JP2001191313A - Method and device for holding powder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold powder in a more uniformized state and improve the quality of a molded body. SOLUTION: An opening on one side of a recess 3 of a mold 2 into which the powder F is fed is used as an upper opening 3a while another opening on the other side is used as a lower opening 3b, and an upper punch 4 to be inserted from the upper opening 3a and a lower punch 5 to be inserted from the lower opening 3b are provided, and a vibration means 40 for applying uniform vibration on the whole periphery of the mold 2 in which the powder F is fed is provided, and the outside of the mold 2 is formed into a point symmetrical shape with a central axis of the mold 2 extended into the pressing direction of the punches as its center, and the vibration means 40 is provided with a plurality of vibration sources provided outside the mold 2 in the equiangular relation and simultaneously driven, and a powder feed section 60 feeding the powder F into the recess 3 of the mold 2 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder molding method and a powder molding apparatus for molding various powders such as ceramics.

[0002]

2. Description of the Related Art Conventionally, an apparatus disclosed in Japanese Patent Application Laid-Open No. 2-151398 is known as a powder molding apparatus. This is to form ceramics as powder F, as shown in FIG.
And a mold 2 provided with a recess 3 in which is inserted. The recess 3 of the mold 2 is penetrated, and the machine base 1 has an opening on one side of the recess 3 as an upper opening 3a and the other side as a lower opening 3b.
Are located in The molding device is a punch that is inserted into the recess 3 of the mold 2 and presses the powder F to form a molded body. The upper punch 4 is inserted from the upper opening 3a of the recess 3; A lower punch 5 inserted from the lower opening 3 b of the recess 3. Further, an upper pressing mechanism 6 for applying a pressing force to the upper punch 4 by a hydraulic mechanism, and a lower pressing mechanism 7 for applying a pressing force to the lower punch 5 by a hydraulic mechanism.
And

Further, the upper pressing mechanism 6 is provided with a vibrating mechanism 8 for applying vibration to the upper punch 4 and applying vibration to the powder F during pressing. The machine base 1 has a mold 2
A powder supply section 10 for supplying the powder F is provided in the recess 3 of the hopper 11. The powder supply section 10 flows down from the hopper 11 via the hose 12 through the hopper 11 for storing the powder F. A nozzle 13 for introducing the powder F into the recess 3 from the upper opening 3a of the mold 2; and a moving mechanism 14 for supporting the nozzle 13 so as to be able to advance and retreat and allowing the nozzle 13 to be able to enter the recess 3 when moving out. It is comprised including.

[0004] When the powder F is molded by the powder molding apparatus, the lower pressing mechanism 7 is driven in advance to advance the lower punch 5 into the mold 2. Then, the nozzle 13 is advanced by the moving mechanism 14 in the powder supply unit 10, and the powder F is injected from the nozzle 13 into the recess 3 of the mold 2. Thereafter, the nozzle 13 is moved backward. In this state, the upper pressing mechanism 6 is driven to advance the upper punch 4 into the mold 2, and a pressing force is applied to the upper punch 4 and the lower punch 5, and the powder F is pressed at a required pressure. Press to form a compact. In this case, vibration is applied to the upper punch 4 by the vibration mechanism 8 so that the powder F is formed as uniformly as possible. After the molding, the upper punch 4 is retracted, the lower punch 5 is projected, the molded body is pushed out to the upper part of the mold, and the molded body is slid to the upper surface of the mold by the cylinder device 15 and taken out.

[0005]

By the way, in this conventional powder molding apparatus, the vibration is applied to the upper punch 4 by the vibrating mechanism 8 to form the powder F so as to be as uniform as possible. However, although the vibration of the upper punch 4 is transmitted to the mold 2 to some extent, the mold 2 also vibrates. However, since the vibration of the upper punch 4 is mainly used, the vibration is localized, and Is sometimes performed by the upper punch 4 and the lower punch 5 at one time, so that the uniformity of the powder F is insufficient.
Conventionally, there is also known an apparatus that vibrates the mold itself with an ultrasonic vibrator (for example, see Japanese Patent Application Laid-Open No. 1-143).
In this case, since the vibration source is provided at one point on the side or lower part of the mold, the vibration is also localized, so that the uniformity of the powder F is not uniform. There was a problem that it was enough.

Further, in the conventional powder molding apparatus, the hopper 11 of the powder supply unit 10 and the nozzle 13 are connected by the hose 12, and when the moving mechanism 14 moves the nozzle 13 forward and backward, the hose 12 is also moved. Since the powder F moves, the powder F may not flow down sufficiently, and there is a problem that a required molding amount of the powder F may not be reliably secured. Also, since the hose 12 moves, it is easy to interfere with surrounding parts,
For this reason, the surrounding space must be made as large as possible, so that there is a problem that the degree of freedom of the device design is impaired.

The present invention has been made in view of the above problems, and has been made to improve the quality of a molded product by enabling molding to be performed in a state where powder is more uniformly dispersed. An object of the present invention is to provide a powder molding method and a powder molding apparatus. Also, in the powder molding apparatus, the required amount of powder supplied from the powder supply unit can be reliably supplied, and the moving parts can be moved with the surrounding space as small as possible. ,As needed,
Assigned.

[0008]

The technical means of the present invention for solving the above problems is to put powder into a mold recess, insert a punch into the mold recess, and insert the powder into the mold recess. In a powder molding method of molding a compact by pressing the powder, a vibration is applied to apply uniform vibration to the entire periphery of the mold. According to this, a vibration is applied to apply uniform vibration to the entire periphery of the mold, and the vibration causes the powder to be dispersed in the recess while slightly moving in four directions. In particular, since uniform vibration is applied to the entire periphery of the mold, the vibration does not become localized as in the conventional case, but occurs evenly around the entire circumference, so that the powder can be more uniformly dispersed. Therefore, the molded body can be uniformly molded, and the quality of the molded body can be greatly improved. Then, if necessary, the outside of the mold is formed in a point-symmetrical shape around a center axis of the mold extending in the pressing direction of the punch, and a plurality of vibration sources are equiangularly arranged outside the mold. Are provided, and the vibration sources are simultaneously driven to apply vibration to apply uniform vibration to the entire periphery of the mold. The uniform vibration can be reliably applied to the entire periphery of the mold by the plurality of vibration sources, and the powder can be surely and uniformly dispersed.

[0009] If necessary, a divided powder obtained by dividing an amount of powder necessary for molding the molded body is put into a mold, and a vibration is applied to apply uniform vibration around the entire periphery of the mold. The process of performing the pressing and molding is one cycle, and the cycle is performed a plurality of times so that the divided powders are sequentially stacked and molded. As a result, uniform vibration is applied to the entire periphery of the mold in which the divided powder is placed by the vibrating means, and the divided powder is uniformly dispersed.
Since the uniformly molded divided molded bodies are stacked to form one molded body, as in the related art,
As compared to the case where the whole is molded at once, the powder becomes more uniform, and the quality of the product is improved.
Further, if necessary, the pressure in the final cycle is maximized. Finish molding is performed by the maximum pressing force. Furthermore, if necessary, the pressure in each cycle is sequentially increased. The inserted divided powder is pressed and molded together with the molded body of the divided powder that has been previously pressed and molded, and the final molding is performed by the maximum pressing force.

In order to solve the above-mentioned problems, a powder molding apparatus according to the present invention comprises: a mold having a recess having an upper opening in which powder is placed; and a mold inserted into the recess of the mold. And a punch for pressing the powder to form a compact by using a punching means for applying a uniform vibration to the entire periphery of the mold containing the powder. It is provided with a configuration. As a result, a vibration is applied to apply uniform vibration to the entire periphery of the mold. Due to this vibration, the powder is dispersed in the recess while slightly moving in four directions. In particular, since a uniform vibration is applied to the entire periphery of the mold, the vibration does not become localized as in the conventional case, and the vibration is uniformly generated around the entire circumference.
The powder is more evenly dispersed. Therefore, the molded body can be uniformly molded, and the quality of the molded body can be greatly improved. If necessary, the mold is formed in a point-symmetrical shape around the center axis of the mold extending in the pressing direction of the punch, and the vibrating means is equiangularly connected to the outside of the mold. And a plurality of vibration sources which are simultaneously driven. The uniform vibration can be reliably applied to the entire periphery of the mold by the plurality of vibration sources, and the powder can be surely and uniformly dispersed.

Further, if necessary, the mold is formed in a point-symmetrical shape with respect to the center axis of the mold extending in the pressing direction of the punch, and the vibrating means is provided outside the mold. A plurality of concave portions and convex portions alternately formed and arranged in an equiangular relationship, and the concave portions and the convex portions outside the concave portions and the convex portions are arranged in an equiangular relationship so as to be able to roll, and are simultaneously rolled. A plurality of balls to be moved, a ring body that holds the plurality of balls and is rotated about the central axis to roll the plurality of balls with respect to the plurality of recesses and protrusions; And a rotation mechanism for rotating the ring body. The uniform vibration can be reliably applied to the entire periphery of the mold by the plurality of balls, and the powder can be surely and uniformly dispersed.

Further, a powder supply unit for supplying powder to the concave portion of the mold is provided as required. Then, if necessary, the powder supply unit may open the upper opening of the concave portion of the mold, extend around the upper opening, slide the powder, and slide the powder into the concave portion. A base plate having a moving surface, and a hopper for storing the powder and feeding the powder,
A tank having a storage space for temporarily storing the powder flowing down from the hopper and having a shutter that can be opened and closed; a tank that flows down the powder in the storage space when the shutter is opened and stops flowing down when the shutter is closed; And a receiving position for receiving the powder that is moved along the sliding surface of the base plate and flows down from the tank, and slides the received powder on the sliding surface of the base plate to convey the powder. A carrier which is positioned at two positions of a loading position for loading into the recess from the upper opening of the mold, and which is slidably provided on the sliding surface of the base plate and which is received from the loading position. In the process of moving back to the position, the scraper is moved into the recess of the mold to scrape the powder above the sliding surface to flatten the upper surface of the powder in the recess, and the carrier is moved. And a moving mechanism for moving the same. Thereby, when the carrier is reciprocated, the carrier is separated from the tank and only the carrier moves, and the hose from the hopper does not move as in the conventional case, so that the hose does not move. For this reason, it is difficult to interfere with the surrounding parts, and therefore, the surrounding space can be widened, thereby increasing the degree of freedom of the device design. Further, in the related art, the powder may not flow down sufficiently because the hose also moves, so that the required molding amount of the powder may not be reliably secured. Instead of flowing directly down to the carrier, the powder flows down to the carrier through a tank that temporarily stores the powder,
The required amount of powder supply can be reliably received and supplied.

If necessary, the carrier is formed in a rectangular box shape having an opening on the lower surface side and an opening on the upper surface facing the outlet of the tank, and the upper end of the received powder is placed on the carrier. The detection is performed, and when the detection is performed, it is determined that the required powder has been received by the carrier, and a detection switch for performing control to close the shutter is provided. Since the required powder is detected, it is possible to reliably transport a required amount of powder. Further, if necessary, the mold is arranged so that the recess of the mold is penetrated, the opening of one side of the recess is an upper opening, and the other side is a lower opening, and the mold is inserted from the upper opening of the recess. An upper punch, a lower punch inserted from a lower opening of the recess, an upper pressing mechanism for applying a pressing force to the upper punch, and a lower pressing mechanism for applying a pressing force to the lower punch. And is configured. Furthermore, if necessary, the upper pressurizing mechanism includes a main pressurizing unit and a sub-pressurizing unit that can apply different pressing forces.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A powder molding method and a powder molding apparatus according to an embodiment of the present invention will be described below with reference to the accompanying drawings. Since the method of molding a powder according to the embodiment of the present invention is realized by the apparatus for molding a powder according to the embodiment of the present invention, the operation of the molding apparatus will be described. still,
The same components as those described above will be described with the same reference numerals. As shown in FIGS. 1 to 4, the powder molding apparatus according to the embodiment of the present invention molds ceramic as powder F in the same manner as described above. When,
A mold 2 into which the powder F is placed, and a powder F inserted into the mold 2
, And an upper pressing mechanism 20 and a lower pressing mechanism 30 for applying pressure to the upper and lower punches 4, 5, and a powder F. And a powder supply unit 60 for supplying the powder F to the concave portion of the mold 2. ing.

The mold 2 has a recess 3 into which the powder F is put, and the recess 3 is penetrated. One opening of the recess 3 is an upper opening 3a and the other is a lower opening. Opening 3b
And is arranged at the center of the machine base 1. The recess 3 is formed in a columnar shape, whereby the molded body is also formed in a columnar shape. The mold 2 is formed in a point-symmetrical shape with respect to the center axis P (the center axis of the recess 3) of the mold 2 extending in the pressing direction of the punch. In the embodiment, it is formed in a columnar shape, and is supported by the base member 1a.

The upper punch 4 is supported by a drive block 16 supported on the machine base 1 above and below the mold 2 so as to be vertically movable, and is supported by the drive block 16 to be vertically movable. The upper pressurizing mechanism 20 includes a main pressurizing unit 21 and a sub-pressurizing unit 25 that can apply different pressing forces. As shown in FIG. 3, the main pressurizing unit 21 applies a pressing force to the upper punch 4 by moving the drive block 16 by a drive mechanism 24 such as a toggle mechanism driven by a motor 22 and a chain transmission mechanism 23. The sub-pressurizing section 25 moves the upper punch 4 with respect to the drive block 16 by a screw mechanism 28 which is driven by a motor 26 and a chain transmission mechanism 27 to move up and down as shown in FIGS. To apply a pressing force. Then, the main pressure unit 21 and the sub pressure unit 2
5 can be appropriately combined to drive the upper punch 4 to apply a required pressing force. In the embodiment, the main pressurizing unit 21 can output a pressing force of 50 tons.

The lower punch 5 is provided on the machine base 1 below the mold 2 so as to be vertically movable. As shown in FIGS. 2 and 3, the lower pressurizing mechanism 30 includes a hydraulic cylinder device 31 that moves a piston 32 up and down, and the piston 32 is linked to the lower punch 5. The hydraulic path of the hydraulic cylinder device 31 is provided with a pressure control valve 33 that receives an electric signal and that can change the set pressure. The lower punch 5 is pressed by the pressurization of the upper punch 4 so that the pressing force reduces the set pressure. When it exceeds, the lower punch 5 can be pressurized while keeping the oil at a constant value by leaking the oil. At the bottom dead center of the lower punch 5, a stopper (not shown) is provided to stop the downward movement of the lower punch 5 so that no load is applied to the piston 32. It is designed to respond to pressure. In the embodiment, at the bottom dead center of the lower punch 5, a pressing force of 50 tons by the main pressurizing unit 21 can be received.

The vibrating means 40 performs vibration for applying a uniform vibration to the entire periphery of the mold 2 in which the powder F is placed, and is provided outside the mold 2 in an equiangular relationship and is driven simultaneously. And a plurality of vibration sources. For more information,
As shown in FIGS. 5A and 5B, an inner ring body 41 having a plurality of concave portions 42 and convex portions 43 which are fitted to the outside of the mold 2 and are alternately formed in an equiangular relationship and arranged in a row. Outside the concave portion 42 and the convex portion 43 of the inner ring body 41 and
And a plurality of balls 44, which are arranged so as to be able to roll, and which are rolled at the same time, and
Outer ring body 45 for rotating the plurality of balls 44 with respect to the plurality of concave portions 42 and the plurality of convex portions 43 while being rotated about the central axis P, and a rotating mechanism 50 for rotating the outer ring body 45. It is comprised including. Recess 42
Is formed by a hole provided on the outer circumference of the inner ring body 41, and the projection 43 is formed by the outer circumference of the inner ring body 41 between the holes. The inner ring body 41 has an outwardly inclined surface 46 for supporting the ball 44 from below on the outer periphery thereof. On the other hand, the outer ring body 45 has an inward surface 47 which faces the outwardly inclined surface 46 of the inner ring body 41 at the inner periphery thereof, presses the ball 44 from above and presses the ball 44 on the outwardly inclined surface of the inner ring body 41. have. The rotation mechanism 50 includes an electric motor 51 fixed to the base member 1a and the electric motor 51.
And a friction roller 52 that is rotatably elastically contacted with the outer ring body 45 and rotates the outer ring body 45 by rotation of the motor 51.

Next, the powder supply section 60 will be described in detail. As shown in FIGS. 1, 2, 4, and 6 (a) and 6 (b), in the powder supply unit 60, a base plate 61 opens the upper opening 3 a of the recess 3 of the mold 2. Let's open the top 3
It is formed in a rectangular plate shape having a sliding surface 61a extending around the periphery a and allowing the powder F to be slid and put into the recess 3.
A hopper 62 stores the powder F and feeds the powder F. The hopper 62 is provided on the side of the machine base 1. A tank 63 provided in the machine base 1 has a storage space 63a for temporarily storing the powder F flowing down from the hopper 62 via a hose 62a, and has a shutter 64 that is opened and closed. When the storage space 63a
The powder F is caused to flow down, and the flow is stopped when the shutter 64 is closed. As shown in FIG. 6B, the tank 63 has an outlet 65 for the powder F on the lower surface, and is formed so that the cross-sectional area of the storage space 63a decreases toward the lower surface. As shown in FIG. 4, a window 66 closed with a transparent body is provided on a side portion, so that the presence of the powder F in the storage space 63 a of the tank 63 can be visually recognized. The shutter 64 is shown in FIG.
As shown in (b), the outlet 65 can be opened and closed by the tank 63.
It is provided within. At the top of the tank 63 is a rod 67
An air cylinder 68 provided with a piston 68a linked to the shutter 64 via the air cylinder 68 is provided, and the shutter 64 can be opened and closed by the operation of the air cylinder 68.

In the powder supply section 60, reference numeral 70 denotes a carrier, which is moved along the sliding surface 61a of the base plate 61 and flows down from the tank 63 as shown in FIG. Receiving position X and powder F received
At the loading position Y where it is slid on the sliding surface 61a of the base plate 61 and conveyed into the recess 3 through the upper opening 3a of the mold 2.
Position. As shown in FIG. 6B, the transfer body 70 is formed in a rectangular box shape, and has an opening 71 in which the lower surface side is open and the upper surface faces the outlet 65 of the tank 63. Further, as shown in FIG. 4, a detection switch 72 for detecting the upper end of the received powder F is attached to the carrier 70, and the detection switch 72 is required when the detection switch 72 detects the upper end of the powder F. Is controlled to close the shutter 64 on the assumption that the powder F has been received by the carrier 70. As shown in FIGS. 6B and 8A and 8B, reference numeral 73 denotes a scraping plate, which is provided on the carrier 70 so as to slide on the sliding surface 61a of the base plate 61. Is moved into the recess 3 of the mold 2 in the process of returning from the input position Y to the receiving position X, and the sliding surface 61a
The upper-level powder F is scraped off to flatten the upper surface of the powder F in the recess 3. The scraping plate 73 includes the carrier 70.
The sliding edge 61a is slidably provided on the open peripheral edge 74 on the lower surface side of the mold, and the portion 73a on the mold 2 side mainly performs a scraping function. The scraping plate 73 is formed of a wooden plate (balsa material in the embodiment). Reference numeral 75 denotes a moving mechanism for moving the carrier 70. The moving mechanism 75 includes an air cylinder device 76
, A cylinder 76a fixed to the end of the base plate 61,
And a piston 76b for moving the piston 76 to two positions of the receiving position X and the closing position Y described above. As shown in FIG. 3, reference numeral 77 denotes a pair of guide rails for guiding the movement of the carrier 70, which are provided on the base plate 61 along the moving direction of the carrier 70.

In FIG. 3, reference numeral 80 denotes a control unit, which is an electric motor 51 of the rotating mechanism 50 of the vibrating means 40, a motor 22 of the main pressing unit 21 of the upper pressing mechanism 20, and a control unit of the upper pressing mechanism 20. The motor 26 of the sub-pressurizing unit 25, the hydraulic cylinder device 31 of the lower pressurizing mechanism 30, the air cylinder 68 of the shutter 64 provided in the tank 63 of the powder supply unit 60,
The air cylinder device 76 of the moving mechanism 75 for moving the carrier 70 is controlled. Next, the control of the control unit 80 will be described. This control is basically performed by the powder supply unit 6.
0 to control the amount of powder F necessary for molding
8 (FIG. 8 (b), FIG. 9) is put into the recess 3 of the mold 2, and while the powder supply unit 60 is being driven, that is, the carrier 70 is moved from the receiving position X. When the powder F reaches the charging position Y, the powder F is put into the recess 3 of the mold 2, and then the receiving position X
Until the vibration returns, the drive of the electric motor 51 of the rotation mechanism 50 of the vibrating means 40 is controlled to vibrate to apply uniform vibration to the entire periphery of the mold 2. Thereafter, the motor 22 of the main pressurizing unit 21 of the upper pressurizing mechanism 20, the motor 26 of the sub-pressurizing unit 25 of the upper pressurizing mechanism 20, and the hydraulic cylinder device 31 of the lower pressurizing mechanism 30 are drive-controlled to mold. A punch is inserted into the recess 3 of the second 2, and the powder F that has been inserted is pressed. Then, the divided powder Fa is put into the concave portion 3 of the mold 2, a vibration is applied to apply a uniform vibration to the entire periphery of the mold 2, and the process of pressing and molding is defined as one cycle. A cycle is performed to form a compact by successively overlapping the divided powders Fa. In addition, control for sequentially increasing the pressing force in each cycle is performed. As shown in FIG. 7, the set pressure of the pressure control valve 33 (FIG. 2) is changed stepwise in response to an electric signal from the control unit 80. The pressure in the last cycle is maximized. In the embodiment, the maximum pressurizing force is output by the main pressurizing unit 21 at 50 tons.

Therefore, a case where a compact is molded by the powder F molding apparatus according to this embodiment will be described with reference to the steps shown in FIGS. 8 and 9 and the flowcharts shown in FIGS. 10 and 11. In this molding step, the method for molding powder according to the embodiment of the present invention is realized.
First, as shown in FIGS. 8A and 9B and FIG.
The hydraulic cylinder device 31 of the lower pressurizing mechanism 30 is driven, and the lower punch 5 is moved to the position above the recess 3 of the mold 2 where a space for the volume of the divided powder Fa just entered is formed. (1-1). Next, FIG. 4 and FIG.
The electric motor 51 of the rotating mechanism 50 of the vibrating means 40 shown in (b) is driven to vibrate the mold 2 (1-2). In this state, the powder supply unit 60 is driven to supply the powder F (1-
3). Here, the driving of the powder supply unit 60 will be described with reference to FIG.
This will be described in detail with reference to the flowchart shown in FIG. First,
As shown in FIG. 6B, the shutter 64 of the tank 63 is opened (2-1). In the tank 63, the hopper 62
The powder F flows down through the hose 62 a and is temporarily stored, and the stored powder F flows down from the outlet 65 of the tank 63 to the carrier 70 and accumulates on the base plate 61. . In the carrier 70, the upper end of the powder F received by the detection switch 72 is detected. When this is detected (2-2 YES), the shutter 64 is closed (2-3).
As a result, a substantially fixed amount is received in the carrier 70.

Next, when there is a supply command signal from the control unit 80 (2-4 YES), the air cylinder device 76 of the moving mechanism 75 is driven to move the carrier 70 from the receiving position X to the loading position Y.
(2-5). As a result, as shown in FIG. 8A, the powder F is moved along the sliding surface 61a of the base plate 61 by the movement of the carrier 70, and the feeding position Y
, The powder F is put into the recess 3 through the upper opening 3a of the mold 2. Also. This input position Y is detected by a detection sensor (not shown) (2-6 YES), whereby
The carrier 70 moves backward toward the receiving position X and returns (2-
7). In this case, as shown in FIG.
In the process of returning from the input position Y to the receiving position X,
3 is placed in the recess 3 of the mold 2 and scrapes off the powder F above the sliding surface 61a to flatten the upper surface of the powder F in the recess 3. As a result, as shown in FIG. 9A, one divided powder Fa is put in the upper part of the recess 3 of the mold 2.

Then, as shown in FIG. 6, when the carrier 70 reaches the receiving position X, it is detected by a detection sensor (not shown) (2-8 YES), whereby the carrier 70 is moved to the receiving position X. Stopped. Until the next supply command signal is received (2-4), the shutter 64 is opened and closed to receive a substantially constant amount of the powder F into the carrier 70, and the next preparation (2-1, 2-2) is performed. , 2-3). When the carrier 70 reciprocates, a tank 63 for temporarily storing the powder F is provided, the carrier 70 is separated from the tank 63, and only the carrier 70 moves. Since the hose does not move, the hose 62a does not move, so that it does not easily interfere with the surrounding parts, so that the surrounding space can be widened, which increases the degree of freedom in device design. Can be Further, in the related art, since the hose also moves, the powder F may not flow down sufficiently, so that a required molding amount of the powder F may not be reliably ensured. Since the powder F is caused to flow down to the carrier 70 via the tank 63 for temporarily storing the powder F without directly flowing down from the hose 62a to the carrier 70, the required amount of powder can be reliably received and supplied. Become like

As shown in FIG. 10, when the powder supply is completed (1-4), the electric motor 51 of the rotating mechanism 50 of the vibration means 40 is stopped by a command from the control unit 80, and The swing stops. Thus, the mold 2 is vibrated during the powder supply period. Therefore, by this vibration,
The powder F moves into the recess 3 while slightly moving in all directions, and finely moves in the recess 3, so that the powder F is uniformly dispersed in the recess 3. In particular, as shown in FIG.
As a result, when the outer ring body 45 is rotated, the plurality of balls 44 are rolled with respect to the plurality of concave portions 42 and the convex portions 43 of the inner ring body 41, and the balls 44 sequentially enter and exit the irregularities. Thus, a plurality of vibrating sources provided at an equal angular relationship and driven simultaneously at the outside of the mold 2 are formed. Therefore, a uniform vibration is applied to the entire periphery of the mold 2 in which the powder F is placed, and the vibration is reduced. And the powder F is evenly distributed over the entire circumference without dispersing the powder F more uniformly.

Next, as shown in FIG. 10, when the vibration stops (1-5), it is determined whether or not the final pressure is applied (1-5).
6) When the final pressing is not performed (1-6 NO), the main pressing unit 21 and the sub-pressing unit 25 of the upper punch 4 operate in cooperation to move the upper punch 4, and FIG. As shown in (1), a required pressure equal to or less than the maximum pressure is applied to the upper punch 4. Thus, the divided powder Fa is pressed and formed. In this case, a uniform vibration is applied to the entire periphery of the mold 2 in which the powder F is placed by the vibrating means 40, and the powder F is uniformly dispersed. When the pressing by the upper punch 4 is completed, the main pressing unit 21 and the sub pressing unit 25 cooperate to retreat the upper punch 4. Then, as shown in FIG. 9C, the hydraulic cylinder device 31 of the lower pressurizing mechanism 30 is driven again, and the lower punch 5 is placed on the upper side of the concave portion 3 of the mold 2 for one divided powder. It is located at a position where a space for the volume that the body Fa just enters is formed (1-1). Next, as shown in FIG. 9D, the electric motor 51 of the rotating mechanism 50 of the vibrating means 40 is driven to vibrate the mold 2 in the same manner as described above (1-2), and the powder supply unit is started. 60 to supply the powder F (1-3, 1
-4, 1-5).

Next, it is determined whether or not the final pressure is applied (1).
-6), when it is not the final pressurization (1-6 NO), the main pressurizing portion 21 and the sub-pressurizing portion 25 of the upper punch 4 operate in cooperation with each other, as shown in FIG. The upper punch 4 is moved by a required pressing force equal to or less than the maximum pressing force.
Is given a pressing force. As a result, the put divided powder Fa is pressed and molded together with the molded body of the divided powder Fa that has been pressed and molded earlier. Also in this case, the vibration means 40 applies uniform vibration to the entire periphery of the mold 2 in which the powder F is placed, and the powder F is uniformly dispersed, so that the molding is performed uniformly. When the pressing by the upper punch 4 is completed, the main pressing unit 21 and the sub pressing unit 25 cooperate to retreat the upper punch 4. Then Figure 9
As shown in (f), the hydraulic cylinder device 31 of the lower pressurizing mechanism 30 is driven again, and the lower punch 5 is placed on the upper side of the concave portion 3 of the mold 2 so that the divided powder Fa for one time is just discharged. It is located at a position where a space corresponding to the volume to enter is formed (1-1).

In this way, the divided powder Fa is sequentially supplied, and the divided powder Fa is molded together with the molded body of the divided powder Fa which has been previously pressed and molded (1-1, 1-2, and 1-2). 1-3,
1-4, 1-5). Then, it is determined whether or not the final pressing is performed (1-6). When the final pressing is performed (1-6 YES), the main pressing portion 21 and the sub pressing portion 25 of the upper punch 4 cooperate. The upper punch 4 is moved with the maximum pressing force (50 tons in the embodiment) to apply the pressing force to the upper punch 4 as shown in FIG. 9 (g) (1-8). As a result, the inserted divided powder Fa is pressed and molded together with the molded body of the divided powder Fa that has been previously pressed and molded, and finish molding is performed by the maximum pressing force. Thereafter, the main pressurizing unit 21 and the sub-pressurizing unit 25 cooperate to retreat the upper punch 4, and then, as shown in FIG.
As shown in the figure, the hydraulic cylinder device 3 of the lower pressure mechanism 30
1 is driven, the lower punch 5 is raised, and the molded body is extruded above the mold 2 (1-9). The molded body is taken out by hand or taken out using a take-out device or the like. Thus, the molding of the molded body is completed.

This compact S (FIG. 9 (h)) is a divided powder F obtained by dividing an amount of powder F necessary for molding the compact.
a is put into the mold 2, a vibration is applied to apply a uniform vibration to the entire periphery of the mold 2, and the process of molding by pressing is one cycle. This cycle is performed a plurality of cycles to sequentially overlap the divided powders Fa. That is, since the vibrating means 40 applies uniform vibration to the entire periphery of the mold 2 in which the divided powder Fa is placed, and the divided powder Fa is uniformly dispersed. Since the uniformly molded divided molded bodies are stacked to form one molded body, the powder F can be further molded as compared with the conventional case where the whole is molded at once. And the quality of the product is improved.

FIG. 12 shows another example of the vibration means 40. This is because the inner ring 41 is fitted to the outside of the mold 2 and is constituted by a saw-tooth gear, and the plurality of recesses 42 and protrusions 4 are alternately formed and arranged in an equiangular relationship by the gear.
3. The rotation mechanism 50 is constituted by a belt transmission mechanism 53. The belt transmission mechanism 53 is provided with a pulley 54 on the rotation shaft of the electric motor 51, and the pulley 54
And the outer ring body 45 and a belt 55. FIG. 13 shows another example of the vibration means 40.
In this case, the inner ring body 41 which is fitted on the outside of the mold 2 is formed of a saw-tooth gear, and a plurality of concave portions 42 and convex portions 43 which are alternately formed and arranged in an equiangular relationship by the gear are formed. Make up. Further, the rotation mechanism 50 is connected to the gear transmission mechanism 57.
It consists of. The gear transmission mechanism 57 is provided with a driving gear 58 on the rotating shaft of the plurality of electric motors 51 and the outer ring body 45.
And a driven gear 59 meshing with the main driving gear 58 is provided.

In the above embodiment, the pressure in each cycle is sequentially increased. However, the present invention is not limited to this. As shown in FIG. (For example, 50 tons)
The pressure in other cycles may be determined as appropriate, such as being constant (for example, 5 tons). Also, the mold 2 by the vibrating means 40
Is applied during the powder supply period, but is not necessarily limited thereto, and may be performed during the pressurization period or may be changed as appropriate. Further, the device according to the above embodiment is a device provided with one mold 2, but is not necessarily limited to this, and as shown in FIG.
A so-called line transfer type, in which a plurality of movable molds 2 are provided and moved, or a so-called circle transfer type, in which a plurality of movable molds 2 are provided and moved as shown in FIG. You can change it. Furthermore, it goes without saying that the present invention can be applied not only to ceramic powder before firing but also to various powders F.

[0032]

As described above, according to the powder molding method and the powder molding apparatus of the present invention, vibration is applied to apply uniform vibration to the entire periphery of the mold. The powder can be dispersed in the recess while finely moving in all directions. In particular, since uniform vibration is applied to the entire circumference of the mold, the vibration does not become localized as in the conventional case, but occurs evenly around the entire circumference, so that the powder can be more evenly dispersed. it can. Therefore, the molded body can be uniformly molded, and the quality of the molded body can be greatly improved.
Then, the mold is formed in a point-symmetrical shape, a plurality of vibration sources are provided outside the mold in an equiangular relationship, and the vibration sources are simultaneously driven to apply uniform vibration around the entire periphery of the mold. In this case, uniform vibration can be reliably applied to the entire periphery of the mold, and the powder can be reliably and uniformly dispersed.

Further, a divided powder obtained by dividing an amount of powder necessary for molding a molded body is put into a mold, and vibration is applied while applying uniform vibration to the entire periphery of the mold, and pressure is applied. In the case where the molding process is one cycle and the divided powders are successively overlapped and molded by performing the plurality of cycles, uniform vibration is applied by vibrating means to the entire periphery of the mold in which the divided powders are placed. In addition, since the divided powders can be uniformly dispersed and uniformly molded, and the uniformly molded divided molded bodies are overlapped to form one molded body, the entire body can be molded at once as in the conventional case. As compared with the case, the powder can be made more uniform and the quality of the product can be improved. Further, when the pressing force in the final cycle is maximized, the finish molding can be performed by the maximum pressing force. Furthermore, even when the pressing force of each cycle is sequentially increased, it is possible to press the formed divided powder together with the molded body of the divided powder that has been previously pressed and formed, and to perform molding by the maximum pressing force. Finish molding can be performed.

In the powder molding apparatus of the present invention,
The powder supply unit has a storage space for temporarily storing the powder flowing down from the hopper and has a shutter that can be opened and closed.The powder in the storage space flows down when the shutter is opened, and the powder flows down when the shutter is closed. A tank to be stopped, a receiving position for receiving the powder that is moved along the sliding surface of the base plate and flows down from the tank, and slides the received powder onto the sliding surface of the base plate to convey and mold. And a transporter positioned at two positions of the loading position for loading into the recess from the upper opening, when the transporter reciprocates,
Since the carrier is separated from the tank and only the carrier moves, and the hose from the hopper does not move as in the past, the hose does not move, so it is less likely to interfere with surrounding parts, The surrounding space can be widened, and the degree of freedom in device design can be increased accordingly. Further, in the related art, the powder may not flow down sufficiently because the hose also moves, so that the required molding amount of the powder may not be reliably secured. Without letting it flow directly to the carrier
Since the powder is caused to flow down to the carrier via the tank for temporarily storing the powder, it is possible to reliably receive and supply the required amount of powder. Further, in the case where a detection switch for detecting the upper end portion of the received powder on the carrier and performing control to close the shutter upon detection of the required powder as being received by the carrier is provided, The required amount can be reliably transported.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a powder molding apparatus according to an embodiment of the present invention.

FIG. 2 is a front view showing a powder molding apparatus according to the embodiment of the present invention.

FIG. 3 is a side view showing a powder molding apparatus according to the embodiment of the present invention.

FIG. 4 is a front sectional view showing a powder molding apparatus according to an embodiment of the present invention.

5A and 5B show a configuration of a vibrating means of the powder molding apparatus according to the embodiment of the present invention, wherein FIG. 5A is a plan view and FIG. 5B is a front view.

FIGS. 6A and 6B show a main configuration of a powder supply unit of the powder molding apparatus according to the embodiment of the present invention, wherein FIG. 6A is a plan view and FIG.

FIG. 7 is a graph showing how to apply pressure to a mold in each cycle of the powder molding apparatus according to the embodiment of the present invention.

FIG. 8 is a process chart showing the operation of the powder supply unit of the powder molding device according to the embodiment of the present invention.

FIG. 9 is a process chart showing the operation of the powder molding apparatus according to the embodiment of the present invention.

FIG. 10 is a flowchart showing the operation of the powder molding apparatus according to the embodiment of the present invention.

FIG. 11 is a flowchart illustrating the operation of a powder supply unit of the powder molding apparatus according to the embodiment of the present invention.

FIG. 12 is a view showing another example of the vibrating means of the powder molding apparatus according to the embodiment of the present invention.

FIG. 13 is a view showing still another example of the vibrating means of the powder molding apparatus according to the embodiment of the present invention.

FIG. 14 is a graph showing another method of applying pressure to the mold in each cycle of the powder molding apparatus according to the embodiment of the present invention.

FIG. 15 is a diagram schematically showing a powder molding apparatus according to another embodiment of the present invention.

FIG. 16 is a diagram schematically showing a powder molding apparatus according to another embodiment of the present invention.

FIG. 17 is a perspective view showing an example of a conventional powder molding apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 machine base 1a base member F powder 2 mold 3 recess 3a upper opening 3b lower opening 4 upper punch 5 lower punch 16 drive block 20 upper pressing mechanism 21 main pressing section 22 motor 23 chain transmission mechanism 24 driving mechanism Reference Signs List 25 Sub-pressurizing unit 26 Motor 27 Chain transmission mechanism 28 Screw mechanism 30 Lower pressurizing mechanism 31 Hydraulic cylinder device 32 Piston 33 Pressure control valve 40 Vibration means 41 Inner ring body 42 Depression 43 Convex part 44 Ball 45 Outer ring body 46 Outwardly inclined surface 47 Inward surface 50 Rotary mechanism 51 Electric motor 52 Friction roller 60 Powder supply unit 61 Base plate 61a Sliding surface 62 Hopper 62a Hose 63 Tank 63a Storage space 64 Shutter 65 Exit 66 Window 67 67 Rod 68 Air cylinder 68a Piston 70 Carrier 71 Opening 72 Detector Pitch 73 scraping plate 74 open peripheral edge 75 moving mechanism 76 the air cylinder unit 76a cylinder 76b piston 77 guide rail 80 control unit

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Koji Ohata 71-1 Tsuno, Oyama, Isawa-machi, Isawa-gun, Iwate Pref. 71-1 within Isawa Tsushin Co., Ltd. (72) Inventor Hitoshi Kawamura 1-6-24 Jonan, Yonezawa City, Yamagata Prefecture Inside Yoshiki Industry Co., Ltd. Yoshiki Kogyo Co., Ltd. (72) Inventor Hiromi Sato 1-6-24, Jonan, Yonezawa-shi, Yamagata Prefecture Yoshiki Kogyo Co., Ltd. Ryosuke Hashimoto Inventor Ryosuke Hashimoto 740, Onagashima, Kawanishi-cho, Higashi-Okita-gun, Yamagata Prefecture Inside Webback Machinery Co., Ltd. Daisuke Takahashi, 740 Waveback Machinery Co., Ltd. (72) Inventor Daisuke Takahashi 740 Waverback Machinery, Onagashima, Kawanishi-cho, Higashi-Okita-gun, Yamagata Prefecture F-term (reference) EB17 4G054 AA05 AB01 AC04 BA07 BA29 DA06 4G055 AA07 AB01 AC01 AC05 CA01 CA19 CA27

Claims (13)

[Claims] 1. A method for molding a powder, comprising placing a powder in a recess of a mold, inserting a punch into the recess of the mold, and pressing the powder into the compact to form a compact. A method for forming a powder, comprising applying vibration to apply uniform vibration around the entire periphery of a mold. 2. The mold is formed in a point-symmetrical shape with respect to a center axis of the mold extending in the pressing direction of the punch, and a plurality of vibration sources are equiangularly arranged outside the mold. Provided,
2. The powder molding method according to claim 1, wherein said vibration source is simultaneously driven to perform vibration for applying uniform vibration to the entire periphery of the mold. 3. A divided powder obtained by dividing an amount of powder necessary for molding the molded body is put into a mold, and vibration is applied while applying uniform vibration to the entire periphery of the mold, and pressure is applied. The powder molding method according to claim 1, wherein the molding step is performed in a single cycle, and the cycle is performed a plurality of times to form the divided powders by sequentially overlapping. 4. The method according to claim 3, wherein the pressure in the final cycle is maximized. 5. The method according to claim 3, wherein the pressing force of each cycle is sequentially increased. 6. A powder comprising a mold having a recess having an upper opening into which the powder is placed, and a punch inserted into the recess of the mold and pressing the powder to form a compact. An apparatus for molding a body, comprising: a vibrating means for performing vibration for applying uniform vibration to the entire periphery of a mold in which the powder is placed. 7. The mold is formed in a point symmetrical shape on the outside with respect to a center axis of the mold extending in the pressing direction of the punch, and the vibrating means is equiangularly arranged on the outside of the mold. 7. The powder molding apparatus according to claim 6, comprising a plurality of vibration sources provided and driven at the same time. 8. The mold is formed in a point-symmetrical shape on the outside with respect to a center axis of the mold extending in the pressing direction of the punch, and the vibrating means is equiangularly arranged on the outside of the mold. A plurality of concave portions and convex portions which are alternately formed and arranged in a row, and a plurality of concave portions and convex portions which are arranged outside of the concave portions and convex portions and which are arranged in an equiangular relationship so as to be able to roll and are simultaneously rolled. A ball, a ring body holding the plurality of balls and rotating about the central axis to roll the plurality of balls with respect to the plurality of recesses and protrusions, and rotating the ring body 7. The powder molding apparatus according to claim 6, comprising a rotating mechanism. 9. The powder molding apparatus according to claim 6, wherein a powder supply unit for supplying powder is provided in the recess of the mold. 10. A sliding member in which said powder supply portion extends around said upper opening by opening an upper opening of said concave portion of said mold so that powder can be slid into said concave portion. A base plate having a surface, a hopper for storing the powder and feeding the powder,
A tank having a storage space for temporarily storing the powder flowing down from the hopper and having a shutter that can be opened and closed; a tank that flows down the powder in the storage space when the shutter is opened and stops flowing down when the shutter is closed; And a receiving position for receiving the powder that is moved along the sliding surface of the base plate and flows down from the tank, and slides the received powder on the sliding surface of the base plate to convey the powder. A carrier which is positioned at two positions of a loading position for loading into the recess from the upper opening of the mold, and which is slidably provided on the sliding surface of the base plate and which is received from the loading position. In the process of moving back to the position, the scraper is moved into the recess of the mold to scrape the powder above the sliding surface to flatten the upper surface of the powder in the recess, and the carrier is moved. And a moving mechanism for moving Molding apparatus of the powder according to claim 9 wherein. 11. The transfer body is formed in a rectangular box shape having an opening on the lower surface side and an opening on the upper surface facing the outlet of the tank. 11. The powder molding apparatus according to claim 10, further comprising a detection switch for performing control to close the shutter assuming that the required powder is received by the transporting body. 12. The mold is arranged so as to penetrate through the recess of the mold, with one opening of the recess being an upper opening and the other being a lower opening, and being inserted from the upper opening of the recess. An upper punch, a lower punch inserted from a lower opening of the recess, an upper pressing mechanism for applying a pressing force to the upper punch, and a lower pressing mechanism for applying a pressing force to the lower punch. The powder molding apparatus according to claim 6, wherein the powder molding apparatus comprises: 13. The powder molding apparatus according to claim 12, wherein said upper pressurizing mechanism is provided with a main pressurizing section and a sub-pressurizing section capable of applying different pressing forces. .