JP2847690B2 - Shoe box in powder molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe box in a powder molding machine.

[0002]

2. Description of the Related Art In powder metallurgy, a raw material powder mainly composed of metal is formed into a green compact by a powder forming apparatus.
The green compact is heated and sintered in a sintering furnace. FIG. 8 shows an example of a conventional powder molding press.
This will be described with reference to FIG. Die 1 is die 2
, A core rod 3, a lower punch 4, and an upper punch 5 for molding a cylindrical green compact. The core rod 3 is located in the die 2. The lower punch 4 has a cylindrical shape and is fitted between the die 2 and the core rod 3 from below. The upper punch 5 has a cylindrical shape and is fitted between the die 2 and the core rod 3 from above. Thus, the cavity 6 is formed between the die 2, the core rod 3, and the punches 4, 5. Feeding equipment
11, a hopper 13 is connected to the shoe box main body 12 via a flexible supply pipe 14, and a drive mechanism (not shown) is connected to the shoe box main body 12 via a feeder lever 15. . The shoe box body 12 has an opening at the lower surface, and the opening at the lower surface is larger than the outer periphery of the punches 4 and 5. A feeder lever 15 is connected to a rear portion of the shoe box main body 12, and the shoe box main body 12 linearly moves back and forth on the die 2 as shown by an arrow by driving of a driving mechanism. I have. The supply pipe 14 is connected to the upper part of the rear center of the shoe box main body 12 in a forward and downward direction.

[0003] In powder molding, as shown in the figure, the shoe box main body is moved to a position above the lower punch 4 with the upper punch 5 raised and separated from the die 2.
Move 12 forward. The hopper 13 that stores the raw material powder
The raw material powder is supplied into the shoe box main body 12 through the supply pipe 14 from the supply port. Along with this, the shoe box body 12
Reciprocates once or several times before and after the upwardly opened cavity 6 formed between the die 2, the core rod 3 and the lower punch 4, and the raw material powder enters the cavity 6 from within the shoe box body 12. Supplied. When the filling of the raw material powder into the cavity 6 is completed, the shoe box body
12 retreats from the position above the cavity 6. Then, the upper punch 5 descends and the die 2 and the core rod 3
And the die 2 is raised, and the raw material powder is compressed and solidified by the punches 4 and 5 between the die 2 and the core rod 3 to form a green compact.

[0004]

In the shoe box of the conventional powder molding apparatus, the raw material powder flows forward from the supply pipe 14 into the shoe box body 12 having no obstacles therein, and Since the box body 12 reciprocates in the front-back direction, the raw material powder easily flows in the front-rear direction of the shoe box body 12, but the raw material powder hardly flows in the left-right direction. Therefore, the cylindrical cavity 6
In the above, the raw material powder easily enters the front side a and the rear side b, but hardly enters the right side c and the left side d. Therefore, at the end of the filling, the density of the powder on the front side a and the rear side b of the cylindrical cavity 6 becomes higher, while the density of the powder on the right side c and the left side d becomes lower. As a result, there is a problem that the density of the formed cylindrical green compact is also non-uniform.

The present invention is intended to solve such a problem, and the raw material powder can be filled at a uniform density on the front side and the rear side and on the right and left sides of a cylindrical cavity formed in a mold. An object of the present invention is to provide a shoe box in a powder molding device.

[0006]

According to a first aspect of the present invention, there is provided a shoe box for a powder molding apparatus, comprising: a shoe box having an opening at a lower surface and a supply pipe connected to a rear portion thereof; A main body, and a guide plate provided in the shoe box main body so as to oppose the distal end opening of the supply pipe from below, and the guide plate has a tapered shape in which a planar shape becomes thinner toward the front. In addition, the upper surface is inclined with a direction of descending from the center toward both the left and right sides.

Further, the shoe box in the powder molding apparatus according to the second aspect of the present invention is capable of adjusting the angle of the included angle between the left and right sides of the guide plate.

[0008]

In the shoe box in the powder molding apparatus according to the first aspect of the present invention, when the raw material powder is supplied into, for example, a cylindrical cavity formed in the mold, the shoe box main body is positioned on the die above the cavity. To feed the raw material powder from the supply pipe into the shoe box main body, and reciprocate the shoe box main body back and forth on the die to drop the raw material powder into the cylindrical cavity from this shoe box main body and fill it I do. At this time, a guide plate is provided so that the supply pipe faces the opening at the tip of the supply pipe from below in the shoe box body connected to the rear part,
In addition, the guide plate has a tapered shape in which the planar shape becomes thinner toward the front, and the upper surface is inclined with a direction of descending from the center toward both the left and right sides, so that the raw material powder is It is guided by a guide plate in the box body and guided not only to the front and rear sides of the cylindrical cavity, but also to the right and left sides. As a result, the raw material powder is filled at a uniform density on the front and rear sides and on the right and left sides of the cylindrical cavity.

Further, in the shoe box of the powder molding apparatus according to the second aspect of the present invention, the angle between the left and right sides of the guide plate is adjusted according to conditions such as the diameter of the cylindrical cavity. Thereby, the direction of flow of the raw material powder is adjusted so that the raw material powder is filled at a uniform density on the front side and the rear side, the right side, and the left side of the cylindrical cavity.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a shoe box in a powder molding apparatus according to the present invention will be described below with reference to FIGS. Parts common to those in the conventional example shown in FIGS. 8 and 9 are denoted by the same reference numerals, and detailed description thereof will be omitted. In the shoe box of this embodiment, a guide plate is provided at a lower rear portion inside the shoe box body 12.
21 are provided. The planar shape of the guide plate 21 is a V-shaped tapered shape tapering forward. At the same time, the upper surface of the guide plate 21 is inclined in a direction of descending forward as a whole, and is inclined with a direction of descending from the center toward both left and right sides. Thus, the left and right sides of the upper surface of the guide plate 21 are inclined surfaces 21a and 21b, respectively.

Next, the operation of the above configuration will be described. At the time of powder molding, first, in the mold 1, the upper punch 5 is raised and separated from the die 2.
The shoe box body 12 is advanced to a position above the lower punch 4. Further, the raw material powder is supplied from the hopper 13 storing the raw material powder into the shoe box main body 12 through the supply pipe 14. At the same time, as shown in FIGS. 1 and 2, the shoe box main body 12 is positioned between the die 2 and the upwardly open cavity 6 formed between the die 2, the core rod 3, and the lower punch 4. To go back and forth once or several times. In this way, the raw material powder falls into the cavity 6 from the shoe box body 12 and is supplied. At this time, the raw material powder coming out of the leading end opening of the supply pipe 14 is guided by the guide plate facing the leading end opening of the supply pipe 14 from below.
First hit the top of 21. Thereafter, as shown by arrows in the drawing, the raw material powder is guided by the two inclined surfaces 21a and 21b on the upper surface of the guide plate 21 in the shoe box main body 12, and is guided to the front left and right sides. That is, since the upper surface of the guide plate 21 is inclined with the direction of descending from the center toward the left and right sides, the raw material powder is positively guided to the right side c and the left side d of the cylindrical cavity 6. At the same time, the guide plate 21 has a V-shaped tapered shape in which the planar shape becomes thinner toward the front, and the upper surface is entirely inclined in the direction to descend toward the front. Instead, it is guided almost equally forward. When the shoe box body 12 reciprocates back and forth, the shoe box body 12 is equally guided to the front side a and the rear side b of the cylindrical cavity 6. Thus, the raw material powder is filled at a uniform density on the front side a and the rear side b and the right side c and the left side d of the cylindrical cavity 6. After filling the raw material powder, the shoe box body
12 retreats from the position above the cavity 6. Then, the upper punch 5 is lowered and the die 2 is raised, so that the punches 4, 5 are moved between the die 2 and the core rod 3.
The raw material powder is compressed and hardened to form a green compact.

As described above, in the above embodiment, the raw material powder can be filled at a uniform density in the front side a and the rear side b, the right side c and the left side d of the cylindrical cavity 6 formed in the mold 1. Also, the density of the formed cylindrical green compact can be made uniform.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the angle θ between the left and right sides of the guide plate 31 provided in the shoe box main body 12 can be adjusted. For this purpose, the guide plate 31 is formed of a pair of guide plate members 32 and 33 which can be opened and closed in a horizontal direction about a front end thereof.
And a flexible connecting plate 34 made of rubber or the like for connecting the guide plate members 32 and 33. The two guide plate members 32 and 33 are connected by a shaft 35 at their front end portions, and are slidably supported by a pair of fixed plates 36 and 37 at a rear portion in the shoe box body 12. Have been. For example, one of the fixing plates 36 and 37 is fixed to the shoe box main body 12, while the other is not fixed, and is fixed to each other by fixing tools 38 such as bolts and nuts. .
Thus, when the fixture 38 is loosened, the two guide plate members 3
The guide plates 2 and 33 can be fixed to each other when the fixture 38 is tightened. Of course, the guide plate 31 has a V-shaped tapered shape in which the planar shape becomes thinner toward the front, and the upper surface of the guide plate 31 is inclined in a direction in which the entire upper surface is lowered toward the front. At the same time, the upper surfaces of the two guide plate members 32, 33 are inclined surfaces 31a, 32b inclined in a direction of descending from the connecting plate 34 toward the left and right sides, respectively.
It has become.

In the shoe box of the second embodiment, the included angle θ between the left and right sides of the guide plate 31 is adjusted according to conditions such as the diameter of the cylindrical cavity 6. Thereby, the direction of the flow of the raw material powder is adjusted to an optimum direction, and the front side a and the rear side b and the right side c of the cylindrical cavity 6 are adjusted.
In addition, the raw material powder is filled at a uniform density with the left side d. That is, one shoe box can cope with a difference in conditions such as the diameter of the cavity 6. If the cavities 6 are the same, the smaller the angle θ between the left and right sides of the guide plate 31 is, the more raw material powder can enter the cavities 6.

The present invention is not limited to the above embodiment, but can be variously modified. For example,
The green compact to be molded is not limited to a cylindrical one, but may be a square tubular one or the like.

[0016]

According to the first aspect of the present invention, a guide plate is provided in the shoe box body, which moves forward and backward, with the supply pipe connected to the rear part, facing the opening at the tip of the supply pipe from below. Has a tapered shape in which the plane shape becomes narrower toward the front, and the upper surface is inclined with a direction of falling from the center toward both the left and right sides, so that the cavity of the mold to which the raw material powder is supplied Is cylindrical, the guide plate guides the raw material powder supplied into the shoe box main body not only to the front and rear sides of the cylindrical cavity, but also to the right and left sides, and to the front side of the cylindrical cavity. The raw material powder can be filled at a uniform density on the rear side, the right side and the left side, and the density of the formed cylindrical green compact can be uniform.

Further, according to the second aspect of the present invention, the angle between the left and right sides of the guide plate can be adjusted, so that the raw material powder on the guide plate can be adjusted according to conditions such as the diameter of the cylindrical cavity. The direction of flow can be optimized, and the raw material powder can be filled at a uniform density on the front and rear sides and on the right and left sides of the cylindrical cavity. it can.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a shoe box according to the present invention, in a state where a shoe box main body is advanced when raw material powder is supplied.

FIG. 2 is a longitudinal sectional view showing a state where the shoe box main body is retracted when supplying the same raw material powder.

FIG. 3 is a horizontal sectional view of the same.

FIG. 4 is a cross-sectional view of the same.

FIG. 5 is a horizontal sectional view showing a second embodiment of the shoe box of the present invention.

FIG. 6 is a longitudinal sectional view of the same.

FIG. 7 is a transverse sectional view of the same.

FIG. 8 is a longitudinal sectional view showing an example of a conventional shoe box.

FIG. 9 is a horizontal sectional view of the same.

[Explanation of symbols]

 12 Shoe box body 14 Supply pipe 21 Guide plate 31 Guide plate

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B30B 11/00 B22F 3/035

Claims (2)

(57) [Claims] 1. A shoe box main body having an opening on a lower surface and having a supply pipe connected to a rear part thereof, the shoe box main body moving back and forth, and a guide plate provided in the shoe box main body so as to face a front end opening of the supply pipe from below. The guide plate has a tapered shape in which the planar shape becomes thinner toward the front, and the upper surface is inclined with a direction of descending from the center toward both left and right sides. Shoe box in powder molding equipment. 2. The shoe box according to claim 1, wherein the guide plate is capable of adjusting the angle between the left and right sides of the guide plate.