JPH0366451A - Vibrated brushing device for strip continuous casting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to forming a pool on a part of the circumferential surface of a cooling drum constituting a mold, such as in a twin-drum system.
The present invention relates to a brush device that comes into sliding contact with the surface of the cooling drum in a continuous casting machine that produces thin slabs by cooling and solidifying molten metal injected therein.

[Conventional technology]

Recently, from molten metal such as molten steel to ll1lfll to 10
BACKGROUND ART A method of directly manufacturing thin-walled slabs having a wall thickness of about 1.0 mm using a continuous casting machine is attracting attention. According to this continuous casting method, there is no need to manufacture thin plates from a thick slab through a multi-step hot rolling process as in the conventional method. Since only a single metallurgy is required, a large economic effect can be obtained by simplifying the process and equipment, and it is often preferable from the viewpoint of metallographic structure.

This type of continuous casting method includes a twin drum method in which a pool is formed between a pair of cooling drums 1 and 2 that rotate in opposite directions, as schematically shown in FIG. There are a drum-belt method in which a water reservoir is formed in between, a single drum method in which a water reservoir is formed in a part of one cooling drum, and the like.

In all of these methods, the molten metal in the pool is cooled at the part where it contacts the surface of the cooling drum, begins to solidify from the surface, and solidifies gradually toward the center of the thickness while forming a solidified shell. I'll go. Therefore, if oxides of molten metal are partially attached to the surface of the cooling drum, not only will dents be left (transferred) on the surface of the thin slab depending on the thickness of the deposit, but also Because the heat conductivity is different between the part with the kimono and the part without it, cooling progresses unevenly on the surface of the slab, which causes the thickness of the slab to be uneven. It may cause wrinkles or cracks.

Therefore, it has been considered to scrape off the deposits on the surface of the cooling drum with a rotating brush roll as shown as 3 in FIG. The inventions described above and others have been proposed.

[Problem to be solved by the invention]

The rotating brush roll 3 according to the prior art has a cooling drum 1.
Although it is provided for the purpose of scraping off deposits on the surface of the slab, it is not always possible to reliably prevent cracking of the slab. Rather, if the deposits are not completely scraped off by the rotating brush roll 3 and the deposits remain in the form of streaks, vertical cracks will occur on the surface of the slab. In addition, due to eccentricity of the brush roll 3 or deviation from a perfect circle, deposits tend to remain on the surface of the cooling drum 2 in the form of periodic horizontal stripes 4.5 in the axial direction. This can cause defects such as periodic wrinkles and horizontal cracks on the slab. Furthermore, by applying strong pressure to the surface of the cooling drum with the brush roll to scrape off deposits, it may cause wear and damage to the plating layer on the surface of the cooling drum, and this may cause defects on the surface of the slab. New problems with rotating brush roll systems are emerging.

[Means to solve the problem]

The vibrating brush device for a thin plate continuous casting machine of the present invention presses and slides a non-rotating brush onto a part of the surface outside the hot water pool of a rotating cooling drum constituting a mold for continuous casting. , the brush is vibrated in the axial direction of the rotary cooling drum.

[For production]

Since the vibrating brush device of the present invention has the configuration as described above, molten metal oxides etc. that adhere to the surface of the cooling drum in the molten metal pool during operation of the continuous casting machine are rotated to the brush position. It is captured by the brush and removed almost completely. Since the brush is not rotating, anything trapped inside cannot be thrown out again by centrifugal force.

Moreover, since the brushes vibrate in the axial direction of the cooling drum, there is no possibility that deposits will remain in the form of streaks on the cooling drum. Even if deposits remain on the cooling drum, they remain as a thin film of uniform thickness, so there is no risk of defects in the slab.

Incidentally, what is captured by the brush can be removed without any problem during operation or stoppage by replacing the brush or by vacuum suction.

〔Example〕

An embodiment of the vibrating brush device of the present invention is shown in FIG. The configurations of the cooling drum 1.2, the side weirs (not shown), the sump formed by them, etc. may be similar to those of the prior art.

As a feature of the present invention, in the illustrated embodiment, a non-rotating brush 8 made of a wire rod 7 such as a man-shaped thin hard steel wire densely flocked on one side of the substrate 6 is provided, and the cooling drum 1 is supported by a support device (not shown). is supported by pressure on the surface.

As the wire rod 7, in addition to hard steel wire rods, non-ferrous metal fibers such as thin copper alloy wire rods, and in some cases, heat-resistant synthetic resin fibers, etc., can be used singly or in combination. Although the substrate 6 may be directly flocked with wire rods, it is also possible to have a structure in which two plates are bonded together and pores are formed in only the plate facing the cooling drum to allow the bundle of wire rods 7 to be flocked thereon. Good too.

Another feature of the present invention is that, although the structure is not shown in the illustrated embodiment, the brush 8 is equipped with a vibration device that vibrates the cooling drum 1 in the axial direction, as indicated by the reciprocating arrows. be done. The frequency does not need to be very high, and approximately several tens of hertz is appropriate. The amplitude is 8 when the width of the cooling drum is 8.
In the case of 00 mm, a few centimeters is sufficient. The above-mentioned vibrations can be generated simply by connecting an AC power source of, for example, 50 to 60 hertz to a coil having an iron core or a movable iron piece, so the structure of the vibration device can be extremely simple.

The force pressing the brush 8 toward the surface of the cooling drum 1 is I
Approximately 150 to 160 kg-G per Crl.

This force can be generated by means such as a compression spring (not shown), and it is desirable that its magnitude and lateral balance can be adjusted to some extent.

In addition, since the brush 8 vibrates in the axial direction of the cooling drum,
The axial length is made slightly longer than the width of the cooling drum 1.2. Although the brush for the cooling drum 2 is not shown, it may be similar to the brush 8 described above. Further, the surface formed by the bristles of the wire rod 7 of the brush 8 may be a concave surface that matches the cylindrical surface that is the outer surface of the cooling drums 1 and 2.

When the continuous casting machine is operated, molten metal oxides etc. adhere irregularly to the surface of the cooling drum 1.2 in the pool between the cooling drums 2, but as the drum rotates, the position of the brush 8 changes. When the wire rods 7 are densely planted, the brush 8 is vibrating in the axial direction, so that the brush 8 cannot pass there, and is caught in the group of wire rods of the brush 8. Since the brush 8 is not rotating even though it is vibrating, the captured deposits will not be blown away by centrifugal force.
It accumulates in the brush 8 and is removed during operation by replacing the brush 8 from time to time or by vacuum suction or other methods.

Therefore, the surface of the cooling drums 1 and 2 is completely free of deposits, or even if some remains, it becomes a thin film of uniform thickness, which causes cracks, wrinkles, etc. in the thin slab. It becomes possible to produce slabs with excellent surface quality without generating defects.

FIG. 3 shows the experimental results, in which the total length of transverse cracks that occur in a thin cast stainless steel piece was measured for each unit area. According to the brush device of the present invention, excellent results were obtained in that transverse cracks in slabs were reduced from several times lower than when using a conventional rotating brush roll to about one tenth.

〔Effect of the invention〕

According to the present invention, by using a vibrating brush device with a simpler configuration than the conventional rotating brush roll system, deposits formed on the cooling drum are removed uniformly and do not remain in the form of horizontal stripes or vertical streaks. Even if some deposits remain, the film becomes a thin film with a uniform thickness, so that cracks and wrinkles do not occur in the thin slab, and a high-quality slab without defects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view showing a conventional rotating brush roll system, and FIG. 3 is a view showing experimental results. 1.2...Cooling drum, 3...Rotating brush roll, 4.5...Horizontal stripes of deposits, 6...Substrate, 7...
・Wire rod, 8... Vibrating brush. Figure 2 33

Claims (1)

[Claims] Pressing a non-rotating brush into sliding contact with a part of the surface other than the sump of a rotating cooling drum constituting a mold for continuous casting, and vibrating the brush in the axial direction of the rotating cooling drum. A vibrating brush device for a thin plate continuous casting machine featuring: