JPH0337769Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotating brush for descaling red-hot steel materials in a rolling process.

Prior Art and its Problems When hot rolling a steel material, when the steel material is heated to a high temperature in a heating furnace, a large amount of scale is generated on the surface of the steel material due to the oxidizing atmosphere inside the heating furnace. This scale accelerates the wear of the rolling rolls and causes scale defects on the product surface, reducing the product value.

For this reason, conventionally, a high-pressure water injection method has been used in which a high-pressure descaling header sprays high-pressure water onto the surface of the red-hot steel material before the rolling rolls to blow away the scale of the red-hot steel material.
According to this method, the scale that is firmly attached to the surface of red-hot steel is removed by spraying high-pressure jet water, so it consumes a large amount of electricity to drive the pump that increases the water pressure. It had problems with large water consumption for injection. In addition, in order to inject a large amount of water onto the surface of the red-hot steel material, the red-hot steel material to be subjected to rolling must be cooled and its temperature lowered. Therefore, the red-hot steel material used for rolling must be heated in the heating furnace to compensate for the temperature drop. It is necessary to keep
The cumulative energy loss was extremely large. Furthermore, the scale cannot be completely removed by spraying the high-pressure water only, and it is insufficient as a means for preventing scale defects on the surface of the product.

In order to solve the above problems, the inventors have recently developed a brush descaling method in which a rotating brush is applied to the surface of a red-hot steel material to descale it. According to this brush descaling method, the problems of heat loss and water consumption of the above-mentioned high-pressure water injection method can be solved all at once.
The equipment cost is low and it is highly economical, but when a thin single steel wire is generally used as the brush material and applied to the surface of the high-temperature steel material that is the object of this invention, it also becomes thermally embrittled and becomes stiff. As a result, as shown in FIG. 1, the tip 2a of the single wire 2 acting on the surface of the red-hot steel material 1 is uniformly bent in the direction opposite to the rotating direction P of the rotating brush, resulting in a bend 2a' in a short time. As a result, the diameter of the rotating brush with the bend 2a' becomes smaller by h than the diameter of the rotating brush before the bend 2a' occurs, and the descaling ability is reduced for a short time. Therefore, the rotary brush had to be replaced frequently with a new one, which caused a major problem in that it could not be put to practical use at all in terms of profitability.

Therefore, the present invention was devised to solve the problems of each of the conventional methods mentioned above and put the brush descaling method into practical use.While taking advantage of the advantages of the descaling method using the rotating brush, it also solves the problems of the brush descaling method. It is an object of the present invention to provide a rotating brush with a long life and a high descaling effect, which can effectively eliminate the above-mentioned practical drawbacks and accurately accomplish the purpose of descaling red-hot steel materials.

Means to Solve the Problems This invention is a means to solve the above problems by using multiple thin steel wires with a thickness of 1 to 3 mm, each having a thickness of 0.2 to 0.5 mm.
Forms a corrugated stranded wire with a thickness of 0.3 to 0.7 mm.
A corrugated single wire is formed from thick steel wire, a rotating brush is formed from a mixture of the corrugated single wire and the corrugated stranded wire, and the tip of the corrugated stranded wire is twisted back to the outer layer of the rotating brush. The cleaning section is configured to descale red-hot steel by forming a cleaning section consisting of a set of untwisted single wires of thin steel wires with a corrugated twist pattern and a single wire of thick corrugated steel wires.

Function: When the rotating brush having the above configuration is used for descaling red-hot steel, the untwisting induces subsequent descaling, resulting in a collection of corrugated single wires made of strong, thick steel wires, and an excellent cleaning effect. A set of untwisted single wires with a wave-shaped twist made of thin steel wires exhibits their respective characteristics and acts synergistically on the surface of the red-hot steel material, producing a high descaling effect as shown in the experimental results described below. Ta. This effectively solved the problems of the conventional brush descaling method, such as the surface of the rotating brush becoming mirror-finished, the steel wire sitting loose, and the resulting short-term loss of descaling ability.

Embodiment Hereinafter, the structure of the present invention will be explained based on FIGS. 2 to 10 showing one embodiment.

FIG. 2 is a side view showing an outline of a rolling line in which the rotating brush according to the present invention is implemented, in which 3 is a table roller that transfers the red-hot steel material 1 toward the rolling roll 4, and 5 is the back of the rolling roll 4. It's Atsprole. Reference numeral 7 denotes a descaling rotary brush that slides into contact with the surface of the red-hot steel material 1 by means of an air cylinder 8 while rotating at high speed in a direction opposite to the direction in which the red-hot steel material 1 is transported.
consists of the following structure.

As shown in Figure 3A, multiple thin stainless steel wires 9 (Φ0.2~0.5mm) are twisted together so as to wrap around each other as shown in Figure _3A1 , and then twisted into a wave shape. A single corrugated stranded wire 10 is formed by curve forming.

On the other hand, as shown in Fig. 3B, a steel wire 9' (Φ0.3 to 0.7 mm) which is thicker than the thin steel wire 9 is formed into a corrugated shape as shown in Fig. _3B1 , and a corrugated solid wire 10' is formed. Form. The corrugated solid wire 10' and the corrugated twisted wire 10
Mixed wire 11 (mixing ratio is 30
40%, and 60 to 70% corrugated solid wire 10') is used as the brush material to construct the above-mentioned rotating brush such as a channel-type brush roll or a disk-type brush.

As is known, a channel-shaped brush roll is formed by sandwiching the base of a brush material between U-shaped channels and tightly winding this channel around the circumferential surface of the roll, and a disc-shaped brush roll is formed by sandwiching the base of a brush material with a U-shaped channel and tightly winding this channel around the circumference of the roll. It is formed by inserting a bundle of brush materials into a number of holes formed on the periphery and planting them radially, and then inserting a large number of these disks into a roll.

As shown in FIG. 4, the corrugated stranded wires 10 of the brush material are untwisted at their tips, and by this untwisting, the corrugated untwisted single wires 12 are assembled in the outer layer of the rotating brush. A cleaning section 13 is formed by a set of the corrugated single wires 10'.

The rotary brush 7 thus formed is descaled by pressing down on the surface of the red-hot steel material 1 while rotating the abrasive section 13 at high speed in a direction opposite to the moving direction of the red-hot steel material 1.

The corrugated stranded wire 10 and the corrugated solid wire 10', which are unit materials constituting the rotating brush 7, may be formed of a collection of steel wires with a circular cross section as shown in FIG. 5, or as shown in FIG. It is formed from a mixed assembly of steel wires with a circular cross section and steel wires with a square cross section.

Descaling rate, reduction rate of brush diameter, and linear scratch pattern occurrence rate on red-hot steel material between the rotating brush 7 of the present invention configured with the above-mentioned mixed wire 11 as a brush material and the conventional rotating brush configured with only a single wire as a unit material The results of the investigation are shown in Figures 8 to 10. In the mixed wire 11 of the present invention used as this experimental sample, the thickness of the steel wire 9 forming the corrugated stranded wire 10 was Φ0.25 mm, and the thickness of the steel wire 9' forming the corrugated single wire 10' was Φ0. It is 6mm.

Figure 8 shows the mixed line 1 of the present invention at descale.
1 and when using a conventional single wire, the descaling rate according to the diameter is shown. The ○ marks indicate the data when the mixing wire 11 of the present invention was applied to the surface of the same red-hot steel material to descale it. According to this figure 8, when using conventional single wire, 100% of
However, within the range of 1.0 to 3.0 mm, the descaling rate decreases rapidly, reaching 3.0 mm. Within the range of ~5.0 mm, the descaling rate remains almost the same.

On the other hand, in the case of the mixed wire of the present invention, the thickness of the corrugated stranded wire 10 is uniform within the range of 1.0 to 5.0 mm.
This shows that a descaling rate close to 100% can be obtained. For this reason, when a conventional single wire is made into a steel wire with a thickness that makes it hard to bend, the descaling rate decreases significantly, whereas when using the mixed wire of the present invention, the descaling rate decreases even if the wire is considerably thick. In order to be able to maintain a high level of descaling rate and to improve the descaling rate, a mixed wire 11 using a corrugated stranded wire with a thickness of 1.0 to 5.0 mm and a steel wire in the range of 0.2 to 1.0 mm is used. It can also be seen that it is ideal if .

Furthermore, FIG. 9 shows the results of investigating the performance from the relationship between the diameter of the mixing wire 11 according to the present invention, the diameter of the conventional single wire, and the reduction rate of the rotating brush diameter during descaling. The case is shown, and the circle mark indicates the case of the mixed line 11 of the present invention. According to Fig. 9, in the case of the x mark, the rate of decrease in the rotating brush diameter decreases rapidly as the diameter becomes thicker within the range of 0.2 to 2.0 mm, and approximately within the range of 2.0 to 5.0 mm. Although the diameter of the rotating brush remains at the same low rate of decrease and no reduction in the diameter of the rotating brush is observed, the descaling rate decreases significantly as shown in FIG. 8 in the range of the diameter of the single wire mentioned above, making it impossible to put it to practical use.

On the other hand, in the case of ○ mark, 2.0mm of the above × mark
It is shown that the rate of decrease is almost the same as in the above case, and in addition, the high descaling rate explained in FIG. 8 is obtained. Therefore, by performing descaling with a rotating brush using the mixing line 11 of the present invention as a unit material, while maintaining a high level of descaling performance,
It can be seen that a long-life rotating brush with a low rate of decrease in brush diameter can be obtained.

Furthermore, FIG. 10 shows the diameter of the corrugated stranded wire 10 of the mixed wire 11 which is the unit material of the present invention constituting the rotating brush, the diameter of the single wire which is the conventional unit material, and the linear scratch pattern on the surface of the red-hot steel material 1. This shows the results of examining its performance in relation to the incidence rate, where the × mark indicates the case of the conventional single wire, and the ○ mark indicates the case of the mixed wire 11 of the present invention.
The case is shown below. According to Fig. 10, in the case of the x mark, the occurrence rate of linear scratch patterns is close to zero within the diameter range of 0.2 to 0.8 mm (in this range, it is impossible to put it into practical use). As mentioned above), 0.8
Within the range of ~5.0 mm, the incidence of linear scratch patterns increases as the diameter increases, and in the case of ○, the incidence of linear scratch patterns remains close to zero even as the diameter increases. This shows that it is optimal for descaling.

As is clear from the survey data mentioned above,
When applying a rotating brush made of the mixed stranded wire 11 having the above configuration using the corrugated stranded wire 10 with a thickness within the range of 1.0 to 5.0 mm, the descaling rate, the reduction rate of the brush diameter, and the linear scratches are It can be seen that satisfactory results can be obtained in all aspects of pattern occurrence rate.

Furthermore, the above research data also suggests that a unit steel wire of 0.2 to 0.8 mm is optimal as the material for the corrugated stranded wire.

Effects of the invention Due to the above-mentioned effects, the present invention is extremely effective in putting into practical use a rotary brush descaling method that replaces the high-pressure water injection method, and eliminates the drawback of this method, which is the bending of the brush wire. That is, it is possible to reliably prevent problems such as a decrease in the diameter of the rotating brush, and to accurately accomplish the purpose of descaling the red-hot steel material.

Furthermore, the tip portions of the corrugated stranded wires of the mixed wire are untwisted, and as a result of this untwisting, the outer layer of the rotating brush is made up of a set of untwisted single wires with waveform twisting and a set of the above-mentioned corrugated single wires. By forming an abrasive part and making the abrasive part act on the surface of the above-mentioned red-hot steel material, it is possible to take advantage of the characteristics of stranded wire while also having the advantages of corrugated single wire, and also to increase the density of this single wire and descale it. In addition, stranded wires made of steel wires are difficult to separate and tend to have smooth ends as they are used, but by forming the untwisted abrasive part in advance, Untwisting can be induced subsequently, and the descaling can be performed in the presence of the abrasive section at all times. Furthermore, since the wires are twisted together to give the wires a twist, the untwisting described above can very easily form a dense state of untwisted single wires with a waveform twist. Furthermore, the brush material is a mixture of a corrugated stranded wire made of multiple thin steel wires and a corrugated single wire made of thick steel wire, so that the thin steel wire maintains the descaling effect and the thick steel wire increases bending strength. It is possible to provide a rotating brush with a longer life compared to conventional products.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a phenomenon in which the diameter of a rotating brush decreases due to the bending tendency of a single wire, which is a unit material constituting a conventional rotating brush, and FIGS. 2 to 10 show an embodiment of the present invention. Figure 2 is a side view showing an outline of a rolling line in which the rotating brush of the present invention is implemented, Figure 3A is an enlarged side view of a steel wire forming a corrugated stranded wire;
Figure A ₁ is an enlarged side view of the corrugated stranded wire, Figure B is an enlarged side view of the steel wire forming the corrugated single wire, Figure B ₁ is an enlarged side view of the corrugated single wire, and Figure C is an enlarged side view of the mixed wire. , FIG. 4 is an enlarged side view of the mixed wire after untwisting, FIG. 5 is an enlarged plan view of the mixed stranded wire made of steel wire with a circular cross section, and FIG. 6 is an enlarged side view of the mixed wire with the same cross section. FIG. 7 is an enlarged plan view of a case formed by a circular steel wire and a steel wire with a rectangular cross section, FIG. 7 is a front view of the descaling state by a rotating brush made of the above-mentioned mixed wire, and FIG. 8 is a diagram showing the use of the mixed wire according to the present invention. FIG. 9 is a graph showing the descaling rate in the case of using a conventional single wire, FIG. 9 is a graph showing the reduction rate of the rotary brush diameter, and FIG. 10 is a graph showing the rate of occurrence of linear scratch patterns. 1...Red-hot steel material, 7...Rotating brush, 9,9'
...Steel wire, 10...Corrugated stranded wire, 10'...Corrugated solid wire, 11...Mixed wire, 12...Untwisted single wire with corrugated twist, 13...Grinding section.

Claims (1)

[Scope of utility model registration request] A rotating brush that acts on the surface of a red-hot steel material in the rolling process to remove scales from the red-hot steel material, which is made of a thin steel wire with a thickness of 0.2 to 0.5 mm, and a plurality of wires selected within the range. Thin steel wires are twisted together so as to wrap around each other and corrugated to form a corrugated stranded wire, and the thickness of the corrugated stranded wire is 1 to 1.
5 mm, and also select a thick steel wire in the range of 0.3 to 0.7 mm, corrugate the thick steel wire selected in the range to form a corrugated single wire, and combine it with the above corrugated stranded wire. A rotating brush is composed of a mixed wire of corrugated single wires, and the tips of the corrugated stranded wires are untwisted to form an outer layer of the rotary brush including a set of untwisted single wires with a waveform twist and a set of the above-mentioned corrugated single wires. 1. A rotary brush for descaling hot-rolled steel material, characterized in that the abrasive part is formed, and the red-hot steel material is descaled in the abrasive part.