JP4858181B2 - Flat metal powder production equipment - Google Patents

Description

  The present invention relates to an apparatus for producing a flat metal powder.

  Flat metal powder is used to form a radio wave absorber having excellent radio wave absorption characteristics, a magnetic material having excellent magnetic characteristics, or as a feeler for a magnetic shield coating film. In the method for producing flat metal powder, as described in Patent Document 1, the metal powder supply means uses a form in which gas is blown into a molten metal dripped from a nozzle to form powder, and the metal powder supply means A method of spraying the formed metal powder onto a rotating body rotating at high speed to form a flat metal powder, or a metal powder supplied from similar metal powder supply means as described in Patent Document 2, A method of flattening between two cooling rotating rolls (rolling rolls) that are spaced apart and arranged in parallel with each other is known.

Japanese Patent Laid-Open No. 11-140512 Japanese Patent Application Laid-Open No. 07-138618

  In the conventional method, it is understood that the method of producing a flat metal powder by injecting the metal powder supplied from the metal powder supply means onto a rotating body that rotates at high speed can be produced with high yield if the flat metal powder has a low specific gravity. However, it is not easy to produce a uniformly flat metal powder without aggregation, and the operation control of the apparatus becomes complicated.

  The method of flattening the metal powder supplied from the metal powder supply means between a pair of rolling rolls arranged in parallel is to uniformly flatten the metal powder according to the distance between the rolls regardless of the specific gravity of the material. Can be manufactured. However, the material pulverized by injecting gas to the molten metal flow reaches the gap between the pair of rolling rolls through the plurality of dropping paths from the nozzle tip of the metal powder supply means. The converted material tends to form aggregates. Further, when a large amount of metal powder is introduced between the rolls, it tends to be an agglomerate even on the rolling roll. In addition, the powder that collides with the rolls rebounds, so that the powders overlap each other and agglomeration is likely to occur.

  Since the agglomerated powder lump is rolled as it is between a pair of rolling rolls, the powder discharged from the rolling roll has a shape in which flat metal powder is agglomerated. Since such agglomerated flat metal powder is a defective product and excluded from the manufactured product, it has been difficult to obtain a good product (that is, an individually independent state) of flat metal in a high yield.

  The present invention has been made in view of the above circumstances, and in an apparatus for producing a flat metal powder in a form in which a metal powder supplied from a metal powder supply means is rolled between a pair of rolling rolls to form a flat metal powder. It is an object to be able to obtain a good flat metal powder with high yield.

  An apparatus for producing a flat metal powder according to the present invention is a flat metal powder comprising at least a pair of rolling rolls arranged to face each other at a predetermined interval, and a metal powder supply means for supplying the metal powder to the rolling roll. In the manufacturing apparatus, the metal powder supply means includes a separation means for separating the agglomerated powder.

  The flat metal powder manufacturing apparatus according to the present invention includes a separating means for separating the agglomerated metal powder by the metal powder supply means, and therefore prevents the agglomerated metal powder from being fed between a pair of rolling rolls. be able to. As a result, the production of the aggregated flat metal powder is suppressed, and a good flat metal powder can be produced in a high yield.

  Preferably, the metal powder supply means includes a casing, a first position housed in the casing and in line contact with one of the pair of rolling rolls, and a second position spaced apart from the rolling roll in line contact. One or a plurality of contact rods movable between the two positions.

  In this form of the flat metal powder manufacturing apparatus, the metal powder passes through only the path between the contact rod and any one of the rolling rolls in line contact with the contact rod, and is sent to the rolling region between the pair of rolling rolls. . Even if the metal powder is in an aggregated state before reaching the area of the contact rod, it is in a state of being separated individually in the process of passing between the contact rod and the rolling roll in which it is in line contact. Since the separated metal powder is sequentially sent to the rolling region of the pair of rolling rolls through only the single path, a good flat metal powder can be obtained with high yield.

  The flat metal powder manufacturing apparatus according to the present invention preferably has a mechanism for vibrating the metal powder supply means, and the movement of the contact rod is configured to occur when the metal powder supply means vibrates. By providing such a vibration mechanism, the separation of the agglomerates is further ensured.

  In the flat metal powder manufacturing apparatus according to the present invention, the means for guiding the metal powder to the contact rod region is not particularly limited. When reaching the area of the contact rod, it is desirable that the metal powder is not agglomerated or, if any, small agglomerates, so that it passes between the contact rod and the rolling roll with which it is in line contact. Then, the metal powder can be completely separated.

  Therefore, in a preferred aspect of the flat metal powder manufacturing apparatus according to the present invention, the metal powder supply means extends in the same direction as the contact rod and can freely rotate at an upper position of the contact rod in the casing. And a plurality of crushing rods housed in (1). The metal powder to be processed put into the casing passes between the plurality of grinding rods, then passes between the contact rod and the rolling roll, and then between the pair of rolling rolls. It is rolled flat. It is further preferable that the mechanism for vibrating the metal powder supply means vibrates the casing.

  In this aspect, the metal powder charged in the casing is rotatably accommodated in the casing, and preferably passes through a plurality of crushing rods that vibrate by the action of the vibration mechanism. Pretreatment such as separation from the lump state or dispersion in the roll width direction is performed. When the pretreated metal powder passes between the contact rod and the rolling roll, further separation into individual metal powder proceeds, and it is rolled flat between the pair of rolling rolls. Therefore, the yield of the flat metal powder that is a non-defective product is further improved. In addition, the processing time is shortened.

  By using the flat metal powder production apparatus according to the present invention, a good flat metal powder can be produced in a high yield.

  Hereinafter, a flat metal powder production apparatus according to the present invention will be described based on an embodiment with reference to the drawings. FIG. 1 is a top perspective view showing the entire flat metal powder manufacturing apparatus, and FIG. 2 is a cross-sectional view showing the main part of the manufacturing apparatus.

  An apparatus A for producing flat metal powder according to the present invention has a casing 10, an inlet 11 for the metal powder 1 is formed above the casing 10, and an outlet 12 is formed at the lower end. A pair of rolling rolls 20a and 20b are arranged opposite to each other in the direction close to the discharge port 12 and along the longitudinal direction of the discharge port 12 so as to maintain a predetermined interval. The pair of rolling rolls 20a and 20b have rotating shafts 21 and 21, and are rotated in the direction of the arrow by a driving device (not shown). Preferably, the distance between the axes of the rotary shafts 21 and 21 is adjustable, and the distance between the axes is adjusted and set according to the thickness of the flat metal powder 1a to be obtained by an appropriate control mechanism (not shown). The

  A plurality (three in the illustrated example) of contact rods 13a, 13b, and 13c are accommodated on the discharge port 12 side of the casing 10 so as to be freely rotatable. Each of the contact rods 13a, 13b, 13c has a first position (position shown in the drawing) and the line in line contact with either one of the pair of rolling rolls 20a, 20b, in the illustrated example, the right rolling roll 20b. It is accommodated in the casing 10 so as to be movable between a second position separated from the rolling roll 20b that is in contact therewith. As shown in the figure, the side of each contact rod 13a, 13b, 13c opposite to the side in line contact with the rolling roll 20b is covered with a casing 10 in a substantially sealed state. The contact rods 13a, 13b, 13c and the canning 10 constitute a metal powder supply means according to the present invention. All or any of the contact rods 13a, 13b, 13c may be attached to the casing 10 so as to be displaceable.

  In the illustrated embodiment, the metal powder supply means extends in the same direction as the contact rods 13a, 13b, 13c disposed and accommodated in the upper position of the contact rods 13a, 13b, 13c in the casing 10, and It has a plurality of grinding rods 14... That can freely rotate.

  In the illustrated embodiment, the apparatus A has a vibration mechanism that vibrates the metal powder supply means. Although a vibration mechanism may be arbitrary, in this example, the vibrator 15 is used, and the vibration is given to the casing 10 because the vibrator 15 vibrates. Due to this vibration, the movement of each contact rod 13a, 13b, 13c proceeds more reliably between the first position (position shown in the figure) and the second position. Further, the crushing rods 14... Are also given arbitrary movement in the 360 degree direction.

  The operation of the flat metal powder manufacturing apparatus A will be described. The rolls 20a and 20b are rotated in the direction of the arrows by a drive mechanism (not shown). Further, when necessary, the vibrator 15 is operated to vibrate the casing 10. In this state, the metal powder 1 manufactured by blowing gas to the molten metal is charged from the charging port 11. The charged metal powder passes between the grinding rods 14 and gradually falls while spreading in the axial direction of the grinding rod 14. In the process, when there is a lump of metal powder, pretreatment such as individual pulverization and separation proceeds. When the casing 10 is vibrated, this pretreatment proceeds more reliably.

  The charged metal powder 1 reaches the contact rods 13a, 13b, and 13c. As described above, the side opposite to the side in contact with the rolling roll 20b of each contact rod 13a, 13b, 13c is covered with the casing 10 in a substantially sealed state, so as shown in FIG. The metal powder 1 is guided so as to pass between the contact rods 13a, 13b, 13c and the rolling roll 20b. The pretreated metal powder 1 passes between the contact rod 13 and the rolling roll 20b, so that even if the lump-like metal powder remains, it is in a state of being separated individually.

  The separated metal powder 1 passes only between the contact rod 13 and the rolling roll 20b, which are only one supply path, and is sequentially sent to the rolling region of the pair of rolling rolls 20a and 20b, where it is pressed and flattened. It becomes the metal powder 1a. As described above, when the flattening treatment is performed, since the powders are individually separated, a good flat metal powder 1a can be obtained with a high yield.

  Hereinafter, the present invention will be described with reference to examples and comparative examples.

[Example]
An apparatus for producing a flat metal powder having the shape shown in FIGS. 1 and 2 was prepared. The contact rods 13a, 13b, and 13c had a rod diameter of 6 mm. In addition, vibration of 60 Hz was applied to the casing 10 by the vibrator 15. The rolling rolls 20a and 20b were 50 mm in roll shape and 80 mm in width, and were rotated at 20 rpm. Metal powder 1 having an average particle diameter of 180 μm produced by blowing gas onto molten metal was put into casing 10, and flat metal powder 1 a having a thickness of 50 μm after flattening was taken out from rolling rolls 20 a and 20 b. However, the amount of flattening treatment per hour (kg / hr) was changed by adjusting the input amount of the metal powder 1. The weight of the aggregated powder contained in the obtained flat metal powder 1a was measured and the ratio with respect to the whole processing amount was computed. The results are shown in the graph of FIG. 3 as a new manufacturing method.

[Comparative example]
An apparatus in which the contact rods 13a, 13b, 13c and the grinding rod 14 are removed from the flat metal powder manufacturing apparatus used in the example is manufactured, and the flat metal powder is manufactured using the apparatus in the same manner as in the example. The weight of the agglomerated powder contained in was measured, and the ratio to the total processing amount was calculated. The result is shown as a conventional method in the graph of FIG.

[Evaluation]
As shown in the graph of FIG. 3, in the case of the flat metal powder manufacturing apparatus (new manufacturing method) according to the present invention, the amount of powder aggregation was 0 up to a processing amount of 3.8 kg / hr. On the other hand, in the comparative example (conventional method), when the amount exceeds 0.2 kg / hr, the amount of agglomerated powder is increased. By using the flat metal powder manufacturing apparatus according to the present invention, the processing speed is improved 19 times. You can see that

The perspective view seen from the top which shows the whole manufacturing apparatus of a flat metal powder. Sectional drawing which shows the principal part of the manufacturing apparatus of the flat metal powder shown in FIG. The graph which shows the difference in the processing speed by an Example and a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS A ... Manufacturing apparatus of flat metal powder by this invention, 1 ... Metal powder, 1a ... Flat metal powder, 10 ... Casing, 11 ... Metal powder inlet, 12 ... Discharge port, 13, 13a, 13b, 13c ... Contact rod 14 ... Rod for grinding, 15 ... Vibrating mechanism (vibrator), 20a, 20b ... A pair of rolling rolls, 21 ... Rotating shaft of rolling roll

Claims (4)

A flat metal powder production apparatus comprising at least a pair of rolling rolls arranged so as to keep a predetermined distance, and a metal powder supply means for supplying metal powder to the rolling roll,
The metal powder supply means includes a casing, a first position housed in the casing and in line contact with any one of the pair of rolling rolls, and a second position spaced apart from the rolling roll in line contact. A flat metal powder manufacturing apparatus comprising one or a plurality of contact rods movable between the two. The metallic powder supply has a mechanism for vibrating the means flat metal powder production apparatus as claimed in claim 1, wherein the movement of the contact rod, characterized in that caused by the metallic powder supply means to vibrate. The metal powder supply means further includes a plurality of crushing rods that extend in the same direction as the contact rod and are accommodated in a freely rotatable state at a higher position of the contact rod in the casing. The metal powder to be processed put into the casing passes between the plurality of grinding rods, then passes between the contact rod and the rolling roll, and then between the pair of rolling rolls. The flat metal powder manufacturing apparatus according to claim 1 , wherein the flat metal powder is rolled flat. The flat metal powder manufacturing apparatus according to claim 3 , wherein the mechanism for vibrating the metal powder supply means vibrates the casing.

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