JP3066277B2 - Split rolling method for steel bars - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oval hole forming process in a series of rolling processes for split rolling a plurality of round bars and deformed bars (hereinafter referred to as "bars") from one rolled material. To improve the process of rolling a rolled material using a rolling mill of the shape of a flower, a flower-shaped hole (or a cherry-shaped hole), and a rolling machine of a peanut-shaped hole to roll a rolled material having high dimensional accuracy. And a method for split rolling.

[0002]

2. Description of the Related Art Japanese Unexamined Utility Model Publication No. Hei 6-54405 discloses that an oval rolled material rolled by an oval hole rolling mill is rolled into a flower shape by a subsequent flower hole horizontal rolling mill. Rolled to 45 ° (twisted)
A rolling method is disclosed in which a peanut-hole-shaped horizontal rolling mill at a later stage rolls into a peanut shape, divides the peanut-shaped rolled material, and rolls a plurality of steel bars.
According to this conventional technique, when the flower-shaped rolled material in the rolling step is twisted by 45 ° and guided to a peanut hole-shaped rolling mill, the rolled material is formed into a convex shape so as to follow the shape of the flower-shaped concave portion. An inlet guide device having a formed horizontal roller and a vertical roller is provided, and a configuration in which a flower-shaped rolled material is accurately guided to a peanut hole-shaped rolling mill by the inlet guide device is employed. As an example of this prior art rolling mill arrangement, this rolling mill arrangement has an oval hole shape 11a arranged in a series of split rolling steps as shown in FIG.
Rolling mill 11; a horizontal rolling mill 12 having a flower-shaped hole 12a disposed downstream of the rolling mill; and a horizontal rolling mill 13 having a peanut-shaped hole 13a disposed downstream of the rolling hole-shaped rolling mill. Consists of In this rolling mill arrangement, the oval-shaped rolled material rolled by the oval-hole-type rolling mill 11 is twisted by 90 ° as shown by the arrow in FIG.
°), is guided to the subsequent flower-shaped hole rolling mill 12, where it is rolled and rolled into a flower-shaped rolled material M1, and the portion corresponding to the petals of the rolled material M is rolled so as to cross 90 ° (corresponding to 90 °). The portion corresponding to the petal (projection) is rolled so as to face up and down or left and right in FIG. 2), and then the flower-shaped rolled material M1 is twisted by 45 ° (turning angle 45 °) to form a peanut hole rolling mill. At 13, rolling is performed in a peanut shape.

[0003]

In the process of dividing one rolled material in a rolling process and rolling it into a plurality of steel bar products,
What is important when the flower-shaped rolled material M1 is rolled by the subsequent peanut hole-shaped rolling mill is that the flower-shaped rolled material rolled by the former flower-shaped hole-shaped rolling mill is accurately twisted by 45 ° and the latter stage. It is necessary to guide the peanut hole-shaped rolling mill. This is because if the flower-shaped rolled material is not accurately guided, the rolled material may not be rolled by the peanut-hole-shaped rolling mill so that the left and right shapes of the rolled material are equal to each other. That is, for example, in the case of split rolling to two left and right rolled steel bars, if the rolling accuracy of the left and right rolled materials is not uniform, the accuracy of the left and right products varies, and one of the rolled materials becomes the other rolled material. Problems such as the rolling being thicker than the material appear, so it is important to equalize the rolling accuracy in the split rolling. Therefore, in the entrance guide device of the prior art, in order to be able to accurately twist the flower-shaped rolled material rolled by the former rolling mill by 45 ° and accurately guide it to the peanut hole shape of the latter rolling mill, An inlet guide device is provided, and a guide roller having a convex hole shape is vertically and horizontally combined in accordance with the shape of the concave portion of the rolled material, so that the rolled material is embraced from four directions, vertically and horizontally. However, in this conventional technique, it is necessary to dispose the entrance guide device at a position where the twisting of the flower-shaped rolled material is completed, so that the former flower-shaped hole rolling mill and the latter stage required for the twisting of the rolled material are required. In this case, the distance between the stand and the peanut hole-type rolling mill becomes long, which causes a problem that the space efficiency of the factory is reduced. Conversely, if the entrance guide device is arranged at a position where the torsion is not completely completed, and the rolled material is to be guided, the flower-shaped rolled material is twisted into the hole shape of the guide roller and enters. ,
Problems such as a reduction in dimensional accuracy by deforming the flower shape of the rolled material occur. As long as the technique of twisting the flower-shaped rolled material by 45 ° as in this conventional technique is used, there is a problem that it is difficult to accurately guide the flower-shaped rolled material to the hole shape of the subsequent peanut hole-shaped rolling mill. is there. From the above, the object of the present invention is to be able to effectively use the factory space,
An object of the present invention is to accurately guide a flower-shaped rolled material to a subsequent peanut-hole-shaped rolling mill without lowering dimensional accuracy by deforming the flower shape of the rolled material.

[0004]

According to the split rolling method of the present invention, in order to accurately guide the flower-shaped rolled material to the subsequent peanut-hole-shaped rolling mill, the flower-shaped rolled material is not twisted without being twisted. Focused on guiding to a peanut hole-shaped rolling mill. The split rolling method according to the present invention is characterized in that an oval rolled material rolled by an oval hole rolling mill is twisted by 45 ° and then provided with a flower-shaped hole provided at a subsequent stage of the oval hole rolling mill. Rolls are rolled in a roll with an inclined roll at which the axis of the roll is inclined at 45 °, and the flower-shaped hole-shaped rolled material is rolled.
Next, without rolling the flower-shaped rolled material, the rolled material is rolled into a peanut shape by a peanut-hole-shaped rolling mill provided at the subsequent stage of the flower-shaped hole-shaped rolling machine, and thereafter, the peanut-shaped rolled material is rolled. A plurality of rolled materials are rolled by dividing. The split rolling method of the present invention is a horizontal rolling mill having an oval hole shape, and an inclined rolling mill having a flower-shaped hole shape that is arranged downstream of the rolling mill and the axis of a rolling roll is inclined by 45 °. A series of rolling steps including a step of dividing a rolled material rolled by the peanut-hole-shaped rolling mill using a horizontal rolling mill having a peanut-hole shape and disposed downstream of the flower-shaped-hole rolling mill. Is a method of rolling a plurality of steel bars, and rolling the rolled material into an oval shape by the oval hole rolling mill, and then twisting the oval shape rolled material by 45 °, the inclined rolling of the flower hole shape After being guided to a mill and rolling into a flower shape there, the rolled material in the shape of a flower is guided to the above-mentioned peanut hole horizontal rolling machine without being twisted and rolled into a peanut shape there.

[0005]

The oval rolled material rolled by the oval hole rolling mill is twisted by 45 °, and then the shaft of the flower-shaped hole rolling roll disposed at the latter stage of the oval hole rolling machine is rotated by 45 °. Rolled on an inclined rolling mill. In the rolled material rolled by the 45 ° inclined flower-shaped hole rolling mill, the portion corresponding to the flower-shaped hole petals is rolled at an angle of 45 °. Since the rolled material rolled by the horizontal rolling mill in the shape becomes the same as the state in which the rolled material has been twisted by 45 °, the flower-shaped rolled material can be guided to the subsequent peanut hole-shaped rolling mill without being twisted. Therefore, it is possible to accurately guide the flower-shaped rolled material to the peanut-hole-shaped rolling mill, and to obtain a peanut-shaped rolled material whose left and right shapes are equal to each other.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the split rolling method of the present invention will be described with reference to FIG. In the split rolling method of this embodiment, a horizontal rolling mill 1 having an oval hole type 1a disposed in a series of split rolling steps, and a shaft of a rolling roll disposed at a subsequent stage of the oval hole rolling mill. , A rolling mill 2 having a flower-shaped hole 2a having a flower shape inclined at 45 °, and a horizontal rolling mill 3 having a flower-shaped hole 3a disposed downstream of the flower-shaped hole rolling mill 3
And an array of rolling mills comprising: Then, as shown by the arrow in FIG. 1, the split rolling method twists the rolled material rolled into the oval shape by the oval hole rolling mill 1 by 45 ° (rotation angle 45 °), and the subsequent flower-shaped hole rolling mill 2 , And the portions corresponding to the petals of the flower-shaped rolled material M are rolled so as to intersect at 45 ° (the portions corresponding to the petals are rolled so as to face each other at an oblique angle of 45 ° in FIG. 1). Then, the flower-shaped rolled material is guided to the peanut hole shape 3a of the subsequent rolling mill 3 without twisting (torsion angle 0 °), and is rolled into a peanut shape there. The peanut-shaped rolled material is divided and rolled into a plurality of steel bars.

[0007] In the rolling method of the present invention, by rolling the rolling rolls of the flower-shaped hole rolling machine 2 at a 45 ° inclination, the flower-shaped rolled material is twisted to the subsequent peanut hole-shaped rolling mill 3. Since it is a method of guiding without rolling, the unstable rolling process of twisting the flower-shaped rolled material by 45 ° and guiding it to the subsequent peanut hole-shaped rolling mill as in the prior art is eliminated, and the peanut-shaped rolled material is removed. It is possible to improve the precision of rolling, and it is not necessary to twist the flower-shaped rolled material. Space can be used effectively.

[0008]

According to the present invention, it is possible to eliminate the process of twisting and rolling a flower-shaped rolled material, which is difficult to twist 45 ° and accurately guide to a subsequent peanut hole-shaped rolling mill. It is possible to accurately guide the material to the subsequent peanut-hole-type rolling mill, and to obtain the effect of improving the dimensional accuracy of the bar steel product to be divided and rolled.In addition, it is not necessary to twist the flower-shaped rolled material. By arranging the stand-to-stand distance to the peanut-hole-type rolling mill short, the effect of effectively using the space of the rolling mill can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a hole shape corresponding to a process of a main part showing a stepwise rolling method according to the present invention.

FIG. 2 is a view showing a hole shape corresponding to a process of a main part showing stepwise a conventional split rolling method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oval hole horizontal rolling machine 1a Oval hole shape 2 Flower hole inclined rolling mill 2a Flower hole shape 3 Peanut hole horizontal rolling machine 3a Peanut hole M rolling material

Claims (3)

(57) [Claims] A rolled material is rolled into an oval shape by an oval hole rolling mill, and the rolled material having an oval shape is rolled.
5 ° torsion, rolled into a flower shape by a flower-shaped hole inclined rolling mill arranged downstream of the oval hole-shaped rolling mill and having a roll roll axis inclined by 45 °, and then formed into a flower-shaped shape. The rolled material is guided to a peanut hole-shaped rolling mill that is arranged downstream of the inclined rolling mill as it is without twisting, and is rolled into a peanut shape there, further dividing the peanut-shaped rolled material. Rolling method of steel bar. 2. A rolling mill having an oval hole shape, an inclined rolling mill arranged downstream of the rolling mill and having a flower hole shape in which the axis of a rolling roll is inclined by 45 °, and a flower hole shape. Using a rolling mill having a peanut hole shape arranged downstream of the rolling mill, a plurality of steel bars in a series of rolling steps including a step of dividing the rolled material rolled by this peanut hole shape rolling mill In the method of rolling, the rolled material is rolled by the above-mentioned oval hole rolling mill, and then the oval-shaped rolled material is twisted by 45 °, guided to the above-mentioned flower-shaped hole inclined rolling mill, and rolled into a flower-shaped shape there. After doing
A method of split rolling a steel bar, comprising guiding the rolled material having a flower shape to the above-mentioned peanut hole-shaped rolling mill without twisting and rolling the material into a peanut shape there. 3. A horizontal rolling mill having an oval hole shape, and a rolling roll shaft disposed downstream of the rolling mill and having a shaft of 45 mm.
Using an inclined rolling mill having a flower-shaped hole inclined and a horizontal rolling machine having a peanut-shaped hole arranged downstream of the flower-shaped inclined rolling mill, the peanut-shaped rolling mill In a method of rolling a plurality of steel bars in a series of rolling steps including a step of dividing the rolled material rolled in the above, the rolled material is rolled into an oval shape by the above oval hole rolling mill, and then the oval shape rolled material is rolled. Is twisted at 45 ° and guided to the above-mentioned flower-shaped hole inclined rolling mill, where it is rolled into a flower shape, and then the flower-shaped rolled material is guided to the above-mentioned peanut-shaped horizontal rolling mill without twisting. And then rolling the bar into a peanut shape.