is an open-type multi-roll mill schematic diagram.

Fig. 3 opens the disclosed multi-roll mill schematic diagram of clear 54-1259 for the Japan Patent spy.

Fig. 4,5 is multi-roll mill schematic diagram of the present invention.

Sequence number is represented among the figure: rolled piece 1, and working roll 2,2 ', tower rollers system (backing roll) 3,3 ', frame 4, upper stand 5, lower framework 6, column 7, roller base 8, screwdown gear 9, frame 10, topping roll seat 11, lower roller base 11 ', holding-down device of hydraulic 12, cushion block 13, frame 14.

Among Fig. 4,5, roll small deflection provided by the invention, high rigidity multi-roll mill, by working roll 2 and 2 ', backing roll is 3 and 3 ' form, top roll system is supported by topping roll seat 11, lower roll system is by lower roller base 11 ' support, the top and bottom rolls seat all can move up and down in the window of frame 14, backing roll is 3 and 3 ' outer backing roll be form with the multiple spot beam be supported on roller base 11,11 ' on, lower roller base 11 ' support by cushion block 13, realize the adjustment of roll line by the cushion block that adds different size, also can adopt hydraulic means; The top of topping roll seat 11 is provided with screwdown gear 12, can adopt the holding-down device of hydraulic or the housing screw of hydraulic cylinder action, and topping roll seat 11 is moved up and down in the window of whole frame 14, thereby realizes the adjustment of roll gap.

Compared with prior art, the resulting milling train of the present invention has the following advantages:

This rolling mill screw down is positioned near the middle part of axis of operation, so bending of work roll distortion do not fluctuate with the fluctuation of roll-force basically, thereby has guaranteed the shape of working roll bus, and the lateral thickness difference of strip material is reduced greatly.

The multi-roll mill that adopts the present invention to obtain can make the design of original roller type obtain simplifying, and the control of rolling middle roll shape is also greatly simplified.This milling train is owing to the bending of work roll distortion is not fluctuateed with the fluctuation of roll-force basically, all influence factors in the original roller type design such as flexural deformation, flattening deformation, thermal expansion and wearing and tearing of roll or the like, just can not consider this most important factor of flexural deformation, and thermal expansion and wearing and tearing are to change factor slowly, and roll shape control is greatly simplified.

Because the volume of this milling train is little, in light weight, cost is low, thus, can reduce the Workshop Production area, reduce factory building height, reduce the span and the tonnage of overhead traveling crane, reduce the tonnage of grinding machine and other auxiliary equipment, thereby reduce investment.

Below in conjunction with Fig. 5 embodiments of the invention are narrated.This embodiment is the multi-roll mill that applies the present invention to 6 rollers configurations, up-down rollers system be respectively by working roll 2 and 2 ', backing roll 3 and 3 ' institute constitutes, top roll system is by 11 supports of topping roll seat, lower roll is by lower roller base 11 ' support; The top and bottom rolls seat all can move up and down in the window of whole frame 14.Lower roller base is supported by cushion block 13, and this cushion block is positioned near the middle part of working roll axis, realizes the adjustment of roll line by the cushion block that adds different size; Be provided with holding-down device of hydraulic 12 on the top of topping roll seat, this holding-down device of hydraulic is positioned near the middle part of working roll axis, by the hydraulic cylinder control action, topping roll seat 11 is moved up and down in the window of whole frame 14, to realize the adjustment of roll gap.

Present embodiment is the action of pressured lower device 12, roller base 11 is moved up and down in the window of frame 14, to realize the adjustment of roll gap, screwdown gear 12 can be equipped high-precision thickness of slab automaton, correctly to detect the size of draught pressure and roll gap, automatically control, produce high-precision product.

The backing roll 3 and 3 of present embodiment ' roll crown guiding mechanism (omitting among the figure) also can be set also can use back lining bearing to support.

Present embodiment also can be provided with the bascule (omitting among the figure) of roll axial adjusting device and top roll system and topping roll seat.

Present embodiment also can further increase high efficiency roll cooling device, promptly can be applicable to the production of hot rolled strip material.

The present invention is not only limited to the milling train of the six rollers configuration of the foregoing description, and is suitable too to the milling train of other multiple roll configuration.

In addition, frame of the present invention is not limited to whole machine frame rolling mill, is suitable for too for the open-type frame.

Claims (1)

1, a kind of roll small deflection, stiff mill be by working roll 2 and 2 ', backing roll is 3 and 3 ' composition, top roll system is supported by topping roll seat 11, lower roll system is by lower roller base 11 ' support, backing roll is 3 and 3 ' outer backing roll be that form with the multiple spot beam is supported on roller base 11,11 ' on, lower roller base 11 ' be supported on the cushion block 13, the top of topping roll seat 11 is provided with screwdown gear 12, the top and bottom rolls seat can be respectively by screwdown gear 12, cushion block 13 is regulated and is moved up and down, this milling train also comprises frame 14, it is characterized in that: cushion block 13 and screwdown gear 12 all are positioned near the middle part of roller base top working roll axis, and the quantity of screwdown gear is at least two.

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