JPS62114707A - Tandem rolling mill - Google Patents

Abstract

PURPOSE:To reduce the time for exchanging work rolls and to improve the safety by disposing shears to cut a steel strip in the transverse direction to at least one point between stands. CONSTITUTION:The shear 16 is provided to the inlet side of the 1st stand S1 of a tandem rolling mill 14 having a welding machine 12 for connecting the steel strip 10 on the inlet side. The shears 161-16n are disposed between the respective stands S1-Sn. The steel strip 10 is cut by the shear 16n-2 just before the (n-1)st stand, the preceding strip is removed and the work rolls are exchanged in the case of exchanging the work rolls of the (n-1)st stand. The roll exchange is executed simply by removing the preceding strip from the (n-1)st sand and passing the strip through the subsequent stands Sn-1 and Sn after the exchange of the work rolls according to the above-mentioned method. The time for exchanging the work rolls is thus reduced and the safety is improved.

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD 1 This invention relates to tandem rolling mills, and more particularly to improvements in fully continuous cold tandem rolling mills. [Prior Art] In the cold rolling process, which is one of the manufacturing processes for copper strips,
The hot-rolled steel strip that has been pickled in the previous step is wound into a coil, and this coil is rolled while being unwound to finish the steel strip to a predetermined thickness. In order to improve production efficiency during cold rolling,
Traditionally, tandem rolling has been commonly used in which multiple rolling mills are arranged in series to continuously roll a copper strip. A fully continuous tandem rolling mill (hereinafter referred to as an FC mill) 2 has appeared that welds the end and the tip of a trailing coil on the entry side using a welding machine 1 to continuously roll a plurality of coils. In FIG. 4, numeral 3 is a rewinding reel, 4 is an entry shear,
Reference numeral 5 indicates a take-up reel, and reference numeral 6 indicates a copper strip. Generally, the work rolls of a rolling mill are frequently replaced periodically due to wear or unexpectedly when trouble occurs. Even in the above-mentioned FC mill, the work rolls are frequently replaced, but when such rolls are replaced, the continuous steel strip 6 gets in the way of the work roll replacement. [Problem to be Solved by the Invention 1] In this case, the steel strip 6 is cut by the entry shear 4 installed on the entry side of the FC mill 2 shown in FIG. Since the band 6 has to be taken out of the mill and the trailing plate must be rethreaded after the work rolls are replaced, there is a problem in that production efficiency is reduced. In particular, when the frequency of work roll replacement is 1 for the intermediate stand, the frequency for the 1st stand is about 2, and the frequency for the final stand is about 4, so the frequency for the final stand is very high. Therefore, when replacing the work roll on the final stand, F
Assuming that the steel strip 6 is cut at the entrance side of the C mill 2, NO, 1
A problem arises in that the plates of all the stands from the stand to the final stand must be removed and the copper strips must be passed through all the stands again. Also, when replacing the work roll only on the final stand,
Since the thickness of the steel strip 6 is thin at the final stand position, a method of manually cutting the steel strip 6 may be considered, but this increases the cutting time and poses a safety problem. (Objective of the Invention 1) This invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a tandem rolling mill that allows roll changes to be made safely and in a short time. .

[Means for Solving the Problems] This invention is a tandem rolling mill equipped with a welding machine for connecting the copper strips on the entry side, in which the copper strips are cut in the width direction at at least one location between each stand. The above objective is achieved by arranging a shear for this purpose. Further, the above object is achieved by arranging the shear on the entrance side of the final stand. [Function] In this invention, since a shear for cutting the steel strip in the width direction is arranged at least in one place between each stand of the tandem rolling mill, the steel strip is cut by the shear closest to the stand where work rolls need to be replaced. The work roll can be replaced safely and in a short time by cutting the work roll.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. This embodiment has a steel strip on the entry side, as shown in FIG.
In addition to the entry side shear 16 installed on the entry side of the first stand S1, between each of the stands 81 to Sn, Shear 1 for cutting the steel strip 10 in the width direction
61 to 16n-1 are arranged. Since the other configurations are the same as the tandem rolling mill shown in FIG. 4, the same reference numerals as in FIG. 4 are used to omit the explanation. In the tandem rolling mill 14 according to this embodiment, for example, as shown in FIG.
When replacing the + work roll 18n+, the steel strip 10 is cut by the N shear 16n2, the leading plate is extracted, and the work roll 18n+ is replaced. By doing this, conventionally it was necessary to remove the boards from all the stands by the entry side shear 16 and pass the boards through all the stands again after replacing the work roll, but according to this embodiment, the board is removed from the n+th stand. The process is completed by simply removing the preceding plate and passing the plate through the n-1st stand Sn + and the nth stand Sn after replacing the work roll 18n-1. Therefore, the work time for punching and threading the sheets is significantly reduced. In this case, the working time can be reduced to 2/n compared to the case where the steel strip 10 is cut by the entrance shear 16. In the above embodiment, the tandem rolling 114 is provided with shears 161 to 16n-+ between the stands 81 to Sn, respectively, but the present invention is not limited to this, and one or more shears are provided between the stands 81 to Sn. ! This is generally applied when a shear is provided between two arbitrary stands. Especially when installing only one shear between stands, the third
As shown in the figure, it is provided on the entrance side of the n-th stand Sn, which is the final stand. Since roll replacement is most frequent at the final stand where the length of beating and rolling is longer and roll flaws tend to remain on the plate surface, it is more efficient to install the shear on the entry side of the n-th stand Sn. For example, in a 6-stand mill, if it takes 60 seconds to punch out and pass through all the stands, if the present invention allows the steel strip to be cut by the shear on the entry side of the 6th stand, which is the final stand, then the work roll If the exchange is 5 times/day, (60" - 60" x 1/6) x 5 times/day x 36
5 days/year = 91°250″/year, approximately 2 days per year
The work time can be reduced by 5 hours. It is also possible to install a shear between the stands of a tandem rolling mill like the one mentioned above at every other stand, but in this case, when replacing the work roll of a stand that does not have a shear on the entry side, The work rolls can be easily replaced by cutting the steel strip with the exit shear and returning the steel strip to the entry side. [Effect of the Invention 1] Since the present invention is configured as described above, it has an excellent effect that work rolls can be replaced safely and in a short time in a tandem rolling mill.

[Brief explanation of drawings]

Fig. 1 is a roll arrangement diagram showing an embodiment of the present invention;
The figure is a roll layout diagram showing the state when the work rolls are replaced in the same embodiment, Figure 3 is a roll layout diagram similar to Figure 1 without showing another embodiment of the present invention, and Figure 4 is a conventional complete continuous roll layout diagram. FIG. 2 is a roll arrangement diagram showing a type tandem rolling mill. 1o...Copper strip, 12...Welding, 14...Tandem rolling mill, 81-Sn...1st to nth stands, 16...Entry side shear,

Claims (2)

[Claims] (1) Tandem rolling in which a shear for cutting the steel strip in the width direction is arranged in at least one place between each stand in a tandem rolling mill equipped with a welding machine for connecting the steel strip on the entry side. Machine. (2) The tandem rolling mill according to claim 1, wherein the shear is arranged on the entry side of the final stand.