JPS58110018A - Method and apparatus for manufacturing compound integral permanent magnet - Google Patents

Abstract

PURPOSE:To obtain a permanent magnet having high residual magnetic flux density by a method wherein a plurality of raw materials having different characteristics are filled in a plurality of molds by using partition members and then, the partition members are removed to make an integral compound mold. CONSTITUTION:The main body of a die 1 is supported by a plurality of shafts 9b fixed to the mobile panel 9a of a lower cylinder 10 and is moved up and down. The main body of the die 1 is provided with a molding cavity section 3, and the molding side wall is provided with suspension supply leading-in holes 13, 14, and a suspension compressor device is connected to a pipe. A plurality of molding cavity sections 3, 3a are filled with a plurality of suspension materials having different characteristics respectively at high pressure and are slightly compacted. After removing the partition members, a plurality of the molding cavity sections 3, 3a are formed as the same cavity section which is compacted and compressed to form one body, and a compound molding permanent magnet is obtained. In this way, a permanent magnet having high residual magnetic flux density can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manufacturing method and apparatus for compactly filtrating a suspension into a plurality of cavities and forming a composite integrally.

Conventionally, articles that are pressure-molded from suspensions have generally been made into single molded bodies, and in order to obtain the molded bodies, the suspension is removed through a filter and the article is compressed by compression embroidery. ing.

In recent years, permanent magnet rotating machines have great promise for being smaller, higher in performance, and higher in output. However, the effort to improve the output requires the use of a permanent magnet with a high residual magnetic flux density Br as a permanent magnet for the field, and on the other hand, when trying to improve the output, the demagnetizing field due to armature reaction increases, and the coercive force IHO is high. It becomes necessary to use it as a permanent magnet for a field with magnetic properties. The permanent magnet for this tanuni rotating machine takes advantage of the advantages of these permanent magnets, a permanent magnet with a high residual magnetic flux density Br, and a permanent magnet with a high coercive force IHO, which are combined and fixed in the housing. It is known to do so. (4
However, as shown in this example, when two permanent magnets are fixed to the housing in parallel, the work process becomes complicated and the number of man-hours required for assembly is increased. Even in this case, there is a drawback that it is difficult to improve the dimensional accuracy of the magnetic gap.

The present invention basically consists of filling a plurality of raw materials having the same structure and different characteristics into molds of multiple cavities using a partition member, removing the partition member, and producing a permanent magnet by integral composite molding. The purpose of the present invention is to provide a method for manufacturing permanent magnets and a manufacturing apparatus for manufacturing these permanent magnets.

The applicant has been making improvements to the molding of ferrite magnets and products thereof, and the present invention is also represented by Japanese Patent Application No. 50-48655. 50-157169 and 5
6- The present invention has been progressing with the production of composite molded permanent magnets and the improvement of equipment.0 The present invention is a method for manufacturing composite molded permanent magnets having two or more types of magnetic properties, in which a plurality of cavities are formed in advance using a partition member. After creating a section, multiple suspension materials with different properties are filled into each cavity section under high pressure in a magnetic field, compacted slightly, and then the previous partition member is removed, and the same cavity section is consolidated and filtered. A method for manufacturing a composite molded permanent magnet obtained by compressing the magnet into an integral shape, and a molded body with both ends open on the side wall of the mold.

In a press machine in which a molding space is formed by a lower punch, a suspension is also pressurized into the space under high pressure, and a molded article is obtained by gradually draining the liquid, a plurality of cavities are set in advance using partition members. An introduction hole for the suspension is provided in each cavity part in the side wall of the mold, and the upper punch and the SL side wall are first lowered, and then the partition member is removed, and the upper punch and the side wall of the mold are further moved to remove the partition member as well. The 4I feature is a composite molded permanent magnet manufacturing device that sequentially reduces the molding space using the spinning punch and side wall of the mold and pressurizes it.

Embodiments of the present invention will be described below. Figure 1 is a partial vertical cross-sectional view of the molding apparatus of the present invention, and Figure 2 is a partial vertical cross-sectional view of the manufacturing process using the molding apparatus shown in Figure #11. In the figure, 1 is a part of the die body.

The multiple axes 9 identified by the movable plate 9aK of the lower cylinder 10
b, and is movable up and down. Dice body 1
A molding cavity portion 5 is provided, a suspension supply introduction hole 15.14 is provided in the side wall of the mold, and a suspension pumping device (not shown) is connected to the introduction hole 13.14 via a pipe. . floor 8
The lower bunch 2 is supported on a pedestal Ba installed in y, and a partition member 2a is attached to a part of it so as to be moved up and down by a middle cylinder 11 installed on the pedestal 8a, and a plurality of molding cavities are formed. It has parts 5 and 3a. A gasket 12 such as an O-ring is attached to the outer periphery and joint portion of the lower punch 2 and the partition member 2m to prevent the suspension from leaking due to the suspension pressure in the molding cavity 6. The upper punch 4 fixed to the upper cylinder 7 is movable up and down so that it can be joined to the upper surface of the molding cavity part 3. A drain hole 5 is provided in the upper bunch 4, and the liquid medium of the suspension is discharged from the drain hole 5 to the outside of the molding cavity 5 through a liquid collecting chamber 6 and a drainage channel. The water will be drained out of the pupil after 16, so set it to 5. A magnetic field coil 17 is installed on the outer periphery of the molded body 1 to enable orientation when molding the magnetic material powder.

Next, to explain the operation of the manufacturing apparatus according to the present invention, first, the upper surface of the lower bunch 2 fixed to the pedestal 8a becomes the reference surface a, and with this as a reference, the partition member 2g, the mold side wall of the die body 1, and the filter body The nine-piece punch 4 is sequentially moved in the vertical direction via the shaft 15. First cylinder-1
0, the molding body 1 is moved through the shaft 9b on the moving plate 9a.
is increased by At.

The upper punch is lowered onto the surface of the die body 10B via the filter body 15. At the same time, in order to form a separate cavity part Sa, the middle cylinder 11 of the partition member 2a is moved to raise the upper surface of the partition member 2a to the upper surface, and the upper punch 4. Dice body 1 and partition member 2
It is formed using the mold a@wall and the lower punch 2, etc. Next, as shown in FIG. 2'(a), the suspension is pumped and the suspension (not shown) is fed under higher pressure through the introduction holes 15 and 14 of the die body 1 into the molding cavity 3. It is introduced into B'. While being introduced into a magnetic field, the liquid medium is sequentially transferred from the suspension to the diluting body 15 by the pumping pressure. The liquid is discharged from the liquid collection chamber 6 through the drainage hole 5 to the outside through the drainage channel 16, so to speak, preforming is progressing. The improving bunch 4 descends at a low speed due to the pressure of the upper cylinder 7, and the B side of the die body 1 is also pushed and descends at the same time, and the suspension is pumped until the introduction hole 15 is closed by the lower bunch 2. When the introduction hole 15.14 is closed, the pumping of the suspension is also stopped.

After preforming the lower punch face (FIG. 1), the two partition members are lowered by the middle cylinder 11, aligned with the A side of the lower punch 2, and the same cavity part is provided.

Further, the lowering of the upper punch 4 and the die body 1 is made a little faster, and at the same time, the floating pressure of the lower cylinder 10 and the middle cylinder 11 is gradually relieved, and the upper punch 4. Bottom/<Nchi 2
Pressure is applied between the moving punch 28 and the moving punch 28, and final pressurization is performed at →.At this point, the lower cylinder - 10° and the middle cylinder -
The floating pressure of 11 has been released to a pressure sufficient to support the weight of the die body 1, etc. At this point, the molded body X of the cavity part 5 filled on the right side and the molded body X of the cavity part 3 filled on the left side are released. The molded body Xt, which is the member ', is obtained as an integral molding, and the final pressurization is performed by the upper cylinder 7. All molding pressurization is completed by releasing the pressure. Furthermore, the die body 1 is moved by the lower cylinder 10.
is lowered at 6 Jt (see figure), and the molded body X is taken out of the die, completing one cycle.

In the above example, the explanation was given using a flat plate molded product, but it has been confirmed that the same method as described above can be carried out with a special ff1 (for example, arc-shaped) shown in Fig. 3 without changing the lower punch, upper punch, etc. . In addition, during molding of this molded body, 8i was added to one side of the molded body 20, and 9Sr 7 elite raw material '#+ (21 for high Br materials) was added to one side of the molded body 20, and 40% was added to the other side.
3 is added to make fc-8r ferrite raw material (for high IHO material 2
2) A composite molded body, which was a filled and consolidated integral molding, was obtained according to the above example. By firing this and assembling the integral composite permanent magnet into a rotating machine for field use, it is possible to greatly improve the performance of K11F by improving the output of the magnet-type rotating machine. Compared to the 20-50% demagnetization rate when a magnet is installed in a rotating machine, the present invention improves the demagnetization rate to 1% or less, simplifying the work process during magnet manufacturing and assembly, and improving efficiency. It also has many effects, including making a significant contribution.

[Brief explanation of the drawing]

Fig. 1 is a partial longitudinal cross-sectional view showing a molding apparatus according to the present invention, Fig. 2 is a partial longitudinal cross-sectional view showing the molding situation of an embodiment of the present invention, and Fig. 3 is a molding obtained by another embodiment. It is a cross section and a front view of the body. 1: Molding main body, 2: Lower punch, 2a: Moving punch, 5=
Cavity part, 4: upper punch, 13, 14: introduction point
1 figure

Claims (1)

[Claims] In a method for manufacturing a composite molded permanent magnet having 12 or more types of magnetic properties, a plurality of cavities are provided in advance using a partition member, and then a plurality of suspension materials having different properties are placed in each cavity. 1. A method for manufacturing a composite integral permanent magnet, characterized in that the cavity is filled with high pressure in a magnetic field and compacted slightly to form the partition member, and then the cavity is obtained. 2. The mold l of the molded body with both ends open! In a press machine, a molding space is formed by upper and lower bunches on the wall, a suspension is forced into the space under high pressure, and the liquid is gradually discharged to obtain a molded article. The upper punch is moved down the mold side wall, and after the partition member is removed, the upper punch is further moved down the mold side wall. An apparatus for manufacturing a composite integral permanent magnet, characterized in that pressure molding is performed by sequentially reducing a molding space using an excited upper punch including a partition member and a side wall of the mold.