JPH08197168A - Discharging and transporting device for green compact from compression molding machine - Google Patents

Abstract

PURPOSE: To automate discharging from dies, transporting and inverting and aligning of postures of green compacts. CONSTITUTION: A pressing piece 15 disposed in a power feed box 11 advancing from backward advances while pushing and moving the green compact B forward when the green compact B after molding automatically ascends and extricates from the die 3. The green compact B is thereby discharged to the front end of the die 3 and is automatically delivered onto an inclined chute 16 continuous with the die 3. The green compact B gliding by gravity on the inclined chute 16 is inverted by a posture turning means in mid-way and is aligned to a specified posture. The green compact is then transported to the ensuing stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for discharging a green compact molded by a compression molding machine from a lower mold and carrying it to the next step or the like.

[0002]

2. Description of the Related Art For example, a cylindrical member used for automatic rotation returning means of a chair is manufactured by a powder metallurgy method. That is, a compact is used to form a green compact having substantially the same shape as the finished product, which is then taken out from the lower mold and sintered in a sintering furnace. At this time, the green compact raised from the lower punch after molding must be discharged to the outside of the lower mold, but if the total length of the green compact is long, the vertical movement stroke of the die set is limited. Therefore, it is difficult to install an automatic ejector or the like. Therefore, conventionally, the operator takes out one punch for each punch, which is not preferable for safety and is inefficient.

For this purpose, it is necessary to align them in a certain posture during the transportation, and since this is also done manually by the same manner as described above, the same difficulties as described above occur.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is possible to automatically perform discharge from a lower mold of a powder compact, conveyance, and reversal alignment of postures. The purpose is to provide a device.

[0005]

According to the present invention, the above-mentioned problems are solved by discharging a green compact having a bottom surface inclined and a diameter-expanding flange at the upper end from a compression molding machine, and then reversing the posture to a predetermined value. It is a device for discharging and conveying the powder compact that is conveyed to a position, and at the tip of the powder feeding box that fills the raw powder in the lower mold of the compression molding machine, A pressing piece for pressing the portion just below the radial flange from behind is provided, and an inclined chute for sliding down the extruded green compact is provided in front of the lower die so as to be continuous with the upper surface of the lower die, and The problem can be solved by providing a posture changing means for vertically inverting the posture of the work in the middle of the conveying path.

[0006]

[Function] When the molded powder compact lower mold is automatically lifted and escaped, the pressing piece provided on the powder feeding box moving from the rear moves forward while moving the powder compact forward, so that the powder compact is removed. It is discharged to the front end of the lower mold and automatically sent out on an inclined chute that is continuous with the lower mold.

The powder compact that slides down naturally on the inclined chute is
The posture is reversed by the posture changing means on the way, the posture is aligned in a fixed posture, and the sheet is conveyed to the next step.

[0008]

FIG. 1 is a longitudinal sectional view of the main part of the present invention. As an example of the green compact, a cylindrical cam (B) also serving as a bearing as shown in FIG. 2 is cited. The cylindrical cam (B) is a cylinder
The upper end of (T) has a flange (F), and the lower end surface has
A cam surface (C) inclined with respect to the central axis (A) is formed. A through hole (H) is formed at the center.

The upper die (upper punch) (1) is attached to the upper die holder (2), and both of them move up and down as a unit. Lower mold
(3) is fixed and held by the lower die holder (4),
The upper surfaces of both of them are coplanar and form a common upper surface (10). The lower mold (3) has a large-diameter shallow hole (5) into which the lower part of the upper mold (1) can be fitted, followed by a small-diameter deep hole.
(6) and are machined on the same axis. Further, a cylindrical lower punch (7) is vertically movably fitted into the small-diameter hole (6). At the center of the lower punch (7), the core rod (9)
Is pierced.

Upper end surface of the lower punch (7) in the lower die (3)
The space formed above (8) serves as a mold cavity in which the raw material is filled and compression molding is performed.

On the common upper surface (10), the powder compact ascended after compression molding, that is, the cylindrical cam (B) is extruded toward the next step, and the raw material powder is supplied to the die cavity. Powder box (1
1) is provided so as to slide back and forth. This powder feeding box (1
A supply chamber (13) having an open bottom surface (12) is formed in the inside of (1), and the supply chamber (13) communicates with a raw material supply pipe (14). At the front end of the powder feeding box (11), as shown in FIG.
For example, a fork-shaped pressing piece for pushing the cylindrical cam (B) forward
(15) is replaceably installed. The reason why it is replaceable is that it corresponds to a mold to be replaced depending on the type of green compact.

A cylindrical cam (B) is attached to the tip of the lower die holder (4).
A transfer chute (16) is mounted so that it can slide down naturally. As shown in FIG. 4, a means for reversing the cylindrical cam (B) to a convenient posture for the next step, for example, the entire cylindrical cam is turned upside down in the middle of the conveying path of the conveying chute (16). There is provided a posture changing means including an easy steep slope portion (17) and a stopper portion (18) for temporarily stopping the work at the position of the steep slope portion.

Next, the details of the operation will be described. In FIG. 1, the upper die (1) is raised and the lower punch (7) is lowered,
Further, the powder feeding box (11) is in the retracted position, and the operation can be started at any time. Note that the two-dot chain line cylindrical cam (B) is shown in a raised position irrespective of other portions for ease of explanation.

At this time, the raw material powder is already stored in the supply chamber (13) of the powder feeding box (11) through the raw material supply pipe (14). If the entire device is started in this state, the powder feeding box (1
1) starts moving forward to the left in Fig. 1, and the pressing piece at its front end
(15) has not yet escaped, but after contacting the cylindrical cam (B) which is assumed to have come to the elevated position, it pushes it out toward the inclined transfer chute (16) as it is. Supply room soon
When the opening of (13) reaches above the mold cavity, the raw material powder begins to fall into the mold cavity, and eventually the raw material powder moves to a position where the opening completely overlaps the mold cavity. Completely fills the mold cavity.

At this time, the pressing piece (15) is after the virtual product material has already been extruded onto the conveying chute (16). Now, at the same time as the first filling of the raw material into the mold cavity,
(11) begins to move backward, and finally returns to the initial position shown in FIG. During this backward movement, the bottom surface (12) of the powder feeding box (11) is the common top surface.
(10) Since it slides on the top, the excess raw material protruding from the mold cavity is scraped off, and a certain amount of raw material remains in the mold cavity.

At the same time that the powder feeding box (11) is retracted to the initial position, as shown in FIG. 5, the upper mold (1) is lowered and the raw material filled in the mold cavity is compressed and solidified. . Almost at the same time, the powder feeding box (11) started to move forward again, and the upper mold (1)
Starts to rise, the lower punch (7) rises to follow it, and the cylindrical cam (B) just molded is pushed up onto the upper surface of the lower die as shown in FIG. In the initial stage at this pushed-up position, the lower punch (7) is still protruding above the lower mold so that the cylindrical cam (B) does not fall, but due to the advance of the powder feeding box (11). When the pressing piece (15) at the front end reaches the cylindrical cam (B), the lower punch (7) descends to a position where it does not hinder the passage of the powder feeding box (11).

When the fork-shaped pressing piece (15) comes into contact with the rear surface of the cylindrical cam (B) that has come out at a predetermined position, it pushes it toward the inclined transfer chute (16) as it is,
At this time, the lower punch (7) lowers the cylindrical cam (B) to incline forward, but as shown in FIG. 8, the pressing piece (15) is caught on the flange (F) of the cylindrical cam (B). It is pushed as it is up to the transfer chute (16). Thus cylindrical cam
As shown in FIG. 9, (B) turns to the forward leaning posture, and the pressing piece (1
5) It separates and falls on the transport chute (16) and slides down naturally.

The cylindrical cam (B) that slides down is in a posture closer to an inverted state due to the steep slope (17) shown in FIG. 4 provided on the way, but the flange (F) is the stopper portion (18).
When it hits, it stands completely upside down and is sent to the next process in that position.

[0019]

EFFECTS OF THE INVENTION According to the present invention, since discharge of a compact from a lower mold of a compression molding machine, conveyance, and posture reversal alignment can be automatically performed, safety is high and productivity is high. Is greatly improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a compression molding machine to which an embodiment of the present invention is applied.

FIG. 2 is a perspective view showing an example of a green compact.

FIG. 3 is a perspective view of the pressing piece.

FIG. 4 is a view showing a posture changing means of the green compact.

5 is a vertical cross-sectional view showing a state of a green compact by the apparatus of FIG.

FIG. 6 is an explanatory diagram showing a moving state of a green compact by a pressing piece.

FIG. 7 is an explanatory view showing a discharge state from the lower mold of the green compact.

FIG. 8 is an explanatory view showing a situation during movement of the green compact.

FIG. 9 is an explanatory view showing a transfer situation of the green compact onto the inclined chute.

[Explanation of symbols]

 (A) Center axis (B) Cylindrical cam (compact powder) (C) Cam surface (F) Flange (H) Through hole (T) Cylindrical part (1) Upper mold (2) Upper mold holder (3) Lower mold (4) Lower die holder (5) Large diameter shallow hole (6) Small diameter deep hole (7) Lower punch (8) Upper end surface (9) Core rod (10) Common upper surface (11) Powder feeding box (12) Bottom (13) Supply chamber (14) Raw material supply pipe (15) Pressing piece (16) Transfer chute (18) Steep slope part (19) Stopper part

Claims (1)

[Claims] 1. A compact is compacted with a bottom surface inclined and a diameter-increasing flange at the upper end, which is discharged from a compression molding machine and then inverted to convey it to a predetermined position.
It is a device for discharging and conveying powder compacts, and presses directly below the diameter expansion flange of the powder compact that has risen and escaped from the lower mold at the tip of the powder feeding box that fills the raw powder into the lower mold of the compression molding machine. While providing a pressing piece to, in front of the lower mold, an inclined chute for sliding down the extruded green compact is provided so as to be continuous with the upper surface of the lower mold, and in the middle of the conveying path of the inclined chute,
A device for discharging and conveying a powder compact from a compression molding machine, which is provided with a posture changing means for vertically inverting a posture of a work.