JP2003164995A - Feeder for powder moulding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feeder which can collect a raw material powder leaked out during filling and recycle it by filling again. <P>SOLUTION: A feeder body 15 movable in the longitudinal direction and a sliding plate 16 provided ascendably/descendably on the front face of the feeder body 15 are provided. An air cylinder 20 to drive the sliding plate 16 is fixed on the rear face of the feeder body 15 and the air cylinder 20 and the sliding plate 16 are connected by a link arm 24. The sliding plate 16 is ascended during filling of the raw material powder P, after filling, the raw material powder P1 leaked out from an opening hole 3 is held by descending the sliding plate and collected following retreat of the feeder body 15. The collected raw material powder P1 is filled in the opening hole 3 in a state that the sliding plate 16 is ascended by advance of the feeder body 15. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a feeder for a powder molding machine.

[0002]

For example, in powder metallurgy, a raw material powder containing a metal such as iron as a main component is compressed by a powder molding press to mold a green compact, and the green compact is sintered in a sintering furnace. And heat to sinter.

By the way, in a powder feeding apparatus, generally, a raw material powder is supplied from a raw material container storing the raw material powder into a feeder main body which moves on the molding die, and the feeder main body supplies the raw material powder to the molding die. The raw material powder is filled inside. A molding die of this type is shown in FIG. This is a die 2 fixed to a die plate 1, a lower punch 4 fitted into an opening hole 3 formed in the die 2 from below, and an upper punch fitted into the opening hole 3 from above. 5 and these die 2 and lower punch 4
A cavity 6 is formed between the upper punch 5 and the upper punch 5. Then, in powder molding, the upper punch 5 is raised and the feeder main body 7 is reciprocated once or several times back and forth above the opening hole 3 formed in the die 2 as shown by a chain line in FIG. The raw material powder P is supplied from the feeder main body 7 into the opening hole 3. Then, when the filling of the raw material powder P into the opening hole 3 is completed, the feeder main body 7 retracts and is removed from the position above the opening hole 3. Then, the upper punch 5 descends and is fitted into the opening hole 3 of the die 2, and the die 2 descends, and the raw material powder is compressed and hardened by the lower punch 4 and the upper punch 5 to form a green compact. it can. After that, the upper punch 5 rises, the die 2 further descends, and the green compact is extracted from the die 2 by the lower punch 4. Further, as the feeder main body 7 moves forward for powder feeding as described above, the powder compact is discharged by the feeder main body 7. Such a molding cycle is repeated.

In the feeder of the conventional powder molding apparatus as described above, when compressing the raw material powder P filled in the cavity 6, the raw material powder P may leak from the opening hole 3. Further, depending on the shape of the green compact to be molded, as shown in FIG. 6, there may be a case where a stepped relief portion 3B is continuously provided in the opening hole 3 of the die 2 and thus leaks from the opening hole 3 in this way. The raw material powder P1 and the raw material powder P1 accumulated in the escape portion 3B will remain after the green compact is molded. Therefore, when the feeder main body 7 is advanced to mold the green compact next time, the leakage thereof is caused. The raw material powder P1 is pushed out by the front wall portion of the feeder main body 7 and is accumulated at the forward stop position of the feeder main body 7 as shown by a chain line in FIG. If the raw material powder P1 accumulated at the forward stop position of the feeder main body 7 is left as it is, not only the die 2 becomes dirty and it causes a failure of the apparatus, but also the loss of the raw material powder P which becomes the green compact. As a result, the product cost will be increased. For this reason,
In order to collect and reuse the leaked raw material powder P1, it is necessary to temporarily stop the powder molding device, remove the leaked raw material powder P1, collect the collected raw material powder P1 and return it to the feeder main body 7. In such a method, the compacting speed of the green compact is significantly reduced. Furthermore, it takes a lot of trouble to collect the raw material powder P. That is, on the upper surface of the die 2 on which the feeder main body 7 slides in the front-back direction, a counterbore portion 11 for accommodating the head of the bolt 9 is formed in the through hole 10 of the bolt 9 for fixing the die 2 and the like. Since the head of the bolt 9 does not protrude, the raw material powder P is clogged inside the countersunk portion 11, and it takes a very troublesome time to remove the raw material powder P1 from the countersunk portion 11. The molding speed of the green compact is further reduced.

The present invention solves these problems, and a raw material powder leaked from an opening formed in a die can be easily recovered, and the recovered raw material powder can be reused. The purpose is to provide a feeder.

[0006]

In the feeder for powder molding apparatus according to claim 1 of the present invention, the raw material powder is supplied to the feeder main body having the lower surface opened, and the feeder main body advances along the die, After filling the raw material powder into the opening hole formed in the inside, in a feeder for a powder molding apparatus that retreats, a slide plate for collecting the raw material powder on the die leaked from the opening hole is moved up and down in the feeder body. It is provided as possible.

In powder molding, the feeder body is moved back and forth once to several times at a position above the opening hole formed between the die and the lower punch with the upper punch raised and separated from the die. Thus, the raw material powder in the feeder main body is filled from the opening hole. After filling the raw material powder, after retracting the feeder body, the upper punch is lowered to fit the die, and the die is lowered, and the raw powder is compressed and solidified by the lower punch and the upper punch. A green compact is formed. After that, as the upper punch rises, the die further descends, and the green compact is extracted from the die by the lower punch. Although such a molding cycle is repeated, when the raw material powder is compressed by the lower punch and the upper punch, the raw material powder filled in the opening holes of the die leaks from the opening holes due to the pressure received from the lower punch and the upper punch. It easily scatters around the openings, but after filling the raw powder,
By lowering the sliding plate and bringing it into contact with the upper surface of the die, the raw material powder leaked from the opening hole is collected by the sliding plate as the feeder main body retracts.

According to a second aspect of the present invention, there is provided a feeder for a powder molding apparatus according to the first aspect, wherein the sliding plate is raised when the raw material powder is advanced, and the powder is collected by the sliding plate. The raw material powder is filled in the opening hole by the forward movement of the feeder main body.

The raw material powder collected by the sliding plate is raised by raising the sliding plate during the filling of the raw material powder, and when the feeder main body is advanced to fill the raw material powder again, the front wall portion of the feeder main body The raw material powder extruded and leaked is filled in the opening hole of the die, and then the raw material powder supplied into the feeder main body is filled in the opening hole of the die. As a result, the leaked raw material powder and the collected raw material powder can be continuously filled.

According to a third aspect of the present invention, there is provided a powder molding apparatus feeder according to the first or second aspect, wherein the sliding plate is formed of a flexible resin and the sliding plate is formed. The lower end of the is formed into an edge shape.

With this structure, even if a through hole for a bolt having a countersunk portion is formed on the sliding surface of the feeder main body of the die, the sliding plate will move along the concave portion if there is a slight step. It is possible to satisfactorily scrape out the raw material powder that has been bent and accumulated in the concave portion.

A feeder for a powder molding apparatus according to claim 4 of the present invention is the feeder for a powder molding apparatus according to any one of claims 1 to 3, wherein one wall surface of the feeder main body facing the sliding plate. Is provided with a flange portion that slides along the die, drive means for moving the slide plate up and down is provided on the flange portion, and a link mechanism that connects the drive means and the slide plate is provided. .

With this structure, when the sliding plate is brought into contact with the die, the driving means for driving the sliding plate receives a reaction of the sliding plate, and a force on the side opposite to the sliding plate is applied. In addition, by connecting the sliding plate and the driving means with a link mechanism, a downward force in the same direction as the sliding plate is applied to the flange portion that fixes the driving means. This allows the sliding plate and the flange of the feeder main body to be in close contact with the die when the feeder main body is retracted after filling the raw material powder, preventing the raw material powder remaining inside the feeder main body from leaking out. can do.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In the following description, the same parts as those in FIG. 6 described above are designated by the same reference numerals. As shown in FIG. 1, the mold of the powder molding apparatus is composed of a die 2 fixed to a die plate 1, a lower punch 4 and an upper punch 5, and the inside of the die 2, that is, the die 2 and the upper punch 5 and the lower punch 5. A cavity 6 is formed between the punch 4 and the punch 4. In the figure, 8 is a fixing frame for the die 2, 9 is a bolt for fixing the fixing frame 8 to the die plate 1, 10 is a through hole for the bolt 9, and the through hole 10 is provided at the periphery of the opening of the bolt 9 It has a large counterbore 11 for accommodating the head of the.

The feeder main body 15 includes a front wall portion 15A and a rear wall portion.
15B, left and right side wall portions 15C and an upper wall portion 15D, which are formed in a box shape with an open lower surface. A flexible supply pipe 30 is connected to the upper wall portion 15D of the feeder main body 15, and the raw material powder P of the hopper 31 is fed from the supply pipe 30 to the feeder main body.
Supplying to 15. Also, the front wall portion 15 of the feeder main body 15
A guide plate 17 is fixed to A at a distance from the front wall portion 15A, and a sliding plate 16 is vertically movable between the guide plate 17 and the front wall portion 15A. The sliding plate 16 is made of a flexible synthetic resin, and by forming a tapered surface 16A on the inner surface side lower portion of the sliding plate 16, an edge portion 19 is formed at the lower end edge. Further, the sliding plate 16 is an air cylinder 20 as a driving means attached to the feeder main body 15.
It is designed to move up and down. Air cylinder 20
The cylinder body 21 including the piston rod 21A is fixed to the upper surface of a flange portion 22 integrally formed with the lower end portion of the rear wall portion 15C of the feeder body 15. In this way, the air cylinder 20 fixed to the rear side of the feeder main body 15 and the sliding plate 16 provided on the front side of the feeder main body 15 have a link mechanism.
Connected by 23. The link mechanism 23 has a pair of left and right link arms 24 and a rear arm 25 laid over the rear end of the link arm 24, and is formed in a U-shaped frame shape. By feeder body 15
The left and right side wall portions 15C of the same are pivotally attached, the front portion thereof is pivotally attached to the sliding plate 16, and the rear arm 25 hung over the rear end portion of the link arm 24 is pivotally attached to the piston rod 21A. .
As a result, the sliding plate 16 moves up and down in conjunction with the up-and-down movement of the piston rod 21A, and comes into contact with the upper surfaces of the die plate 1 and the die 2 when it goes down. Further, a drive mechanism (not shown) is connected to the feeder main body 15 so as to move linearly back and forth on the die plate 1 and the die 2 as shown by an arrow in FIG.

The operation of the above configuration will be described. In powder molding, the upper punch 5 is raised to raise the die 2
The feeder main body 15 is advanced to a position above the lower punch 5 on the die plate 1 and the die 2 in a state of being separated from. When the feeder main body 15 moves forward, the die 2 is lowered, and the upper surface of the die 2 and the upper surface of the lower punch 5 are at the same height. The opening hole 3 that opens upward is formed between the lower punch 5 and the lower punch 5. Then, the raw material powder P is supplied from the hopper 31 storing the raw material powder P into the feeder main body 15 through the supply pipe 30. At the same time, as shown in FIG. 1, the feeder main body 15 is reciprocated on the die 2 back and forth once to several times at a position above the opening hole 3 formed between the die 2 and the lower punch 5. Therefore, the raw material powder P is supplied to the cavity 6. At this time, the sliding plate 16 provided on the front side of the feeder main body 15 is at the upper limit position, and the sliding plate 16 is not in contact with the die plate 1 and the die 2. When the filling of the raw material powder P into the opening hole 3 is completed in this way, the feeder main body 15
Moves backward and is removed from the position above the opening hole 3. At this time, the piston rod 21A of the air cylinder 20 is raised, and the sliding plate 16 attached to the front side of the feeder main body 15 is lowered via the left and right link arms 24. As a result, the sliding plate 16
An edge portion 19 formed on the lower end edge of the is in contact with the upper surfaces of the die plate 1 and the die 2. Then, after filling the raw material powder P into the cavity 6 through the opening hole 3, the feeder main body 15 is retracted to perform the compression step of the raw material powder P. That is, the upper punch 5 is lowered to fit into the die 2, and the die 2 is lowered, and the raw material powder P is compressed and solidified by the lower punch 5 and the upper punch 5 to form a green compact. It After that, the upper punch 5 rises, the die 2 further descends, and the green compact is extracted from the die 2 by the lower punch 5. Although such a molding cycle is repeated, when the raw material powder P is compressed by the lower punch 5 and the upper punch 5, the raw material powder P filled in the opening holes 3 of the die 2 is pressed by the lower punch 5 and the upper punch 5. Therefore, it easily leaks from the opening hole 3 and scatters on the periphery of the opening hole 3. In particular, as shown in FIGS. 1 to 5, depending on the shape of the green compact formed by the lower punch 5 and the upper punch 5, a stepped escape portion 3B for escaping the raw material powder P is formed at the opening edge of the opening hole 3. In this case, the raw material powder P may be placed in the escape portion 3B.
And the amount of the raw material powder P1 leaking from the opening 3 also increases. On the other hand, when the raw material powder P in the feeder body 15 is filled into the cavity 6 through the opening holes 3,
Once on the upper surface of the die plate 1 and die 2 in the front-back direction ~
Since the raw material powder P1 leaked to the peripheral portion of the opening hole 3 is reciprocated several times, the raw material powder P1 is extruded from the peripheral portion of the opening hole 3 to the most advanced position of the feeder body 15 by the front wall portion 15A of the feeder body 15. , In the middle, through hole for the bolt 9
Accumulates in 10 spots 11 However, as described above, after the raw material powder P is filled in the cavity 6, at the forward position of the feeder main body 15, the sliding plate 16 is lowered by the air cylinder 20 and pressed against the die plate 1, so that the feeder main body 15 is pressed. The raw material powder P1 collected on the front surface side of the front wall portion 15A is stored between the tapered surface 16A formed at the lower end of the sliding plate 16 and the front wall portion 15A of the feeder main body 15. As a result, as the feeder body 15 moves backward, the leaked raw material powder P1 is collected by the sliding plate 16 to the retracted position of the feeder body 1. In addition, sliding plate 1
6 has flexibility and has a thin-walled edge portion 19 at the lower edge, so that the edge portion 19 is the die plate 1
The raw material powder P1 that flexes along the recessed spot facing portion 11 or the relief portion 3B and collects in the spot facing portion 11 or the relief portion 3B can also be scraped out satisfactorily. In this way, the raw material powder P1 collected in the opening hole 3, the counterbore portion 11 and the escape portion 3B can be efficiently collected by the sliding plate 16. Further, as shown in FIG. 2, the sliding plate 16 is attached to the die plate 1 by the air cylinder 20.
Also, a downward force F that presses the die 2 is applied, and the opposite force is applied to the air cylinder 20 by its reaction, but the sliding plate 16 is connected to the air cylinder 20 by the link arm 24, and the air cylinder 20 is attached to the air cylinder 20. A downward force F1 in the same direction as the sliding plate 16 is applied. Since the air cylinder 20 is fixed to the upper surface of the flange portion 22 which is integrally formed with the lower end portion of the rear wall portion 15C of the feeder main body 15, the die plate 1 and the die 2 are mounted on the air cylinder 20 via the flange portion 22. It will be pressed. Therefore, when the feeder main body 15 is retracted after the raw material powder P is filled, the sliding plate 16 and the flange portion 22 formed on the rear wall portion 15C of the feeder main body 15 can be brought into close contact with the die plate 1 and the die 2. It is possible to prevent the raw material powder P remaining inside the feeder main body 15 from leaking out from the feeder main body 15. Further, when the raw material powder P inside the feeder main body 15 is filled in the cavity 6 again, the raw material powder P1 recovered by the sliding plate 16 is raised by raising the sliding plate 16 as shown in FIG. It can be pushed out by the front wall portion 11A of the feeder main body 15 to fill the cavity 6 through the opening hole 3A. As described above, the raw material powder P1 leaked during the filling is collected and filled in the cavity 6, so that the raw material powder P is not lost. Further, since the leaked raw material powder P1 can be continuously collected and filled while the powder molding apparatus is continuously operated, the compacting speed of the green compact is not reduced.

Although the feeder in the powder molding apparatus of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made. For example, the shape of the sliding plate 16 and the basic shape of the feeder main body 15 are not limited to those in the above embodiment.

[0018]

According to the feeder for powder molding apparatus of claim 1 of the present invention, the feeder main body advances onto the die to fill the raw material powder into the die, and then the sliding plate is brought into contact with the die to form the die. The raw material powder leaked from the opening hole can be collected by the sliding plate. This can prevent the loss of the raw material powder.

According to the feeder for powder molding apparatus of claim 2 of the present invention, the raw material powder collected by the sliding plate can be filled in the cavity of the powder molding apparatus, and the leaked raw material powder and the same can be collected. The filling can be continuously processed, and the molding speed of the raw material powder can be improved.

Furthermore, in addition to the effect of claim 1 or 2, the feeder for a molding apparatus according to claim 2 of the present invention efficiently uses the sliding plate to feed the raw material powder collected in the counterbore or recess which is recessed from the die. Can be collected.

Further, in the feeder for molding apparatus according to claim 4 of the present invention, the sliding plate and the flange portion of the feeder main body can be brought into close contact with the die, and after the raw material powder is filled, the feeder main body is retracted to the initial position. At this time, leakage of the raw material powder remaining in the feeder body can be effectively suppressed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a usage state of a powder molding apparatus having a powder molding apparatus feeder according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where the feeder of the one embodiment has moved to an advanced position and is using raw material powder.

FIG. 3 is a sectional view showing a compressed state of the raw material powder.

FIG. 4 is a cross-sectional view showing a state in which the raw material powder has been filled and then moved to the retracted position of the feeder.

FIG. 5 is an explanatory view showing a perspective view of the same feeder.

FIG. 6 is a vertical sectional view showing a conventional feeder for powder molding apparatus.

[Explanation of symbols]

Two dies 3 openings 4 Lower punch 5 Upper punch 15 feeder body 16 sliding plate 19 Edge part 20 Air cylinder 22 Flange 23 Link mechanism P raw material powder P1 Leaked raw material powder

Claims (4)

[Claims] 1. A raw material powder is supplied to a feeder main body having an opening on the lower surface, the feeder main body advances along a die, and the raw material powder is filled in an opening hole formed in the die and then retreats. In the feeder for a powder molding apparatus, the feeder main body is provided with a slide plate for collecting the raw material powder on the die leaking from the opening hole so as to be able to move up and down. 2. When the raw material powder is moved forward, the sliding plate is raised, and the raw material powder collected by the sliding plate is filled in the opening hole by the forward movement of the feeder main body. The feeder for powder molding apparatus according to claim 1. 3. The feeder for a powder molding apparatus according to claim 1, wherein the sliding plate is formed of a flexible resin, and the lower end portion of the sliding plate is formed in an edge shape. . 4. A flange portion that slides along the die is provided on one wall surface of the feeder main body that faces the sliding plate, and driving means for moving the sliding plate up and down is provided on the flange portion. 4. A link mechanism for connecting a means and the sliding plate is provided.
The feeder for powder molding equipment according to the item.