JPH06136403A - Device for supplying powder to mold - Google Patents

Abstract

PURPOSE:To feed the fixed quantity of magnetic powder having high condensibility and to improve the packing density thereof. CONSTITUTION:This method consists in traversing a powder feed box 19 by means of a forward and backward moving device 20 to position this box in the upper part of molds 13 and dropping and packing the powder M received in the powder feed box 19 by a counting feeder into the molds 13. The powder M is sieved into the molds 13 while the powder is loosened by a perforated or net-like powder receiving rack 23 which is provided in the above-mentioned powder feed box 19 and is kept vertically vibrated by an exciting machine 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supplying and filling powder (for example, powder for powder metallurgy) into a molding die such as a rubber die.

[0002]

2. Description of the Related Art Generally, in powder metallurgy or the like, when powder is pressed and solidified by a cold isostatic pressing device,
Powder is supplied and filled in a preforming die (hereinafter simply referred to as a forming die) to perform prepressurization. Conventionally, as shown in FIG. 10, a method for supplying powder to a molding die uses a nozzle 43 provided at an outlet of a casing 42 of a metering screw feeder 41,
The powder M is dropped by gravity through a rubber hose 44 into a powder feeding box 46 placed on a press table 45, and a ball screw 48 driven by a motor 47 advances the powder feeding box 46 to move the molding die. It is located at the upper part of 49 (shown by a chain double-dashed line in FIG. 10) and applies powder M to the mold while vibrating the powder feeding box 46.
It is something to drop into 49.

The bottom surface of the powder feeding box 46 is a molding die.
Since it slides back and forth on the upper surface of 49, it is ground and the powder M can be supplied by the capacity of the molding die 49. In FIG. 10, reference numeral 50 is an upper pressure punch of the magnetic field press, and 51 is a lower pressure punch thereof, which are arranged above and below the molding die 49. 52 is a support and 53 is a stopper. In addition, the bottom plate 54 of the powder feeding box 46 is made of a perforated plate, and on the four round bottoms,
A rubber 55 is attached in order to reduce the gap with the press table 45 and improve sliding.

[0004]

In the above-mentioned prior art, since the molding die 49 is a mold, it is possible to repeatedly supply the required amount of powder into the molding die 49 every time. But,
If the mold 49 is made of rubber, that is, the cavity of the rubber mold is flexible, and if the powder feeding box 46 is used for grinding, the rubber mold will be deformed and it will not be able to maintain a predetermined shape, and a fixed amount of powder will be supplied. There is a problem that you can not do.

Further, since the relative position of the cavity of the rubber mold and the powder feeding box 46 changes and the bottom opening area of the powder feeding box 46 changes depending on the stop position of the powder feeding box 46, the amount of powder feeding is not constant. There is. The present invention has been made in view of the above-described actual circumstances, and the purpose thereof is to be able to quantitatively supply not only normal powder but also highly condensable magnetic powder, and It is an object of the present invention to provide a powder supply device for a molding die capable of increasing the packing density and capable of uniformly packing.

[0006]

In order to achieve the above object, the present invention takes the following technical means. That is, the present invention is a powder supply device for dropping powder filled in a powder feeding box by a quantitative feeder into a molding die by laterally moving the powder feeding box and dropping the powder into the molding die. The present invention is characterized in that a porous or mesh-shaped powder receiving rack is arranged inside the box, and a vibrator for vibrating the powder receiving rack is provided.

[0007]

According to the present invention, a certain amount of powder is dropped from the quantitative feeder through the supply pipe into the powder feeding box, while the molding die is placed on the press table and the lower lid is placed inside the molding die. Is dropped. The powder feeding box moves forward and is positioned on the forming die, and the receiving rack vibrates up and down to loosen the powder and condense it, so that the powder is sieved into the forming die. Then, a constant volume is supplied by scraping due to the forward and backward movement of the powder feeding box, but the powder in the molding die is agitated by a brush or an agitator provided in the powder feeding box and biased to the end part in the molding die. Filled uniformly without.

The powder supplied into the molding die is vibrated by a vibrator (or a tapping machine) arranged below the molding die to increase the packing density and then preformed by a pressure machine. Pressurization is performed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an example of an apparatus for carrying out the present invention,
1 is a rotary base, 2 is a rotary drive shaft, and the shaft 2 is a base 3 and a bearing base.
It is rotatably erected via 4 and is driven by a drive means (not shown).
It is designed to rotate intermittently at intervals of 60 degrees, and the turntable 1 is attached to its upper end. Reference numeral 5 is a powder feeding box sliding table, the upper surface of which is flush with the upper surface of the rotary table 1, and the end of the rotary table 1 side is approximately the same as the curvature of the outer peripheral surface of the rotary table 1 and is installed so as not to come into contact with it. It is provided.

The rotary table 1 is provided with molding die fitting holes 6 having the same diameter at 60 intervals at six positions on the same circumference.
A molding die support plate 8 having a pressure plate insertion hole 7 in the center is detachably attached to the lower end of each hole 6, and six station I,
II, III, IV, V and VI are constructed. And, in each of the stations I to VI, except for the fifth station V, the work tables 9, 10, 11, 12 and the slide table 5 are provided flush with the upper surface of the rotary table 1 (FIG. 4 to FIG. 4). (See FIG. 9).

The first station I is located at a position where a rubber mold (molding die) 13 is set in each molding die fitting hole 6 of the rotary table 1 and is provided on a workbench 9 as shown in FIG. Loading device
The rubber mold 13 is inserted by 14. Second station II
Is a position at which the bottom lid 15 is set on the rubber mold 13, and as shown in FIG. 5, the bottom lid loading position 16 provided on the workbench 10 carries the top lid 15 into the rubber mold 13 and the upper and lower lids composed of cylinders. By the setting devices 17 and 18, the pressure plate insertion hole 7 is formed on the support plate 8.
Is set to close the.

In the third station III, a powder feeding box 19 is slidably mounted on the slide table 5 at a position for feeding the powder M to the rubber mold 13, and the reciprocating device 20 feeds the powder. The box 19 is designed to be carried in and out of the turntable 1.
As shown in FIG. 6, a powder quantitative feeder 21 equipped with a screw conveyor 21A is arranged above the sliding table 5, and a powder feeding pipe 22 made of a flexible pipe is used to feed the powder feeding box.
Powder M is introduced into 19.

As shown in FIG. 3, the powder feeding box 19 is provided inside with a movable receiving rack 23 made of a perforated plate, and one end of the receiving rack 23 is mounted so as to be vertically rotatable about a horizontal axis 24. The other end is vertically movably attached to a vibration exciter 25 attached to the outside of the powder feeding box 19, so that the receiving rack 23 vibrates vertically. Inside the lower end portion of the powder feeding box 19, rotary brushes 26, 26 are rotatably attached to the lower end surface of the powder feeding box 19 at the front and rear portions in the moving direction thereof, via the horizontal shafts 27, 27. A sealing material 28 made of sponge or the like is attached.

Further, in the third station III, as shown in FIG. 6, a vibrator 29 is arranged below the rotary table 1, and a bottom cover is provided.
The powder M supplied to the rubber mold 13 while supporting 15 from below.
Is applied to increase the packing density of the powder M. The vibration by the vibration exciter 29 can be performed while the powder M is charged into the rubber mold 13. And shaker
Instead of 29, the powder M in the rubber mold 13 can be tamped from above by a tapping machine to increase the packing density.

The fourth station IV is a position where the upper lid 30 is attached to the rubber mold 13, and as shown in FIG. 7, the upper lid carry-in device 31 provided on the workbench 11 carries in and positions the rubber lid on the rubber mold 13. Has become. The fifth station V is
As shown in FIG. 8, in the pre-pressurizing molding apparatus for powder M, pressurizers 32 and 33 are arranged above and below the rotary table 1, and upper and lower pressurizing plates 34 and 3 are provided.
5, the powder M in the rubber mold 13 is pressed through the top lid 30 and the bottom lid 15 to perform preforming.

The sixth station VI is a position where the rubber mold 13 is taken out together with the preformed powder M from the hole 6 of the turntable 1, and as shown in FIG. A rubber mold extracting device 37 equipped with 36 is provided, and a workbench is provided.
A rubber-type unloading device 39 having a chuck 38 is mounted on the top of 12. When powder M (for example, barium-ferrite powder) is supplied to the rubber mold 13 using the above apparatus, first,
As shown in FIG. 6, powder M is fed from the quantitative feeder 21 to the powder feeding box.
On the other hand, as shown in FIG. 4, the rubber mold 13 is sequentially inserted into the mold fitting hole 6 of the rotary table 1 by the carry-in device 14 as shown in FIG. Therefore, the rotary table 1 is rotated by 60 degrees, and at the second station II, the bottom lid 15 is set on the rubber mold 13 as shown in FIG. 5, and then the rotary table 1 is rotated again by 60 degrees to supply the powder feeding box 19 6 is moved forward from the state shown in FIG. 6 onto the rotary table 1 as shown in FIG. 2, and then the shaker 25 vibrates the receiving rack 23 up and down to loosen the powder M so as not to condense it and remove it from the sieve. Supply into the rubber mold 13.

At this time, the powder feeding box 19 puts a fixed amount of the powder M into the powder feeding box 19 while scraping it off the upper surface of the rubber mold 13.
The powder M is agitated with the powder M, and the powder M is uniformly supplied by the brushing so as not to be biased to the end portion in the rubber mold 13, and the rubber mold 13 is not deformed. Can be supplied in a fixed amount. Then, as shown in FIG. 6, the powder M supplied into the rubber mold 13 is vibrated by the vibrator 29 via the bottom lid 15, and the packing density of the powder M is increased (unraveled). Approximately 1.5 times higher density than the state)

When the supply of the powder M into the rubber mold 13 is completed, the powder feeding box 19 is withdrawn from the rotary table 1 onto the slide table 5, and the rotary table 1 is rotated by 60 degrees. At the fourth station IV, as shown in FIG. 7, the upper lid 30 is loaded and set on the rubber mold 13, and the rotary table 1 is rotated by 60 degrees again. Fifth station V
Then, as shown in FIG. 2 and FIG. 8, the powder M in the rubber mold 13 is statically pressurized by the pressurizers 32 and 33 so that the packing density is 30 to 40%.
Up to.

When the pre-press molding of the powder M is completed in this way, the rotary table 1 is rotated by 60 degrees. In the sixth station VI, as shown in FIG. 9, the powder M, which has been subjected to the preliminary pressure molding, is extracted from the rotary table 1 together with the rubber mold 13 and is carried out from the rotary table 1 onto the work table 12. The first to sixth
In stations I to VI, the above-mentioned operations are independently and concurrently progressed in parallel, and the feeding cycle time becomes short,
The powder supply and pre-pressurization molding time can be greatly shortened, and productivity can be improved.

Further, in this embodiment, the powder M charged in the rubber mold 13 is vibrated by the vibrator 29 or the tapping machine to increase the packing density in the rubber mold 13, so that the hydraulic press Or, the amount of strain during cold isostatic pressing can be reduced, and near-net molding close to the dimensions of the product,
A good product can be obtained. In the above example,
Although a perforated plate is adopted as the receiving shelf 23, a wire mesh or the like can be adopted, and a comb-like brush or another agitator can be used instead of the rotating brush 26. Needless to say, it can be appropriately changed, and can also be adopted when the molding die is a mold.

[0021]

As described above, according to the present invention, the powder received in the powder feeding box by the quantitative feeder is dropped into the molding die by moving the powder feeding box laterally to the upper portion of the molding die. In the body feeding apparatus, a porous or mesh-shaped powder receiving rack is provided inside the powder feeding box, and a vibrating device for vibrating the powder receiving rack is provided.
In addition to ordinary powder, it is possible to quantitatively supply magnetic powder having high condensability, which has been difficult to quantitatively supply in the past.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an example of an apparatus for carrying out the present invention with some parts omitted.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 shows a detailed structure of a powder feeding box, (a) is a vertical side view, (b) is a plan view of (a), and (c) is a sectional view taken along line BB of (b). .

FIG. 4 is a sectional view of a first station.

FIG. 5 is a sectional view of a second station.

FIG. 6 is a sectional view of a third station.

FIG. 7 is a sectional view of a fourth station.

FIG. 8 is a sectional view of a fifth station.

FIG. 9 is a sectional view of a sixth station.

FIG. 10 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 13 Molding die 19 Powder feed box 21 Fixed quantity feeder 23 Receiving shelf 25 Exciter 26 Rotating brush 29 Exciter M Powder

Claims (1)

[Claims] 1. A powder feeding device for dropping and filling the powder, which is received in a powder feeding box by a quantitative feeder, into the molding die by laterally moving the powder feeding box and positioned in the upper portion of the molding die. A powder supply device for a molding die, characterized in that a porous or mesh-shaped powder receiving rack is provided inside, and a vibrating machine for vibrating the powder receiving rack is provided.