JPH0890002A - Bar rolling mill - Google Patents

Abstract

PURPOSE: To immediately execute sizing of a material which is finished by rolling with a required rolling mill train with a sizing mill by changing a changing stand and incorporating a unit type sizing mill having interchangeability with the changing stand in the line. CONSTITUTION: In ordinary rolling, that is, when sizing is not executed in the finishing rolling mill train, finish rolling can be executed in the state that this changing stand 8 is left as provided in the line. On the other hand, when accurate finish rolling is executed by sizing in the finishing mill train, this changing stand 8 is pulled out to the outside of the line from a sole plate 9, the sizing mill 6 is incorporated in the line and fixed on the sole plate 9. Such incorporable sizing mill 6 is a unit type having a horizontal and vertical stands and, furthermore, taken as the constitution having interchangeability with the changing stand. Then, the sizing mill is incorporated in conventional equipment without modification and without requiring a large space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel strip rolling mill, and more particularly, to a steel strip rolling mill for sizing finished steel bars and wire rods after finishing rolling to obtain a product with high dimensional accuracy.

[0002]

2. Description of the Related Art Conventionally, a bar or bar, which is a representative of the bar rolling equipment,
In the wire rod rolling equipment, after heating the steel slab, the rough rolling mill train, the intermediate rolling mill train, and the finishing rolling mill train are sequentially rolled to finish,
It was as a product. And at that time, when trying to obtain a product with strict dimensional accuracy by rolling according to the request from the user, in addition to temperature control in the heating furnace, adjustment of the gap between guides and rolls, shape of roll caliber and loop The problem was dealt with by making detailed adjustments on the rolling mill that finishes the product, such as adjustments and improving the control performance of the electric control system.

However, as shown in FIG. 5, the heating furnace 1, the row of rough rolling mills 2, the row of intermediate rolling mills 3, the row of finishing rolling mills 4, and the conditioning equipment 5 (not shown) are laid out as one line. In the case of the rolling equipment, the manual adjustment is the main factor, and there are many problems in automation. Therefore, as shown in FIG. 6, a line in which a sizing mill 6 for improving the dimensional accuracy of a product is installed behind the finishing mill row 4 has been studied.

This sizing mill is a device intended to easily obtain a product having good dimensional accuracy without entrusting the rolling operator with the adjustment.

[0005]

However, when the sizing mill is installed at the rear of the finishing rolling mill train, there are the following problems. (1) When it is installed at the rear of the finishing rolling mill row, a new installation space is required, and it is impossible to add it to the conventional mill line.

(2) Some products may be finished by a row of rough rolling mills, or may be finished by either a row of intermediate rolling mills or a row of finishing rolling mills. However, one sizing mill cannot handle a wide range of torques and speeds. (3) In particular, in the case of a straight bar finished in one of a rough rolling mill row and an intermediate rolling mill row, in order to size it with a sizing mill at the rear of the finishing rolling mill row, it is necessary to allow time after split cutting. In this case, there is a problem that the roll life of the sizing mill is extremely shortened due to a decrease in the temperature of the material and an increase in the number of bites.

The present invention solves the above-mentioned drawbacks of the prior art,
It is an object of the present invention to provide a steel strip rolling mill that can quickly size materials finished by a required rolling mill row according to the product, and can easily incorporate a sizing mill even in an existing rolling line. is there.

[0008]

In order to achieve the above object, the present invention can be realized by installing a sizing mill in the line of each rolling mill row instead of installing it in the rear of the finishing rolling mill row. It was done. That is, in the strip rolling mill according to the present invention, in essence, at least one stand in each rolling mill row is used as a reshuffling stand, and a unit type sizing mill having compatibility with the reshuffling stand is used as the reshuffling stand. It is characterized in that the material finished by rolling of a required rolling mill row is immediately sized by the sizing mill by replacing and incorporating it in the line.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. As described above, in the strip steel rolling mill according to the present invention, depending on the product, when finishing with a rough rolling mill row, when finishing with an intermediate rolling mill row through a rough rolling mill row, and further with a rough rolling mill row and an intermediate rolling mill row In this case, at least one stand is set as a reassignment stand for each rolling mill row, and a set of rolling mill rows for performing finish rolling is used in strip rolling. The replacement stand is pulled out of the line, and a unit-type sizing mill is installed therein. The sizing is performed immediately after finish rolling.

Since the composition of the reassembling stand and the sizing mill which can be installed at this position so as to be incorporated therein is basically the same for each rolling mill train, the case of the finishing rolling mill train will be described below as an example. 1 to 4 show the configuration of a finish rolling mill train in a strip rolling mill according to an embodiment of the present invention.

FIG. 1 shows a part of a line in the case where one stand in the finishing mill train is a reassignment stand.
FIG. 2 shows a case where a sizing mill is incorporated at the position of the reassembling stand. One of the continuous stands in the finishing mill train is referred to as a rearranging stand 8. In the case of normal rolling, that is, when sizing is not performed in the finishing mill train, the rearranging stand 8 is used. The finish rolling can be performed while being installed in the line. Of course, the stand 8 is a stand having the same configuration as that of the related art. The stand 8 is fixed on the sole plate 9, the guiding device 10 is provided between the stand 8 and the front stand 7, and the stand 8 is provided between the stand 8 and the rear stand 7 ′. Also guidance device 10 '
Is provided.

On the other hand, when sizing is performed in a finishing rolling mill row to perform precision finishing rolling, the rearranging stand 8 is pulled out of the line from the sole plate 9, the sizing mill 6 is assembled into the line, and the sole plate 9 is mounted. Fix on top. The sizing mill 6 that can be incorporated in this way is
Unit type with horizontal and vertical stands,
Moreover, it is necessary to have a configuration compatible with the reassembling stand 8, and the type thereof is not particularly limited, such as a two-roll type, a three-roll type, a four-roll type, a two-stage mill, or a three-stage mill. Of course, the sizing mill depends on the sizing load,
It is necessary to use high torque and low speed for rough rolling, medium torque and medium speed for intermediate rolling, and low torque and high speed for finishing rolling. There is no end.

FIGS. 3 and 4 are views showing an example of the sizing mill 6, FIG. 3 is a plan view, and FIG. 4 is A- of FIG.
FIG. This sizing mill 6 is a unit-type sizing mill consisting of two two-stage horizontal stands and one two-stage vertical stand. It rolls a steel strip having a circular cross section to be sized to a true circular cross section in three passes by light reduction. In order to obtain, three sets of a pair of horizontal roll 12a, vertical roll 13a, and horizontal roll 14a are accommodated in compact roll stand unit 15, respectively, and are constituted.

The first roll 12a and the third roll 14a
Is fixed on a pair of horizontal spindles 12 and 14 supported by pinion stands 16 and 17 in a roll stand unit 15, respectively, and is connected to a drive unit 20 via a distribution reduction gear 18. The first roll 12a and the third roll 14a are rotationally driven by 20.

The second roll 13a has a vertical spindle 13 whose base is accommodated in a vertical roll speed reducer 21.
It is fixed on the top and is likewise rotationally driven by the drive device 20. 1st roll 12a and 2nd
Between the rolls 13a and between the second roll 13a and the third roll 14
The width guides 22 and 23 are provided between the a in the traveling direction of the steel bar, respectively, while the inlet guide 24 is provided at the upstream end of the roll stand unit 15 in the traveling direction of the steel bar (the arrow direction in the drawing). An outlet guide 25 is provided at the downstream end.

Further, the sizing mill 6 is compatible with the rearrangement stand 8 with respect to the driving device and the mounting portion (sole plate). That is, the driving device 20 of the rearranging stand 8 is used as it is, the sole plate 9 is also used for fixing the sizing mill 6, and the guiding devices such as loopers before and after the sizing mill 6 are also the guiding devices 10, 10 'of the rearranging stand 8. Divert. In addition, the electric control system of the rearrangement stand 8 is also used. It should be noted that the drive source is the rearrangement stand 8
Therefore, the driving force of the sizing mill 6 is equal to or less than the driving force of the rearranging stand 8, and therefore, the total surface reduction amount in the sizing mill is within the capacity of the rearranging stand 8.

The relocation stand 8 and the sizing mill 6 can be put in and out of the stand by using an appropriate stand exchange system such as a crane lifting system or a rail exchange system.

[0018]

As described in detail above, according to the present invention,
Since the unit type sizing mill in which a plurality of vertical stands and horizontal stands are integrated is incorporated into the existing rolling line, the following excellent operational effects are achieved. (1) A dedicated space for a sizing mill, a driving device, a mounting base, a guiding device, and an electric control system are unnecessary, and the sizing mill can be incorporated into conventional equipment without remodeling and taking up space.

(2) For example, a high-torque, low-speed one for a rough rolling mill row, a medium-torque, medium-speed one for an intermediate rolling mill row, a low-torque, high-speed one for a finishing rolling mill row Thus, a sizing mill according to the sizing load can be installed. (3) Since sizing can be performed immediately after finish rolling in a rolling mill train according to the product, it is possible to handle undivided products at the same temperature as finish rolling, and therefore the life of the sizing roll can be greatly extended. .

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a part of a mill line of a finish rolling row in a strip rolling mill according to an embodiment of the present invention, showing a case of normal rolling with a reassembling stand installed.

FIG. 2 is an explanatory view showing a part of a mill line of a finish rolling row in a strip rolling mill according to an embodiment of the present invention, showing a case where a unit type sizing mill is incorporated.

FIG. 3 is a partially cutaway plan view showing an example of the sizing mill of FIG.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a view showing an example of a conventional strip rolling line;
An example in which a sizing mill is not installed is shown.

FIG. 6 is a view showing an example of a conventional bar steel rolling line,
The example which installed the sizing mill is shown.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 heating furnace 2 row of rough rolling mills 3 row of intermediate rolling mills 4 row of finishing rolling mills 6 sizing mill 8 reassembling stand 15 roll stand unit 20 drive device

Claims (1)

[Claims] 1. A row of rough rolling mills, a row of intermediate rolling mills, and a row of finishing rolling mills each having two or more stands and rolling stands having a circular cross section, are arranged, and after heating a billet, a product is produced. According to, in the steel bar rolling machine to obtain a steel bar and wire rod by finishing in a rolling mill row, among the rolling mill rows,
The stand immediately after the stand for rolling the steel strip into a circular cross section is used as a reassembling stand, and the unit-type sizing mill for rolling the steel strip with a circular cross section under light pressure is used for the reassembling stand, the mounting portion dimensions, and the drive unit coupling. A steel strip rolling mill characterized in that it can be installed in a line by exchanging it with the reassembling stand by having a configuration compatible with the above.