JP3406720B2 - Winding method of rapidly solidified ribbon - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rapidly solidifying liquid metals and alloys (hereinafter referred to as "molten metal") on a moving cooling substrate. In the liquid quenching method for obtaining thin strip-shaped metals and alloys, a rapidly solidified thin strip (hereinafter referred to as a "thin strip"
That. ) Is peeled off from the cooling substrate and then wound up online. 2. Description of the Related Art As a liquid quenching method for producing a ribbon, a so-called single roll method in which a molten alloy is supplied onto one cooling roll rotating at a high speed to obtain a ribbon, There is a twin roll method and the like in which molten metal is supplied between a pair of rotating cooling rolls to obtain a ribbon. [0003] A general method of forming a ribbon by a liquid quenching method will be described by taking, as an example, the case of using a single-roll quenched and solidified ribbon manufacturing apparatus shown in FIG. In FIG. 4, molten metal 1 is supplied to tundish 2 so that the level of the molten metal is constant. A tuyere brick 3 is provided on the bottom wall of the tundish 2, and an intermediate nozzle 4 and a nozzle holder 5 are connected to the tuyere brick 3. Holes are provided in the tuyere brick 3, the intermediate nozzle 4, and the nozzle holder 5, and these holes are connected to form the molten metal flow path 6, the enlarged internal space 12 in the nozzle holder.
It becomes. A nozzle tip 7 is attached to the tip of the nozzle holder 5, and a nozzle slit 8 provided inside the nozzle tip 7 communicates with the molten metal flow path 6. FIG. 5 shows an enlarged space 12, a nozzle tip 7, and a nozzle slit 8 in a nozzle holder. The enlarged internal space is a portion where the molten metal flow path 6 is expanded in the nozzle holder 5 in order to obtain a wide ribbon, and the nozzle slit 8 is an opening provided in the nozzle tip 7 for discharging molten metal. Point out. When the stopper 9 is raised, the molten metal 1 in the tundish 2 flows out of the nozzle slit 8 through the molten metal flow path 6 toward the cooling roll 10. At this time, the flow rate of the molten metal flowing out from the nozzle slit 8 toward the cooling roll 10 is controlled according to the molten metal static pressure in the tundish 2. The molten metal flowing out of the nozzle slit 8 is rapidly cooled on the surface of the cooling roll 10 to become a thin strip 11. In FIG. 4, the cooling roll 10 is drawn at a scale larger than the scale of the tundish 2 to facilitate understanding of the entire apparatus. Various methods have been proposed so far as a method of winding a thin strip obtained by a liquid quenching method from a cooling substrate and then winding it on-line. Basically, a method in which a winding roll is used and the winding is performed by rotating the winding roll is employed. In the case of a ribbon with magnetism,
For example, as proposed in Japanese Patent Application Laid-Open No. 57-94453, a method of using a winding roll having a permanent magnet embedded in the surface thereof to catch a ribbon by the force of a magnet, and then winding the winding by rotating the winding roll. It is. In this winding method, after a rapid solidification on a rotary cooling substrate, the magnetic ribbon rotating while being in close contact with the surface of the cooling substrate is peeled off by a sharp high-pressure gas jet, and at the same time, the strip is peeled off. Is magnetized on a winding roll having a magnetic surface on a surface rotating at a peripheral speed equal to or higher than that of the rotating cooling substrate, and then continuously wound. The publication discloses that a roll in which a permanent magnet such as a rare earth cobalt magnet is embedded in the surface can be used as a winding roll. The present inventors have attempted to wind a ribbon by this method in order to wind the obtained ribbon online, for example, when producing a ribbon by a single roll method. As a result, when the thickness of the ribbon is 30 μm or less, it can be wound up.
A good ribbon could be obtained without quality problems. [0009] However, when a thin material having a thickness of more than 30 μm is used for winding, although the winding is possible, the quality of the obtained ribbon is as follows. Problem has occurred. That is, the characteristics deteriorated in mechanical properties such as magnetic properties and ductility. This is because when the thickness of the ribbon is as small as 30 μm or less, the temperature of the ribbon at the time of winding is as low as about 100 ° C. or less, whereas when the thickness of the ribbon exceeds 30 μm, the winding is performed. This is because the temperature of the ribbon at the time becomes high, and finally, the characteristics of the ribbon are affected. In particular, when the ribbon is an amorphous alloy, the characteristics of the amorphous alloy are sensitive to heat, and when exposed to a high temperature, the amorphous alloy tends to crystallize and deteriorate in characteristics. The reason why the temperature of the ribbon in the wound state increases due to the increase in the thickness of the ribbon is that the ribbon is peeled off from the cooling roll at a high temperature due to the increase in the thickness of the ribbon. This is because subsequent cooling of the ribbon is hardly performed. [0011] The above-mentioned problem of poor cooling of the ribbon occurring when winding a thick ribbon is not a problem that occurs only in a method using a winding roll having a magnetic surface, but is a problem of the winding roll. This is an invariable problem that occurs in any method of winding by rotation. SUMMARY OF THE INVENTION An object of the present invention is to provide a method of winding a ribbon which does not cause deterioration of the properties of the ribbon even when producing a ribbon having a thickness exceeding 30 μm. The present invention has the following matters as its gist. That is, a plate obtained by ejecting liquid metals and alloys onto a moving cooling substrate.
In a method of winding a rapidly solidified thin ribbon having a thickness of more than 30 μm online, the ribbon is separated from the cooling substrate, and before being wound by a winding device, at a position of 15 mm or less from the ribbon.
Dry gas is ejected from the gas ejection nozzle
A method for winding a rapidly solidified ribbon, wherein the ribbon is blown at 20 kg / cm ² or more to cool the ribbon. Hereinafter, the present invention will be described in detail. First,
The method of the present invention will be described with reference to FIG. The molten metal is transferred from the tundish 2 to a cooling substrate (“Cooling roll 1” in FIG. 1).
0 ". Hereinafter, it is referred to as “cooling roll”. When the thin strip 11 supplied and manufactured above is wound on-line, one or more gas ejection nozzles 17 are arranged between the cooling roll 10 and the winding device 14. A dry gas is blown onto the surface of the ribbon 11 moving between the winding devices 14, and then the winding roll 1
3 winds the ribbon 11. In order to mass produce ribbons,
With disc 15 rotates this, the assumption that can not be sufficiently wound ribbon 11 with one winding b Lumpur, also a system to wait a spare winding roll 13 'for cooling b Lumpur side Can be adopted. In the present invention, the dry gas used for cooling the ribbon is, for example, a gas dried using a commonly used drying device or the like. More specifically, for example, the gas is a gas having a dew point of 0 ° C. or less. If a gas containing water is used for cooling the ribbon, moisture will adhere to the surface of the ribbon, causing rust and the like on the surface of the ribbon after winding, which is a problem. As a type of the drying gas used for cooling the ribbon, an inert gas such as helium gas is preferable, but the type of the gas is not particularly limited in the present invention. In addition, the gas pressure at the time of jetting from the gas jetting nozzle 17 is not particularly limited, but the gas pressure cannot be fulfilled if the gas pressure is too small.
For example, 5 kg / cm ² or more is preferable. The number of gas ejection nozzles 17 may be one or more depending on the degree of cooling. In the case of using a plurality of ribbons, it is preferable to spray from both sides of the ribbon as shown in FIG. Further, as schematically shown in FIG. 2, a plurality of gas ejection nozzles may be combined into one. The shape of the opening 18 of the gas ejection nozzle 17 is schematically shown in FIG. As shown in FIG.
When a rectangular hole is used or when the width of the ribbon is wide, a plurality of rectangular holes may be arranged in consideration of the strength of the nozzle as shown in FIG. Further, a plurality of round holes as shown in FIG. 3C may be arranged. The position for disposing the gas ejection nozzle 17 is as follows:
The position is not particularly limited as long as it is between the cooling roll 10 and the winding roll 13. In short, it suffices if it is possible to realize cooling of the ribbon stripped from the cooling roll before winding. Conditions for cooling the ribbon with gas will be described later in Examples. As the winding condition of the ribbon used in the method of the present invention, for example, the distance between the winding roll and the cooling roll at the time of catching the leading end of the ribbon should be as close as possible without collision, for example, 10 mm. Or less. However, when the leading end of the ribbon is captured and the winding can be stably performed, the winding roll is moved away from the cooling roll so that at least a space for disposing the gas ejection nozzle can be secured. The winding roll that can be employed in the method of the present invention is a roll in which a permanent magnet such as a rare earth cobalt magnet or samarium-cobalt is embedded so as to be exposed on the surface. In addition, a roll in which magnetism is generated on the surface by an electromagnet method may be used. Although the single roll method has been described as a method of forming a ribbon, the method of the present invention is, for example, to supply a molten alloy to a pair of high-speed rotating cooling rolls to obtain a ribbon. It can be applied to other liquid quenching methods such as a roll method. Preferred casting conditions for forming a ribbon will be described in detail in Examples. The present invention will be further described below with reference to examples. Example 1 A five-charge ribbon production experiment was performed using the apparatus for producing a single-roll ribbon in air shown in FIG. The alloy used for the experiment was
Fe-Si _6.5 -B ₁₂ -C ₁ amorphous alloy.
The nozzle opening shape of the molten sample jetting nozzle tip used for casting was a shape in which two 1 mm × 150 mm slits were arranged in parallel at an interval of 2 mm in the casting direction. Further, the flow rate of the molten sample of the above alloy melted by the high frequency induction method was set to 50 kg / min, and was sprayed on the peripheral surface of a cooling roll made of copper to form a ribbon. The thickness of the ribbon was controlled by the surface speed of the cooling roll for each charge so as to have a predetermined value. As shown in FIG. 3A, between the cooling roll and the winding device.
As shown in FIG. 1, two rectangular gas ejection nozzles 17 each having an opening of 2 mm × 150 mm were arranged on both sides of the transported ribbon as shown in FIG. These nozzles were made of brass. After the start of casting, the leading end of the ribbon is caught by a take-up roll. Immediately thereafter, the take-up roll is retracted, and the disk is rotated. After the winding reaches a steady state as shown in FIG. Was brought close to the ribbon (at a position 15 mm from the ribbon), gas was blown from all the gas ejection nozzles to the ribbon surface at the same pressure, and winding was continued. The gas at this time was a helium gas having a dew point of −20 ° C. The gas pressure at this time was set to 20 kg / cm ² . The winding roll used has a surface of φ10 mm
It was made of aluminum having a width of 200 mm and a diameter of 600 mm, in which samarium-cobalt in the form of a round bar of 6 mmt was embedded so that adjacent magnetic poles were different. As a result, good ribbons were obtained at all charges. The obtained ribbon had a width of about 150 mm for each charge. The ribbon thickness is the weight, length, width and alloy density of the ribbon (7.26 g / cm ³ )
Calculated from In order to evaluate the magnetic properties of the ribbon, a sample having a length of 200 mm was taken every 20 mm in the longitudinal direction, and an iron loss value (W _13/50 : 1.3 Tesler, iron loss value at 50 Hz) was measured by an SST device. ) Was measured. The results obtained are shown in Table 1. 1-5
Shown in Although the thickness of the ribbon was in the range of 33 μm to 79 μm, the iron loss value was 0.12 W /
It showed a good value of less than kg. From this result, it is judged that the problem of poor cooling at the time of winding the ribbon was solved by blowing the gas before the winding to cool the ribbon. [Table 1] Example 2 A two-charge ribbon production experiment was conducted using the apparatus for producing a single roll ribbon in air shown in FIG. Between the cooling roll and the winding device, an opening of 2 mm × 1 as shown in FIG.
A 50 mm rectangular gas ejection nozzle 17 is
Are placed on both sides of the thin ribbon to be conveyed, one at a time as shown in FIG. These nozzles were made of brass. After starting the casting, after performing a predetermined operation, these nozzles were brought close to the ribbon (at a position 10 mm from the ribbon), and gas was blown from both gas ejection nozzles to the ribbon surface at the same pressure. . The gas at this time was a helium gas having a dew point of −20 ° C. The gas pressure at this time was 30 kg / cm ² . Other conditions were the same as in Example 1. As a result, good ribbons were obtained for both charges. The obtained ribbon had a width of about 150 mm for each charge. The sheet thickness and iron loss value data of the obtained ribbon were used as sample Nos. 6 and 7.
The measurement of the sheet thickness and the iron loss value of the ribbon was the same as the method shown in Example 1. The thickness of the ribbon is 41 μm and 62 μm, respectively.
μm. The iron loss value of each charge is 0.1
It showed a good value of 15 W / kg or less. From this result, it is determined that the problem of poor cooling at the time of winding the ribbon was solved by blowing the gas before the winding to cool the ribbon. Example 3 A two-charge ribbon production experiment was performed using the apparatus for producing a single roll ribbon in air shown in FIG. Between the cooling roll and the winding device, individual openings as shown in FIG.
The gas ejection nozzles 17 in which 22 mm holes were arranged at 2 mm intervals were arranged on both sides of the thin strip to be conveyed, three by three so as to be at the position shown in FIG. These nozzles were made of brass. After starting the casting, after performing a predetermined operation, these nozzles were brought close to the ribbon (at a position 10 mm from the ribbon), and gas was blown from both gas ejection nozzles to the ribbon surface at the same pressure. . The gas was an argon gas having a dew point of −23 ° C. The gas pressure at this time was 30 kg / cm.
^{And 2} . Other conditions were the same as in Example 1. As a result, good ribbons were obtained for both charges. The width of each of the obtained ribbons was approximately 150 mm for each charge. The sheet thickness and iron loss value data of the obtained ribbon were used as sample Nos. 8 and 9.
The measurement of the sheet thickness and the iron loss value of the ribbon was the same as the method shown in Example 1. The thickness of the ribbon is 45 μm and 60 μm, respectively.
μm. The iron loss value of each charge is 0.1
A good value of less than 2 W / kg was shown. From this result, it is judged that the problem of cooling failure at the time of winding the ribbon was solved by blowing the gas before the winding to cool the ribbon. Comparative Example Using the apparatus for producing a single roll ribbon in air used in the examples,
A ribbon of an Fe-Si _6.5 -B ₁₂ -C ₁ amorphous alloy was manufactured, and winding was attempted by a winding roll. The experiment is
3 charges were implemented. The nozzle opening shape of the molten sample jetting nozzle tip used for casting was a shape in which two 1 mm × 150 mm slits were arranged in parallel at an interval of 2 mm in the casting direction. Further, the flow rate of the molten sample of the above alloy melted by the high frequency induction method was set to 50 kg / min, and was sprayed on the peripheral surface of a cooling roll made of copper to form a ribbon. The thickness of the ribbon was controlled by the surface speed of the cooling roll for each charge so as to have a predetermined value. After the start of casting, the leading end of the ribbon was caught by a take-up roll. Immediately thereafter, the take-up roll was retracted, and the disk was rotated to take up the ribbon. The winding roll used had a width of 20 mm in which a round bar-shaped samarium-cobalt of φ10 mm × 6 mmt was embedded on the surface so that magnetic poles adjacent to each other were different.
It was made of aluminum having a diameter of 0 mm and a diameter of 600 mm. As a result, the width of all three charges is about 1
A 50 mm ribbon was obtained. The sheet thickness and iron loss value data of the obtained ribbon were used as sample Nos. In Table 1. 10 to 12. The measurement of the sheet thickness and iron loss value of the ribbon was the same as the method shown in Example 1. The thickness of the ribbon was 40 μm to 75 μm. The iron loss value is 0.13 W / k for each charge
g and a high value. From this result, it was found that unless cooling by gas was performed before winding, a problem of poor cooling at the time of winding the ribbon occurred, and the magnetic properties of the ribbon deteriorated. According to the method of the present invention, when a rapidly solidified ribbon such as an amorphous alloy is wound online, the winding is performed.
By blowing gas before cooling the ribbon,
Since the problem of poor cooling at the time of winding the strip was solved and the leading end of the thin strip could be captured without any problem at the start of winding, it was possible to produce the thin strip at a high yield.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram for explaining a method of the present invention. FIG. 2 is a schematic view of an example of a gas ejection nozzle used in the method of the present invention. FIG. 3 is a schematic view of an opening shape of a gas ejection nozzle used in the method of the present invention. FIG. 4 is an explanatory diagram for producing a ribbon using a single-roll rapid solidification ribbon producing apparatus. FIG. 5 is an enlarged explanatory view of a nozzle holder portion of the single-roll rapid solidification ribbon manufacturing apparatus. [Description of Signs] 1 molten metal 2 tundish 3 tuyere brick 4 intermediate nozzle 5 nozzle holder 6 molten metal flow path 7 nozzle tip 8 nozzle slit 9 stopper 10 cooling roll 11 thin strip 12 enlarged internal space 13 winding roll 13 'preliminary Take-up roll 14 take-up device 15 disk 16 support roller 17 gas ejection nozzle 18 opening of gas ejection nozzle

Continuation of the front page (56) References JP-A-3-275255 (JP, A) JP-A-3-114636 (JP, A) JP-A-59-127954 (JP, A) JP-A-5-337614 (JP) JP-A-64-57958 (JP, A) JP-A-53-123304 (JP, A) JP-A-59-144558 (JP, A) JP-A-59-141352 (JP, A) 59-10452 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B22D 11/06 390 B22D 11/06 360 B22D 11/124

Claims (1)

(57) [Claim 1] A method for online winding a rapidly solidified thin ribbon having a thickness of more than 30 μm, which is obtained by jetting a liquid metal or alloy onto a moving cooling substrate, after the ribbon is separated from the cooled substrate, before being wound by the winding device, ribbon
Gas jet nozzle located at a position 15 mm or less from
A method of winding a rapidly solidified ribbon, wherein the ribbon is cooled by blowing a dry gas onto the ribbon at an ejection pressure of 20 kg / cm ² or more .