JPH06190513A - Production of metal strip - Google Patents

Abstract

PURPOSE:To obtain a production method for strip, in which strip-making on a cooling roll can be stabilized. CONSTITUTION:At the time of conveying the tip part of the strip to a coiling device 10 by injecting molten metal on the surface of the cooling roll 1 rotated at high speed to make the metal strip 3 and thereafter, detaching this strip 3 from the cooling roll 1 and successively, catching the tip part of the strip to pinch rolls 9 and shifting the pinch rolls 4 while giving the strip tension, the remained material 12 on the strip stuck on the detached surface of the metal strip at the cooling roll 1 is removed with a doctor blade 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a metal ribbon by a quenching process using a cooling roll, and in particular, stabilizes a plate-making process, which is a rapid solidification process of molten metal on a cooling roll. Is what you are trying to do. In recent years, by a rapid cooling process using a chill roll, development of a manufacturing technique for directly processing molten metal (including alloy) into a metal ribbon (hereinafter, referred to as a ribbon) has been advanced, but in industrialization thereof, One of the important development issues is to always perform thin strip plate making in a favorable environment, that is, to stabilize the plate making.

Particularly, in the case of an amorphous alloy ribbon, the plate thickness is
Extremely thin below 50 μm, and the plate-making speed is usually 20 m /
s or more. Furthermore, the produced amorphous alloy ribbon is
The material properties change depending on the plate-making speed, and often the mechanical strength is impaired, so the plate-making speed cannot be changed even when winding or rewinding on the take-up reel,
This made technological development more difficult.

[0003]

2. Description of the Related Art JP-A-57-94453 and JP-B-59-34
Japanese Patent No. 467 discloses that a take-up reel is arranged close to a cooling roll, a magnet is embedded in the reel, and a ribbon is wound on the reel.

Further, in Japanese Patent Laid-Open Nos. 56-12257, 59-43772 and 59-138572, etc., a transfer technique is developed on the assumption that a winding machine is arranged at a remote position of a cooling roll. Proposals made from the front are made. All of these are intended to effectively convey by using a suction machine, a brush roll or a brush and a solid roll as a pinch roll for capturing a ribbon.

[0005]

In the plate-making process on the cooling roll, the properties of the ribbon are determined, and if the plate-making is not performed stably, subsequent guiding and conveyance of the ribbon. It will also have a great impact on the steel plate, and it is extremely important to stabilize the plate making. However, all of the above-mentioned techniques are proposals for guiding and transporting the thin strip peeled from the cooling roll, and there is no description regarding stabilization of plate making.

Therefore, the present invention intends to advantageously solve the above-mentioned problems, and an object thereof is to propose a method for producing a ribbon, which can stabilize the plate making on a cooling roll.

[0007]

Means for Solving the Problems The inventors of the present invention have made diligent studies on the cause of the unstable state at the early stage of plate making and the deterioration of the ribbon quality in long-term plate making. It was found that the presence of ribbon remnants, which consisted mainly of ribbon strips, had an adverse effect. That is, the ribbon is peeled from the cooling roll by means such as an air knife, but fine ribbon remnants are present on the surface of the roll after the peeling, and this remnant remains on the molten steel paddle as the roll rotates. It has been newly found that the molten steel paddle becomes unstable and the ribbon property deteriorates. The present invention has been completed based on the above findings.

That is, according to the present invention, a molten metal is poured onto the surface of a cooling roll that rotates at a high speed and rapidly solidified to form a ribbon, which is then peeled from the cooling roll and conveyed to a winding device. The method for producing a metal ribbon (first invention) is characterized in that the ribbon residue remaining on the strip peeling surface of the cooling roll is removed by a doctor blade.

Further, according to the present invention, the doctor blade is provided behind the doctor blade with a short interval in the rotating direction of the cooling roll,
Furthermore, by placing a doctor blade, the negative pressure generated behind the doctor blade in the previous stage lifts up the fine ribbon residue adhering to the minute recesses on the surface of the cooling roll that has passed through the doctor blade in the previous stage. It is a method for producing a thin metal strip (second invention), characterized in that the strip residue is removed by a doctor blade in the subsequent stage.

Further, according to the present invention, a gauze roll is arranged at the rear of the doctor blade to capture the fine ribbon remnants lifted from the surface of the cooling roll by the doctor blade, to produce a metal ribbon. It is a method (third invention). In order to facilitate the removal of the ribbon residue by the doctor blade and reduce the damage on the cooling roll surface, it is advantageous to implement chromium plating or chromium + nickel composite plating.

Now, FIG. 1 shows an apparatus for manufacturing a ribbon which is suitable for the method of the present invention. In the figure, reference numeral 1 is a cooling roll rotating at a high speed. Molten metal is poured out from a nozzle 2 having a slit-shaped opening on the cooling roll 1, and the molten metal is rapidly solidified on the cooling roll 1. Thin strip 3
To form. Next, the thin strip 3 is separated from the cooling roll 1 by blowing air from the air knife 4, and then the thin strip 3 is passed through the deflow 6 and the transport guide 7 by the air flow generated by the suction blower 5, and then on the transport carriage 8. It is placed on the path line reaching the pinch roll 9 and guided to the gap of the pinch roll 9, and then the thin strip 3 is captured by the pinch roll 9, and then the proper tension is applied to the thin strip 3 by the rotation of the pinch roll 9. , The carrier 8 is moved while crushing the tip of the thin strip 3 which is continuously sent by the suction blower 5,
The thin strip 3 is conveyed to the winding device 10 and wound on the coil by the winding device 10. The pinch roll 9 is disclosed in
It is preferable to use a pair of solid roll and brush roll disclosed in Japanese Patent No. 3652.

According to the present invention, in order to stabilize the plate making on the cooling roll 1 in the production of the ribbon which comprises the above-described series of steps, as shown in FIG. A doctor blade 11 is disposed behind the cooling roll 1 in the rotating direction, and the thin ribbon remnants 12 adhering to the thin strip peeling surface of the cooling roll 1 are removed by the doctor blade 11 to stabilize the plate making.

Further, in the method shown in FIG. 3, the doctor blade 13 is arranged behind the doctor blade 11 in the direction of rotation of the cooling roll 1 with a slight gap, and the doctor blade 11 is cooled behind the doctor blade 11 in the preceding stage. Due to the negative pressure generated by the rotation of the roll 1, the finer ribbon remnants 14 that have entered the minute recesses on the roll surface are lifted up and then removed by the doctor blade 13 in the subsequent stage to further stabilize the plate making. It is what makes it.

Further, in FIG. 4, a gauze roll 15 is arranged behind the doctor blade 12 shown in FIG. 2, and the ribbon remnants 16 lifted up by the doctor blade 12 are removed by the gauze roll 15.
By taking in the gauze on the surface, the cooling roll 1
Cleans the surface more and stabilizes the plate making.

[0015]

After the strip is peeled off from the cooling roll, strip residues such as scraps and small pieces of strip are attached to the roll surface. It is observed that the thin scraps and the like remain, particularly when the splashes in the paddle instability period at the early stage of plate making are solidified in a large amount and adhere to the roll surface. However, even during steady casting, it may occur due to separation of the solidified ribbon at the edge portion of the ribbon due to paddle vibration or the like. That is, it is inevitable that the thin strip waste remains, and therefore, when the thin strip peeling surface moves as it is, it reaches the molten steel paddle under the nozzle and changes the solidification conditions and the like in the molten steel paddle, making the plate making unstable. .

Therefore, in the present invention, before the strip stripping surface with the strip remnants attached moves to the molten steel paddle,
That is, immediately after the strip is peeled off, the strip residue is removed by a doctor blade, the roll surface moving to the molten steel paddle is kept clean, and a constant rapid solidification is always achieved to stabilize the plate making.

Incidentally, in consideration of the size and the adhered state of the thin ribbon remnants, means for utilizing the negative pressure generated between the two doctor blades (FIG. 3) and means for further arranging the gauze roll (FIG. 4). The ribbon residue can be completely removed by appropriately selecting or combining the above.

[0018]

【Example】

Example 1 As shown in FIG. 1, C: 1 at%, Si: 9 at%
And B: a molten alloy containing 10 at% and having a balance of substantially iron is maintained at a temperature of 1300 ° C., and then rotated at a high speed (25 m / m) from a nozzle 2 having a slit-shaped opening of 200 mm width.
s) Pour on the surface of the copper alloy cooling roll 1
A thin strip 3 having a width of 25 μm and a width of 200 mm was prepared. Then, the thin strip 3 is peeled from the cooling roll 1 by the air knife 4, and an air flow of 25 m / s or more is generated by the suction blower 5, and the thin strip 3 is guided to the gap of the pinch roll 9 by being placed on this air flow, After being caught by the roll 9, the pinch roll 9 is moved to convey the thin strip 3 to the winding device 10, where the pouring is started.
After 30 seconds, it was wound into a coil.

For the surface of the cooling roll 1 from which the thin strip 3 has been peeled off, which has been plated with chromium in a thickness of 30 μm,
As shown in FIG. 2, the ribbon residue was removed by the doctor blade 11 arranged under the following conditions. Note ・ Doctor blade line pressure; 300 g / cm ・ Doctor blade width; 250 mm ・ Doctor blade contact angle; 20 °

As a result of producing a ribbon while removing the above ribbon residue, the ribbon was wound well without breakage, and the obtained ribbon had an extremely good property.

Comparative Example 1 Under the same manufacturing conditions as in Example 1, a thin strip was manufactured without a doctor blade. A molten steel paddle break occurred in 2 out of 10 heats, and was obtained in the other 1 heat. Abnormal surface texture was found on the thin ribbon.

Example 2 Under the same manufacturing conditions as in Example 1, as a result of removing the ribbon residue by two-stage arrangement of doctor blades (same specifications as in Example 1) shown in FIG. Similarly good results have been obtained.

Example 3 The doctor blade (Example 1) shown in FIG. 4 was used under the same manufacturing conditions as in Example 1 except that the cooling roll was plated with chromium to a thickness of 30 μm and the underlayer was plated with nickel to a thickness of 100 μm.
And the same specifications as gauze roll (defatted cotton thread gauze
As a result of removing the thin ribbon residue by combining a 100 mmφ steel roll surface wound with a thickness of 20 mm), good results were obtained as in Example 1.

[0024]

EFFECTS OF THE INVENTION According to the present invention, since the strips can be stably manufactured, continuous winding can be stabilized, and the strips with good properties can be produced in high yield and in large quantities. Therefore, its industrial utility is extremely large.

[Brief description of drawings]

FIG. 1 is a schematic view showing a ribbon manufacturing facility that is suitable for the present invention.

FIG. 2 is a schematic diagram illustrating a method for removing a thin ribbon remnant.

FIG. 3 is a schematic diagram illustrating a method of removing a thin ribbon remnant.

FIG. 4 is a schematic diagram illustrating a method for removing a thin ribbon remnant.

[Explanation of symbols]

 1 Cooling Roll 2 Nozzle 3 Thin Strip 4 Air Knife 5 Suction Blower 6 Deflor 7 Transport Guide 8 Transport Cart 9 Pinch Roll 10 Winding Device 11 Doctor Blade 12 Thin Strip Remaining 13 Doctor Blade 14 Thin Strip Remaining 15 Gauze Roll 16 Thin Strip Remnants

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shun Suhara 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Kawasaki Steel Co., Ltd. Chiba Steel Works (72) Toru Sato 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Kawasaki Steel Works Co., Ltd. Chiba Steel Works (72) Inventor Saburo Moriwaki 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Works Chiba Works

Claims (4)

[Claims] 1. A molten metal is poured onto the surface of a chill roll that rotates at a high speed and rapidly solidified to form a metal ribbon, which is peeled from the cooling roll and conveyed to a winding device. A method for producing a metal ribbon, characterized in that the ribbon remaining adhered to the peeling surface of the metal ribbon of the roll is removed by a doctor blade. 2. The method according to claim 1, wherein a doctor blade is arranged behind the doctor blade at a short distance in a rotation direction of the cooling roll, and a negative pressure generated behind the doctor blade in the preceding stage is used. , A metal characterized in that the fine ribbon residue adhered in the minute recesses on the surface of the cooling roll that has passed through the doctor blade in the preceding stage is lifted up, and the ribbon residue is removed by the doctor blade in the subsequent stage. Method of manufacturing thin ribbon. 3. The method according to claim 1 or 2, wherein a gauze roll is arranged behind the doctor blade to capture the fine ribbon remnants lifted from the surface of the cooling roll by the doctor blade. A method for manufacturing a metal ribbon. 4. The method according to claim 1, wherein the chill roll has a plating layer on its surface.