JPH06170597A - Device for discharging green compact in compacting press - Google Patents

Abstract

PURPOSE:To discharge a green compact without damaging it in a compacting press whose lower punch is protruded from the upper surface of a die when the green compact which has a boss part on the bottom side of a gear part is taken out. CONSTITUTION:When a feeder 26 is advanced, the boss part 13 of the green compact 11 is surrounded from the back and pushed with an approximately U-shaped first discharging body 32 and the gear part 12 of the green compact 11 is placed on the first discharging body 32. When the feeder 26 is furthermore advanced, the first discharging body 32 is pressed down with a press tool 36. In accordance with that, the green compact 11 is placed on a die plate 17 and the first discharging body 32 is separated from the gear part 12. After that, the feeder 26 is retracted. When next the feeder 26 is advanced, the green compact 11 which is discharged with the first discharging body 32 is pushed with a secondary discharging body 41 and discharged up to a chute 23. The secondary discharging body 41 is lowered with cams 47, 48 and a cam follower at the time of advancing and does not interfere with the green compact 11 by being lifted at the time of retracting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder compacting device for powder compacting press used in powder metallurgy.

[0002]

2. Description of the Related Art In powder metallurgy, a raw material powder is compressed by a powder molding press to form a green compact, and the green compact is heated in a sintering furnace to form a sintered body. The powder molding press includes a die and a molding die having an upper punch and a lower punch that are slidably fitted in the die in the vertical direction, and the die and the die to which the die is fixed. It is equipped with a feeder that moves back and forth on the plate to supply the raw material powder into the die. At the time of molding, the feeder is first positioned above the die, and the raw material powder is supplied from the feeder into the die. Then,
After the feeder retracts from the die, the lower punch that descends fits into the die and pressurizes the raw material powder in the die from above, and for example, the lower punch lowers the raw material powder by lowering the die. Then, the green compact is pressed to form a green compact. Then, the upper punch rises to come off the die, and the die further descends, whereby the lower punch pushes up the green compact, and the green compact is ejected from the die. Then, the feeder advances again above the die, the raw material powder is supplied into the die, and the above steps are repeated.
At this time, when the feeder pushes the green compact forward, the green compact is discharged from the die and, for example, put into a chute to a deburring machine or the like.

By the way, the green compact before sintering is fragile and must be handled carefully. As mentioned above, if the green compact after molding is discharged by the feeder,
This dispensing can be automated, but depending on the shape of the green compact, it is not possible to dispense the green compact simply by directly pushing the green compact forward through the flat front surface of the box-shaped feeder. Or the green compact may be damaged. Further, particularly when the green compact is large, the die itself may be large, and the stroke of the feeder may not be sufficient to discharge the green compact to the chute outside the die plate. So, manually
It is also practiced to take out the green compact after molding, but of course, it is inefficient.

There is a case where the dispensing is not successful simply by pushing it forward by the feeder, for example, as shown in FIG. The green compact 1 shown in FIG. 3 has a substantially annular shape, and a boss portion 3 having a smaller outer diameter is coaxially provided below the gear portion 2. And
A die 6 for molding the green compact 1 includes a cylindrical die 8 fixed to a die plate 7, a lower first punch 9 fitted in the die 8 so as to be vertically slidable, A lower second punch 10 fitted in the lower first punch 9 so as to be vertically slidable,
A core rod (not shown) fitted in the lower second punch 10 and integrated with the die 8 and an upper punch (fitted in the die 8 so as to be insertable into and removable from the top and slidable in the vertical direction). (Not shown). In particular, the lower first punch 9 forms the lower end surface of the gear portion 2 of the green compact 1 and the outer peripheral surface of the boss portion 3. Also, lower second punch 10
Forms the lower end surface of the boss portion 3. And
When pulling out, first the lower first punch 9 and the lower second punch 9
The die 10 is lowered while the die 10 is still integrated, and the gear portion 2 is pulled out from the die 8 by the lower first punch 9 and the lower second punch 10. Then, the lower first punch 9 also starts descending, and the boss portion 3 is extracted from the lower first punch 9 by the lower second punch 10. At this time, at the time of subsequent payout, the green compact 1 is moved to the lower first
The lower first punch 9 is relatively raised until the upper end of the lower second punch 10 is positioned above the upper end surface of the die 8 so as not to be caught by the punch 9 and the die 8. 1 Punch 9 is relatively elevated until it is located above the upper end surface. Therefore, if a box-shaped feeder (not shown) is slid forward on the die plate 7 and the die 8, the feeder will be caught by the lower first punch 9 and the lower second punch 10 to perform the payout. Absent. Therefore, it is conceivable to fix the jig that fits the shape of the green compact 1 on the front surface of the feeder above the lower surface thereof, but nevertheless, the green compact placed on the lower second punch 10 may be fixed. When 1 moves onto die plate 7 or die 8,
There is a risk that the green compact 1 may be damaged by being impacted by falling over.

Further, for example, in Japanese Patent Laid-Open No. 2-282403,
There is described a dispensing device provided with a pair of arms that are opened and closed in front of the feeder in conjunction with the forward / backward movement of the feeder and the vertical movement of the upper punch. In this method, the extracted green compact is gripped by a pair of arms, carried forward, and released. However, this device also merely moves the powder compact horizontally when held by the arm. Therefore, in the case as shown in FIG. 13, when the moved powder compact is released from the arm, The powder may fall and be impacted. In addition, the structure is complicated and malfunctions easily occur.

[0006]

As described above, when the powder compact having the boss portion, which is the small diameter portion, is extracted below the gear portion, which is the large diameter portion, the lower punch projects from the upper surface of the die. In the powder molding press described above, the powder compact cannot be discharged without fear of damage only by pushing the powder compact with the advancing feeder or the jig fixed to the front surface thereof. Also,
For example, as described in Japanese Unexamined Patent Publication No. 2-282403, even if a dispensing device provided with a pair of arms on the front side of the feeder, which opens and closes in conjunction with the forward and backward movement of this feeder and the vertical movement of the upper punch, When the powder compact that has been moved to is released from the arm, the powder compact may fall and receive an impact, and the structure is complicated and malfunction may easily occur.

The present invention is intended to solve such a problem, and when a powder compact having a small diameter portion on the lower side of the large diameter portion is extracted, the lower punch projects above the die. It is an object of the present invention to provide a powder compacting device that can dispense a powder compact without fear of damage in a powder molding press, has a simple structure, and operates reliably.

[0008]

In order to achieve the above object, a die fixed to a die plate, an upper punch which is slidably fitted in the die vertically, and A molding die for molding a green compact having a small diameter portion having a smaller diameter on the lower side of the large diameter portion and a lower punch, and a raw material powder in the die by sliding in the front-back direction on the die and die plate. In a powder molding press, which has a feeder for supplying, and a lower punch projects from the upper surface of the die to eject the compact compact formed from the die, the compact compact thus extracted is interlocked with the feeder. In a powder compact dispensing device for dispensing from a die and a die plate, a primary dispenser that is vertically movably supported on the front side of the feeder and surrounds a small diameter part of the green compact from the rear and has a large diameter part mounted thereon. A spring that biases the primary dispensing body upward The when the feeder provided in the die plate is advanced to the front than the first
A retainer that engages with the next payout body to lower the primary payout body, a secondary payout body that is vertically movable on the front side of the feeder, and a cam follower fixed to this secondary payout body. And a cam that is provided on the die plate, the cam follower passes through the lower side when the feeder moves forward, and the cam follower passes through the upper side when the feeder moves backward, and the secondary payout body is positioned in front of the primary payout body. And an extruding part that is fixed and pushes the green compact forward.

In order to achieve the same object, a second aspect of the present invention provides a die fixed to a die plate, and an upper punch and a lower punch that are slidably fitted in the die vertically. A molding die for molding a green compact having a small diameter portion with a smaller diameter on the lower side of the large diameter portion, and a feeder that slides forward and backward on the die and die plate to supply the raw material powder into the die. And a lower punch protruding from the upper surface of the die to eject the green compact formed from the die. The powder compacting press is provided with the die and the die plate in association with the feeder. In a powder compact dispensing device for dispensing from above, a primary dispenser fixed to the front side of the feeder, enclosing a small diameter part of the compact from the rear and having a large diameter part mounted thereon, and a primary dispenser located in front of the die. And below the trajectory of the primary dispenser And gentle ridges in the front-rear direction provided to the die plate and location, and a secondary payout body that is vertically movably supported on the front side of the feeder, the 2
A cam follower fixed to the next payout body, a cam provided on the die plate, the cam follower passes through the lower side when the feeder moves forward, and the cam follower passes through the upper side when the feeder moves backward, and the cam follower moves forward of the primary payout body. And an extruding part which is fixed to the secondary dispensing body and pushes the green compact forward.

[0010]

In the powder compacting device for powder compacting press according to the first aspect of the present invention, the lower punch projects from the upper surface of the die and the compacted powder compact is extracted from the die. As it moves forward, the primary delivery body on the front side of the feeder surrounds the small diameter portion of the green compact from the rear and starts pushing the green compact forward. After that, as the lower punch descends with respect to the die, or as the green compact separates from the lower punch, the large diameter portion of the green compact is placed on the primary dispensing body. After the green compact has separated from the lower punch, as the feeder advances, the retainer provided on the die plate engages with the primary dispensing body, and the primary dispensing body resists the bias of the spring. And lower it. Along with this, the green compact is placed on the die plate, and the primary delivery body is separated from the large diameter portion of the green compact. Therefore, even if the primary dispensing body then moves backward together with the feeder, the green compact stops. In addition, when the presser tool is disengaged from the primary dispensing body as the feeder retracts, the primary dispensing body rises again due to the bias of the spring.
Next, when the feeder moves forward, the green compact discharged by the primary dispensing body as described above is further pushed forward by the extruding portion located in front of the primary dispensing body in the secondary dispensing body. Move to. The secondary payout body is
At the time of forward movement, the cam follower fixed to this secondary payout body goes down by passing under the cam provided on the die plate, but at the time of backward movement, it goes up by passing the cam follower over the upper side of the cam, The extruded part passes above the green compact and does not interfere with the green compact.

Further, in the green compact dispensing device for the powder compacting press according to the second aspect of the present invention, as in the case of the 1 in front of the feeder.
The next delivery body surrounds the small diameter part of the green compact from the back, and after pushing the green compact forward, as the lower punch descends with respect to the die, or As it moves away from the top, the large diameter part of the green compact is placed on the primary dispensing body. After the green compact is separated from the lower punch, the green compact gently rests on the ridges on the die plate and rises with respect to the primary dispensing body as the feeder advances. Separates from the large diameter part of the green compact. Therefore, even if the primary payout body then moves backward together with the feeder, the green compact remains on the mountain portion. The green compact dispensed by the primary dispenser in this way is also dispensed further forward by the secondary dispenser when the feeder next advances.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the powder compacting device for a powder molding press of the present invention will be described below with reference to FIGS. The green compact 11 serves as an inner rotor of an internal gear pump, has a substantially annular shape, and has a smaller outer diameter on the lower side of the gear portion 12 as a large diameter portion having teeth on the outer circumference. A boss portion 13 as a small portion is provided coaxially.

Molding die for molding the green compact 11
Reference numeral 16 denotes a cylindrical die 18 fixed to a die plate 17, a lower first punch 19 which is a cylindrical lower punch fitted in the die 18 in a vertically slidable manner, and the lower first punch. A lower second punch 20 which is a cylindrical lower punch fitted in 19 so as to be slidable up and down, a core rod 21 fitted in the lower second punch 20 and integral with the die 18, and the die 18 An upper punch (22) is fitted therein so that the upper punch (22) can be inserted and removed from the upper side and slidable vertically. The die 18 forms the outer peripheral surface of the gear portion 12 of the green compact 11, and the upper end surface thereof is flush with the upper surface of the die plate 17. The lower first punch 19 forms the lower end surface of the gear portion 12 of the green compact 11 and the outer peripheral surface of the boss portion 13. The lower second punch 20 forms the lower end surface of the boss portion 13. The core rod 21 forms the inner peripheral surface of the green compact 11. The upper punch 22 forms the upper end surface of the green compact 11. Especially, when the green compact 11 is removed after molding, the upper end of the lower first punch 19 is
The lower second punch 20 is positioned so as to project from the upper surface of the lower 18, and the upper end of the lower second punch 20 is positioned to project from the upper end of the lower first punch 19. A chute 23 for a deburring machine or the like is provided in front of the die plate 17.

26 is a feeder, and this feeder 26 is
It has a box-like shape with an open bottom surface, and slides on the die 18 and the die plate 17 in the front-rear direction to supply the raw material powder into the die 18. Then, levers 28 are engaged with pins 27 protruding from both side surfaces of the feeder 26, respectively. In this way, the power is transmitted from the main shaft of the powder molding press main body to the feeder 26 via the cam and the lever 28, and the feeder 26 moves back and forth in synchronization with the operation of the mold 16. Furthermore, on the upper rear part of the feeder 26,
A hose 29 from a hopper (not shown) for containing the raw material powder is connected.

Next, the structure of the powder compact dispenser 31 for dispensing the powder compact 11 discharged upward from the die 18 in cooperation with the feeder 26 from the die 18 and the die plate 17 will be described. On the front side of the feeder 26, a substantially horizontal plate-shaped primary dispensing body 32 is supported at its rear end by a spindle 33. That is, the primary dispensing body 32 swings up and down within a predetermined range with the horizontal direction as the rotation axis direction. The front part of the primary dispensing body 32 is located above the upper end surface of the lower second punch 20 located at the rising limit of the die 18 in the ascending limit of the primary dispensing body 32, and below this. Gear part 12 of green compact 11 placed on second punch 20
Is located below the lower surface of the. At the same time, the primary dispensing body 32 is constantly urged upward by the coil spring 34 stretched between the primary dispensing body 32 and the feeder 26. The primary payout body 32 has a substantially U-shape that opens forward, and is a boss portion of the green compact 11.
The gear portion 12 is mounted while surrounding 13 later.
Further, a pressing member 36 is provided on the die plate 17 so as to be separated from the die 18 by at least the diameter of the green compact 11 or more. A front portion of the presser tool 36 is fixed to the die plate 17, and a rear portion of the retainer 36 floats above the die plate 17. The rear end portion of the presser foot 36 is an introduction portion 37 that is inclined in a direction that rises rearward.
The upper end of 37 is located slightly higher than the rear end of the primary dispensing body 32 in the ascending limit. At the same time, the front side of the introduction portion 37 of the holding tool 36 is a holding portion 38 having a gap between the upper surface of the die plate 17 and the thickness of the primary dispensing body 32. In this way, the pressing tool 36 engages with the upper side of the primary dispensing body 32 that has advanced together with the feeder 26, and lowers the primary dispensing body 32.

Further, on the front side of the feeder 26, 2
The next payout body 41 is also supported by the support shaft 42 at its rear end. The secondary payout body 41 swings up and down with the horizontal direction as the rotation axis direction. The secondary dispensing body 41 has a frame shape, and an extruding portion 43 that pushes the green compact 11 forward is fixed to the front portion. The push-out portion 43 is separated from the primary delivery body 32 by at least the diameter of the green compact 11 or more. Further, a pin-shaped cam follower 44 is fixed to the front portion of the side surface of the secondary payout body 41. Further, a lane plate 45 on which the cam follower 44 slides on the horizontal upper surface is fixed on the die plate 17. A fixed cam 47, which slides on the horizontal upper surface of the cam follower 44, is fixed to the side surface of the wall plate 46 fixed on the lane plate 45, and is movable in front of the fixed cam 47. The cam 48 is supported by the support shaft 49. This movable cam 48 swings with the left-right direction as the rotation axis direction,
The support shaft 49 side is positioned so as to be always connected to the fixed cam 47, and is inclined so that the front end contacts the lane plate 45 at the lower limit position. The movable cam 48 is constantly urged downward by a coil spring 52 stretched between a lever 50 fixed to a support shaft 49 integral with the movable cam 48 and a rod 51 standing on the lane plate 45. Has been done. Thus, the cam follower 44 slides on the lane plate 45 below the cams 47 and 48 when the feeder 26 moves forward, and slides on the cams 47 and 48 when the feeder 26 moves backward. , Feeder
At the time of forward movement of 26, while the secondary payout body 41 is lowered,
When the feeder 26 is retracted, the secondary payout body 41 is located in a raised position, and its extruding portion 43 is located higher than the green compact 11 on the die plate 17. The extruding section 43 is provided with a sensor 56 that detects the presence or absence of the green compact 11. The sensor 56 has a contact 57 that contacts the green compact 11 from above.

Next, the operation of the above configuration will be described. At the time of molding, as shown in FIGS. 4 and 5, first, the feeder 26 moves forward and is positioned above the die 18, and the raw material powder is supplied from the feeder 26 into the die 18.
After that, the feeder 26 retracts, and as shown in FIG.
Inside the next delivery body 41, the primary delivery body 32 and the pushing portion
The die 18 is located between the two. In this state, the descending upper punch 22 is fitted in the die 18 and presses the raw material powder in the die 18 from above. Then, the die 18 and the lower first punch 19 descend, and after the lower first punch 19 stops,
18 continues to descend, lower first punch 19 and lower second punch 20
Presses the raw material powder from below to form the green compact 11.
After that, the upper punch 22 rises and comes out of the die 18, and the lower first punch 19 continues to descend while the lower first punch 19 is stopped, so that the lower first punch 19 and the lower second punch 19 first.
It is pushed up by 20 and the gear portion 12 of the green compact 11 is pulled out from the die 18. Then, the lower first punch 19 also starts descending together with the die 18, so that it is pushed up by the lower second punch 20 and the boss portion 13 of the green compact 11 is extracted from the lower first punch 19. When the extraction is completed, the upper end of the lower first punch 19 is positioned slightly above the upper end surface of the die 18, and the lower second punch 20 has the upper end thereof as shown in FIG.
It is located slightly above the upper end surface of 19. Thereafter, the die 18 and the lower first punch 19 also start to rise, and after the lower first punch 19 is stopped, the die 18 further rises. Also, the feeder 26
Moves forward again for the above-mentioned powder feeding, but with this, the green compact 11 is discharged from the die 18 and the die plate 17 as described in detail below. The above steps are repeated, and the green compacts 11 are molded one by one.

Next, the payout will be described by focusing on one green compact 11. Feeder from the backward limit
With advancement of 26, first, the primary delivery body 32 surrounds the boss portion 13 of the green compact 11 from behind, and starts pushing the green compact 11 forward. Then, as the die 18 rises, or as the green compact 11 moves away from the lower second punch 20,
As shown in FIG. 4, the green compact 11 is slightly lowered and its gear part
12 is placed on the primary payout body 32. The green compact 11 is the lower first punch
19 After separating from the top, presser foot
36 engages on the primary dispensing body 32 from the front. The primary dispensing body 32 is guided by the introduction portion 37 of the presser foot 36 and gradually descends against the urging force of the spring 34. Kept in. As the primary dispensing body 32 descends, the green compact 11 is gently placed on the die plate 17, and the primary dispensing body 32 moves downward from the gear portion 12 of the green compact 11. Finally, the green compact 11 is conveyed to the position indicated by a on the die plate 17 by the primary dispensing body 32. After that, the feeder 26 retreats, but at this time, the primary dispensing body 32 is held down by the pressing tool 36 for a while. Therefore, the primary dispenser
The green compact 11 does not adhere to the 32, the green compact 11 stops at the position a, and the primary dispensing body 32 is the boss portion 13 of the green compact 11.
Get out of. In addition, as the feeder 26 moves backward,
When 36 is disengaged from the primary dispensing body 32, the primary dispensing body 32 rises again due to the bias of the spring 34. Next feeder
When 26 moves forward, the green compact 11 at the position a is pushed by the pushing portion 43 of the secondary dispensing body 41 and conveyed further forward as shown in FIGS. 4 and 5, and is thrown into the chute 23. It In this way, one green compact 11 is discharged in two stages. Further, when the feeder 26 moves forward once, the two green compacts 11 are simultaneously conveyed.

By the way, when the feeder 26 moves forward from the backward limit, as shown in FIG. 7A, the cam follower 44 of the secondary payout body 41 slides on the lane plate 45, and the cams 47,
Pass underneath 48. Therefore, the secondary dispensing body 41 is lowered by its own weight, and the extruding portion 43 of the secondary dispensing body 41 dispenses the green compact 11 forward as described above. When the cam follower 44 passes under the movable cam 48, the movable cam 48 rises against the urging force of the spring 52.
As shown by the chain line in FIG. 7A, the robot immediately descends until the front end contacts the lane plate 45. Then,
The feeder 26 retreats from the forward limit, but at this time,
As shown in FIG. 7B, the cam follower 44 moves from the lane plate 45 to the movable cam 48 and slides on the cams 47 and 48. In this way, when the feeder 26 is retracted, the cam follower 44 is placed on the cams 47 and 48, so that the secondary payout body 41 is raised and the push-out portion 43 thereof is moved as shown in FIG.
Passes over the green compact 11 at the position a. That is, when the feeder 26 is retracted, the extruding section 43 causes the green compact 11 to move.
Therefore, the green compact 11 conveyed to the position a will not be pulled back. When the cam follower 44 passes through the fixed cam 47 backward, it falls and returns to the lane plate 45.

As described above, according to the structure of the dispensing device 31, when the green compact 11 having the boss portion 13 is extracted, the lower first punch 19 projects from the upper end surface of the die 18 and the lower second punch 20. In the powder molding press in which the upper end surface of the lower first punch 19 protrudes, a substantially U-shaped 1 is formed in front of the feeder 26.
The secondary payout body 32 is provided so as to be vertically movable, is biased upward by a spring 34, and is engaged with the die plate 17 on the advancing primary payout body 32 to push down the primary payout body 32. By providing the retainer 36, the green compact 11 can be reliably discharged without fear of damage. That is, the boss portion 13 of the extracted green compact 11 is surrounded by the primary payout body 32 later, and then the gear portion of the green compact 11 is placed on the primary payout body 32.
The powder compact 11 is conveyed forward with 12 placed thereon, and the primary dispensing body 32 is further pushed down by the pressing tool 36 to gently land the powder compact 11 on the die plate 17, and thereafter the feeder. Since the green compact 11 does not follow the primary payout body 32 when the 26 is retracted, the green compact 11 can be reliably discharged without fear of damage. And in this way primary dispenser
The green compact 11 delivered by 32 can be delivered up to the chute 23 by the secondary delivery body 41 whose height is controlled by the cams 47 and 48. Moreover, the payout device 31 has a simple structure and can be operated reliably.

Next, a second embodiment of the powder compacting device of the powder molding press of the present invention will be described with reference to FIGS. 8 to 12. Since the green compact 11, the molding die 16 and the feeder 26 have substantially the same configuration as that of the first embodiment, the corresponding parts are designated by the same reference numerals and their description is omitted. Omit it. However, a horizontal extension table 60 is interposed between the die plate 17 and the chute 23. In the powder compacting device 61, the feeder
A plate-shaped primary dispensing body 62 is horizontally fixed to the front surface of 26. The primary dispensing body 62 is above the upper end surface of the lower second punch 20 located at the upper limit of the die 18, and is the gear portion of the green compact 11 placed on the lower second punch 20. 12
Is located below the lower surface of the. The primary dispensing body 62 has a substantially U-shape that opens forward, surrounds the boss portion 13 of the green compact 11 from the rear, and mounts the gear portion 12 thereon. Further, a powder compact lane plate 63 is fixed on the die plate 17 and the extension table 60 located in front of the die 18. That is, the green compact lane plate 63 has the upper surface of the green compact 11 ejected.
Is sliding forward. Further, the rear part of the green compact lane plate 63 is a mountain part 64 that is inclined so that the skirt on the rear side gradually rises toward the front. The height of the mountain portion 64 is lower than the height of the lower surface of the primary dispensing body 62, and the height of the boss portion 13 of the green compact 11 is subtracted from the height of the upper surface of the primary dispensing body 62. It is higher than the value.

Further, the front side of the feeder 26 has 2
The next payout body 71 is also supported by the support shaft 72 at its rear end. The secondary dispensing body 71 swings up and down with the horizontal direction as the rotation axis direction. The secondary dispensing body 71 has a frame shape, and a pair of front and rear extruding portions 73 and 74 for pushing the green compact 11 forward are fixed to the front portion. The rear extruding section 73 is separated from the primary dispensing body 62 by at least the diameter of the green compact 11 or more, and the front extruding section 74 is at least forward of the rear extruding section 73. The diameter is more than the diameter of the green compact 11. And the secondary payout body 71
Is the secondary dispensing body as in the first embodiment.
A cam follower 76 fixed to 71, a lane plate 77, a wall plate 78, a fixed cam 79, a movable cam 80, a support shaft 81, a lever 82, a rod 83 and a coil spring 84 provided on the die plate 17.
Thus, when the feeder 26 is moved forward, the feeder 26 is lowered, while when the feeder 26 is retracted, the feeder 26 is raised and the extruded portions 73 and 74 are positioned higher than the green compact 11 on the green compact lane plate 63. It is like this. A sensor 86 that detects the presence or absence of the green compact 11 is provided in the rear extrusion unit 73. The sensor 86 has a contactor 87 that contacts the green compact 11 from above.

Next, the operation of the above configuration will be described. At the time of molding, when the upper punch 22 is fitted in the die 18, the die 18 is located inside the secondary dispensing body 71 and between the primary dispensing body 62 and the rear extruding portion 73. When the molded green compact 11 is extracted, as shown in FIG. 9, the upper end of the lower first punch 19 is finally located slightly above the upper end surface of the die 18, and the lower second punch 20 is The upper end thereof is located slightly above the upper end surface of the lower first punch 19. Then, the primary dispensing body 62 that advances together with the feeder 26 surrounds the boss portion 13 of the green compact 11 from the rear side, and the green compact 11
Start pushing forward. Thereafter, as the die 18 rises or the green compact 11 moves away from the lower second punch 20, as shown in FIG. Are placed on the primary dispensing body 62. Then, after passing over the die 18, the green compact 11 is gently placed on the mountain portion 64 of the green compact lane plate 63 as the feeder 26 advances. Along with that, the green compact 11 rises with respect to the primary dispensing body 62, so that the primary dispensing body 62 moves to the gear portion 12 of the green compact 11.
Away from. As shown in FIG. 11, finally, the green compact 11 is conveyed to the position indicated by a on the mountain portion 64 by the primary dispensing body 62. After that, the feeder 26 retreats, but at this time, as described above, since the primary dispensing body 62 is separated from the gear portion 12 of the green compact 11 downward,
The green compact 11 does not adhere to the secondary delivery body 62, the green powder 11 stops at the position a, and the primary delivery body 62 includes the green compact 11.
Get out of the boss 13 of. Next, when the feeder 26 moves forward, the green compact 11 at the position a is pushed by the extruding portion 73 on the rear side of the secondary dispensing body 71 and conveyed further forward, as shown in FIGS. 10 and 11. , To the position indicated by b on the green compact lane plate 63. Next, when the feeder 26 moves forward, the green compact 11 at the position b is pushed by the push-out portion 74 on the front side of the secondary dispensing body 71, is further conveyed to the front, and is thrown into the chute 23. Thus one green compact
11 is paid out in three stages. Further, when the feeder 26 moves forward once, the three green compacts 11 are simultaneously conveyed. When the feeder 26 moves forward, the cam follower 76 slides on the lane plate 77 and passes under the cams 79 and 80, so that the secondary dispensing body 71 is lowered by its own weight.
The extruding portions 73 and 74 of the secondary delivery body 71 deliver the green compact 11 forward as described above. Meanwhile, feeder 26
As the cam follower 76 slides on the cams 47 and 48 when the robot moves backward, as shown in FIG.
Ascending, the extruded portions 73 and 74 pass above the green compact 11 at the a and b positions. That is, when the feeder 26 retracts, the extruding portions 73 and 74 do not interfere with the green compact 11,
The green compact 11 conveyed to the a and b positions will not be pulled back.

As described above, according to the structure of the dispensing device 61, when the powder compact 11 having the boss portion 13 is extracted, the lower first punch 19 projects from the upper end surface of the die 18, and the lower second punch 20. In the powder molding press in which is protruded from the upper end surface of the lower first punch 19, a substantially U-shaped primary dispensing body 62 is fixed to the front side of the feeder 26, and a mountain portion 64 is provided on the die plate 17. Thus, the green compact 11 can be reliably discharged without fear of damage. That is, the boss portion 13 of the extracted green compact 11 is surrounded by the primary payout body 62 afterwards, and then,
With the gear portion 12 of the green compact 11 placed on the primary delivery body 62, the green compact 11 is conveyed forward and gently landed on the mountain portion 64, and the feeder 26 is subsequently retracted. Sometimes green compact
Since 11 does not follow the primary dispensing body 62, the green compact 11 can be reliably dispensed without fear of damage. The green compact 11 thus dispensed by the primary dispensing body 62 can be further dispensed to the chute 23 by the secondary dispensing body 71 whose height is controlled by the cams 79 and 80. Moreover, the dispensing device 61 has a simple structure, and its operation can be ensured.

By the way, in the second embodiment, the green compact 11 is used.
Is delivered in three stages, because the green compact 11 itself is large,
This is because the distance from the center of the die 18 to the chute 23 is larger than the stroke of the feeder 26 due to the size of the mold 16 being large or other reasons.

The present invention is not limited to the above embodiment, and various modifications can be made. For example,
In the above embodiment, the green compact 11 was the inner rotor for the internal gear pump, but of course the invention is not limited to this. Further, the structure of the molding die is not limited to that of the above embodiment. For example, although the lower punch is double in the die 16 of the above-described embodiment, it may be single.

[0027]

According to the invention of claim 1, there is provided a powder molding press in which the lower punch projects from the upper surface of the die when a compact having a small diameter portion on the lower side of the large diameter portion is extracted. The green compact dispensing device includes a primary dispensing body that is movably supported on the front side of a feeder and surrounds a small diameter portion of the green compact from the rear and has a large diameter portion, and a spring that biases this upward. A retainer that engages with and lowers the primary payout body when the feeder moves forward, a secondary payout body that is vertically movable on the front side of the feeder, a cam follower fixed to this, and a feeder. Since the cam follower passes through the lower side when moving forward and the upper side moves when moving backward, the cam follower is provided in front of the primary payout body and the pushing portion fixed to the secondary payout body is provided. Place the green compact on the primary dispenser and convey it to the front After, lowering the primary dispensing body is landed green compact, and then retracting the primary dispensing body, further,
By discharging the green compact by the secondary payout body, the green compact can be surely discharged without fear of damage, and the structure of the green compact discharging device is simple and its operation is reliable. it can.

According to the second aspect of the invention, the primary dispensing body is fixed to the feeder, and a gentle mountain portion is provided on the die plate in the front-rear direction and located below the locus of the primary dispensing body. Therefore, the green compact on the lower punch is placed on the primary dispensing body and conveyed forward, and the green compact is landed on the mountain portion, and then the primary dispensing body is retracted to remove the green compact. It can be delivered reliably without fear of damage, and
The green powder dispenser has a simple structure and its operation can be ensured.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a powder compacting device for a powder molding press of the present invention.

FIG. 2 is a cross-sectional view illustrating the same operation.

FIG. 3 is a cross-sectional view illustrating the same operation.

FIG. 4 is a cross-sectional view explaining the same operation.

FIG. 5 is a cross-sectional view illustrating the same operation.

FIG. 6 is a cross-sectional view illustrating the same operation.

FIG. 7 is a side view for explaining the operation of the same cam and cam follower.

FIG. 8 is a perspective view showing a second embodiment of the powder compacting device of the powder molding press of the present invention.

FIG. 9 is a cross-sectional view explaining the same operation.

FIG. 10 is a cross-sectional view illustrating the same operation.

FIG. 11 is a cross-sectional view illustrating the same operation.

FIG. 12 is a cross-sectional view illustrating the same operation.

FIG. 13 shows an example of a conventional powder molding press,
It is a sectional view of a part of molding die.

[Explanation of symbols]

 11 Green compact 12 Gear part (large diameter part) 13 Boss part (small diameter part) 16 Molding die 17 Die plate 18 Die 19 Lower first punch (lower punch) 20 Lower second punch (lower punch) 22 Upper Punch 26 Feeder 31 Powder discharging device 32 Primary discharging body 34 Spring 36 Presser tool 41 Secondary discharging body 43 Push-out section 44 Cam follower 47 Fixed cam (cam) 48 Movable cam (cam) 61 Powder discharging device 62 1 Next delivery body 64 Mountain portion 71 Secondary delivery body 73 Push-out portion 74 Push-out portion 76 Cam follower 79 Fixed cam (cam) 80 Movable cam (cam)

Claims (2)

[Claims] 1. A small diameter portion having a smaller diameter than a large diameter portion having a die fixed to a die plate and an upper punch and a lower punch which are slidably fitted in the die in the vertical direction. The die includes a molding die for molding a green compact and a feeder that slides on the die and the die plate in the front-back direction to supply the raw material powder into the die. The lower punch projects from the upper surface of the die. In a powder compacting press for ejecting a green compact molded from the above, in a green compact dispensing device that dispenses the green compact discharged from a die and a die plate in conjunction with the feeder, the front side of the feeder. Provided on the die plate, a primary dispensing body which is movably supported in the up and down direction and surrounds a small diameter portion of the green compact, and on which a large diameter portion is mounted, a spring for urging the primary dispensing body upward. The feeder is before the die And a pressing tool that engages with the primary dispensing body to move the primary dispensing body downward when it is advanced to one side, and is vertically movably supported on the front side of the feeder.
A secondary payout body, a cam follower fixed to the secondary payout body, a cam that is provided on the die plate, the cam follower passes through a lower side when the feeder moves forward, and the cam follower passes through an upper side when the feeder moves backward; A powder compacting device for a powder molding press, comprising: an extruding part that is located in front of the primary dispensing body and is fixed to the secondary dispensing body and pushes the compacted powder forward. 2. A small diameter part having a smaller diameter due to the lower side of the large diameter part having a die fixed to a die plate and an upper punch and a lower punch which are slidably fitted in the die in the vertical direction. The die includes a molding die for molding a green compact and a feeder that slides on the die and the die plate in the front-back direction to supply the raw material powder into the die. The lower punch projects from the upper surface of the die. In a powder compacting press for ejecting a green compact molded from the above, in a green compact dispensing device that dispenses the green compact discharged from a die and a die plate in conjunction with the feeder, the front side of the feeder. A primary dispensing body which is fixed to the rear of the die and surrounds a small diameter portion of the green compact, and on which a large diameter portion is mounted, and a die plate which is located in front of the die and below the trajectory of the primary dispensing body. In the front-back direction provided above A gentle mountain portion, a secondary payout body supported on the front side of the feeder so as to be vertically movable, a cam follower fixed to the secondary payout body, the cam provided on the die plate when the feeder advances, The follower passed through the lower side, and the cam follower passed through the upper side at the time of retreating. The cam was provided with an extruding portion which was positioned in front of the primary dispensing body and which was fixed to the secondary dispensing body and pushed the green compact forward. A powder compacting device for powder compacting press.