JPS6155561B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method for directly manufacturing from molten metal foil-shaped metal chips having a relatively small substantially rectangular shape with a side length of 5.0 mm or less, and an apparatus for manufacturing the same. [Prior art and its problems] As a conventional method for directly manufacturing foil metal chips from molten metal, for example, the method described in Japanese Patent Publication No. 1982-20066 previously provided by the present applicant is known. be. The manufacturing method involves using a casting tool in which serrations having a tooth width approximately equal to the width of the foil piece to be manufactured are provided on the outer periphery at a pitch of five times or more the length of the foil piece. Rotate the molten material pool from the back side in a direction of rotation in contact with the liquid surface of the molten material pool, and bring the tooth back surface of the sawtooth protrusion into at least contact with the molten material pool whose temperature and liquid level are kept constant, and the molten material in contact with the molten material pool. The method is characterized in that foil pieces are manufactured by rapidly solidifying the foil pieces on the tooth back surface and separating and scattering the foil pieces from the tooth back surface using the centrifugal force generated by the rotation of the casting tool. Depending on the method, it can be manufactured to desired dimensions and thickness. However, in the conventional method for manufacturing foil metal chips, as shown in FIG. 9, the serrated protrusions of the casting tool are immersed in the molten material, and the molten material in contact with the protruding surface is rapidly solidified. After being at least partially solidified, the foil-shaped metal chips were peeled off from the protrusion surfaces by centrifugal force, so some of the foil-shaped metal chips manufactured by this method had a widthwise width as shown in FIG. There were many cases in which products were manufactured that had rib-like protrusions on both sides. Metal chips having such rib-like protrusions adhere firmly to the sawtooth-like protrusions due to the rib-like protrusions, making it difficult to separate the chips from the protrusions, and reducing the productivity of the metal chips. Moreover, the serrated protrusions penetrate into the molten material by hitting the liquid surface, which causes the liquid surface to vibrate up and down.
As a result, the amount of molten material deposited on the protrusions varies locally, making it impossible to obtain foil-like metal chips with uniform wall thickness. Further, as another conventional method for producing foil-like metal chips (flake particles), there is also a method described in Japanese Patent Application Laid-Open No. 157763/1983. The method of production consists of: (a) rotating a thermal extraction drum having a serrated edge with each serration substantially parallel to the axis of rotation; and (b) melting to form individual flake particles on each serration. (c) releasing the particles from said serrations; (d) said It is characterized by the following steps: cooling the particles in the surrounding air; I'm trying to produce it. However, in this method of producing foil metal chips, it is necessary to inject molten metal from a nozzle with an extremely small diameter. Rapid cooling by the atmosphere not only increases the viscosity of the molten metal, making it difficult to form metal chips with uniform thickness, but also reduces the nozzle diameter due to precipitates from the molten metal, and decreases the temperature. The problem is that the molten metal solidifies and the nozzle gets clogged (this is especially noticeable with metals with high melting points, such as stainless steel), making it difficult to continuously and efficiently manufacture small foil metal chips. The dot was hot. [Means for Solving the Problems] This invention has been made by focusing on such conventional problems, and this application is based on the embodiments shown in FIGS. 1 to 7. rotating drum 1
A large number of small faces 10a provided so as to extend in the tangential direction on the outer peripheral surface of the melting tank 6 are successively brought into contact with the molten metal 2 housed in the melting tank 6, and the molten metal 2 is applied to these small faces 10a in the form of a foil. The foil-like molten metal chips are attached to the foil-like molten metal 2 and solidified at least in part by removing heat from the foil-like molten metal 2, and then the foil-like metal chips are peeled off from the face 10a. The manufacturing method is provided as a specified invention, and the molten metal 2 accommodated in the melting tank 6,
It has a large number of small faces 10a extending tangentially to the outer peripheral surface, and the molten metal 2 is adhered to the surface of these small faces 10a in the form of a foil, and heat is removed from the molten metal 2 to solidify at least a portion thereof. Rotating drum 1
Then, the foil metal chip 20 that has adhered to the small surface 10a and at least partially solidified is placed on the small surface 10a.
By providing, as a combined invention, an apparatus for manufacturing a foil-shaped metal chip characterized by having a peeling means 4 for peeling the chip from a, it is possible to produce a foil-shaped metal chip in a relatively small substantially rectangular shape by a simple method. The object of the present invention is to enable continuous production in large quantities using an apparatus with a simple structure. [Function] Accordingly, the present invention provides a rotating drum with a large number of facets extending tangentially on the outer circumferential surface of the rotating drum, and molten metal contained in a melting tank is formed on the surface of each facet of the rotating drum. are successively brought into contact with each other to adhere them in a foil-like manner, and at the same time, heat is removed from the foil-like molten metal to solidify at least a portion of the molten metal, and then the foil-like metal chip, at least a portion of which has been solidified, is peeled off from the facet. As a result, substantially rectangular foil-like metal chips can be manufactured in large quantities by a simple method and with a device of simple construction. [Examples] The present invention will be described below based on illustrated examples. 1 to 6 are diagrams showing one embodiment of the present invention. First, to explain the configuration, 1 shown in FIG.
It is a rotating drum in the shape of a disk, and the outer periphery of the rotating drum 1 has V-shaped grooves 11 extending in the axial direction at equal angles in the circumferential direction, as shown enlarged in FIGS. 2 to 5. By providing a large number of sawtooth protrusions 10 protruding outward in the radial direction, the same number as the number of V grooves 11 is formed, and a set of protrusions 10 provided at equal intervals in the circumferential direction is formed. In the embodiment, they are formed in four rows, that is, four strips. The top surfaces of these protrusions 10 are curved and are formed to expand in the tangential direction, and each top surface constitutes a small surface 10a to which molten metal 2, which will be described later, is adhered in the form of a foil. Then, a wall surface 10 on the rear side in the rotation direction F of each V groove 11 forming each protrusion 10 is provided.
b is formed to be perpendicular to the facet 10a so that the axial center line of the rotating drum 1 exists on an extension of the plane, and a wall face 10c on the front side in the rotation direction F.
is a certain inclination angle θ that is not perpendicular to the facet 10a
so that they intersect with each other. The inclination angle θ is preferably 10 degrees or more and 45 degrees or less,
If the angle is less than 10 degrees, the molten metal tends to adhere to the front wall surface 10c, making it impossible to obtain a flat metal chip.
There was a tendency for molten metal to splash, making stable operation difficult. The rotating drum 1 is made of, for example, pure copper or copper alloy (for example, 0.2% Zr-99.8% Cu, 0.9% Cr-99.1% Cu).
etc.), and thereby removes heat from the molten metal 2 adhering to the facet 10a of the protrusion 10, so that its solidification progresses quickly. Further, 3 shown in FIG. 1 is a drive device for rotating the rotary drum 1 at high speed,
For example, it is composed of an electric motor, a transmission, etc.
This is connected to the rotating shaft of the rotating drum 1.
This drive device 3 constitutes a specific example of a peeling means for peeling off the molten metal 2 adhering to the small surface 10a from the small surface 10a by centrifugal force. Therefore, the rotational speed of the rotating drum 1 is such that after at least a portion of the molten metal 2 adhering to the small face 10a formed on the outer circumferential surface of the protrusion 10 solidifies, the foil-like metal chips 20 are transferred to the rotating drum. The speed is set at such a speed that the centrifugal force applied by the rotational force of 1 can be used to scatter the particles from the facet 10a. Further, the rotary drum 1 is configured to be able to be raised and lowered in the vertical direction by a lifting device (not shown), and when the rotary drum 1 is not in operation, it is located above the molten metal 2, and when it is in operation, it is lowered and lowered to the protrusion 10 at the lower end. small face 10
a is brought into contact with the surface of the molten metal 2 accommodated in the melting tank 6 of the melting device 5 disposed below. The melting device 5 includes a melting tank 6 made of a fireproof material such as graphite or alumina, a structural material, etc.
The molten metal 2 in the melting tank 6 is always maintained at a predetermined temperature by heating the melting tank 6 with the heating element 7. As the molten metal 2, various metal materials such as cast steel, ordinary steel, stainless steel, aluminum alloy, lead, etc. can be used, and each of these materials is formed into a substantially rectangular foil-like metal chip 20.
is formed into. Further, 4 shown in FIG. 1 is a wiper showing another specific example of the peeling means, and each small surface 1 of the rotating drum 1
The molten metal 2 adhering to the small surface 10a is not peeled off by the centrifugal force, and the foil-like metal chip 20 that remains adhered to the face 10a is removed by wiping. Furthermore, numeral 8 in the figure is a level block for adjusting the height of the liquid level of the molten metal 2. For example, a refractory material such as a brick is configured to be movable up and down, and this level block 8 is made of a foil metal chip. By moving it up and down according to the production amount of 20, the liquid level is always maintained at a predetermined height. Furthermore, 9 is a heating device for heating the molten metal 2 in the lower part of the rotating drum 1 and the part in contact with this, and suppresses the molten metal 2 from being cooled by the surrounding atmosphere. Next, the effect will be explained. First, the molten metal 2 is stored in the melting tank 6 of the melting device 5. For example, molten metal 2 such as stainless steel is melted in a melting furnace (not shown) and placed in a melting tank 6, and this melting tank 6 is heated by a heating element 7 to keep the molten metal 2 at a constant temperature. Keep warm.
At the same time, in order to prevent air caught up in the rotating drum 1 and blown onto the surface of the molten metal 2 from causing a drop in the temperature of the molten metal 2, the surface temperature of the molten metal 2 is controlled by a heating device 9. Make sure to keep it at a high temperature. The temperature adjustment of the molten metal 2 is automatically controlled by a temperature adjustment device (not shown). From this state, the drive device 3 is rotated to rotate the rotary drum 1 at a high speed. Then, the elevating device is operated to lower the rotating drum 1, and the small surface 10a at the tip of the protrusion 10 on the lower side of the rotating drum 1 is brought into contact with the molten metal 2. As a result, the molten metal 2
However, a certain amount of molten metal 2 adheres to the entire facet 10a in a foil-like manner as shown in FIG. and rotated integrally with each protrusion 10. Then, the droplets 2a of the molten metal 2 adhering to the facet 10a begin to solidify due to heat being removed by the rotating drum 1 having high thermal conductivity, or in addition to this, heat being removed by the surrounding atmosphere. When some of the droplets 2a begin to solidify and turn into metal chips 20, the metal chips 20 are blown away by the centrifugal force caused by the rotation of the rotating drum 1, and the small surface 1
It peels off from 0a and is scattered into the atmosphere. Since the metal chip 20 in flight is at least partially solidified when it is peeled off from the facet 10a, it is sufficiently cooled and solidified by the surrounding atmosphere without changing its shape much. As a result, as shown in FIG. 6, a foil-like substantially rectangular metal chip 20 is obtained. Further, the metal chips 20 that are not peeled off from the facet 10a due to the centrifugal force are wiped away by the wiper 4 and peeled off from the facet 10a. Therefore, by using the wiper 4 in addition to the centrifugal force generated by the drive device 3, the metal chips 20 are removed from the rotating drum 1.
can be reliably removed and stable operations can be ensured. Next, an experimental example of the present invention will be explained. Table 1 shows the material and dimensions of the rotating drum 1 used in this experiment. The conditions of this experiment are shown in Table 2.

【table】

【table】

〔Effect of the invention〕

As explained above, in this invention, molten metal is brought into contact with a small surface provided on the outer peripheral surface of a rotating drum so as to extend in a tangential direction, and heat is removed from the molten metal attached in a foil-like manner to the small surface. After being at least partially solidified, the foil metal chip was peeled from the facet. Therefore, foil-like metal chips having a rectangular shape or a shape similar to the rectangular shape can be continuously manufactured in large quantities by an extremely simple method. Moreover, the device has an extremely simple structure, consisting of a rotating drum with a facet to which molten metal is attached, and a drive device that rotates this rotating drum, so the device itself can be manufactured at low cost. , it is possible to provide an economical apparatus for manufacturing foil metal chips that does not take up much space for installation and has excellent productivity.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing essential parts of a rotating drum according to the present invention, FIG. 3 is a sectional view taken along the line -- in FIG. 2, and FIG. is an enlarged perspective view showing the main part of FIG. 2, FIG. 5 is an explanatory view showing the state in which molten metal is attached to the face of the rotating drum, and FIG. 6 is a perspective view of a foil-shaped metal chip according to the present invention. , FIG. 7 is an explanatory view of the main parts showing another embodiment of the rotating drum, FIGS. 8 a to c are sectional views taken along the line -- in FIG. 7, and FIG. 9 is a perspective view showing the main parts of the conventional rotating drum. 10 are perspective views showing an example of a metal chip manufactured by a conventional apparatus. DESCRIPTION OF SYMBOLS 1... Rotating drum, 2... Molten metal, 3... Drive device, 4... Wiper (peeling means), 5... Melting device, 6... Melting tank, 7... Heating element, 8... Level block , 9... heating device, 10... protrusion, 1
0a...Small surface, 10b, 10c...Wall surface, 20...
...Foil metal chip.

Claims (1)

[Scope of Claims] 1. A large number of facets provided so as to extend tangentially to the outer circumferential surface of a rotating drum are sequentially brought into contact with molten metal housed in a melting tank, and these facets are A foil-like structure characterized in that a molten metal is attached in a foil-like manner, heat is removed from the foil-like molten metal to at least partially solidify the metal, and then the foil-like metal chips are peeled off from the facets. Method of manufacturing metal chips. 2 The molten metal contained in the melting tank has a large number of facets extending tangentially to the outer circumferential surface, and the molten metal is attached in the form of a foil to the surface of these facets, and heat is removed from the molten metal. The present invention is characterized by comprising: a rotating drum that removes and solidifies at least a portion of the foil-like metal chips; and a peeling means that peels off the foil-like metal chips that have adhered to the facets and at least partially solidified them from the facets. Foil metal chip manufacturing equipment. 3. The apparatus for producing foil-like metal chips according to claim 2, wherein the peeling means is a stirring device that rotates the rotating drum and peels the chips by its centrifugal force. 4. The foil metal chip manufacturing apparatus according to claim 2, wherein the peeling means is a wiper that wipes the outer periphery of the rotating drum.