JP2932466B2 - Compacting device for powder molding press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for discharging a green compact of a powder molding press used in powder metallurgy.

[0002]

2. Description of the Related Art In powder metallurgy, a raw material powder is compressed by a powder forming 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 molding die having a die, an upper punch and a lower punch which are slidably fitted in the die in a vertical direction, and the die and a die to which the die is fixed. It has a feeder that moves back and forth on the plate and supplies the raw material powder into the die. Then, at the time of molding, the feeder is first positioned above the die, and the raw material powder is supplied into the die from the feeder. Then
After the feeder retreats from above the die, the descending upper punch fits into the die, pressurizes the raw material powder in this die from above, and, for example, when the die descends, the lower punch lowers the raw material powder. To form a green compact. Then, as the upper punch rises and comes out of the die, and the die further descends, the lower punch pushes up the green compact and the green compact is pulled out of the die. Next, 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 is injected into, for example, a chute to a deburring machine or the like.

[0003] By the way, the green compact before sintering is naturally brittle and must be handled carefully. As described above, if you discharge the compact after molding with a feeder,
This dispensing can be automated, but depending on the shape of the compact, etc., it is impossible to dispense the compact by simply pushing the compact directly forward with the flat front surface of the box-shaped feeder. Or the compact may be damaged. In addition, especially when the compact is large, the mold itself becomes large, so that the stroke of the feeder may not be enough to discharge the compact to the chute outside the die plate. Therefore, by hand
Although the green compact after molding is also taken out, of course, the efficiency is poor.

As a case where the dispensing is not successful simply by pushing the sheet forward by the feeder, there is a case as shown in FIG. 3, for example. The compact 1 shown in FIG. 3 has a substantially annular shape, and a boss 3 having a smaller outer diameter is coaxially provided below the gear 2. And
A mold 6 for molding the green compact 1 includes a cylindrical die 8 fixed to a die plate 7, a lower first punch 9 slidably fitted in the die 8, and a first punch 9. A lower second punch 10 fitted slidably up and down in the lower first punch 9;
A core rod (not shown) fitted into the lower second punch 10 and integral with the die 8 and an upper punch (not shown) fitted into the die 8 so as to be removably inserted and slidable up and down. (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, the lower second punch 10
Forms the lower end surface of the boss 3. And
At the time of removal, first, the lower first punch 9 and the lower second punch 9
The die 8 descends while the unit 10 remains integral, and the gear portion 2 is pulled out of the die 8 by the lower first punch 9 and the lower second punch 10. Then, the lower first punch 9 also starts to descend, and the boss 3 is pulled out from the lower first punch 9 by the lower second punch 10. At this time, at the time of subsequent dispensing, the green compact 1
The lower first punch 9 is relatively raised until the upper end thereof is located above the upper end surface of the die 8 so as not to be caught by the punch 9 and the die 8. It relatively rises until it is located above the upper end face of one punch 9. Therefore, if a box-shaped feeder (not shown) is simply slid forward on the die plate 7 and the die 8, the feeder is caught by the lower first punch 9 and the lower second punch 10 to perform payout. Absent. Therefore, it is conceivable to fix a jig suitable for the shape of the green compact 1 on the front surface of the feeder above the lower surface thereof. When 1 moves onto die plate 7 or die 8,
There is a possibility that the green compact 1 may be damaged due to an impact such as falling down.

[0005] For example, Japanese Patent Laid-Open No. 2-282403 discloses that
A dispensing device is described in which a pair of arms that are opened and closed in front of the feeder in conjunction with the forward and backward movement of the feeder and the up and down movement of an upper punch are described. In this method, the extracted compact is gripped by a pair of arms, carried forward, and released. However, this device also simply moves the green compact horizontally when held by the arm. In this case, when the moved green compact is released from the arm, as shown in FIG. The powder may fall and receive an impact. Further, the structure is complicated, and malfunctions are likely to occur.

[0006]

As described above, when a green compact having a small diameter boss portion is extracted below a large diameter gear portion, the lower punch projects from the upper surface of the die. In such a powder compacting press, the green compact cannot be dispensed without fear of damage only by pressing the green compact with the advancing feeder or a jig fixed to the front surface thereof. Also,
For example, as described in Japanese Patent Application Laid-Open No. 2-282403, even when using a dispensing device provided with a pair of arms that open and close in front of the feeder in conjunction with forward and backward movement of the feeder and up and down movement of the upper punch, When the compact that has been moved to is released from the arm, the compact may fall and receive an impact, and the structure is complicated, and there is a problem that malfunctions are likely to occur.

The present invention is intended to solve such a problem. When a green compact having a small-diameter portion below a 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 capable of dispensing a compact in a powder molding press without fear of damage, and having a simple structure and a reliable operation.

[0008]

According to a first aspect of the present invention, there is provided a die fixed to a die plate, and an upper punch slidably fitted in the die in a vertical direction. A molding die having a lower punch and a compact having a small diameter portion having a smaller diameter than a large diameter portion, and a raw material powder which is slid in a die and a die plate in the front-rear direction to be placed in the die. And a feeder for supplying the same, and the lower punch protrudes from the upper surface of the die to extract a green compact molded from the die, and the extracted green compact is interlocked with the feeder. In a green compact discharging apparatus for discharging from a die and a die plate, a primary discharging body which is supported on the front side of the feeder so as to be vertically movable and surrounds a small diameter portion of the green compact from behind and a large diameter portion is placed thereon, Spring for urging primary dispensing body upward The when the feeder provided in the die plate is advanced to the front than the first
A presser which engages on the next dispensing member to lower the primary dispensing member, a secondary dispensing member movably supported on the front side of the feeder, and a cam follower fixed to the secondary dispensing member And a cam provided on the die plate, wherein the cam follower passes through the lower side when the feeder advances, and the cam follower passes through the upper side when the feeder retreats, and the secondary dispensing body is located forward of the primary dispensing body. And an extruding portion which is fixed and pushes the green compact forward.

According to a second aspect of the present invention, in order to achieve the same object, a die fixed to a die plate and an upper punch and a lower punch slidably fitted in the die in a vertical direction. A molding die for molding a compact having a small diameter portion having a smaller diameter than a lower portion having a large diameter portion, and a feeder that supplies raw material powder into the die by sliding in a front-rear direction on a die and a die plate. In a powder forming press in which a lower punch projects from the upper surface of the die to extract a green compact formed from the die, the extracted green compact is linked with the feeder to a die and a die plate. In the green compact discharging device for discharging from above, a primary discharging body fixed to the front side of the feeder and surrounding the small diameter portion of the green compact from behind and having the large diameter portion mounted thereon, and located forward of the die. And below the trajectory of the primary payout body 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 dispensing body, a cam provided on the die plate, the cam follower passing below when the feeder advances, and the cam follower passing above when retreating, ahead of the primary dispensing body And an extruding section fixed to the secondary dispensing body and pushing the green compact forward.

[0010]

In the powder compacting device of the first aspect of the present invention, the lower punch projects from the upper surface of the die, and the formed compact is pulled out of the die. The feeder moves forward, and the primary dispensing body on the front side of the feeder surrounds the small diameter portion of the green compact from behind, and starts pushing the green compact forward. Thereafter, as the lower punch descends with respect to the die, or as the green compact separates from above the lower punch, the large diameter portion of the green compact is placed on the primary dispensing body. After the green compact separates from above the lower punch, the presser provided on the die plate engages with the primary dispensing body as the feeder advances, and this primary dispensing body resists the bias of the spring. And lower it. Accordingly, the green compact is placed on the die plate, and the primary dispensing body is separated from the large diameter portion of the green compact. Therefore, even if the primary dispensing body subsequently moves backward with the feeder, the green compact stops. When the presser comes off the primary dispensing body with the retreat of the feeder, the primary dispensing body rises again by the bias of the spring.
Next, when the feeder moves forward, the green compact discharged by the primary dispensing member as described above is pushed by an extruding portion located in the secondary dispensing member and located forward of the primary dispensing member, and is further moved forward. Move to. In addition, the secondary payout body
At the time of forward movement, the cam follower fixed to the secondary dispensing body is lowered by passing under the cam provided on the die plate, but at the time of retreat, the cam follower is raised by passing over the cam, The extruder passes over the green compact and does not interfere with the green compact.

Further, in the green compact discharging apparatus for a powder molding press according to the second aspect of the present invention, the first compactor on the front side of the feeder is also provided.
After the next dispensing body surrounds the small diameter portion of the green compact from behind and starts to push this 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 separates from above the lower punch, as the feeder advances, the green compact gently rests on the crest on the die plate and rises with respect to the primary dispensing body, thereby increasing the primary dispensing body. Depart from the large diameter part of the green compact. Therefore, even if the primary dispensing body subsequently retreats together with the feeder, the green compact stays on the peak. The green compact discharged by the primary dispenser in this way is also discharged further forward by the secondary dispenser when the feeder advances next.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a green compact discharging apparatus for a powder molding press according to the present invention will be described with reference to FIGS. The compact 11 is to be an inner rotor of the internal gear pump, is substantially annular, and has a smaller outer diameter under the gear portion 12 as a large diameter portion having teeth on the outer periphery. The boss 13 as a small part is provided coaxially.

A 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 slidably in the die 18, and a lower first punch 19. A lower second punch 20 which is a cylindrical lower punch fitted slidably in the upper and lower portions 19; a core rod 21 fitted in the lower second punch 20 and integral with the die 18; And an upper punch 22 fitted thereinto so as to be able to be inserted and removed from above and to be slidable up and down. The die 18 forms the outer peripheral surface of the gear portion 12 of the green compact 11, and has an upper end surface that is the same horizontal plane as 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 13. The core rod 21 forms the inner peripheral surface of the green compact 11. The upper punch 22 forms an upper end surface of the green compact 11. In particular, when extracting the green compact 11 after molding, the upper end of the lower first punch 19 is
The upper end of the lower second punch 20 protrudes 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.

Reference numeral 26 denotes a feeder.
It has a box shape with an open lower surface, slides on the die 18 and the die plate 17 in the front-rear direction, and supplies the raw material powder into the die 18. Lever 28 is engaged with pins 27 projecting from both sides of feeder 26, respectively. In this manner, power is transmitted to the feeder 26 from the main shaft of the powder molding press body via the cam and the lever 28 and the like, and the feeder 26 moves back and forth in synchronization with the operation of the mold 16. In addition, on the upper rear of the feeder 26,
A hose 29 from a hopper (not shown) for charging the raw material powder is connected.

Next, the structure of the green compact discharging device 31 for discharging the green compact 11 pulled out from the die 18 upward from the die 18 and the die plate 17 in conjunction with the feeder 26 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 support shaft 33. That is, the primary dispensing body 32 swings up and down within a predetermined range with the left-right direction as the rotation axis direction. The front portion of the primary dispensing body 32 is located above the upper end surface of the lower second punch 20 located at the ascending limit with respect to the die 18 at the ascending limit of the primary dispensing body 32, and The gear portion 12 of the green compact 11 placed on the second punch 20
Are located below the lower surface of the. At the same time, the primary dispensing member 32 is constantly urged upward by a coil spring 34 stretched between the primary dispensing member 32 and the feeder 26. The primary dispensing body 32 has a substantially U-shape that opens forward, and the boss portion of the green compact 11 is formed.
The gear section 12 is mounted on the rear side while surrounding the rear section 13.
Further, on the die plate 17, a pressing member 36 is provided at a position away from the die 18 by at least the diameter of the green compact 11. The presser 36 has a front part fixed to the die plate 17 and a rear part floating above the die plate 17. A rear end portion of the holding member 36 is an introduction portion 37 inclined in a direction ascending rearward.
The upper end of 37 is located slightly higher than the rear end of the primary dispensing body 32 at the ascending limit. At the same time, the front side of the introduction portion 37 of the holding member 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. Thus, the presser 36 engages with the upper side of the primary dispensing body 32 advanced with the feeder 26, and lowers the primary dispensing body 32.

Further, on the front side of the feeder 26, 2
The next dispensing body 41 is also supported by a support shaft 42 at its rear end. The secondary dispensing body 41 swings up and down with the left-right direction as the rotation axis direction. The secondary dispensing body 41 has a frame shape, and an extruding portion 43 for pushing the green compact 11 forward is fixed to a front portion. The extruded portion 43 is separated at least by the diameter of the green compact 11 in front of the primary dispensing body 32. In addition, a pin-shaped cam follower 44 is fixed to the front side of the secondary dispensing body 41. Further, a lane plate 45 on which the cam follower 44 slides on a horizontal upper surface is fixed on the die plate 17. On the side surface of the wall plate 46 fixed on the lane plate 45, a fixed cam 47 in which the cam follower 44 slides on a horizontal upper surface is fixed, and the cam follower 44 is movable in front of the fixed cam 47. A cam 48 is supported by a support shaft 49. The movable cam 48 swings with the left-right direction as the rotation axis direction.
The support shaft 49 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 integrated with the movable cam 48 and a rod 51 erected on the lane plate 45. Have been. 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 retreats. , Feeder
During the forward movement of 26, while the secondary payout body 41 is located down,
When the feeder 26 retreats, the secondary dispensing body 41 is positioned up, and its extruded portion 43 is positioned higher than the green compact 11 on the die plate 17. Note that a sensor 56 that detects the presence or absence of the green compact 11 is provided in the extruding unit 43. 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, first, as shown in FIGS. 4 and 5, 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.
Thereafter, the feeder 26 retreats, and as shown in FIG.
Inside the next dispensing body 41, the primary dispensing body 32 and the extruding portion
The die 18 is located between the die 18 and the die 43. In this state, the descending upper punch 22 fits into the die 18 and presses the raw material powder in the die 18 from above. Next, the die 18 and the lower first punch 19 descend, and after the lower first punch 19 stops, the die
18 continues to descend, the lower first punch 19 and the lower second punch 20
Presses the raw material powder from below, and the green compact 11 is formed.
Thereafter, the upper punch 22 rises and comes out of the die 18, and the die 18 continues to move down while the lower first punch 19 is stopped, so that the lower first punch 19 and the lower second punch 19 are stopped.
The gear portion 12 of the green compact 11 is pulled out from the die 18 by being pushed up by 20. Next, the lower first punch 19 also starts to descend together with the die 18, and is pushed up by the lower second punch 20, and the boss portion 13 of the green compact 11 is pulled out from the lower first punch 19. When the ejection is completed, as shown in FIG. 3, the upper end of the lower first punch 19 is located slightly above the upper end surface of the die 18, and the upper end of the lower second punch 20 has the lower first punch 19.
It is located slightly above the upper end face of 19. Thereafter, the die 18 and the lower first punch 19 also start to move upward, and after the lower first punch 19 stops, the die 18 further moves upward. Also, feeder 26
Moves forward again for the above-mentioned powder supply, and accordingly, 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 compact 11 is formed one after another.

Next, the dispensing will be described focusing on one compact 11 first. Feeder from retreat
With the advance of 26, first, the primary dispensing body 32 surrounds the boss portion 13 of the green compact 11 from behind, and starts pushing the green compact 11 forward. Thereafter, as the die 18 rises, or as the green compact 11 separates from above the lower second punch 20,
As shown in FIG. 4, the green compact 11 is slightly lowered to
12 is placed on the primary dispensing body 32. The green compact 11 is the lower first punch
19 After moving away from above, as the feeder 26 advances,
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 holding member 36 and gradually descends against the bias of the spring 34. After entering the lower part of the holding portion 38 of the holding member 36, the primary dispensing body 32 reaches the lower limit position. Is kept. 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 transported by the primary dispensing body 32 to a position indicated by a on the die plate 17. Thereafter, the feeder 26 starts to retreat. At this time, for a while, the primary dispensing body 32 is kept down by being pressed by the presser 36. Therefore, primary payout body
The compact 11 is not attached to the compact 32, and the compact 11 is stopped at the position a, and the primary dispensing body 32 is attached to the boss 13 of the compact 11.
Get out of. In addition, as the feeder 26 retreats,
When 36 comes off the primary dispensing body 32, the primary dispensing body 32 is raised again by the bias of the spring. Next, feeder
When the 26 advances, the green compact 11 at the a position is pushed by the pushing portion 43 of the secondary dispensing body 41 and further conveyed forward as shown in FIGS. You. Thus, one compact 11 is discharged in two stages. When the feeder 26 advances once, the two compacts 11 are conveyed simultaneously.

When the feeder 26 advances from the retreat limit, the cam follower 44 of the secondary dispensing body 41 slides on the lane plate 45 as shown in FIG.
Pass under 48. Accordingly, the secondary dispensing body 41 is lowered by its own weight, and the pushing portion 43 of the secondary dispensing body 41 pays out the green compact 11 as described above. When the cam follower 44 passes below the movable cam 48, the movable cam 48 rises against the bias of the spring 52, but when the cam follower 44 passes, the spring 52
As shown by the dashed line in FIG. 7A, the vehicle immediately descends until the front end contacts the lane plate 45. Then
The feeder 26 retreats from the forward limit,
As shown in FIG. 7B, the cam follower 44 moves onto the movable cam 48 from the lane plate 45 and slides on the cams 47, 48. As described above, when the feeder 26 retreats, the cam follower 44 rests on the cams 47 and 48, and as shown in FIG.
Passes above the compact 11 at the position a. That is, when the feeder 26 retreats, the extruding section 43
The compact 11 conveyed to the position "a" is not pulled back. When the cam follower 44 passes backward through the fixed cam 47, it falls and returns to the lane plate 45.

As described above, according to the structure of the dispensing device 31, when extracting the green compact 11 having the boss portion 13, the lower first punch 19 projects from the upper end surface of the die 18, and the lower second punch 20 projects. In a powder molding press in which the upper end surface of the lower first punch 19 protrudes, a substantially U-shaped
The next dispensing body 32 is provided so as to be movable up and down, and is urged upward by a spring 34, and is engaged with the advancing primary dispensing body 32 on the die plate 17 to push down the primary dispensing body 32. The provision of the presser 36 ensures that the compact 11 can be dispensed without fear of damage. That is, the boss portion 13 of the extracted green compact 11 is surrounded later by the primary dispensing body 32, and then the gear portion of the green compact 11 is placed on the primary dispensing body 32.
The green compact 11 is conveyed forward with the 12 loaded thereon, and furthermore, the primary dispensing body 32 is pushed down by the presser 36 so that the green compact 11 is gently landed on the die plate 17 and the subsequent feeder At the time of retreat 26, the green compact 11 does not follow the primary dispensing body 32, so that the green compact 11 can be reliably discharged without fear of damage. And like this, the primary payout body
The green compact 11 discharged by 32 can be further discharged to the chute 23 by the secondary discharging body 41 whose height is controlled by the cams 47 and 48. Moreover, the structure of the dispensing device 31 is simple, and its operation can be assured.

Next, a second embodiment of the green compact discharging apparatus for a powder molding press according to the present invention will be described with reference to FIGS. 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 denoted by the same reference numerals and the description thereof will be omitted. Omitted. However, a horizontal extension table 60 is interposed between the die plate 17 and the chute 23. In the green compact discharging 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 located above the upper end surface of the lower second punch 20 positioned at the ascending limit with respect to the die 18 and the gear portion of the compact 11 placed on the lower second punch 20. 12
Are 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 behind, and has the gear portion 12 mounted thereon. Further, a green compact lane plate 63 is fixed on the die plate 17 and the extension table 60 in front of the die 18. That is, the green compact lane plate 63 is provided with the green compact 11 whose upper surface is discharged.
Slides forward. The rear portion of the green compact lane plate 63 is a mountain portion 64 that is inclined such that the rear foot portion gradually rises forward. The height of the peak portion 64 is lower than the height of the lower surface of the primary dispensing member 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 member 62. It is higher than the value.

Further, on the front side of the feeder 26, 2
The next dispensing body 71 is also supported at its rear end by a support shaft 72. The secondary dispensing body 71 swings up and down with the left-right direction as the rotation axis direction. The secondary dispensing body 71 has a frame shape, and a pair of pushing parts 73 and 74 for pushing the green compact 11 forward are fixed to the front part. The rear extruding portion 73 is at least separated from the primary dispensing body 62 by at least the diameter of the green compact 11, and the front extruding portion 74 is at least forward of the rear extruding portion 73. They are separated by more than the diameter of the compact 11. And the secondary payout body 71
This secondary dispensing body is similar to that of 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 moves forward, it is positioned lower, while when the feeder 26 is retracted, it is positioned higher, and its extruded portions 73, 74 are positioned higher than the green compact 11 on the green compact lane plate 63. It has become. In addition, a sensor 86 for detecting the presence or absence of the green compact 11 is provided in the rear extruding portion 73. The sensor 86 has a contact 87 that contacts the green compact 11 from above.

Next, the operation of the above configuration will be described. When the upper punch 22 is fitted into the die 18 during molding, the die 18 is located inside the secondary dispensing member 71 and between the primary dispensing member 62 and the rear extruding portion 73. When the formed green compact 11 is withdrawn, as shown in FIG. 9, finally, the lower first punch 19 has its upper end located slightly above the upper end surface of the die 18, and the lower second punch 20 has The upper end thereof is located slightly above the upper end surface of the lower first punch 19. A primary dispensing body 62 that advances with the feeder 26 surrounds the boss 13 of the green compact 11 from behind, and
Start pushing forward. Thereafter, as the die 18 rises, or as the green compact 11 separates from the upper part of the lower second punch 20, the green compact 11 slightly lowers, as shown in FIG. On the primary dispensing body 62. Then, after passing over the die 18, the green compact 11 is gently placed on the mountain 64 of the green compact lane plate 63 as the feeder 26 advances. Accordingly, the green compact 11 rises with respect to the primary dispensing body 62, whereby 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 transported by the primary dispensing body 62 to a position indicated by a on the peak 64. Thereafter, the feeder 26 starts to retreat. At this time, as described above, since the primary dispensing body 62 is separated downward from the gear portion 12 of the green compact 11,
The green compact 11 is not attached to the next discharging body 62, the green compact 11 is stopped at the position a, and the primary discharging body 62 is
Boss 13 Next, when the feeder 26 moves forward, the green compact 11 at the position a is pushed by the pushing part 73 on the rear side of the secondary dispensing body 71 as shown in FIGS. 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 pushing section 74 on the front side of the secondary dispensing body 71, further conveyed forward, and thrown into the chute 23. Thus, one compact
11 is paid out in three stages. When the feeder 26 advances 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 dispensing member 71 discharge the compact 11 forward as described above. Meanwhile, feeder 26
12, when the cam follower 76 slides on the cams 47 and 48, as shown in FIG.
The extruded portions 73 and 74 pass above the green compact 11 at the positions a and b. That is, when the feeder 26 retreats, the pushing parts 73 and 74 do not interfere with the green compact 11,
The green compact 11 transported to the positions a and b is not pulled back.

As described above, according to the structure of the dispensing device 61, when extracting the green compact 11 having the boss portion 13, the lower first punch 19 protrudes from the upper end surface of the die 18, and the lower second punch 20 In the powder molding press projecting from the upper end surface of the lower first punch 19, the substantially U-shaped primary dispensing body 62 is fixed to the front side of the feeder 26, and the peak portion 64 is provided on the die plate 17. Thereby, the compact 11 can be reliably dispensed without fear of damage. That is, the boss portion 13 of the extracted green compact 11 is surrounded later by the primary dispensing body 62, and thereafter,
The green compact 11 is conveyed forward with the gear portion 12 of the green compact 11 mounted on the primary dispensing body 62 and gently lands on the mountain 64, and then the feeder 26 is retracted. Time, green compact
Since 11 does not follow the primary dispensing body 62, the compact 11 can be reliably dispensed without fear of damage. Then, the green compact 11 discharged by the primary discharging member 62 can be discharged to the chute 23 by the secondary discharging member 71 whose height is controlled by the cams 79 and 80. Moreover, the structure of the dispensing device 61 is simple, and its operation can be assured.

Incidentally, in the second embodiment, the compact 11
Is that 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 because the mold 16 is large or for other reasons.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made. For example,
In the above-described embodiment, the green compact 11 is the inner rotor for the internal gear pump, but is not limited to this. Further, the configuration of the molding die is not limited to that of the above embodiment. For example, in the mold 16 of the above embodiment, the lower punch is doubled, but may be a single punch.

[0027]

According to the first aspect of the present invention, there is provided a powder molding press in which a lower punch projects from an upper surface of a die when extracting a green compact having a small diameter portion below a large diameter portion. The green compact discharging device includes a primary discharging body that is vertically movably supported on the front side of the feeder and surrounds the small diameter portion of the green compact from behind and has a large diameter portion mounted thereon, and a spring for urging the primary discharging body upward, A presser that engages with and lowers the primary dispensing body when the feeder advances, a secondary dispensing body that is movably supported on the front side of the feeder, a cam follower fixed to the secondary dispensing body, Since the cam follower passes through the lower side when moving forward and the cam follower passes through the upper side when moving backward, and the extruding portion that is located forward of the primary dispensing body and is fixed to the secondary dispensing body, the lower punch On the primary dispensing body and transport it forward 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 discharging body, the green compact can be reliably discharged without fear of damage, and the structure of the green compact discharging apparatus is simple and its operation is also reliable. it can.

According to the second aspect of the present invention, the primary dispensing body is fixed to the feeder, and a gentle peak in the front-rear direction is provided on the die plate at a position below the locus of the primary dispensing body. Therefore, the green compact on the lower punch is placed on the primary discharging body and transported forward, and the green compact lands on the hill. You can pay it out without any risk of damage,
The structure of the compact discharging device is simple and its operation can be assured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a green compact discharging apparatus for a powder molding press according to the present invention.

FIG. 2 is a cross-sectional view illustrating an operation of the above.

FIG. 3 is a cross-sectional view for explaining the operation.

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

FIG. 5 is a cross-sectional view for explaining the operation.

FIG. 6 is a cross-sectional view for explaining the operation.

FIG. 7 is a side view illustrating the operation of the cam and the cam follower.

FIG. 8 is a perspective view showing a second embodiment of a green compact discharging device for a powder molding press according to the present invention.

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

FIG. 10 is a sectional view for explaining the operation of the above.

FIG. 11 is a cross-sectional view for explaining the operation.

FIG. 12 is a cross-sectional view for explaining the operation.

FIG. 13 shows an example of a conventional powder molding press.
FIG. 3 is a sectional view of a part of a molding die.

[Explanation of symbols]

 11 Compact 12 Gear part (large diameter part) 13 Boss part (small diameter part) 16 Mold 17 Die plate 18 Die 19 Lower first punch (Lower punch) 20 Lower second punch (Lower punch) 22 Upper Punch 26 Feeder 31 Green compact dispenser 32 Primary dispenser 34 Spring 36 Holder 41 Secondary dispenser 43 Extruder 44 Cam follower 47 Fixed cam (cam) 48 Movable cam (cam) 61 Compact compact dispenser 62 1 Next dispenser 64 Mountain 71 Secondary dispenser 73 Extruder 74 Extruder 76 Cam follower 79 Fixed cam (cam) 80 Movable cam (cam)

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B30B 11/00 B22F 3/02

Claims (2)

(57) [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 slidably fitted in the die in the vertical direction. And a feeder for sliding the die and die plate in the front-rear direction to supply raw material powder into the die, and the lower punch projects from the upper surface of the die. A powder compacting press for ejecting a compact compacted from a die, and a compacting device for ejecting the ejected compact from a die and a die plate in conjunction with the feeder; A primary dispensing body which is supported so as to be able to move up and down and surrounds the small diameter part of the compact from behind and on which the large diameter part is mounted, a spring for urging the primary dispensing body upward, and provided on the die plate The feeder is before the die A presser which engages with the primary dispensing body when it moves forward and lowers the primary dispensing body; and a supporter movably supported up and down on the front side of the feeder.
A next dispensing body, a cam follower fixed to this secondary dispensing body, a cam provided on the die plate, wherein the cam follower passes through the lower side when the feeder advances, and the cam follower passes through the upper side when retracting, An extruding unit which is located forward of the primary dispensing body, is fixed to the secondary dispensing body, and presses the green compact forward. 2. A small-diameter portion having a die fixed to a die plate and an upper punch and a lower punch slidably fitted in the die in a vertical direction and having a smaller diameter on the lower side of the large-diameter portion. And a feeder for sliding the die and die plate in the front-rear direction to supply raw material powder into the die, and the lower punch projects from the upper surface of the die. A powder compacting press for ejecting a compact compacted from a die, and a compacting device for ejecting the ejected compact from a die and a die plate in conjunction with the feeder; A primary dispensing body fixedly mounted on the compact body and enclosing the small-diameter portion of the green compact from behind and a large-diameter portion mounted thereon; and a die plate positioned forward of the die and below the locus of the primary dispensing body. In the front-back direction provided above A gently crested portion, a secondary dispensing body movably supported on the front side of the feeder, a cam follower fixed to the secondary dispensing body, and the cam provided on the die plate when the feeder advances. A cam follower that passes through the upper side when the follower passes through the lower side, and an extruding portion that is located forward of the primary dispensing body and is fixed to the secondary dispensing body and presses the green compact forward. A powder compact discharging device for a powder molding press.