JP3157646B2 - Apparatus and method for manufacturing multilayer brush - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for manufacturing a multi-layer brush in which raw material powders of two or more different materials are laminated.

[0002]

2. Description of the Related Art Generally, in a DC motor, a DC generator, or the like, an arbitrary commutator is short-circuited with a brush to perform commutation. However, the current change at the time of rectification is greatly delayed due to the inductance of the armature coil and the like, and the current change becomes large at the end of the rectification. Therefore, a large reactance voltage is generated by the inductance of the short-circuit coil. This causes a spark discharge between the brush and the commutator, roughening the commutator surface and forming an uneven surface. For this reason, there arises a problem that the amount of wear of the brush device is increased, the life thereof is significantly reduced, and the vibration noise of the brush itself is also increased.

In particular, when a high-performance magnet is used to reduce the size of a motor or the like and the thickness of the magnet is reduced, the distance between the armature and the stator yoke is reduced. For this reason, the magnetic resistance of the armature is reduced, and the inductance of the short-circuit coil is increased, so that the above-mentioned problem appears more remarkably.

For this reason, various methods for performing non-spark rectification have been conventionally performed. As a typical example, a proposal disclosed in Japanese Patent Application Laid-Open No. 4-46546 is known. In this proposal, the brush front end is made of low resistance material,
The rear end is formed by using a high-resistance material to reduce spark generation.

[0005] Further, as a method of manufacturing this kind of two-layer brush, Japanese Patent Application Laid-Open No. 2-86081 and Japanese Patent Application Laid-Open No. 2-860 are disclosed.
A proposal disclosed in, for example, Japanese Patent Publication No. 83 is known. In these proposals, two layers filled and stacked in a forming die are used.
A two-layer brush is manufactured by pressing various kinds of raw material powders or brushes with upper and lower punches.

[0006]

However, in the above-described conventional two-layer brush, the commutation characteristics do not approach an ideal commutation curve depending on the rotational position of the rotor, and particularly the boundary between the low-resistance material and the high-resistance material. However, there is a drawback in that it is difficult to completely suppress the generation of sparks because the current changes rapidly. For this reason, the present applicant has proposed a multilayer brush free of such disadvantages (Japanese Patent Application No. Hei 4-23).
No. 5231 "Brush device").

FIG. 7 is a perspective view showing the structure of a two-layer brush proposed by the present applicant. This two-layer brush 100
First layer 102 bounded by one diagonal of square cross section
And the second layer 104. First layer 102
Is a low resistance portion formed such that the commutator contact surface gradually narrows from the upstream side to the downstream side in the rotor rotation direction. The second layer 104 is a high-resistance portion formed such that the commutator contact surface gradually widens from the upstream side to the downstream side in the rotor rotation direction. FIG. 8A is a diagram showing an assembled state of the two-layer brush shown in FIG. Armature 11
The state where the two-layer brush 100 is assembled perpendicularly to the rotation direction of 0 is shown. FIG. 8B is a diagram showing a cross section taken along the line AA in FIG. 8A, in which the first layer 102 gradually narrows from the upstream side to the downstream side in the rotation direction.
The second layer 104 is shown to become progressively wider.

By using such a two-layer brush 100, the brush resistance changes smoothly with the progress of commutation, and no abrupt current change occurs during the entire commutation period, so that no spark is generated. Good rectification can be performed.

When the two-layer brush 100 is to be manufactured by the manufacturing method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2-86083, a two-layer brush having a boundary surface parallel to the upper and lower surfaces is pressed by upper and lower punches. This requires post-processing such as cutting after once manufacturing, which is troublesome and prolongs the manufacturing time. In addition, there is a problem that material is wasted and the cost is increased.

FIG. 9 shows a second embodiment having a boundary surface parallel to the upper and lower surfaces.
2 having a boundary surface inclined from the layer brush to the upper and lower surfaces
It is a figure showing the state where layer brush 100 is cut out. By removing the corners of the brush, the two-layer brush 100 is cut out, and the removed corners are completely wasted, which directly leads to higher costs. In addition, the work and time required for the deletion are extra.

Further, by expanding the two-layer brush 100 for one-way rotation, a three-layer brush for two-way rotation can be obtained.

FIG. 10 is a perspective view showing the structure of a three-layer brush proposed by the present applicant. This three-layer brush 120
The first layer 122 having a triangular prism shape provided on the upstream side in the normal rotation direction so that the commutator contact surface gradually narrows from the upstream side to the downstream side in the commutator normal rotation direction; A triangular prism-shaped second provided on the downstream side in the forward rotation direction so as to gradually narrow from the downstream side in the forward rotation direction to the upstream side in the commutator forward direction
Layer 124 and the first and second layers 122 and 124
A third layer 1 having a triangular prism shape formed to be located between
26. First and second layers 122, 12
Reference numeral 4 denotes a low resistance part, and the third layer 126 is a high resistance part.

By using such a three-layer brush 120, when the rotor rotates forward, the first layer 122 is mainly used.
Current flows through the commutator so as to cancel the short-circuit current of the armature coil, and when the rotor reverses, the current flows through the commutator mainly to cancel the short-circuit current of the armature coil through the second layer 124. Because of the flow, the commutation is completed at a relatively early stage in either forward rotation or reverse rotation.
In addition, since the brush resistance changes smoothly with the progress of rectification, abrupt current change does not occur during the entire period of rectification, and good rectification without sparks can be performed.

The three-layer brush 120 described above is
Interface between first layer 122 and third layer 126 and second layer 1
Since the boundary surface between the second layer 24 and the third layer 126 is not parallel, there is a problem that it cannot be manufactured by the manufacturing method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2-86083.

Therefore, an object of the present invention is to provide a multilayer brush which can manufacture an inexpensive brush by eliminating post-processing such as cutting, and without drastically changing the conventional process, without wasting material. An object of the present invention is to provide a brush manufacturing apparatus and a brush manufacturing method.

[0016]

In order to solve the above-mentioned problems, an apparatus for manufacturing a multi-layer brush according to the present invention has a plurality of punches for pressing raw material powder and a molding space. A molding die that forms a molding die, and one or a plurality of raw material powder partitioning plates that are provided to be inclined with respect to one surface of the molding space when the raw material powder is charged and are withdrawn when pressed by the punch. A feeder for sequentially charging two or more types of raw material powders into each space partitioned by the raw material partition plates, and filling the two or more raw material powders into the molding space partitioned by the partition plates. And then pressurizing to form a multi-layer brush.

Further, the method for producing a multilayer brush of the present invention comprises:
In a method for manufacturing a multilayer brush having an inclined interlayer boundary surface, a molding space formed in a molding die is partitioned by one or a plurality of raw material powder partition plates inclined with respect to one surface of the molding space. Later, different raw material powders are put into each space partitioned by the raw material powder partition plate, and after extracting the raw material powder partition plate, the punch is pressed by a punch or another punch different from the punch, and two or more kinds of the It is characterized in that raw material powders are pressure-formed and integrated.

[0018]

The apparatus for manufacturing a multilayer brush according to the present invention has a raw material powder partition plate for partitioning a molding space when two or more types of raw material powders are charged. Each of the two or more raw material powders can be separately charged and filled in each space. After filling two or more kinds of raw material powders, withdraw this raw material powder partition plate,
After that, by one of the punches,
By pressing the stacked raw material powders and engaging them with pressure, a multilayer brush having an inclined layer boundary surface is integrally formed.

According to the apparatus and method for manufacturing a multilayer brush of the present invention, two or more kinds of raw material powders are charged into a molding space having a raw material partition plate and filled, and then the laminated raw material powders are mixed. Since a multi-layer brush can be manufactured by pressing with a punch, post-processing such as cutting is not required, making it possible to manufacture an inexpensive multi-layer brush without wasting material without drastically changing the conventional process. Becomes

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First Embodiment FIG. 1 is a perspective view showing a partial structure of a manufacturing apparatus according to a first embodiment for manufacturing the two-layer brush 100 shown in FIG.

This manufacturing apparatus includes a molding die 10, horizontal punches 12 and 14, and a lower punch 16 which constitute a compression mold.
And an upper slide plate 18, a raw powder partitioning plate 20 provided in a compression mold for separating and filling the two raw powders, and a feeder for charging the two raw powders for brush molding. 30 and 32 are included.

The molding die 10 includes a molding space 40 for pressing the raw material powder of the brush, and a molding space 40.
And two raw powder input spaces 42 and 44, into which two types of raw powder of the brush are input and which functions as a measuring container for the raw powder.

The raw material powder partition plate 20 is used to separate and fill the two types of raw material powder when the two types of raw material powder are charged into the forming space 40. It is arranged to be inclined. The inclination direction of the raw powder partition plate 20 is a direction inclined with respect to each pressing surface of the horizontal punches 12 and 14, and forms a direction along one diagonal line of the bottom surface (square shape) of the molding space 40. . More specifically, the inclination angle of the raw material powder partition plate 20 (horizontal punch 1
2 and 14) is equal to the angle between the interlayer boundary surface and the lower surface of the two-layer brush 100 shown in FIG. The raw material powder partition plate 20 is used only when two types of raw material powders are charged, and is extracted when the brush is pressed.

The horizontal punch 12 is disposed so as to be movable in the horizontal direction adjacent to one of the raw material powder input spaces 42, and the raw material powder supplied to the raw material powder input space 42 is partitioned by the raw material powder partitioning plate 20. This is for extruding into the formed molding space 40 (the side of the horizontal punch 12 as viewed from the raw material powder partition plate 20 is referred to as a molding space 40a) and for pressing in the horizontal direction. Similarly, the horizontal punch 14 is disposed adjacent to the other raw material powder insertion space 44 so as to be movable in the horizontal direction, and the raw material powder supplied to the raw material powder insertion space 44 is partitioned by the raw material powder partition plate 20. Formed molding space 40 (horizontal punch 14 as viewed from raw powder partitioning plate 20)
The side is extruded into a molding space 40b) and pressed in the horizontal direction.

The lower punch 16 is disposed below the molding space 40 so as to be movable in the vertical direction, and rises when the brush after pressure molding is taken out.
In addition, the raw material powder in the molding space 40 can be molded under pressure by the lower punch 16.

One feeder 30 has a two-layer brush 100.
Is used to feed one of the raw material powders into the raw material powder input space 42.
Move to the top of 2. The feeder 30 includes a raw material powder reservoir and a raw material discharge device (both not shown) for feeding the raw material powder into a filling space in the feeder 30. The raw material powder discharging device has a mechanism for feeding raw material powder from a raw material powder reservoir to a filling space using compressed air, for example. Further, the raw material powder is discharged from the filling space into a raw material powder input space 42 through a raw material powder discharging port. It is designed to feed powder.

The other feeder 32 has the same structure as that of the feeder 30 and is used for charging the other raw material powder of the two-layer brush into the raw material powder input space 44. It moves to the upper part of the input space 44.

The upper slide plate 18 is provided with the molding space 4.
0 is sealed together with the horizontal punches 12 and 14 and the lower punch 16, and can be moved to the upper part of the molding space 40 when the brush is pressure-molded.

The upper slide plate 18 is provided integrally with the feeders 30 and 32 described above.

FIG. 2 shows that when two types of raw material powders are filled in the molding spaces 40a and 40b separated by the raw material partitioning plate 20, the raw material powders to be filled in the molding spaces 40a and 40b are filled. It is a figure which shows the structure for preventing overflow.

FIG. 2A shows a case where a lid 22 which is integrated with the raw material powder partition plate 20 and has a size which covers the upper surface of the molding space 40 is provided above the raw material powder partition plate 20. It is shown. Raw material powder partition plate 2 during brush pressure molding
When extracting 0, the raw powder partitioning plate 20 is extracted together with the lid 22.

FIG. 3B shows the upper slide plate 10.
Is provided with a partition plate through-hole 24 at a part thereof.
4 shows a case where the raw material powder partition plate 20 is inserted.

FIG. 3 and FIG. 4 are explanatory views of the manufacturing process in the present embodiment, and show in detail each process of forming the two-layer brush 100. FIG. FIGS. 3 (a1) and 3 (b1) and FIGS. 4 (c1) and 4 (d1) are plan views of the manufacturing apparatus of FIG. FIGS. 3 (a2) and 3 (b2) and FIGS. 4 (c2) and 4 (d2) are longitudinal sectional views of the manufacturing apparatus shown in FIG. 1 in respective steps. Corresponding.

Hereinafter, the two-layer brush 100 (having the structure shown in FIG. 7 and the first layer 102 comprising a low-resistance portion on the upstream side in the rotor rotation direction) is formed by using the above-described manufacturing apparatus of this embodiment.
(Having the second layer 104 formed of a high-resistance portion on the downstream side) will be described with reference to FIGS. 3 and 4. FIG. In the manufacturing apparatus described below, the lid 22 shown in FIG. 2A is integrally provided on the raw material powder partition plate 20. First layer 10
Reference numeral 2 denotes a low resistance portion formed such that the commutator contact surface gradually narrows from the upstream side to the downstream side in the rotor rotation direction. The second layer 104 is a high-resistance portion formed such that the commutator contact surface gradually widens from the upstream side to the downstream side in the rotor rotation direction. FIG. 8A shows the assembled state of the two-layer brush shown in FIG. 7. Step 1: First, two types of raw material powders are charged into the raw material powder input spaces 42 and 44. At the time of feeding raw material powder,
The lower punch 16 rises to a position where the upper surface thereof coincides with the upper surface of the molding space 40. The raw powder input spaces 42 and 44 are formed by the side surfaces of the lower punch 16 and the pressing surfaces of the horizontal punches 12 and 14. Is formed. A raw powder partition plate 20 inclined in a predetermined direction is arranged on the upper surface of the lower punch 16 with its lower end in contact with the lower end.

In this state, the upper slide plate 1
The feeder 30, 32 having an integral structure with the feeder 8 is moved until the discharge opening of the raw powder coincides with the upper surface of the raw powder input space 42, 44. Different kinds of raw material powders are introduced (see FIGS. 3A1 and 3A2).

Each of the raw material powder input spaces 42 and 44 has a predetermined capacity.
By charging two kinds of raw material powders so that 2, 44 are filled with each raw material powder, the raw material powder is also measured. By vibrating the feeders 30 and 32, the raw material powder can be more smoothly charged.

Step 2: Next, step 2 for the molding space 40
Filling of various kinds of raw material powders. The lower punch 16 is lowered while maintaining the contact state with the raw material powder partitioning plate 20, and the horizontal punches 12 and 14 are moved to the raw material powder input spaces 42 and 44, respectively, thereby forming the molding spaces 40a and 40b. Each is filled with two types of raw material powders (see FIGS. 3 (b1) and (b2)). Horizontal punch 12,
14 moves until it almost coincides with the side surfaces of the molding spaces 40a and 40b.
The filling of the two types of raw material powders into 0a and 40b is completed.

At this time, the lead wire 26 serving as the pigtail of the brush is inserted into the raw material powder in the molding space 40a through the through hole of the one horizontal punch 12.

Step 3: Next, the raw material powder partition plate 20 having an integral structure with the lid 22 is removed, and the upper slide plate 18 is moved to the upper part of the molding space 40, thereby sealing the molding space 40. (FIG. 3 (c1), (c
2)). At this time, in the two kinds of raw material powders in the molding space 40 from which the raw material powder partition plate 20 has been extracted, the position where the raw material powder partition plate 20 is located is almost the position of the interlayer boundary surface.

Step 4: Next, one of the horizontal punches 12 and 14 is moved in the horizontal direction.
By moving both of the raw materials 2 and 14 in the horizontal direction, the two types of raw material powders in the molding space 40 are pressed and engaged by the horizontal punches 12 and 14. Or horizontal punch 1
With both positions 2 and 14 fixed, the lower punch 16
The lower punch 16 and the upper slide plate 18 may be used to press-fit two kinds of raw material powders in the molding space 40.

Step 5: Thereafter, the lower punch 16 is further raised to take out the brush engaged under pressure (see FIGS. 3 (d1) and 3 (d2)), and the taken out brush is fired in a predetermined firing step. By doing so, the two-layer brush 100 is completed.

By devising the cross-sectional shape of the two-layer brush 100, the pressing force can evenly reach the end of the brush. If the vertical dimension of the cross section of the two-layer brush 100 is a and the horizontal dimension is b, a / b <1 or a
By making the size in the pressing direction relatively short so that / b is substantially equal to 1, the pressing force uniformly reaches the end of the brush.

As described above, in this embodiment, the raw material powder partition plate 20 is provided at an inclination in the molding space 40, and the molding space 40 is filled with two types of raw material powders. After the raw material powder partition plate 20 is extracted, these two types of raw material powders are engaged under pressure.

Therefore, the two-layer brush 100 can be formed only by one pressing step, and the conventional step does not need to be changed significantly. Further, since the two-layer brush 100 formed in this manner already has an inclined boundary surface in the forming process, post-processing such as cutting is not required, and waste of material can be eliminated. Further, since there is no need to perform post-processing such as cutting or separately press-mold the first layer 102 and the second layer 104, it is possible to manufacture an inexpensive brush with reduced cost.

Second Embodiment FIG. 5 is a perspective view showing a partial structure of a manufacturing apparatus of a second embodiment for manufacturing the two-layer brush 100.

The manufacturing apparatus of this embodiment includes a molding die 50, horizontal punches 52, 54, an upper punch 56, and a lower punch 58, which constitute a compression mold, and are provided in the compression mold.
A raw material powder partitioning plate 60 for separating and filling the various raw material powders; a partitioning plate vertical slide device 62 for inserting the raw material powder partitioning plate at the time of inserting the raw material powder and extracting at the time of pressing the raw material powder; And feeders 70 and 72 for charging two types of raw material powders for brush molding.

The molding die 50 has a molding space 80 for pressurizing the raw material powder of the brush, and a horizontal punch is formed so that each pressing surface is located on both sides of the molding space 80 in the horizontal direction. 52 and 54 are arranged. Also, the lower punch 58 is formed so that the lower surface of the molding space 80 becomes a pressing surface.
Is arranged.

The raw material powder partitioning plate 60 is used to separate and fill the two types of raw material powder when the two types of raw material powder are charged into the molding space 80.
This corresponds to the raw material powder partition plate 20 of the embodiment. However, the raw material powder partition plate 60 has a sufficient length in the vertical direction so that it can be inserted and removed through a groove formed between the feeders 70 and 72, and its upper end is partially bent. I have.

The partitioning plate vertical slide device 62 is for inserting and removing the raw powder partitioning plate 60, and inserts and removes the raw powder partitioning plate 60 by sandwiching a partially bent portion near the upper end of the raw powder partitioning plate 60. can do.

The feeders 70 and 72 include a two-layer brush 100
The two types of raw material powders are charged into the molding space 80 partitioned by the raw material partitioning plate 60 to be filled, and move to the upper part of the molding space 80 when the raw material powder is charged. The feeders 70 and 72 are integrated with each other and move at the same time, and a groove is formed between the feeders 70 and 72 for inserting and removing the raw powder partitioning plate 60 in the vertical direction as described above.

Next, the steps of manufacturing the two-layer brush 100 using the manufacturing apparatus of this embodiment will be described.

Step 1: First, two types of raw material powders are charged and filled in the forming space 80. Specifically, feeder 7
While moving 0,72 to the upper part of the molding space 80,
The raw material powder partition plate 60 is lowered from above the feeders 70 and 72 by the partition plate vertical slide device 62.
Thereafter, each of the two types of raw material powders is charged from the feeders 70 and 72 into the molding space 80 partitioned by the raw material partition plate 60. At this time, feeder 7
By vibrating 0 and 72, the raw material powder can be more smoothly charged.

Step 2: Next, the partition plate vertical slide device 6
After extracting the raw material powder partition plate 60 by raising the position 2, the feeders 70 and 72 are retracted to remove excess raw material powder in the upper part of the molding space 80. Thereafter, the upper punch 56 is lowered to the upper surface of the molding space 80, thereby sealing the molding space 80.

At this time, a lead wire 74 serving as a pigtail of the brush is inserted into the raw material powder in the molding space 80 through the through hole of the upper punch 56.

Step 3: Next, either one of the horizontal punches 52 and 54 is moved in the horizontal direction, or both the horizontal punches 52 and 54 are moved in the horizontal direction.
The two types of raw material powders in the molding space 80 are pressed and engaged by the horizontal punches 52 and 54. Alternatively, with the positions of both horizontal punches 52 and 54 fixed, the upper punch 5
6, by moving one of the lower punches 58 in the vertical direction, or by moving both the upper punch 56 and the lower punch 54 in the vertical direction. Different kinds of raw material powders may be pressed and engaged.

Step 4: Thereafter, the lower punch 58 is raised while the horizontal punches 52 and 54 are retracted, whereby
The brush that has been pressed and engaged is taken out, and the taken-out brush is fired in a predetermined firing step, whereby the two-layer brush 100 is completed.

As described above, also in the present embodiment, as in the first embodiment, the two-layer brush 100 can be formed only by one pressing step, and the conventional step does not need to be largely changed. . In addition, post-processing such as cutting is unnecessary, and waste of material can be eliminated.
Since there is no need to separately press-mold the layer 102 and the second layer 104, it is possible to manufacture an inexpensive brush with reduced costs.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

For example, a projection is provided partially near the lower end of the raw powder partitioning plates 20 and 60, and when the raw powder partitioning plates 20 and 60 are extracted, the interlayer boundary between the two types of raw powder is partially removed. By agitation, a boundary surface between the two types of raw material powders becomes a region where they enter each other. This allows
There is also an effect that the bonding strength of each raw material powder after the pressure engagement is increased, and the rectifying characteristic inherent in the two-layer brush 100 is slightly smoothed.

FIG. 6 is a diagram showing an example of the case where the above-mentioned projections are provided on the raw material powder partition plate. FIG. 7A shows a case where a plurality of small cylindrical protrusions are formed, and FIG.
FIG. 2 is a view of the raw material powder partition plate shown in FIG. Similarly, FIG. 3C shows a case where the protruding portion is formed by alternately bending the tip portion of the saw shape backward and backward, and FIG. 3D shows the raw material powder partition plate shown in FIG. It is the figure seen from A direction. By using such a raw material powder partition plate, a two-layer brush 100 having a partially agitated and disturbed interlayer boundary as shown in FIG. FIG. 1F is a diagram showing a cross section of a two-layer brush in the case of using a raw powder partition plate having no projections, and a substantially linear interlayer boundary surface is formed because partial stirring is not performed.

In the first and second embodiments described above, the case where the two-layer brush 100 is manufactured has been described as an example. However, the multi-layer brush having three or more layers can be provided by providing a plurality of the raw material powder partitioning plates 20 and 60. (For example, the three-layer brush 120 in FIG. 10) can also be manufactured. In this case, a raw material powder partition having the same inclination angle as each of the three or more interlayer boundaries is prepared, and a feeder for charging the raw material powder into each space partitioned by the raw material powder is prepared. do it.

Further, in the first and second embodiments described above, the case where the raw material powder partition plates 20 and 60 are flat plates has been described, but these partition plates 20 and 60 may be curved surfaces or the like. Any shape may be used as needed.

In the case of pressing the two kinds of raw material powders filled in the first embodiment by the horizontal punches 12 and 14, the lower punch 16 is not always necessary. Can be achieved. Similarly, when the two kinds of raw material powders filled in the second embodiment are pressed by the lower punch 58, the horizontal punches 52, 5
4 is not always necessary and can be replaced with a molding die 50 to simplify the apparatus.

[0065]

As described above, according to the apparatus and method for manufacturing a multi-layer brush of the present invention, two or more types of raw material powders are charged into a molding space having raw material partition plates and filled. Since it is possible to manufacture a multi-layer brush by pressing the laminated raw material powder with a punch, post-processing such as cutting is unnecessary, and waste of material is eliminated without drastically changing a conventional process. Inexpensive multilayer brushes can be manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a partial structure of a manufacturing apparatus of a first embodiment for manufacturing a two-layer brush.

FIG. 2 is a diagram showing a structure for preventing a raw material powder in a molding space from overflowing.

FIG. 3 is an explanatory diagram of a manufacturing process in the first embodiment.

FIG. 4 is an explanatory diagram of a manufacturing process in the first embodiment.

FIG. 5 is a perspective view showing a partial structure of a manufacturing apparatus of a second embodiment for manufacturing a two-layer brush.

FIG. 6 is a view showing a structure of a raw material powder partition plate partially provided with protrusions.

FIG. 7 is a diagram showing a structure of a two-layer brush proposed by the present applicant.

8 is a diagram showing an assembled state of the two-layer brush shown in FIG. 7;

FIG. 9 is a diagram illustrating a case where a two-layer brush having a boundary surface inclined with respect to the upper and lower surfaces is cut out from a two-layer brush having a boundary surface parallel to the upper and lower surfaces.

FIG. 10 is a view showing a structure of a three-layer brush proposed by the present applicant.

[Description of Signs] 10,50 Die for molding 12,14,52,54 Horizontal punch 16,58 Lower punch 18 Upper slide plate 20,60 Raw material powder partition plate 30,32,70,72 Feeder 40,80 Molding space 56 Upper punch 62 Partition plate vertical slide device

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-70511 (JP, A) JP-A-6-225501 (JP, A) JP-A-62-123939 (JP, A) 44431 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01R 43/12 H01R 39/26 H02K 13/00

Claims (4)

(57) [Claims] 1. A plurality of punches for pressing a raw material powder, a forming die having a forming space and forming a forming die together with the plurality of punches, and one of the forming spaces when the raw material powder is charged. One or a plurality of raw material powder separating plates to be provided at the time of being pressed by the punch, and two or more types of raw material powders are sequentially put into each space partitioned by the raw material powder separating plates. And a feeder, wherein the multi-layer brush is formed by filling the two or more types of raw material powders into the molding space partitioned by the partition plate and then pressing the raw material powder. 2. The raw material powder partition plate according to claim 1, wherein the raw material powder partition plate has a plurality of projections in a part thereof, and after filling the two or more types of raw material powder into the molding space, An apparatus for manufacturing a multilayer brush, wherein a boundary surface between the two or more kinds of raw material powders is partially stirred by drawing. 3. A method of manufacturing a multi-layer brush having an inclined interlayer interface, wherein one or a plurality of raw material powders in which a molding space formed in a molding die is inclined with respect to one surface of the molding space. After partitioning by a partition plate, a different raw material powder is put into each space partitioned by the raw material powder partition plate, and after extracting the raw material powder partition plate, the punch or the punch is pressed by another punch, A method for producing a multi-layer brush, wherein two or more kinds of the raw material powders are pressure-molded and integrated. 4. The raw material powder partition plate according to claim 3, wherein the raw material powder partition plate has a plurality of projections in a part thereof.
The method of manufacturing a multi-layer brush, wherein after filling at least one kind of raw material powder into the molding space, the interface between the two or more kinds of raw material powder is partially stirred by pulling out the raw material powder partition plate. Method.