JP2005271001A - Powder molding press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a powder molding press capable of reliably obtaining an excellent molded body even when the molded body is point-symmetrical or non-point-symmetrical, and performing powder molding without any early wear or deformation of components even with limitation on the space. <P>SOLUTION: The powder molding press for obtaining a molded body comprises a die 11, an upper first punch 12, a lower first punch 13, an engagement unit 43 to support the lower first punch 13, a lower first punch plate 34 having the lower first punch 13, and a stopper block 41 which is engaged with the engagement unit to support the lower first punch plate 34 at the first position. At least three engagement units 43 are arranged on the same circumference at equal intervals. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a powder molding press apparatus, and more particularly to a powder molding press apparatus suitable for obtaining an astigmatized molded product using powder.

  In this type of conventional powder forming press apparatus, when powder (for example, metal powder for metallurgy) is filled in the filling part of the die, the upper punch descends toward the filling part of the die to produce powder. When the upper punch and the die are further lowered while pressing downward, the core rod moves relative to the die in the filling portion to press the powder bottom upward, thereby compressing the powder from above and below. In order to obtain a molded product by performing the above, there has been proposed (for example, see Patent Document 1).

As a conventional example of such a powder molding press apparatus, as shown in FIG. 13, for example, a die 70 in which a filling portion A is formed, an upper first punch 71, a lower first punch 72, and a lower second punch 73.
The upper first punch 71 is fixed to the upper punch plate 74, and the upper punch plate 74 is connected to the upper ram 75.
The lower second punch 73 is fixed to a base plate 77 fixed to the bolster 76, and the lower first punch 72 is positioned on the outer peripheral side of the lower second punch 73 and fixed to the lower first punch plate 78. Has been.
The lower first punch plate 78 is moved up and down by a filling cylinder 79, and a sliding block 90 is provided on the lower surface of the lower first punch plate 78.
The sliding block 90 is provided at two locations on the lower surface of the lower first punch plate 78 so as to face each other.
Further, a stopper block 91 provided on the base plate 77 is provided below each sliding block 90.
The die 70 is provided on the die plate 92, and a sliding block opening wedge 93 corresponding to the sliding block 90 is provided on the lower surface of the die plate 92.
A core rod 94 is fitted into the lower second punch 73, and the core rod 94 is fixed to a yoke plate 95 that moves the die plate 92 up and down.
The die plate 92 is connected to a yoke plate 95 via a rod 96, and the yoke plate 95 is connected to the lower ram 98 by a T joint 97, and the die plate 92 is displaced by the lower ram 98.

In the conventional powder press apparatus 80 configured as described above, the filling portion A is filled with the powder P as shown in FIG. 13 in the filling step.
In the pressing step, as shown in FIG. 14, the upper first punch 71 and the die plate 92 are lowered to press the upper surface of the powder P.
When the upper first punch 71 presses the upper surface of the powder P, the lower first punch plate 78 descends at a speed slower than the descending speed of the upper first punch.
For this reason, the upper surface and the lower surface of the powder P are simultaneously pressed by the upper first punch 71 and the lower first punch 72.
When the lower first punch plate 78 is positioned at the first position L, the sliding block 90 is engaged with the stopper block 91, and the lower first punch plate 78 is stopped.
When the upper first punch 71 is lowered to a predetermined position, the molded product S is formed in the filling portion A.
In the extraction step, the upper first punch 71 is raised and the die plate 92 is further lowered.
When the die plate 92 is lowered, the sliding block opening wedge 93 horizontally moves the sliding ring block 90 to the side, and then the extraction nut 93a pushes the lower first punch plate 78 downward from the first position L. .
When the upper surface of the lower first punch 72, the lower first punch 73, the upper surface of the die plate 92, and the upper surface of the core rod 94 are located at the same position, the molded product S is extracted from the filling portion A.
The molded product S thus extracted is then heat-treated in a sintering furnace.
JP 2002-115003 A

  By the way, in the conventional example shown above, when forming a point-symmetric shape as the molded product S, the pressing force by the upper first punch 71 acts equally on the stopper block 91 via the lower first punch 72. Therefore, although there is no problem, for example, as shown in FIG. 15, there is the following problem when the molded product S having an asymmetrical shape is formed.

That is, when forming the asymmetric product S, when the upper first punch 71 presses the powder P in the filling portion A, the lower first punch 72 and the lower first punch plate 78 have a stress distribution. An astigmatic deflection load is generated, and the sliding block 90 and the stopper block 91 are supported. However, since the sliding block 90 and the stopper block 91 are provided symmetrically at two locations, the stress distribution is non-uniform. The point-symmetric deflection load cannot be satisfactorily supported, the lower first punch plate 78 and the lower first punch 72 are inclined, and the parallelism cannot be maintained, and a good molded product S cannot be obtained. There was a problem.
In particular, when the stress distribution of the deflection load extends in a direction orthogonal to the direction in which the stopper block 91 is disposed, the lower first punch plate 78 is inclined, and the lower first punch 72 and the lower first punch 73 are the lower first. There was a problem that the parallelism of the formed product S which is tilted together with the punch plate 78 is deteriorated.
Further, when the lower first punch 72 is tilted, the lower first punch 72 cannot be satisfactorily slid in the filling portion A, and excessive friction is caused between the die 70 and the lower first punch 73. As a result, there is a problem that the die 70, the lower first punch 72, the lower first punch 73 and the like are prematurely worn and deformed.
Furthermore, in order to solve this problem, although the sliding block 90, the stopper block 91, and the lower first punch plate 78 are configured with larger ones to increase the rigidity, it is possible to eliminate the problem, but originally the space There was also a problem that the size could not be increased because of the restrictions.

  The present invention has been made in consideration of such circumstances, and the object of the present invention is to reliably obtain a good molded product as well as a point-symmetrical molded product as well as an asymmetrical molded product. In addition, an object of the present invention is to provide a powder molding press apparatus that can be molded without premature wear or deformation of components even when space is limited.

In order to achieve the above object, the present invention proposes the following means.
The invention according to claim 1 is a die having a filling portion formed in the center and supported so as to be movable up and down, an upper punch provided at an upper position of the die and supported so as to advance and retreat toward the filling portion, When the powder filled in the filling portion is compressed, the lower punch is attached to the filling portion so as to be relatively movable in the vertical direction and defines the filling portion together with the die, the engaging portion supporting the lower punch, and the filling portion. A stopper block that engages with the engaging portion and supports the die in a first position, and when the filling portion is filled with powder, the upper punch presses the upper portion of the powder downward The lower punch, which moves relative to the lowering of the upper punch and the die, presses the lower part of the powder upward to compress the powder and obtain a molded product, wherein the engagement At least three equally spaced parts on the same circumference Characterized in that it is arranged.

According to the powder molding press device according to the present invention, the deflection load generated in the lower punch is equally received by the annular engaging portion, so that the lower punch does not tilt when molding the powder, and is good Powder molding is performed.
Furthermore, when molding a molded product, the lower punch does not tilt even in a portion subjected to a deflection load, so that an extreme pressure portion is prevented from being generated between the die and the lower punch. be able to.

    According to a second aspect of the present invention, in the powder molding press apparatus according to the first aspect, when the molded product is extracted, the engagement between the stopper block and the sliding block on which the engaging portion is formed is released. And an unloading mechanism for lowering the die and the lower punch from the first position.

  According to the powder molding press device according to the present invention, the engaging portion formed on the sliding block is detached from the stopper block by the detaching mechanism, and the lower punch and the die are interposed between the engaging portion and the support portion. A space in which the lower punch and the die are further lowered is formed, and when the lower punch and the die are lowered, the molded product is pushed out from the filling portion.

  According to a third aspect of the present invention, in the powder molding press apparatus according to the first or second aspect, the detachment mechanism is configured such that the engagement portion is movable in the horizontal direction, while facing the die downward. An open wedge that protrudes and engages with the engaging portion to move the engaging portion is provided.

  According to the powder molding press apparatus according to the present invention, the open wedge hangs the engaging portion from the stopper block, and the molded product is pushed out from the filling portion.

  According to a fourth aspect of the present invention, there is provided the powder molding press according to the first aspect, wherein the powder molding press device has an annular shape that can be rotated about the extension line of the center as a central axis, and a protruding portion that protrudes downward and an upper portion on the bottom surface The projecting portion is provided with an annular body in which concave portions formed by recesses are alternately arranged in the circumferential direction, and a roller portion that is rotatably provided on the annular body and rotates the annular body. The portion constitutes the engaging portion.

  According to the powder molding press device of the present invention, when the annular body rotates in the circumferential direction, the protruding portion that has been in contact with the stopper block is disengaged in the circumferential direction, and the recessed portion is positioned in the stopper block. A space for lowering the lower punch and the die is formed between the stopper block and the annular body.

  According to a fifth aspect of the present invention, there is provided the powder molding press according to the first aspect, wherein the powder molding press has a ring shape rotatable about the central extension line, and a projecting portion projecting downward and an upper surface on the bottom surface thereof. A helical gear in which concave portions formed by recesses are alternately arranged in the circumferential direction; and an interlocking member that meshes with the helical gear, and the protruding portion constitutes an engaging portion. It is characterized by.

  According to the powder molding press device according to the present invention, when the helical gear rotates in the circumferential direction, the protruding portion is disengaged from the stopper block, and the recessed portion is positioned in the stopper block, and the space where the die and the lower punch descend. Is formed, and the lower punch and the die are lowered, whereby the molded product is extruded from the filling portion.

  According to a sixth aspect of the present invention, in the powder molding press according to the first aspect of the present invention, the engaging portion is supported so as to be rotatable about the center, while the annular is rotatable about the extension line of the center. And an annular body in which a projecting part projecting downward and a recessed part formed by recessing upward are alternately arranged in the circumferential direction on the bottom surface thereof, and installed on the side of the annular body. And a cylinder portion for rotating the body.

  According to the powder molding press device according to the present invention, the cylinder portion only needs to be positioned on the side of the engaging portion, and does not need to be installed in a portion where the lower punch or the die is provided. Is secured.

  According to the first aspect of the present invention, even if a deflection load is generated by the upper punch and the die, the deflection load can be supported by the three engaging portions, so regardless of the shape of the molded product. Thus, it is possible to reliably form a molded product of good quality, and to prevent the peripheral components such as the engaging portion, the lower punch, and the core rod from being prematurely worn or deformed.

  According to the invention of claim 2, the detaching mechanism is formed in the filling portion to release the engagement state between the stopper block and the sliding block and to displace the lower punch plate downward from the first position. The molded product can be extracted well.

  According to the invention of claim 3, since the opening wedge of the detaching mechanism moves the engaging portion by engaging with the engaging portion, the die and the lower punch can be surely lowered, and the molded product The effect that can be extracted satisfactorily is obtained.

  According to the fourth aspect of the present invention, the engaging portion can be satisfactorily engaged with and released from the stopper block, space can be saved, and the engaging portion is rotated to be compressed. The effect which becomes effective also with respect to the deflection load at the time is acquired.

  According to the fifth aspect of the invention, since the die and the lower punch can be lowered from the first position by using the helical gear, the engagement of the engagement portion with respect to the stopper block and the release thereof can also be performed by this. It can be performed well and space saving can be realized.

  According to the sixth aspect of the present invention, the engagement portion is engaged with and released from the stopper block by a cylinder installed at an arbitrary place on the side of the engagement portion. It is not necessary to provide an overhanging mechanism such as an open wedge in a space where the mold such as the lower punch and the toolset members are densely packed, and space saving can be realized.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views showing a powder molding press apparatus according to a first embodiment of the present invention.
A powder molding press apparatus 10 according to the first embodiment shown in FIG. 1 includes a die 11 in which a filling portion A is formed, an upper first punch 12, a lower first punch 13, and a lower second punch 14. And the core rod 15.

The die 11 is fixed to the die plate 16, and an opening wedge 17 and a rod 18 are provided on the lower surface of the die plate 16.
A yoke plate 19 is provided at the lower end of the rod 18, and a lower ram 30 for moving the yoke plate 19 up and down is fixed to the lower surface of the yoke plate 19.
The upper first punch 12 is fixed to an upper punch plate 32 by an upper punch presser 31, and the upper punch plate 32 is fixed to an upper ram 33 that moves the upper punch plate 32 up and down.

The lower first punch 13 is fixed to the lower first punch plate 34, and a lower surface of the lower first punch plate 34 is provided with a filling cylinder 35 that moves the lower first punch plate 34 up and down.
In addition, the lower first punch 13 is formed with a through hole 13a into which the lower second punch 14 is inserted, and the through hole 13a is formed at a position eccentric from the center of the lower first punch 13. .
That is, in a part of the lower first punch 13, a thin portion and a thick portion are formed.
Therefore, a part of the filling portion A defined by the lower first punch 13, the lower second punch 14, and the core rod 15 has a shape protruding to one side.
The die 11, the lower first punch 13, the lower second punch 14, the lower first punch plate 34, the upper first punch 12, the upper punch plate 32, the rod 18, and the yoke plate 19 A toolset is configured.

The lower first punch plate 34 is formed with a through-hole through which the sliding block opening wedge 17 slides, and the lower first punch plate 34 is attached to the apparatus main body as shown in FIG. Three sliding blocks 36 are provided on the same plane around the central axis O of the tool set.
That is, the sliding blocks 36 are arranged at approximately 120 degree intervals on the same circumference with the center axis O of the tool set as the center.
The center axis O of the tool set is located at the center of gravity of the bottom surface of the filling portion A formed by the upper end surfaces of the lower second punch 14 and the lower first punch 13 when the filling portion A is viewed from above.
Further, as shown in FIG. 1, the sliding block 36 is formed with a hole portion 37 into which the sliding block releasing wedge 17 enters, and the hole portion 37 is provided with a roller portion 38.

The lower second punch 14 is fixed to a base plate 40 fixed to the bolster 39, and is positioned on the inner peripheral side of the lower first punch 13.
The base plate 40 is provided with a stopper block 41 corresponding to each sliding block 36.
That is, the stopper blocks 41 are arranged at intervals of approximately 120 degrees on the same circumference around the center axis O of the tool set.

In the sliding block 36, an end portion on the lower second punch 14 side is formed with an engaging portion 43 that contacts and engages with the stopper block 41.
The sliding block opening wedges 17 are provided at three locations on the same circumference on the same circumference at intervals of approximately 120 degrees corresponding to the sliding blocks 36.
Further, a tapered surface 42 that is gradually inclined outward from the lower end side toward the upper end side is formed at the lower end portion of the sliding block opening wedge 17, and the diameter-extended extraction nut is formed at the upper end portion. 17a is provided.
Further, the sliding block releasing wedge 17 constitutes an unloading mechanism 20 that presses the roller portion 38 of the sliding block 36 and releases the engaged state between the sliding block 36 and the stopper block 41.

In the powder molding press apparatus 10 configured as described above, in the filling step, the die 11, the lower first punch 13 and the lower second punch 14 are arranged at predetermined positions, and the filling portion A is filled with the powder P. .
As shown in FIG. 2, in the pressurizing step after the filling step, first, the upper first punch 12 presses the upper surface of the powder P.
When the upper first punch 12 presses the upper surface of the powder P, the die 11 descends in synchronization with the upper first punch 12. On the other hand, the lower first punch 13 descends at a lowering speed slower than the lowering speed of the upper first punch 12, and the lower second punch 14 is fixed at a fixed position.
For this reason, the lower surface and the upper surface of the powder P are simultaneously compressed by the upper first punch 12 and the lower first punch 13.

When the lower first punch plate 34 is positioned at the first position L, the engaging portion 43 formed on the sliding block 36 contacts and engages the stopper block 41, and the lower first punch plate 34 stops descending. To do.
In the final step of the pressurizing process, the lower first punch 12 is lowered to a predetermined position, and the molded product S is formed in the filling portion A.
As shown in FIG. 2, the molded product S is formed in an asymmetric shape protruding to one side.
In this final step, the upper first punch 12 applies an excessive pressing force to the powder P, and therefore an excessive load is also applied to the lower first punch 13 and the lower second punch.

In the lower first punch 13, a load larger than the load applied to the upper surface of the thin portion is applied to the upper surface of the thick portion, and the lower first punch plate 34 has a lower first punch. The deflection load of the stress distribution along the shape of the lower surface of 13 is exerted.
At this time, since the engaging portion 43 of the sliding block 36 and the stopper block 41 are engaged with each other in an annular arrangement at three locations and support the lower first punch plate 34, the lower first punch plate 34 Disperse and support the deflection load generated in

That is, since the sliding block 36 and the stopper block 21 are both annularly arranged around the center of gravity of the filling portion A, the deflection load is canceled in accordance with the stress distribution of the deflection load generated in the lower first punch plate 34. Thus, the lower first punch plate 34 is supported, and an excessive bending moment is prevented from being generated in the lower first punch plate 34, and the lower first punch plate 34 is prevented from being inclined.
Further, since the engaging portion 43 of the sliding block 36 and the stopper block 41 are engaged in a state where they are annularly arranged at three locations, the lower first punch plate 34 is not easily tilted in any direction, and the lower first Inclination of the lower first punch 13 provided on the one punch plate 34 is also prevented.
Furthermore, since the sliding block 36 and the stopper block 41 support the load generated in the lower first punch plate 34 in a distributed manner, neither of the stopper block 41 and the sliding block 36 is subjected to an excessive load. The lower first punch plate 34 is favorably supported without bending the 36.

In the extraction step after the final step of the pressurization step, the die plate 16 is further lowered as shown in FIG.
When the die plate 16 is further lowered, the tapered surface 42 formed at the front end portion of the sliding block opening wedge 17 comes into contact with the roller portion 38 of the sliding block 36 to displace the sliding block 36 in the horizontal direction.
When the sliding block 36 moves horizontally, the engagement state between the engaging portion 43 of the sliding block 36 and the stopper block 41 is released.

When the engagement state between the engagement portion 41 of the sliding block 36 and the stopper block 41 is released, the extraction nut 17a presses the upper surface of the lower first punch plate 34, thereby further lowering the lower first punch plate 34. Displace downward.
As shown in FIG. 4, when the die plate 16 is further displaced downward, the lower first punch 13, the lower second punch 14, the core rod 15, and the upper surface of the die plate 16 are positioned at the same position. Then, the molded product S is pushed out from the filling part A.

According to this molding powder press apparatus 10, since the lower first punch plate 34 is not easily tilted in any direction in the final step of the pressurizing step, the lower first punch 13 fixed to the lower first punch plate 34 is Inclination can be prevented, and the shape of the molded product S formed in the filling portion A can be prevented from being bent or deformed.
Further, since the lower first punch 13 is prevented from inclining, it slides well between the lower first punch 13 and the die 11 and between the lower first punch 13 and the lower second punch 14. Thus, early wear of the lower first punch 13, the lower second punch, and the die 11 can be prevented.

Further, the engaging block 43 of the sliding block 36 and the stopper block 41 are engaged in a state where they are annularly arranged at three locations, and the deflection load generated on the lower first punch plate 34 is dispersed and supported. It is possible to prevent an excessive load from being applied to 36 and the stopper block 41 and to prevent the stopper block 36 from being bent.
For this reason, it is possible to prevent the lower first punch plate 34 from being bent, and to reliably prevent the lower first punch 13 from being inclined.

6 to 8 show a powder molding press apparatus according to a second embodiment of the present invention.
6-8, the same code | symbol is attached | subjected to the structure same as FIGS. 1-5, and the description is abbreviate | omitted.
As shown in FIG. 6, an annular body 50 formed in an annular shape is provided on the lower surface of the lower first punch plate 34 of the powder molding apparatus 10.

The annular body 50 is arranged so that the center axis O of the tool set is the center, and as shown in FIGS. 7A and 7B, the annular body 50 projects downward from the lower portion of the annular body 50. The protrusion part 50a (engagement part) to perform and the dent part 50b formed so that it may dent upwards are provided. The protrusions 50a and the recesses 50b are provided alternately at three locations along the circumferential direction of the annular body 50. Further, the annular body 50 is provided with two roller portions 50c at opposing positions via a shaft portion 50d.
As shown in FIG. 6, a sliding block releasing wedge 17 is provided above the roller portion 50c, and the lower end portion of the sliding block releasing wedge 17 is along the peripheral surface of the roller portion 50c. A tapered surface 42a is formed.

  In the powder molding press device 10 configured as described above, in the final step of the pressurizing step, the projecting portion 50a of the annular body 50 and the stopper block 41 shown in FIG. The first punch plate 34 is supported, and the lower first punch plate 34 shown in FIG. 2 is located at the first position L.

In the extracting step, the die plate 16 is lowered, and the tapered surface 42 a formed on the sliding block opening wedge 17 presses the peripheral surface of the roller portion 50 c of the annular body 50.
When the roller portion 50c is pressed by the tapered surface 42a, the annular body 50 is rotated in the circumferential direction, and the annular body 50 is rotated in the direction of the arrow A as shown in FIG. Thus, the recess 50b is positioned above the stopper block 41 by moving from the protrusion 50a to the position of the recess 50b.
In FIG. 6, when the die plate 16 is lowered, the upper surface of the die 11 and the upper surface of the lower first punch 13 are in the same position.
Further, when the die plate 16 is lowered, the first punch plate 34 is moved downward by the extraction nut 17a provided on the lower surface of the die plate 16, and the die 16, the lower first punch 13, and the lower second The upper surface of the punch 14 is at the same position, and the molded product S is extracted from the filling portion A.

According to this embodiment, since the annular body 50 is configured by forming the protruding portions 50a and the recessed portions 50b alternately at three locations in the circumferential direction and forming an annular shape, the annular body 50 is hung on the stopper block 41. Removal can be performed satisfactorily.
That is, the protrusion 50a and the stopper block 41 are in contact with each other to support the load generated in the lower first punch 13, while the annular body 50 is rotated so that the recess 50b is positioned in the stopper block 41. Thus, a space is formed in which the lower first punch plate 34 and the die plate 16 are lowered, and the lower first punch plate 34 and the die plate 16 are lowered, whereby the molded product S is pushed out from the filling portion A. Can do.

In addition, the sliding block opening wedges 17 provided at two locations release the engagement state between the protruding portions 50a provided at the three locations and the stopper block 41, and each protruding portion 50a and the stopper block 41 are connected to each other. It is not necessary to provide a corresponding sliding block opening wedge 17, and space saving can be achieved.
That is, since the projecting portion 50a and the recessed portion 50b are connected to each other in the annular body 50, each projecting portion 50a is provided if at least one detaching mechanism 20 that displaces the annular body 50 in the circumferential direction is provided. And the stopper block 41 can be released from the engaged state, and space saving can be reliably achieved.

Further, while the annular body 50 is formed in an annular shape around the central axis O of the tool set, when the molded product S is pushed out, the annular body 50 rotates around the central axis O of the tool set. Therefore, before and after extruding the molded product S, the annular body 50 does not occupy a new space, and space saving can be achieved.
Therefore, in this embodiment, it is extremely useful when there is a space limitation.

In the present embodiment, the annular body 50 is rotated by the tip of the sliding block opening wedge 17 coming into contact with the roller portion 50c. However, the present invention is not limited to this.
For example, instead of the roller portion 50c, a spherical bearing 50d may be used as shown in FIG. 8B.
The spherical bearing 50d is composed of a shaft portion 50f whose tip is formed in a spherical shape, and a receiving plate 50e provided at the tip of the shaft 50f.
Even when the sliding block releasing wedge 17 does not vertically contact the receiving plate 50e and the sliding block releasing wedge 17 contacts the receiving plate 50e from the inclined direction, the receiving block 50e is inclined, whereby the sliding block is released. The tip of the opening wedge 17 can be received well.

For this reason, even when the sliding block opening wedge 17 is inclined, the annular body 50 can be favorably rotated.
Moreover, in this embodiment, although the protrusion part 50a and the recessed part 50b are each provided in three places, you may provide in three or more places, respectively.
Furthermore, in this embodiment, since the protrusion part 50a is provided in three places and the stopper block 41 is also provided in three places, the effect | action and effect similar to 1st Embodiment can be acquired.

9 and 10 show a powder molding press apparatus according to a third embodiment of the present invention.
In this embodiment, an annularly formed helical gear 51 is provided on the lower surface of the lower first punch plate 34.
In FIG. 9, the lower surface of the helical gear 51 in this case is formed with three protruding portions 51a protruding downward along the circumferential direction and three recessed portions 51b recessed upward. ing.
Further, a tooth portion 51c is formed on the outer peripheral surface of the helical gear 51 so as to gradually follow the circumferential direction from the upper surface side toward the lower surface side.
The thus configured helical gear 51 is arranged so that the center axis O of the tool set is centered.

On the side of the helical gear 51, an interlocking member 17b corresponding to the tooth portion 51c of the helical gear 51 is provided. At the lower end of the interlocking member 17b, there is provided an interlocking portion 17c formed with a tooth portion 17d that meshes with the tooth portion 51c of the helical gear 51, and an extraction nut 17a is provided at the upper end of the interlocking member 17b. It has been.
A pressing portion 17e that presses the upper surface of the interlocking member 17b is provided on the lower surface of the die plate 16.
Below the interlocking member 17b, a support member 52 that supports the interlocking portion 17c when the interlocking portion 17c is displaced downward is provided.
The support member 52 is supported by an elastic member 45 such as a spring provided on the support member 45.

In the powder molding press device 10 configured as described above, the protrusion 51a of the helical gear 51 and the stopper block 41 are in contact with and engaged with each other in the final step of the pressurizing step, and the lower first punch plate 34 is engaged. Is supported at the first position L.
In the extraction step, as shown in FIG. 10, the upper punch 12 is displaced upward and the die plate 16 is displaced downward.
When the die plate 16 is displaced downward, the pressing portion 17e presses the upper surface of the interlocking member 17b, and the interlocking member 17b is displaced downward. When the interlocking member 17b is displaced downward, the tooth part 17d formed on the interlocking part 17c presses the tooth part 51c formed on the helical gear 51, thereby rotating the helical gear 51 in the circumferential direction.

When the helical gear 51 rotates in the circumferential direction, the engagement state between the protruding portion 51 a of the helical gear 51 and the stopper block 41 is released, and the recessed portion 51 b is located on the upper surface side of the stopper block 41.
Then, the die plate 16 is lowered, the pressing portion 17e displaces the lower punch plate 34 downward via the interlocking member 17b, and the molded product S is extracted from the filling portion A.
Therefore, according to this embodiment, the helical gear 51 can be reliably rotated, and the molded product S can be reliably extracted.
Also in this embodiment, since the helical gear 51 is formed in an annular shape as in the second embodiment, the same actions and effects as in the second embodiment can be obtained, and further, the helical gear 51 can be obtained. Since the protrusion 51a is formed in three places along the circumferential direction on the lower surface of the, the same actions and effects as in the first embodiment can be obtained.

11 and 12 are views showing a powder molding press apparatus according to a fourth embodiment of the present invention. In addition, about the same structure as the structure shown by FIGS. 1-10, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
As shown in FIG. 12, the annular body 50 in this case is formed in the same manner as in the second embodiment, has an annular shape, and has a protruding portion 50 a (engaging portion) and a recessed portion at the bottom. 50b are alternately provided in the circumferential direction.
And the connection members 27 and 27 are each provided in the outer peripheral part of this annular body 50 facing. The cylinder 25 may be either an air type or a hydraulic type.

In this embodiment, as shown in FIG. 11, when the die 11 is lowered, the cylinder 25 is driven to release the engagement between the projecting portion 15a of the annular body 50 and the stopper block 16, and the stopper block 16 and the recessed portion 15b. Is engaged with the lower first punch plate 34 from the first position L further downward.
In that case, when each cylinder 25 is driven synchronously, it is a matter of course that the rotation direction of the annular body 50 is set in advance so that either one is driven independently. It may be. Also in this embodiment, basically the same effects as those of the second and third embodiments described above can be obtained.
Further, since the cylinder 25 is provided on the side of the annular body 50, it is not necessary to provide the cylinder 25 in the central portion of the apparatus main body where the lower first punch 13, the core rod 15 and the like are concentrated, and a space in the central portion of the apparatus main body is ensured. be able to.

  In the illustrated embodiment, a configuration in which only one lower punch is used is shown. However, a mold structure using a plurality of lower punches, such as two, may be employed. In such a case, since the annular body 50 and the hooking mechanism are used for each lower punch 14 and the height can be easily changed, the present invention is not limited to the illustrated examples. Absent.

  In the present invention, the annularly arranged engaging portion can uniformly support the deflection load generated in the lower first punch and the lower first punch plate during molding, and the upper surface of the lower first punch is in any direction. Industrial applicability is recognized because a good molded product can be formed without inclining.

It is sectional drawing when the powder is filled which shows the powder molding press apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing in a compression process. It is sectional drawing in the extraction process of a molded article. It is sectional drawing which shows the state which extracted the molded article on the die | dye. It is a top view which shows arrangement | positioning of a sliding block. It is drawing which shows the powder molding press apparatus which concerns on 2nd Embodiment of this invention. (A) is sectional drawing of an annular body, (b) is a bottom view of an annular body. (A) is the explanatory perspective view which shows the relationship between an annular body and an overhanging mechanism, (b) is sectional drawing of the axial part used as the spherical bearing. It is a figure which shows the powder molding press apparatus which concerns on 3rd Embodiment of this invention, Comprising: It is an expansion explanatory drawing of a cyclic | annular body and a detaching mechanism. It is sectional drawing which shows the powder molding press apparatus which concerns on 4th Embodiment of this invention. It is sectional drawing in the extraction process of the powder shaping press apparatus shown by FIG. (A) is sectional drawing of an annular body, (b) is a bottom view of an annular body. It is a figure which shows the conventional powder molding press apparatus, Comprising: It is sectional drawing when powder is filled. It is sectional drawing which shows the compression process in the conventional powder molding press apparatus. It is a figure which shows the molded product of an asymmetrical shape, (a) is a top view, (b) is a front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Powder shaping press apparatus 11 Die 12 Upper 1st punch 13 Lower 1st punch 14 Lower 2nd punch 15 Core rod 16 Stopper block 20 Unloading mechanism 50 Annular body 51 Helical gear

Claims (6)

A die formed with a filling part at the center and supported so as to be movable up and down, an upper punch provided above the die and supported so as to be able to advance and retreat toward the filling part, and relative movement in the up and down direction with respect to the filling part A lower punch that is attached to the die and defines the filling portion, an engagement portion that supports the lower punch, a lower punch plate provided with the lower punch, and a powder filled in the filling portion A stopper block that engages with the engaging portion and supports the lower punch plate in a first position during compression,
When the powder is filled in the filling portion, the upper punch presses the upper part of the powder downward, while the lower punch that moves relatively with the lowering of the upper punch and the die moves the lower part of the powder upward. A powder molding press device that compresses the powder by pressing to obtain a molded product,
A powder molding press apparatus, wherein at least three engaging portions are arranged at equal intervals on the same circumference. In the powder molding press apparatus according to claim 1,
An unloading mechanism for releasing the engagement between the stopper block and the sliding block on which the engaging portion is formed and pulling the lower punch plate downward from the first position when the molded product is extracted. A powder molding press apparatus comprising: In the powder molding press apparatus according to claim 1 or 2,
The unloading mechanism includes an opening wedge that protrudes downward from the die and moves the engaging portion while the engaging portion is movable in the horizontal direction. Molding press device. In the powder molding press apparatus according to claim 1,
An annulus that is rotatable about the central extension line as a center axis, and that has a bottom surface and a plurality of protrusions that protrude downward and recesses that are recessed upward are alternately arranged in the circumferential direction. A powder molding press apparatus comprising: a body; and a roller portion rotatably provided on the annular body and rotating the annular body, wherein the protruding portion constitutes the engaging portion. . In the powder molding press according to claim 1,
Helical ring that is rotatable about the central extension line as a central axis, and has a projecting portion that protrudes downward and a recessed portion that is recessed upward in the circumferential direction. A powder molding press apparatus comprising: a gear and an interlocking member that meshes with the helical gear, wherein the protruding portion constitutes an engaging portion. 2. The powder molding press according to claim 1, wherein the engaging portion is supported so as to be rotatable around a center, and has an annular shape that is rotatable about an extension line of the center as a central axis, and on a bottom surface thereof. An annular body in which protrusions projecting downward and recesses formed by recessing upward are alternately arranged in the circumferential direction, and a cylinder part installed on the side of the annular body to rotate the annular body A powder molding press apparatus comprising:

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