JPH02112857A - Device for introducing and conveying rapid cooled metal strip - Google Patents

Abstract

PURPOSE:To prevent the development of twine of a strip around a solid roll by constituting a pinch roll for catching the metal strip rapidly solidified with cooling roll with a hollow solid roll having an air blowing hole on the surface of roll body and a brush roll. CONSTITUTION:Molten metal injected from a pouring nozzle 1 forms molten metal paddale 3 on the cooling roll 2 and by rapidly solidifying, the rapid cooled metal strip 4 is made. Then, this is detached from the cooling roll 2 with the air 6 of an air knife 5 and the directional tendency is given by suction force with hoods 12, 12' and a fan 11, and this is introduced into the pinch roll composed of the hollow solid roll 15 having the air blowing hole on the surface of roll body and the brush roll 9. Then, the strip 19 is separated from the pinch roll without sticking to the solid roll 15.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for transporting rapidly cooled metal GT strips such as amorphous alloy ribbons produced by a single roll method from a cooling roll to a winding device. This relates to guidance/conveyance equipment.

(Prior Art) In recent years, the development of manufacturing technology that directly processes molten metal (including alloys, hereinafter referred to as "intermediate") into metal ribbons by liquid quenching methods such as the single roll method and the twin roll method has been progressing. The first important requirement in such direct sheet manufacturing technology is the sheet manufacturing technology itself in terms of uniformity of sheet thickness and surface texture, but when considering industrial production, coil It is also important to establish a winding technique for winding it into shapes.

In the case of crystalline metal ribbons with a thickness of 100 μm or more, the plate-making speed is usually 5 m/min due to restrictions on solidification due to heat transfer to the cooling body.
It will be less than a second. In this case, JP-A-61-88904
As proposed in the above publication, winding can be carried out using a mesh belt having a ramper and winding using a heat-resistant heat-resistant wrapper.

However, in the case of amorphous alloy ribbon, the plate thickness is 50 μm.
Since it is extremely thin, less than m/sec, and the plate-making speed is usually 20 m/sec or more, conventional techniques cannot be applied as is. Moreover, the material properties of the manufactured amorphous alloy ribbon change depending on the plate-making speed, and the mechanical strength is often impaired, so it is difficult to make the plate when winding it on a take-up reel or rewinding it. The speed could not be changed, which made the development of winding technology even more difficult.

Japanese Unexamined Patent Publication No. 57-94453 and Japanese Patent Publication No. 59-34
In Japanese Patent No. 467, the problem of conveyance is avoided by arranging a take-up reel close to the cooling roll, and a magnet is embedded in the take-up reel to wind the amorphous alloy ribbon. This method is an ingenious method that eliminates the need for complicated conveying techniques by locating a winder close to the cooling roll.

However, this method is not necessarily suitable for continuous production because the winder is too close to the cooling roll. Furthermore, it is not possible to secure a space for installing inspection equipment for plate thickness, holes, etc., or for arranging a tension control device, so this method is by no means a preferable method when considering industrial production.

In this regard, Japanese Unexamined Patent Publications No. 56-12257, No. 59-43772, and No. 59138572 address head-on development of conveyance technology on the premise that a winder is disposed at a remote position from the cooling roll. All of these methods use a suction device, a brush roll, a brush solid roll, or the like as a pinch roll to capture the amorphous alloy ribbon to convey it effectively.

(Problem to be solved by the invention) Compared to the conventional sheet-making technology for amorphous alloy ribbon,
There are few reports regarding winding technology.

Based on the judgment that the remote placement method basically has an industrial advantage, the inventors worked on a guided conveyance technology for peeling and flying amorphous alloy ribbons, and discovered the following. I encountered a problem.

Here, as the pinch roll, a brush solid roll, which is a combination of a pair of brush rolls and a solid roll, was used.

After being peeled off from the cooling roll, the amorphous alloy ribbon produced by rapid solidification on the cooling roll reaches the pinch roll portion via a guide. However, even if an attempt was made to apply tension by pinching the ribbon between pinch rolls, the ribbon would wrap around the solid roll and break, making it impossible to continuously apply stable tension to the ribbon.

(Means for Solving the Problem) In order to stably apply tension to the ribbon using pinch rolls, it is necessary to clarify the cause of the wrapping around the solid roll side and prevent the occurrence of such wrapping.

As a result of intensive studies on this point, the inventors have determined that the cause of the wrapping is the hydrodynamic suction force acting on the ribbon.

Therefore, as a solution, it is sufficient to prevent the generation of hydrodynamic suction force acting on this ribbon.

This invention was developed based on the above findings.

That is, this invention provides a conveying guide for guiding a quenched metal ribbon that is rapidly solidified into a thin ribbon on a cooling roll rotating at high speed and then peeled off from the roll surface with an air knife to a pinch roll; A quenched metal ribbon guiding/conveying device comprising a pinch roll for capturing the ribbon and a transport vehicle for loading the pinch roll, wherein the pinch roll is a hollow solid having an air discharge port on the surface of the roll cylinder. This is a device for guiding and transporting rapidly cooled metal ribbons, consisting of rolls and brush rolls.

In this invention, it is advantageous to install a scraper on the quenched ribbon exit side of the pinch roll, and furthermore to provide an inlet and an inlet pipe for introducing compressed air into the roll at the axis of the roll side of the solid roll. It is.

This invention will be specifically explained below.

Figure 5 shows the guidance and guidance around the pinch roll in the conventional device.
The transport section is schematically shown. The molten metal injected from the pouring nozzle 1 forms a molten metal paddle 3 on a cooling roll 2, and is rapidly solidified to become a quenched metal ribbon 4. Even after solidification, the quenched metal ribbon 4 continues to be attached to the cooling roll 2 and cooled. After about half a turn around the cooling roll 2, the ribbon 4 is peeled off from the cooling roll 2 by the air 6 blown out from the air knife 5, and the hood 1212'
It is given directionality by the suction force of the fan 11 and guided to a pinch roll consisting of a solid roll 8 and a brush roll 9. At the beginning of the guidance, the movable solid roll 8 is waiting upward as shown in FIG. 2(a). At this time, the force acting on the ribbon is uniform on the upper and lower sides. This is because the speed of the air flowing between the rolls pinches the ribbon,
This is because, as is clear from the equation below, the air flow equation between the rolls is the same as % (1) where ρ: air density, ■: air velocity, and P: pressure.

Next, when the solid roll 8 moves downward and the pinch roll approaches the ribbon 4 in order to start rolling down, the situation changes as shown in FIG. 2(b).

That is, the gap through which air flows between the solid roll 8 and the ribbon 4 becomes smaller, the air flow velocity increases, and therefore the pressure decreases as is clear from equation (1). On the other hand, even if the brush roll 9 and the ribbon 4 are close together, 1. Since the brush roll 9 passes air, the air flow rate hardly changes. Therefore, a difference in pressure occurs between the upper and lower sides of the ribbon 4, and since the pressure on both sides is small, an upward lifting force acts on the ribbon 4. As a result, a negative pressure phenomenon occurs between the surfaces of both the three bands 4 and the solid roll 8, and they are attracted to each other.

Therefore, immediately before being rolled down by the pinch rolls, the ribbon 4 adheres to the solid roll 8 and rotates while remaining in close contact with the solid roll 8, resulting in winding. The tension of the ribbon 10 that has gone around once increases,
Furthermore, the wrapping continues and excessive tension is applied to the ribbon, eventually causing the ribbon to break.

FIG. 3 illustrates a suction prevention mechanism according to the present invention. As shown in the figure, the solid roll 8 is made hollow and has an air discharge port 17 in the body and an air suction port 16 in the flange, so that the negative pressure between the solid roll 15 and the ribbon 4 is created. In the section, the following formula (2) is used, where P2: Pressure P of the discharge air 18: Pressure U of the air suction port 16,: Roll body circumferential speed U2 Two: Discharge air with a pressure P2 indicated by the roll shaft circumferential speed By ejecting 18, winding is prevented.

Ul"-U2" The second term ρ on the right side of equation (2) teeth, This is the centrifugal water head generated by the rotation of the wheel.

To separate a thin strip from a solid roll, as mentioned above, it is sufficient to create holes in the roll surface to eliminate the negative pressure between the two, and to further increase the separation, add a means to increase the discharge rate. do it.

FIG. 4 shows the flow of air within the solid roll 5 according to the present invention. Here, as a method of increasing the air discharge flow, it is effective to insert a bellow into the cavity of the solid roll to increase the suction force, or to introduce compressed air from the roll shaft.

FIG. 1 shows a guiding/conveying section according to the present invention incorporating solid rolls 15, in which the ribbon 19 that has left the pinch rolls is crushed into a ribbon 20 by a fan 11.
It will be collected.

Note that after the ribbon 19 leaves the pinch roll without adhesion,
Pinch roll hood 1 due to rear air turbulence
3.13' and roll 15 or 9, so in order to further improve the anti-wrapping function,
It is more reliable to install a scraper 21, 21' or an air knife on the outlet side of the pinch roll. In this case, as described above, since the roll and the ribbon are not in close contact with each other, there is no need to bring the scraper 21.21' into contact with the roll 15.9, so there is no risk of damage to the roll surface.

(Example) A comparative experiment was conducted under the following conditions using the guidance/conveyance apparatus shown in FIGS. 1 and 5 above.

- Molten alloy: FeaoB+oSiqC+ (atomic%)
・Melting temperature: 1300°C ・Pouring nozzle: 100 mm Soot lint Cooling roll: Made of water-cooled copper alloy ・Cooling roll peripheral speed: 25 m/sec ・Solid roll: φ200 mm diameter, made of steel The roll according to the present invention has a flange. There are 4 inlet ports with a diameter of φ20 in the part.
There is also a φl n+a+ diameter discharge port on the body.
Opened at m pitch.

O brush roll: φ200 n+m diameter, φ0.2 ma
Wire diameter, stainless steel brush, pinch roll circumferential speed: 2 Bm/sec, air speed in hood: 30 m/sec Tension is applied by a pinch roll to an amorphous alloy ribbon with a width of 100 + am and a thickness of 20 μm created under the above conditions. As a result, the results shown in Tables 1 and 2 below were obtained.

Table 1 Table 2 Furthermore, when a device consisting of a shaft was attached, almost the same results as in the table were obtained, although the shaft structure became a rotary joint and became more complicated.

(Effects of the Invention) By utilizing the pinch roll and scraper according to the present invention, tension can be stably applied to the ribbon, so continuous winding can be stably achieved, and a large amount of winding can be achieved. Commercial production has become possible, and its industrial utility is extremely large.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the guiding/conveying section around the pinch roll according to the present invention, Figures 2 (a) and (b) are illustrations of the mechanism that causes the winding phenomenon in the pinch roll, and Figure 3 is a schematic diagram of the guiding/conveying section around the pinch roll. Fig. 4 is a diagram showing the air flow in the solid roll according to the invention; Fig. 5 is a diagram illustrating the winding phenomenon prevention mechanism according to the invention; Fig. 5 is a diagram showing the air flow around the pinch roll in the conventional device;
It is a schematic diagram of a conveyance part. 1...Pouring nozzle 2...Cooling roll 3...
・Molten metal paddle 4...Quiet-quenched metal thin strip 5...Air knife 6...Air 7...Defroll
8... Solid roll 9... Brush roll 10... Wound quenched metal ribbon 11... Fan 12... Hood 13.
...Pinch roll hood 14...Solid roll rotation shaft 15...Perforated solid roll 16...Air suction port 17...Air discharge port 18...Discharge air 19...Flying ribbon 20
...Crushed ribbon 21...Scraper 22.
・・Transportation trolley diagram 3

Claims (1)

[Claims] 1. A conveyance guide that guides the rapidly solidified metal ribbon, which is rapidly solidified into a thin ribbon on a cooling roll rotating at high speed and then peeled off from the roll surface with an air knife, to a pinch roll; A quenched metal ribbon guidance/conveying device comprising pinch rolls for capturing the guided ribbon and a conveyance truck for loading the pinch rolls, the pinch rolls comprising:
A quenched metal ribbon guiding/conveying device comprising a hollow solid roll having air discharge ports on the surface of the roll cylinder and a brush roll. 2. A quenched metal ribbon guiding/conveying apparatus according to claim 1, characterized in that a scraper is installed on the quenched ribbon exit side of the pinch roll. 3. The apparatus according to claims 1 and 2, characterized in that an inlet and an inlet pipe for introducing compressed air into the roll are arranged at the axis of the side surface of the solid roll. Conveyance device.