JPH044956A - Apparatus for producing rapidly cooled metal strip - Google Patents

Abstract

PURPOSE:To enable mass-production of rapidly cooled metal strip by making an air knife for detaching the rapidly cooled metal strip from cooling roll surface as orthogonally crossing a pass line and freely swingable with a horizontal swinging axis as center. CONSTITUTION:Molten metal is injected from an pouring nozzle 1 and molten paddle 3 is formed at between the nozzle and the cooling roll 2, and the molten metal is rapidly solidified with dissipation of the heat from the cooling roll to make the rapidly cooled metal strip 4. The metal strip stuck on the cooling roll is detached with air 6 injected from the air nozzle 5 and flown in the hood 8. The metal strip coming to pinch rolls composed of a brush roll 9 and a solid roll 10 is applied with tension with the pinch rolls to form the pass line at between the pinch rolls and a deflecting roll 7. The metal strip going out from the pinch rolls is made to pulverized strip 14 with a fan 11. By this method, the continuous coiling of the metal strip is stably executed and the mass production of metal strip can be executed.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a guide for transporting a rapidly cooled metal ribbon such as an amorphous alloy ribbon produced by a single roll method from a cooling roll to a winding device. - Concerning the conveyance device.

<Conventional technology> In recent years, molten metal (including alloys; the same shall apply hereinafter) is directly quenched using liquid cooling properties such as the single-roll method and the twin-roll method.
Development of manufacturing technology for processing into thin strips is underway. The important technology in this type of direct plate making technology is the plate making technology itself related to the uniformity of plate thickness and surface texture.
When considering industrial production, it is equally important to establish a winding technology for winding into a coil.

In the case of crystalline metal ribbon with a thickness of 100 μm or more, the VI manufacturing speed is usually 5 m due to restrictions on solidification due to heat transfer to the cooling body.
/sec or less. In this case, JP-A-61-88
8 in Japanese Patent Application No. 904, winding can be carried out by conveyance using a menschheld having a ramper and winding using a heat-resistant heddle wrapper.

However, amorphous alloy ribbon (hereinafter abbreviated as amorphous ribbon)
In this case, the plate thickness is extremely thin, 50 μm or less, and the plate manufacturing speed is usually 20 m/sec or more, so the conventional technology cannot be applied as is. Moreover, the material properties of the manufactured amorphous ribbon change depending on the plate-making speed, and the mechanical strength is often lost, 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 the technique disclosed 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 ribbon. . This method is an ingenious method that eliminates the need for cumbersome conveying techniques by locating the winder in close proximity 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, JP-A-56-12257, 59-43772
No. 5,943,8572, etc., the development of conveyance technology is tackled head-on on the premise that a winder is placed at a remote position from the cooling roll. All of these methods use suction machines, brush rolls, etc. as pinch rolls to capture the amorphous ￥rffl band, and attempt to convey it effectively, but what about the structure? ! This method was complicated and did not necessarily provide stable transportation.

<Problems to be Solved by the Invention> Until now, there have been fewer reports regarding conveying and winding techniques compared to plate-making techniques for amorphous ribbons.

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 ribbons, and developed a system using a pair of brush rolls as pinch rolls. He previously made an invention based on the use of a brush solid roll that is a combination of a brush solid roll and a solid roll (see Japanese Patent Application Laid-Open No. 1143720). According to this technology, non-woven fabrics manufactured by rapid solidification on a cooling roll can be used. After the crystalline ribbon is peeled off from the cooling roll, it passes through the hood and reaches the aforementioned pinch roll portion. Then, the pinch rolls are pressed down to apply appropriate tension to the amorphous ribbon, and the conveying cart is started to move toward the winding machine. However, the peeling point of the amorphous ribbon from the roll varies depending on the casting conditions and the geometric dimensions of the ribbon, and is not always constant.In order to ensure the optimal peeling point, the pressure and jet of air must be adjusted. There is also a method of canting, but this method is not sufficient when conditions change significantly and reduces the success rate of manufacturing.

The peeling point of the ribbon from the cooling roll is determined by the adhesion strength, which depends on the components of the amorphous ribbon, the roll material, the roll temperature, the ribbon temperature, the roll surface roughness, and the amorphous ribbon. Since various factors are involved, such as geometric dimensions, air flow rate, pressure, angle, etc., it is difficult to always maintain a constant optimum separation point. Conventionally, this was handled by adjusting the pressure of the air from the air knife or cutting the air further. In some cases, this method alone is not sufficient, resulting in a low manufacturing success rate.

<Means for Solving the Problems> As a result of various experiments on controlling various peeling points, the present inventors found that the air angle can be changed even if the manufacturing conditions or the geometric dimensions of the quenched metal ribbon change significantly. As a result, we found out that rough adjustments can be made online, and by adding to that knowledge the conventional adjustment of partially cutting the air, we were able to create the present invention, which allows for even more reliable manufacturing.

That is, the present invention consists of: (1) a hood and a pass for guiding the rapidly cooled metal ribbon, which is rapidly solidified into a thin ribbon on a cooling roll rotating at high speed and then peeled off from the surface of the cooling hole with an air knife, to a pinch roll; Defloration that determines the line,
In an apparatus for manufacturing a quenched metal ribbon, which includes a pinch roll that captures the guided quenched metal ribbon and a transport vehicle that loads the pinch roll, the air knife is rotated around a horizontal rotation axis perpendicular to the pass line, This is an apparatus for manufacturing Elephant Metallurgical IA thin strip, which is characterized by being freely rotatable, and ■ equipped with a slide board on the cooling roll side of the top surface of the hood for adjusting the shape of the gap between the cooling roll and the hood. This is an apparatus for producing the described quenched metal ribbon.

<Effect> The present invention will be specifically explained below.

FIG. 1 shows a schematic diagram of an apparatus according to the present invention. Molten metal is ejected from a pouring nozzle 1, forms a molten puddle 3 with a cooling roll 2, and rapidly solidifies by removing heat from the cooling roll. This is cold metal ribbon 4. The rapidly cooled metal ribbon adhering to the cooling roll is abraded by the air 6 ejected from the air nozzle 5 and flies inside the hood 8. The quenched metal ribbon 4 that has reached the pinch rolls consisting of the plano roll 9 and the solid roll 10 is tensioned by the pinch rolls, and forms a pass line with the deflo roll 7. The metallurgical thin strip passed through the pinch roll is fan 1.
1 becomes a pulverized ribbon 14. Since the pinch roll and the fan 11 are mounted on the carrier 15, the ribbon can be transported to the winder by moving the carrier 15 to the winder.

The rapidly cooled metal ribbon stuck to the cooling roll is peeled off by the air 6 of the air knife 5, flies through the hood, and reaches the pinch roll. At this time, there is an optimum value for the peeling point, and it is important to always keep it within the standard value.
As shown in the figure, if the peeling point is low, the angle, metallurgical 'Fi'
The I band crawls on the hood floor surface 8b, its speed decreases, and it becomes jammed inside the hood, causing a blockage. On the other hand, as shown in Figure 3, when the peeling point is high, the ribbon does not come into contact with the hood even after leaving the roll, and the air flow velocity is higher than that of the angle metallurgical RTR belt, resulting in congestion. You can reach the pinch roll without any problems.

As described above, the peeling point has an important meaning in stable conveyance of the rapidly cooled metal F'l strip, but this peeling point is greatly influenced by the plate-making conditions. In particular, drastic changes in conditions such as changing the width of the quenched metal ribbon or replacing the rolls cannot be handled using conventional methods such as controlling the peeling point, such as using a slide board 1G to partially cant the air from an air knife. This resulted in a low manufacturing success rate.

As a result of various experiments, the present inventors discovered that controlling the air jet angle is a method that can safely and reliably deal with large changes in the separation point. Conventional slide boards are suitable for fine air control, but cannot handle large changes in the separation point.

Therefore, by combining these two, the peeling point can be controlled arbitrarily. As a specific device, the air knife 5 shown in FIG. 1 is made rotatable around a rotating shaft 12. As shown in FIG. 2, the air knife angle θ1 is initially set slightly larger to prevent initial winding. Next, after confirming the position of the separation point flN, θ is changed to adjust and set the air knife angle θ2 close to the optimum value as shown in FIG. Then, the Jl final flight line is determined by fine adjustment using the slide board 16, and the ribbon can be stably conveyed.

<Example> Using a device as shown in Figure 1 and a freely rotatable near knife equipped with an air knife rotating shaft, a distance of 100 mm was measured under the following conditions.
Experiments were conducted to produce quenched metal ribbons of 150 mm width and 150 mm width.

- Molten metal; FegaB+oSi, C+ (atomic%),
Melting temperature: 1300'C1 Pouring nozzle: 100mm width and 150mm width slits, cooling roll: made of water-cooled copper alloy, cooling roll peripheral speed 125m/sec, solid roll: 200mmφ diameter, steel, brush roll i 200mmφ diameter, stainless steel wire 0.15 lung diameter, pinch roll circumferential speed: 28 m/sec Quenched metal ribbons with a thickness of 20 μm, a width of 100 m, and a uniform width of 150 mm are manufactured, and by using the freely rotatable air knife of the present invention, a width of 100 mm can be obtained. θ2=20 degrees,
For a width of 150 layers, each of the strips was adjusted online to θ2 = 15 degrees, and then the slide board was adjusted to smoothly engage the pinch rolls, allowing stable conveyance of the ribbon.

Under the same manufacturing conditions as in Example 1, the air knife was of a conventional fixed type, and the peeling point was adjusted only by air pressure. In Comparative Example 1, the peeling point could not be brought to the optimum value and catching with a pinch roll was not possible.

In Comparative Example 2, under the same manufacturing conditions as Example 1, the air knife was of a conventional fixed type, and the peeling point was adjusted using air pressure and a slide board.The 100 mm width could be peeled off at the optimum peeling point, and the tension was applied by pinch rolls. I was able to add On the other hand, with a width of 150 mm, the peeling point could not be brought to the optimum value and catching with the pinch rolls was not possible, resulting in failure in conveyance and winding.

<Effects of the invention> As described above, by using the present invention, quenched gold BF
The conveyance and winding of the il strip can be carried out in 6TIs, continuous winding can be carried out stably, and mass production of quenched metal thin strips has become possible.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an experimental apparatus according to the present invention, and FIGS. 2 and 3 are schematic diagrams of usage conditions (examples) of a rotary air knife. ■... Pouring nozzle, 2... Cooling roll, 3...
... Molten metal paddle, 4... Quenched metal ribbon, 5...
・Air knife, 6...Air 7...Def roll, 8...Hood, 9...Brush roll,
10...Solid roll, II...Fan,
12...Air knife rotating shaft, 13...Pinch roll hood, 14...Crushing ribbon, 15...Transportation cart, 16...Slide board, θ, θ1. θ2
...Air knife angle. Patent originator Kawasaki Steel Corporation Figure 3

Claims (1)

[Claims] 1. The quenched metal ribbon is rapidly solidified into a thin ribbon on a cooling roll rotating at high speed, and then peeled off from the cooling roll surface with an air knife. In an apparatus for manufacturing a quenched metal ribbon, the air knife is rotated perpendicularly to the pass line and horizontally. A manufacturing device for rapidly solidified metal ribbon, which is characterized by being able to rotate freely around a shaft. 2. The quenched metal ribbon manufacturing apparatus according to claim 1, further comprising a slide board on the cooling roll side of the upper surface of the hood for adjusting the shape of the gap between the cooling roll and the hood.