JPS6225460B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ribbon manufacturing apparatus for forming a thin ribbon by ultra-quenching difficult-to-process magnetic materials or semiconductor materials such as Sendust and Alperm from a molten state.

Conventionally, high permeability magnetic materials such as Sendust and Alperm have been used as materials for magnetic head cores due to their excellent magnetic properties, but on the other hand, they have high mechanical hardness and brittleness. Because of this, machinability is poor, and for this reason, there is a problem in that the yield rate is poor and the cost is extremely high when cutting the core by cutting. As a method to solve this problem, a method has been proposed in which the material is heated and molten, then jetted between twin rolls rotating at high speed or onto a single roll to ultra-quench the material and turn it into a thin ribbon. Conventional equipment used in this method is shown in FIG. In FIG. 1, 1 is a heating device, 1a is a heating tube, 1b is a heater, and 2a and 2b are twin rolls. According to this device, the material 3 is heated and melted by the heater 1b in an atmosphere of an inert gas such as Ar gas or a reducing gas such as hydrogen gas in the heating tube 1a,
Thereafter, by increasing the gas pressure in the tube 1a, the molten material 3 can be jetted from the nozzle 1c between the rolls 2a, 2b, rapidly rolled, and made into a thin ribbon. However, in this device, when manufacturing a ribbon in the atmosphere, if the material 3 in the heating tube 1a melts and accumulates in the nozzle 1c, Ar gas and other antioxidant gases will flow to the exit side of the nozzle 1c. Therefore, outside air enters the inside from the outlet of the nozzle 1c and oxidizes the molten material 3, and the outlet of the nozzle 1c is blocked by the oxidized material 3, making it impossible to eject the material. I had a problem with getting used to it.

Therefore, as a means to solve the above problem, the second
We have developed the apparatus shown in Figures and Figure 3.

In the following, this device will be described. The characteristic feature of this device is that a gas guide cylinder 4 is enclosed around the outer periphery of the lower half of the heating tube 1a. By circulating a reducing oxidation-preventing gas, this oxidation-preventing gas is introduced into the nozzle 1c from the outlet side when the material 3 is melted, thereby blocking the oxidizing outside air and preventing the oxidation of the material 3. That's what I did.

To explain the operation of this device, first, move the heating tube 1a so that the gas guide tube 4 is in the position shown in FIG.
is placed in the raised position, and Ar is applied to the heating tube 1a and this gas guide tube 4 from their respective gas inlet ports 1d and 4a.
The material 3 is heated and melted by the heater 1b while gas and other antioxidant gases are being introduced, and then the heating tube 1a is passed through the rolls 2a and 2b as shown in FIG.
The roll 2 rotates the molten material 3 at high speed by increasing the gas pressure in the heating tube 1a.
The material is jetted from the nozzle 1c between the rollers 2a and 2b, and the material is rapidly rolled by the rolls 2a and 2b to form a thin ribbon.

By the way, although the Ar gas supplied to the above-mentioned device from the gas inlet 4a is ejected toward the nozzle 1c, it is also ejected toward the heating device 1 since the upper part is open.

For this reason, there is a problem that the inside of the heating device 1 is cooled by the Ar gas, resulting in a decrease in thermal efficiency.At the same time, the amount of Ar gas ejected to the nozzle 1c side is reduced, so it is not possible to eject the molten material efficiently. In addition to not being able to do this, there was also the problem that Ar gas was wasted.

The present invention solves the above-mentioned problems, and provides a ribbon manufacturing apparatus that can prevent nozzle clogging, prevent oxidation of ejected material, and effectively utilize antioxidant gas and improve efficiency. It is in.

Embodiments of the present invention will be described below with reference to FIG.

Note that the same reference numerals as in the conventional example described above indicate the same parts, and the explanation will be omitted.

In this embodiment, a rib 1e is provided on the outer periphery of the heating tube 1a at an intermediate position, and when the heating tube 1a is lowered, the upper end opening edge of the gas guide tube 4 is exposed to the rib 1e.
It is designed so that it comes into contact with the In this embodiment, when heating and melting the material 3, the gas guide pipe 4 is connected to the nozzle 1c in the same way as shown in FIG.
The outlet of the nozzle 1c is filled with antioxidant gas to prevent oxidation of the molten material, and when the material 3 is spouted, the heating tube 1a is filled as shown in FIG.
is lowered to close the upper end of the gas guide tube 4 with the rib 1e, and the antioxidant gas introduced into the gas guide tube 4 is jetted from the lower end opening around the outlet of the nozzle 1c, and the gas is jetted out. In this way, the molten material 3 jetted from the nozzle 1c to the rolls 2a, 2b is cooled and oxidized.

In the present invention, as described above, the gas guide tube is wrapped around the nozzle of the heating device that moves up and down, and the inert or reducing antioxidant gas is supplied into the gas guide tube. This prevents the molten material inside the nozzle from being oxidized by the oxidizing outside air entering from the nozzle outlet side.Furthermore, a closing rib is formed at the middle part of the outer circumference of the heating tube, thereby preventing the gas guide from being oxidized. Since the opening at one end of the tube is closed, it is possible to prevent the antioxidant gas from blowing out into the heating device, thereby preventing the inside of the heating device from being cooled, thereby improving thermal efficiency. In addition, since all the gas supplied into the gas guide tube is ejected from the nozzle side, it is possible to eliminate waste of gas, and by increasing the efficiency of the ejected amount, cooling is achieved in conjunction with rapid cooling by the rolls. The speed can be improved, which makes it possible to manufacture ribbons with fine grains. The present invention can also be applied to a ribbon manufacturing apparatus in which the outer circumferential surface of a single roll or the inner circumferential surface of a cylindrical cup is used as a moving surface.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the conventional example, Figures 2 and 3 are improved examples of the conventional example, Figure 2 is a cross-sectional view when the material is heated, and Figure 3 is the cross-sectional view when the material is rapidly cold rolled. 4 are sectional views of a ribbon manufacturing apparatus showing an embodiment of the present invention. 1...Heating device, 1a...Heating tube, 1b...Heater, 1c...Nozzle, 1d...Gas inlet, 1
e...Closing rib, 2a, 2b...Roll, 3...
...Material, 4...Gas guide pipe, 4a...Gas inlet.

Claims (1)

[Claims] 1. In an apparatus for manufacturing a ribbon by heating and melting a ribbon material onto a roll surface, ejecting the material, and rapidly cooling the material by the roll surface to solidify it as a whole, a heating device for heating and melting the ribbon material is used. The heating tube is supported so that the nozzle at its tip can freely approach and separate from the roll, and a gas guide tube is fitted around the outer periphery of the heating tube corresponding to the nozzle. A closing rib is formed in the section, and the length of the gas guide tube is set so that, when the heating tube approaches the roll, one open end of the tube is in contact with the closing rib, and the other open end is connected to the closing rib. 1. A ribbon manufacturing device characterized by having a length such that an inert or reducing antioxidant gas is ejected at a nozzle tip.