JPH0796301A - One serial rolling method - Google Patents

Abstract

PURPOSE:To improve actual working rate and consumption unit of roll. CONSTITUTION:A 1st sizing mill SM1 and 2nd sizing mill SM2 are arranged in series along the pass line of a material to be rolled. Each sizing mill SM1, SM2 can select two kinds of reduction rate of area and also composed so as to be capable of retreating from the pass line. And, in a pattern by which the material to be rolled which is rolled into required cross-sectional dimensions by passing through an intermediate train is passed through only the 1st sizing mill SM1 or the 2nd sizing mill SM2 and pattern by which the material is passed through both the sizing mills SM1, SM2, plural serialized products are manufactured in the range of the required cross-sectional dimensions by respectively changing the reduction rate of area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to two sizing mills configured to allow a plurality of different surface reduction ratios to be selected for a material to be rolled which has been passed through an intermediate row of a rolling process and rolled to a required cross-sectional dimension. The present invention relates to a one-series rolling method in which a plurality of products that are made into a series in a required size range are manufactured by passing the products through a series.

[0002]

2. Description of the Related Art Pass schedules for rolled materials such as steel bars and wire rods are generally roughly classified into a rough row, an intermediate row and a finishing row.
The raw material heated to the required temperature is rolled to a required cross-sectional dimension through a coarse row and an intermediate row, and then rolled to a desired final cross-sectional dimension (cross-sectional shape) by a finishing row. A sizing mill equipped with a plurality of rolling mills is preferably used for this finish rolling.

[0003]

When manufacturing a plurality of products in a series in which the final sectional dimension of the material to be rolled is, for example, 40φ to 78φ, a pass schedule as shown in FIG. 5 is set. . That is, the material to be rolled that has been rolled to a required cross-sectional dimension by the rough row has a hole shape of 72φ.
By passing through the first intermediate row set to -57φ-46φ, the cross-sectional dimension is rolled to 46φ. Then, the material to be rolled is passed through a sizing mill SM equipped with a rolling roll having a first hole die to obtain a product having a final cross-sectional dimension of 40φ to 42φ.
Further, in the first intermediate row, the material to be rolled having a cross-sectional dimension of 57φ is passed through a sizing mill SM which is replaced with a rolling roll having a second hole die, so that the final cross-sectional dimension is 50φ to A product of 53φ is obtained, and a material to be rolled having a cross-sectional dimension of 72φ is passed through a sizing mill SM which is replaced with a rolling roll having a third hole die, so that the final cross-sectional dimension is 63φ to 66φ.
The product of is obtained.

Further, the intermediate row in the pass schedule is replaced with a second intermediate row in which the hole shape is set to 77φ-62φ-49φ, and the material to be rolled which is rolled by the intermediate row to a sectional size of 49φ is By passing through a sizing mill SM equipped with rolling rolls having first to third holes, the final cross sectional dimension of the material to be rolled of 49φ is 43
A product with a diameter of φ to 46φ is obtained, and a product with a final cross sectional dimension of 54φ to 57φ is obtained from a material to be rolled having a diameter of 62φ.
A product having a final cross-sectional dimension of 67φ to 72φ can be obtained from the rolled material of φ. Further, the middle row in the pass schedule is the third type in which the hole type is set to 80φ-64φ-53φ.
In place of the intermediate row, the material to be rolled having a cross-sectional dimension of 53φ by the intermediate row is passed through a sizing mill SM equipped with a rolling roll having the first to third hole patterns, so that The final cross-sectional dimension from the material to be rolled is 4
7φ to 49φ products are obtained, and products with final cross-sectional dimensions of 58φ to 62φ are obtained from 64φ rolled material.
A product having a final cross-sectional dimension of 73φ to 78φ can be obtained from a 0φ rolled material.

That is, when manufacturing a plurality of products in series within the required cross-sectional dimension range, as shown in FIG.
As in the case of the A series, B series, and C series, it has been necessary to carry out large-scale replacement of the intermediate columns for each series. In this case, there is a drawback in that the time required for large-scale replacement becomes long and the actual work rate decreases. Further, after the large-scale replacement, it is necessary to inspect the shape and size of the material to be rolled rolled in the intermediate row, and the loss time required for this inspection also causes a reduction in the actual operating rate. In addition, it is pointed out that roll unit consumption in the middle row and roll inventory management become extremely complicated.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems, and it is an object of the present invention to provide a one-series rolling method capable of improving the actual working ratio and the roll unit. And

[0007]

In order to overcome the above-mentioned problems and preferably achieve the intended purpose, the one-series rolling method according to the present invention is carried out by passing through an intermediate row of the rolling process and rolling to a required cross-sectional dimension. In the rolling method of performing finish rolling by passing the material to be rolled through a sizing mill provided with two or three units, different reduction ratios can be selected along the pass line of the material to be rolled. A first sizing mill and a second sizing mill are arranged in series, and when finish rolling the material to be rolled that has been rolled to a required cross-sectional dimension in the intermediate row, either or both of the first and second sizing mills are used. Along with the use, by changing the combination of area reduction ratios that can be selected in each sizing mill and rolling, it is possible to manufacture products in series in the required cross-sectional dimension range. To.

[0008]

EXAMPLES Next, the one-series rolling method according to the present invention will be described.
A preferred embodiment will be described with reference to the accompanying drawings. FIG. 1 shows a finishing row of a hot rolling process, and the finishing row has two sizing mills SM1 and SM2.
The first sizing mill SM1 and the second sizing mill SM2 are each constituted by three rolling mills 10, 12, 14 arranged in series. Since the structures of the sizing mills SM1 and SM2 are the same, the structure of the first sizing mill SM1 will be described and the second sizing mill S will be described.
The same members of M2 are designated by the same reference numerals, and detailed description thereof will be omitted.

Each of the rolling rolls 16, 18, 20 arranged on the three rolling mills 10, 12, 14 constituting the first sizing mill SM1 has an axis of rotation with respect to another rolling roll adjacent thereto. The arrangement is such that they are displaced by 90 ° alternately. In the embodiment, the rolling rolls 16 and 20 arranged in the first rolling mill 10 on the upstream side in the feeding direction of the material to be rolled and the third rolling mill 14 on the downstream side are set to have horizontal axes, and the intermediate rolls are The axis of the rolling roll 18 arranged in the second rolling mill 12 is set to be vertical. Further, the rolling rolls 16, 18, of the three rolling mills 10, 12, 14 constituting the first sizing mill SM1
20 is configured to be driven by one drive motor 22 via a speed reducer 24.

The first sizing mill SM1 and the second sizing mill SM1
In the sizing mill SM2, the gear installed in the power transmission system
It is set so that two types of surface reduction rates can be selected depending on the speed difference caused by switching (not shown). For example, in the first sizing mill SM1, it is possible to select a surface reduction rate of 10% and 17%, and in the second sizing mill SM2,
Area reduction rates of 13.5% and 25.5% are selectable (see Fig. 3). In addition, each sizing mill SM1, SM2
Is configured so that it can be retracted from the pass line PL of the material to be rolled as required, and the first sizing mill SM1 or the second sizing mill SM2 can be used independently. And each sizing mill SM1, SM
By changing the combination of surface reduction rates selected in 2,
It is possible to manufacture a plurality of products, which will be described later, that are made into a series within the required cross-sectional dimension range without changing the size of the intermediate row.

[0011]

Next, the operation of the one-series rolling method according to this embodiment will be described. As shown in FIG. 2, the intermediate row in the hot rolling process is, for example, a hole type of 80φ-64φ-5.
It is set to 1.5φ and the cross-sectional dimension of the material to be rolled that has passed through the final rolling mill in the middle row is set to 51.5φ. Then, the material to be rolled having a cross-sectional dimension of 51.5φ is processed into a first sizing mill SM1 in which an appropriate surface reduction rate is selected.
Alternatively, the material to be rolled is rolled into the following eight sizes in the cross-sectional size range of approximately 40φ to 49φ by passing it through the second sizing mill SM2 alone or both sizing mills SM1 and SM2.

The area reduction rate of the first sizing mill SM1 is set to 1
By setting the value to 0% and performing finish rolling of the material to be rolled with the second sizing mill SM2 retracted from the pass line PL of the material to be rolled, as shown in FIG. The material to be rolled of 0.5φ is rolled to 48.8φ. By setting the area reduction rate of the first sizing mill SM1 to 17% and performing the finish rolling of the material to be rolled while the second sizing mill SM2 is retracted from the pass line PL of the material to be rolled, FIG. As shown in b), the material to be rolled having a cross-sectional dimension of 51.5φ is rolled to 46.9φ. By evacuating the first sizing mill SM1 from the pass line PL of the material to be rolled and performing the finish rolling of the material to be rolled with the surface reduction rate of the second sizing mill SM2 set to 13.5%, FIG. As shown in (c), the material to be rolled having a cross-sectional dimension of 51.5φ is rolled to 47.9φ. By evacuating the first sizing mill SM1 from the pass line PL of the material to be rolled and performing the finish rolling of the material to be rolled in a state where the area reduction rate of the second sizing mill SM2 is set to 25.5%, FIG. As shown in (d), the material to be rolled having a cross-sectional dimension of 51.5φ is rolled to 44.5φ. The area reduction rate of the first sizing mill SM1 is set to 10%, and the area reduction rate of the second sizing mill SM2 is set to 13.
By finishing rolling the material to be rolled in the state of being set to 5%, as shown in FIG. 3 (e), the cross-sectional dimension is 51.5φ.
The material to be rolled is rolled to 45.4φ. The area reduction rate of the first sizing mill SM1 is set to 10%, and the area reduction rate of the second sizing mill SM2 is set to 25.
By finishing rolling the material to be rolled in the state of being set to 5%, the cross-sectional dimension is 51.5φ as shown in FIG. 3 (f).
The material to be rolled is rolled to 42.1φ. The area reduction rate of the first sizing mill SM1 is set to 17%, and the area reduction rate of the second sizing mill SM2 is set to 13.
By performing finish rolling of the material to be rolled in the state of being set to 5%, as shown in FIG. 3 (g), the cross-sectional dimension is 51.5φ.
The material to be rolled is rolled to 43.7φ. The area reduction rate of the first sizing mill SM1 is set to 17%, and the area reduction rate of the second sizing mill SM2 is set to 25.
By finishing rolling the material to be rolled in the state of being set to 5%, as shown in FIG. 3 (h), the cross-sectional dimension is 51.5φ.
The material to be rolled is rolled to 40.5φ.

Further, as shown in FIG. 2, the material to be rolled having a cross-sectional dimension of 64φ in the intermediate row is finish-rolled in the above-mentioned patterns (1) to (4) to produce a product having a cross-sectional dimension of approximately 50φ to 62φ. Can be manufactured. Furthermore,
By subjecting the material to be rolled, which has a cross-sectional dimension of 80φ in the middle row, to finish rolling in the above-described patterns 1 to 3, products with cross-sectional dimensions of about 63φ to 78φ can be manufactured in one series.

As described above, the first sizing mill SM1 and the second sizing mill SM2 are selected and used, and
By changing the combination of surface reduction rates in each sizing mill SM1, SM2, the required cross-sectional dimension range (about 40φ
It is possible to manufacture a plurality of products in series of up to 78φ) without changing the size in the intermediate row. That is, since it is not necessary to change the roll size in the middle row, the actual work rate is improved and the roll unit is also improved. Further, by using the same middle row, the rolling quality can be stabilized. If the common drive system used in block mills, etc. is adopted as the drive system for the rolling mills in the middle row, eliminating large replacements in the middle row will greatly reduce roll unit and roll inventory management. Improvement is planned.

FIG. 4 shows another embodiment of the sizing mill. Sizing mills SM1 and SM2 equipped with two rolling mills 30 and 32 are connected in series along the pass line PL of the material to be rolled. The two sizing mills SM1 and SM2 are arranged and driven by one drive motor 34 via a speed reducer 36. Also in the sizing mills SM1 and SM2, two types of surface reduction rates can be selected by switching the gears interposed in the power transmission system, and only one of the sizing mills can be used alone. There is. In addition, the rolling rolls 38 and 40 arranged in the two rolling mills 30 and 32 have rotation axes alternately 90 ° with respect to another adjacent rolling roll.
The arrangement is deviated.

Therefore, by using the sizing mills SM1 and SM2 according to another embodiment shown in FIG. 4 to carry out finish rolling in the above patterns 1 to 3, a large size change of rolls in the intermediate row is performed as in the above-mentioned embodiment. It is possible to manufacture a plurality of products in series within the required cross-sectional dimension range without performing the above.

The arrangement of the rolls of each rolling mill in the sizing mill shown in FIG.
Various examples can be envisioned. For example, the axes of the rolls 16 and 20 of the first rolling mill 10 and the third rolling mill 14 may be vertical, and the axis of the roll 18 of the second rolling mill 12 may be horizontal. Further, each rolling mill of the sizing mill shown in FIGS. 1 and 4 can be driven by an independent drive motor. Further, the selectable surface reduction rate of each sizing mill is not limited to two types as in the embodiment, and three or more types of surface reduction rate may be set to be selectable.

[0018]

As described above, according to the one-series rolling method of the present invention, a plurality of products in series within the required cross-sectional dimension range can be manufactured without changing the size in the intermediate row. , The roll unit consumption can be improved and the roll inventory management can be reduced. In addition, the time required for a large size change and the inspection required after a large size change can be omitted,
There is an advantage that the actual work rate can be improved. Furthermore, since the intermediate row is not changed, the rolling quality can be stabilized.

[Brief description of drawings]

FIG. 1 is an explanatory plan view showing a schematic configuration of a sizing mill capable of suitably implementing a one-series rolling method according to the present invention.

FIG. 2 is an explanatory diagram showing a pass schedule performed using the sizing mill according to the embodiment.

FIG. 3 is an explanatory diagram showing finish rolling performed using the sizing mill according to the embodiment.

FIG. 4 is an explanatory plan view showing a schematic configuration of another sizing mill capable of suitably carrying out the one-series rolling method according to the present invention.

FIG. 5 is an explanatory diagram showing a pass schedule according to a method according to a conventional technique.

[Explanation of symbols]

 10 1st rolling mill 12 2nd rolling mill 14 3rd rolling mill 16,18,20 Rolling roll 30 Rolling mill 32 Rolling mill 38,40 Rolling roll SM1 1st sizing mill SM2 2nd sizing mill PL pass line

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshio Kato 42, 5 Omoteyama, Shirasawa, Akui-cho, Chita-gun, Aichi Prefecture (72) Inventor Tatsuya Ishihama 203, 1-11, Gokisho-dori, Showa-ku, Nagoya, Aichi

Claims (1)

[Claims] 1. A rolling method for performing finish rolling by passing a material to be rolled, which has been passed through an intermediate row of a rolling process and rolled to a required cross-sectional dimension, through a sizing mill having two or three units, wherein the material to be rolled is Along the pass line of the material, a first sizing mill and a second sizing mill that are configured to be able to select different reduction ratios are arranged in series, and the material to be rolled that is rolled to the required cross-sectional dimension in the intermediate row is At the time of finish rolling, either or both of the first and second sizing mills are used, and by changing the combination of the area reduction ratios that can be selected by each sizing mill and rolling, the required cross-sectional dimension range is reduced. A one-series rolling method characterized in that products are manufactured in series.