JPH0417961A - Apparatus for producing rapidly cooled strip and rapidly cooled small diameter wire rod - Google Patents

Abstract

PURPOSE:To improve the productivity by communicating a molten metal furnace and a nozzle with a supporting tube and continuously supplying molten alloy from the nozzle in twin roll type rapidly strip and small diameter wire rod producing apparatus. CONSTITUTION:In the twin roll type apparatus 1 for producing the rapidly cooled strip and small diameter wire rod by using one pair of the rolls 5, 6 rotated mutually to inside direction, the molten metal furnace 21 and the nozzle 22 are communicatedly connected with a supplying tube 23 as a siphon tube-like and also a vacuum pump 26 is connected with the supplying tube 23a and sucked in the supplying tube to negative pressure, and while adjusting the height from discharging hole in the nozzle 22 to the max. molten metal surface in the supplying tube, the molten alloy is continuously supplied. By this method, the continuous production can be executed and the productivity is improved and also as the supplying rate can be controlled to the constant, the product quality can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a manufacturing device for manufacturing a thin strip or the like by supplying a molten alloy between twin rolls and rapidly solidifying it, and in particular, it relates to a manufacturing device that manufactures a ribbon or the like by supplying a molten alloy between twin rolls and rapidly solidifying the molten alloy. The present invention relates to a structure that can prevent variations in one dimension of the shape of a quenched ribbon or the like by controlling the amount to an appropriate amount, and also enables continuous supply of the molten alloy to realize continuous operation and improve productivity.

[Conventional technology]

A quenched ribbon obtained by supplying a molten alloy between a pair of rolls and rapidly solidifying it has attracted attention in recent years because it has excellent surface properties and can be produced at low cost. Conventionally, when manufacturing such a quenched ribbon, the eighth
A manufacturing apparatus as shown in the figure is employed (see, for example, Japanese Patent Laid-Open No. 59-61554). This manufacturing device 30 includes a twin roll device 31 formed by connecting a drive motor to a pair of rolls 318.31b, a melting and heating furnace 32 disposed above the twin roll device 31, and an alloy material charged therein. a plurality of elongated nozzles 33, and the nozzles 33 are placed in a standby position A;
It is composed of a conveying device 34 for transporting the heating furnace 3.

In order to manufacture a quenched ribbon using the manufacturing apparatus 30, the nozzle 33 charged with the alloy material is carried above the melting and heating furnace 32 by the conveyor 34, and is lowered and inserted into the heating furnace 32. The alloy material inside the nozzle 33 is melted. Then, this molten alloy is heated with an inert gas, for example, Ar.
The gas is injected and supplied between the rotating rolls 31a and 31b from the discharge port 33a of the nozzle 33, and the roll 31a3
A ribbon is produced by rapid solidification in step 1b. Then, the empty nozzle 33 from which the molten alloy has been completely spouted is raised by the transport device 34 and transported to the recovery position B. A quenched ribbon is manufactured by repeating such operations.

[Problem that the invention seeks to solve]

However, the conventional manufacturing equipment described above has a structure that repeats the process of loading and unloading the nozzles one by one, so the manufacturing of the ribbon is temporarily interrupted when the nozzles are loaded and unloaded, which increases the productivity. There is a problem with low gender. In addition, since the inner diameter of the above nozzle is about 10 m,
The amount of alloy material that can be charged into this nozzle is 20 to 40.
There is a limit to g, and from this point of view as well, there is a problem of low productivity.

Therefore, the inventors of the present invention devised a device having a structure as shown in FIG. 7, for example, as an apparatus for continuously supplying molten alloy without interruption. A nozzle 43 is provided at the bottom 42a of a molten metal furnace 42 equipped with a heating source 41, and this molten metal furnace 4
A stopper member 44 is inserted into the nozzle 2 so as to be movable back and forth, and the lower end of the stopper member 44 opens and closes the upper opening of the nozzle 43. Note that a hydraulic cylinder 45, for example, is provided at the upper end of the stopper member 44 to move it up and down.
is connected.

According to this structure, the amount of alloy material charged into the molten metal furnace 42 can be increased, and the supply of molten metal can be continuously supplied without being interrupted. However, in such a structure, there is a problem in that the scene of the molten alloy in the molten metal furnace 42 changes and the discharge pressure from the nozzle 43 changes, making it difficult to adjust the supply amount.

The present invention has been made in view of the above circumstances, and enables continuous operation without interrupting the supply of molten metal to improve productivity.Moreover, it is easy and reliable to adjust the supply amount of molten alloy, and the supply amount can be reduced. It is an object of the present invention to provide an apparatus for manufacturing a quenched ribbon or a quenched small diameter wire that can be controlled to be constant and avoid variations in ribbon dimensions.

[Means for solving problems]

Therefore, the present invention provides a manufacturing apparatus for manufacturing a quenched thin ribbon or a quenched small diameter wire by rapidly cooling and solidifying a molten alloy using a pair of rolls, which includes a molten metal furnace disposed near the rolls and the nozzle. The height from the discharge port of the nozzle to the highest molten metal surface in the supply pipe is adjusted by communicating through a siphon-shaped supply pipe and connecting a vacuum pump to the supply pipe to draw negative pressure inside the supply pipe. It is characterized by continuous supply of molten alloy.

Here, in the present invention, a quenched ribbon or a quenched small diameter wire is obtained by supplying a molten alloy between twin rolls and rapidly solidifying the alloy, and when producing a small diameter wire, the outer surface of the pair of rolls is The molten alloy is supplied into the caliber, which is made up of groove-shaped recesses.

[Effect]

According to the manufacturing apparatus according to the present invention, the higher the degree of negative pressure (degree of vacuum) in the supply pipe, the higher the height of the scene inside the supply pipe, and the higher the height of the scene, the greater the amount of supply from the nozzle. Therefore, in order to keep the supply amount constant, the degree of vacuum must be controlled so that the above-mentioned scene height becomes constant.

In this way, the present invention has a structure in which the molten metal in the molten metal furnace is supplied to the nozzle using the siphon principle through the supply pipe.
The capacity of the molten metal furnace can be selected arbitrarily, and the capacity of the molten alloy metal can be increased as needed without any problems, so the nozzle charged with a small amount of alloy material can be brought in and taken out one by one for melting. Compared to the conventional method, the supply of molten metal can be made continuous, enabling continuous operation and improving productivity.

Furthermore, in the present invention, the molten alloy is supplied by controlling the degree of vacuum in the supply pipe and adjusting the height of the molten metal surface using a vacuum pump connected to the supply pipe. By adjusting the degree of vacuum, the supply amount of the molten alloy can be easily and reliably controlled, and variations in one dimension of the shape of the quenched ribbon can be prevented.6 [Example] Hereinafter, examples of the present invention will be described with reference to the drawings.

1 to 6 are diagrams for explaining an apparatus for manufacturing a quenched ribbon according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes the production apparatus of this embodiment, which is composed of a molten metal supply apparatus 2, a twin roll apparatus 3, and a roll reduction apparatus 4.

The twin roll device 3 is composed of a pressure roll 5 having a water-cooled structure and a fixed roll 6 also having a water-cooled structure.
6 is arranged with its axis facing horizontally. Both ends of the fixed roll 6 are pivotally supported by a fixed housing 7 via sliding bearings 6a, 6a, and the roll 6 is fixed so as not to move in the direction perpendicular to the axis. Further, both ends of the pressure roll 5 are pivotally supported by a movable λ housing (not shown) via slide bearings 5a, 5a, so that the roll 5 is movable in a direction perpendicular to the axis. , and is in line contact with the fixed roll 6. Furthermore, both rolls 5
．． A drive motor 8.8 is connected to one end of the roll 5.6 via a reduction gear, and the motor 8 drives the rolls 5.6 to rotate inwardly.

In addition, cooling rolls 9a and 9b are in line contact with the pressing and fixed rolls 5.6, respectively, in a hack-up manner.
, 6 are arranged so that their axes are located on the same line. The cooling rolls 9a and 9b are each driven by a motor to rotate in the opposite direction to the rolls 56 and at the same circumferential speed. Here, a cooling water injection device 10 is disposed on the outer peripheral surface of both the cooling rolls 9a, 9b, and is configured to cool the pressing and fixed rolls 5.6 via the cooling rolls 9a, 9b. ing. Furthermore, a lubricant jetting head 11 is disposed close to both of the cooling rolls 9a and 9b, and the lubricant is jetted from the jet 11 to prevent the roll surface from becoming rough.

Further, a polishing roll 12 is in line contact with the vertical lower part of the pressing and fixed rolls 5, 6, and each polishing roll 12 is arranged in the same direction and at the same circumferential speed as both the rolls 5, 6. Rotationally driven by a motor. This is configured to remove the molten metal and figurine A attached to the pressing and fixed rolls 56.

The roll lowering device 4 includes a pressing means 13 that applies a pressing force to the pressing roll 5, and a correcting means 14 that corrects elastic deformation of the pressing roll 5 caused by this pressing force.

The pressing means 13 is constructed by connecting a hydraulic cylinder 15 to both bearings 5a of the pressing roll 5, and connecting a hydraulic pump 16 to the cylinder 15.

By this pressing means 13, the pressing roll 5 constantly presses down the fixed roll 6 with a predetermined pressure in the direction perpendicular to the axis.

Further, the correction means 14 includes both bearings 5 of the pressure roll 5.
A hydraulic cylinder 17 is connected to a, and a hydraulic pump 18 is connected to each cylinder 17. This straightening means 14 corrects both bearings 5a of the pressing roll 5 by pressing the pressing means 1.
By pressing in the opposite direction to the pressing direction by 3, the elastic deformation of the pressing roll 5 is reduced and the line contact pressure of both rolls 5 and 6 is made uniform in the longitudinal direction of the rolls.

Here, a specific example of the pressing force control of both the rolls 5 and 6 will be explained. For example, the hydraulic pressure is applied to the hydraulic cylinder 15 so that a flat parallel pressure contact surface "b" having a size of 1111111 or more when viewed in the axial direction is formed at the pressure contact portion of the rolls 5.6 by elastic deformation of the rolls. and adjust the hydraulic pressure to the hydraulic cylinder 17 so that the parallel pressure contact surface is uniform along the longitudinal direction of the roll 56.

The molten metal supply device 2 includes a long nozzle 22 disposed above the molten metal furnace 21 and the pressing and fixed rolls 5 and 6, and a supply that communicates the nozzle 22 with the melting furnace 21. The nozzle 22 and the supply pipe 2
3 constitutes a siphon tube.

The molten metal furnace 21 has a structure in which a furnace body 21a made of a heat-resistant material is surrounded by a heating tA21b made of a heater or an induction coil.
is accommodated. In addition, the nozzle 22 and the supply pipe 2
3 is alumina and quartz.

Alternatively, it is made of a heat-resistant material such as boron tinide (BN). A discharge port 22a is formed at the lower end of the nozzle 22, and an argon gas supply device 24 is connected to the upper end of the discharge port 22a. Furthermore, the supply pipe 2
3 is inserted into the molten metal furnace 21, and a vacuum pump 26 is connected to the branch portion 23a of the supply pipe 23 via a negative pressure passage 27. Also, this negative pressure passage 27
A vacuum gauge 25a and an on-off valve 25b are interposed therein, and a shank 23b is disposed in the middle of the supply pipe 23.

Next, a case will be described in which a quenched ribbon is manufactured using the manufacturing apparatus of this embodiment.

(2) First, an alloy material is charged into the furnace body 21a and melted, and the molten metal is maintained at a temperature slightly higher than its melting temperature (for example, +50° C.). In addition, the pressure roll 5. The fixed rolls 6 are each rotated inwardly, and the cooling rolls 9a, 9b.

The polishing roll 12 is driven to rotate. Furthermore, the pressing means 13 applies a predetermined pressure to the pressing roll 5 to urge the fixed roll 6, and the correcting means 14 corrects the elastic deformation of the pressing roll 5, thereby causing the line contact pressure between the two rolls 5 and 6. equalize.

(2) Next, a portion of the supply pipe 23 is closed with a shutter 23b, and the vacuum pump 26 is activated. Then, the inside of the supply pipe 23 is suctioned to a negative pressure, and the molten alloy a inside the furnace body 21a rises inside the supply pipe 23. Here, depending on the degree of vacuum in the supply pipe 23, the height Hl from the molten metal surface in the furnace body 21a to the molten metal surface in the supply pipe 23, and the height from the discharge port 22a of the nozzle 22 to the molten metal surface in the furnace body 21a. SaH2
The sum H3 changes (see Figures 3 and 4).

The larger this H3 is, the greater the amount of molten metal discharged.

(2) In this state, open the shutter and supply argon gas into the nozzle 22. As a result, the molten alloy a
is introduced into the discharge port 221 from the supply pipe 23 through the nozzle 22, and is supplied between the pressing and fixed rolls 5 and 6. Then, the molten alloy a is rolled while forming a pool and being rapidly solidified at the contact area with both rolls 5.6.
As a result, the quenched ribbon A is continuously produced.

According to this embodiment, the molten metal furnace 21 containing the molten alloy a and the nozzle 22 are communicated through the supply pipe 23, and the molten alloy a in the molten metal furnace 21 is pressed through the supply pipe 23. Since it was designed to be supplied between fixed rolls 5 and 6, melting furnace 2
By freely selecting the capacity of 1 as required, the capacity of molten alloy can be greatly increased and continuous supply can be realized.

Therefore, it is possible to eliminate the problem of interruption in the supply of molten metal, which occurs when a small amount of alloy material is conventionally charged into a nozzle, and it is possible to perform continuous operation and improve productivity.

In addition, in this embodiment, the supply pipe 23 is
By suctioning the inside to negative pressure, the discharge port 2 of the nozzle 22
Since the supply amount of the molten alloy can be controlled simply by adjusting the height H3 from 2a to the molten metal surface in the supply pipe 23, the accuracy of the supply amount can be improved and variations in the shape 9 dimensions of the quenched ribbon A can be reduced.

Furthermore, according to this embodiment, the pressing and fixed rolls 5.6 are cooled by the cooling rolls 9a and 9b, and both rolls 5.6
Since the deposits are removed by the polishing roll 12,
It is possible to suppress the temperature rise of the pressing and fixed rolls 5 and 6, and also to avoid the adverse effects of deposits on the ribbon, and from this point of view as well, continuous production of the quenched ribbon can be realized.

In the above embodiment, a case where a molten alloy was created in a molten metal furnace was explained as an example, but in the present invention, a molten alloy that was separately melted may be supplied to a molten metal furnace.

In addition, in the above embodiment, the center of the nozzle 22 is aligned with the center of both rolls 5 and 6, but if splashing of the molten metal becomes a problem, two points ii! As shown by im, the two centers may be shifted and the molten metal may be supplied onto the roll once.

〔Effect of the invention〕

As described above, according to the apparatus for manufacturing a quenched ribbon or a quenched small diameter wire according to the present invention, the molten metal furnace and the nozzle are communicated with each other through the supply pipe, and the inside of the supply pipe is suctioned to a negative pressure, thereby increasing the siphon pipe. The principle is that the molten alloy is continuously supplied from the nozzle, which has the effect of increasing productivity by enabling continuous operation without interrupting the production of the quenched ribbon, as well as being able to control the amount of molten alloy supplied at a constant level. This has the effect of avoiding variations in the shape of thin strips, etc.

[Brief explanation of drawings]

1 to 6 are diagrams for explaining an apparatus for manufacturing a quenched ribbon according to an embodiment of the present invention, in which FIG. 1 is a schematic configuration diagram thereof, and FIG. 2 is a schematic diagram showing its twin roll device. A perspective view, FIG. 3 is a schematic configuration diagram showing the molten metal supply apparatus, and FIG. 4 shows the degree of vacuum and the molten alloy A is a rapidly quenched ribbon.

Claims (1)

[Claims] (1) In an apparatus for manufacturing a quenched ribbon or a quenched fine diameter wire by rapidly cooling and solidifying a molten alloy using a pair of rolls that rotate inwardly from each other, a molten metal furnace disposed near the rolls and a molten metal furnace disposed in the vicinity of the rolls; A supply pipe is connected to the nozzle in the form of a siphon tube, and a vacuum pump is connected to the supply pipe to suck the inside of the supply pipe to a negative pressure. An apparatus for producing a quenched thin ribbon or a quenched fine diameter wire, characterized in that a molten alloy is continuously supplied while adjusting the height.