JPH0390503A - Apparatus for manufacturing quench solidified powder - Google Patents

Abstract

PURPOSE:To manufacture quench solidified powder without any fear of mingling the foreign matter with good workability by taking out the powder together with cooling liquid from a discharging hole at bottom part of a rotary drum after quenching and solidifying molten metal in the cooling liquid later formed on inner circumferential face of the rotary drum. CONSTITUTION:The cooling liquid is poured into the rotary drum 1 rotating around the axis from a pouring pipe 9. This cooling liquid forms the cooling liquid layer 10 on the inner circumferential face of rotary drum 1 with centrifugal force of rotation. On the other hand, the molten metal 18 is produced in a vessel 19 providing high frequency coil 24 on the outer peripheral face. Inner part in the vessel 19 is pressurized with gas and the above molten metal 18 is injected from an injection hole 23. By this method, the molten metal 18 is quenched and solidified in the cooling liquid layer 10 to form the metal powder. After that, the rotation of rotary drum 1 is stopped. By this method, the above quench solidified powder is discharged together with the cooling water from a discharging hole 6 formed as penetrating on the bottom face 3 of rotary drum 1 and collected in a collector 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for producing rapidly solidified powder with excellent productivity.

(Prior Art) Rapidly solidified metal powder has fine crystal grains and can contain supersaturated alloying elements. For example, extruded materials formed from rapidly solidified powder of aluminum alloys have excellent material properties that cannot be provided by ingot materials, and are attracting attention as materials for mechanical parts and the like.

A suitable method for producing the rapidly solidified powder is, for example, the method for producing metal powder disclosed in Japanese Patent Application No. 61-235033 and Japanese Patent Application No. 61-84487. As shown in FIG. 5, in this method, a cooling liquid layer 42 is formed on the inner circumferential surface of a rotating drum 41 that rotates about an axis in the vertical direction by the action of centrifugal force, and the cooling liquid layer 42 is filled with molten metal. 43 is injected and finely divided to obtain rapidly solidified powder.

In this case, the molten metal 43 is melted in a graphite container 46 in which an injection hole 44 is opened and a high-frequency coil 45 is attached to the outer circumferential surface, and then a lid 47 is attached to make it airtight. By injecting an inert gas under pressure into the container 46, the molten metal is injected from the molten metal injection hole 44. In addition, the graphite container 4
In some cases, molten metal that has been melted in advance is injected into 6.

After the rotating drum stops, the rapidly solidified powder formed by the above method is sucked and collected together with the cooling liquid from inside the rotating drum by an appropriate suction means, dehydrated and dried, and then heated to an appropriate processing temperature. It is then subjected to processing such as extrusion, forging, and sintering.

(Problem to be Solved by the Invention) However, when collecting the rapidly solidified powder and cooling liquid by suction, the suction hose is inserted into the rotary drum 41 from the upper surface opening 48 of the rotary drum 41, and the Since the powder dispersed in the inner bottom of 41 is collected together with the cooling liquid, the work becomes complicated.

In addition, if the powder to be manufactured next time has a different chemical composition, particle size distribution, etc. from the powder manufactured last time, clean the inner circumferential surface and bottom surface of the rotating drum to prevent powder contamination. The production powder must be completely removed, requiring cleaning and removal operations.

Furthermore, during suction and collection, foreign matter in the air may be drawn in, and there is a risk that foreign matter may be mixed into the powder.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an apparatus for producing rapidly solidified powder, which has excellent workability and is free from the risk of foreign matter being mixed into the powder.

(Means for Solving the Problems) The present invention, which has been made to achieve the above object, includes a rotary drum 1 with a bottom that is rotatably supported around an axis, and an action of centrifugal force due to the rotation of the rotary drum 1. In the rapidly solidified powder manufacturing apparatus, which is equipped with a metal molten metal injection container 19 for spouting molten metal 18 into a cooling liquid layer 10 formed on the inner circumferential surface of the rotating drum 1, the bottom surface 3 of the rotating drum 1 is A discharge hole 6 for rapidly solidified powder and coolant is formed through the discharge hole 6, and a collector 11 is provided below the discharge hole 6 to collect the rapidly solidified powder and coolant discharged from the discharge hole 6. This is the structure of the invention.

(Function) In the present invention, a discharge hole is formed through the bottom of the rotating drum, and a collector is provided below the discharge hole, so that the rapidly solidified powder and the cooling liquid can be discharged naturally by simply stopping the rotating drum. The paper is discharged from the discharge hole and stored in the collector.

(Example) Hereinafter, the present invention will be explained with reference to the drawings.

1 to 3 show an apparatus for producing rapidly solidified powder according to an embodiment of the present invention. Reference numeral 1 denotes a rotary drum with a bottom, and an opening 5 is provided on the top surface. The circumferential side part 2 of the rotating drum l is formed of a cylindrical upper circumferential side part 2a and a funnel-shaped lower circumferential side part 2b formed from an inclined surface 4 toward the bottom part 3 having a smaller diameter than the upper circumferential side part 2a. ing. and,
The upper circumferential side portion 2a+, the lower circumferential side portion 2b, and the bottom portion 3 are connected to form a rotating drum l.

A rotary shaft 8 having an axis in the vertical direction is connected to the center lower surface side of the bottom portion 3 . The rotating shaft 8 is rotatably supported by a bearing or the like, and is rotationally driven around the axis by a drive device such as a motor (not shown). On the other hand, a cooling liquid such as water or oil is supplied into the rotary drum 1 from an injection pipe 9, and coolant is generated by the rotation of the rotary drum 1 about its axis in the vertical direction as the rotary shaft 8 rotates. Due to the action of centrifugal force,
A cooling liquid layer IO is formed by sticking and holding a cooling liquid in a layer on the inner circumferential surface of the circumferential side portion 2 of the rotating drum. The cooling liquid layer 10 is moving at high speed along the inner peripheral surface of the drum 1 as the rotating drum 1 rotates.

A discharge hole 6 for rapidly solidified powder and cooling liquid is formed through the outer peripheral side of the bottom portion 3 of the rotating drum 1 .

The shape of the discharge hole 6 is an appropriate shape such as an oval shape or a circle shape as shown in FIG. Further, as shown in FIG. 4, the discharge hole 6a is formed by connecting the lower end of the lower peripheral side part 2b of the rotary drum l with the outer peripheral part of the bottom part 3 with a bar 36, and dividing it into an appropriate number of parts by the bar 36. It may be formed into a circular ring shape. In this case,
If the cross section of the bar 36 in the radial direction with respect to the rotating shaft 8 is triangular, powder will not accumulate on the bar 36. Further, on the center side of the upper surface of the bottom portion 3, a guide member 7 having a conical or hemispherical shape and having an inclined surface facing the discharge hole 6 is preferably curved concentrically with the rotating shaft 8. . As the rotating drum (2) stops, the rapidly solidified powder and the cooling liquid are guided toward the discharge hole 6 by the inclined surface of the guide member 7 and the inclined surface 4 of the lower peripheral side portion 2b of the rotating drum 1, Excreted naturally.

Below the discharge hole 6, an assembly 11 for the discharged rapidly solidified powder and cooling liquid is installed. The assemblage 11 is
An inner cylinder 11a disposed near the outer circumferential surface of the rotating shaft 8 and an outer cylinder 11b having a larger diameter than the bottom 3 are arranged concentrically with respect to the rotating shaft 8. The bottom surface 11c is inclined to one side in the horizontal direction with respect to the bottom surface 11c. In addition, a part of the assembly 11 is
It extends below the slope of the bottom surface 11c, and a discharge opening 14 for introducing the rapidly solidified powder and cooling liquid into the powder recovery container 15 is provided at its tip.

The powder collection container 15 is usually formed of a mesh with openings that are narrower than the minimum particle size of the particle size distribution of the rapidly solidified powder to be collected, and is removably fixed in the drain fluid 16 by a fixture 17. There is. Then, the rapidly solidified powder and the cooling liquid are temporarily stored from the assembly 11, and the cooling liquid is discharged from the mesh to recover the rapidly solidified powder. Incidentally, the powder and cooling liquid were charged from the assembly 11 into a powder recovery container which had been charged and fixed in advance to a centrifugal dehydrator, and after being dehydrated as it was, the powder and cooling liquid were loaded into a cylindrical fluidized fluidized dryer together with the volume R51,5. It is also possible to quickly dry the container 15 by blowing hot air from below. Alternatively, it may be directly heated to the processing temperature with hot air and subjected to processing.

On the other hand, 19 is a molten metal injection container, which is formed into a cylindrical shape with a bottom, has a flange 25 on the outer peripheral edge of the upper end, and has a graphite container body 2 with an injection hole 23 for the molten metal 18 on the lower side surface.
0 and the container body 2 to seal the upper end opening of the container body 20.
It is composed of a sealing lid 2I that is detachably attached to a flange 25 of 0. A gas supply hole 22 is formed in the lid 21 for supplying an inert gas such as argon gas under pressure into the container body 20. Moreover, 24 is a high frequency coil for heating attached to the outer peripheral surface of the container body 20.

The molten metal injection container 19 is removably attached to a container holding member 26 that engages with the outer peripheral surface of the flange 25 and holds the injection container 19 at a predetermined position on the rotating drum 1. The container holding member 26 is rotatably connected to an arm support base 34 fixed on a pedestal 28 via a support arm 27 . A support column 3L31 is vertically provided on the lower surface side of the pedestal 28, and the support column 31.31 is supported by a guide member fixed to the base 29 so as to be able to slide and move up and down. The pedestal 28 includes a hydraulic cylinder 3 fixed to the pedestal 29 for raising and lowering the pedestal, such as a hydraulic cylinder or an air cylinder.
2, it is raised and lowered. As the pedestal 28 moves up and down, the injection container 19 moves up and down between a predetermined molten metal injection position within the rotating drum 1 and a retracted position above the opening 5 of the rotating drum 1.

As shown in FIG. 3, one end of the support arm 27 is rotated by the tip of a rod of a hydraulic cylinder 33 for arm rotation, such as a hydraulic cylinder or an air cylinder, which is fixed on the pedestal 28. It is pivoted freely. Then, as the rod of the cylinder 33 moves in and out, the support arm 27 turns at an appropriate angle about the arm support base 34 as a fulcrum, and moves the injection container 19 to a predetermined position in the opening 5 of the rotating drum 1. and a retracted position near the outer circumferential surface of the upper circumferential side portion 2a of the rotating drum 1.

To produce rapidly solidified powder using the above-mentioned production equipment,
First, the rotary drum 1 is rotated at a low speed by the rotary shaft 8, and a suitable amount of cooling liquid is supplied from the injection pipe 9 to form a cooling liquid layer IO. On the other hand, a predetermined amount of molten metal is poured into the container body 20 of the molten metal injection container 19 at a retracted position near the outer peripheral surface of the peripheral side portion 2 of the rotating drum 1, and the lid 21 is attached to the injection container 19. Seal it tightly. At this time, if the gas supply hole 22 or a through hole separately provided in the lid body 21 is connected to a pressure reducing device such as a vacuum pump or an ejector to maintain the inside of the injection container 19 in a reduced pressure state, the injection container 19 This is preferable because the molten metal 18 contained therein is prevented from leaking from the injection hole 23.

Next, the rotation of the rotary drum 1 is increased to a predetermined rotation speed at which rapidly solidified powder can be produced. Then, the rod of the arm pivoting hydraulic cylinder 33 is retracted, the support arm 27 is pivoted, and the injection container 19 is moved to the retracted position above the opening 5 of the rotary drum 1. Furthermore, by retracting the rod of the gantry raising/lowering fluid pressure cylinder 32 and lowering the gantry 28, the injection container I9 is inserted into the rotating drum 1 and fixed at the molten metal injection position. Then, inert gas is fed into the injection container 19 from the gas supply hole 22, the molten metal is injected from the injection hole 23 toward the coolant JWIO, the molten metal collides with the coolant layer, and is finely divided. A rapidly solidified powder is formed.

After the molten metal injection is completed, as the rotating drum 1 stops, the rapidly solidified powder and the cooling liquid descend along the slope 4 of the lower peripheral side 2b of the rotating drum 1 and the slope of the guide member 7, and reach the bottom 3. is guided to the discharge hole 6 and is naturally discharged from the discharge hole 6. Then, it is accommodated in a collector ll provided below the discharge hole, and is introduced into a powder recovery container 15 through a discharge opening 14 provided at one end of the collector 11 . Therefore, there is very little possibility that foreign matter in the air will be drawn in during powder recovery.

On the other hand, the rod of the hydraulic cylinder 32 for raising and lowering the gantry is extended to move the injection container 19 upwardly to the retracted position above the rotary drum 1, and then the rod of the hydraulic cylinder 33 for arm rotation is extended, and the injection container 19 is 19 is the peripheral side part 2 of the rotating drum 1
swivels to a retracted position near the outer circumferential surface of the At this position, pour the molten metal into the injection container 19 again, and perform the operations described above.
A rapidly solidified powder is produced repeatedly.

In addition, if the rotating drum 1 is suddenly stopped after the molten metal injection is finished,
Due to inertia, the rapidly solidified powder and cooling water are transferred to the rotating drum 1.
Since the powder is discharged from the discharge hole 6 while moving circularly around the inner peripheral surface of the peripheral side part 2, there is very little powder remaining attached to the inner peripheral surface of the rotating drum 1, which reduces the cleaning work of the drum 1. be done.

Moreover, if the injection container 19 is moved vertically by the hydraulic cylinder 32 for raising and lowering the gantry while injecting the molten metal toward the cooling liquid layer 10, the position where the injected molten metal collides with the cooling liquid layer can be adjusted to Since the cooling liquid layer can be moved in the vertical direction, a decrease in cooling capacity due to a local temperature rise in the cooling liquid layer is prevented.

Although the molten metal was injected into the molten metal injection container in this example, the present invention is not limited to this, and the ingot is charged into the injection container and melted with a high frequency coil to prepare the molten metal. Of course you can.

(Effects of the Invention) According to the present invention, the discharge hole for the rapidly solidified powder and the cooling liquid is formed through the bottom surface of the rotating drum, and the rapidly solidified powder and the cooling liquid discharged from the discharge hole are assembled below the discharge hole. Since a collector is provided for this purpose, simply by stopping the rotating drum, the quenched solidified powder and cooling liquid are naturally discharged from the discharge hole and stored in the collector. Therefore, the suction and collection work can be omitted, and the inner surface of the rotating drum can also be easily cleaned, resulting in excellent workability.

[Brief explanation of drawings]

1 is a cross-sectional explanatory diagram of a main part of a manufacturing apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional diagram taken along line A-A in FIG. 1, FIG. 3 is a plan explanatory diagram of FIG. 1, and FIG. FIG. 7 is an explanatory cross-sectional view showing a discharge hole of a rotating drum of a manufacturing apparatus according to another embodiment. FIG. 5 is an explanatory cross-sectional view of essential parts showing an example of a conventional rapidly solidified powder manufacturing apparatus. 1... Rotating drum, 3... Bottom surface, 6... Discharge hole,
DESCRIPTION OF SYMBOLS 10... Cooling liquid layer, 11... Collection device, 18... Metal molten metal, 19... Metal molten metal injection container.

Claims (1)

[Claims] (1) A rotary drum (1) with a bottom that is rotatably supported around its axis, and a cooling liquid formed on the inner peripheral surface of the rotary drum (1) due to the centrifugal force caused by the rotation of the rotary drum (1). Layer (1
0) a molten metal injection container (19) for spouting molten metal (18) into a molten metal injection container (19); A liquid discharge hole (6) is formed through the liquid discharge hole (6).
An apparatus for producing rapidly solidified powder, characterized in that a collector (11) is provided below the discharge hole (6) for collecting the rapidly solidified powder and cooling liquid discharged from the discharge hole (6).