JP2015205290A - Chill roll, and apparatus and method for manufacturing amorphous alloy foil strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chill roll for manufacturing an amorphous alloy foil strip, which enables the amorphous alloy foil strip with great plate thickness to be manufactured on an industrial scale, and an apparatus and a method for manufacturing the amorphous alloy foil strip.SOLUTION: In a chill roll, channels passing through a side surface of the chill roll in a rotational axis direction are arranged at regular intervals on two or more concentric circles centering on the rotational axis of the roll. An apparatus for manufacturing an amorphous alloy foil strip includes the chill roll.

Description

  The present invention relates to a cooling roll for manufacturing an amorphous alloy foil strip, and an apparatus for manufacturing an amorphous alloy foil strip. In particular, the present invention relates to an apparatus for producing an amorphous alloy foil strip provided with a water-cooled cooling roll.

  Conventionally, it has been studied to use an iron-based amorphous alloy with low power loss for the iron core of a transformer or a motor, and the practical use of the transformer is progressing. However, the application to the core transformer has not yet been reported, and even manufacturers that use the core are taking a second step in adopting amorphous materials. In addition, practical application of motors has hardly progressed, and there are only a few examples where conventional thin (thickness of 30 μm or less) foil strips are applied with elaboration.

  If a thick amorphous alloy foil strip is manufactured at low cost industrially, it can be applied not only to a wound core type transformer / reactor but also to a stacked core and a motor. By increasing the thickness of the foil strip, the work efficiency of the iron core machining process is improved and the space factor is increased in the wound core transformer. This reduces the volume of the coil including the iron core and hence the windings. By increasing the thickness, the hysteresis loss is reduced, and in the commercial frequency range, an increase in eddy current loss can be offset and the effect of reducing excess iron loss can be expected. The thickening of the foil strip can not only reduce the power loss but also increase the strength. For motors that rotate at high speeds, an unprecedented product that can withstand the strong centrifugal force acting on the rotor can be realized.

  The most common method for producing an amorphous alloy is to bring a molten alloy into contact with the outer peripheral surface of a roll through a nozzle while rotating a cooling roll made of a metal or alloy having high thermal conductivity. This is a so-called single roll liquid quenching method in which molten alloy is rapidly cooled and solidified into a foil strip shape. The single roll liquid quenching method is a method of manufacturing an amorphous alloy foil strip by rapidly cooling the molten metal by rapidly moving the heat of the molten metal to a cooling roll and solidifying the molten metal before it is crystallized. Here, the “amorphous alloy” includes a multiphase alloy in which 50% or more by volume is amorphous, and the balance is amorphous and the nanosized microcrystals are dispersed and precipitated with the amorphous phase as the parent phase. Even in a material in which 50% or more is a crystal, the manufacturing apparatus and the manufacturing method of the present invention can be used to control crystal grains. Specifically, it is effective for controlling the crystal grain size of a permanent magnet containing neodymium boron.

  In the single roll liquid quenching method, the temperature of the cooling roll rose with the production of the amorphous alloy foil strip, and the amount of heat received from the molten metal by the cooling roll and the amount of heat discharged from the cooling roll to the cooling water were balanced. By the way, the equilibrium state is reached. If the surface temperature of the cooling roll in this equilibrium state is low enough to solidify the molten metal in a supercooled state, the amorphous alloy foil strip can be continuously produced. However, if the cooling rate until the roll temperature is overheated during casting and the glass transition point is not reached, the amorphous foil strip can only be produced within a finite time. .

  In producing a thick amorphous alloy foil, an amount of heat proportional to the plate thickness must be transferred to a cooling roll. However, there is a limit to the amount of heat that can be discharged to the cooling water in contact with the inner surface of the cooling roll. Conventional cooling structures for water-cooled rolls have been configured with cooling water channels that flow along the outer peripheral surface of the roll and the circumferential direction, as shown in known examples (Patent Documents 1, 2, and 3).

  Moreover, although the patent document 4 has arrange | positioned the cooling flow path which penetrates the side surface of a roll, the flow path which contributes to cooling of a roll is inadequate in heat exhaustion capability only by the flow path on the outermost concentric circle. It is. The flow path on the second concentric circle from the outer periphery is provided for temperature control and does not have a cooling device.

  Conventional cooling rolls have a limitation in the amount of heat per unit time that cooling water can be discharged. This is because a cooling channel area larger than the area corresponding to the outer peripheral surface of the roll could not be taken. For this reason, there is a limitation on the thickness of the amorphous material obtained under a certain plate width.

  Patent Document (A manufacturing method for an amorphous alloy foil strip having a plate thickness that greatly exceeds the plate thickness that has been limited so far (25-30 μm for current commercial materials) (industrial production scale, for example, 100 kg or more per charge) 1, 2, 3).

  These methods are methods for continuously producing amorphous foil strips having a thickness exceeding 30 μm, which is the thickness limit (industrial production scale) of conventional amorphous alloy foils. However, since these methods use a plurality of cooling rolls, there is a problem that the equipment becomes large. Moreover, there is a trouble of repeating the molten metal pouring alternately with two cooling rolls, which complicates the operation.

  Recently, a highly durable nozzle material has been found for discharging molten alloy to the outer peripheral surface of a cooling roll. If this nozzle is used, continuous casting is possible for several hours. There is a possibility that a thick amorphous alloy foil strip can be continuously produced even with a single cooling roll without depending on the alternate casting methods of Patent Documents 1 to 3.

Japanese Patent No. 5114241 Japanese Patent No. 5270295 Japanese Patent No. 5329915 JP 2012-086232 A

  An object of the present invention is to provide an apparatus for producing an amorphous alloy foil strip that enables the production of a thick amorphous alloy foil strip on an industrial scale (one charge of 100 kg or more) using a single cooling roll. That is. The thickness of the thick amorphous alloy foil that is commercially available today is limited to 30 μm or less. It is an object of the present invention to propose a technique for breaking through this limitation and continuously producing amorphous foil strips thicker than 30 μm.

  The present invention specifies the structure of the cooling water flow path of the cooling roll in order to produce an amorphous alloy foil strip having a large plate thickness continuously using a single cooling roll. Specifically, in order to obtain an amorphous alloy having a desired plate thickness, a cooling roll structure capable of securing the surface area of the cooling water channel in the roll is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing apparatus of the amorphous alloy foil strip which can manufacture a thick amorphous alloy foil strip on an industrial scale is realizable. As a result, the production cost can be reduced, and the application product can be downsized by improving the space factor. In addition, core loss (iron loss) is reduced, contributing to energy saving. In the case of annealing in a magnetic core used by winding and stacking, uniformity of core temperature can be realized. This is because heat flows from the edge to the inside from the interlayer. By realizing temperature uniformity, the annealing conditions can be optimized. Since the temperature of the entire core is the same in a narrow range, optimal conditions are achieved in each part of the core, and optimal characteristics can be easily achieved.

It is a perspective view which illustrates the manufacturing apparatus of the amorphous alloy foil strip which concerns on 1st Embodiment. It is the (a) front view and (b) side view which illustrate the device of a 1st embodiment. (A) is the schematic diagram which looked at the apparatus which concerns on the modification of 1st Embodiment from the front of the cooling roll, (b) is the through-hole inlet part which attached | subjected the collar-shaped protrusion from the side of a cooling roll. FIG. It is a schematic diagram which illustrates the cooling water channel structure of the cooling roll in 2nd Embodiment. (A) is a typical front view which illustrates the manufacturing apparatus of the amorphous alloy foil strip in 2nd Embodiment, and shows one of the cooling channel systems. (B) is a schematic side view illustrating the cooling roll and the vicinity thereof, and (c) is a front view showing another cooling channel system of the cooling roll. It is a side view which illustrates the manufacturing apparatus of the amorphous alloy foil strip which concerns on the modification of 2nd Embodiment. It is a side view which illustrates the mode (paddle) of the nozzle front-end | tip part which an alloy molten metal contacts with a cooling roll in FIG. It is a conceptual diagram which shows the double slit nozzle and paddle vicinity which are fundamental in this invention. It is a front view of the apparatus which illustrates the twin cooling roll method used when manufacturing the amorphous alloy foil strip of the big board thickness which cannot be achieved with the single roll of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the first embodiment will be described.
FIG. 1 is a perspective view illustrating an apparatus for manufacturing an amorphous alloy foil strip according to this embodiment.
FIG. 2: is the front view which illustrated the (a) cooling roll and the cooling water channel of the manufacturing apparatus which concerns on this embodiment, (b) The side view of a cooling roll.

  As shown in FIG. 1, in the amorphous alloy foil strip manufacturing apparatus 1 according to this embodiment, a cooling roll 11, cooling water supply means 12 for circulating cooling water in the cooling roll 11, and cooling roll 11. Is provided with a driving means 13 (including a drainage means) and a molten metal supply means 17 for supplying the molten metal to the outer peripheral surface 11a of the cooling roll 11. In the molten metal supply means 17, a melting furnace 14 for melting the alloy, a crucible 15 for holding the molten metal A, and a nozzle 16 attached to the bottom surface of the crucible 15 and discharging the molten metal in the crucible 15 downward are provided. Yes. The nozzle 16 is disposed above the cooling roll 11 with a slight gap from the outer peripheral surface 11 a of the cooling roll 11. The manufacturing apparatus 1 is an apparatus for manufacturing the amorphous alloy foil strip S. Here, the “amorphous alloy” is a composite phase in which 50% or more by volume is amorphous, and the balance is nanophase (nm) -sized microcrystals dispersed and precipitated with amorphous as a parent phase. Includes alloys.

Next, the operation of the amorphous alloy foil strip manufacturing apparatus configured as described above, that is, the method for manufacturing an amorphous alloy foil strip according to the present embodiment will be described.
First, in the melting furnace 14, the alloy that is the raw material of the amorphous alloy foil strip S is melted and the molten metal A is poured into the crucible 15. The molten metal A contains at least one of Fe, Co, and Ni in a total of 70 to 95 atomic%, and at least one of the semimetals B, Si, C, and P other than the three types of ferromagnetic metal elements. These elements are contained in an amount of 5 atomic% to 30 atomic%. Further, at least one of Cr, V, Nb, Mo, W, Ta, Cu, and Sn may be added in a range of 0.01 atomic% to 5 atomic% to a part of the ferromagnetic elements shown on the left. Needless to say, the total content of the constituent elements must be 100%, excluding inevitable impurities.

  Of the above additive elements, Cu is indispensable for producing a so-called nanocrystalline material consisting of fine crystal grains in the range of several nanometers to 100 nanometers after producing an amorphous foil and then crystallizing by annealing. It is an element. Even if it is not a nanocrystalline material, in order to improve high-frequency magnetic properties, in order to partially promote crystallization and subdivide the magnetic domain, Cu alone (Fe, Co, Ni)-(B, Si , C, P), it is also within the scope of the present invention to be added in the range of 0.1 atomic% to 2.5 atomic%.

  Sn segregates in a thin layer on the surface of the foil and acts to suppress crystallization, so it is effective in producing an amorphous foil strip of an Fe-based alloy containing a high content of Fe. An alloy containing 82 atomic% or more of Fe is likely to cause surface crystallization by annealing, and the magnetic properties such as iron loss and magnetic permeability are greatly deteriorated. However, when 0.1 mass% to 1 mass% of Sn is contained Crystallization does not occur even after annealing, and the original excellent magnetic properties are maintained. Further, addition of a small amount of S (sulfur) has the same effect as Sn. The amount of S added is preferably in the range of 0.003 to 0.5 mass%.

  The description of the function of the manufacturing apparatus 1 of the present embodiment will be continued. The cooling means 11 rotates the cooling roll 11 while the cooling water supply means 12 circulates the cooling water W through the flowing water path 21 in the cooling roll 11. In this state, a molten alloy A poured from the melting furnace 14 to the crucible 15 is discharged from the nozzle 16 to the outer peripheral surface 11 a of the cooling roll 11.

  At this time, the molten metal A forms a paddle between the outer peripheral surface 11 a of the cooling roll 11 and the nozzle 16. The vicinity of the rotating roll 11 in contact with the roll surface 11a of the paddle cooled by the cooling roll 11 becomes a highly viscous supercooled liquid, which is drawn out in the rotating direction of the roll and is rapidly cooled by the cooling roll 11 to be supercooled. It solidifies as a liquid structure. As a result, a strip-shaped amorphous alloy foil strip S is formed. The amorphous alloy foil strip S moves to a predetermined position together with the outer peripheral surface 11 a of the cooling roll 11, and then is guided and wound up in a direction away from the cooling roll 11. On the other hand, the heat transferred from the molten metal A to the cooling roll 11 is transferred to the cooling water flowing inside the cooling roll 11 and then discharged to the outside of the cooling roll 11 by the cooling water W flowing inside the flowing water path 21.

  The amorphous alloy foil strip manufacturing apparatus of the present invention will be described more specifically. FIG. 2 (a) shows one embodiment of the present invention. The cooling roll 11 is formed with through holes 21a, 21b, and 21c that penetrate the side surfaces. They are provided at equal intervals on a plurality of concentric circles centered on the roll rotation axis shown in FIG. The side view of the cooling roll 11 in FIG. 2B illustrates a state where the through holes are arranged in three concentric circles at equal intervals. The diameters of the through holes are the same size on the same concentric circle.

  Both sides of the cooling roll 11 are covered with covers 22a and 22b, respectively. The cover does not allow the cooling water to escape to the outside, and serves to send or receive the cooling water to the through hole. FIG. 2 shows an example in which the cooling water is sent from the water supply side and the cooling water that has passed through the through hole is flowed to the opposite side. However, as shown in FIG. It is also possible to drain the water through the double pipe after passing through the through hole from the back side after hitting the cover 23b installed on the opposite surface to the cooling water supply side after the water passes through the center of the roll. In the latter, air is less likely to remain, and water tends to flow evenly through the through holes.

  As a modification of the first embodiment, a semicircular shape as shown in FIG. 3B is formed at the end of the through hole entrance (the side far from the rotation axis) on the surface opposite to the water supply side in FIG. When the rib-like projections 26 are attached, the flow of water becomes smooth, and the amount of water flowing through the through holes is easily equalized. No eaves are required on the outlet side of the through hole. However, if it is difficult to balance during roll rotation, a collar may be provided on the outlet side.

  In FIGS. 2 and 3, it is convenient to provide a valve 27 on the cover 23 in order to remove air. Air may remain in the cooling channel. The residual air prevents the cooling water passing through the through hole from being equalized and reduces the cooling efficiency of the roll. Before starting casting, the cooling water is poured to slowly rotate the roll, and the valve provided on the cover (a plurality of one cover may be provided) is opened to bleed and close. By repeatedly opening and closing the valve while rotating slowly, the air remaining in the flow path of the roll can be brought close to zero as much as possible.

Next, a second embodiment will be described.
FIG. 4 is a view illustrating the arrangement of the through holes penetrating the side surface of the cooling roll shown in the first embodiment. In FIG. 2B, adjacent through holes that are concentric are connected by a metal U-shaped pipe. An example is shown. FIG. 4A is a front view of a cooling roll illustrating the second embodiment, and FIG. 4B is a side view of the cooling roll. Moreover, FIG.4 (c) is a figure which shows the flow path of the cooling water provided on the concentric circle nearest to the outer periphery of a roll seen from the front of the apparatus. FIG. 4A shows a cooling water channel provided on the second concentric circle from the outer periphery of the roll.

  In FIG. 4, 62a, 62b, and 62c are, in order from the side of the roll, the cooling water channel closest to the outer periphery, the second concentric channel from the outer periphery, and the third concentric channel from the outer periphery. Is shown.

  FIG. 4 exemplifying the second embodiment shows that contiguous through holes that are concentric are connected by a U-shaped pipe 64. Thereby, the through-holes on the same concentric circle form one flow path branched from the main flow path 21. FIG. 4 shows three examples of concentric circles, so there are three flow paths 21a, 21b, and 21c. Each end is coupled to a rotary diverter rotary joint 63 provided along the rotation axis of the roll. As a result, even during the rotation of the roll, the flow path branched to the main water supply (not shown) for water supply and drainage along the rotation axis is connected.

  In the second embodiment, the flow rate adjusting valve 65 is provided in each of the flow paths 62a, 62b, and 62c branched from the main flow path. If there is a flow control valve in each flow path, an optimal flow distribution can be made according to the width and thickness of the foil strip to be cast. For example, when the plate width and plate thickness are relatively small, the cooling water may be supplied with emphasis on the flow path closest to the outer peripheral surface of the roll. As the plate thickness and plate width increase, the distribution of water supply is also increased in the flow paths on the second and third concentric circles. Thereby, even if the plate thickness and the plate width are increased, the cooling capacity is not insufficient.

More specifically, when producing an amorphous alloy foil strip having a plate thickness of 30 μm, 90% or more of cooling water may be supplied focusing on the flow path closest to the outer periphery of the roll. If the flow rate of the cooling water flowing through the second and third flow paths is increased as the foil thickness increases, it is possible to produce amorphous foil strips having thicknesses of 50 μm, 75 μm, and 100 μm. The heat that cannot be removed by the first flow path is absorbed by the second and third flow paths at almost 100%. The portion surrounding the cooling flow path of the roll is not a mechanically joined multiple rings or sleeves by a shrink fit method or the like, but is a single body, so there is no heat resistance portion, so the heat flow is the original of the Cu alloy. High thermal conductivity can be utilized.

Next, a modification of the second embodiment will be described.
FIG. 5 is a side view illustrating a cooling roll in the present modification. In FIG. 5, for the sake of convenience, the through hole 67 (see FIG. 4A) and the U-shaped pipe 64 (see FIG. 4A) are omitted, and the through holes 21a to 21c which are flowing water paths are broken lines. Is shown.

  As shown in FIG. 5, in the cooling roll 61a in this modification, the flow path of each stage is divided into three. Thereby, compared with the above-mentioned 2nd Embodiment, although the number of the pipes (flow path) gathering to a rotary joint increases (in the example of illustration, 3 times), the temperature rise of cooling water can be suppressed, It becomes possible to increase the exhaust heat capacity of the cooling roll more effectively. This is because the pressure loss of the cooling water channel is reduced.

  In the apparatus for producing an amorphous alloy ribbon provided with the side through-holes according to the present invention, if a device for cooling the cooling water is provided in the middle of the water supply channel, the exhaust heat effect is improved.

  The diameter and width of the cooling roll used in the present invention will be described. These depend on the strength of a support mechanism such as a roll rotating shaft and a bearing that supports the weight of the roll. If the diameter is too large, the cooling capacity is improved, but the load on the support mechanism is increased. On the other hand, if the diameter is too small, the number of branches in the flow path is insufficient and the cooling capacity is insufficient. The diameter should be determined according to the desired thickness. For example, a diameter of 40 to 60 cm is sufficient for a plate thickness of 30 to 60 μm, and a diameter of 60 to 80 cm is appropriate for a plate thickness of 60 to 90 μm. In 90-110 micrometers, 80-100 cm is good.

  As for the width of the cooling roll, the cooling capacity increases as the width increases. However, the effect of widening the width compared with the conventional one-stage cooling roll is small. In the case of one-stage cooling, by increasing the thickness of the roll (distance between the roll surface and the cooling water channel), heat is transferred two-dimensionally and transferred to a wide range of cooling water. However, in the multistage cooling water channel proposed in the present invention (water channel arranged on two or more concentric circles), most of the heat flows one-dimensionally (the temperature gradient is large in the radial direction of the roll). The effect of widening is limited. In other words, the width of the roll only needs to exceed the width of the foil strip to some extent.

  Next, the size of the through hole will be described. Basically, it is only necessary to have a sufficient total surface area of the through holes so that all the heat transferred from the molten metal to the cooling roll is absorbed by the cooling water. Details will be described later. As for the size of the through hole, the ease of drilling and the processing cost are important points. Moreover, the pressure which distribute | circulates cooling water must be an appropriate range. Considering these, the diameter of the through hole is preferably 20 to 50 mm.

  The nozzle (opening for discharging the molten alloy to the cooling roll) used in the present invention is basically a multi-slit nozzle. An example of a double nozzle is shown in FIG. Conventionally, a single slit nozzle is generally used, but even if the width of the nozzle (the dimension measured in the roll movement direction of the rectangular opening) is increased, the thickness of the foil remains constant. No more. According to the experiments by the present inventors and calculations based thereon, it has been found that the thickness of the foil depends on the heat transfer coefficient of the molten metal and the cooling roll. The width of each double nozzle is preferably in the range of 0.2 to 0.8 mm. Further, if the upstream slit width is increased, the bridge width can be increased, which is advantageous from the viewpoint of the strength and wear resistance of the bridge portion. Since the plate thickness increases according to the multiplicity of the nozzles, it is preferable to use triple nozzles when the thickness is 60 to 80 μm and quadruple or five times when the thickness is 80 to 110 μm. It has been confirmed that an alloy foil strip in an amorphous state can be produced up to at least 5 layers.

  That is, the surface temperature of the cooling roll is low at the initial stage of casting. Cu or Cu alloy rolls used due to their high thermal conductivity are poorly compatible with Fe-based alloys. As shown in the equilibrium diagram of the Cu—Fe alloy, the ratio of mutual melting is small at low temperatures (including room temperature). Because they dislike each other, the heat transmitted by lattice vibration is also difficult to be transmitted. The heat transfer rate is low. If the heat transfer coefficient is low, it will not solidify no matter how much molten metal is supplied. That is, the plate thickness does not increase. The excess supply of molten metal simply scatters around as hot water. A stable paddle (a pool of hot water held between the nozzle and the roll) is not formed.

  In order to increase the heat transfer rate, it is necessary to increase the roll temperature. Therefore, at the initial stage of casting, the discharge pressure is set to a low value, and an amount of molten metal corresponding to the heat transfer coefficient is supplied. Then, the paddle is stabilized and all the heat released when it is solidified or turned into a superviscous liquid with high viscosity is absorbed by the roll, and the temperature of the roll rises. As a result, the heat transfer coefficient is increased and a larger amount of heat is received. That is, the foil thickness can be increased.

  I hear that you can't make thick foil with the multiple slit nozzle method. This is because, even though the cooling roll is low, molten metal exceeding the heat absorption capacity of the roll is supplied. The overflowing molten metal scatters and a stable paddle is not formed. Since the heat is not absorbed by the roll, the temperature of the roll will not rise and the thick foil will not be formed. It seems quite common, but not generally recognized.

  As described above, the method illustrated in FIG. 4 is effective in order to accelerate the temperature rise of the cooling roll at the initial stage of casting. For example, when casting is started, water is not supplied to the outermost channel. The flow rate adjustment valve 65 of the corresponding flow path is closed. Then, the outer peripheral temperature of the roll rises quickly. The discharge pressure is increased accordingly. Since the heat transfer rate is high, the solidification speed increases and the plate thickness increases. When the desired plate thickness is reached, water is also supplied to the outermost channel. At this time, since the temperature of the outer peripheral surface of the roll is high, the heat balance is balanced. That is, the amount of heat absorbed by the roll is equal to the heat removal capability of the roll.

  When the plate thickness exceeds a certain level, heat cannot be removed only by the outermost channel. The heat that cannot be removed is absorbed by the water flowing through the second water channel from the outer periphery. If the plate thickness further increases, the water in the third channel is responsible. In this way, the number of channels may be increased according to the desired plate thickness. The three-stage flow paths shown in FIGS. 4 and 5 are not limited to this, and may be adjusted depending on the plate thickness.

In carrying out the present invention, the arrangement of the through holes, that is, the distance from the outer peripheral surface of the roll must be determined. However, when the cooling water channel is set only on the outermost periphery as in the prior art, the thickness of the roll is important, but cannot be specified in the present invention. As long as Cu or Cu alloy with high thermal conductivity is used (the thermal conductivity is 70% or more of pure Cu), the total surface area of the through-holes penetrating the side of the roll absorbs the heat input to the roll per unit time. It is not necessary to specify the wall thickness if possible. The amount of heat transferred to the cooling water can be estimated by using the total surface area of the cooling water flow path and the forced convection heat transfer coefficient of water (1.2 to 5.8) × 10 ³ W / kg. The above heat transfer coefficient was referred to the book “How to Learn Illustrated Heat Transfer Engineering” published by Ohmsha (published on January 10, 1985), supervised by Kaneyasu Nishikawa and Naokata Kitayama.

  If a very thick amorphous alloy foil strip is desired, the number of channels as viewed from the roll side may be four or more. As the number of channels increases, the roll diameter must increase. If the roll becomes too large, a problem arises in the strength of the support mechanism such as the rotating shaft and the bearing that supports the roll. In such a case, two rolls are used side by side as shown in FIG. Since the specific example and operation method of the apparatus have already been disclosed in Patent Document 1, the description thereof is omitted here. Modifications are shown in Patent Document 2 and Patent Document 3.

When the cooling roll of the present invention is used in combination with any one of Patent Documents 1, 2, and 3, the time required for roll replacement becomes longer, and thus productivity is increased. Work efficiency is also improved.

1, 2, 3, 4, 5: Manufacturing apparatus, 11: Cooling roll, 11a: Outer peripheral surface, 12: Cooling water supply means, 13: Driving means, 14: Melting furnace, 15: Crucible, 16: Nozzle, 17: Molten metal supply means, 18: moving means of the molten metal supply apparatus, 21a, 21b, 21c: through-hole, 26: protrusion, 61a: cooling roll, 62: cooling water channel branched from the main pipe, 62a: cooling water channel on the outermost periphery of the roll, 62b: second cooling water channel from outer periphery of roll, 62c: third cooling water channel from outer periphery, 63a: water supply side rotary joint, 63b: drainage side rotary joint, 64: U-shaped pipe, 65: flow control valve, 67: penetration Hole, 71a, 71b: Cooling roll, 72a, 72b: Cooling water supply means, 73: Driving means, 74a, 74b: Water supply pipe, 75a, 75b: Drain pipe, 77: Rail, 81: Sleeve Preparative, A: molten, C: rotary shaft, P: Paddle, S: amorphous alloy foil strip

  Both sides of the cooling roll 11 are covered with covers 23a and 23b, respectively. The cover does not allow the cooling water to escape to the outside, and serves to send or receive the cooling water to the through hole. FIG. 2 shows an example in which the cooling water is sent from the water supply side and the cooling water that has passed through the through hole is flowed to the opposite side. However, as shown in FIG. It is also possible to drain the water through the double pipe after passing through the through hole from the back side after hitting the cover 23b installed on the opposite surface to the cooling water supply side after the water passes through the center of the roll. In the latter, air is less likely to remain, and water tends to flow evenly through the through holes.

  I hear that you can't make thick foil with the multiple slit nozzle method. This is because, despite the low temperature of the cooling roll, the molten metal exceeding the heat absorption capacity of the roll is supplied. The overflowing molten metal scatters and a stable paddle is not formed. Since the heat is not absorbed by the roll, the temperature of the roll will not rise and the thick foil will not be formed. It seems quite common, but not generally recognized.

Claims (2)

  A flow path that penetrates the side surface of the cooling roll in the direction of the rotation axis is disposed at equal intervals on two or more concentric circles centered on the rotation axis of the roll. Cooling roll.   The manufacturing apparatus of the amorphous alloy foil strip provided with the cooling roll of Claim 1.

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