JPH0833956A - Molten metal container of continuous casting device of very thin wire - Google Patents

Abstract

PURPOSE: To facilitate exchange at every interruption of casting by constituting the front end of a die of a disk independent from a container, which disk has a through- hole and freely attachably and detachably pressing the disk to the bottom of the container. CONSTITUTION: This container 1 houses molten metal, has a cap 3 for hermetic closing, has a die of which the final bore determines the diameter of the wire at the terminal of its bottom and is used for the apparatus for continuously casting the extremely small-diameter wire directly from the molten metal. At the front end of the die is composed of the disk 8 which is independent from the container 1. The disk 8 has a through-hole 9 and the container 1 has a means of freely attachably and detachably pressing the disk 8 to the terminal at the bottom of the container 1. The means for pressing the disk 8 to the terminal at the bottom of the container 1 comprises a supporting body 10 which is the housing part of the disk and the means for applying perpendicularly and upwardly facing return force to the supporting body comprises screw rods 18 and 19, bottom washers 20 and 21 at their bottom ends, apex washers 26 and 27 and springs 24 and 25 for exerting force to the upper side surface of the cap 3 and the base surface of the bottom washers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for directly continuously casting a very fine wire from molten metal.

[0002]

2. Description of the Related Art A method has been developed for producing an extremely thin wire (up to about 80 .mu.m) having a substantially circular cross section directly from molten metal to an infinite length. This method is described in European Patent No. 39,1.
No. 69. In this method, a jet of metal is made from a container of molten metal that has an exit orifice that acts as a die, the end diameter of which is equal to or slightly larger than the diameter of the desired wire, and a heating means, and this metal jet is then fed to the wire. It is put in a layer of a cooling liquid to be solidified, for example, water or an aqueous solution of a salt such as sodium chloride, magnesium chloride or zinc chloride. This layer of cooling fluid is moving across the metal jet. This layer of cooling liquid flows over the solid surface.
The movement of the solid surface is given to the cooling liquid. This solid surface can consist of the inner part of a rotating drum (EP 39,169) or the horizontal or curved part of a grooved belt rotating in a loop (EP 89,134). During casting, the wire is wound by a centrifugal force inside the rotating drum or on the outside of the casting machine in a pobbin.

Since this method has a high cooling rate, it is possible to manufacture an amorphous wire of uniform size having extremely high tensile strength characteristics when it becomes an amorphous metal.
Amorphous wires of alloys based on various metals such as cobalt, gold and aluminum can be cast.

The most important part of this casting machine is the container containing the molten metal, in particular its exit orifice. That is, in order to produce a wire of practically continuous and stable dimensions with this casting method, the exit orifice quickly corrodes.
It is clear that it must not be eroded and, conversely, cannot be blocked by impurities. The impurities may be non-metal impurities originally contained in the solid metal charged into the container as a raw material, or may be generated by erosion of the refractory material forming the inner wall of the container. Therefore, the service life of the outlet orifice is much shorter than the rest of the container.

Most modern containers consist of a monoblock tapering toward the bottom (see, for example, EP 39,169), the exit orifice (die) being formed by a simple hole. It is also proposed that a conical accessory with an outlet orifice is fixed to the bottom of the container (see WO 92/21460). However, in either case, if the die is clogged or eroded, the entire container must be replaced, which increases the casting cost.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a molten metal container for a direct wire continuous casting machine in which the service lives of the die and other parts of the container are completely independent of each other.

[0007]

SUMMARY OF THE INVENTION The present invention provides a method for removing molten metal containing a molten metal, having a sealing lid, and having a bottom end with a die whose final inner diameter determines the diameter of the wire. In a container used in an apparatus for direct continuous casting of thin wire into a container, at least the tip portion of the die is composed of a disk independent of the container, the disk having a through hole, the disk being the bottom end of the container. There is provided a container having a means for detachably pressing the container.

[0008]

The present invention uses a disc (which is perforated) independent of the container as the die (or at least the tip element of the die). The disc is pressed against the bottom end of the container by the holding means.
This disc can be easily replaced, if necessary, after each interruption of the casting, and the rest of the container can be used without being replaced until the wear exceeds the permissible value. Hereinafter, the present invention will be described with reference to the accompanying drawings.

[0009]

EXAMPLE A container 1 of the embodiment of the present invention shown in FIGS. 1 (a) and 1 (b) is a substantially cylindrical container made of a refractory material (silica glass or the like), and a bottom end thereof has a hemispherical portion 2. ing. A metal to be cast is housed in the container 1 (FIG. 1 (a) shows a cross section in the longitudinal direction) and is sealed by a lid 3. The lid 3 is formed with a passage 4 for introducing a neutral gas into the container 1. The role of this neutral gas is to inactivate the atmosphere in contact with the molten metal during casting and to generate a pressure of several bars for pushing the molten metal out of the vessel 1. As shown in FIG. 1, a heating means such as an induction coil 5 surrounds the container 1 at a height where the molten metal is contained. This heating means serves to melt the metal that is placed in the container 1 in a solid state before casting, heats the obtained molten metal to a predetermined temperature, and maintains that temperature.

At the bottom end of the container 1 is a die from which molten metal flows out. Part of this die consists of a cylindrical hole 6 in the bottom of the container 1. The diameter of this hole 6 is a few millimeters, preferably 0.5 to 1 mm. A flat support portion 7 is formed around the outer outlet of the hole 6 and on the outer wall of the container 1, and the disk 8 forming the tip portion of the die is in contact with this support portion 7.

The disk 8 is, for example, cylindrical and has an outer diameter of, for example, about 3 to 10 mm and a thickness of about several millimeters (preferably 0.5 to 2 mm). A hole 9 having a diameter equal to or slightly larger than the diameter of the ultrafine wire to be cast is formed in the center of the disk 8.
The disk 8 is made of a material having a high hardness that can withstand the pressure exerted by the metal contained in the container 1 and the abrasion caused by the flow of the molten metal for a sufficiently long time.
The material should also have low reactivity to metals and strong thermal shock resistance. The disk 8 used to cast the iron alloy is, for example, a disk made of a sintered ceramic such as stabilized zirconia or a composite material of the Sialon type, boron nitride or a composite material based on boron nitride (for example, zirconia / boron nitride). It is possible to use a disc obtained by machining from the mixture) or a disc obtained by cutting a ceramic tube obtained by extrusion.

This disk 8 must be pressed with a maximum degree of sealing against the flat support 7 of the container 1 in order to prevent leakage of the molten metal from the contact area. Also, the holes 9 in the disk 8 must be centered in the best possible manner with respect to the longitudinal axis of the container 1. Therefore,
It is important to use means to accurately position and hold the disk 8. In the embodiment shown in FIGS. 1 (a) and 1 (b), the means for precisely positioning and holding the disk 8 comprises a support 10 having a thickness of a few millimeters, which support 10 has a circular central part. It is composed of 13 and two side arms 11 and 12 connected to it.

The central portion 13 has a countersink 14 formed by deep counterboring. The upper part of the countersink 14 defines a storage part for the disk 8. The housing has dimensions suitable for housing the disc 8, its diameter being equal to the diameter of the disc 8 and its depth being slightly shallower than the thickness of the disc 8 so that the upper surface of the disc 8 is It is adapted to abut the flat support 7 of the container 1. A cylindrical hole having a larger diameter than the hole 9 of the disk 8 and substantially coaxial with the hole 9 is formed at the bottom of the countersink hole 14.

Preferably, a horizontal hole 15 extending horizontally is formed in the circular center portion 13 of the support 10, and the horizontal hole 15 is used as a countersink hole 14.
It is preferable to open at the bottom of the disk, that is, below the disk 8. This horizontal hole 15 is connected to a source of neutral gas (not shown) to adjust the composition of the atmosphere surrounding the jet of molten metal exiting the hole 9 of the disk 8 and, if necessary, this atmosphere. To an oxidizing atmosphere, a neutral atmosphere or a reducing atmosphere. The vessel is positioned such that the bottom surface of the support 10 is at a distance of at most 1 cm from the layer of cooling liquid, so that the entire path of the jet of liquid metal into the cooling liquid is deactivated. You can

In order to press the disk 8 firmly against the flat support 7 of the container 1, a vertical upward return force must be applied to the support 10. Therefore, in the example shown in FIG. 1 (a), the holes 1 are formed in the side arms 11 and 12 of the supporting body 10, respectively.
6, 17 are formed in each hole 16, 17 with a threaded rod 18, 1
9 is inserted. Removable washers 20 and 21 called bottom washers, which are capable of contacting the bottom surfaces of the side arms 11 and 12 of the support 10, are attached near the lower ends of the threaded rods 18 and 19, respectively.

Springs 24 and 25 are wound around the threaded rods 18 and 19 penetrating holes 22 and 23 formed in the lid 3 of the container 1. Each spring 24, 25 abuts on the upper surface of the lid 3 and washers 26, 27 called top washers located near the upper ends of the threaded rods 18, 19. Therefore, the springs 24, 25
Exerts an upward force on the threaded rods 18, 19 via the top washers 26, 27, which force is applied to the support via the bottom washers 20, 21.
An upward return force is applied which is transmitted to the side arms 11, 12 of the disk 10 and presses the disk 8 against the flat support 7 of the container 1. This returning force needs to be equal to or greater than the force applied by the molten metal to the disk 8 due to the weight of the molten metal and the pressure applied by the container 1.

When the disk 8 is blocked or worn, the disk 8 can be replaced very easily by removing the washers 20 and 21 and the support 10 together with the disk 8. The support 10 fitted with the new disc 8 can likewise be easily replaced. Therefore, when the other parts of the container 1 are not significantly worn, the optimum casting conditions can be quickly recovered without replacing the entire container 1.

FIG. 2 is a conceptual longitudinal section of another embodiment of the present invention. In this embodiment, the bottom end of the container 1 for containing the molten metal is a substantially frustoconical member 28 having a hole 29. The inner bottom portion of the truncated cone 28 forms a conical support portion 30. Abutted against this support 30 is a component 31 machined from the refractory material of boron nitride or a composite material based on boron nitride during the manufacture of the container 1. This part 31 is funnel-shaped, its frusto-conical upper part 32 is supported by a conical support 30 of the container 1, its cylindrical lower part 33 passing through the hole 29 of the container 1 outside the hole 29. To several mm
Extending. This cylindrical lower portion 33 becomes the first element of the molten metal exit die. The outer wall of the cylindrical lower part 33 of the funnel-shaped part 31 is threaded to receive the nut 34.

The nut 34 is made of the same material as the funnel-shaped part 31 or metal (stainless steel, titanium alloy, nickel alloy, etc.). In the case of metal, it must be a metallic material that exhibits a coefficient of expansion similar to that of the funnel 31. A hole 35 is formed in the bottom surface of the nut 34. This hole 35 is an extension of the internal flow path 36 of the funnel-shaped part 31 when the nut 34 is attached, but the inner diameters do not necessarily have to be the same. A housing portion 37 is formed inside the nut 34. This accommodation 37
A disk 8 (having a hole 9) having the same shape, structure and function as the above-mentioned embodiment is arranged therein before the nut 34 is fastened to the funnel-shaped part 31. That is, when the nut 34 is tightened on the funnel-shaped part 31, the disk 8 is pressed against the bottom end of the funnel-shaped part 31 and acts as the tip of the die when casting a very fine wire of molten metal. Form a screw on the outside of the nut 34 to hold the whole more rigidly,
Second contacting the lower end of the truncated cone-shaped portion 28 of the container 1
You can also receive the nut 38 of.

At the bottom of the nut 34 there is a hole under the disk 8.
Holes 39 leading to 35 can be formed. If this hole 39 is connected to a gas supply source, the jet of the molten metal exiting the disk 8 can be deactivated, as in the above embodiment. Also in this embodiment, the nuts 34 and 38 are removed to remove the disk 8
The disk 8 can be replaced very quickly by replacing the disk 8 and refastening the nuts 34, 38 on the funnel-shaped part 31.

In a modification, a funnel-shaped part 31 is provided on the bottom of the container 1.
Instead of inserting, the lower end of the container 1 itself can simply be a cylindrical projection and the outer surface thereof can be threaded. The present invention is not limited to the above embodiment, but is simply replaced at the bottom end of the molten metal container, which serves to determine the diameter of the molten metal jet for forming the very thin wire to be cast. Any other variation in which possible perforated discs are applicable is conceivable. The container of the present invention can be used in any device for direct casting of very fine wires, independent of the method of solidification of a jet of molten metal.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the present invention.

[Explanation of symbols]

1 Container 2 Hemispherical Part 3 Lid 4 Passage 5 Induction Coil 6 Hole 7 Support 8 Disc 9, 14, 29, 35, Hole 10 Support 11, 12 Side Arm 13 Center 15, 39 Hole 16, 17, 2
2, 23 holes 18, 19 threaded rod 20, 21 bottom washer 24, 25 spring 26, 27 top washer 28 frustoconical section 30 frusto-conical support section 31 funnel-shaped part 34 nut 36 internal flow path 37 receiving section 38 number Two nuts

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Christian Gatellier France 57158 Montigny-le-Metzlude Pre 6 (72) Inventor Guzabie Lecoq France 54000 Nancy Batiman 3 Boulevard du 26 Elui 30 (72) Invention Erbe Tavernier France 57070 Méz Valier Le Du Tour Du Reevre 20

Claims (6)

[Claims] 1. A very thin wire is directly continuously cast from a molten metal containing a molten metal, having a sealing lid (3) and having a die at the bottom end whose final inner diameter determines the diameter of the wire. In the container (1) used in the device for at least one part of the die is composed of a disk (8) independent of the container (1), the disk (8) having a through hole (9), A container characterized by having means for detachably pressing the disk (8) to the bottom end of the container (1). 2. A passage (1) connected to a gas source by means for detachably pressing the disk (8) against the bottom end of the container (1).
5, 39) are formed, and this passage (15, 39) is a disc.
The container according to claim 1, which is open below (8). 3. A support (10), which serves as a storage portion for the disk (8), by means of which the disk (8) is detachably pressed against the bottom end of the container (1), and the support (10) is directed vertically upward. The container according to claim 1 or 2, which further comprises means for applying a restoring force, and has a hole (14) formed in the support (10). 4. A screw rod (1) penetrating the support (10) and the lid (3) is provided with a means for applying a vertically upward returning force to the support (10).
8, 19), a removable bottom washer (20, 21) located near the lower end of this screw rod (18, 19), and a top washer (26, 19) located near the upper end of the screw rod (18, 19). Container according to claim 3, comprising a spring (24, 25) exerting a force on the upper surface of the lid (3) and the bottom surface of the bottom washer (26, 27). 5. The bottom end of the container (1) is constituted by a cylindrical projection (33), the outer surface of which is threaded, so that the disc (8) is placed in the container (1). The means for detachably pressing the bottom end of (1)) is constituted by a nut (34) having a receiving portion (37) for the disk (8), and the nut (34) is screwed with the above-mentioned screw. Or the container according to 2. 6. A funnel-shaped part having a frustoconical surface on the inside of the bottom of the container (1) and a cylindrical projection (33) inserted in the container (1).
The container according to claim 5, which constitutes the bottom of the (31).