JP3024411B2 - Brush roll and method of descaling steel material using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush roll for cleaning the surface of various articles, particularly for removing scale (descaling) from the surface of a metal material, and a method for descaling a metal material using the same. .

[0002]

2. Description of the Related Art As a tool for mechanically removing deposits on the surface of an article, there is a so-called brush roll in which a brush is planted around the tip of a rotating shaft. Usually, a brush roll is manually pressed against a predetermined article surface to clean the surface, but it is difficult to efficiently clean a large surface by such a method.

In the industrial field dealing with metal materials, it is often necessary to efficiently treat large surfaces, such as descaling of steel sheet surfaces. In the rolling process of steel mills, continuous production of lines has been promoted mainly for the purpose of improving yield and productivity. In such a case, however, the surface of hot steel (hot steel) can be quickly removed. A technique for descaling and pressing is required.

Although a certain amount of descaling can be performed by simply rotating a brush, it is not enough to remove the adhered scale. In the descaling of hot steel materials, it is necessary to take measures to protect the brush from wear due to heat and to re-oxidize the steel material after descaling.Surface cleaning devices that take such points into consideration have been developed. Not.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus capable of efficiently cleaning the surface of an article, particularly an apparatus capable of rapidly and effectively descaling a metal material. The present invention provides a method for descaling a steel material, particularly, a hot steel material using the same.

[0006]

The gist of the present invention is the following brush roll (1) and the descaling method (2) or (3).

(1) a rotating shaft having a gas supply passage therein;
A brush attached to the outer periphery of one end of the brush, a gas injection hole branching from the gas supply path and opening to a mounting base of the brush, a mechanism for moving the rotation axis in a horizontal direction and a vertical direction, and the rotation A brush roll having a mechanism for rotating a shaft.

(2) A method of descaling a metal material using the brush roll of the above (1), wherein the brush is applied to the descaling surface of the metal material and ground while rotating the rotating shaft. A descaling method characterized by using both work and injection of gas from the gas injection holes.

(3) The metal material is a hot steel material, the brush is a wire brush, and the gas to be injected is a non-oxidizing gas.
The descaling method of (2).

[0010]

First, the structure and operation of the brush roll of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an example of the brush roll of the present invention. In the drawing, reference numeral 1 denotes a brush, which is attached to the outer periphery of one end of the rotating shaft 2. A gas supply path 3 is provided inside the rotary shaft 2, and further, a gas ejection hole 4 branched from the supply path and opening to a brush mounting base as shown in FIG. 2 described later.

The rotating shaft 2 is held by a chock 6 via a bearing 5, and the chock 6 can be moved vertically (up and down) by a gear 7 and a spline shaft 8 which moves up and down by its rotation. I have. Reference numeral 9 denotes a frame supporting these mechanisms.

The other end of the rotating shaft 2 is a rotary joint
It is rotatably supported by 10 and a gas supply pipe 11 is connected. Further, for example, a pulley 12 is attached, and a rotational driving force is transmitted by a V-belt from an electric motor (not shown).

The above-mentioned frame 9 and rotary joint
10 is set on a trolley 13.

Therefore, the entire apparatus can be moved in the horizontal direction. In FIG. 1, the truck runs on rails 14, but this rail is not essential, and the wheels of the truck can be caster-structured so that they can move back and forth and left and right on a plane. .

When using the brush roll of the present invention having the above-mentioned structure, the carriage is first moved to a position where an object whose surface is to be cleaned, for example, a steel plate to be descaled, is placed. Determine the position. Next, the gear 7 is rotated by appropriate means, the spline shaft 8 is rotated to move the chock 6 up and down, and the vertical position of the rotating shaft 2 is determined so that the brush hits a predetermined position on the surface of the steel plate. Thereafter, the rotary shaft 2 is rotated to perform surface grinding. Before, after, or at any time during rotation, an arbitrary gas such as air, an inert gas, or a reducing gas is supplied from the gas supply path 3 to generate a gas. It is ejected from the ejection hole 4 to enhance the effect of grinding and cleaning, or to cool the brush.

The gas supply amount and the injection pressure may be determined according to the purpose of use of the gas.

FIGS. 2, 3 and 4 are enlarged views showing several examples of a method of attaching a brush to one end of a rotating shaft. FIG. 1 shows a rotary shaft 2 in which a brush 1 is radially implanted directly, and a gas ejection hole 4 is opened between the brushes.

FIG. 3 shows a donut-shaped disk 21 on which a brush is radially planted as shown in FIG.
In this case, the ejection hole 4 is provided in a portion where the disk 21 of the rotating shaft does not hit. 22 is a stopper and 23 is a spacer.
FIG. 1 shows a brush roll of this type.

FIG. 4 shows a structure in which a cylinder 24 having a large number of brushes shown in FIG.
An air hole 25 is provided in the cylinder 24 itself so as to avoid the portion where the brush is implanted. The cylinder 24 is positioned by the stopper 22 so that the air hole 25 communicates with the ejection hole 4 of the rotating shaft.

With the structure shown in FIGS. 3 and 4, when the brush is worn, it can be updated simply by replacing the disk or cylinder.

The material of the brush may be selected according to the purpose of use of the apparatus, but a wire brush is used for the purpose of descaling a metal plate. In particular, when descaling a hot steel material, it is desirable that the brush is made of a heat-resistant material such as stainless steel.

Next, descaling of a hot steel material will be described as an example of use of the above brush roll.

In the conventional hot rolling of a steel sheet, the heated slabs are supplied one by one to a rough rolling mill and a finishing rolling mill, and intermittently rolled. In such intermittent rolling, particularly when manufacturing a thin steel plate, the leading end of the steel plate may hit the guide roll, or the rear end of the steel plate may be narrowed when passing through the rolling mill, and the roll may be damaged. Many.

When these troubles occur, it is necessary to stop the rolling line or replace the roll. In order to prevent such troubles, the rolling speed must be reduced to reduce the efficiency of the rolling process.
Further, at the leading end and the trailing end of the hot-rolled steel sheet, the rolling speed balance is disturbed as compared with the central part thereof, and the hot-rolled steel sheet is out of an appropriate rolling temperature range. Furthermore, at the end of the hot-rolled steel sheet, the central part in the sheet width direction protrudes in the rolling direction and the sheet width becomes narrower, or due to a sudden increase in tension at the start of biting by the rolling roll or at the start of winding by the down coiler. The board width becomes narrow. As described above, the leading end and the trailing end of the hot-rolled steel sheet less than the specified size of the product must be cut off, and the product yield is greatly reduced.

In order to eliminate the above-mentioned problems, a method of joining a preceding hot-rolled steel sheet and a succeeding hot-rolled steel sheet between a rough rolling mill and a finishing rolling mill in recent years and continuously performing finish rolling has been proposed. Proposed. The simplest method of joining at this time is to weld the ends of the steel sheets by overlapping or abutting each other, but in order to obtain sufficient joining strength, remove the oxide film (scale) at the joint as much as possible. Need to do.

There are various methods for descaling the steel material, but the method using a brush roll with a wire brush is the simplest and practical. However, if a normal brush roll is used for descaling a hot steel material (normally 500 to 1100 ° C.) in the hot rolling process as described above, it is inefficient and the brush is worn by heat. Is intense.

According to the brush roll of the present invention, not only can the descaling operation be performed quickly, but also the grinding can be performed while cooling gas is being injected from the gas injection holes, so that the brush is prevented from being worn. , The service life is significantly prolonged. If a non-oxidizing gas (nitrogen gas, carbon dioxide gas, or the like) is used as the gas to be injected, reoxidation of the descaled surface can be prevented. If a reducing gas such as hydrogen or carbon monoxide is used, this reduces the scale,
The descaling efficiency becomes higher. In some cases, the joining portion may be kept warm or heated using a reducing flame to bring the steel material to a temperature at which it can be pressed or to promote the reduction of the scale. The roll is fully usable.

FIG. 5 is a view conceptually showing a method of descaling a hot steel material on a rolling line using the brush roll of the present invention and immediately pressing it. In the figure, 31 and 32 are steel materials after passing through a rough rolling mill, 31 is a preceding rolled material, and 32 is a subsequent rolled material. Reference numeral 33 denotes an auxiliary heating burner for heating the joint with a reducing flame.

In the method shown in FIG.
Is pushed up by an appropriate means, and only the width for performing the descaling of the front end portion and the rear end portion of the preceding rolled material 31 is overlapped with a gap up and down. The end of the brush roll is inserted into this gap from the side, and both surfaces to be joined are simultaneously ground as shown in the figure to perform descaling. Thereafter, the brush roll is released, and pressed in a vertical direction by a press mold 34 to perform pressure contact.

When butt joining is performed, the positions of the rolled material and the brush roll are adjusted so that the brush contacts both the rear end of the preceding rolled material and the front end of the succeeding rolled material. After descaling, both steel materials are gripped by an appropriate jig and pressed in the longitudinal direction to perform pressure welding.

The position of the brush roll in the plate width direction is the above-mentioned carriage.
Adjustable with 13 moves. Up and down adjustment can be performed by raising and lowering the chock 6 as described above. At this time, even if the length of the brush attachment portion is less than the entire length of the plate width, the carriage 13 may be moved to move the rotary shaft 2 in the plate width direction during descaling. Can be descaled.

As described above, descaling at the time of joining hot steel materials has been described as the most effective use example of the brush roll of the present invention. However, the brush roll of the present invention can be used not only for such special applications, but also for general surface cleaning of metal materials and the like utilizing the synergistic grinding and cleaning effects of a rotating brush and jetting gas. It can also be used for conversion.

[0034]

EXAMPLE A steel sheet (C: 0.1%, Si: 0.5%, Mn: 1.2%) having a thickness of 15 mm, a width of 300 mm and a length of 500 mm was used as a test material, and the brush roll of the present invention was used. The descaling was carried out in the manner as shown, and the ends 25 mm were overlapped and pressed. The conditions are as follows.

Structure of Brush Roll The structure shown in FIG. 1 is such that the brush has a wire diameter of 0.8 mm and the material is SUS31.
6, wire brush.

The outer diameter of the rotating shaft 2 is 60 mm, and a brush is attached to a tip of 30 mm. The gas injection hole should be 1mm in diameter 12
(4 in the circumferential direction at 90 ° intervals, 3 rows in the axial direction at 8 mm intervals).

Descaling condition Brush roll rotation speed: 600 rpm Brush roll supply gas: Nitrogen gas (pressure 3 kg / cm ² , flow rate 30 liter / min at rotary joint) Heating condition of pressure contact part Burner of mixing method in nozzle ( Using 33) in FIG. 5, an air-fuel mixture was blown out from a ring-shaped slit nozzle to form a flame. Fuel is C gas (coke oven gas) at 20 Nm ³ / Hr,
m (air-fuel ratio) 0.5 and oxygen concentration 50%.

The test piece was heated to a temperature of 1000 ° C. (during pressing).

Pressing condition The mold 34 shown in FIG.
/ cm ² . The test was performed four times.

Evaluation A microscopic observation (magnification: 500) of the cross section of the joint was conducted to examine the presence or absence of inclusions at the joint interface. As a result, there was no inclusion due to scale. Furthermore, a tensile test specimen centered on the joint was taken and subjected to a cold tensile test. As a result, all four specimens fractured not at the joint but at the base metal part, and sufficient strength of the joint was confirmed. .

[0041]

The brush roll of the present invention is used for cleaning the surface of all articles, including descaling of metallic materials, and contributes to the improvement of work efficiency. In particular, when descaling hot steel on a hot rolling line, the descaling can be performed efficiently by installing the apparatus at a predetermined position,
In addition, the brush has a long life and is extremely practical.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a brush roll of the present invention.

FIG. 2 is a diagram illustrating an example of brush attachment of the brush roll of the present invention.

FIG. 3 is a view for explaining another example of mounting the brush of the brush roll of the present invention.

FIG. 4 is a view for explaining another example of brush attachment of the brush roll of the present invention.

FIG. 5 is a schematic view showing a mode in which a hot steel material is pressed by using the descaling method of the present invention.

[Explanation of symbols]

1: brush, 2: rotating shaft, 3: gas supply path, 4:
Gas injection hole, 5: bearing, 6: chock, 7: gear,
8: Spline shaft, 9: Frame, 10: Rotary joint, 11: Gas supply pipe, 12: Pulley, 13:
Dolly, 14: Rail, 21: Disk, 22: Stopper,
23: Spacer, 24: Cylindrical, 25: Vent, 31: Pre-rolled material, 32: Subsequent rolled material, 33: Burner, 34: Press-welding die

Claims (3)

(57) [Claims] A rotating shaft having a gas supply passage therein; a brush attached to an outer periphery of one end of the rotation shaft; a gas injection hole branched from the gas supply passage and opened to a mounting base of the brush; A brush roll having a mechanism for moving a rotation axis in a horizontal direction and a vertical direction, and a mechanism for rotating the rotation axis. 2. A method for descaling a metal material using the brush roll according to claim 1, wherein the brush is applied to a descaling surface of the metal material while rotating the rotating shaft, and grinding is performed. A descaling method, wherein the method is used in combination with the gas injection from the gas injection holes. 3. The metal material is a hot steel material, the brush is a wire brush, and the gas to be injected is a non-oxidizing gas.
Descaling method.