JP3240365B2 - Powder filling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a magnetic powder,
A hopper into which powder such as ferrite powder (hereinafter simply referred to as “powder”) is charged, the hopper is moved along the upper surface of the mold, and the powder is discharged from the lower opening of the hopper into the powder of the mold. The present invention relates to a powder filling apparatus equipped to press-mold molded products such as magnets and cores (hereinafter, simply referred to as “molded products”) with a molding die by dropping and supplying them into filling holes.

[0002]

2. Description of the Related Art Conventionally, as a powder filling apparatus as described above, a hopper into which powder is charged is moved in a straight line in the horizontal or vertical direction on the surface of a molding die. That naturally fall from the lower opening of the hopper into the powder filling hole of the mold (Japanese Utility Model Laid-Open No. 6-3).
No. 9406).

[0003] In the powder filling apparatus, as shown in FIG. 10, the filling density of the powder E in the powder filling hole C of the molding die W becomes higher on the side of the hopper with respect to the sliding movement direction A of the hopper. Variations in the powder packing density tend to occur. This tendency is remarkable for powders with a high angle of repose and poor fluidity,
Further, in a powder filling hole C ′ having a small filling interval as shown in FIG. 11, a bridge B is formed at the entrance of the powder filling hole C ′,
As shown in FIG. 12, a nest-shaped underfilled portion X having a low packing density is provided.
Are likely to occur midway in the depth direction of the powder filling hole C ′.

[0004] When the packing density of the powder varies as described above, the molded product is deformed or has large dimensional variations as the powder is pressed or fired with a punch of a molding die. In the case of manufacturing a magnet, there is a method in which an orientation magnetic field is applied immediately before press molding. When the magnet flows after application of the magnetic field, a characteristic defect such as extreme bending is caused.

In particular, due to the demand for molded products, powder having a high angle of repose is often filled into a narrow powder filling hole of a molding die. However, the variation in the powder packing density is a significant bottleneck in forming the particles.

[0006]

SUMMARY OF THE INVENTION According to the present invention, powder can be supplied from a lower port of a hopper to a powder filling hole of a molding die at a uniform density and with a small variation in filling height. It is an object of the present invention to provide a powder filling apparatus that can fill a powder to be introduced without loss, and that can improve the production efficiency of a molded product.

[0007]

[Means for Solving the Problems]

In the powder filling apparatus according to the first aspect of the present invention, a hopper having a cylindrical body, a guide hole having a diameter larger than the outer periphery of the body of the hopper, and a driving device that horizontally turns. A frame, and a fixed frame having a guide hole of the same diameter that is located at a different level from the drive frame and forms a pair with the guide hole of the drive frame, and the hopper has a body with a guide hole and a guide hole. It is located in the hole and assembled to the drive frame and the fixed frame. The drive frame and the fixed frame sandwich the hopper body from the outer periphery with each hole edge as the drive frame rotates, and guide the hopper to the fixed frame. It is configured as a rolling mechanism of a hopper that rotates and revolves by being guided by guide holes of a drive frame along the holes.

In the powder filling apparatus according to a second aspect of the present invention, the drive frame and the fixed frame have the same number of guide holes and guide holes, and the plurality of hoppers are each formed by a pair of guide holes and guide holes. It is configured as a hopper rolling mechanism that moves simultaneously.

In the powder filling apparatus according to a third aspect of the present invention, the rolling mechanism of the hopper includes an arm plate for holding the drive frame horizontally, and a rotary plate for pivotally supporting the arm plate at an eccentric position of the plate surface. And a motor for rotating the rotating plate.

In the powder filling apparatus according to a fourth aspect of the present invention, the rolling mechanism of the hopper aligns the lower opening of the hopper with the powder filling hole of the mold, and the hopper is connected to the powder filling hole of the mold. It is configured by being mounted on a first base plate that can move in the horizontal direction, which is more retractable.

In a powder filling apparatus according to a fifth aspect of the present invention, the hopper is configured to be slidably mounted on a smooth surface of a support plate stretched above a surface of the mold.

According to a sixth aspect of the present invention, there is provided a powder filling apparatus comprising a metal plate having a powder drop hole facing a powder filling hole of a molding die on a plate surface as a support plate of a hopper. Have been.

In the powder filling apparatus according to a seventh aspect of the present invention, a hole is provided as a powder dropping hole, the hole edge being located slightly inside the hole edge of the powder filling hole. I have.

In the powder filling apparatus according to claim 8 of the present invention, the support plate of the hopper aligns the powder drop hole with the powder filling hole of the molding die, and fills the whole plate with the powder of the molding die. It is configured by being mounted on a second base plate movable in the horizontal direction that is retracted from the section.

In a powder filling apparatus according to a ninth aspect of the present invention, the second base plate has a cutout space in which the first base plate is disposed inside the plate surface, and the first base plate has a cutout space. It is configured by equipping it so that it can move in the horizontal direction inside.

[0017]

In the powder filling apparatus according to the first aspect of the present invention, a hopper having a cylindrical body and a drive frame having a guide hole having a diameter larger than the outer periphery of the body of the hopper and swinging horizontally. And a fixed frame having a guide hole of the same diameter that is located at a different level from the drive frame and that is paired with a guide hole of the drive frame,
The body of the hopper is located in the guide holes of the drive frame and the guide holes of the fixed frame, and is sandwiched by the edges of the holes from the outer periphery, and the hopper is guided along the guide holes of the fixed frame. The powder can be rotated and revolved by being guided by the above, so that the powder can be uniformly dropped and supplied into the hole with a simple structure from around the hole of the powder filling hole with a simple structure and a uniform packing density. Also,
Since no other mechanism of the powder filling device including the hopper rolling mechanism is provided on the upper side of the hopper, a powder supply device such as a shooter and related devices such as an upper punch are provided. Effective space can be sufficiently secured.

In the powder filling apparatus according to a second aspect of the present invention, a plurality of hoppers are simultaneously rotated by a hopper rolling mechanism.
Due to the revolving motion, the efficiency of filling the powder and, in turn, the efficiency of manufacturing the molded product can be increased.

In the powder filling apparatus according to the third aspect of the present invention, the drive frame is turned horizontally by pivotally supporting the arm plate of the drive frame at the eccentric position of the rotary plate, so that the hopper has a simple structure. It is rotated and revolved.

In the powder filling apparatus according to claim 4 of the present invention, the hopper rolling mechanism including the hopper is movably supported by the first base plate, so that after the powder is filled,
The whole can be quickly retracted so as not to hinder the press forming of the powder with a punch that moves up and down the mold.

In the powder filling apparatus according to the fifth aspect of the present invention, the hopper can be smoothly rotated and revolved by placing the hopper slidably on the smooth surface of the support plate.
Powder can be prevented from adhering and remaining on the plate surface, and even metered powder can be dropped into the powder filling hole of the mold without loss.

In the powder filling apparatus according to a sixth aspect of the present invention, the hopper is provided with a thin metal plate having a powder drop hole opposed to the powder filling hole of the mold as a support plate of the hopper. The powder can be smoothly dropped and supplied to the powder filling hole of the molding die by sliding and moving with the drop hole.

In the powder filling device according to claim 7 of the present invention, since the edge of the powder drop hole is located slightly inward of the powder filling hole of the mold, the plate surface of the support plate is Even if there is a slight gap between the powder filling hole of the mold and the powder, the powder can be reliably dropped into the powder filling hole of the mold and supplied.

In the powder filling apparatus according to claim 8 of the present invention, since the support plate of the hopper is stretched on the second base plate movable in the horizontal direction, the powder is formed after the powder is filled. When press-molding with a punch capable of moving up and down the mold, the support plate can be retracted in the horizontal direction so as not to hinder the same as the rolling mechanism of the hopper.

In the powder filling apparatus according to the ninth aspect of the present invention, the support plate can be retreated in the horizontal direction by a simple mechanism together with the hopper rolling mechanism, and the lower opening of the hopper and the powder dropping of the support plate can be achieved. The positioning of the holes with the powder filling holes of the mold can also be performed individually and accurately.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 9, FIG. 1 is a sectional view showing a powder filling apparatus together with a molding die 1 for press-molding powder. The powder filling apparatus converts the powder E into a molding die 1 from a bottomless cylindrical hopper 2 into which the powder E is charged.
Of the powder filling hole 10. The molding die 1 has a die 11 provided with a powder filling hole 10 of a flat circular shape or a ring shape, and a lower punch 12 which moves up and down as described later is provided inside the powder filling hole 10. The lower punch 2 is provided for press-forming the powder E filled in the powder filling hole 10 with a vertically movable upper punch (not shown).

The powder filling device includes a cylindrical body 20.
Is provided. This hopper 2
Has an upper opening 21 which is expanded in a trumpet shape to receive the powder E supplied from a shooter or the like, and the lower inner diameter of the body 20 drops the powder E into the powder filling hole 10 of the molding die 1. Lower mouth 2
2 is formed. On the lower side of the hopper 2, a scraper 23 including a circular outer frame 23a and a radial inner bar 23b as shown in FIG. 2 is provided. The scraper 23 is provided so as to form a lower opening 22 of the hopper 2 by being fixed to a lower portion of the body portion 20 by a holder 24.

The hopper 2 is supported by a hopper rolling mechanism 3 that rotates and revolves along the upper surface of the mold 1. The rolling mechanism 3 of the hopper has a drive frame 30 having a guide hole 30 a having a diameter larger than the outer circumference of the body portion 20 and a guide hole 31 a having the same diameter as the guide hole 30 a of the drive frame 30. A frame 31 is provided. The drive frame 30 is formed of a flat plate having a perfect circular guide hole 30a formed in the plate surface, and is provided so as to be horizontally turned as described later. The fixed frame 31 is arranged stepwise above or below the drive frame 30 (lower in the figure).

The drive frame 30 has a plurality of guide holes 30a on a plate surface so as to be provided with a plurality of hoppers 2, and a guide hole 31a paired with each guide hole 30a has a first base plate described later. Are provided on the plate surface. A plurality of hoppers 2 are assembled to the drive frame 30 and the fixed frame 31 by locating the body portion 20 in each pair of the guide hole 30a and the guide hole 31a.

As shown in FIG. 3, the rolling mechanism of the hopper holds the driving plate 30 horizontally by a long arm plate 32, pivotally supports the arm plate 32 with a rotating plate 33, and connects the endless belt 34 to the rotating plate 33. The rotating plate 33 is connected to the motor 35
It is configured to be driven to rotate. The arm plate 32 is positioned at an eccentric position on the plate surface with respect to the rotating plate 33.
The drive plate 30 is mounted so as to pivot by pivoting on the drive plate 30.

A plurality of rotating plates 33 are provided at intervals, and the driving plate 30 is provided so as to be able to stably pivot by pivotally connecting the arm plate 32 to an eccentric position of each plate surface with a support shaft 36. Further, a tension roller 37 for pressing the belt surface is assembled to the endless belt 34 so as to reliably transmit the driving force of the motor 35 to each rotating plate 33.

As shown in FIG. 4, each rotating plate 33 is provided by bearing a rotating shaft 33b on a support 33c via a bearing 33a. Arm plate 32
The support shaft 36 is mounted on the plate surface of the rotary plate 33 and is supported by the arm plate 32 via a bearing 36a. The rolling mechanism 3 of the hopper including these components is mounted on the plate surface of the first base plate 4 because the support 33c of the rotating plate 33 is mounted and fixed on the plate surface. The first base plate 4 includes
The fixed frame 31 is attached by fitting and fixing a perfect circular ring member to the plate surface.

The first base plate 4 is accommodated and arranged inside the second base plate 5 by providing a cutout space 50 on the plate surface of the second base plate 5 as shown in FIG. The first base plate 4 is provided with a cut-out space 50 by bridging and mounting the drive cylinder 40 between the first base plate 4 and the second base plate 5.
It is provided so that it can move in the horizontal direction inside the. The drive cylinder 40 moves the first base plate 4 to align the lower opening 22 of the hopper 2 provided in each hole of the drive frame 30 and the fixed frame 31 with the powder filling hole 10 of the molding die 1. ,
Further, the hopper 2 is provided so as to retreat from the powder filling hole 10 of the molding die 1.

To guide the base plate 4, the first base plate 4 is provided with a guide bar 41 on the plate surface. Further, a guide block 51 that slidably fits and supports the guide bar 41 is fixedly mounted on the second base plate 5.

As shown in FIG. 4, the second base plate 5 is provided with a support plate 6 on which the hopper 2 is slidably mounted. The support plate 6 supports the hopper 2 with a smooth surface, and is formed of a mirror-finished thin metal plate such as stainless steel. This support plate 6 is connected to the second
Is stretched below the base plate 6.

On the surface of the support plate 6, a powder drop hole 61 as shown in FIG. 5 is provided. The powder drop-in hole 61 is formed as a double-divided opening 61c through several connecting portions 61b from the place where the central portion 61a is not opened in accordance with the flat ring-shaped powder filling hole 10. I have.
The inner and outer edges 61d and 61e of each opening 61c are formed by extracting the plate surface of the support plate 6 so as to be located slightly inside the hole edges 10a and 10b of the powder filling hole 10.

As shown in FIG. 3, the second guide plate 5 has both sides supported by guide rails 52 and 53, and includes a drive cylinder (not shown) and moves in the horizontal direction similarly to the first guide plate 4. Equipped to do so. This guide rail 5
Of the two, 53, one side 52 has a plurality of rollers (not shown) on which one side of the base plate 5 is placed, and the other side 53 has a guide block 54 provided on the plate surface of the base plate 5. The second base plate 5 is arranged so as to be slidably fitted and to guide the second base plate 5 in the horizontal direction.

In the powder filling apparatus thus configured, a powder supply device such as a shooter and related devices such as an upper punch are provided on the upper side of the hopper 2, and the powder is charged into the hopper 2 and formed. It can be equipped so that the powder filled in the powder filling hole 10 of the mold 1 is press-formed by the upper punch and the lower punch 12. The related equipment is that the upper part of the hopper 2 is disposed as an effective space because no other mechanism of the powder filling apparatus including the hopper rolling mechanism 3 is disposed on the upper side of the hopper 2. Can be.

In the powder filling apparatus, a description will be given from the point of time when the previously filled powder is press-molded by the punch 12 (only the lower side is shown) of the molding die 1 and the next powder filling operation is started. The first base plate 4 and the second base plate 5 are retracted horizontally away from the powder filling hole 10 of the molding die 1. Therefore, when the powder filled in the powder filling hole 10 is press-formed by the upper punch and the lower punch 12, the upper punch does not hinder the vertical movement. Also,
The first base plate 4 also has the hopper 2
The second base plate 5 is horizontally moved within the plate surface of the second base plate 5 so as to be retracted from the first base plate 5.

In order to start the next powder filling operation, the upper punch having finished pressing the powder is moved upward to move the second base plate 5 in the direction close to the molding die 1 and the support plate 6 Is aligned with the powder filling hole 10 of the molding die 1. Next, the first base plate 4 is connected to the second base plate 5
Similarly, move the lower port 22 of the hopper 2
Align with the hole 61 of Since the base plates 4 and 5 are individually moved, the powder filling holes 10 and
The hole 61 of the support plate 6 and the lower opening 22 of the hopper 2 can be accurately positioned vertically.

After the setting is completed, the motor 35 is driven,
The rotating plate 33 is rotated via the endless belt 34. When the rotary plate 33 rotates, the arm plate 32 of the drive frame 30 is eccentrically pivotally attached to the rotary plate 33. Therefore, the arm plate 32 makes a circular motion in the front-rear direction and left and right in the horizontal direction, thereby rotating the drive frame 30. Can be

When the drive frame 30 pivots, the guide hole 30a rotates while moving in the direction of arrow F with respect to the guide hole 31a of the fixed frame 31, as shown in FIGS.
Is sandwiched between the edges of the guide hole 30a and the guide hole 31a, and the hopper 2 is rotated along the edge of the guide hole 31a so as to shift the contact point P → P '. With this rotational movement, the hopper 2 moves the outer periphery of the body 20 to each of the holes 30.
The hopper 2 rotates and revolves in the direction of the arrow Y along the hole edge of the guide hole 31a because it slides on the hole edge of the holes 31a and 31a.

The hopper 2 rotates and revolves around the edge of the powder drop hole 61 of the support plate 6 facing the powder filling hole 10 of the molding die 1, and lowers the lower opening 22 with the powder of the support plate 6. The powder F which has been charged in advance is dropped into the powder filling unit 10 of the molding die 1 by sliding and moving with the drop hole 61. The hopper 2 slides smoothly on the smooth surface of the support plate 6, and rotates and revolves around the hole of the powder filling hole 10 of the molding die 1 via the support plate 6. Can be supplied to the inside of the powder filling hole 10 from the hole edge without any direction.

Accordingly, the powder E is uniformly supplied into the powder filling hole 10 of the molding die 1 without dropping such that the filling density becomes high at a specific portion of the powder filling hole 10. it can. Also, even if the powder filling hole 10 of the mold 1 is a flat ring shape and narrow, it is possible to prevent the occurrence of a bridge or the like.

The hopper 2 is preferably rotated and revolved so that the diameter of the lower opening 22 is shifted inward from the periphery of the powder filling hole 10 as shown in FIG. In the above-described embodiment, since the support plate 6 is provided, by shifting the inner side of the outer edge 61a of the powder drop hole 61,
The powder E can be dropped and supplied to the powder filling hole 10 of the molding die 1 without leaving the powder E. At the same time, since the hopper 2 slides on the smooth surface of the support plate 6, the powder E does not adhere to the plate surface of the support plate 6 and remains. It can be dropped into the body filling hole 10 and supplied.

Since the drive frame 30 and the fixed frame 31 are provided with the same number of guide holes 30a and guide holes 31a, and a plurality of hoppers 2 are assembled, the respective hoppers 2 can rotate and revolve at the same time, and the powder E Into the plurality of filling holes 10 of the mold 1. Therefore, with this powder filling apparatus, the efficiency of filling the powder can be increased, and thus the efficiency of manufacturing the molded product can be increased.

In the above embodiment, the hopper 2 is slidably mounted with the support plate 6 having a smooth surface, but the hopper 2 is mounted directly on the upper surface of the mold 1 so as to slide. May be placed. The outer diameter of the hopper 2 and the guide hole 3
The outer diameter of the hopper 2 and the guide hole 30a and the guide hole 31a are used to absorb the respective dimensional errors.
It is preferable to set the dimensions so that some gap is generated between them. Providing this gap is preferable because it can prevent the powder E from being clogged between the hopper 2 and the guide hole 30a and the guide hole 31a.

The powder E is slid by lowering the lower punch 12 gradually from the upper surface position of the molding die 1 or by moving the die 11 up as a whole in advance with the dropping supply of the powder. It can be cut and filled. In addition, lower punch 1
2 can be lowered in advance to about 90% of the total filling depth, and when the powder filling surface is in a cut-off state, the lower punch 12 can be gradually lowered to fill the remaining powder while sliding. .

[0049]

As described above, according to the powder filling apparatus of the present invention, the powder is uniformly supplied from the hopper to the powder filling hole of the molding die with a simple mechanism at a uniform filling density. can do.

Since no mechanism of the powder filling device itself is provided on the upper side of the hopper, an effective space for providing a powder supply device such as a shooter and related equipment such as an upper punch is provided. It can also be secured.

Since the hopper can be smoothly rotated and revolved by sliding on the smooth surface of the support plate, all of the hopper can be dropped and supplied to the powder filling hole of the molding die without remaining the powder.

In addition, since the rolling mechanism of the hopper and the support plate can be retracted from the powder filling hole of the molding die, they can be moved without disturbing the press molding by the powder molding die, and the powder can be quickly pressed. You can do it.

Further, since a plurality of hoppers are provided and one hopper rolling mechanism can rotate and revolve, respectively, the efficiency of filling the powder can be increased, and the efficiency of manufacturing a molded product can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a powder filling device according to the present invention.

FIG. 2 is a plan view showing a scraper of a hopper provided in the apparatus.

FIG. 3 is a plan view showing the entire apparatus of FIG. 1;

FIG. 4 is a side sectional view showing the entire apparatus of FIG. 1;

FIG. 5 is an explanatory view showing dimension settings of a powder drop hole of a support plate and a powder filling hole of a molding die provided in the apparatus of FIG. 1;

FIG. 6 is an explanatory diagram showing rotation and revolving motion of a hopper provided in the apparatus of FIG. 1;

FIG. 7 is an explanatory diagram showing rotation and revolution of the hopper after a lapse of time from that of FIG.

FIG. 8 is an explanatory diagram showing the rotation and revolving motion of the hopper in terms of a positional relationship with a powder filling hole of a molding die.

FIG. 9 is an explanatory view provided with a plurality of the hoppers.

FIG. 10 is an explanatory diagram showing a problem caused by a conventional powder filling method in a plane of a powder filling hole.

FIG. 11 is an explanatory view showing another problem caused by the conventional powder filling method in the plane of a powder filling hole.

FIG. 12 is an explanatory diagram showing the problem of FIG. 11 in a cross section of a powder filling hole.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 molding die 10 powder filling hole of molding die 2 hopper 20 body of hopper 3 rolling mechanism of hopper 30 drive frame 30a guide hole of drive frame 31 fixed frame 31a guide hole of fixed frame 32 arm plate 33 rotating plate 35 motor 36 Support shaft of arm plate 4 First base plate 5 Second base plate 50 Cutout space 6 Support plate 61 Powder drop hole of support plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-162940 (JP, A) JP-A-6-39406 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01J 4/00-4/04

Claims (9)

(57) [Claims] 1. A bottomless cylindrical hopper into which powder is charged, the hopper is moved horizontally along the upper surface of a mold, and powder is transferred from a lower opening of the hopper to a powder filling hole of the mold. In a powder filling device for dropping and supplying, a hopper having a cylindrical body, a drive frame having a guide hole having a diameter larger than the outer periphery of the hopper and rotating horizontally, and a drive frame and a step And a fixed frame having a guide hole of the same diameter that is paired with the guide hole of the drive frame, wherein the hopper positions the body portion in each of the guide hole and the guide hole, and In addition, the drive frame and the fixed frame are sandwiched between the outer periphery of the hopper body at each hole edge as the drive frame rotates, and the hopper is guided along the guide holes of the fixed frame. Rolling mechanism of hopper that rotates and revolves when guided by holes Powder filling apparatus characterized in that it comprises in. 2. The drive frame and the fixed frame have an equal number of plural guide holes and guide holes, and are provided as a hopper rolling mechanism for simultaneously moving a plurality of hoppers by the pair of guide holes and guide holes. The powder filling device according to claim 1, wherein: 3. A rolling mechanism for the hopper, comprising: an arm plate for holding a drive frame horizontally, a rotating plate for pivotally supporting the arm plate at an eccentric position on a plate surface, and a motor for rotating the rotating plate. 2. The method according to claim 1, further comprising:
Or the powder filling device according to 2. 4. The rolling mechanism of the hopper is capable of moving a lower opening of the hopper into a powder filling hole of a molding die and moving the hopper in a horizontal direction to retreat from the powder filling hole of the molding die. The powder filling device according to any one of claims 1 to 3, wherein the device is mounted on a first base plate. 5. The hopper according to claim 1, wherein the hopper is slidably mounted on a smooth surface of a support plate stretched above a surface of a molding die. Powder filling equipment. 6. The powder filling apparatus according to claim 5, wherein the support plate is a thin metal plate having a powder drop hole facing a powder filling hole of a molding die on a plate surface. 7. The powder filling apparatus according to claim 6, wherein the powder drop hole is a punched hole whose hole edge is located slightly inside the hole edge of the powder filling hole. 8. The second supporting plate is capable of moving in a horizontal direction so that the powder drop hole is aligned with the powder filling hole of the molding die and the whole plate is retracted from the powder filling portion of the molding die. The powder filling device according to any one of claims 5 to 7, wherein the powder filling device is provided on a base plate. 9. The second base plate has a cutout space for disposing the first base plate inside the plate surface, and the first base plate is mounted so as to be movable in the horizontal direction in the cutout space. The powder filling device according to claim 8, wherein