JP3351315B2 - Powder supply device, powder supply method, and green compact molding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for storing powder in a hopper, and guiding the powder supplied from the hopper to the cavity by squeezing the powder through a tapered wall of a shoe box which gradually reduces the opening area. Powder supply apparatus, a powder supply method, and a powder supply method capable of forming a green compact having a small variation in density, height, and accuracy by uniformly filling the inside of the cavity with the apparatus or the method. The present invention relates to a green compact forming apparatus for compression-molding powder by using upper and lower punches.

[0002]

2. Description of the Related Art In conventional powder metallurgy, a raw material powder containing a metal as a main component is supplied to a mold by a powder supply device, formed into a green compact by a powder molding device, and this green compact is sintered. Heating in a furnace and sintering were performed.

When the molding pressure is kept constant during molding, the density of the compact is stable, but the height of the compact varies depending on the amount of powder supplied. Further, when the bottom dead center of the punch of the molding apparatus is controlled to be constant, the height of the green compact is stabilized, but there is a problem that the density of the green compact varies.

Therefore, when the molding pressure is kept constant,
Post-processing is necessary to ensure the height accuracy of the green compact, and if the bottom dead center of the punch of the forming device is controlled to be constant, the density of the green compact varies There has been a problem that variations occur in the change and the quality is lowered.

In recent years, high precision has been actively pursued in order to eliminate post-processing, and the same applies to powder metallurgy. For this reason, a powder quantitative supply device is required for the purpose of achieving both the height accuracy of the green compact and the uniform green density.

A conventional first powder supply device (Japanese Patent Laid-Open No. 6-2)
In 10496), as shown in FIG. 22, the powder entered the shoe box B from the hopper HP through the hose HS and entered the cavity CT with the lowering of the lower punch DP.

A second conventional powder supply device (Japanese Patent Laid-Open No. 2-1)
In 08497), as shown in FIG. 23, the limiting member L is provided in the shoe box B in order to eliminate the continuum of the powder.

[0008]

In the above-mentioned conventional first powder supply device, the powder forms a continuous body from the hopper HP to the cavity CT, and the hopper H
The pressure applied to the powder in the cavity CT changes due to the influence of the amount of powder in P, the inner surface roughness of the hose HS, and the like. As a result, as shown in FIG. 22, the amount of powder entering the cavity CT changes, and there is a problem that the powder cannot be supplied quantitatively.

Further, focusing on the powder in the shoe box B, the characteristic of the powder is the angle of repose, and when the powder flows downward, it forms a mountain shape. For this reason, the powder forms a mountain shape in the shoe box B, and it is impossible to supply a constant amount of the powder at high and low peaks.

Further, in the above-mentioned second conventional powder supply apparatus, there is a problem that the powder on the cavity CT has a different height in the front-rear direction as shown in FIG. .

Next, the movement of the powder from the shoe box B to the cavity CT will be described with reference to FIG.
As shown in FIG. 24 (D), the powder starts to enter the cavity CT with the lowering of the lower punch DP, and the powder in the shoe box B begins to move from the middle due to friction with the wall surface as shown in FIG. 24 (C). The powder does not move and the powder remains locally, and thereafter, the powder starts to flow in an avalanche direction toward the center of the shoe box B at a stretch as shown in FIG. As a result, the pressure applied to the powder changes, and the cavity C
The amount of powder entering T changed, and it was not possible to supply a constant amount of powder.

Therefore, the present inventors store powder in a hopper and guide the powder supplied from the hopper to the cavity by squeezing the powder through a tapered wall of a rotating shoe box that gradually reduces the opening area. Focusing on the first technical idea of the present invention, focusing on the second technical idea of the present invention, in which the powder filled in the cavity is compression molded by upper and lower punches, and results of further research and development Thus, the present invention has been achieved which achieves the object of uniformly filling a powder into the cavity and enabling molding of a green compact with less variation in density, height and accuracy.

[0013]

According to a first aspect of the present invention, there is provided a powder supply device, comprising: a hopper for storing powder; and a powder supplied from the hopper, the opening area of which is gradually reduced. And a rotating shoe box guided by the tapered wall to the cavity.

According to a second aspect of the present invention, there is provided a powder supply device according to the first aspect, wherein the tapered wall is formed below an inner peripheral wall of the shoe box.

According to a third aspect of the present invention, there is provided a powder supply apparatus according to the second aspect, wherein the tapered wall is formed at a lower portion of a central outer peripheral wall of the shoe box. It is.

According to a fourth aspect of the present invention, in the powder supply apparatus of the third aspect, the powder supplied from the hopper is measured to supply a constant amount of powder to the shoe box. It is equipped with a weighing device for performing the measurement.

A powder supply device according to the present invention (fifth invention according to claim 5) includes a hopper for storing powder, and a powder supplied from the hopper being supplied to a lower portion of the inner peripheral wall and a lower portion of the central outer peripheral wall. Between the outer peripheral wall and the inner peripheral wall of the shoe box by the rotation drive of a shoe box which is squeezed and guided to the cavity by a tapered wall which gradually reduces the opening area formed in the shoe box and which is arranged in the shoe box. It is equipped with a stirring device for stirring the passing powder.

According to a sixth aspect of the present invention, in the powder supply apparatus of the fifth aspect, the powder supplied from the hopper is measured to supply a constant amount of powder to the shoe box. The stirring device includes a stirring member that is rotated by the rotation of the stirring motor between the outer peripheral wall and the inner peripheral wall of the shoe box.

According to a seventh aspect of the present invention, there is provided a powder supply apparatus according to the sixth aspect, further comprising a rotation drive mechanism for rotating the shoe box.

The powder supply apparatus according to the present invention (an eighth invention according to claim 8) is characterized in that a hopper for storing powder and a powder supplied from the hopper are supplied to a lower portion of the inner peripheral wall and a lower portion of the outer peripheral wall at the central portion. A shoe box that squeezes and guides the powder supplied from the hopper by a tapered wall that gradually reduces the opening area formed in the hopper, and a measuring device that supplies a constant amount of powder to the shoe box, A distribution device for distributing the powder weighed by the weighing device between the outer peripheral wall and the inner peripheral wall of the shoe box is provided.

According to a ninth aspect of the present invention, in the powder supply apparatus of the seventh aspect, the weighing device is moved from the position of the hopper to the position of the shoe box, and the weighing device is weighed. A moving mechanism for supplying powder into the shoe box is provided.

The present invention (the tenth aspect of the present invention)
Of the powder supply device, and squeezes the powder supplied from the hopper by a taper wall that gradually reduces an opening area formed at a lower portion of an inner peripheral wall and a lower portion of an outer peripheral wall at a central portion. A shoe box for guiding to the cavity and a measuring device for measuring the powder supplied from the hopper and supplying a certain amount of powder to the shoe box; The rotating partition member is interposed, and the powder measured by rotating the lower partition member is supplied to the shoe box arranged below.

[0023] The present invention (first first invention of claim 1 1)
Is a method of storing powder, weighing the stored powder, and squeezing the measured powder by a tapered wall that gradually reduces the opening area of a rotating shoe box and guiding the powder to a cavity. .

[0024] The present invention (first second invention according to claim 1 2)
According to the fifth aspect of the present invention, in the green compact forming apparatus, the cavity is formed in a die, and is formed of upper and lower punches for compression-molding the powder filled in the cavity.

[0025]

According to the first aspect of the present invention, there is provided a powder supply apparatus according to the first aspect, wherein the rotating shoe box gradually reduces the opening area of the powder supplied from the hopper storing the powder. Since the tapered wall moves relative to the passing powder in the circumferential direction since the tapered wall moves relative to the passing powder, the powder is uniformly filled in the cavity, and the density, height, This has the effect of enabling compacting with less variation in accuracy.

In the powder supply apparatus according to a second aspect of the present invention, in the first aspect, the taper wall formed on an inner peripheral wall at a lower portion of the shoe box is adapted to supply the powder supplied from the hopper with the powder. Since it is surely squeezed in the direction of the outer peripheral wall before the cavity and guided to the cavity, an effect of uniformly filling the cavity with the powder is obtained.

In the powder supply apparatus according to a third aspect of the present invention, in the second aspect, the taper wall formed on a lower outer peripheral wall of a center portion of the shoe box is provided with a powder supplied from the hopper. Is reliably squeezed in the direction of the outer peripheral wall and the inner peripheral wall in front of the cavity and guided into the cavity, so that the effect of uniformly filling the entire cavity with the powder is achieved.

According to a fourth aspect of the present invention, in the third aspect of the present invention, in the third aspect, the measuring device measures the powder supplied from the hopper and supplies a constant amount of the powder to the shoe box. Therefore, there is an effect that it is possible to form a green compact with small variations in density, height, and accuracy.

[0029] In the powder supply apparatus according to a fifth aspect of the present invention, in the fourth aspect, the agitating device is driven by a stirring motor provided in the shoe box to rotate the inner peripheral wall and the inner wall of the shoe box. Since the powder passing between the peripheral walls is agitated, it is possible to form a green compact with less variation in density, height and accuracy.

[0030] In the powder supply apparatus according to a sixth aspect of the present invention, in the fifth aspect, the agitating member constituting the agitating apparatus is configured such that the agitating motor rotates and drives the outer peripheral wall and the inner peripheral wall of the shoe box. Since the powder is rotated during the rotation, the powder passing therethrough is agitated in the circumferential direction, so that it is possible to form a green compact with less variation in density, height, and accuracy.

In the powder supply apparatus according to a seventh aspect of the present invention, the rotary drive mechanism rotates the shoe box according to the sixth aspect of the present invention. In addition, since the inner peripheral wall relatively moves in the circumferential direction, there is an effect that it is possible to form a green compact having less variation in density, height, and accuracy.

In the powder supply apparatus according to an eighth aspect of the present invention, since the distribution device distributes the powder weighed by the weighing device between the outer peripheral wall and the inner peripheral wall of the shoe box, the molding pressure is reduced. There is an effect that uniform molding according to the shape of the powder is enabled.

According to a ninth aspect of the present invention, the moving mechanism moves the weighing device from the position of the hopper to the position of the shoe box. Since the powder is supplied into the shoe box, the powder can be moved, and the powder can be measured and supplied at different positions, so that the powder can be supplied to an arbitrary position. Play.

[0034] In the powder supply apparatus according to a tenth aspect of the present invention, the partition member interposed above and below the weighing device disposed below the hopper rotates to measure the powder, and Since the powder measured by the rotation of the lower partition member is supplied into the shoe box disposed below, the powder can be measured and supplied at the same position, so that the apparatus is compact. This has the effect of being able to

The powder feeding method of the first first invention having the above described construction, the powder was stored and weighed stored powder, gradually reducing the opening area of the shoe box is rotating a metered powder Since the squeezing is performed by the tapered wall and guided to the cavity, it is possible to uniformly fill the cavity with the powder and to form a green compact with less variation in density, height, and accuracy.

The green compact molding apparatus of the first second invention having the above described construction, in the fifth invention, wherein by upper and lower punches, compression molding the powder filled in the cavity formed in the die Therefore, an effect of realizing compaction with less variation in density, height, and accuracy is achieved.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are described below.
This will be described with reference to the drawings.

(First Embodiment) As shown in FIGS. 1 to 5, a powder supply apparatus and a green compact molding apparatus according to a first embodiment include a hopper 1 for storing powder and a powder supplied from the hopper 1. And a shoe box 4 for guiding the powder into the cavity 7 by squeezing the powder through a tapered wall 5 that gradually reduces the opening area.

The weighing device 2 is disposed below the hopper 1 as shown in FIG.
Is formed, and is configured to measure a powder supplied from the hopper 1 and supply a certain amount of powder to the shoe box.

The moving mechanism 13 is provided with a fixed powder supply plate 20 in which the measuring hole 21 is filled with a certain amount of powder.
Is moved from the position of the hopper 1 (FIG. 1) to the position of the shoe box 4 shown in FIG. 2, and the measured powder is supplied into the shoe box 4.

As shown in FIG. 2, the distribution device 3 is disposed above the shoe box 4 and has an introduction hole 31 into which the powder weighed by the weighing device 2 is introduced. Branch into the shoe box 4
Distribution hole 3 that drops and distributes between the outer peripheral wall and the inner peripheral wall
2 comprises a distribution plate 30.

The moving mechanism 14 is located below the distribution hole 32 of the distribution plate 30 and has a predetermined amount of powder measured and distributed between the outer peripheral wall and the inner peripheral wall. Is moved to the position of the cavity 7 by a cylinder piston.

As shown in FIGS. 1 to 4, the tapered wall 5 has an inner peripheral wall of a tapered member 51 disposed below the inner peripheral wall of the shoe box 4 and a truncated cone at the lower center of the shoe box. A fixed amount of powder measured between the outer peripheral wall and the inner peripheral wall is formed by the outer peripheral wall of the tapered member 52, and a certain amount of powder is dropped and distributed.

As shown in FIG. 2, the stirring device 10 includes a stirring member 100 that rotates between the outer peripheral wall and the inner peripheral wall of the shoe box, and is provided between the outer peripheral wall and the inner peripheral wall of the shoe box 4. The distributed powder is agitated in the circumferential direction and then passed therethrough, and the lower cavity 7 is passed therethrough.
It is configured to be dropped.

The stirring member 100 is configured to be rotationally driven by a stirring motor 8 via bevel gears 91 and 92 connected to a stirring rod 101 integrally formed on the upper portion. After the powder interposed between the outer peripheral wall and the inner peripheral wall is stirred in the circumferential direction to make the height of the powder uniform in the circumferential direction, the shoe mechanism 4 is moved by the moving mechanism 14 to the shoe box 4. It is configured to move to the position of the cavity 7 and drop.

Core rod 12 formed in die 11
The upper and lower punches 6 and 15 are configured to move up and down in the cavity 7 in which the powder is inserted as shown in FIG. 5, and to compress and mold the powder filled in the cavity 7. Have been.

In the powder supply device and the green compacting device of the first embodiment having the above-described configuration, the powder stored in the hopper 1 is measured by the powder fixed supply plate 2 as shown in FIG. The fixed amount is supplied to the hole 21.

Thereafter, as shown in FIG. 2, the powder metering supply plate 2 is advanced by the cylinder 13, and the powder supplied to the metering holes 21 of the powder metering supply plate passes through the distribution plate 3. The powder is supplied into the shoe box 4 through the shoe box. At this time, the plate 3 and the shoe box 4 have a shape and a size close to the product shape in order to enable a constant supply.

The powder in the shoe box 4 is as follows:
The height is not uniform due to the angle of repose and friction with the wall. Therefore, the stirring motor 8 is operated, and the powder is stirred in the circumferential direction by rotating the stirring rod 10 via the bevel gears 91 and 92, so that the height of the powder in the shoe box 4 is made uniform. .

As shown in FIG. 3, the shoe box 4 in which the height of the powder is uniform is
4 advances to the top of the cavity 7 and then lowers the lower punch 6 located at the uppermost point at a certain speed as shown in FIG. I do.

At this time, since the taper members 51 and 52 are provided in the shoe box 4, the smooth flow of the powder downward in the inner circumferential direction and the outer circumferential direction is induced to increase the fluidity of the powder. It is possible to improve the quantity and smoothly move it into the cavity 7 to enable the fixed quantity supply.

[0052] Then, by pressurizing the powder in the cavity 7 by the lowering of the upper punch 15 P as shown in FIG. 5, as to formation density, little variation green compact height precision is there.

The effects of the powder supply apparatus and the compacting apparatus of the first embodiment having the above-described effects are as follows. In the first embodiment, since the product shape is intended to be a round product, by making the shoe box 4 round as shown in FIG. 6, it is possible to halve the variation in the powder supply amount in the square shape. .

Further, by stirring the powder in the shoe box 4 in the circumferential direction by the stirring member 10, the weight variation of the powder supply amount can be reduced to half as shown in FIG.

Further, the taper members 51 and 52 are provided in the shoe box 4, and the relationship between the flow speed of the powder in the shoe box 4 and the lowering speed of the lower punch 6 is made to be a certain condition, whereby FIG. As shown in (1), it is possible to reduce the variation in the powder supply amount.

Further, the shoe box 4 from the hopper 1
When the powder is supplied to the plate, the powder is supplied through the plate 2 and the plate 3 so that the powder does not become a continuous body as in the case of continuously supplying the powder using a conventional hose. As shown, the variation in the powder supply amount can be reduced.

(Second Embodiment) The powder supply device and the green compact forming device of the second embodiment include a rotation drive mechanism 18 for rotating the shoe box 4 as shown in FIGS. In addition, the difference is that a blade member 15 is formed on a tapered wall formed on the inner peripheral wall of the shoe box 4, and the difference will be mainly described.

The rotation drive mechanism 18 includes a drive motor 18
0 and the gear 1 integrally formed with the drive motor 180
7 and a gear 16 integrally formed on the outer peripheral wall of the shoe box 4 so as to rotate the shoe box 4.

In order to prevent the powder from becoming a continuous body to the shoe box 4, the powder is stored in the hopper 1 by a constant amount every time the powder stored in the hopper 1 is formed by a structure via the plate 2 and the plate 3. From the shoe box 4.

The shape of the shoe box 4 is set to a size and a shape close to the product shape in order to eliminate a local residue of the powder when the powder is supplied to the cavity 7.

The powder supplied into the shoe box 4 is stirred in the circumferential direction by the stirring member 100 rotating via the bevel gears 91 and 92 by the motor 8 so that the powder is always kept at a uniform height. To be.

The powder having a uniform height in the shoe box 4 moves above the cavity 7 by moving the shoe box 4 back and forth, and enters the cavity 7 as the lower punch 6 descends. At this time, the taper members 51 and 52 are provided in the shoe box 4 so as to induce the downward flow of the powder so that the powder moves smoothly into the cavity 7 and the local bias of the powder is eliminated. .

The powder having a uniform height in the shoe box 4 is moved over the cavity 7 by the forward and backward movement of the shoe box 4, and simultaneously with the lowering of the lower punch 6, the driving motor 180 is driven. Activate gears 16, 1
7, the shoe box 4, which is integrated,
The taper members 51 and 52 and the blade 15 are rotated. At this time, the rotation direction is the die 11 corresponding to the workpiece.
Is the same as the twist direction.

The powder supply device and the green compact forming device of the second embodiment having the above-described effects promote the movement of the powder in the shoe box 4 in the rotation direction by the rotation of the shoe box 4 so that the powder moves smoothly. Since the powder moves to the cavity 7 and the powder is smoothly moved into the cavity 7, there is an effect that local bias of the powder can be eliminated.

(Third Embodiment) The powder supply device and the green compact forming device of the third embodiment are integrated with a tapered wall formed on the inner peripheral wall of the shoe box 4 as shown in FIG. The difference is that the blade member 15 formed by the above is constituted by a pyramid-shaped projection twisted at a constant angle θ. The difference will be mainly described.

In the powder supply device and the green compact forming device of the third embodiment, the powder stored in the hopper 1 is supplied quantitatively to the hole 2a of the powder quantitative supply plate 2.

Thereafter, the powder fixed quantity supply plate 2 is advanced by the cylinder 13, and the powder supplied to the hole 2 a of the powder fixed quantity supply plate enters the shoe box 4 via the plate 3. At this time, the plate 3 and the shoe box 4 have a shape and a size close to the product shape in order to enable a constant supply.

The powder in the shoe box 4 is as follows:
The height is not uniform due to the angle of repose and friction with the wall. Then, the stirring motor 8 is operated, and the bevel gears 91 and 9 are operated.
The powder is stirred by turning the stirring rod 10 through 2 to make the height of the powder in the shoe box 4 uniform.

The shoe box 4 having a uniform powder height goes over the cavity 7 by advancing the cylinder 14, and then rotates the lower punch 6 at a certain speed and descends at a certain speed. At the same time, the drive motor 18 is operated, and the shoe box 2, the tapered members 51, 5
2. The blade 15 is rotated.

At this time, the direction of rotation of the shoe box 2 is the same as the direction of twist of the die 11. At this time, the taper members 51 and 52 provided in the shoe box 4 induce the powder to flow downward to improve the fluidity of the powder, and the rotation of the shoe box 4 causes the shoe box 4 to rotate. By promoting the movement of the powder in the rotation direction and smoothly moving the powder to the cavity 7, it is possible to supply a fixed amount of powder to the die 11 having a twisted shape.

[0071] Then, by pressurizing the powder in the cavity by lowering the upper punch 15 P, density, compact is molded shown less in 13 variations of height accuracy.

The powder supply device and the green compacting device of the third embodiment having the above-described functions have the following effects by providing the structure and function of the above-described powder supply device.

By optimizing the ratio between the number of rotations of the lower punch 6 at the time of lowering and the number of rotations of the shoe box 4, as shown in FIG.
Can be.

As a result, the variation in the density in the circumferential direction of the formed green compact can be reduced to about 0.05 g / cc or less as shown in FIGS.

The relationship between the torsion angle θ of the pyramidal projection as the blade member 15 and the weight variation is shown in FIG.
As shown in (2), the larger the angle θ, the smaller the weight variation.

The above-described embodiments have been described by way of example only, and the present invention is not limited to these embodiments. Those skilled in the art will recognize from the claims, the detailed description of the invention, and the drawings. Modifications and additions are possible without departing from the technical idea of the present invention.

In the above-described embodiment, an example has been described in which the weighed powder is moved to different positions by a moving mechanism that reciprocates linearly. However, the present invention is not limited to these. 18 and FIG.
As shown in FIG. 9, the partitioning members 19 and 20 that rotate up and down on a weighing plate disposed at the lower part of the hopper are interposed, and the powder weighed by rotating the lower partitioning member 20 is supplied to the circular hole 201. A configuration can be adopted in which supply is made to the inside of the shoe box 4 disposed below via the.

In the above-described embodiment, an example in which the blade member 15 is integrally formed on the tapered wall formed on the inner peripheral wall of the shoe box 4 has been described as an example.
The present invention is not limited to these, and FIG.
The blade member 15 is integrally formed on a tapered wall formed on the outer peripheral wall formed coaxially with the center of the shoe box 4 as shown in FIG. A mode in which the blade member 15 is integrally formed on the inner and outer walls of the member can be adopted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a weighing operation state in a powder supply device and a green compact molding device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a moving operation state to a shoe box in the first embodiment.

FIG. 3 is a cross-sectional view showing a moving operation state to a cavity in the first embodiment device.

FIG. 4 is a sectional view showing a lowering operation state of a lower punch in the apparatus of the first embodiment.

FIG. 5 is a cross-sectional view illustrating a lowering operation state of an upper punch in the apparatus according to the first embodiment.

FIG. 6 is a diagram showing a relationship between a shape of a shoe box as a feeder and a variation in weight in the first embodiment apparatus.

FIG. 7 is a diagram showing the relationship between the presence or absence of agitation of the powder in the shoe box and the variation in the weight of the green compact in the apparatus of the first embodiment.

FIG. 8 is a diagram showing a relationship between a punch descending speed and a variation in weight of a green compact in the first embodiment apparatus.

FIG. 9 is a diagram showing a relationship between intermittent supply (with a hose) at a constant amount, continuous supply of powder with a conventional hose (with a hose), and variation in the weight of a compact in the first embodiment apparatus. is there.

FIG. 10 is a cross-sectional view illustrating a stirring operation state in a shoe box in a powder supply device and a green compact forming device according to a second embodiment of the present invention.

FIG. 11 is an enlarged sectional view showing the periphery of a shoe box in the device according to the second embodiment.

FIG. 12 is a partial perspective view showing a pyramid-shaped blade member formed on a tapered wall in a powder supply device and a green compact molding device according to a third embodiment of the present invention.

FIG. 13 is a perspective view showing an example of a green compact formed by the green compact forming apparatus of the third embodiment.

FIG. 14 is a diagram showing a relationship between a ratio of a rotation speed of a lower punch to a rotation speed of a shoe box as a feeder and a green compact weight in the third embodiment.

FIG. 15 is a diagram showing a relationship between each of the eight divided parts of the green compact molded according to the third embodiment and the density.

FIG. 16 is a diagram showing the relationship between the density of each of the eight divided portions of the boss portion and the gear portion of the green compact molded according to the third embodiment.

FIG. 17 is a diagram showing the relationship between the twist angle of the blade member and the weight variation of the green compact in the third embodiment.

FIG. 18 is a partial cross-sectional view showing another mode of weighing by inserting a vertically rotating partition member of the weighing plate of the present invention.

FIG. 19 is a plan view showing a positional relationship between a circular hole of a partition member and a shoe box in this embodiment.

FIG. 20 is a partial cross-sectional view showing another mode in which a blade member 15 is integrally formed on a tapered wall formed on the outer peripheral wall formed coaxially at the center of the shoe box 4 of the present invention.

FIG. 21 is a partial sectional view showing another embodiment in which the blade member 15 is integrally formed on the inner and outer walls of the stirring member of the present invention.

FIG. 22 is a sectional view showing a conventional first powder supply device.

FIG. 23 is a sectional view showing a second conventional powder supply device.

FIG. 24 is a cross-sectional view illustrating a conventional process of moving powder from inside a shoe box to a cavity.

[Explanation of symbols]

 Reference Signs List 1 hopper 5 tapered wall 4 shoe box 7 cavity

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-10-193360 (JP, A) JP-A 61-36396 (JP, U) JP-A 1-92237 (JP, U) JP-A 61-36 183920 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B30B 11/00 B22F 3/035

Claims (12)

(57) [Claims] 1. A hopper for storing powder, and a rotating shoe box for guiding powder supplied from the hopper to a cavity by squeezing the powder by a tapered wall that gradually reduces an opening area. Powder supply equipment. 2. The powder supply device according to claim 1, wherein the tapered wall is formed below an inner peripheral wall of the shoe box. 3. The powder supply device according to claim 2, wherein the tapered wall is formed at a lower portion of an outer peripheral wall at a center of the shoe box. 4. The powder supply device according to claim 3, further comprising a measurement device that measures the powder supplied from the hopper and supplies a fixed amount of powder to the shoe box. 5. A cavity in which a powder is supplied from the hopper, and the powder supplied from the hopper is squeezed by a tapered wall which gradually reduces an opening area formed in a lower portion of an inner peripheral wall and a lower portion of an outer peripheral wall at a central portion. And a stirrer that stirs the powder passing between the outer peripheral wall and the inner peripheral wall of the shoe box by the rotational drive of a stirring motor disposed in the shoe box. Powder feeder. 6. The shoe box according to claim 5, further comprising: a measuring device for measuring a powder supplied from the hopper and supplying a fixed amount of powder to the shoe box, wherein the stirring device is provided on the outer peripheral wall of the shoe box. And a stirring member that is rotated between the inner peripheral wall and the inner peripheral wall by the rotation of the stirring motor. 7. The powder supply device according to claim 6, further comprising a rotation drive mechanism for rotating the shoe box. 8. A hopper for storing the powder, and the powder supplied from the hopper is squeezed by a taper wall which gradually reduces an opening area formed at a lower portion of an inner peripheral wall and a lower portion of a central outer peripheral wall. A weighing device that measures the powder supplied from the shoe box and the hopper to guide the powder to the shoe box, and supplies the powder measured by the weighing device to the outer peripheral wall of the shoe box and A powder supply device comprising a distribution device for distributing between inner peripheral walls. 9. The method according to claim 7, further comprising a moving mechanism for moving the weighing device from the position of the hopper to the position of the shoe box, and supplying the weighed powder into the shoe box. And a powder supply device. 10. A hopper for storing powder, and a powder supplied from the hopper is squeezed by a tapered wall formed in a lower portion of an inner peripheral wall and a lower portion of an outer peripheral wall at a central portion to gradually reduce a cavity. A shoe box that guides the hopper and a weighing device that weighs the powder supplied from the hopper and supplies a fixed amount of powder to the shoe box, above and below the weighing device disposed below the hopper. A powder characterized in that a rotating partition member is interposed and powder measured by rotating a lower partition member is supplied into the shoe box disposed below. Feeding device. 11. A method for storing powder, weighing the stored powder, and guiding the measured powder to a cavity by squeezing the tapered wall to gradually reduce an opening area of a rotating shoe box. Powder feeding method. 12. The green compact forming apparatus according to claim 5, wherein the cavity is formed in a die, and comprises upper and lower punches for compression-molding the powder filled in the cavity.