JP2004130333A - Multi-cavity compacting press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-cavity compacting press with which height dimensions and the accuracy of density variation are improved and productivity is increased. <P>SOLUTION: This press is provided with a tool set 1 having a plurality of dies, a feeder device 2 for filling each die with molding powder in each hopper by integrally horizontally moving powder feeding hoppers of the same number and the same arrangement pattern as the dies onto die holders, weighing hoppers of the same number and the same arrangement pattern as the feeder device which are provided on the upper part of the powder feeding hoppers in the standby position, first stage transfer hoppers of the same number and powder feeding chutes of the same number provided between both hoppers. The press is constituted of a weighing device 3 for housing weighed molding powder in each hopper, a hopper device 4 for distributing and feeding the molding powder to each first stage transfer hopper with the powder hopper provided in the upper part of the weighing device 3 and a sub-hopper device 5 for feeding the molding powder of a prescribed weight in the each weighing hopper to each powder feeding hopper with the second transfer hoppers of the same number which are vertically moved between each weighing hopper and each powder feeding hopper. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a powder molding press in powder metallurgy, and in particular, to form a plurality of green compacts simultaneously with a single mold by performing double pressing (including both a floating die method and a withdrawal method) on molding powder. The invention relates to a multi-cavity powder molding press for obtaining.
[0002]
[Prior art]
The basic structure of a tool set in a multi-cavity powder molding press is already widely known.
In addition, it is also known that molding is performed by a weight weighing / weight filling method (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-1592 (1st line to 20th line on the left column on page 4 and FIG. 3)
[0004]
In the conventional multi-cavity powder molding press, the method of supplying molding powder to the die is based on the volume filling method, and is exclusively used because of its simple structure and favorable point of improving productivity. This method was adopted.
[0005]
As the volume filling method, there are two methods: "drop filling" performed by dropping the powder to its set filling depth by its own weight, and "suction filling" performed by moving the feeder onto the die holder in the withdrawn state and raising the die or lowering the lower punch. However, in both cases, there is a problem that the mass of the filled powder varies and the height dimension and density variation accuracy of the green compact are reduced.
[0006]
By the way, it is conceivable to adopt a weight weighing / weight filling method as shown in Patent Document 1 for a conventional multi-piece powder molding press by a volume filling method. On the other hand, it is not possible to fill powders weighed accurately at the same time and simultaneously with good productivity, and this cannot be easily achieved by conventional technical means. However, at present, such a multi-powder molding press of the weight weighing / filling type has not been provided.
[0007]
[Problems to be solved by the invention]
The present invention has been made in order to solve such problems, and accordingly, an object of the present invention is to improve the height dimension, the density variation accuracy, and to improve the productivity of the automatic powder. An object of the present invention is to provide a multi-cavity powder molding press capable of molding.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the applicant of the present invention provides a multi-cavity powder molding press for simultaneously molding a molding powder to obtain a plurality of compacts. A plurality of dies 7 arranged in a predetermined array pattern, a die holder 8 for holding the dies 7 integrally, a plurality of upper punches 9 and a plurality of upper punches 9 provided movably up and down corresponding to the dies 7 A tool set 1 having a die composed of a lower punch 10 and a plurality of powder feeding hoppers 11 provided in the same arrangement pattern as the respective dies 7, and a side standby at a center position along the upper surface of the die holder 8. A plurality of powder feeders 2 having a weight detector 18 and a powder feeder device 2 for horizontally moving from the position to fill each die 7 with a predetermined weight of molding powder in each powder hopper 11; Same arrangement above the feed hopper 11 A plurality of weighing hoppers 12 provided in turns, an equal number of first-stage relay hoppers 13 provided therearound, and a plurality of powder feeding chutes 14 provided between the two hoppers 12 and 13 and having an adjustable supply amount are provided. A weighing hopper having the same number of distribution bottom ports 23 as the weighing hoppers 12, each having a predetermined weight of formed powder in each weighing hopper 12 via the first-stage relay hopper 13 and the powder feeding chute 14; A hopper 15 provided above the hopper 12, and each distribution bottom port 23 is connected to each of the first-stage relay hoppers 13 to distribute and supply the molding powder in the powder hopper 15 to each of the first-stage relay hoppers 13. The apparatus has a plurality of second-stage relay hoppers 16 which are integrally and vertically movable in the same arrangement pattern between the plurality of weighing hoppers 12 and the powder feeding hoppers 11. And a sub-hopper device 5 for supplying a predetermined weight of the molding powder in the feeding unit 12 to each of the powder feeding hoppers 11 by passing the molding powder from the hopper device 4 to the weighing device 3, the sub-hopper device 5, and the powder feeding feeder device 2 in this order. It is intended to provide a multi-cavity powder molding press characterized in that powder molding is performed after multiple simultaneous weight weighing and weight filling are performed.
[0009]
In the above powder compacting press, it is assumed that the amount of compacting powder corresponding to several press moldings in advance is fed into the powder hopper 15 of the hopper device 4 and the bottom is uniformly filled without gaps. The molding powder equally distributed and discharged through the port 23 is sent into each first-stage relay hopper 13 of the weighing device 3, and an appropriate amount of the molding powder is temporarily stored in each relay hopper 13.
[0010]
The molding powder stored in each weighing hopper 12 is fed into each weighing hopper 12 while adjusting the supply amount through each powder feeding chute 14. At this time, since the weighing operation of the weight detectors 18 is individually performed on each weighing hopper 12 side, it is possible to store a molding powder having an accurate weight corresponding to the amount of pressure molding in each die 7 of the mold. On the other hand, the feeding in each of the feeding chutes 14 is stopped.
[0011]
When the powder storage under the weight weighing in each of the weighing hoppers 12 is completed in this way, the sub-hopper device which opens the respective bottom ports and arranges the stored powder in each of the weighing hoppers 12 at a position immediately below the powder hoppers 12. 5 is fed into each second-stage relay hopper 16. Subsequently, the sub hopper device 5 is moved down to a position immediately above the powder feeder device 2, and when each of the second-stage relay hoppers 16 has reached a position immediately above each powder hopper 11, each bottom port is opened. Then, the powder stored in each second-stage relay hopper 16 is fed into each of the powder supply hoppers 11.
[0012]
When the powder has been delivered from the feeder feeder 2 to each of the feed hoppers 11, the feed hoppers 11 are then moved from the side standby position to a centered position along the upper surface of the die holder 8. When the bottoms of the respective feeding hoppers 11 are aligned with the respective dies 7, the bottoms of the respective feeding hoppers 11 are opened so that the molding powder having a predetermined weight in the feeding hopper 11 is removed. Each corresponding die 7 is filled. Thus, simultaneous multiple weight weighing and weight filling based on a series of operations can be performed reliably and smoothly.
[0013]
As described above, according to the powder molding press of the present invention, the plurality of powder feeding hoppers 11, the weighing hoppers 12, and the second-stage relay hoppers arranged in the same predetermined arrangement pattern as in the plurality of dies 7 are provided. 16 and a configuration capable of simultaneously performing reliable weight weighing in each weighing hopper 12, thereby easily providing a multi-cavity powder molding press based on the “weight filling” method. It is now possible.
[0014]
In order to solve the above-mentioned problem, the invention of claim 2 is characterized in that a plurality of powder feeding chutes 14 of the weighing device 3 in the powder molding press include a linear feeder 20 that vibrates the chutes 14 in a powder feeding direction; This invention provides a multi-cavity powder molding press having a configuration including vibration speed adjusting means 21 for vibrating the linear feeder 20 at least in three stages of high speed, medium speed and low speed.
[0015]
In the powder compacting press, when powder is supplied by a plurality of powder supply chutes 14, the linear feeder 20 can be adjusted to three speeds of a high speed, a medium speed, and a low speed by, for example, Easy and precise feeding amount control, such as feeding a large amount of powder in a short time with high-speed vibration, gradually lowering the vibration speed from medium speed to low speed, and finely adjusting the feeding amount in the final stage Therefore, it is possible to provide a multi-cavity powder molding press that can accurately and speedily perform weight weighing.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a multi-cavity powder molding press according to the present invention will be sequentially described with reference to the drawings.
FIG. 1 is a front view showing the appearance of a first embodiment of the powder molding press of the present invention, and FIG. 2 is a right side view showing the same appearance. The powder molding press shown in both figures includes a tool set 1, a powder feeder device 2, a weighing device 3, a hopper device 4, and a sub hopper device 5 as element mechanisms, and further includes a work unloading device 6. Provide as a mechanism.
Each of the above devices is systematized as one multi-cavity powder molding press, and the operation control of the whole can be centrally managed by the operation box 25 in the middle on the left side. The powder compacting press is configured so that, for example, seven columnar compacts of the same shape can be manufactured simultaneously.
[0017]
○ Configuration of tool set 1 :
FIG. 3 is a front view showing a partial cross section of the tool set 1, FIG. 4 is a plan view of the upper and lower punches 9 and 10 viewed from arrows A and C in FIG. 3, and FIG. It is sectional drawing of the die holder 8 part seen from arrow line B. The tool set 1 has the same basic configuration as a conventional multi-cavity multi-cavity tool set by the “withdrawal method”, and includes seven dies 7 arranged in a predetermined arrangement pattern, A die holder 8 for integrally holding the die 7, a die plate 50 surrounding and supporting the die holder 8, and seven upper punches 9 and seven lower punches 10 movably provided up and down corresponding to the respective dies 7 are element members. Is provided. In this case, the array pattern of each die 7 is set to a pattern having seven positions, for example, one point at the center of the die holder 8 and six points at six equally divided positions on one virtual circle around the die holder 8. Correspondingly, seven upper punches 9 and seven lower punches 10 are attached to the upper punch holder 26 and the lower punch holder 27, while the die holder 8 is located at the right of the center line in FIG. It moves downward between the uppermost position of the half and the lowermost position of the left half.
[0018]
○ Configuration of the feeder 2 :
FIG. 6 is a plan view showing a part of the powder feeder device 2 partially omitted and showing functions, and FIG. The powder feeder device 2 includes seven powder feed hoppers 11, an air cylinder 28 as an actuator for moving the hoppers 11 together, and a common opening for all the hoppers 11. A shutter 17 is provided, and an air cylinder 29 is provided as an actuator for horizontally sliding the shutter 17 for opening and closing.
[0019]
A pair of horizontal rails 31 are integrally attached to the die plate 50 supporting the die holder 8 in a set with the feeder table 51. Further, the upholstery plate 30 can be moved horizontally by being guided by the pair of horizontal rails 31. , And seven feeding hoppers 11 are attached to the upholstered plate 30 so that each bottom opening is opened downward at an equal horizontal level. In this mounting state, each bottom opening having a substantially identical circular shape to each die 7 has the same pattern arrangement as the arrangement pattern of each die 7. On the other hand, an air cylinder 28 is mounted between the upholstery plate 30 and the horizontal rail 31 so that the upholstery plate 30 is horizontally moved in accordance with the rod expansion and contraction operation of the air cylinder 28, and seven powder feeders are provided. The hopper 11 is moved from the standby position shown in FIG. 2 on the immediate side of the die holder 8 to a centered position along the upper surface of the die holder 8, that is, a position where the seven dies 7 and the seven bottom ports are aligned. Can be moved back and forth horizontally.
[0020]
On the other hand, the shutter 17 and the air cylinder 29 are provided immediately below the seven powder supply hoppers 11. As shown in FIG. 6, the shutter 17 has seven holes 32 formed in the same circular shape as the bottom ports of the seven powder feeding hoppers 11 at the positions of the same arrangement pattern as those bottom ports. The shutter 17 is horizontally moved in accordance with the rod expansion and contraction operation of the air cylinder 29, so that the shutter 17 can be switched between a simultaneous opening state in which all the seven holes 32 match the respective bottom openings and a simultaneous closing state shown in FIG. As a matter of course, the simultaneous opening state is performed in synchronization with the filling operation in which the seven powder feeding hoppers 11 are located at the center positions along the upper surface of the die holder 8, and the simultaneous closing state is the simultaneous filling state. Needless to say, it is performed at a time other than the operation. 6 and 7, reference numeral 33 denotes a guide tube attached to the upholstered plate 30, and reference numeral 34 denotes a guide rod inserted into the guide tube 33 and attached to the shutter 17.
[0021]
○ Configuration of weighing device 3 :
8 is a plan view of the weighing device 3 and the sub hopper device 5, FIG. 9 is a front view of the same, and FIG. 10 is a front view of one unit structure of the weighing device 3, respectively. The illustrated weighing device 3 includes seven weighing hoppers 12, seven first-stage relay hoppers 13, seven powder feeding chutes 14, and a weight detector realized by a load cell provided in each weighing hopper 12. 18, a shutter 19 also provided on each weighing hopper 12, a linear feeder 20 as a vibrating mechanism provided on the seven powder feeding chutes 14, and a vibration speed adjusting means 21 attached to each linear feeder 20. Prepare.
[0022]
The element members of each weighing hopper 12, each first-stage relay hopper 13, each powder feeding chute 14, each load cell 18, each linear feeder 20, and each vibration speed adjusting means 21 are respectively mounted on a base 35 in a predetermined arrangement. . The base 35 is horizontally fixed to the molding press body frame via the gantry 36 and the bracket 37 at a position directly above the powder feeder device 2 at the standby position.
[0023]
The seven weighing hoppers 12 are attached to the center of the base 35 so as to be vertically movable through the respective load cells 18 with their bottom ports opened downward at the same horizontal level. In this mounting state, each bottom opening having a circular shape has the same pattern arrangement as the above arrangement pattern, and is centered at a position directly above the seven powder supply hoppers 11 of the powder supply feeder device 2 respectively. The arrangement is as follows. As shown in FIG. 10, these weighing hoppers 12 have a wedge-shaped shutter 19 interposed at the bottom opening so as to be openable and closable. The shutter 19 is moved up and down by an air cylinder 38 as an actuator to open and close the bottom opening. Has become.
[0024]
The seven first-stage relay hoppers 13 are arranged around the corresponding weighing hoppers 12 and the height is determined so that each bottom port is at a slightly higher level position than the top-side entrance of the weighing hopper 12. To the base 35 respectively. In this case, as shown in FIG. 8, for example, the first-stage relay hopper 13 corresponding to one weighing hopper 12 at the center is disposed on the front side thereof, and the third relay hopper 13 corresponding to each of the three weighing hoppers 12 on the left side. The three first-stage relay hoppers 13 are arranged on the left side, and the three first-stage relay hoppers 13 corresponding to the three weighing hoppers 12 on the right side are arranged on the left side, so that they can be mounted compactly. Can be.
[0025]
On the other hand, each of the seven powder feeding chutes 14 has a cylindrical body formed in the shape of a square duct, and is provided between the bottom port of the first-stage relay hopper 13 and the top port of the weighing hopper 12 in a paired relationship. Although not shown, it is horizontally arranged so as to be capable of fine vibration via a buffer material or the like. A vibrating mechanism formed by integrally forming a linear feeder 20 and a vibration speed adjusting means 21 is attached to a lower portion of each of the powder feeding chutes 14, and the linear feeder 20 is driven to adjust the vibration speed. By vibrating each of the feeding chutes 14 in the feeding direction on the longitudinal side, the supply amount of the powder to be fed into the feeding chutes 14 can be increased or decreased. Reference numeral 39 in FIG. 10 is an adjustment gate for adjusting the opening amount, which is disposed at an intermediate portion of the powder feeding chute 14.
[0026]
○ Configuration of hopper device 4 :
FIG. 11 is a front view of the hopper device 4, and FIG. The hopper device 4 includes one powder hopper 15 and is attached to the forming press body frame at a position above the weighing device 3. The powder hopper 15 is formed as a double-outlet hopper having the same number of bottom mouths as the weighing hoppers 12 (seven in this embodiment) and having equal-shape distribution outlets 23 arranged in a row and opened. An air knocker 40 and a level switch 41 are mounted at appropriate locations in the body. The air knocker 40 uses air force to store the molding powder in a uniform and stable state without any gap above each distribution outlet 23 by using pneumatic force so that the molding powder in the hopper 15 does not stay unbalanced. On the other hand, the level switch 41 is provided as a detector for keeping the stored amount of the molding powder in the hopper 15 constant. The powder hopper 15 thus formed is connected to each of the distribution outlets 23 by connecting a flexible connecting pipe 24 made of, for example, a rubber hose, and connecting the end of each hose 24 to the top of each weighing hopper 12 located at a lower position. Each of the hoppers is connected to the inlet, so that the molding powder in the powder hopper 15 can be evenly distributed and supplied to each of the weighing hoppers 12.
[0027]
○ Configuration of sub hopper device 5 :
FIG. 13 shows a partially omitted bottom view of the sub-hopper device 5. 8, 9 and 13, the sub-hopper device 5 includes seven second-stage relay hoppers 16, an air cylinder 43 as an actuator that integrally moves the hoppers 16 up and down, A guide member comprising a guide cylinder 44 and a guide rod 45 as a guide mechanism, a single shutter 22 provided in common with the hoppers 16 so that the bottom ports can be simultaneously opened and closed, and the shutter 22 is opened and closed. And an air cylinder 47 as an actuator which is slid laterally for the weighing device 3 and is provided immediately below the weighing device 3 so as to move up and down with respect to the base 35 by the air cylinder 43 and the guide member as a whole. Mounted as possible.
[0028]
The horizontally disposed hopper mounting plate 42 is vertically movably mounted on the base 35 via an air cylinder 43 and the guide member, and seven second-stage relay hoppers 16 are provided on the hopper mounting plate 42 at respective bottom ports. Are fixed by opening downwards at the same horizontal level. In this mounting state, the top hopper openings of the seven second-stage relay hoppers 16 are aligned with the bottom openings of the respective weighing hoppers 12 in the same pattern arrangement as the arrangement pattern thereof, while each bottom opening is located on the lower side. The respective feed hoppers 11 are positioned so as to be centered in the same pattern arrangement as the arrangement pattern. The seven second-stage relay hoppers 16 attached in this manner move up and down between the seven weighing hoppers 12 and the seven powder feeding hoppers 11 as the rods of the air cylinder 43 expand and contract. It can be moved back and forth.
[0029]
On the other hand, the shutter 22 and the air cylinder 47 are provided immediately below each bottom opening of the seven second-stage relay hoppers 16. As shown in FIG. 13, the shutter 22 has seven holes 46 formed in the same circular shape as the bottom openings of the seven second-stage relay hoppers 16 at positions in the same arrangement pattern as those bottom openings. Then, the shutter 22 is horizontally moved in accordance with the rod expansion and contraction operation of the air cylinder 47 mounted between the hopper mounting plate 42 and the shutter 22 to simultaneously open all the seven holes 46 to the respective bottom ports. And the simultaneous closing state shown in FIG. In FIG. 13, reference numeral 48 denotes a guide cylinder mounted on the hopper mounting plate 42, and reference numeral 49 denotes a guide rod inserted through the guide cylinder 48 and mounted on the shutter 22.
[0030]
○ Powder press operation :
It is assumed that a required amount of molding powder for the required number of press moldings has been sent into the powder hopper 15 of the hopper device 4 and that the bottom is uniformly filled without gaps, and is equally distributed by the distribution bottom ports 23. The discharged molding powder is sent into each first-stage relay hopper 13 of the weighing device 3, and an appropriate amount of the molding powder is temporarily stored in each relay hopper 13.
[0031]
The molding powder stored in each relay hopper 13 is sent into each weighing hopper 12 while adjusting the supply amount through each powder feeding chute 14. At this time, on each feed chute 14 side, the vibration speed of the linear feeder 20 can be adjusted to three stages of a high speed, a medium speed, and a low speed. Feeding, the medium speed and low speed are sequentially reduced in vibration speed, and in the final stage, feed amount control such as fine adjustment of the feed amount is performed. On the other hand, a weight detector is provided on each weighing hopper 12 side. The weighing operation by each of the dies 18 is performed individually, so that the molding powder having an accurate weight corresponding to the amount of the press molding in each die 7 of the mold can be stored in each weighing hopper 12, while Feeding by the powder chute 14 is stopped.
[0032]
When the powder storage under the weight weighing in each of the weighing hoppers 12 is completed in this way, the sub-hopper device which opens the respective bottom ports and arranges the stored powder in each of the weighing hoppers 12 at a position immediately below the powder hoppers 12. 5 is fed into each second-stage relay hopper 16. Subsequently, the sub hopper device 5 is moved down to a position immediately above the powder feeder device 2, and when each of the second-stage relay hoppers 16 has reached a position immediately above each powder hopper 11, each bottom port is opened. Then, the powder stored in each second-stage relay hopper 16 is fed into each of the powder supply hoppers 11.
[0033]
When the powder has been delivered to each of the powder feeding hoppers 11 of the powder feeding feeder device 2, the powder feeding hoppers 11 are then integrated into a centered position along the upper surface of the die holder 8 from a side standby position. When the bottom opening of each feeding hopper 11 is aligned with the center of each die 7, the bottom opening is opened to handle the molding powder having a predetermined weight in the feeding hopper 11. Each die 7 to be filled. Thus, simultaneous multiple weight weighing and weight filling based on a series of operations can be reliably and smoothly repeated.
[0034]
【The invention's effect】
According to the multi-cavity powder molding press of the present invention, a plurality of powder feeding hoppers, a weighing hopper, and a second-stage relay hopper arranged in the same predetermined arrangement pattern as in the plurality of dies 7 are provided. With the configuration and the configuration capable of simultaneously performing reliable weight weighing in each weighing hopper, it is possible to easily provide a multi-cavity powder molding press based on the "weight filling" method. .
[0035]
In this way, by performing multi-piece picking based on the “weight filling” method, variations in the height of the green compact can be minimized, so that the time of the post-process (polishing, etc.) can be reduced or reduced. , Which contributes to productivity improvement. In addition, there is an advantage that the performance as a product can be improved by minimizing the density variation of the green compact.
[0036]
The present invention also provides a linear feeder in which a plurality of powder feeding chutes of the weighing device 3 vibrate the chutes in a powder feeding direction, and a vibration speed in which the linear feeder is vibrated at least in three stages of high speed, medium speed, and low speed. With the configuration including the adjusting means, there is an advantage that a multi-cavity powder molding press capable of easily and accurately controlling the feeding amount, accurately weighing, and speedily can be provided.
[Brief description of the drawings]
FIG. 1 is a front view showing the appearance of a first embodiment of a powder molding press according to the present invention.
FIG. 2 is a right side view showing the appearance of the first embodiment of the powder molding press of the present invention.
FIG. 3 is a front view showing a partial cross section of the tool set 1;
FIG. 4 is a plan view of the upper and lower punches 9, 10 viewed from arrows A, C in FIG.
FIG. 5 is a cross-sectional view of the die holder 8 taken along the arrow line B in FIG.
FIG. 6 is a plan view showing a part of the powder feeding feeder device 2, which is partially omitted and functions.
FIG. 7 is a front view showing a part of the powder feeder device 2 in a partially omitted and functional view.
8 is a plan view of the weighing device 3 and the sub hopper device 5. FIG.
FIG. 9 is a front view of the weighing device 3 and the sub-hopper device 5.
FIG. 10 is a front view of one unit structure of the weighing device 3;
11 is a front view of the hopper device 4. FIG.
FIG. 12 is a vertical right side view of the hopper device 4;
FIG. 13 is a partially omitted bottom view of the sub-hopper device 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tool set 2 ... Feeding feeder device 3 ... Weighing device 4 ... Hopper device 5 ... Sub hopper device 6 ... Work unloading device 7 ... Die 8 ... Die holder 9 ... Upper punch 10 ... Lower punch 11 ... Feeding hopper 12 ... Weighing hopper DESCRIPTION OF SYMBOLS 13 ... 1st stage relay hopper 14 ... Powder supply chute 15 ... Powder hopper 16 ... 2nd stage relay hopper 17 ... Shutter 18 ... Weight detector 19 ... Shutter 20 ... Linear feeder 21 ... Vibration speed adjusting means 22 ... Shutter 23 ... Distribution Bottom mouth 24 ... Connecting pipe

Claims (2)

A multi-cavity powder molding press for simultaneously molding a molding powder to obtain a plurality of green compacts,
A plurality of dies (7) arranged in a predetermined arrangement pattern, a die holder (8) for integrally holding each die (7), and a plurality of dies provided to be vertically movable corresponding to each die (7). A tool set (1) including a mold including an upper punch (9) and a plurality of lower punches (10);
A plurality of powder feeding hoppers (11) provided in the same arrangement pattern as the respective dies (7) are provided, and are laterally moved from a standby position on the side to a concentric position along an upper surface of the die holder (8). A powder feeder device (2) for filling each die (7) with a predetermined weight of molding powder in each powder hopper (11);
A plurality of weighing hoppers (12) having a weight detector (18) and provided in the same arrangement pattern above the plurality of powder feeding hoppers (11) at the standby position, and an equal number of first hoppers provided therearound. A first-stage relay hopper (13), a plurality of powder supply chutes (14) provided between the two hoppers (12) and (13) and having an adjustable supply amount; A weighing device (3) for storing a predetermined weight of molding powder in each weighing hopper (12) via a powder chute (14);
A powder hopper (15) having the same number of distribution bottoms (23) as the weighing hoppers (12) and provided above the weighing hopper (12) is provided, and each distribution bottom (23) is connected to the first-stage relay hopper (13). And a hopper device (4) for distributing and supplying the formed powder in the powder hopper (15) to each first-stage relay hopper (13);
A plurality of second-stage relay hoppers (16) are provided between the plurality of weighing hoppers (12) and the powder feeding hopper (11) so as to be integrally movable in the same arrangement pattern in the vertical direction. And a sub-hopper device (5) for supplying a predetermined weight of the molding powder to each of the powder feeding hoppers (11) by delivery.
After the molding powder is sequentially weighed and filled by a large number of pieces, which is executed by sequentially passing through the hopper device (4), the weighing device (3), the sub hopper device (5), and the powder feeder device (2). A multi-cavity powder molding press characterized in that powder molding is performed. A plurality of powder feeding chutes (14) in the weighing device (3) are provided with a linear feeder (20) for vibrating the chute (14) in a powder feeding direction, and the linear feeder (20) is driven at least at high speed, medium speed and low speed. The multi-cavity powder molding press according to claim 1, further comprising a vibration speed adjusting means (21) for vibrating in three stages.

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