JP4016794B2 - Liquid metal quenching equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metal ribbon manufacturing apparatus including amorphous metal and crystalline ribbon.
[0002]
[Prior art]
As one method for producing a metal foil strip, molten metal (hereinafter also referred to as molten metal) is sprayed from a nozzle of a nozzle container toward the outer peripheral surface of a rotating cooling body that rotates at high speed, and rapidly cooled and solidified in a ribbon shape or a tape shape. A method is known and this method is called a liquid quenching method. This method is classified into a single roll method, a twin roll method, a centrifugal quenching method, and the like depending on the type of the rotating cooling body. By these methods, a metal ribbon can be obtained by appropriately selecting the components, composition, cooling conditions, etc. of the molten metal (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-52002 (page 1-2, FIG. 1)
[0004]
By the way, the production of the metal ribbon by the liquid quenching method may be performed in the atmosphere depending on the metal component to be produced, or may be performed in an inert gas such as argon, helium or nitrogen, or in a vacuum. In particular, if the metal ribbon to be produced is easily oxidized, in other words, if the activity is high, it is essential to manufacture in an inert gas or vacuum atmosphere in order to prevent oxidation or spontaneous ignition.
A conventional typical manufacturing apparatus is shown in FIG.
FIG. 3 is a side sectional view of a production apparatus for producing a metal ribbon in an inert gas or in vacuum by a single roll method. In the figure, 1 is a metal raw material, 1a is a molten metal, 1b is a metal ribbon, 4 is a chamber, and 5 is a rotating cooling body. 6 is a high frequency coil for heating and melting the metal raw material 1, 7 is a storage container for storing the metal raw material 1 or the molten metal 1a, and 7a is a nozzle for injecting the molten metal 1a. 8 is an elevating mechanism for raising and lowering the storage container 7 and the nozzle, 9 is a pressurized gas introduction pipe for injecting molten metal, 9a is an injection gas valve, 10 is a leak adjustment valve, and 11 is a sample recovery unit.
In this liquid metal quenching apparatus, a rotary cooling body 5, a high-frequency coil 6, and a heat-resistant storage container 7 that also serves as a melting crucible are accommodated in a chamber 4. Then, the metal raw material 1 for melting is charged into the storage container 7, the storage container 7 is connected to the pressurized gas introduction pipe 9 for molten metal injection, and the storage container 7 is rotated by the elevating mechanism 8. Prepare to descend directly above. Next, the injection gas valve 9a and the leak adjustment valve 10 are closed and exhausted from the chamber 4, and after the inside of the chamber 4 reaches a predetermined degree of vacuum, the rotary cooling body 5 is rotated to a necessary peripheral speed, High frequency melting of the metal raw material 1 in the storage container 7 is performed. After the melting of the melting metal raw material 1 is completed, the elevating mechanism 8 is driven to lower the storage container 7 directly above the rotating cooling body 5. At the same time, the injection gas valve 9 a is opened, and the molten metal 1 a inside thereof is injected from the storage container 7 toward the outer peripheral surface of the rotary cooling body 5 with an inert gas such as argon gas, helium gas or nitrogen at an appropriate pressure. . Then, the molten metal 1 a is cooled by the rotating cooling body 5 and becomes a metal ribbon 1 b and flies to the sample recovery unit 11. The metal ribbon 1b is manufactured in a vacuum as described above. Further, by introducing an inert gas such as argon, helium or nitrogen into the chamber 4 through the leak adjustment valve 10, the metal ribbon 1b can be manufactured in an inert gas atmosphere.
[Problems to be solved by the invention]
However, this conventional liquid metal quenching apparatus has a problem that the molten metal is ejected mainly by visual inspection of the molten metal state, and the quality of the metal ribbon is not stable and requires skill in operation.
SUMMARY OF THE INVENTION The present invention solves these problems, and an object of the present invention is to provide a liquid metal quenching apparatus in which a stable quality metal ribbon can be obtained with a good yield and is excellent in operability.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, the present invention has the following configuration.
The invention according to claim 1 is a chamber that can be evacuated, a rotary cooling body that rotates at a high speed therein, a storage container that stores a raw metal, a nozzle that is provided below the storage container, and the raw metal Heating means for heating and melting, a jet gas valve for applying an inert gas pressure to the storage container, and a control means for injecting molten metal from the nozzle of the storage container toward the rotary cooling body, In the liquid metal quenching apparatus for rapidly cooling and solidifying the molten metal to obtain a thin metal body, the control means includes a light emitting element provided on a straight line across the nozzle and a light receiving element for detecting light of the light emitting element. A signal processing circuit for processing the signal of the light receiving element, and the signal processing circuit is configured to receive the light receiving element when the heated and melted raw metal falls in the tip direction of the nozzle due to a wetting phenomenon. Quantity is a time point of reduction to is obtained by a circuit for injecting the molten metal by opening the valve for the injection gas to the rotating cooling body by the detection signal.
According to this configuration, when a signal processing circuit receiving element signal decreases, since the circuit enters the operation start ejecting molten metal, without requiring skill for operation can be automated, stable quality The metal ribbon can be obtained.
The invention according to claim 2 is a chamber capable of being evacuated, a rotary cooling body that rotates at a high speed provided therein, a storage container that stores a raw metal, a nozzle provided at a lower portion of the storage container, and the raw metal A heating means for heating / dissolving the storage container, an elevating mechanism for moving the storage container and the nozzle up and down, a jet gas valve for applying an inert gas pressure to the storage container, and a nozzle of the storage container from the nozzle toward the rotary cooling body. A liquid metal quenching apparatus for obtaining a metal thin body by rapidly cooling and solidifying the molten metal.
The control means includes a light emitting element provided on a straight line across the nozzle, a light receiving element that detects light of the light emitting element, and a signal processing circuit that processes a signal of the light receiving element, and the signal processing The circuit detects when the amount of light to the light receiving element decreases when the heated and melted raw metal falls in the tip direction of the nozzle due to a wetting phenomenon, and drives the lifting mechanism by the detection signal to store the storage The container is lowered to a position directly above the rotary cooling body, the injection gas valve is opened, and the molten metal is injected onto the rotary cooling body.
According to this configuration, since the signal processing circuit is a circuit that starts the operation of injecting molten metal when the light receiving element signal decreases, it can be automated and does not require skill for operation, and has stable quality. A metal ribbon is obtained.
According to a third aspect of the present invention, the signal processing circuit is provided with a delay timer that delays the operation of opening the injection gas valve for a predetermined time when detecting a signal that reduces the amount of light to the light receiving element.
According to this configuration, since the signal processing circuit is a circuit that operates the delay timer that delays the start of molten metal ejection when the signal of the light receiving element decreases, the ejection start can be adjusted according to the state of the molten metal.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side sectional view of a liquid metal quenching apparatus showing an embodiment of the present invention. In the figure, 2 is a light emitting element made of a semiconductor laser, and 3 is a light receiving element. The other reference numerals are the same as those in the conventional example, and thus description thereof is omitted.
Before the sample preparation, the inside of the vacuum chamber 4 was evacuated to 1 × 10 ⁻³ Pa in advance, and then the sample was prepared by filling with argon gas. The sample inserted into the storage container 7 is heated by the high frequency coil 6.
In the present invention, as shown in FIG. 2A, the tip of the storage container 7 is irradiated with laser light from the light emitting element 2 of the semiconductor laser, and the light receiving element 3 detects the amount of light. The sample heated by the high-frequency coil 6 becomes the molten metal 1a, and a part of the sample falls due to wetting at the tip of the nozzle 7a and blocks the laser beam. Accordingly, the amount of light incident on the light receiving element is reduced. This is as shown in FIGS. 2 (b) and 2 (c). After this reduced moment or an appropriate time t seconds is counted by a delay timer (not shown), the elevating mechanism 8 is driven to lower the storage container 7 directly above the rotary cooling body 5 and at the same time, the injection gas valve 9a is opened, and the molten metal in the inside is injected from the storage container 7 toward the outer peripheral surface of the rotary cooling body 5 with an inert gas such as argon gas, helium gas or nitrogen at an appropriate pressure. Then, the metal ribbon 1b flies to the sample recovery unit 11. As described above, the metal ribbon is manufactured in a vacuum.
According to the present embodiment, it is possible to automate the ejection timing, which has conventionally relied on visual observation, and to obtain a metal ribbon having a uniform quality with a high yield.
In the present embodiment, the automation of the apparatus has been described as an example. However, a great effect can be obtained in terms of improving operability. That is, when a small amount of metal ribbon is experimentally produced, there is an effect that an operator who is not supposed to grasp the timing of metal melting can easily produce the metal ribbon. In such a case, it is preferable to turn on the lamp so that the worker can understand when the signal of the light receiving element decreases. Furthermore, if such a signal is obtained, it is very effective when the quartz nozzle 7 is made of opaque quartz.
[0007]
【The invention's effect】
(1) Since the molten metal starts to be ejected when the signal of the light receiving element decreases in the molten state of the metal raw material , it is possible to automate and obtain a stable quality metal ribbon without requiring skill in operation .
(2) Since the signal processing circuit starts the molten metal ejection operation when the signal of the light receiving element decreases , it does not require any skill in operation and can be automated and a stable quality metal ribbon can be obtained.
(3) Since the signal processing circuit is a circuit that operates a delay timer that delays the start of molten metal ejection when the signal of the light receiving element decreases, the ejection start can be adjusted according to the state of the molten metal.
[Brief description of the drawings]
FIG. 1 is a schematic view of a liquid metal quenching apparatus according to the present invention.
FIG. 2 is a schematic diagram showing the principle of a liquid metal quenching apparatus according to the present invention.
FIG. 3 is a schematic view of a liquid metal quenching device in a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Metal raw material 1a Molten metal 1b Metal ribbon 2 Light emitting element 3 Light receiving element 4 Chamber 5 Rotating cooling body 6 High frequency coil 7 Storage container 7a Nozzle 8 Nozzle raising / lowering mechanism 9 Pressurized gas introduction pipe 9a for molten metal injection Injected gas valve 10 Adjustment valve 11 Sample collection part

Claims (3)

A chamber capable of being evacuated, a rotating cooling body that rotates at a high speed provided therein, a storage container that stores the raw metal, a nozzle that is provided below the storage container, and a heating means that heats and melts the raw metal An injection gas valve for applying an inert gas pressure to the storage container, and a control means for injecting the molten metal from the nozzle of the storage container toward the rotary cooling body, and rapidly cooling and solidifying the molten metal. In a liquid metal quenching device to obtain a thin metal body,
The control means includes a light emitting element provided on a straight line across the nozzle, a light receiving element that detects light of the light emitting element, and a signal processing circuit that processes a signal of the light receiving element, and the signal processing The circuit detects when the amount of light to the light receiving element decreases when the heated and melted raw metal falls in the direction of the tip of the nozzle due to a wetting phenomenon, and opens the injection gas valve according to the detection signal to open the molten metal A liquid metal quenching device characterized in that a circuit for injecting metal onto a rotating cooling body is provided. A chamber capable of being evacuated, a rotating cooling body that rotates at a high speed provided therein, a storage container that stores the raw metal, a nozzle that is provided below the storage container, and a heating means that heats and melts the raw metal An elevating mechanism for elevating and lowering the storage container and the nozzle, an injection gas valve for applying an inert gas pressure to the storage container, and control means for injecting molten metal from the nozzle of the storage container toward the rotary cooling body In a liquid metal quenching apparatus that obtains a thin metal body by rapidly cooling and solidifying the molten metal,
The control means includes a light emitting element provided on a straight line across the nozzle, a light receiving element that detects light of the light emitting element, and a signal processing circuit that processes a signal of the light receiving element, and the signal processing The circuit detects when the amount of light to the light receiving element decreases when the heated and melted raw metal falls in the tip direction of the nozzle due to a wetting phenomenon, and drives the lifting mechanism by the detection signal to store the storage A liquid metal quenching apparatus comprising a circuit that lowers a container to a position directly above the rotating cooling body, opens the injection gas valve, and injects the molten metal onto the rotating cooling body.   3. The delay circuit according to claim 1, wherein the signal processing circuit includes a delay timer that delays an operation of opening the injection gas valve for a predetermined time when a signal for reducing the light amount to the light receiving element is detected. Liquid metal quenching device.

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