JP2000052097A - Powder feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve charging efficiency of powder and even the charging density in a powder feeder which drops and charge the powder in a feeder box into a cavity by forwarding the feeder box on the cavity. SOLUTION: When an air vent 20 is formed at the bottom part of a feeder box 10 and the feeder box 10 moves forward on a cavity 3 for fluidizing a powder P in the cavity 3, the air is mixed with the powder P from the air vent 20 resulting in the rough density. Additionally, the air flown up from the cavity 3 is discharged from the air vent 20 to the outside of the feeder box 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder feeder for filling a powder in a cavity of a die when compacting a raw material powder in obtaining a sintered body by a powder metallurgy method.

[0002]

2. Description of the Related Art FIG. 14 shows an example of a conventional powder feeder. In the figure, reference numeral 1 denotes a die, into which a lower punch 2 is inserted from below, and a cavity 3 is formed in the die 1 by the lower punch 2 and the die 1. The die 1 is placed on a horizontal die table 1A with the opening of the cavity 3 facing upward. A feeder box 10 having a rectangular parallelepiped shape and no bottom is placed on the die table 1A. A rod (drive means) 11 driven by a drive source (not shown) is connected to the feeder box 10.
The feeder box 10 is configured such that the lower end edge thereof slides on the die table 1A from the standby position shown in FIG. When the feeder box 10 advances to above the cavity 3, its opening is designed to sufficiently cover the opening of the cavity 3. In the feeder box 10, a hose 1 is provided from a hopper 12 provided above.
The powder P is supplied and stored at any time after passing through 3. The hose 13 is flexible so that it can follow the movement of the feeder box 10.

According to this powder feeder, the feeder box 10 at the standby position is advanced by the rod 11 onto the cavity 3 of the die 1. Then, the powder P in the feeder box 10 falls into the cavity 3 and is filled. After that, the feeder box 10 is
To the standby position. When the feeder box 10 passes over the die 1 during this retreating operation, the powder P is frayed off by the lower edge of the feeder box 10 and the upper surface of the powder P in the cavity 3 is formed by the die 1 and the die table 1A. Adjusted to be flush with the top. The above is one cycle of filling the powder into the cavity 3. Such a filling method employs a general dropping method in which powder P is freely dropped into a cavity 3 formed in advance, and in this case, a feeder box 10 is
In many cases, a means for vibrating the powder P back and forth to promote the fall of the powder P is adopted.

FIGS. 15A to 15D schematically show a powder filling mechanism by a dropping method. In this case, the feeder box 10 is opened upward, and a plurality of cycles of powder P are supplied from the upper opening into the feeder box 10 and stored therein. FIG.
(A) shows a state in which the powder P is stored in the feeder box 10 at the standby position. As shown in FIG. 15 (b), when the feeder box 10 advances and stops on the cavity 3, the powder P falls into the cavity 3 while mixing with the air in the cavity 3, and the air in the cavity 3 Feeder box 10 suitable for air volume
Is replaced. When this state is left for a while, or when the feeder box 10 is vibrated, the air in the feeder box 10 floats and the powder P in the feeder box 10 and the cavity 3 as shown in FIG. The amount of air P contained in the cavity 3 is determined by balancing the amount of air contained. Then
As shown in FIG. 15D, as the feeder box 10 is retracted, the powder P is worn away, and the filling is completed.
In addition, as shown in FIG. 14, when the upper part of the feeder box 10 is not open and the inside is almost closed, and the supply of the powder P into the feeder box 10 is performed from the hopper 12 through the hose 13. The powder P is supplied from the hopper 13 into the feeder box 10 by the amount filled in the cavity 3, and the air in the cavity 3 flows upward through the hose 13 from inside the feeder box 10.

On the other hand, when the cavity 3 is so narrow or deep that the powder P cannot be sufficiently filled by the dropping method, the lower punch 2 is raised, and the feeder box 10 is moved thereon. A suction method of filling the powder P in the feeder box 10 into the cavity 3 while forming the cavity 3 by lowering the lower punch 2 to a predetermined filling depth from the state is adopted. In any method, the filling amount of the powder P is indirectly determined by the volume of the cavity 3, so that the apparent density and the fluidity of the powder P are
This is an important factor for obtaining a uniform packing density.

[0006]

According to the powder feeder described above, in the dropping method, the air in the cavity 3 is expelled as the powder P is filled in the cavity 3, so that the powder P and the air are removed. However, air was trapped in the cavity 3 and the packing density was sometimes non-uniform. Also, if the speed of the feeder box 10 is increased to increase the molding efficiency, the cavity 3 is
, The powder P was not immediately replaced with air, so that the time required for the filling was extended and the filling density was nonuniform. These problems can be solved to a certain extent by opening air holes in the upper wall of the feeder box 10 or providing a branch pipe in the middle of the hose 13 to assist the exhaust from the cavity 3. Came. However, in the case of powders which are inferior in flowability and tend to cause bridging, such a solution is insufficient, and the filling time (time during which the feeder box 10 is stopped on the die 1) is increased, or the feeder box 10 For this reason, it is necessary to take measures such as increasing the number of vibrations of the resin, resulting in a reduction in molding efficiency. Such a problem also occurs in the suction method.

Therefore, the present invention improves the filling efficiency of the powder in the cavity and improves the packing density even if the powder has poor fluidity or the moving speed of the feeder box is high. It is an object of the present invention to provide a powder feeder capable of achieving a sufficiently uniform and capable of obtaining a green compact without defects.

[0008]

According to the present invention, there is provided a powder feeder comprising: a die having a cavity; a die table in which the die is installed with an opening of the cavity facing upward; and a powder stored therein. On the die table,
A bottomless feeder box provided so that the lower edge of the die slides with respect to the cavity of the die from the standby position while sliding, and driving means for the feeder box,
The feeder box in the standby position is advanced to above the cavity of the die by the driving means so that the powder in the feeder box flows and fills the cavity, and thereafter the feeder box is retracted to the standby position by the driving means. The formed powder feeder is characterized in that a wall portion of the feeder box with which the powder comes into contact is formed with an air hole penetrating in and out.

According to this configuration, when the powder in the feeder box starts flowing into the cavity, external air flows into the feeder box from the ventilation hole, and the inflow air is contained in the powder, so that the powder is removed. Density is coarse and if bridging occurs it will be destroyed,
The fluidity of the powder is improved. As a result, the powder flows smoothly into the cavity. As the powder flows into the cavity, the air in the cavity rises to replace the powder and air, and during this replacement, the air content in the flowing powder And the fluidity is further improved. As the replacement of powder and air progresses, the powder filled in the cavity gradually densifies with the powder being filled one after another, and when the amount of air contained in the powder in the feeder box and the cavity is balanced. Thus, the apparent density of the powder in the cavity is stabilized, and the filling amount is determined. During this filling process, excess air floating above the cavity and at the lower portion in the feeder box is discharged to the outside of the feeder box from the ventilation hole. Therefore, the flow stagnation of the powder due to excess air is suppressed, and the filling time is shortened and the filling density is made uniform. In addition, since the powder filled in the cavity falls in order from the bottom existing in the feeder box, the vent hole is preferably formed at the bottom of the feeder box or at a position as close as possible to the bottom.

In the present invention, the following configurations are preferred. First, it is preferable that the ventilation hole formed in the feeder box is inclined upward toward the outside of the feeder box because leakage of the powder to the outside of the feeder box is suppressed as much as possible. Further, as described above, it is preferable that the ventilation hole is formed at the bottom of the feeder box, and as a specific configuration, a groove is formed at a lower end edge of the feeder box which is a sliding portion to the die table. Vent holes are formed in the shape. As a result, the vent hole is formed at the bottom of the feeder box, and the smooth filling of the powder by the inflow and outflow of air is more effectively achieved. Further, by providing an outer ventilation pipe extending upward from the ventilation hole to the outside of the feeder box, leakage of the powder from the ventilation hole can be effectively prevented.

As described above, the vent hole serves as a window for inflow of air into the feeder box or outflow of air from the inside of the feeder box. If the window is located immediately above the cavity. The flow of the outside air into the powder flowing into the cavity and the discharge of the air floating in the feeder box from inside the cavity progress more smoothly. As a mode for realizing such an effect, it is preferable to provide an inner ventilation pipe extending from the ventilation hole into the feeder box. According to this aspect, the tip opening of the inner ventilation pipe is located immediately above the cavity, and the tip opening serves as a window for inflow and outflow of air. Further, since the inner ventilation pipe is disposed so as to traverse the powder in the feeder box, some of the powder flowing into the cavity collides with the inner ventilation pipe and is once received. When the powder passes through the inner ventilation pipe, the density becomes coarse due to the vacancy below the inner ventilation pipe, the powder contains more air, and the fluidity is further improved. In addition, there is an advantage that the bridging is easily broken by the powder colliding with the inner ventilation pipe.

In the present invention, as means for preventing the leakage of powder, in addition to inclining the vent hole and providing the outer vent pipe in the vent hole as described above, the feeder box covers the vent hole from outside, and Means for providing a cover that slides integrally with the feeder box on the die table can be employed. According to this means, even if the powder leaks from the ventilation hole, the powder is blocked by the cover and can be recovered without leaking out of the cover. Therefore, the amount of powder used does not increase, and the powder is prevented from being contaminated on the die table.

Further, in the present invention, it is possible to adopt a configuration in which the inside of the feeder box has an upward opening, and a cover is provided on the feeder box to cover the opening from the outside. According to this configuration, when the powder is filled into the cavity and the entire powder in the feeder box descends, the upper space in the feeder box is opened from the opening to outside air as compared with the case where there is no upward opening. Does not become a negative pressure due to the inflow, so that the entire powder can be smoothly lowered and the efficiency of filling the powder into the cavity is improved. Further, even if there is powder scattered outside the feeder box from the opening, the powder stays in the cover, thereby preventing the surroundings from being contaminated.

Further, the present invention has the following configuration as another main feature. That is, a die having a cavity, a die table in which the die is installed with the opening of the cavity facing upward, and powder stored inside the die table. The feeder box includes a bottomless feeder box provided so that the lower end edge thereof slides forward and backward, and driving means for the feeder box. The feeder box at the standby position is advanced to a position above the die cavity by the driving means. Thus, the powder in the feeder box is caused to flow into the cavity to be filled therein, and thereafter, in the powder feeder configured to retreat the feeder box to the standby position by the driving means, one end opening of the feeder box is provided in the feeder box. Buried in the powder stored in the Internal vent pipe is provided which extends up to the upper space in the box.

According to this configuration, when the replacement of the powder in the cavity with the air in the cavity progresses, and the air floats at the lower part in the feeder box, the air flows into the internal ventilation pipe from one end opening of the internal ventilation pipe, It is discharged to the upper space in the feeder box from the other end opening. For this reason, the stagnation of the powder flowing into the cavity due to the air floating from inside the cavity is suppressed, the flowability of the powder is improved, and the filling time is shortened. The internal ventilation pipe may have a configuration in which the other end opening side penetrates the feeder box and the other end opening faces the outside of the feeder box, and discharges air to the outside of the feeder box. . In any case, it is preferable that the one end opening of the internal ventilation pipe is disposed at the bottom of the feeder box or at a position as close as possible to the bottom.

[0016] The powder flowing in contact with or near the internal ventilation pipe passes around the internal ventilation pipe, and the density becomes coarse due to the vacancy below the internal ventilation pipe, thereby increasing the amount of air. Includes and improves liquidity. In addition, there is an advantage that the bridging is easily broken by the powder colliding with the internal ventilation pipe. Here, at one end of the internal ventilation pipe buried in the powder, a groove-shaped opening is directed downward, and a gutter-shaped ventilation expansion member communicating with the internal ventilation pipe is provided in a state where a gap is provided between the internal ventilation pipe and the die table. Is preferred. According to this, the rate at which the density of the powder becomes coarse by passing through the ventilation expansion member increases. Further, the air that has floated from the cavity into the feeder box flows into the internal ventilation pipe from the opening of the ventilation expansion member, and the air is discharged more smoothly. Due to these effects, the powder filling efficiency is further improved.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings to be referred to, the same components as those in FIG. 14 are denoted by the same reference numerals, and description thereof will be omitted. (1) First Embodiment FIGS. 1 and 2 show a powder feeder according to a first embodiment of the present invention. In the first embodiment, the front wall 10a of the feeder box 10 and the left and right (up and down in FIG. 2)
A plurality of ventilation holes 20 are formed below the side wall 10b. These ventilation holes 20 are circular with the same diameter, and are arranged at equal intervals in the horizontal direction on the front wall portion 10a and the side wall portion 10b. The portion in which the vent hole 20 is formed is originally the powder P stored in the feeder box 10.
Is lower enough to always contact its inner surface. Also,
Outside the feeder box 10, the ventilation hole 20 is covered from the outside, and the feeder box 1 is placed on the die table 1A.
A cover 30 that slides integrally with the cover 0 is attached via a connecting piece 31. There is a gap between the cover 30 and the front wall 10a and the side wall 10b of the feeder box 10, and the height of the cover 30 is
The height of the feeder box 10 is sufficiently higher than the portion where the zero is formed, and is at least half the height of the feeder box 10.

According to the first embodiment, when the feeder box 10 advances to the cavity 3 and the powder P in the feeder box 10 fills the cavity 3, the powder P flows into the cavity 3 ( When the air begins to fall, external air flows into the feeder box 10 from each of the air holes 20, and the inflow air is contained in the powder P, so that the density of the powder P becomes coarse and bridging occurs. If it has, it is broken and the fluidity of the powder P is improved. As a result, the powder P flows into the cavity 3 smoothly. As the powder flows into the cavity 3,
The air in the cavity 3 floats to replace the powder P with the air. During this replacement, the air content in the flowing powder P increases, and the fluidity further improves. . As the displacement of powder P and air progresses, cavity 3
The powder P filled in the inside is the powder P
When the amount of air contained in the powder P in the feeder box 10 and the cavity 3 is balanced, the apparent density of the powder P in the cavity 3 is stabilized and the filling amount is determined. During this filling process, the feeder box 10 above the cavity 3
Excess air that has floated to the lower portion of the inside is discharged from at least one ventilation hole 20 to the outside of the feeder box 10.
Therefore, the flow stagnation of the powder P due to excess air is suppressed, and the filling time is shortened and the filling density is made uniform. In addition, since the powder P flows into the cavity 3 in order from the bottom in the feeder box 10, the above-described operation smoothly proceeds by forming the ventilation holes 20 in the lower portion of the feeder box 10. I do.

Further, in the present embodiment, the powder P in the feeder box 10 is
Although there is a high possibility that the powder P leaks out, the leaked powder P is blocked by the cover 30 to prevent the powder P from leaking out of the cover 30, and the powder P accumulated between the cover 30 and the feeder box 10. P can be recovered.
Therefore, the amount of powder P used does not increase, and the powder P does not contaminate the die table 1A. The powder P accumulated between the front wall 10a and the cover 30 is filled into the cavity 3 at the next filling with the movement of the feeder box 10.

FIGS. 3 and 4 show a modification for suppressing leakage of the powder P. FIG. Feeder box 1 in FIG.
The outer ventilation pipe 21 extends upward from the ventilation hole 20 to the outside of the feeder box 10 and has an upper end opening located below the upper end surface of the feeder box 10. Further, the ventilation hole 20 in FIG.
Inclined upward toward the outside of the vehicle. In any case, the configuration is such that leakage of the powder P to the outside of the feeder box 10 is suppressed as much as possible.

(2) Second Embodiment FIG. 5 shows a second embodiment of the present invention. In this case, an inner ventilation pipe 22 extending into the feeder box 10 from each ventilation hole 20 formed in the feeder box 10 of the first embodiment is provided. These inner ventilation pipes 2
The two tip openings are located just above the cavity, and the tip openings serve as windows for inflow of air into the feeder box 10 or outflow of air from the feeder box 10. With the air outlet window located just above the cavity,
The inflow of the outside air into the powder P flowing into the cavity and the discharge of the air floating in the feeder box 10 from the cavity are more directly performed, and the filling operation of the powder P proceeds more smoothly. Further, since the inner ventilation pipe 22 is disposed so as to cross the inside of the powder P in the feeder box 10, a part of the powder P flowing into the cavity collides with the inner ventilation pipe 22 and is once received. There is. When the powder P passes through the inner ventilation pipe 22, the density becomes coarse due to the vacancy below the inner ventilation pipe 22, and the powder P contains a lot of air.
When the powder P collides with the powder P, bridging is easily broken, so that the fluidity of the powder P is improved, and the filling efficiency of the powder P is also improved.

(3) Third Embodiment FIG. 6 shows a third embodiment of the present invention. In the present embodiment, the front wall portion 10a and the side wall portion 1 of the feeder box 10 are replaced with the ventilation holes 20 of the first embodiment.
0b and a lower end edge of the rear wall portion 10c, a groove-shaped vent hole 20 is formed.
a is formed. In this case, feeder box 10
Since the ventilation holes 20a are also formed in the rear wall portion 10c, the cover 30 for preventing the leakage of the powder P is attached to the rear wall portion 10c.
It is provided to extend to the side.

As described above, the powder P in the feeder box 10 flows into the cavity from the bottom in the feeder box 10 in the order described above. Preferably, it is formed at a position as close as possible to the bottom. Therefore, in this embodiment, since the ventilation hole 20a is formed at the bottom of the feeder box 10,
The smooth filling of the powder P by the inflow and outflow of air is more effectively achieved.

(4) Fourth Embodiment FIG. 7 shows a fourth embodiment of the present invention. In the present embodiment, the same feeder box 1 as in the first embodiment is used.
In front of the upper plate portion 10d (left side in FIG. 7), the upper space in the feeder box 10 and the feeder box 10
An opening 40 communicating with the outside is formed. Outside the feeder box 10, a cover 32 that covers the entire front wall 10 a and the left and right side walls 10 b is provided with a connecting piece 3.
Attached via 1. There is a gap between the cover 32 and the feeder box 10, and the vent hole 20 and the opening 40 are covered by the cover 32.

According to the present embodiment, the air discharged from the vent hole 20 with the filling of the powder P into the cavity is
The gap between the cover 32 and the feeder box 10 is raised and the upper space 1 in the feeder box 10 is opened from the opening 40.
Flow into OA. For this reason, the upper space 10A does not become a negative pressure, so that the lowering of the entire powder P proceeds smoothly, and the filling efficiency of the powder P into the cavity is improved. Further, even if the powder P scatters outside the feeder box 10 from the opening 40, the powder P stays in the cover 32, and the contamination to the surroundings is prevented.

FIG. 8 shows a modification of the fourth embodiment. In this modified example, a connection to the hose 13 is formed by the cover 32 and the feeder box 10.
Further, the feeder box 10 does not have the upper plate portion 10d, and the opening 40 upward is enlarged, and the powder P flowing from the hose 13 flows into the feeder box 10 through the opening 40 and is stored. Also in the case of this modified example, when the powder P is filled into the cavity, the air discharged from the ventilation hole 20 flows into the upper space 10A in the feeder box 10, and the flow action of the air occurs. I do.

(5) Fifth Embodiment FIG. 9 shows a fifth embodiment of the present invention. In the present embodiment, the ventilation holes are not formed. Instead, a plurality of cylindrical internal ventilation pipes 50 are provided in the feeder box 10 with their axial directions directed vertically. These internal ventilation pipes 50 are connected to the feeder box 10.
Are arranged in the center in the width direction at equal intervals in the front-rear direction, and attached in a state of being suspended from the upper plate portion 10 d via the connecting piece 51. The lower end openings of the internal ventilation pipes 50 are located at the lower part in the feeder box 10 and are buried in the powder P. The upper end opening is located in the upper space 10 </ b> A in the feeder box 10.

According to the present embodiment, when the powder P is filled into the cavity and the air in the cavity is replaced with the powder P, and the air floats on the lower portion in the feeder box 10, the air is removed from the inside. It flows into the internal ventilation pipe 50 from the lower end opening of the ventilation pipe 50, and is discharged from the upper end opening to the upper space 10 </ b> A in the feeder box 10. Therefore, the stagnation of the powder P flowing into the cavity due to the air floating from the inside of the cavity is suppressed, the flowability of the powder P is improved, and the filling time is shortened. Since the powder P flows into the cavity in order from the bottom existing in the feeder box 10, the lower end opening of the internal ventilation pipe 50 is disposed at the bottom of the feeder box 10 or at a position as close as possible to the bottom. Is preferred. Further, the powder P flowing in contact with or close to the internal ventilation pipe 50 is used.
When passing around the internal ventilation pipe 50, the internal ventilation pipe 5
Since the space below 0 is vacant, the density becomes coarse and contains a lot of air, and the fluidity is further improved. Furthermore, when the powder P collides with the internal ventilation pipe 50, bridging is easily broken.

(6) Sixth Embodiment FIG. 10 shows a sixth embodiment of the present invention. In the present embodiment, a gutter-like member (ventilation expansion member) 60 having an L-shaped cross section extending left and right (in the front and back directions in FIG. 10) is provided at the lower end of the internal ventilation pipe 50 of the fifth embodiment. It is mounted with the opening facing downward and with a gap between it and the die table 1A. The internal ventilation pipe 50 penetrates the gutter-like member 60, so that the groove-shaped opening of the gutter-like member 60 communicates with the inside of the internal ventilation pipe 50. When the gutter-like member 60 is attached to the lower end of the internal ventilation pipe 50 in this manner,
When the powder P is filled into the cavity, the gutter-shaped member 6
By passing through zero, the rate at which the density of the powder P in the feeder box 10 becomes coarser further increases, and the rate at which the powder P collides with the gutter-like member 60 to break bridging increases. Further, the air that has floated in the feeder box 10 from inside the cavity flows into the internal ventilation pipe 50 through the groove-shaped opening of the gutter-shaped member 60, and the discharge of the air proceeds more smoothly. By these actions, the filling efficiency of the powder P is further improved.

FIGS. 11A and 11B show another embodiment of the gutter-like member 60 and the internal ventilation pipe 50. FIG. The gutter-shaped member 60 shown in (a) has a semicircular cross section. 10B, the internal ventilation pipe 50 is a square tube having a square cross section, and the gutter member 60 has an L-shaped cross section shown in FIG.

(7) Seventh Embodiment FIG. 12 shows a seventh embodiment of the present invention. In the present embodiment, instead of the internal ventilation pipe 50 of the fifth embodiment, the upper end portion is the upper plate portion 10d of the feeder box 10.
And an inner ventilation pipe 52 whose upper end opening faces the outside of the feeder box 10 is provided. In this case, when the powder P is filled in the cavity, the air that has floated from the cavity in the powder P in the feeder box 10 rises in the internal ventilation pipe 52 and moves in the feeder box 10.
It is discharged to the outside, whereby the same effect as in the fifth embodiment is achieved.

(8) Eighth Embodiment FIG. 13 shows an eighth embodiment of the present invention. In the present embodiment, the upper end of the internal ventilation pipe 52 of the seventh embodiment does not protrude from the upper plate portion 10d of the feeder box 10, and the internal ventilation pipe 52 is similar to the sixth embodiment. A gutter-like member 60 extending to the left and right communicating with the inside of the internal ventilation pipe 52 is attached to a lower end of the 52. The gutter-shaped member 60 in this case has a semicircular cross section shown in FIG. 11A, and the same effects as in the sixth embodiment are provided.

[0033]

As described above, according to the present invention, when the powder is filled in the cavity, air is mixed into the powder and
By effectively discharging the air floating from inside the cavity, the fluidity of the powder into the cavity is improved, and the efficiency of filling the powder and the packing density are made uniform.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a powder feeder according to a first embodiment of the present invention.

FIG. 2 is a plan sectional view of the powder feeder according to the first embodiment of the present invention.

FIG. 3 is a side view showing a modified example of the powder feeder according to the first embodiment of the present invention.

FIG. 4 is a side sectional view showing another modification of the powder feeder according to the first embodiment of the present invention.

FIG. 5 is a plan sectional view showing a feeder box of a powder feeder according to a second embodiment of the present invention.

FIG. 6 is a side sectional view showing a feeder box of a powder feeder according to a third embodiment of the present invention.

FIG. 7 is a side sectional view showing a feeder box of a powder feeder according to a fourth embodiment of the present invention.

FIG. 8 is a side sectional view showing a modification of the fourth embodiment of the present invention.

FIG. 9 is a side sectional view showing a feeder box of a powder feeder according to a fifth embodiment of the present invention.

FIG. 10 is a side sectional view showing a feeder box of a powder feeder according to a sixth embodiment of the present invention.

FIGS. 11 (a) and (b) show a sixth embodiment of the present invention, respectively.
It is a perspective view which shows another aspect of the gutter-shaped member and internal ventilation pipe which concern on embodiment.

FIG. 12 is a side sectional view showing a feeder box of a powder feeder according to a seventh embodiment of the present invention.

FIG. 13 is a side sectional view showing a feeder box of a powder feeder according to an eighth embodiment of the present invention.

FIG. 14 is a partially sectional side view showing an example of a conventional powder feeder.

15 (a) to (d) are side sectional views sequentially showing an operation process of a conventional powder feeder and a flow state of the powder.

[Description of sign]

DESCRIPTION OF SYMBOLS 1 ... Die, 1A ... Die table, 3 ... Cavity, 10
... feeder box, 11 ... rod (drive means), 2
0, 20a: vent hole, 21: outer vent tube, 22: inner vent tube, 30, 32: cover, 40: opening, 50, 52 ...
Internal ventilation pipe, 60: gutter-like member (ventilation expansion member), P: powder.

Claims (10)

[Claims] 1. A die having a cavity, a die table in which the die is installed with the opening of the cavity facing upward, and a powder stored in the die table, and the die is placed on the die table from a standby position. A bottomless feeder box provided so that the lower end edge thereof slides forward and backward with respect to the cavity, and driving means for the feeder box, wherein the feeder box at the standby position is driven by the driving means. By advancing over the cavity,
The powder in the feeder box is filled into the cavity by flowing the powder therein, and thereafter, the feeder box is retracted to the standby position by the driving unit. A powder feeder characterized by having a ventilation hole penetrating inside and outside a box. 2. The powder feeder according to claim 1, wherein the ventilation hole is inclined upward toward the outside of the feeder box. 3. The powder feeder according to claim 1, wherein the vent hole is formed in a groove shape at a lower end edge of the feeder box, which is a sliding portion to the die table. 4. The powder feeder according to claim 1, wherein the feeder box is provided with an outer ventilation pipe extending upward from the ventilation hole to the outside of the feeder box. 5. The powder feeder according to claim 1, wherein the feeder box is provided with an inner ventilation pipe extending from the ventilation hole into the feeder box. 6. The feeder box according to claim 1, further comprising a cover that covers the ventilation hole from outside and slides on the die table integrally with the feeder box. A powder feeder according to any one of the above. 7. The feeder box according to claim 1, wherein the feeder box has an upward opening, and the feeder box is provided with a cover that covers the opening from outside. Powder feeder. 8. A die having a cavity, a die table in which the die is placed with the opening of the cavity facing upward, and a powder stored in the die table, and the die is placed on the die table from a standby position. A bottomless feeder box provided so that the lower end edge thereof slides forward and backward with respect to the cavity, and driving means for the feeder box, wherein the feeder box at the standby position is driven by the driving means. By moving the powder in the feeder box into the cavity by flowing the powder into the cavity by advancing the cavity above the die, and thereafter driving the feeder box back to the standby position, the powder feeder is provided. In the box, one end opening is buried in the powder stored in the feeder box, One powder feeder and the other end opening, characterized in that the internal vent tube is provided which extends up to the upper space of at least the feeder box. 9. The powder feeder according to claim 8, wherein an end of the internal ventilation pipe on the other end opening side penetrates the feeder box, and the other end opening faces the outside of the feeder box. . 10. A gutter-shaped ventilation expansion member having a groove-shaped opening directed downward and communicating with the inside of the internal ventilation pipe is provided at one end of the internal ventilation pipe in a state where a gap is formed between the internal ventilation pipe and the die table. The powder feeder according to claim 8, wherein the powder feeder is provided.