JPS5937707B2 - Nozzle for amorphous metal production - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in nozzles used in the production of amorphous metals.

In recent years, amorphous metals obtained by extremely rapidly solidifying certain alloy materials from a molten state have attracted attention as having excellent strength and corrosion resistance, as well as good magnetic properties.

A method for manufacturing such amorphous metal is to continuously jet and supply a molten metal material through a micro-gap slit in a nozzle onto the surface of a cooling body such as a cooling roll that moves at high speed. A method of solidifying at a rate of about 105° C./sec or more is generally known.

However, with this method, the slit of the nozzle that spouts molten metal must be machined with high precision in order to keep the thickness of the product constant, which affects the cooling rate. It is difficult to select a material with good workability, and when cutting a slit with a slitter, the slit is 1. There was a problem in that it was difficult because the gap was small, on the order of mm or less.

From this point of view, the present invention aims to overcome the poor workability of ceramic materials, which have excellent wear resistance and volume stability against thermal changes, by forming the side wall surfaces of the slit into open outer surfaces. This facilitates high-precision processing through mirror polishing and improves dimensional accuracy.In order to open the slit side wall surface, two or more nozzle chips with slit openings are used. It is made up of divided bodies.

The present invention will be described below based on embodiments shown in the drawings.

In FIG. 1, A9, 1 and 2 are divided bodies having a substantially semicircular shape with the same left and right sides forming the nozzle tip, and opposing faces 3 and 4, which are divided surfaces forming an approximately diameter line, are stepped. , and are provided so as to form a slit opening 9 in a small gap in the center by opposing abutment.

That is, in the left and right divided bodies 1 and 2, the protrusion 5 or 6 on one end side provided on the opposing surfaces thereof is connected to the opposing surface 3 of the other divided body.
, 4 By abutting against each other, the left and right opposing surfaces 3,
4 and a slit opening 9 surrounded by stepped shoulders 7, 8
is formed.

The opening in Figure 1 shows a state in which a nozzle tip consisting of the left and right divided bodies 1 and 2 is assembled to the tip of the nozzle body 10, with the semicircular base of the nozzle tip divided body 1. The nozzle body 10 is formed into a tapered shape with a larger diameter, and is fitted into a tapered surface 101 formed opposite to each other on the inner surface of the tip end of the nozzle body 10, thereby achieving a stable fitting.

According to such a configuration, each surface surrounding the slit 9 of the nozzle tip becomes an open outer surface of each divided body.
Even if materials such as high-purity alumina and silicon nitride are used that have excellent wear resistance but poor workability, high dimensional accuracy can be obtained by mirror-finishing the side walls of the slit, and processing yields are also significantly improved. This has the advantage that the width of the slit and the narrow side walls of the slit can be precisely machined compared to the conventional case where a slit opening is formed in an integrated nozzle using a slitter or the like.

It goes without saying that the slit opening may have a trapezoidal cross section.

In addition, according to the same configuration, the nozzle body can be made of relatively inexpensive refractories such as alumina/graphite molten stone, and by rubbing these joint surfaces together, leakage of molten metal can be sufficiently prevented. Since it can be prevented, its practicality is extremely high.

Figure 2 A 2, C, 2 shows another example in which high-precision machining of the open side wall surface surrounding the slit is facilitated by a combination of multiple rectangular plate-shaped divided bodies, and A is a rectangular plate. and a flat plate with a recessed slit opening, a combination in which a pair of small pieces forming both sides of the width of the sulin 1 to the opening are held between the opposing surfaces of a pair of left and right rectangular flat plates, and C is 4.
2 shows a combination of rectangular flat plate blocks, and 2 shows a combination in which the nozzle chip division body shown in FIG. 1 is a rectangular flat plate.

With these combinations, the side wall surface of the slit opening is an open plane in each of the slits of the nozzle tip formed, making it possible to obtain a high degree of dimensional accuracy through mirror finishing. It has also become possible to use materials with excellent wear resistance.

Further, as for the one shown in Figure 2, the advantage is that the width of the slit can be arbitrarily set.

In addition, in the example shown in FIG. 3 A1, the nozzle has a cylindrical cross section and is constituted by half-cylindrical divided bodies 11 and 12 having the same shape on the left and right sides, and these half-cylindrical divided bodies 11,
12 is formed with a recess 13° 14 forming a slit opening 17 at the lower end side of the facing optical surface, and at the upper end side there are a plurality of recesses 13° 14 for introducing molten metal into the nozzle tip from the nozzle body 18. Semicircular holes 15° and 16 are formed for forming round holes.

Incidentally, a stepped plug (not shown) having a flat or in-cylinder fitting portion that closes both ends of the nozzle tip, which has a cylindrical cross section, is attached to both ends of the nozzle tip.
The left and right divided bodies 11 and 12 are provided so as to be pressed into engagement with the arc-shaped end opening of the nozzle body 18.

According to such a configuration, similarly to the embodiments described above, since the side wall surface of the slit opening 17 is open, the slit opening 17 can be processed with high accuracy and high dimensional accuracy by mirror finishing. In addition to being able to process, for example,
It has the advantage of being able to use materials such as high-purity alumina and silicon nitride, which have excellent wear resistance and volume stability, but have poor workability.

Note that the nozzle body does not have such processing difficulties and does not require high dimensional accuracy, so refractories such as oxides, carbides, nitrides, and composites thereof can be used.

As described above, the nozzle for manufacturing amorphous metal according to the present invention has volume stability and wear resistance under the manufacturing conditions, even if the material is difficult to cut for the slit opening for spouting molten metal. It is possible to greatly expand the applicability of materials with excellent properties, etc., and the practical benefits are extremely significant.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and are shown in FIG.
The mouth shows an example in which a disk-shaped nozzle tip is constructed by combining two parts, and FIG. Figures 2A, 2C and 2 each show an example in which a rectangular flat nozzle chip is constructed by a combination of two or more divided bodies. Figure 3 A shows an example in which a nozzle tip with a cylindrical cross-section is constructed by combining two parts; A is a bottom view of the nozzle chip, and the opening is a vertical sectional view showing the state in which it is assembled to the nozzle body. It is. 1.2...Divided body, 3,4...Diameter part, 5,6...Protrusion part, 7,8...Stepped shoulder part, 9...Slit opening, 10...
Nozzle body, 101...Tapered surface, 11,1
2... Divided body, 13, 14... Concavity,
15.16... Semicircular hole, 17... Slit opening, 18... Nozzle body.

Claims (1)

[Claims] 1. A nozzle or nozzle tip having a slit opening for spraying and supplying molten metal to the surface of the cooling body is constructed by a combination of two or more divided bodies, and each side wall surface surrounding the slit opening is an open outer surface of the divided body. A nozzle for manufacturing amorphous metal characterized by the following.