JPS5829502A - Rolling device for metallic strip - Google Patents

Abstract

PURPOSE:To obtain a strip having a good shape with a small number of stands by arranging a 1-stand 3-pass rolling mill, a 1-pass high screw-down rolling mill and a rolling mill of adjustable roll crown shapes successively in tandem thereby constituting a rolling device. CONSTITUTION:A 1-stand 3-pass rolling mill 1 is constituted by arranging four pieces of work rolls 2, 3, 4, 5 and backup rolls 6, 7 vertically and rolling a strip S at high draft of about 60-70% by 3 passes. The next sextuple rolling mill 11 is provided with work rolls 12, 13 and backup rolls 14, 15, 16, 17, rolls the strip at relatively high draft of about 30-45% and corrects the defective shape of the strip S slightly. The next sleeve shift type four-high rolling mill 21 is provided with work rolls 22, 23, backup rolls 24, 25 and sleeves 26, 27, and gives required roll crown shapes to the rolls 22, 23 by changing the positions of the sleeves 26, 27, thereby correcting the shape of the strip S.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling apparatus for metal strip, and more particularly to a rolling apparatus having a plurality of rolling mills arranged in tandem.

Generally, several rolling mills are arranged in tandem on a cold rolling line.For example, when the total rolling F ratio exceeds 80% in a cold rolling line for ordinary steel, a 6-fold rolling mill is used to reduce the rolling mill stand. Both require four stands, and a quadruple rolling mill requires five stands.A rolling apparatus with several stands arranged in this way requires a large amount of equipment cost and requires a long rolling line.

Furthermore, the more stands there are, the more time it takes to replace the rolls, thread the strips, etc.

Therefore, it is possible to reduce the number of stands by rolling at a high rolling reduction ratio in each rolling mill. However, when rolling is performed at a high reduction rate (50 to 70%) in one bath, roll deflection becomes very large, and there is a problem that it is difficult to obtain a good strip shape (cross-sectional shape in the width direction of the strip).

The purpose of this invention was to solve the above-mentioned problems in strip rolling equipment, and it is possible to achieve the required total downstream rate with a small number of stands, and to obtain strips with good shape. It is an object of the present invention to provide a metal strip rolling device that can be rolled.

The rolling apparatus of the present invention is constructed by sequentially arranging in tandem a one-stand three-pass rolling mill, a one-pass high-reduction rolling mill, and a rolling mill whose roll crown shape can be adjusted.

A one-stand three-pass rolling mill is a rolling mill in which four work rolls are arranged so that adjacent work rolls form rolling passes, and is disclosed, for example, in Japanese Patent Laid-Open No. 5G-17105. ing. The one-pass high-reduction rolling mill is, for example, a 6-height rolling mill, an asymmetrical (Japanese Patent Application Laid-Open No. 50-72853), or a symmetrical cluster rolling mill (4 Temple Gansho No. 56-74902), and one pass is about 30 to 45%. This is a rolling mill that can roll at a rolling reduction rate of . In addition, rolling mills in which the crown shape of the work roll can be adjusted include intermediate roll shift (e.g., Japanese Patent Publication No. 52-530/1), sleeve shift (e.g., Japanese Patent Application Laid-open No. 53-48049), intermediate roll bender, and work roll bender. This rolling mill is equipped with at least one of the following functions, and the crown shape of the work roll can be adjusted.

In the rolling apparatus of the present invention, the first rolling mill, that is, the one-stand three-pass rolling mill, rolls the yield at a high rolling reduction rate of, for example, 60 to 70%, and then the one-pass high-reduction rolling mill rolls the yield at a relatively high rolling reduction. rolling rate (for example, 30-45%). ■The pass high-reduction rolling mill slightly corrects the shape defects of the strip rolled by the one-stand three-pass rolling mill. In the third rolling mill, the downstream rate is as low as 10 to 30%, but the shape of the strip is modified here to a good shape required for the final product.

Since the rolling apparatus configured as described above includes three rolling mills, it is possible to make the rolling line more compact and reduce equipment costs.

In addition, because it combines a 1-stand 3-pass rolling mill with a rolling mill whose work roll crown can be adjusted, a good shape can be achieved even when rolled at a total reduction rate of 80% or more, even with three rolling mills. You can get strips of.

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

FIG. 1 shows an example of the present invention, and is a block diagram of a rolling apparatus.

1 stand 3 pass rolling mill 1 has 4 work rolls 2, 3
, 4.5 and two backup rolls 6.7 arranged vertically. Adjacent work rolls 2 and 3
．． 3 and 4 and .1 and 5 form rolling passes, respectively. The strip S is wound around the inner work rolls 3 and 4 over a half circumference and is passed through three 1f elongated passes formed by the work rolls.

"2. 1-stand 3-pass rolling mill 1 followed by 6-pass rolling mill]
1 is placed. 6-heavy rolling mill] 1 is work roll 1
2.13 and backup rolls 14, 15°1.
6.17 is a conventional strip rolling mill.

Since this six-layer rolling mill 11 performs high reduction rolling in one pass, it is equipped with a roll crown correction function using a roll bender or the like.

Furthermore, following the above-mentioned 6-heavy rolling mill 11, a sleeve shift type 4
A heavy rolling mill 21 is provided. This rolling machine 2] bar
A pair of work rolls 22 and 23, a pair of bank up rolls 271 and 25, and each backup roll 2
4, 25 are provided with sleeves 26, 27 which fit loosely on the outside. The sleeves 26, 27 are movable in the roll axis direction. Depending on the position of the sleeve 26, 27 relative to the work roll 22, 23, the position of the point of application of the force applied from the backup roll 24, 25 to the work roll 22, 23 changes. By this change in position, the desired roll crown shape can be given to the workpiece rolls 22 and 23, and the shape of the strip S rolled by the two front rolling mills 1 and 11 can be corrected.

FIG. 2 shows another embodiment of the present invention, and is a block diagram of a rolling apparatus. The first stage rolling mill is the same as in the previous example and is therefore designated with the same reference numerals.

The second stage rolling mill 31 is a six-layer rolling mill equipped with a roll bender (not shown). This rolling mill 31 rolls the strip S, which has been rolled once by the preceding one-stand three-pass rolling mill 1, at a relatively high rolling reduction rate and with a slight modification of the strip shape, as described above.

The third-stage rolling mill is also a six-layer rolling mill equipped with a roll bender (not shown), similar to the second-stage rolling mill [31]. Although the rolling mill 41 has a low downstream rate as described above, it corrects the strip into the desired shape. For this reason, in the third stage rolling mill 41, the crown shapes of the work rolls 2, 43 can be adjusted over a fairly wide range.

6- Here, an example of strip rolling by the apparatus of the second embodiment will be described.

Plate thickness 4. A hot coil having a thickness of Q mm and a width of 950+++ m was cold rolled into a strip having a thickness of 0.77 mm and a width of 950 mm. The total reduction rate is 80.8%. The roll diameter and rolling reduction ratio of each rolling mill are shown in Table 1.

Table 1 The above rolling resulted in strips of the required dimensions and shape.

FIG. 3 shows an example of application of the present invention, which is a cold-rolled strip production facility including a rolling apparatus of the present invention.

Following the two rewind reels 51 and 52 that are used alternately, a shear 53, a wells 54, and a priddle roll 5
5 and a looper 56 are provided.

The shear 53 performs side trimming of the hot coil H, and the well 54 welds and connects the preceding hot coil to the succeeding hot coil. Further, the louver 56 adjusts the supply of the hot coil H to the rolling device 50.

Following the louver S6, there is a prydle roll 57, a rolling device 50, a prydle roll 58, a high-speed cutting machine. 9 and take-up reels 60, 6].

The rolling apparatus 50 is identical to the apparatus shown in FIG. The high-speed cutting machine 59 cuts the rolled strip S into required dimensions.

Prydle rolls 57, 58 provided in the line apply appropriate tension to the pot coil H and strip S.

In the cold-rolled strip manufacturing equipment configured as above,
A plurality of hot coils are rolled into one. Therefore, the coil threading time is significantly shortened. Furthermore, since off-gauges at the top and bottom of the hot coil are reduced, yield can be improved.

The cold-rolled strip manufacturing equipment described above is operated continuously for a long time, and the line is also considerably long.

Therefore, since the number of rolling mills is small (L/X), failures of the rolling apparatus are reduced and the length of the rolling line is shortened. This makes it even more effective.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 each show an embodiment of the present invention, and are block diagrams of a rolling apparatus. FIG. 3 is a schematic diagram of a cold rolling stock one-knop manufacturing facility including a rolling apparatus of the present invention. 1...1 stand 3/kus rolling mill, 2~5...
Work roll, 6,7...Knock-up roll, 11.31...6-heavy rolling mill, 12,1.3...
Work rolls, 14-17...Backup rolls, 21.41...Roll crown adjustable rolling mill,
,・22, 23. 42. 43... Work roll, 2/1.25... Bank up roll, 2
6.27...Sleeve, 50...Rolling device. = 9 - Figure 1 Figure 2

Claims (1)

[Claims] A one-stand three-pass rolling mill in which four work rolls are arranged so that adjacent work rolls form rolling passes;
A metal strip rolling apparatus characterized in that a pass high reduction rolling mill and a rolling mill in which the crown shape of the work roll can be adjusted are sequentially arranged in tandem.