JPH0132177B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to flaky metal chips that are kneaded into the surface layer of a concrete floor or the like to improve the wear resistance of the surface layer, and an apparatus for manufacturing the same. To manufacture small (for example, 3.0 mm or less in diameter) flaky metal chips in large quantities by a simple method and by a device with a simple structure. [Prior art and its problems] In general, concrete floors of concrete buildings, etc., have relatively low hardness and are soft.
Wear is caused not only by hard items such as iron products, but also by rubbing against relatively soft items such as wood. Therefore, in recent concrete floor construction methods, metal particles are kneaded or dispersed into the surface layer to increase the hardness of the surface layer, thereby improving the abrasion resistance etc. of the concrete floor surface. This is to prevent cracks from occurring on the floor. Conventionally, metal particles used for reinforcing concrete and the like are finely crushed chips generated by lathe processing, etc., or chips obtained when shaping the tips of nails, etc. was used. Therefore, not only is the production efficiency of metal particles low, but also their shape is often non-uniform, making it difficult to mix them into concrete evenly. In addition, since the conventional metal particles described above had many sharply pointed parts, the sharply angled parts sometimes protruded into the concrete surface layer, which caused problems in terms of safety after construction. [Purpose of the Invention] The present invention has been made by focusing on such conventional problems, and it is an object of the present invention to produce a piece of metal chip without sharply pointed parts by a simple method and into a device with a simple structure. Therefore, the purpose is to enable continuous production in large quantities. [Structure of the Invention] The present invention relates to a flaky metal chip characterized by having a bowl-shaped vertical cross-sectional shape with one side protruding and the other side being concave, and also relates to an invention of an apparatus for manufacturing the same. , a level block that is immersed in the molten metal and adjusts the height of the liquid level of the molten metal according to the amount of immersion; A rotary drum having a bowl-shaped protrusion on the outer periphery to which metal is attached to the tip thereof, and a peeling means for peeling off the molten metal from the protrusion after at least a portion of the molten metal attached to the protrusion is solidified. The present invention relates to an apparatus for manufacturing flaky metal chips, and further relates to an apparatus in which a heating device is added to the manufacturing apparatus to heat a portion of the liquid surface of the molten metal into which the rotating drum is inserted. [Relationship with other known technologies] By the way, there is a technology described in Japanese Patent Application Laid-Open No. 54-60262 that may seem at first glance to be similar in the creation of a technical idea to the present invention. There is a method for forming flaky particles and an apparatus therefor. The flake particles are formed by: (a) rotating a heat extraction disk having a tapered serrated edge; (b) injecting the serrations of the edge of the disk into the surface of the molten material; (c) releasing the particles from the serrations; (c) removing heat from the particles to at least partially solidify the particles on the serrations; (d) cooling the particles in the surrounding atmosphere; Therefore, as described in detail in the following examples, the technical idea is different from the present invention. [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. On the outer periphery of this rotating drum 1, as shown in enlarged form in FIGS. In this embodiment, the sets of protrusions 10 are formed in two rows, that is, in two strips. Protrusion 10
is shaped like a tip 10a of a bowl-shaped protrusion 10 attached, and the molten metal 2 is attached to the bowl-shaped tip of the tip 10a. Such a rotating drum 1 is made of, for example, pure copper or a copper alloy (for example, 0.2% Zr~
CU, 0.9% Cr-Cu, etc.), which absorbs heat from the molten metal 2 attached to the tip 10a of the protrusion 10 and accelerates its solidification. I'll do what I do. Reference numeral 3 shown in FIG. 1 is a drive device for rotating the rotary drum 1 at high speed, and is composed of, for example, an electric motor, a transmission, etc., and is connected to the rotation shaft of the rotary drum 1. There is. This driving device 3 drives the molten metal 2 attached to the protrusion 10.
This is a specific example of a peeling means for peeling off the protrusion 10 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 attached to the projections 10 provided on the outer periphery solidifies, the molten metal 2 is subjected to centrifugal force applied via the rotating drum 1. Therefore, the tip 10a of the protrusion 10
Set the speed so that it can be dispersed. 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 is located above the molten metal 2 when it is not in operation, and when it is in operation, it descends to the tip 10a of the protrusion 10 at the lower end. is inserted into the molten metal 2. The molten metal 2 is stored in a melting tank 6 of a melting device 5 disposed below the rotating drum 1. Examples of the metal particles include cast steel, ordinary steel, stainless steel, aluminum alloy,
It can be manufactured using various metal materials such as lead. 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. Further, 4 shown in FIG. 1 is a wiper showing another specific example of the peeling means, and the molten metal 2 attached to the tip 10a of the protrusion 10 is not peeled off even by the centrifugal force. The metal chip 20 that remains attached to the chip 10a is removed by wiping it off. Further, reference numeral 8 in the figure is a level block for adjusting the height of the liquid level of the molten metal 2, which is made of a fireproof material such as brick, and is made of a metal chip 20.
The liquid level is always maintained at a predetermined height by moving it up and down according to the production amount. 9 is a heating device for heating the lower part of the rotating drum 1 and the molten metal 2 in the part where this is inserted;
This suppresses cooling of the molten metal 2 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, a molten metal 2 such as stainless steel melted in a melting furnace (not shown) is stored 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 predetermined temperature at all times. do.
At the same time, the surface temperature of the molten metal 2 is lowered by the heating position 9 in order to prevent the air caught 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. 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 lifting device is operated to lower the rotating drum 1, and the tip 10a of the protrusion 10 on the lower side of the rotating drum 1 is inserted into the molten metal 2. As a result, the molten metal 2 becomes
The tip 10a of the protrusion 10 in the state shown in FIG.
As a result, a certain amount of molten metal 2 corresponding to the insertion amount is pulled up by the tip 10a and rotated integrally with each protrusion 10. Then, the droplet 2a of the molten metal 2 adhering to the tip 10a begins 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 a portion of the droplet 2a begins to solidify in this way, the droplet 2a is blown off by the centrifugal force caused by the rotation of the rotating drum 1, peeled off from the tip 10a, and scattered into the atmosphere. Since at least a portion of the flying droplet 2a is solidified when it is peeled off from the tip 10a, it is sufficiently cooled and solidified by the surrounding atmosphere without changing its shape much. As a result, a substantially circular metal chip 20 having a vertical cross-sectional shape with one side protruding and the other side recessed as shown in FIGS. 5 and 6 is obtained. Further, the metal chips 20 that are not peeled off from the tip 10a even by the centrifugal force are wiped off by the wiper 4 and peeled off from the tip 10a. Therefore,
By using the wiper 4 in addition to the centrifugal force generated by the drive device 3, the metal chips 2 are removed from the rotating drum 1.
0 can be reliably removed. 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 results of this experiment are shown in Table 2. In this experiment, a circular metal chip 20 with a diameter of 1.0 to 2.0 mm as shown in FIGS. 5 and 6, and a metal chip deformed within these dimensional ranges in the shape of an ellipse or an approximation thereof were obtained. . The thickest part of these metal chips 20 has a dimension of 0.19 to 0.27 mm, and the metal chips 1
The weight per piece was 1.0-1.5 mg. The production amount per unit time was 8 kg.

【table】

〔Effect of the invention〕

As explained above, since the flaky metal chip according to the present invention is bowl-shaped and has no sharp points, it is highly safe. Therefore, it has the effect of ensuring safety even when used in areas where there is a risk of contact with the human body or clothing, such as when a large amount of this is mixed into concrete to prevent wear. There is. In addition, regarding this metal chip manufacturing equipment,
When manufacturing the metal chips continuously by rotating a rotating drum, the present invention uses a level block that adjusts the height of the liquid level of the molten metal according to the amount of immersion in the molten metal. The liquid level of molten metal, which tends to decrease as chips are manufactured, is
Since it can be maintained constant by lowering the level block, the amount of insertion of the protrusions of the rotating drum into the molten metal can always be maintained at the same level with a simple structure. This has the advantage that metal chips can be manufactured. Furthermore, when a molten metal liquid surface heating device is used in this device, this heating device heats the portion of the molten metal surface into which the rotating drum is inserted, so that the molten metal surface is heated by the surrounding atmosphere. It is always attached to the protrusion of the rotating drum at the optimum temperature without the inconvenience of cooling. Therefore, it is possible to prevent errors in manufacturing metal chips due to temperature imbalances, thereby improving manufacturing efficiency.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram showing an embodiment of the present invention, Fig. 2 is a front view showing the main parts of the rotating drum according to the invention, Fig. 3 is a sectional view taken along the line - - of Fig. 2, and Fig. 4. 5 is an explanatory view showing a state in which molten metal is attached to the tip of a protrusion of a rotating drum, and FIG. 6 is a perspective view showing a flaky metal chip according to the present invention. 1... Rotating drum, 2... Molten metal, 2a...
Droplet, 3... Drive device (peeling means), 4... Wiper (peeling means), 5... Melting device, 6... Melting tank,
7... Heating element, 8... Level block, 9... Heating device, 10... Protrusion, 10a... Tip, 20...
...Metal particles.

Claims (1)

[Scope of Claims] 1. A flaky metal chip characterized by having a bowl-shaped vertical cross-sectional shape with one side protruding and the other side concave. 2 Claim 1 whose planar shape is approximately circular
The flaky metal chips described in Section 1. 3. Molten metal contained in a melting tank, a level block that is immersed in the molten metal and adjusts the height of the liquid level of the molten metal according to the amount of immersion, and a level block that is located above the molten metal and that is immersed in the molten metal. A rotary drum having a bowl-shaped protrusion on the outer periphery to which metal is attached to the tip thereof, and a peeling means for peeling off the molten metal from the protrusion after at least a portion of the molten metal attached to the protrusion is solidified. Equipment for producing flaky metal chips. 4 Molten metal contained in a melting tank, a level block that is immersed in the molten metal and adjusts the height of the liquid level of the molten metal according to the amount of immersion, and a level block that is located above the molten metal and that is immersed in the molten metal. a rotating drum having a bowl-shaped protrusion on the outer periphery to which the molten metal is attached; a heating device that heats a portion of the molten metal surface into which the rotating drum is inserted; 1. An apparatus for producing a flaky metal chip, comprising a peeling means for peeling the chip from the protrusion after at least a portion of the chip is solidified.