JPH0970696A - Compacting die device of powders granule - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compacting die device of powders granule having a die where a material of powders granule is filled uniformly, and the arrangement of each cavity is made so as to improve the load efficiency of a setter. SOLUTION: In a 2nd direction H2 orthogonally crossing to a 1st direction H1, cavities 30 are arranged in a straight line like on a 1st pitch P1, plural lines L1, L2, L3, L4 are formed, further, these lines L1, L2, L3, L4 are arranged by a 2nd pitch P2 in the 1st direction H1. Among these lines L1, L2, L3, L4, the relative position of the cavities 30 of mutual adjoining lines is displaced to the 2nd direction H2 by the half size of the 1st pitch P1. Further, because the long side W of the cavity 30 is made parallel with the 1st direction H1, the wall thickness t formed between the long sides of mutual adjoining cavities is made larger than the short side (d) of the cavity 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder molding die apparatus capable of obtaining a large number of molded products from a powder material at a time, for example, when a small magnet or the like is manufactured by a dry method. Is a mold for powder molding having a mold in which each cavity is arranged so that the powder material is uniformly filled, and further, the loading efficiency of the setter that is conveyed to the subsequent process after molding is improved. It relates to the device.

[0002]

2. Description of the Related Art When a magnet or the like is manufactured from a powder material by a dry method, a powder molding die device for pressing a powder material filled in a cavity with a press is used for molding the powder material. in use. Some powder molding die apparatuses include a filling means for filling a powder material into a cavity provided in the die, and one of such filling means is a dropping type. FIG. 8 shows a diagram showing the main part of the filling means by the dropping method.

Here, the outline of the structure of the filling means by the dropping method will be described with reference to FIG. A guide groove 53 is formed by a guide plate 52 on the die mounting base 51 of the powder molding die device. Further, a mold 70 provided with a large number of cavities 71 is fitted in a part of the guide groove 53 of the mold mounting base 51. Further, a driving arm 55 is attached to the powder container 54 that slides in the guide groove 53, and the driving force of a driving source (not shown) is transmitted to the powder container 54 via the driving arm 55. Powder container 54
Can slide in the guide groove 53 and reciprocate in the I direction.

The powder container 54 is a frame body which is open in the vertical direction and is divided by a plate 58 into a first chamber 54a and a second chamber 54b. The powder material 60 is supplied to the first chamber 54a from above by a powder material supply device (not shown), and a rake 56 for preventing a crosslinking phenomenon of the supplied powder material 60 is provided. There is. Further, an air cylinder 57 for driving the rake 56 is arranged in the second chamber 54b, and is fixed to the plate 58.

In order to fill the powder material 60 into the cavity 71 provided in the mold 70 by the above-mentioned filling means, the powder container 54 supplied with the powder material 60 is placed in the first chamber 54a. Then, the mold 70 is moved in the direction I along the guide groove 53. At this time, since the powder material 60 in the first chamber 54a is pushed out to the plate 58, the powder material 60 is also first
While being held in the chamber 54a, it moves toward the die 70.
After that, when the powder container 54 moves over the mold 70, the powder material 60 falls into the cavity 71 by its own weight. Therefore, the cavity 71 provided in the mold 70 should be filled with the powder material 60. You can Then, by moving the powder container 54 in the direction opposite to the I direction and reciprocating it, the cavity 71 can be more reliably filled with the powder material 60. When a material having poor fluidity (for example, ferrite particles) is used as the powder material 60, a cross-linking phenomenon of the powder material 60 frequently occurs. The rake 56 is being driven.

Powder material 6 filled in the cavity 71
0 becomes a molded product by pressing by the press, and the molded product is loaded on the setter, conveyed into the sintering furnace, and sintered for a long time. By the way, when the size of the magnet to be manufactured is small, in consideration of productivity, a large number of cavities 71 are provided in the mold 70, and a so-called “multi-piece cutting” is performed.
Has been implemented. At this time, the cavities 71 in the die 70 are arranged in a grid pattern as shown in FIG. 8 in view of the uniformity of the pressing force applied to the cavities 71 and the loading efficiency of the molded articles loaded on the setter. It is arranged.

[0007]

However, when the cavities 71 are arranged in a grid pattern, as shown in FIG. 9, in the moving direction I of the powder container 54, a region where the cavities 71 do not exist in the mold 70. Since R exists with a certain width, the powder material 6 in the powder container 54
A difference in the degree of decrease of 0 causes a wave-like portion (hereinafter, referred to as “waveform”) 80 to be generated in the powder material 60, and the powder is removed from all the cavities 71 provided in the mold 70. There is a problem that the material 60 cannot be filled uniformly.

Therefore, it is effective to reduce the width of the region R in order to prevent the corrugation 80 from being generated in the powder material 60, but it is limited to narrow the width because of the durability of the mold 70. Was insufficient to prevent the generation of the waveform 80. Further, if the mold 70 is fitted to the mold mount 51 so that the moving direction I of the powder container 54 and the region R are angled,
In the moving direction I of the powder container 54, it is possible to eliminate the region where the cavity 71 does not exist in the mold 70, but in this case as well, the powder material 60 in the powder container 54 is eliminated.
The difference is in the degree of decrease in the temperature, and the powder material 60 does not easily fall into the four corners of the cavity 71.
It was not possible to uniformly fill the powder material 60 into all the cavities 71 provided in the above.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and in a powder molding die apparatus provided with a filling means for filling a powder material into a cavity by a dropping method, The powder material is evenly filled, and further, the loading efficiency of the setter is improved,
An object of the present invention is to provide a powder molding die device having a die in which each cavity is arranged.

[0010]

In order to achieve this object, a powder molding die apparatus according to the present invention comprises a powder container having an opening on the upper surface of a die provided with a cavity and a bottom surface. A mold apparatus for powder molding, comprising: a filling unit that slides in a direction to drop the powder material in the powder container into the cavity and fill the cavity. A plurality of rows are formed by linearly arranging at a pitch of a first pitch in a second direction orthogonal to the direction, and the rows are arranged at a pitch of a second pitch in the first direction, and the rows of adjacent rows are adjacent to each other. By arranging the rows so that the relative positions of the cavities are displaced in the second direction by a predetermined distance, the cavities provided in the mold are arranged.

The predetermined distance is half the first pitch. Further, the cavity is formed in a rectangular shape, and a long side of the cavity is parallel to the first direction.
Finally, the wall thickness formed between the long sides of the adjacent cavities is larger than the short side of the cavities.

In the powder molding die apparatus of the present invention having such a structure, a large number of cavities are arranged in the die, and a large number of molded articles can be obtained from the powder material at a time. To fill the powder material into the cavity provided in the mold, slide the powder container to which the powder material is supplied in the first direction on the upper surface of the mold to open the powder container. A filling means for dropping the powder material into the cavity from the bottom and filling the cavity is used.

The arrangement of the cavity in the mold is determined according to the following procedure. First, it is assumed that a plurality of rows are formed by arranging cavities linearly at intervals of a first pitch in a second direction orthogonal to the first direction. Next, in the first direction, such rows are arranged at intervals of the second pitch. Finally, the relative positions of the cavities in the adjacent rows are moved and arranged so that the relative positions of the cavities are displaced in the second direction by a predetermined distance of, for example, half the first pitch. The arrangement of the cavities is determined by the above procedure, and a large number of cavities are provided in the mold, and the arrangement is a so-called zigzag pattern.

That is, since the cavities of the adjacent rows are located in the first direction between the cavities adjacent to each other in a row, the powder material is filled in the cavities by using the above-mentioned filling means. Then, the powder material moving in the first direction between the adjacent cavities without being dropped into the cavities in a certain row is dropped into the cavities in the adjacent row. Therefore, the waveform generated in the powder material when the cavities forming a row are filled with the powder material can be eliminated when the cavities forming the adjacent rows are filled with the powder material, Differences in the degree of decrease of the powder material in the powder container are less likely to occur, and the powder material can be uniformly filled in all the cavities provided in the mold.

When the cavity is formed in a rectangular shape, the long side of the cavity is parallel to the first direction and the longitudinal direction of the cavity and the first direction in which the powder material moves are in the same direction. This facilitates the powder material to be dropped into the four corners of the cavity. Furthermore, if the wall thickness formed between the long sides of adjacent cavities is made larger than the short sides of the cavities, when the molded products are loaded in other locations while maintaining the arrangement of the cavities, It is possible to newly stack another molded product between the already stacked molded products while maintaining the arrangement of the cavities.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A powder molding die apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings. The powder molding die device of the present embodiment is one of the devices in a facility for manufacturing small magnets. FIG. 3 is a conceptual diagram showing the overall configuration of the powder molding die device 1 and its peripheral devices. A lower punch base 2 having a large number of lower punches 5 standing upright and a mold mounting base 9 into which a mold 4 is fitted,
It is fixed to the frame 3 of the powder molding die device 1.
Further, a large number of cavities 30 are provided through the die 4, and since the lower punch 5 is fitted into the cavities 30, the die 4 can be moved vertically by the lower cylinder 6. Is held. Furthermore, mold 4
In order to fit the upper punches 10 into the cavities 30, the upper punch table 8 on which a large number of the upper punches 10 stand is held by the upper cylinder 7 so as to be vertically movable.

In the powder molding die apparatus 1 having the above-mentioned structure, the concave portion formed by the cavity 30 and the upper surface of the lower punch 5 (hereinafter, the concave portion is also referred to as "cavity 30").
2) is filled with the powder material 25 (see FIG. 2) described later, the upper punch 10 moves downward and presses the powder material 25 filled in the cavity 30. After that, the upper punch 10 is moved upward and the die 4 is moved downward to obtain molded products 32 and 33 (see FIGS. 6 and 7) that are in close contact with the upper surface of the lower punch 5. For convenience of explanation, the molded products 32 and 33 are the lower punch 5.
The mechanism of close contact with the upper surface of is omitted.

The molded products 32 and 33 obtained from the powder molding die device 1 are taken out by the take-out device 11 arranged on the right side of the powder molding die device 1. The take-out device 11 is
Vacuum pad mount 1 to which a belt pad 12 and a vacuum pad 13 for sucking the molded products 32 and 33 are attached
4, a take-out cylinder 15 for moving the vacuum pad mount 14 to the upper part of the mold 4, a vacuum pump 16 for applying a vacuum to the vacuum pad 13, a molded product 32 taken out,
It is composed of a setter 17 for loading 33.
Since the molded products 32 and 33 are always present at a predetermined position of the lower punch 5, the set products 17 are set by the vacuum pad 13 and the like while the predetermined positions are held.
Can be loaded on. The molded products 32 and 33 loaded on the setter 17 are conveyed to a sintering furnace (not shown), sintered for a long time, and then magnetized into small magnets.

Next, the filling means for filling the cavity 30 with the powder material 25 will be described in detail with reference to the drawings. FIG. 2 shows a diagram showing the main part of the filling means. A guide groove 21 is formed by a guide plate 20 on the die mount 9 of the powder molding die apparatus 1. Further, a mold 4 provided with a large number of cavities 30 is fitted in a part of the guide groove 21 of the mold mounting base 9. further,
The powder container 22 that slides in the guide groove 21 has a drive arm 2
3 is additionally provided, and the driving force of a driving source (not shown) is transmitted to the powder container 22 via the drive arm 23, so that the powder container 22 slides in the guide groove 21 in the first direction H1. Can reciprocate.

The powder container 22 is a frame body that is open in the vertical direction, and is divided by a plate 24 into a first chamber 22a and a second chamber 22b. The powder material 25 is supplied to the first chamber 22a from above by a powder material supply device (not shown), and a rake 26 for preventing a crosslinking phenomenon of the supplied powder material 25 is provided. There is. Further, an air cylinder 27 for driving the rake 26 is arranged in the second chamber 22b, and is fixed to the plate 24.

To fill the powder material 25 into the cavity 30 provided in the mold 4 by the above-mentioned filling means,
The powder container 22 supplied with the powder material 25 in the first chamber 22a is moved toward the mold 4 along the guide groove 21. At this time, the powder material 25 in the first chamber 22a is
Since the powder material 25 is pushed out, the powder material 25 also moves in the direction of the mold 4 while being held in the first chamber 22a. After that, when the powder container 22 moves over the mold 4, the powder material 25 falls into the cavity 30 by its own weight. Therefore, the cavity 30 provided in the mold 4 should be filled with the powder material 25. You can Then, by moving the powder container 22 to the opposite side of the first direction H1 and reciprocating it, the cavity 30 can be more reliably filled with the powder material 25. That is, such a filling means is a so-called dropping method. When a material having poor fluidity (for example, ferrite particles) is used as the powder material 25, the bridging phenomenon of the powder material 25 frequently occurs. The rake 26 is being driven.

Next, the arrangement of the cavities 30 provided in the mold 4 according to the present invention will be described in detail with reference to the drawings. In FIG. 1, the cavity 30 provided in the mold 4 is shown.
The figure showing the arrangement of is shown. The cavity 30 is
It is formed of a rectangle having a long side w and a short side d (for example, long side 27 mm × short side 14 mm) according to the shape of the small magnet product. In addition, in the peripheral portion 31 of the cavity 30,
In order to further improve the durability, a super hard material different from the material of the mold 4 is used.

The arrangement of the cavities 30 shown in FIG. 1 will be described. In the second direction H2 orthogonal to the first direction H1, the cavities 30 are linearly arranged at intervals of the first pitch P1 and are arranged in a plurality of rows. L1, L2, L3, L4 are formed, and such columns L1, L2, L3, L4 are
They are arranged at intervals of the second pitch P2 in the direction H1. Then, among the rows L1, L2, L3, and L4, the relative positions of the cavities 30 in rows adjacent to each other have a predetermined distance that is half the first pitch P1 in the second direction H2. Is off. Specifically, referring to the relative positions of the cavities 30 in the adjacent rows L1 and L2, the rows L1 and L in the second direction H2 are described.
The relative positional deviation s of the two cavities 30 is half the first pitch P1. In addition, other combinations of adjacent columns (L2, L3), (L
The same applies to the relative displacement of the cavity 30 in (3, L4).

The number of cavities 30 in each row L1, L2, L3, L4 is determined from the shape and size of the die 4 in order to ensure the uniformity of the pressing force of the upper punch 10. There is. Further, the cavity 30 has an orientation, and the long side W of the cavity 30 is parallel to the first direction H1. Furthermore, adjacent cavities 3
The wall thickness t formed between the long sides W of 0 is larger than the short side d of the cavity 30.

Next, by the dropping-type filling means,
A state in which the powder material 25 is uniformly filled in each of the cavities 30 arranged as described above will be described in detail with reference to the drawings. 4 and 5 are diagrams showing a state in which the powder material 25 is filled in the cavity 30.

In the dropping-type filling means, when the powder container 22 starts moving toward the die 4 in the first direction H1,
The powder material 25 in the first chamber 22a is biased toward the plate 24 side, but when pushed out by the plate 24, the powder material 25 also moves toward the mold 4 in the first direction H1 (see FIG. 2). afterwards,
When the powder material 25 moves over the cavities 30 forming the row L1 of the mold 4, the powder material 25 falls into the cavities 30 by its own weight as shown in FIG.
The powder material 25 is filled in the cavity 30 provided in the.

At this time, a waveform 35 is generated between the cavities 30 forming the row L1 due to the difference in the reduction degree of the powder material 25, and the row L2 is formed in the moving direction in the first direction H1 during this period. Since the cavities 30 forming the ridges are located, the powder material 25 forming the corrugations 35 is filled in the cavities 30 forming the row L2, as shown in FIG. Therefore, when the powder material 25 moves over the cavities 30 forming the row L2, the waveform 35 generated in the powder material 25 disappears. That is, the relative positions of the cavities 30 in the adjacent rows are set to the first in the second direction H2.
By shifting the pitch P1 by half, the second direction H2
Waveform 3 cancels out the decrease of powder material 25 in
By repeating the generation and disappearance of 5, it is possible to uniformly fill the powder material 25 in all the cavities 30.

When the cavity 30 has a rectangular shape, the long side W of the cavity 30 is parallel to the first direction H1 and the longitudinal direction of the cavity 30 and the powder material 25 move. Since the first direction H1 is in the same direction, it is possible to easily drop the powder material 25 into the four corners of the cavity 30 which are difficult to be filled by the dropping-type filling means.

Next, the state in which the molded products 32 and 33 obtained from the powder molding die device 1 are loaded on the setter 17 will be described in detail with reference to the drawings. 6 and 7, the molded product 3
The figure showing the state in which 2, 33 are loaded on the setter 17 is shown. In the powder molding die device 1, as described above, a molded product can be obtained in a state of being in close contact with the upper surface of the lower punch 5 (that is, the cavity 30 in which the lower punch 5 is inserted). As shown in FIG. 6, while the arrangement of the cavity 30 is maintained by the take-out device 11, the molded product 3
2 is loaded on the setter 17.

Therefore, the size between the long sides of the molded product 32 loaded on the setter 17 is the same as the wall thickness t of the cavity 30, and the size of the short side of the molded product 32 is the cavity 30. Since it has the same size as the short side d of the set pad 17, as shown in FIG.
By shifting 4 in the second direction H2 which is orthogonal to the first direction H1 by half of the first pitch P1, another molded product 33 (shaded) is placed between the already stacked molded products 32. The tee 30 can be newly loaded while maintaining the arrangement. Therefore, the durability of the wall thickness t formed between the long sides W of the adjacent cavities 30 (that is, the wall thickness t
Of the molded articles 32 and 33 loaded on the setter 17 can be further narrowed while sufficiently securing the thickness) of the molded articles 32 and 33 loaded on the setter 17, thereby improving the loading efficiency of the molded articles 32 and 33 loaded on the setter 17. It is possible.

As described above, the molded products 32 and 33 loaded on the setter 17 are conveyed to a sintering furnace (not shown) and sintered for a long time in a later step. In the sintering in the process, the interval between the molded products 32 and 33 loaded on the setter 17 does not affect the sintering, and the sintering time is long, so that the loading efficiency is improved. As a result, the efficiency of the sintering process, which is a later process, is significantly improved.

As described in detail above, according to the powder molding mold apparatus 1 having the mold 4 in which the cavities 30 are arranged according to the present embodiment, each of the rows L1, L2, L.
3, the first direction H between the cavities 30 forming L4
Since the cavities 30 forming rows adjacent to each other are located at 1, the cavities 30 forming a row are filled when the powder material 25 is filled in the cavities 30 by the dropping-type filling means. Even if the corrugation 35 is generated when the powder material 25 is filled in, the powder material 25 is filled in the cavities 30 forming the adjacent row in the direction in which the powder container 22 moves in the first direction H1. It is possible to eliminate the corrugation 35, and the long side W of the cavity 30 and the first direction H in which the powder container 22 moves.
By making 1 parallel, the powder material 25 can be easily filled in the four corners of the cavity 30, so that the powder material 25 can be uniformly filled in each of the cavities 30. It is possible to provide the powder molding mold apparatus 1 having the mold 4 in which the cavities 30 are arranged so that the material 25 is uniformly filled.

In each row L1, L2, L3, L4, since the wall thickness t formed between the long sides W of the adjacent cavities 30 is larger than the short side d of the cavities 30, the cavities are already formed. Setter 17 with tee 30 in place
Another set of molded articles 33 is held between the molded articles 32 stacked in the same space while the arrangement of the cavities 30 is maintained.
7 can be newly loaded, and therefore powder material 25
It is possible to provide the powder molding mold apparatus 1 having the mold 4 in which the cavities 30 are arranged so that the powder is evenly filled and the loading efficiency of the setter 17 is improved.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention. For example, in the above-described embodiment, the relative positional deviation s of the cavities 30 in the adjacent rows is set to half the first pitch P1, but the first pitch P1 is set.
If there is such relative positional deviation s regardless of the half size of
Can be uniformly filled.

The number of rows formed by the cavities 30 in a straight line in the second direction H2 is an even number of four rows.
Even if the number of such rows is odd (for example, 5 rows), it is possible to uniformly fill the cavity 30 with the powder material 25. Further, although the shape of the cavity 30 is rectangular, the shape of the cavity 3 is not limited to the rectangular shape.
It is possible to uniformly fill 0 with the powder material 25.
When the shape of the cavity 30 has a longitudinal direction, the longitudinal direction and the first direction H1 may be parallel to each other.

[0036]

As is apparent from the above description, according to the powder molding apparatus of the present invention, in the first direction between the cavities forming each row, the cavities forming the rows adjacent to each other are formed. Since the tee is located, when the powder material is filled in the cavities by the drop-type filling means, even if the cavities forming a row are filled with the powder material, In the direction in which the powder container moves in one direction, it is possible to eliminate the corrugation when the powder material is filled in the cavities forming the rows located next to each other. By making the first direction in which the container moves parallel to each other, it is possible to easily fill the four corners of the cavity with the powder material, so that it is possible to uniformly fill the powder material in each cavity. Powder material It is possible to provide a powder molding die apparatus having a mold disposed is made of the cavity so as to be uniformly filled.

Further, in each row, the wall thickness formed between the long sides of the adjacent cavities is larger than the short side of the cavities, so the moldings already loaded in the setter in the state where the cavities are arranged. Between the products, another molded product can be newly loaded on the setter while maintaining the cavity arrangement, so that the powder material is uniformly filled and the loading efficiency of the setter is improved. Moreover, it is possible to provide a powder molding die device having a die in which the respective cavities are arranged.

[Brief description of drawings]

FIG. 1 is a diagram showing an arrangement of cavities provided in a mold.

FIG. 2 is a diagram showing a main part of a filling means by a dropping method.

FIG. 3 is a conceptual diagram showing an overall configuration of a powder molding die device and its peripheral devices.

FIG. 4 is a diagram showing a state in which a powder material is filled in a cavity.

FIG. 5 is a diagram showing a state in which a powder material is filled in a cavity.

FIG. 6 is a diagram showing a state in which molded products are stacked on a setter.

FIG. 7 is a diagram showing a state in which molded products are stacked on a setter.

FIG. 8 is a diagram showing a main part of a filling device according to a conventional dropping method.

FIG. 9 is a diagram showing a waveform generated in a conventional powder material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold apparatus for powder molding 4 Mold 22 Powder container 25 Powder material 30 Cavity H1 1st direction H2 2nd direction L1, L2, L3, L4 row P1 1st pitch P2 2nd pitch t Wall thickness W Long side of cavity d Short side of cavity

Claims (4)

[Claims] 1. The powder material in the powder container is moved to the cavity by sliding a powder container having an open bottom surface in a first direction on an upper surface of a mold provided with the cavity. In a powder molding die apparatus including a filling means for dropping and filling, the cavities are linearly arranged at a first pitch in a second direction orthogonal to the first direction to form a plurality of rows. ,
Arranging the rows at intervals of a second pitch in the first direction, and arranging the rows so that relative positions of the cavities of the adjacent rows are displaced in the second direction by a predetermined distance. According to the above, the cavity of the mold is arranged, and the mold apparatus for powder molding is characterized. 2. The powder molding die apparatus according to claim 1, wherein the predetermined distance is half the first pitch. 3. The powder molding die apparatus according to claim 2, wherein the cavity is formed in a rectangular shape, and a long side of the cavity is parallel to the first direction. Mold device for powder molding. 4. The powder molding die apparatus according to claim 3, wherein the wall thickness formed between the long sides of the adjacent cavities is larger than the short side of the cavities. Mold device for powder molding.