JPH0337768Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotating brush for the purpose of 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. In order to remove this scale, conventionally, a high-pressure water jet descaling method has been used in which high-pressure water is used to blow away the scale of the red-hot steel material. As is clear from the above, this method aims to remove the scale that is firmly attached to the surface of the red-hot steel material by spraying high-pressure jet water. It has problems with large power consumption and large water consumption for injection. In particular, since a large amount of water is injected onto the surface of red-hot steel material, the red-hot steel material to be subjected to rolling is cooled down and the temperature is lowered. The cumulative energy loss was extremely large, placing a large burden on companies.

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.

As a result of various studies to solve the above problems, the inventors have developed a brush descaling method in which a rotating brush is applied to the surface of red-hot steel to descale it. However, although this brush descaling method can solve the heat loss and water consumption problems of the high-pressure water jet descaling all at once, if a thin single wire that does not cause scratches on the soft red-hot steel surface is used as the brush material, the When the temperature is weak and acts on the surface of a high-temperature steel material, which is the object of the present invention, the tip 2a of the single wire 2 acting on the surface of the red-hot steel material 1 becomes a rotating brush due to the thermal embrittlement, as shown in FIG. is uniformly bent in the opposite direction to the rotational direction P, causing bending 2a' and sitting in a short period of time. There is a problem in that the diameter of the rotary brush with the mark is reduced by h, and the descaling effect is reduced.For this reason, the rotary brush must be replaced with a new one frequently, making it completely impractical from a financial standpoint. There was a big problem.

Therefore, the present invention was devised to solve the above-mentioned conventional problems, and while taking advantage of the advantages of the brush descaling method provided to solve the problems of the high-pressure water injection 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 can accurately accomplish the purpose of descaling red-hot steel materials.

Means for Solving the Problems The present invention solves the above problems by using a plurality of thin steel wires selected in the range of 0.1 to 0.4 mm in thickness and thick steel wires selected in the range of 0.3 to 0.6 mm in thickness. A stranded wire with a mixed waveform is formed with a wire having a thickness in the range of 1 to 5 mm, a rotating brush is formed with the stranded wire with a mixed waveform, and the tip of the stranded wire with a mixed waveform is formed on the outer layer of the rotating brush. is twisted back to form a cleaning section consisting of a densely packed wave-twisted single wire of the thick steel wire and thin steel wire, thereby descaling the red-hot steel material.

Function: When the rotating brush with the above configuration is used to descale red-hot steel materials, the untwisting induces subsequent descaling, resulting in aggregation of wave-shaped twisted single wires made of strong and thick steel wires, and a cleaning effect. A collection of twisted single wires made of thin steel wires with excellent properties exhibit their respective characteristics and act 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 solves the problems of the conventional brush descaling method, such as the surface of the rotating brush becoming mirror-like, 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 under pressure by 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. As shown in Figure 3A, multiple thin stainless steel wires 9 (Φ0.1 to 0.4 mm) and multiple steel wires 9a (Φ0.3 to 0.6 mm) slightly thicker than the above steel wires 9 are used.
(60-70% thick steel wire 9a, thin steel wire 9
30 to 40%) and twisted together to form a single stranded wire 10, as shown in FIG. 3B. This stranded wire 10 may be bent into a wave shape to form a mixed corrugated stranded wire 11, or a wrapped steel wire 9b may be wound around the outer periphery of the mixed corrugated stranded wire 11 as shown in FIG. 4A.
The mixed corrugated stranded wire 11a is wrapped in a spiral shape, and one of these is used as a unit material to constitute the rotary brush 7 consisting of the channel type brush roll or the disk type brush roll, and each of the mixed corrugated stranded wire 11 or An untwisting force is applied to the tip of the brush 11a to untwist it as shown in FIG. A cleaning section 13 is formed.

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. The rotary brush 7 thus constructed is rotated at high speed in a direction opposite to the moving direction of the red-hot steel material 1, and descaling is performed while applying pressure to the surface of the red-hot steel material 1.

The mixed corrugated stranded wire 11 or 11a, which is the unit material constituting the rotating brush 7, is formed of a bundle of steel wires 9, 9a having a circular cross section as shown in FIG. 5, or as shown in FIG. It is formed by a mixed bundle of steel wires 9 having a circular cross section and steel wires 9a' having a rectangular cross section.

Descaling rate, reduction rate of brush diameter, and red-hot steel in the case of applying the rotating brush of the present invention in which the above-mentioned mixed corrugated stranded wire is used as a unit material and in the case of applying a conventional rotating brush in which a single wire is used as a unit material. The results of investigating the incidence of linear scratch patterns are shown in FIGS. 8 to 10. In the mixed corrugated stranded wires 11 and 11a of the present invention used as this experimental sample, the thick steel wire 9a has a diameter of 0.6 mm, and the thin steel wire 9 has a diameter of 0.25 mm.

Figure 8 shows the descaling rate when using the mixed waveform stranded wire 11 of the present invention and when using a conventional single wire in descaling. The data of the stranded wire 11 with a mixed waveform of the invention is shown. According to this figure 8,
If the conventional unit material is a single wire, the diameter is 0.2 to 1.0 mm.
Although a high level of descaling rate can be obtained within the range of decreases to 3.0~
It can be seen that within the range of 5.0 mm, the descaling rate remains at almost the same low level and cannot be used.

On the other hand, in the case of applying the twisted wire with the mixed waveform of the present invention, it is shown that a uniformly high level of descaling rate can be obtained within the range of 1.0 to 5.0 mm. Furthermore, Figure 9 shows the results of investigating the performance of descaling using the mixed waveform stranded wire 11 of the present invention and the conventional single wire from the reduction rate of the rotating brush diameter depending on the material diameter. , where the x mark indicates the conventional case, and the ○ mark indicates the case of the mixed corrugated stranded wire 11 of the present invention. According to this Figure 9, ×
In the case of the mark, as the diameter becomes thicker within the range of 0.2 to 2.0 mm, the rate of decrease in the rotating brush diameter decreases rapidly, and within the range of 2.0 to 5.0 mm, the rate of decrease in the rotating brush diameter remains at almost the same low rate. Although no reduction in the brush diameter is observed, in the range of the single wire diameter mentioned above, the descaling rate decreases significantly as shown in FIG. 8, making it impossible to put it into 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. This shows that by using the mixed corrugated stranded wire 11 to remove scale from the surface of red-hot steel, a long-life rotating brush with a low rate of decrease in brush diameter can be obtained while maintaining high descaling performance. .

Furthermore, Figure 10 shows the results of investigating the performance from the incidence of linear scratch patterns on the surface of the red-hot steel material 1 when applying the mixed corrugated stranded wire 11 in descaling and when applying the single wire. indicates the case where the conventional single wire is applied, and the circle mark indicates the case where the mixed corrugated stranded wire 11 of the present invention is applied. According to this Figure 10,
In the case of × marks, the occurrence rate of linear scratch patterns is close to zero within the diameter range of 0.2 to 0.8 mm (as mentioned above, it cannot be used for practical purposes in this range). It can be seen that within the range of 0.8 to 5.0 mm, where the descaling rate is high, as the diameter becomes thicker, the incidence of linear flaw patterns increases, making it impossible to put it to practical use.

On the other hand, in the case marked with ○, even if the diameter is made thicker and the stiffness is sufficiently strengthened, the occurrence rate of linear scratch patterns remains close to zero. It can be seen that the twisted wire 11 has good suitability.

As is clear from the survey data mentioned above,
If a rotating brush whose unit material is the mixed corrugated stranded wire 11 having the above configuration within the range of 1.0 to 5.0 mm is applied,
It can be seen that results satisfying the performance can be obtained in all aspects of descaling rate, brush diameter reduction rate, and linear scratch pattern generation rate.

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

Effects of the Invention According to the present invention, due to the above-mentioned effects, it is extremely effective in putting into practical use a rotary brush descaling method that replaces the high-pressure water jet descaling method, and eliminates the disadvantages of the same method. It is possible to effectively prevent problems such as bending of certain brush wires, that is, a reduction in the diameter of the rotating brush, and accurately accomplish the purpose of descaling red-hot steel materials. Furthermore, the tip portion of the mixed corrugated stranded wire is untwisted, and by this untwisting, the outer layer of the rotating brush is made of a thin steel wire with an excellent cleaning effect and a strong thick steel wire with a corrugated twisted single wire. By forming an abrasive part consisting of a densely packed 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 taking advantage of the advantages of thick steel wire and thin steel wire with corrugated twisted single wire. Moreover, the density of this single wire is increased to make descaling effective. In addition, corrugated stranded wires made of steel wire are difficult to separate and tend to have uneven ends due to use, but by forming the untwisted abrasive section in advance, the wire will continue to untwist as it is used. The descaling process can be carried out in the presence of the abrasive section at all times. Furthermore, since the twisted wires are given a twist by twisting them together, it is possible to form a densely packed state of wave-shaped twisted single wires by untwisting the wires.

Furthermore, according to the present invention, since the mixed corrugated stranded wire is formed from a plurality of steel wires of two or more different diameters, the high rate of decrease in brush diameter, which is a weak point of thin steel wire, is not compensated for by thick steel wire. The thin steel wire has the effect of compensating for the high incidence of linear scratch patterns, which is a weak point of the thick structure, and in addition, since the stranded wire is formed into a wave shape, this wave shape and the wave shape due to the untwisting habit can be easily differentiated. The combined action makes it possible to provide a long-life rotating brush that is resistant to bending against the rolling force applied to the surface of the red-hot steel material, has a rich restoring force, and achieves good descaling.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a phenomenon in which the diameter of a rotating brush made of a single wire is reduced due to bending when applied to the surface of a red-hot steel material, and Figs. 2 to 10 show an embodiment of the present invention. , Fig. 2 is a side view showing an outline of a rolling line in which the rotating brush of the present invention is implemented, Fig. 3A is an enlarged view of a steel wire forming a stranded wire, and Fig. 3B is an enlarged view of a steel wire forming a stranded wire with mixed corrugations. FIG. 4A is an enlarged view of the stranded wire with a mixed waveform. FIG. An enlarged view of a stranded wire, FIG. 5 is an enlarged plan view of the above-mentioned mixed corrugated stranded wire formed of an aggregate of steel wires with a circular cross section, and FIG. 6 is an enlarged view of a steel wire with the same circular cross section and a steel wire with a polygonal cross section. Enlarged plan view when formed by a mixed aggregate with lines,
Fig. 7 is a front view of the descaling state using the rotating brush made of the stranded wire with mixed waveform, Fig. 8 is a graph showing the descaling rate when using the stranded wire with mixed waveform and single wire, and Fig. 9 is the same rotating brush. FIG. 10 is a graph showing the rate of decrease in diameter, and FIG. 10 is a graph showing the rate of occurrence of linear flaw patterns. 1... Red-hot steel material, 7... Rotating brush, 9... Thin steel wire, 9a... Thick steel wire, 10... Twisted wire, 1
1, 11a...Twisted wire with mixed waveform, 12...Single wire with waveform twist, 13...Cleaning section.

Claims (1)

[Scope of utility model registration request] It is a rotating brush that acts on the surface of red-hot steel material in the rolling process to remove the scale of the red-hot steel material, and the brush is used to select a thin steel wire with a thickness of 0.1 to 0.4 mm and a thick steel wire with a thickness of 0.1 to 0.4 mm. Select a wire in the range of 0.3 to 0.6 mm, twist a plurality of thick steel wires and thin steel wires in the range so as to wrap around each other, and make them corrugated to form a mixed corrugated stranded wire. is set to have a thickness in the range of 1 to 5 mm, and the rotating brush is constructed using mixed waveformed stranded wires in the range as unit materials, and the tip portions of each of the unit materials are twisted back to form the outer layer of the rotating brush. A rotary brush for descaling hot-rolled steel material, characterized in that the abrasive section is formed of a densely packed wave-twisted single wire of thin steel wire and thick steel wire, and the abrasive section descales the red-hot steel material.