JPS59133904A - Parallel rolling method - Google Patents

Abstract

PURPOSE:To provide prescribed shape corrections to both rolling materials by separating strips from each other to the upper and lower sides of a mill and passing one strip between two rolls located at the upper side and the other one between two rolls located at the lower side, at the same time, and rolling each strip by one side half of the length of each roll surface. CONSTITUTION:Strips 12, 13 obtained by dividing a wide strip are separated from each other to the upper and lower sides of a rolling mill, and the strip 12 is passed between an intermediate roll 23 and a work roll 25 located at the upper side and the strip 13 is simultaneously passed between a work roll 26 and an intermediate roll 24 located at the lower side, to roll each strip by using one side half of the length of each roll surface. At this time, an operating side and a driving side of an intermediate roll bender Pi and a work roll bender Pw are controlled separately, to control the pressure distribution A-B of the strip 12 as shown by (a)-(b) in the figure, and the edge forms of the strips 12, 13 are controlled in a wide range by moving for adjustment the rolls 23, 24 in their axial directions. Further, the strips of the upper and lower sides are replaced with each other to cope with the wear of rolls. In this way, the shape of strip is independently corrected to form the excellent edge drops at the ends of strip respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention particularly relates to a parallel rolling method that improves the efficiency of roll usage and improves the shape of a Mechanical steel.

[Prior art]

For example, in the manufacturing process for copper strips, a continuous slab caster is used to form a cable slab from bath steel, the thickness of this is reduced to 2 to 6 rran using a hot strip mill, and after pickling treatment, the thickness is reduced to 0.1 rran using a cold mill. The product is manufactured by going through various processes such as zinc plating, tin plating, etc.

The width of the steel strip handled by this series of equipment is usually 60 mm.
0 to 2000+r+n, and the equipment has the ability to process steel strips with widths in this range. However, in reality, the width of the ML band is adjusted to the demand situation from the material stage, so the 900+ran, which is in high demand, is
The ratio of handling the full width of front and rear plates is increasing. For this reason, a series of conventional equipment of this type has a problem in that the n-th blade of the equipment is not fully utilized. Furthermore, when handling narrow width equipment with wide equipment, only the portions through which the material passes will wear out without forming bubbles in the guide rolls and rolling rolls of the series of equipment. Therefore, even if only a portion of the roll is worn out, it becomes necessary to replace the entire set, which has the disadvantage that the original cost of the roll and maintenance cost are several times higher than when producing a wide roll.

In order to improve these conventional drawbacks and reduce productivity as well as maintenance and management costs, it is necessary to constantly handle wide materials that can always exert the maximum steering force of the equipment. Therefore, we adopted a method in which the dimensions of the product were adjusted to suit the requirements of the final product by dividing it in the process before it becomes the final product, that is, in the post-process of the cold strip mill, for the lifting platform of the galvanized copper strip. , can handle wide materials at all times.

By the way, as shown in FIG. 1(2), the width end of the rolled strip 1 has a tapered bevel called an edge drop 2. A strip like this,
For example, when the material is divided by a continuous dividing device such as a slitter, the ends of the divided portion form a right-angled analysis surface as shown in FIG. 1(B). For the dividing strip 3 having such a square cross section, plating 4 of zinc, tin, etc. is applied to the surface treatment.
If this is applied, the shape of each part of the divided strip 3 overlaps with the points that are easily cooled, resulting in poor flow of the plating solution.
This part is called edge overcoat 5 and is in a filtration plated state. If such an over-soaking condition occurs, the plating solution will be wasted, the overplated portion of the edge overcoat 5 will swell, and the product quality will deteriorate when the strip is wound. The problem of doing so was also rare.

How to solve this problem with wide steel strip? After dividing, edge drops may be formed in the square cross section when each divided portion is fully rolled, but in the conventional rolling method of parallel rolling between the same rolls, it is necessary to change the pending force between both ends of the rolls and the inner m11. Is it difficult to do an edge drop? The problem was that it was difficult to form.

[Purpose of the invention]

An object of the invention is to provide a parallel rolling method that eliminates the above-mentioned drawbacks, allows desired shape modification of both serially rolled materials, and allows efficient use of rolls. .

[Summary of the invention]

In the present invention, rolling is carried out between two upper rolls and between two lower rolls of a plate rolling mill having four or more rolls, and each rolling machine is passed through each roller at the same time. The above object is achieved by making the plate width of the material less than half the length of the roll surface, rolling the material first with one half of the roll, and then rolling with the other half of the same roll.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

Figure 2 shows a plan view of the arrangement of the girder body, showing a rolling tray of a wide strip steel dividing processing equipment to which the uninvented rolling method is applied, and Figure 3 shows a front view of Figure 2. The wide steel strip 6 rolled in a cold tandem mill is transferred from the 1st stand 7 to the 4th stand 8.
After being rolled, it is divided into 2 pieces by a slitter 9 provided on the exit side of the &4 stand 8. A separator 11 is provided between this slitter 9 and the final stand, that is, the A5 stand 10.
is installed. The wide steel strip 62 divided by the separate slitter 9 and the divided steel strips 12 and 13 are gradually divided and moved in the width direction by the separator 11 so that a predetermined interval 15 is maintained between the two divided portions. It moves and separates vertically at the same time. Further, a looper roller 14 is installed between the separator 11 and the breather stand 1o, and each of the vertically separated portions 12 and 13 is held under a predetermined tension. Try to keep it stable. The divided steel strips 12.degree. 13 of the wide steel strip 6 thus divided in the width direction and the vertical direction are then rolled in the A5 stand IOK, which is the main part of this embodiment.

The fourth figure shows an example of the A5 stand 10, that is, the rolling mill 10, and the rolling state of the split strip steel 12.13. The rolling mill 1o has upper and lower reinforcing rolls 21, 22, It consists of upper and lower intermediate rolls 23, 24 and upper and lower work rolls 25, 26 whose movement can be adjusted in the axial direction according to the sheet width.

In rolling @1O having such a configuration, among the split strip steels 12 and 13 after being split, the split strip steel 12 passes between the upper intermediate roll 23 and the upper work roll 25, and the split strip steel 13 passes between the upper intermediate roll 23 and the upper work roll 25. It is rolled by passing through one side between the lower work roll 26 and the lower intermediate roll 24, respectively.

According to this rolling method, as shown in FIG. 5, the dividing side L2a in the width direction of the divided steel strip is more likely to form an edge drop as compared with the opposite side plate end 12b. That is, this division 1jlU12a is above.

The moment arm due to the rolling load P0 by the lower reinforcing rolls 21 and 22 is long, and from this point
Since there is no +dog, the pressure distribution at the end of the divided side 12a is as shown in Fig. 6, where the divided end side A has the component -, and the jlJ end side B
This is because it will be higher than that. However, this rolled Toguchi Emperor P. It is difficult to obtain an arbitrary edge drop shape due to the rolling reduction ratio, etc. Therefore, by separately controlling the intermediate roll bender P+ and the Sakuto roll bender PW (1 drive side), The weight distribution of the parts is changed as shown in a-b in Figure 6, and further,
Intermediate rolls 23 and 24t - By moving and adjusting the strain in the axial direction, a caloric weight distribution for a wide range of rolled plate material can be obtained. Therefore, a wide range of shape control is possible, and an appropriate edge drop can be obtained. It has become.

In addition, in the above rolling method, the portion of each roll that contacts the rolled steel strip is half of the roll surface length, and the remaining half does not contact the steel strip, so there is no roughening or wear. Therefore, after one side of each roll has left the shore, the upper and lower divided steel strips 12 and 13 are exchanged to form a pass, without rolling again, until the entire roll surface length is worn out.
It can be used effectively. That is, a pass in which the split strip steel 13 is over-rolled on one side between the upper intermediate roll 23 and the upper work roll 25, and the split strip zJ12' is over-rolled on one side between the lower work roll 26 and the lower intermediate roll 24? Just form it.

By the way, if it is only used for rolling @10 k or for rolling divided steel strips, its range of use is narrowly limited. However, the rolling mill 10 of this embodiment can also roll the wide steel strip 6. That is, - rolling the wide steel strip 6 by passing it between the upper and lower work rolls 25, 26; in this case, the rolling mill 10
will be used as the stand 10 for A6.

Of course, in this case, the slitter 9X separator 11 in front of the rolling line (shifted outside the d line,
This is done by eliminating the A6 dividing mechanism.

Note that the rolling mill 10 shown in FIG. 4 has six rolls, but if the number of rolls is six or less, the
．． 22, the split strip steel 12,
13, a good edge drop can be completely formed.

However, all of the above rolling methods can be realized even with a rolling mill structure using four rolls, although the formation of edge drops is somewhat compromised.

According to this embodiment, the split steel strip 12 obtained by dividing the wide steel strip 6 is
．． 13' and roll them by passing them between the upper intermediate roll 23 and the upper work roll 25 and between the lower intermediate roll 24 and the lower work roll 26 of the rolling mill xo. Appropriate edge drops can be formed at the ends of the board width of 12°13. Therefore, the occurrence of edge overcoat during plating can be avoided, waste can be eliminated during plating processing, and quality can be improved during stocking. Furthermore, in this example, rolling is carried out by passing the divided strip steel 12.13 through only one side of each n rolling roll, and after one side of each roll is worn out, the divided strip steel 12.13 is rolled.
By replacing the passes, each roll is not worn out.
Ike no Kata 111? Li? - Since it can be used, the roll unit price can be reduced and maintenance costs can be reduced. can be reduced.

〔Effect of the invention〕

According to the parallel rolling method according to the present invention as described above,
By separating each strip vertically and rolling them using only one side of a special roll installed vertically, the shape of each strip can be modified independently, resulting in a good shape at the edge of the strip width. Edge drops can be formed, and the roll cost and maintenance can be reduced by using up-and-down conversion.

[Brief explanation of the drawing]

Figure 1 (2) is a cross-sectional view showing the cross-sectional shape of wide band steel;
rl Figure CB) is a cross-sectional view showing an example of the cross-sectional shape of a split strip steel divided by the conventional splitting method, and Figure 2 shows an example of the splitting processing device in which the rolling force J of the present invention is fully applied. Fig. 3 is a front view of Fig. 2, Fig. 4 is a side view showing an embodiment of a rolling mill embodying the rolling method of the present invention, and Fig. 5 is a view during rolling. FIG. 6 is an explanatory diagram showing the distribution of the load applied to the rolled steel strip. 10...Rolling mill, 11...Separator, 1i, 13
... Split band steel, 21... Upper reinforcing roll, 22...
Lower reinforcing roll, 23... Upper intermediate roll, 24... Lower intermediate roll X (A) / CB) 4.5

Claims (1)

[Claims] (1) In a parallel rolling method in which steel strip f is rolled in parallel in the helical direction, a rolling mill having at least 44 or more rolls arranged above and below is used to roll each steel strip above and below. The steel strip is passed simultaneously between two rolls on the upper and lower sides of the steel strip on one side, and between the rolls on the upper and lower sides of the steel strip on the other hand, and the surface length of each valley roll is at least twice the width of the steel strip. , a parallel rolling method characterized in that less than half of the pieces 1011 of each roll are rolled. The 2° rolling mill consists of a pair of reinforcing rolls, a 1 inch intermediate roll placed inside these reinforcing rolls and movable in the axial direction, and a pair of work rolls placed inside these intermediate rolls. , above each imperial bronze. The parallel rolling method according to claim 1, characterized in that rolling is carried out between an intermediate roll located below and a work roll 1.