JPH02112860A - Method and device for introducing and conveying rapid cooled metal strip - Google Patents

Abstract

PURPOSE:To introduce and convey a strip without any breakage by blowing air against the metal strip rapidly solidified with cooling single roll from downstream side to the single roll rotating direction of the conveying guide to detach the strip and on the other hand, blowing the air from upstream side to control the detaching position. CONSTITUTION:An air knife 3 for detaching the strip 2 rapidly solidified with the cooling roll 1 is set at downstream side in the rotating direction of the cooling roll in the conveying guide 4. On the other hand, an air nozzle 10 is set at upstream side of the conveying guide 4. Then, by blowing the air against the strip 2 from the air nozzle 10, the strip 2 is pushed to the circumferential surface of the cooling roll 1, and balance between this pushing force F1 and the detaching force F2 with the air knife 3 is tried and the position losing the balance F1<F2, that is, the detaching position of the strip 2 is set to almost center position of an introducing hole 4a in the conveying guide 4 to obtain introduction of the strip 2 under non-contacting condition.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to rapidly cooling metal ribbons (hereinafter referred to as ribbons), particularly amorphous metal ribbons, produced by a single roll method.
The present invention relates to a method and apparatus for guiding and conveying a single cooling roll (hereinafter referred to as cooling roll) to a winder.

(Prior Art) In recent years, the development of technology for directly manufacturing ribbons from molten metal (including alloys) has been progressing by liquid quenching methods such as the single roll method and the twin roll method. The important element in implementing these technologies is the plate making technology itself, which determines the uniformity of plate thickness and surface texture, etc., but when producing industrially, it is necessary to It is necessary to establish a winding technique for handling the strip, that is, winding it into a coil.

In the case of crystalline ribbons with a thickness of 100 μm or more, the plate-making speed is usually 5 m/sec or less due to restrictions on solidification due to heat transfer to the cooling body. It can be rolled up by being conveyed by a mesh belt with a clamper and wrapped by a heat-resistant belt wrapper.

On the other hand, in the case of an amorphous ribbon, the plate thickness is extremely thin at 50 μm or less, and the plate-making speed is usually 20 m/sec or more, so the means disclosed in the above-mentioned publication cannot be directly applied. Furthermore, the material properties of amorphous ribbon change depending on the plate-making speed, often resulting in loss of mechanical strength, so the plate-making speed is also changed when winding onto a take-up reel or rewinding The inability to do so made it even more difficult to establish winding technology.

Japanese Patent Publication No. 57-94453 and Japanese Patent Publication No. 5934467
Each publication proposes arranging a take-up reel close to a cooling roll, embedding a magnet in the take-up reel, and winding an amorphous alloy ribbon. This method is an ingenious method that eliminates the need for troublesome conveying techniques by placing the take-up reel close to the cooling roll, but because the take-up reel is so close to the cooling roll, continuous production is not necessarily suitable for In addition, it is not a preferable method when considering industrial production, as it is difficult to secure space for installing inspection equipment for plate thickness, holes, etc., or for arranging a tension control device.

In this regard, JP-A-56-12257, JP-A No. 5943772
No. 59-138572 and patent applications 1982-
Specifications such as No. 290477 directly tackled the establishment of conveyance technology on the premise that a winder would be placed at a remote location from the cooling roll, and all of them involved a suction device, a brush roll, or a pair of brush and solid rolls. proposed that the amorphous ribbon be used as a pinch roll to capture and transport the amorphous ribbon. The amorphous ribbon peeled off from the cooling roll is captured between the pinch rolls without being destroyed.
At the same time, if the necessary tension for conveyance is applied, stable winding can be achieved.

(Problem to be solved by the invention) Compared to plate-making techniques for amorphous ribbons, there are fewer known materials regarding conveyance and winding techniques after plate-making, and it is difficult to consider all techniques. Although it was not easy, the inventors determined that the above-mentioned remote location method basically had an industrial advantage, so they located the winder remotely from the cold roll, and
Guidance of amorphous ribbons that peel off and fly from the cooling roll.
As we worked to further improve the transportation technology, we encountered the following problems.

In the above guidance/conveyance method, a pair of brush/solid rolls, which is a combination of a brush roll and a solid roll, is used as the pinch rolls, and by sandwiching an amorphous ribbon between the pinch rolls, the tension required for conveyance can be reduced. Please confirm that it can be granted.

Next, the amorphous ribbon produced by rapid solidification on a cooling roll was peeled off from the cooling roll and then guided to the pinch roll via a guidance guide, using an air knife and guidance guide. However, the guidance was not that difficult. However, even if the pinch rolls were rolled down, the ribbon could not be pulled, and therefore the pinch rolls could not be moved to the take-up reel and used as a general feeding system.

(Means for solving the problem) As mentioned above, if the thin strip peeled off from the cooling roll is simply passed through the guide and reaches the pinch opening, it is difficult to apply the necessary tension for conveyance. I couldn't do that.

This invention aims to realize guidance and conveyance that can apply the tension necessary for conveying the ribbon.

That is, in this invention, a quenched metal ribbon produced by rapid solidification on the peripheral surface of a single cooling roll rotating at high speed is peeled off from the single cooling roll, and then introduced into a cylindrical conveyance guide and placed at the end of the conveyance guide. Guide it to the placed pinch roll,
After capturing the quenched metal ribbon with the pinch rolls, the pinch rolls are moved to the winding machine and the quenched metal ribbon is transported from the downstream side of the conveyance guide in the direction of rotation of the cooling single roll toward the cooling single roll. While blowing air to peel off the quenched metal ribbon, air is blown onto the quenched metal ribbon from the upstream side of the conveyance guide to press the ribbon against the circumferential surface of a single cooling roll and control the peeling position of the quenched metal ribbon. This method is characterized in that the quenched metal ribbon is introduced into the conveyance guide substantially without contact.

Furthermore, it is advantageous to guide the quenched metal ribbon to the pinch rolls with low friction.

In addition, the equipment directly used in the method of this invention includes an air knife that peels the quenched metal ribbon produced by rapid cooling and solidification on the circumferential surface of a single chilled roll from the roll by blowing air, and an apparatus that introduces the peeled quenched metal ribbon. It has a cylindrical conveyance guide that guides the quenched metal ribbon, a pinch roll that is placed at the end of this conveyance guide to capture the quenched metal ribbon, and a conveyance cart that moves this pinch roll to a winding machine. A deflector device is installed to guide the rapidly cooled metal ribbon after peeling into the conveyance guide, and an air nozzle is installed on the upstream side of the conveyance guide in the direction of rotation of the cooling single roll to blow air toward the thin ribbon before peeling. That's what happens.

This invention will be explained in detail below.

FIG. 1 shows a preferred example of an apparatus directly used in the present invention.

1 in the figure is a cooling roll that rotates at high speed, and this cooling roll 1
After the thin strip 2 produced by rapid solidification on a surface is peeled off from the cooling roll 1 with an air knife 3, it is guided into a cylindrical conveyance guide 4, and then transferred to a pinch roll 5 loaded on a conveyance carriage 6. (which is a combination of brush roll 5a and solid roll 5b) captures the ribbon 2, moves the carrier 6 together with the pinch roll 5 to a winder (not shown), and the winder takes the ribbon 2. Wind up. Further, a deflector device 7 is installed on the entry side of the conveyance guide, and functions to form a proper pass line when tension is applied to the ribbon. Note that a high-speed air current is formed in the conveyance guide 4 by a blower 8 installed behind the pinch roll 5. Furthermore, 9 is a pouring nozzle.

Here, an air knife 3 for peeling off the ribbon 2 is arranged on the downstream side of the conveyance guide 4 in the direction of rotation of the cooling roll, while an air nozzle 10 is disposed on the upstream side of the conveyance guide 4. Then, by blowing air at high speed from this air nozzle 10 toward the ribbon 2, the ribbon 2 is transferred to the cooling roll 1.
This pressing force (F,) is balanced with the peeling force (F2) by the air knife 3, and the position where this balance is broken (F, <F,), that is, the peeling position of the thin strip 2, is determined by the conveyance guide. 4, approximately in the center of the inlet 4a of the thin strip 2.
Achieve contactless introduction of

The thin strip 2 introduced into the conveyance guide 4 in a non-contact manner is
8 and guided to the pinch roll 5 and captured by the pinch roll 5. The thin strip 2 fed into the pinch roll 5 forms an appropriate pass line under the guidance of the deflector device 7, and is successively peeled off from the cooling roll 1.

It is preferable that the deflector device 7 is a floater having an air jet hole 7a for floating the ribbon 2 as shown in the figure, or a deflation crawler rotating in the opposite direction to the cooling roll 1 at the same circumferential speed.

(for production) Next, the experiments that led to this invention will be explained.

That is, the thin ribbon 2 was guided and conveyed repeatedly using the apparatus shown in FIG. Note that the deflector device 7 was a deflation crawl type.

According to the above experiment, although the ribbon 2 could be introduced from the cooling roll 1 through the conveyance guide 4 to the input side of the pinch roll 5, it was not possible to apply tension to the ribbon 2. In order to elucidate the cause of this, the behavior of the ribbon flying through the conveyance guide was recorded using a VTR, but only a continuous ribbon could be observed. However, when casting a ribbon such as the amorphous alloy targeted by this invention, the plate-making speed is usually 25 to 30 m/sec.
- It was found that the detailed movement of the ribbon could not be analyzed because it was not possible to obtain a still image without image blur using the boat fishing method. Therefore, the whole place was set in a dark place, and 1,150,000
When the camera was photographed using a strobe light for seconds, it was possible to record a still image of the ribbon flying within the conveyance guide without any image blurring on the VTR.

Next, when we analyzed the records in detail, we found that the VT up to that point
The following results, which were completely unexpected, were obtained using R observation.

That is, (1) The ribbon passing over the deflector roll and the ribbon flying within the conveyance guide were broken in places.

(2) Cracks were often observed in the ribbon passing over the deflector roll and in the ribbon inside the conveyance guide.

(3) The cracked amorphous ribbon was easily broken by applying tension.

It has been newly discovered that such breakage near the deflector roll or within the conveyance guide is the reason why the pinch roll cannot apply tension to the amorphous alloy ribbon.

On the other hand, it is well known that the mechanical strength of amorphous alloy ribbon is extremely high. When we investigated the reasons why this high-strength material easily cracks inside the conveyance guide, we found the following mechanism, especially in the vicinity of the deflector roll.

In other words, the adhesion force of the amorphous ribbon to the cooling roll surface is not necessarily uniform, and therefore, when peeling is proceeded with a constant pressure, the peeling position shifts to the upstream side in the rotation direction of the cooling roll in areas where the adhesion is weak. I will do it. As a result, slack was formed in the ribbon on the upstream side of the deflector roll, resulting in breakage of the ribbon. This is thought to be due to the characteristic that the amorphous ribbon is strong against axle tension but weak against shearing force.

In order to solve this problem, the inventors further investigated various aspects of ribbon breakage near the deflector roll, and found that the cause of this was that the peeling position was not stable. Therefore, in order to counteract the peeling of the ribbon by the air knife, a high-speed air stream was blown toward the cooling roll surface along the rotational direction of the cooling roll from an air nozzle installed upstream of the deflector roll. It was discovered that the peeling position could be stabilized by pressing it against the cooling roll surface. By stabilizing the peeling position, the loosening of the ribbon on the upstream side of the deflector roll was resolved, and the breakage at the deflector roll was resolved.

However, the ribbon breakage that occurs after applying tension to the ribbon and forming a pass line via, for example, a deflector roll, was not resolved by capturing with the pinch rolls. According to an analysis of VTR recordings, this was caused by frictional resistance due to excessive pressure on the deflector roll. Therefore, with the goal of reducing frictional resistance, attempts were made to eliminate frictional resistance by adopting a floater that blows air into the deflector device to levitate the ribbon, or by rotating the deflector roll at the same circumferential speed as the cooling roll. As a result, all methods were able to completely eliminate ribbon breakage. Note that the air floater does not require a driving part, so it is simpler in terms of equipment.

Note that if the conveyance guide 4 as shown in Fig. 1 is not placed between the cooling roll and the pinch roll, there will be no chance of the ribbon breaking due to collision, but without the conveyance guide, the ribbon will not be stable until it reaches the pinch roll. Since it is not possible to guide the object, it is essential to install a conveyance guide in this invention.

(Example) Using the apparatus shown in FIG. 1, B: 10 at%, Sl:
After holding the molten alloy at 1300°C with a composition of 9at%, C:lat%, and the balance Fe, it is injected from a slit-shaped nozzle with a width of 100m+n directly onto a copper alloy cooling roll rotating at high speed (25m/sec). Then, an amorphous ribbon having a thickness of 25 μm was produced.

The ribbon is then peeled off with an air knife, and the amorphous ribbon is smoothly guided into the conveying guide, which is then in an open state.
After confirming the passage between pinch rolls composed of brush solid rolls, the amorphous ribbon was captured by pressing down on the pinch rolls. When peeling from the cooling roll, by maintaining a balance between the high-speed airflow from the pressing air nozzle and the airflow from the air knife, the peeling position of the amorphous ribbon was extremely stable, and the position was maintained upstream of the deflector device. No loose bands were formed on the sides.

Therefore, there was no breakage in the deflector device.

Furthermore, the amorphous ribbon flying inside the conveyance guide does not break within the conveyance guide, and a pinch roll that rotates at a high speed of 2 m/sec from the cooling roll applies stable tension to the amorphous ribbon. Given this, a proper pass line could be formed by the deflector device. In addition, the deflector device was able to levitate the ribbon, so the amorphous ribbon did not break even after the pass line was formed. I was able to transport thin strips.

(Effects of the Invention) As described above, according to the present invention, a rapidly cooled metal ribbon such as an amorphous alloy ribbon manufactured by a single roll method can be
Since it can be guided, conveyed, and rolled up without breaking, it can provide an industrially superior production technology.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the guidance/transport device used in this invention, and FIG. 2 is a schematic diagram of the guidance/transport device used in the experiment. 1... Cooling roll 2... Thin strip 3... Air knife 4... Conveyance guide 4a... Inlet
5...Pinch roll 5a...Brush roll 5b...Solid roll 6...Transportation truck
7... Deflector device 8... Blower 9.
...Pouring nozzle 10...Air nozzle Figure 1

Claims (1)

[Claims] 1. A quenched metal ribbon produced by rapid solidification on the circumferential surface of a single cooling roll rotating at high speed is peeled off from the single cooling roll, and then introduced into a cylindrical conveyance guide. The direction of rotation of the cooling single roll of the transport guide is guided to the pinch roll placed at the end, the quenched metal ribbon is captured by the pinch roll, and then the pinch roll is moved to the winder to convey the quenched metal ribbon. Air is blown from the downstream side towards the single cooling roll to separate the quenched metal ribbon, while air is blown onto the quenched metal ribbon from the upstream side of the conveyance guide to press the ribbon against the circumferential surface of the cooling single roll and quench it. A method for guiding and conveying a quenched metal ribbon, characterized by controlling the peeling position of the metal ribbon and introducing the quenched metal ribbon into a conveyance guide substantially without contact. 2. The method according to claim 1, wherein the quenched metal ribbon is guided to the pinch rolls under low friction. 3. An air knife that peels off the quenched metal ribbon produced by rapid solidification on the circumferential surface of a single cooling roll from the roll by blowing air; a cylindrical conveyance guide that introduces and guides the peeled quenched metal ribbon; It has a pinch roll that is placed at the end of the conveyance guide to capture the quenched metal ribbon, and a conveyance cart that moves the pinch rolls to the winder. A deflector device is installed to guide the
A quenched metal ribbon guidance and conveyance device comprising an air nozzle that blows air toward the ribbon before peeling on the upstream side of the conveyance guide in the direction of rotation of the cooling single roll.