JPS6151601B2 - - Google Patents

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. Conventional apparatuses for producing such foil pieces include, for example,
There are devices such as those described in Japanese Patent Publication No. 57-20066, Japanese Patent Application Laid-Open No. 54-60262, and Japanese Patent Application Laid-open No. 54-157763, and these conventional devices all perform disk-shaped or cylindrical casting. The tool (herein referred to as a disk) has a number of serrations at a predetermined pitch on its outer circumferential surface. However, when a disk having such serrated projections on its outer peripheral surface is used for manufacturing foil pieces, there is a problem that a large amount of waste is generated and the yield of foil pieces is poor. The present invention was developed in view of these problems, and as a result of various studies and experiments to improve the yield of foil pieces, we found that with the conventional serrated projection shape, air is wound around the bottom of the tooth when the disk rotates. It was confirmed that the molten material injected onto the back surface of the tooth would have irregular shapes and uneven thickness on the bottom side of the tooth due to entrapment, and the shape of the serrations 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, resulting in a square shape. It was confirmed that the yield could not be improved beyond a certain level because the shape was not uniform but trapezoidal. 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 surface of the teeth is used as a surface for adhering molten material. It is an object of the present invention to solve the above-mentioned problems with the prior art by utilizing arcuate surfaces obtained by dividing the circumferential direction by separation grooves as molten material adhesion surfaces. Therefore, as a result of various experiments and studies, we found that in order to produce high-quality square or rectangular foil pieces with uniform shapes at a high yield, the protrusions 16 on the outer periphery of the disk should be shaped like an arc, as shown in FIG. The inclination angle θ of the groove surface on the rear side in the disk rotation direction A of the separation groove 14 between the protrusions 16 is small; and the front end 15a of the arcuate surface 15 of the protrusion 16 in the disk rotation direction A. The present invention was based on the discovery of the fact that the following three requirements must be satisfied: the curved surface with a large radius of curvature R must be continuous with the separation groove 14, and the present invention was made based on the recognition of this fact. 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. A large number of protrusions having a radius of curvature are provided on the outer periphery of the disk, the rear groove surface of these separation grooves has a small inclination angle in the disk rotation direction, and the front end of the arcuate surface of the protrusion in the disk rotation direction has a curved surface with a large radius of curvature. It is characterized by being connected to the separation groove. The invention will now be explained with reference to the drawings. The drawing shows a foil piece manufacturing apparatus using a disk according to the present invention, and in the drawing, 1 is a disk, 2 is its rotating shaft, and 3 is a closed container for holding a molten material 4, such as molten aluminum, in a molten state. ,
A heating chamber 5 is provided on the outer periphery, and is configured to be heated to and maintained at a predetermined temperature by, for example, combustion gas from a burner 6, and an inert gas such as argon is supplied to the upper end under pressure. A gas supply pipe 7 is connected, and an injection plate 8 is attached to the lower end of the injection plate 8. Molten aluminum is applied onto the outer circumferential surface 10 of the disk 1 by gas pressure from an orifice 9 with a diameter of 0.5 mm, for example, bored in the injection plate 8. It is configured to inject as shown by injection flow 11. 12 is a thermocouple;
13 indicates 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 300 mm, and is rotated at a high speed of 2000 rpm, and as is known, is a hollow rotating disk. Cooling water is passed into the inside of the disk 1 through the center hole 2' of the shaft 2 to cool it. The outer circumferential surface 10 of the disk 1 is provided with separation grooves 14 extending across the outer circumferential surface and spaced apart in the circumferential direction by an interval D corresponding to the length L of the foil piece to be manufactured. An arcuate protrusion 16 divided by a separation groove 14 and having a large number of arcuate surfaces 15
is formed. The separation groove 14 has the function of cutting the foil adhesively 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 peripheral speed of the disk 1 Generally speaking, the width a of the separation groove 14 is 0.1 to 0.5, although it is related to the injection flow speed.
Satisfactory results have been obtained by setting the depth b to about 0.02 to 0.2 mm.As a practical numerical example, a disk with a diameter of 300 mm is rotated at 2700 rpm, and molten aluminum is heated to a pressure of 1.4 atm. When injecting through an injection orifice with a diameter of 0.6 mm at injection pressure, a separation groove 14 with a width a of 0.3 mm and a depth b of 0.1 mm is used.
Using this method, it is possible to reliably obtain separated foil pieces 17. Note that a separation groove 14 is formed on the outer peripheral surface 10 of the disk 1.
The width of the foil piece 17 that is adhered and formed on the arcuate surface 15 defined by The thickness of the foil piece 17 is determined by the temperature of the molten metal, the outflow velocity, the thermal conductivity of the disc material, the circumferential speed of the disc, the viscosity (surface tension) of the molten metal, and the like. In the illustrated example, the separation groove 14 is connected to the disk rotation shaft 2.
Although the foil is provided on the outer circumferential surface of the disk extending parallel to the disk, it can also be provided obliquely across the outer circumferential surface of the disk by tilting it at an appropriate angle with respect to the disk rotation axis 2. A desired directionality can be given to the scattering direction of the pieces. 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 serrated projections. The manufacturing conditions were the same except for the disk, and the same equipment was used. In addition, in both cases, the disk material is a copper-Cr-Zr alloy (0.8Cr-Zr alloy).
A disk with a diameter of 300 mm and a width of 80 mm was used.

【table】

[Table] According to the present invention, 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, the contact point between the injection flow and the disk is formed. Since the foil pieces do not move up and down, the width and thickness of the foil pieces formed on the arcuate surface are constant, the generation of powder and other debris is extremely low, and the yield is significantly improved compared to conventional methods. You can get the effect of getting it.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a foil piece manufacturing apparatus using a disk according to the present invention, FIG. 2 is a side view of the disk according to the present invention, and FIG. 3 is an enlarged side view of an arcuate protrusion on the outer peripheral surface of the disk according to the present invention. 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 a diagram of a conventional disc. A perspective view showing a state in which a foil piece is formed on a serrated projection, FIG. 7 is a plan view of a foil piece manufactured using the disk according to the present invention having the illustrated arcuate projections, and FIG. FIG. 3 is a plan view of a foil piece manufactured using a disc with serrations; DESCRIPTION OF SYMBOLS 1... Disc, 10... Outer peripheral surface, 14... Separation groove, 15... Arc surface, 16... Arc-shaped projection.

Claims (1)

[Claims] 1 Made of a material with large heat capacity and excellent thermal conductivity, it is rotated at high speed around the central rotational axis of the disk, and the molten metal is adhered to the outer circumferential surface of the disk and is then drawn from the outer circumferential surface of the disk by centrifugal force. In a disk used for producing foil pieces directly from molten material by discharging and scattering, separation grooves with an approximately V-shaped cross section that cross the outer circumferential surface of the disk are arranged circumferentially on the outer circumferential surface of the disk at intervals corresponding to the required length of the foil piece. A large number of protrusions having arcuate surfaces located on the same circumference are provided on the outer periphery of the disk, and the inclination angle of the groove surface on the rear side of the separating groove in the disk rotation direction is A disk used for directly manufacturing a foil piece from a molten material, characterized in that the front end of the arcuate surface of the protrusion in the direction of rotation of the disk is a curved surface with a large radius of curvature and is connected to the separation groove.