JPS5930456A - Disc used for producing foil piece directly from molten material - Google Patents

Abstract

PURPOSE:To make the width and thickness of foil pieces constant and to improve remarkably the yield thereof by specifying the shape on the outside circumferential surface of a disc onto which a molten material is injected and brought to cohesion. CONSTITUTION:A disc 1 of a high heat capacity made of a metal having high heat conductivity is rotated at a high speed around the central revolving axis line and molten metal is solidified and brought to cohesion on the outside circumferential surface 10 thereof, then the molten metal is released and scattered from the outside surface by centrifugal force, whereby foil pieces are obtd. Sepn. grooves 14 that extend across the surface 10 are provided apart from each other circumferentially at the space D corresponding to the length L of the foil piece to be produced thereby forming arc-shaped projections 16 having many divided arc surfaces 15. The grooves 14 have the effect of cutting the foil formed by cohesion on the surfaces 10 to the foil pieces of a required length, and foil pieces 17 having a specified width and thickness are formed on the surfaces 15. The generation of powder and other dust is extremely less in this stage and the yield is remarkably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing foil pieces of metal or similar material directly from molten material, and in particular to a disk for use in such an apparatus.

Conventionally, as a manufacturing device for such foil pieces, for example,
There are devices such as those described in Japanese Patent Application Laid-Open No. 7-20066, Japanese Patent Application Laid-open No. 54-60262, and Japanese Patent Application Laid-open No. 157768/1989, and these conventional devices all use disk-shaped or cylindrical casting tools. (referred to as a disk in this specification) has a large number of serrated protrusions provided at a predetermined pitch on its outer peripheral surface.

However, when a disk having such serrated projections on the outer circumferential surface is used for manufacturing foil pieces, a large amount of debris is generated.
There is a problem that the yield of foil pieces is poor.

The present invention was developed in view of the MK, and as a result of various studies and experiments to improve the yield of foil pieces, it was found that with the conventional serrated protrusion shape, air is trapped in the tooth bottom part when the disk rotates. It was confirmed that the molten material injected onto the back surface of the tooth would have a disordered shape and uneven thickness on the bottom side of the tooth, and the shape of the serrated protrusion was improved to prevent such air entrainment. However, the improvement in yield was not as high as expected, and as a result of further investigation, we found that the essential drawback of the sawtooth shape is that the point of contact between the injection flow and the disk is vertical from the tooth tip to the tooth bottom. As it moves, the width of the foil piece is wide at the tip of the tooth, and becomes narrower towards the bottom of the tooth.As a result, not only the width of the foil piece is not constant, but also the thickness is not uniform, and the shape is not square. It was confirmed that the yield could not be improved beyond a certain level because the shape was trapezoidal and irregular.

Therefore, an object of the present invention is to provide the outer circumferential surface of the disk itself, instead of the conventional configuration in which serrations are provided at a predetermined pitch in the circumferential direction of the disk and the back surfaces of the teeth are used as surfaces for adhesion of molten material. It is an object of the present invention to solve the above-described problems in the prior art by utilizing the circular arc surfaces obtained by dividing the circumferential direction by separation grooves as molten material adhesion surfaces.

For this reason, according to the present invention, separation grooves that cross the outer circumferential surface of the disk are provided at intervals corresponding to the required length of the foil pieces, spaced apart in the circumferential direction on the outer circumferential surface of the disk, thereby dividing the outer circumferential surface of the disk by the separation grooves. The present invention will be described below with reference to the drawings.

The drawing shows a foil piece manufacturing apparatus using a disk according to the present invention. In FIG. 1, 1 is a disk, 2 is its rotating shaft, and 8 is a closed container for holding a molten material 4, such as molten aluminum, in a molten state. , a heating chamber 5 is strung around the outer periphery,
For example, it is configured to be heated and maintained at a predetermined temperature by combustion gas from a burner 6, and a pressure gas supply pipe 7 is connected to the upper end to supply pressurized inert gas such as argon, and the lower end is connected to the pressure gas supply pipe 7 for supplying pressurized inert gas such as argon. Plate 8 is fired several times, and this injection plate 8
For example, the molten alumina 11 is injected onto the outer peripheral surface 10 of the disk 1 from an orifice 9 having a diameter of +1.5y+tm, as shown by injection flow 1.1, on the outer peripheral surface 10 of the disk 1. 12 is a thermocouple, and 13 is an on-off valve.

The disk 1 is made of a metal with excellent thermal conductivity, such as copper or brass, and has a cylindrical shape with a diameter of 30 (l mm), and is rotated at a high speed of, for example, 200 (l rpm). As such, cooling water is passed into the inside of the disk 1 through the center hole 2/ of the hollow rotating shaft 2 and cooled.

The outer peripheral surface 10 of the disk 1 is provided with separation grooves 14 extending across the outer peripheral surface and spaced apart in the circumferential direction at intervals corresponding to the length L of the foil piece to be manufactured. arcuate protrusions 16 having a large number of arcuate surfaces 15 are formed.

The separation groove 14 has the function of cutting the foil adhered and formed on the disk outer circumferential surface 11 into foil pieces of a required length. Therefore, the width a and depth b of the separation groove 14 correspond to the circumferential speed of the disk 1. Although it is related to the injection flow rate and the injection flow rate, generally the separation groove 1
Width a of 4 is 0.1 to 0.5 mm, depth b is Q, 02 to 0
．． Satisfactory results have been obtained by setting the diameter to about 2771.771, and as a practical numerical example, the diameter a
Rotating an o o mm disk at 270 Orpm,
Molten aluminum is injected with a diameter of 0.6 at an injection pressure of 1.4 atm.
When injecting through an injection orifice of mm, the width a is 0.
The foil pieces 17 can be reliably separated by using the separation grooves 14 with a depth b of 3 mm and a depth b of 0.1 mm.

Note that the foil piece 17 is formed by adhering onto the arcuate surface 15 defined by the separation groove 14 on the outer circumferential surface 10 of the disk 1.
The width of the foil piece 17 is determined by the cross-sectional area of the injection flow 11 injected from the injection orifice 9, the flow velocity, and the peripheral speed of the disk, and the thickness of the foil piece 17 is determined by the temperature of the molten metal, the outflow velocity, and the disk It is determined by the thermal conductivity of the material, the circumferential speed of the disk, the viscosity (surface tension) of the molten metal, etc.

In the illustrated example, the separation groove 14 extends parallel to the disk rotation axis 2 and is provided on the outer circumferential surface of the disk. It is also possible to provide the required directionality in the scattering direction of the foil pieces ejected from the disk.

Next, Table 1 shows the results of a comparative experiment in which foil pieces were manufactured using a disk according to the present invention and a conventional disk having sawtooth projections.

The manufacturing conditions are the same except for the disc.
The same equipment was used. In addition, in all cases, the disc material is copper-0 piece-Zr alloy (G, 8. Cr-(,1,
5Z, r-Co residual), diameter: 300 mm, width 8
A 0 mm diameter disc was used.

Table 1 According to the present invention, the contact point between the injection flow and the disk moves up and down by causing the injection flow of molten material to adhere to the arcuate surface defined by dividing the outer circumferential surface of the disk by dividing grooves. Since the foil pieces formed on the arcuate surface have a constant width and a constant thickness, there is extremely little generation of powder and other debris, and the yield can be significantly improved compared to conventional methods. is obtained.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a foil piece manufacturing device using a disc according to the present invention, Fig. 2 is a side view of a disc according to the present invention, and Fig. 8 is a circular arc shape on the outer peripheral surface of a disc according to the present invention. FIG. 4 is an enlarged side view of a conventional serrated projection, FIG. 5 is a perspective view showing a state in which a foil piece is formed on the arcuate projection of a disc according to the present invention, and FIG. 6 is an enlarged side view of a protrusion. FIG. 7 is a perspective view showing a state in which a foil piece is formed on the sawnami protrusion of a conventional disk; FIG. The figure is a plan view of a foil piece manufactured using a conventional serrated disk. l... Disc, 10... Outer circumferential surface, 1.41...
Separation groove, 15...Circular surface, 16...Circular projection. Fig. 16 Fig. 2 Fig. 31y] Fig. 4 Fig. 51 missing 1

Claims (1)

[Claims] L: Made of a material with large heat capacity and excellent thermal conductivity, the disk is rotated at high speed around the central axis of rotation, causing molten metal to adhere to the outer circumferential surface of the disk and being ejected and scattered from the outer circumferential surface by centrifugal force. In a disk used for producing foil pieces directly from molten material by
Separation grooves that cross the outer circumferential surface of the disk are spaced apart in the circumferential direction on the outer circumferential surface of the disk at intervals corresponding to the required length of the foil pieces, thereby creating a large number of arcuate projections divided by the separation grooves on the outer circumferential surface of the disk. A disk used for directly manufacturing foil pieces from molten material, characterized in that it has: