JPS588940B2 - Apparatus and method for continuous metal filament casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to reducing thermal distortion of quench casting surfaces undergoing continuous casting.

More specifically, the present invention relates to a rapid cooling casting wheel (quench casting wheel) for continuous casting of glassy alloy filaments.
ch wheel) hoop-shaped quenched casting surface (que
nch surface) to permit radially constrained Renai thermal expansion.

Extruding molten alloy from a pressurized crucible through a nozzle into a rotating quench caster is one of several technologically important methods available for continuous casting of continuous glassy alloy filaments. It is one.

A representative document regarding this is US Patent 4]
4 2 5 7 1, ``Continuous casting method of metal strip'' (March 1979, 68M, Nara im ha
seen in n.

Typically, filaments of this type are cast continuously as thin strips.

This is the process of quenching the molten alloy.
This is because it is necessary to provide an extremely high quenching rate to obtain a glassy state.

In order to maintain transverse consistency along the length of the cast strip, it is essential that a geometrically stable quench casting surface be provided.

Continuing with this, the so-called "crowning"
)” has arisen.

This results in thermal distortions in the hoop-shaped quench casting surface of the quench casting wheel causing the quench casting surface to deflect radially outward.

This is because the hot quench casting surface is constrained along its periphery by the disk on the cold side of the quench casting wheel.

(``Discontinuity stress'').

Therefore, in steady-state continuous casting using a quench casting wheel in thermal equilibrium, the shape of the cross-section of the cast filament is affected by the warpage of the quench casting surface (bo
wing) is inconveniently introduced.

The present invention allows for unrestrained radial thermal expansion of the hoop-shaped quench casting surface in such a way that the concentricity of the quench casting surface with respect to the axis of rotation is maintained, and that the hot expanded hoop-shaped quench casting surface is located beneath the hoop-shaped quench casting surface. Substantially eliminates the problem of crowning of quenched casting surfaces in continuous casting using quenched casting wheels by providing circumferential fixation against rotational torque loads such that the rotational drive disc does not slip in the north of the quenched casting wheel. This will solve the problem.

The method of the present invention for continuous casting of metal filaments, especially vitreous alloy strips, includes the following steps.

(a) directing a flow of molten alloy onto the hoop-shaped quench casting surface of a rotating quench casting wheel; and (b) in a fixed angular relationship with respect to the rotating quench casting wheel; To allow unrestrained radial thermal expansion for quench casting while maintaining concentricity.

The apparatus of the present invention for continuous casting of metal filaments by directing a flow of molten metal into a rotating quench caster includes the following components.

(a) a quench casting wheel having a rotatable drive disk around an axis of rotation and concentrically supporting a hoop-shaped quench casting surface; and (b) in a fixed angular relationship with respect to the drive disk. An expansion device for permitting unrestrained radial thermal expansion of a quenched casting surface while maintaining concentricity in the quench casting surface.

The expansion device preferably includes at least three radial expansion joints or joints connecting the quench casting surface and the drive disc, these joints being arranged symmetrically with respect to the axis of rotation.

More preferably, six expansion joints as described above are used.

To explain in detail with reference to the drawings, in Figure 1,
A typical conventional apparatus for continuous casting of vitreous alloy filaments is illustrated to illustrate the general application of the invention.

The molten alloy is contained in a crucible 11 having a heating element 12 .

When the crucible 11 is pressurized with an inert gas, the crucible 11
A stream of molten metal is forced through a nozzle 13 at the bottom of the quench casting wheel 17 and impinges on the quench caster 14 of a rotating quench casting wheel 17.

After the solidified kinetic filament 16 leaves the exit point from the quench casting surface 14, it typically passes through a tensioning device and is ultimately sent to a winder (not shown).

The quench casting wheel is provided with conventional cooling means (not shown) to maintain the quench casting surface at a substantially constant temperature during continuous casting.

This is done by bringing a cooling liquid or gas into contact with the rapidly cooled casting surface.

For example, cooling water may be circulated inside the quench casting wheel, or the quench cooling surface may be spray cooled from the outside.

Quench casting surfaces are typically alloys with desirable characteristics such as generally high thermal conductivity, low thermal expansion, high abrasion resistance, and low chemical reactivity with the extruded melt and therefore high wetting properties. It is made of an alloy containing a large proportion of copper, such as beryllium copper.

Additionally, high conductivity quench casting surfaces can be coated with a thin layer of high melting point ceramic or refractory alloy to improve wear resistance.

Other components of the quench cast wheel may be any conventional structural alloy, such as a high strength aluminum alloy.

Figure 2 shows the middle height (crowning) of quench casting direction 14.
) or thermal-bowi
In order to explain the problem of
Ten partial cross sections are shown.

Typically, the hoop-shaped quench casting surface 14 is connected to a drive disk 15 rotating the quench casting wheel 170 by means of conventional fastening joints, such as bolts 21.

The quench casting surface 14 is preferably flat at room temperature, but during operation, molten metal is forced through the nozzle 13 onto the quench casting surface 14 to form filaments 16.
Since it is continuously cast, a substantial temperature gradient develops between the hot quench casting surface 4 and the cold drive disk 15.

Therefore, due to thermal expansion, the quenched casting surface 14 becomes crow
n) or a bow.

This is because the side edges of the casting surface are restrained by the lower temperature drive disk 15 and bolts 21.

As a result, the cross-sectional uniformity of the cast filament 16 is adversely affected.

In FIG. 3, one embodiment of the present invention is applied to a conventional quench casting wheel 17, in which three radial expansion joints 31 replace the conventional fixed joints 210 on the quench casting surface. 14 and the drive disk 15.

Disk 15A may be a separate drive disk or may simply be a coolant sealing disk.

Conceptually, the radial expansion joint 31 allows unrestrained radial thermal expansion of the quench casting surface 140 while maintaining concentricity of the quench casting surface 14 with respect to the axis of rotation 14;
Also during this time, a circumferential fixation is provided against the rotational torque loads, so that the hot expanded quench casting surface does not slip on the underlying drive disc.

Figure 3A shows details of one such radial expansion joint.

This part essentially consists of a radius provided in the drive disk 15 that has a main axis aligned along the radius of the drive disk 150 and includes sliding pins 33 that are laterally constrained without gaps. It consists of a slot 32 for expansion and contraction extending in the direction.

A slide pin 33 rests on the underside of the quench casting surface 14 and is able to slide within the slot 32 when the quench casting surface 14 undergoes radial thermal expansion.

On the other hand, the sliding pin 33 is located in the slot 32 and cannot freely move in the circumferential direction.

Therefore, the torque load from the drive disk 15 is transmitted to the quench casting surface 14.

In order to maintain the concentricity of the hoop-shaped quench casting surface 14 with respect to the axis of rotation 18 when radial thermal expansion occurs, at least three radial expansion joints 31 as described above are provided.
is required.

Furthermore, the radial expansion joint 31 must be symmetrically positioned on the drive disk 15 in order to maintain the concentricity of the quench casting surface 14.

For example, the three joints 31 are arranged at equal radial distances from the rotating shaft 18 and at equal angles (
(at 120° intervals).

In practical terms, due to machining tolerances, each radial expansion joint has some circumferential slack;
Therefore, with respect to the drive disk 15, the quench casting surface 14 has some circumferential (rotational) slack corresponding to the above.

This rotational slack can be reduced by increasing the number of radial expansion joints beyond the minimum number of three.

The minimum number of three is basically necessary to maintain concentricity of the quench casting surface.

Statistical studies of error tolerance have shown that it is preferable to use six radial expansion joints arranged symmetrically as described above.

FIG. 4 shows a partial cross-section of a quench casting wheel revealing the side end details of one embodiment of the radial expansion joint 31. In FIG.

The slide pin 33 passes through a telescoping slot 32 provided in the drive disk 15 and is fixed to the lower side 41 of the quench casting surface 140 .

In FIG. 4A, another arrangement of slide pin type radial expansion joints is shown.

In this case, the telescoping slot 32 is integrated with the quench casting surface 14 and the sliding pin 33 is fixed to the drive disk 15.

Other embodiments of radial expansion joints are conceivable besides the sliding pin type.

For example, FIG. 5 shows a sliding key type radial expansion joint.

The sliding key 51 is fixed to the drive disk 15 and is arranged inside the telescoping groove 52 below the quench casting surface 14.

As discussed above, at least three such symmetrically arranged expansion joints are required to maintain the concentricity of the quench casting surface 14.

As in the case of a sliding pin joint, the relationship between the key and the groove can be reversed.

The driving disk 15 is optionally shown supporting the quenched cast member 14 near its lower central portion.

The virtual disk 15A is a disk for sealing the coolant inside.

Although the present invention has been described with reference to preferred embodiments thereof, it will be apparent to those skilled in the art that various improvements and changes can be made without departing from the principle and scope of the invention.

Therefore, it should be understood that such improvements and changes also fall within the technical scope of the present invention as defined in the claims.

[Brief explanation of drawings]

FIG. 1 shows a typical method for continuous casting of continuous filaments of glassy alloys consisting of extruding a stream of molten metal from a crucible under pressure through an extrusion nozzle toward the quench casting surface of a rotating quench casting wheel. 1 is an illustration of a prior art device; FIG. FIG. 2 is a partial cross section near the axis of a quench casting wheel for explaining the problem of height or thermal warpage of the cooling casting surface when it is hot relative to its position when it is cold. FIGS. 3 to 3A are explanatory diagrams showing one embodiment of the present invention in which a quench casting surface is fixed to a quench casting wheel by three slide pin radial expansion joints. Figures 4 to 4A show two embodiments of slide pin type expansion joints. FIG. 5 shows an example of a sliding key type radial expansion joint. The symbols in the figure represent the following: 11... Crucible, 12... Heating element, 13... Tuzzle, 14... Quenched casting surface, 15... Drive disk, 16 ...Filament, 17...Wheel for rapid cooling casting, 18.
... Rotating shaft, 14A ... "Medium height" or "curvature" on the quenched casting surface, 21 ... Bolt, 31
...Radial expansion joint, 32...Slot, 33...Sliding pin, 51...
Sliding key, 52...groove.

Claims (1)

[Scope of Claims] 1. Apparatus for continuous casting of metal filaments by applying a flow of meltable alloy to a rotating quench casting surface, comprising the following components: (a) around the axis of rotation; (b) a quench casting wheel having a rotatable drive disk consisting of a rotating disk mounted on the quench casting surface and supporting a concentrically disposed hoop-shaped quench casting surface; and (b) a radial direction of said quench casting surface; Consisting of an expansion and contraction device that allows thermal elongation without restraint, but in this case, in order to maintain the concentricity of the casting surface, the angular relationship with the drive disk is maintained constant. A continuous metal filament casting device featuring: 2. The expansion and contraction device further comprises at least three expansion joints that allow expansion and contraction in the radial direction and are provided between the quench casting and the drive disk, and these joints are symmetrical about the axis of rotation. Device according to claim 1, characterized in that it is arranged in a. 3. Device according to claim 2, characterized in that each said radially telescoping expansion joint is a sliding pin expansion joint. 4. Device according to claim 2, characterized in that each said radially telescoping expansion joint is a sliding key expansion joint. 5. Device according to claim 3 or 4, comprising at least 6 said expansion joints. 6. A method for continuously casting metal filaments, comprising: (a) directing a stream of molten metal against a hoop-shaped quench casting surface of a rotating quench casting wheel; and (b) quenching during said rotation. The process for continuous metal filament casting comprises allowing unrestrained radial thermal elongation of the quench casting surface while maintaining concentricity in a fixed angular relationship to a casting wheel. 7. A method according to claim 6, characterized in that the filament is a vitreous alloy strip.