JP3287076B2 - One-series rolling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sizing mill for rolling a material to be rolled to a required cross-sectional dimension through an intermediate row of a rolling process and to select a plurality of different reduction rates. The present invention relates to a single-series rolling method in which a plurality of products serialized in a required size range are manufactured by passing the products.

[0002]

2. Description of the Related Art Generally, pass schedules of materials to be rolled such as steel bars and wires are roughly classified into coarse rows, intermediate rows, and finishing rows.
The 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. For this finish rolling, a sizing mill provided with a plurality of rolling mills is suitably used.

[0003]

In the case of manufacturing a plurality of products in a series in which the final cross-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 to the required cross-sectional dimensions by the coarse row is formed into a 72 mm hole shape.
By passing through the first intermediate row set at −57φ−46φ, the cross-sectional dimension is rolled to 46φ. Then, by passing this material to be rolled through a sizing mill SM provided with a rolling roll in which a first die is formed, a product having a final cross-sectional dimension of 40 to 42 φ is obtained.
In the first intermediate row, the material to be rolled to a cross-sectional dimension of 57φ is passed through a sizing mill SM replaced with a rolling roll having a second die, so that the final cross-sectional dimension is 50φ to 50φ. A product having a diameter of 53φ is obtained, and the material to be rolled having a cross-sectional dimension of 72φ is passed through a sizing mill SM replaced with a rolling roll having a third die, so that the final cross-sectional dimension is 63φ to 66φ.
Product is obtained.

Further, the intermediate row in the pass schedule is changed to a second intermediate row in which the hole shape is set to 77φ−62φ−49φ, and the material to be rolled to have a cross-sectional dimension of 49φ by the intermediate row, By passing through a sizing mill SM having rolling rolls in which the first to third molds are formed, the final cross-sectional dimension of the material to be rolled of 49φ is 43
A product having a final cross-sectional dimension of 54 to 57 φ is obtained from a material to be rolled of 62 φ,
A product having a final sectional size of 67φ to 72φ is obtained from the material to be rolled with φ. Further, a third row in which the hole shape is set to 80φ−64φ−53φ in the intermediate row in the pass schedule is used.
In place of the intermediate row, the material to be rolled, whose cross-sectional dimension is reduced to 53φ by the intermediate row, is passed through a sizing mill SM having rolling rolls in which the first to third molds are formed. Final cross-sectional dimension of 4 from rolled material
A product having a diameter of 7 to 49 φ is obtained, and a product having a final cross-sectional dimension of 58 to 62 φ is obtained from a material to be rolled of 64 φ.
A product having a final cross-sectional dimension of 73φ to 78φ can be obtained from the 0φ rolled material.

That is, when manufacturing a plurality of products serialized in a required sectional dimension range, as shown in FIG.
Like the A-sequence, the B-sequence, and the C-sequence, a large-scale change in which the intermediate row is rearranged for each sequence is required. In this case, there is a disadvantage that the time required for the large-scale replacement becomes long and the actual operation rate is reduced. After the large-scale change, inspection of the shape and dimensions of the material to be rolled in the intermediate row is required, and the loss time required for this inspection also causes a reduction in the working rate. Further, it is pointed out that the roll basic unit is reduced in the middle row and the roll inventory management becomes extremely complicated.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention has been proposed to solve the above problems, and an object of the present invention is to provide a one-line rolling method capable of improving the working rate and the basic unit of roll. And

[0007]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and appropriately attain the intended purpose, a single-series rolling method according to the present invention is characterized in that the rolling is performed to a required cross-sectional dimension through an intermediate row of a rolling process. In the rolling method of performing the finish rolling by passing the rolled material through two or three sizing mills, a plurality of different area reduction rates can be selected along the pass line of the rolled material. A first sizing mill and a second sizing mill are arranged in series, and when finish rolling the material to be rolled to the required cross-sectional dimensions in the intermediate row, one or both of the first and second sizing mills are used. It is used to manufacture products with the required cross-sectional dimension range in series by rolling while changing the combination of reduction ratios that can be selected in each sizing mill. To.

[0008]

Next, a 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 in a hot rolling process, in which two sizing mills SM1, SM2 are provided.
Are arranged, and the first sizing mill SM1 and the second sizing mill SM2 are each configured by three rolling mills 10, 12, and 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.
The same reference numerals are given to the same members of M2, and the detailed description is omitted.

[0009] Each of the rolling rolls 16, 18, and 20 provided in the three rolling mills 10, 12, and 14 constituting the first sizing mill SM1 has a rotating shaft center with respect to another adjacent rolling roll. The array is alternately shifted by 90 °. In the embodiment, the axes of the rolling rolls 16 and 20 disposed 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 be horizontal, and The axis of the rolling roll 18 provided in the second rolling mill 12 is set vertically. In addition, rolling rolls 16, 18, of three rolling mills 10, 12, 14 constituting the first sizing mill SM1.
20 is configured to be driven by a single 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 gears interposed in the power transmission system
The setting is made so that two types of reduction rates can be selected according to the speed difference caused by switching (not shown). For example, in the first sizing mill SM1, a reduction ratio of 10% and 17% can be selected, and in the second sizing mill SM2,
The area reduction rates of 13.5% and 25.5% can be selected (see FIG. 3). In addition, each sizing mill SM1, SM2
Is configured to be able to retreat from the pass line PL of the material to be rolled as necessary, and the first sizing mill SM1 or the second sizing mill SM2 can be used alone. And each sizing mill SM1, SM
By changing the combination of the reduction rate selected in 2,
A plurality of products in a series having a required cross-sectional dimension range described later can be manufactured without changing the middle row.

[0011]

Next, the operation of the one-series rolling method according to this embodiment will be described. The intermediate row in the hot rolling step is, for example, as shown in FIG.
It is set to 1.5φ so that the cross-sectional dimension of the material to be rolled after passing through the final rolling mill in the middle row becomes 51.5φ. Then, the material to be rolled having a cross-sectional dimension of 51.5φ is converted into a first sizing mill SM1 having an appropriate reduction ratio selected.
Alternatively, the material to be rolled is rolled to the following eight sizes having a cross-sectional dimension of about 40φ to 49φ by passing through the second sizing mill SM2 alone or through both the sizing mills SM1 and SM2.

The area reduction rate of the first sizing mill SM1 is 1
By performing the finish rolling of the material to be rolled while setting it to 0% and retracting the second sizing mill SM2 from the pass line PL of the material to be rolled, as shown in FIG. The .5φ rolled material is rolled to 48.8φ. By setting the area reduction rate of the first sizing mill SM1 to 17% and finishing rolling the material to be rolled in a state where 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 retracting the first sizing mill SM1 from the pass line PL of the material to be rolled, and performing finish rolling of the material to be rolled with the area 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 retracting the first sizing mill SM1 from the pass line PL of the material to be rolled, and performing 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 13.
By performing the finish rolling of the material to be rolled in a state of being set at 5%, as shown in FIG.
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 25.
By performing the finish rolling of the material to be rolled in a state of being set to 5%, as shown in FIG.
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 a state of being set to 5%, as shown in FIG.
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 performing the finish rolling of the material to be rolled in a state of being set at 5%, as shown in FIG.
Is rolled to 40.5φ.

As shown in FIG. 2, a material having a cross-sectional dimension of about 50 to 62 φ is subjected to finish rolling of the material to be rolled to a cross-sectional dimension of 64 φ in the intermediate row in the above-mentioned pattern (1). Can be manufactured. Furthermore,
By subjecting the material to be rolled, whose cross-sectional dimension is rolled to 80φ in the intermediate row, to finish rolling in the above-mentioned pattern, products having a cross-sectional dimension 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 selectively used and used.
By changing the combination of the area reduction rate in each of the sizing mills SM1 and SM2, the required sectional dimension range (about 40φ) can be obtained.
〜78φ) can be manufactured without large-scale replacement in the middle row. That is, since it is not necessary to change the size of the rolls in the middle row, the working rate is improved and the basic unit of rolls is improved. In addition, the use of the same intermediate row stabilizes the rolling quality. If a common drive system used in block mills and the like is adopted as the drive system for rolling mills in the middle row, eliminating large-scale replacement in the middle row will significantly reduce the unit consumption of rolls and inventory management of rolls. Improvement is achieved.

FIG. 4 shows another embodiment of a sizing mill. Sizing mills SM1 and SM2 each having two rolling mills 30 and 32 are connected in series along a pass line PL of a material to be rolled. In addition, the two sizing mills SM1 and SM2 are driven by a single drive motor 34 via a speed reducer 36. The sizing mills SM1 and SM2 are also configured so that two types of reduction rates can be selected by switching gears interposed in the power transmission system, and only one of the sizing mills can be used alone. I have. Further, each of the rolling rolls 38, 40 disposed in the two rolling mills 30, 32 has a rotation axis of 90 ° alternately with respect to another adjacent rolling roll.
The array is deviated.

Therefore, by performing finish rolling in the above-mentioned pattern using the sizing mills SM1 and SM2 according to another embodiment shown in FIG. 4, the large-scale change of the roll in the intermediate row is performed in the same manner as in the above-described embodiment. , A plurality of products serialized in the required cross-sectional dimension range can be manufactured in a single line.

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 area reduction rate of each sizing mill is not limited to two types as in the embodiment, and three or more types of area reduction rates may be set so as to be selectable.

[0018]

As described above, according to the single-series rolling method of the present invention, a plurality of products serialized in a required cross-sectional dimension range can be manufactured without large-scale replacement in an intermediate row. In addition, it is possible to improve the unit consumption of rolls and reduce the inventory management of rolls. In addition, the time required for large-scale replacement and the inspection required after large-scale replacement can be omitted,
There is an advantage that the working rate can be improved. Further, since the intermediate row is not changed, there is an effect that the rolling quality is stabilized.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view showing a schematic configuration of a sizing mill capable of suitably executing 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 a sizing mill according to an example.

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

FIG. 5 is an explanatory diagram showing a path schedule according to a method according to the related art.

[Explanation of symbols]

 DESCRIPTION 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

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshio Kato 5-42, Omotayama, Shirasawa-shi, Agui-cho, Chita-gun, Aichi Prefecture (56) References JP-A-1-210101 (JP, A) JP-A-60-191603 (JP, A) JP-B-47-33426 (JP, B1) (58) Fields investigated (Int. Cl. ⁷⁾ B21B 1/00-1/46 B21B 37/00-37/78

Claims (1)

(57) [Claims] 1. A rolling method for performing finish rolling by passing a material to be rolled to a required cross-sectional dimension through an intermediate row in a rolling process through a sizing mill having two or three rolls. Along the path line of the material, a first sizing mill and a second sizing mill configured so that a plurality of different reduction rates can be selected are arranged in series, and the material to be rolled to the required cross-sectional dimension in the intermediate row is arranged. In finish rolling, one or both of the first and second sizing mills are used, and rolling is performed by changing a combination of reduction ratios that can be selected in each sizing mill. A one-series rolling method, wherein products are manufactured in series.