JPS6355768B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a magnetic pole body suitable for manufacturing a magnetic pole body used as a magnet-based magnetic block.

The inventor of the present application previously disclosed in Japanese Patent Application No. 55-144455 that after forming a hole in each of a pair of magnetic pole members that opens on surfaces facing each other, both of the magnetic pole members were made into a part of a mold. A non-magnetic member is formed between opposing surfaces of both magnetic pole members by casting, thereby manufacturing a magnetic pole body that includes a non-magnetic member and a pair of magnetic pole members that are coupled to each other with the non-magnetic member interposed therebetween. proposed to do so.

According to the method, simultaneously with the molding of the non-magnetic member formed between the two magnetic pole members, the two magnetic pole members can be integrally coupled via the portion of the non-magnetic member cast into the hole. however,
In the method, it is necessary to drill holes in each of the magnetic pole members, and the holes are filled with the cast portion of the non-magnetic member, but magnetically the holes are filled with the holes. This results in large magnetic losses. Further, in order to obtain a strong bond between the non-magnetic member and the magnetic pole member, it is necessary to form a screw hole as the hole, or to form a plurality of holes in each magnetic pole member so as to cross each other as the hole. Therefore, it takes time to form the holes.

Therefore, an object of the present invention is to provide a method for manufacturing a magnetic pole body that can easily manufacture a magnetic pole body that does not cause magnetic loss.

In the present invention, before forming a non-magnetic member between a pair of magnetic pole members by casting the magnetic pole members as part of a mold, protrusions are formed on each of the mutually opposing surfaces of the magnetic pole members. By this, the non-magnetic member cast between the opposing surfaces and the protrusion surrounded by the non-magnetic member are engaged, thereby eliminating the need to form holes as described above in the magnetic pole member. The present invention is characterized in that, simultaneously with the formation of the non-magnetic member, both the magnetic pole members are integrally and firmly connected via the non-magnetic member.

Furthermore, in the present invention, instead of forming the protrusions on the mutually opposing surfaces of the magnetic pole member, a net member is fixed, and thereby the non-magnetic member and the non-magnetic member are cast between the opposing surfaces. By engaging the net member surrounded by the magnetic member, both the magnetic pole members can be inserted through the non-magnetic member at the same time as the non-magnetic member is formed, without forming holes as described above in the magnetic pole member. It is characterized by being strongly connected together.

The features of the present invention will become clearer from the following description of the illustrated embodiments.

FIG. 1 shows a magnetic pole body 10 obtained by the method according to the invention. In the illustrated example, the magnetic pole body 10 is a magnet-based magnetic circuit block, and is arranged between a pair of magnetic pole members 12 made of a magnetic material such as soft iron, as is well known in the art. and a non-magnetic member 14.
A circular cavity is provided in the center of the mutually opposing surfaces of both magnetic pole members 12 for rotatably accommodating a conventionally well-known radially magnetized cylindrical permanent magnet (not shown). A semicircular recess 16 is provided to define the magnetic field, and the magnetic pole faces 18 of both magnetic pole members 12 coupled via the non-magnetic member 14 are energized and demagnetized by the rotation operation of the permanent magnet. You can switch to the state of

Each of the magnetic pole members 12 of the magnetic pole body 10 is formed into a predetermined shape having the recess 16 by cold drawing or the like, and the non-magnetic member 14 between the magnetic pole members 12 is formed as described below. It is formed by casting using both magnetic pole members 12 as part of a mold.

Prior to casting the non-magnetic member 14, as shown in FIG. is a plurality of protruding members 22 made of magnetic or non-magnetic material.
are fixed to each other at intervals. Each protruding member 2
2 is provided at the rising portion 22a and the tip of the rising portion, and extends radially outwardly from the surface 20.
Each metal member 2 is a metal member consisting of a flange portion 22b extending along the
2, each protrusion is formed.

It is preferable to use resistance welding to fix the metal members 20, and as shown in FIG. The holding tape 24 is fed to the resistance welding machine 28 and the magnetic pole member 12 is fed to the resistance welding machine 28.
By interlocking the feeding operation with the operation of both electrodes 30 and 32 of the welding machine, it is possible to automate the fixing of the metal member 22 to the magnetic pole member 12, that is, the formation of the protrusion.

Each protrusion 22 of both magnetic pole members 12
As shown in FIGS. 2 and 2, when the protrusions 22 are formed at positions facing each other, the height of each protrusion 22 is limited to less than half the distance a between the two magnetic pole members 12, but as shown in FIG. As shown, by mutually shifting the formation positions of the protrusions 22 of each magnetic pole member 12 along the central axis of the circular cavity, each protrusion 2
2 can be made equal to or more than half the value of the distance a. When the protrusions 22 are made of a magnetic metal member, it is necessary to provide a space between the respective protrusions 22 formed on both magnetic pole members 12 in order to keep both magnetic pole members 12 in a state of magnetic isolation from each other. When made of magnetic metal material, adjacent sides of the protrusions 22 of both magnetic pole members 12 may be brought into contact with each other.

Both magnetic pole members 12 are assembled into a molding device (not shown) so that the surfaces 20 on which the protrusions 22 are formed are opposed to each other with the predetermined distance a therebetween. A cylindrical core having an outer diameter slightly larger than the outer diameter of the permanent magnet is placed in the recess 16 of the magnetic pole member 12 incorporated in the mold device to ensure the circular cavity. . Thereafter, non-magnetic molten metal such as aluminum or zinc or non-magnetic molten resin such as ABS synthetic resin is filled between the opposing surfaces 20 of both magnetic pole members 12 to fill the gap, and the non-magnetic filling material is cooled. The non-magnetic member 14 is formed by the following steps.

The non-magnetic member 14 is preferably cast by so-called die casting, which is performed by applying pressure.
A lid member (not shown) that closes one end of the circular cavity can be molded simultaneously with the casting of the non-magnetic member.

Each non-magnetic member 1 cast between the opposing surfaces 20
4 surrounds therein the protrusion 22 protruding from both opposing surfaces 20, and is firmly coupled to the protrusion by thermal contraction accompanying cooling. Therefore, both magnetic pole members 12 can be integrally coupled via the non-magnetic member at the same time as the non-magnetic member 14 is formed between the two magnetic pole members 12, without forming the holes that cause magnetic loss in both magnetic pole members 12. can do.

The flange portion 22b of the projection 22 can be made unnecessary. However, both magnetic pole members 12
As described above, it is preferable to form the flange portion 22b on the rising portion 22a extending from the surface 20 in order to obtain a stronger connection against external forces acting in a direction that separates the flange portions from each other.

Further, the protrusion member 22 constituting the protrusion can be formed of a synthetic resin material, and in this case, the protrusion member can be fixed to the opposing surface with an adhesive or the like. However, in order to quickly and easily fix the protrusion member 22 to the opposing surface 20, resistance welding is used as the fixing means, and the protrusion member 22
It is preferable to use a metal member as described above. When the magnetic member 12 is formed by casting or forging, protrusions similar to those described above can be integrally formed during molding of the magnetic member.

As the protrusion members similar to those described above, metal members as shown in FIGS. 5 to 9 can be used.

The L-shaped metal member 34 shown in FIG. 5 has an end face of one side 34a fixed to the surface 20, and one side 34a and the other side 34b of the member 34 are raised portions of protrusions similar to those described above. and constitute the flange part. The crank-shaped metal member 36 shown in FIG.
, and its central portion 36b and other side 36
c respectively constitute a rising portion and a flange portion similar to those described above. The metal member 38 shown in FIG. 7 is fixed to the surface 20 at the base 38a from which the claw is punched, and the base 38b and tip 38c of the claw punched from the base 38a are raised portions similar to those described above. and constitute the flange part. The bending metal member 40 shown in FIG. 8 includes a central portion 40a and both side portions 40c connected to bent portions 40b on both sides of the central portion, and is fixed to the surface at both side portions. The bent portion 40b and the central portion 40a respectively constitute a rising portion and a flange portion similar to those described above. The bent metal member 40 shown in FIG. 9 has a shape similar to that shown in FIG. 40c respectively constitute a rising portion and a flange portion similar to those described above.

The protrusion shown in FIG.
2, one side 42a is fixed to the surface 20, and the other side 42b is formed with a through hole 44 extending along the surface 20. This through hole 4
4 receives a part of the non-magnetic member 14 therein, thereby making the connection between the non-magnetic member 14 and the protrusion 42, that is, the magnetic pole member 12 stronger.

Instead of forming the protrusions described above on the opposing surface 20, as shown in FIG. Can be fixed. In order to use resistance welding as a fixing means for the net member 46, it is preferable to use an expanded metal, a wire mesh made of intersecting metal wires, or a metal plate made of a perforated punched iron plate, etc., as the net member. As shown in FIG. 11, it is preferable that an intervening object such as a sphere 48 be placed between the wire mesh 46 and the surface 20 to create a space between a portion of the wire mesh 46 and the surface 20. The distance ensures that a portion of the non-magnetic member is guided between the wire mesh 46 and the surface 20 during casting of the non-magnetic member, and prevents the connection between the non-magnetic member 14 and the wire mesh 46, that is, the magnetic pole member 12. Make it stronger. For this purpose, a corrugated wire mesh can be used as the wire mesh.

The magnetic circuit block obtained by the method according to the present invention does not have a magnetic void filled with a non-magnetic material in each magnetic pole member serving as a magnetic path, so that there is no large magnetic loss. will not invite Therefore, the substantial magnetic force of the magnet base provided with the magnetic circuit block can be increased. Furthermore, since the circular cavity for the permanent magnet is formed with high precision by casting the non-magnetic member, finishing steps such as cutting or grinding the inner circumferential surface of the circular cavity can be made unnecessary. .

In the above, an example in which the present invention is applied to the production of a magnetic pole body used as a magnet-based magnetic circuit block has been described, but the present invention is not limited to this, and the present invention is applicable to a circular cavity for a permanent magnet as described above. It can be applied to the production of various magnetic pole bodies that do not have.

According to the present invention, both magnetic pole members can be firmly connected to each other via the non-magnetic member at the same time as forming the non-magnetic member between the two magnetic pole parts without forming holes in the magnetic pole member as described above. In addition to simplifying the manufacturing process, it is possible to provide a magnetic pole body with high manufacturing precision at a low cost without causing magnetic loss.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a magnetic circuit block according to the present invention, FIG. 2 is a perspective view showing the magnetic pole member shown in FIG. 1, and FIG. 3 is a cross-sectional view showing the magnetic pole member shown in FIG. FIG. 4 is a plan view showing a magnetic pole member according to another embodiment of the present invention, and FIGS.
Each figure is a perspective view showing a part of a magnetic pole member according to another embodiment of the present invention. 10: magnetic pole body (magnetic circuit block), 12: magnetic pole member, 14: non-magnetic member, 20: opposing surface, 2
2, 34, 36, 38, 40, 42: protrusion, 22
b, 34b, 36c, 38c, 40a, 40c:
Flange portion, 44: Through hole, 46: Mesh member (wire mesh).

Claims (1)

[Scope of Claims] 1. A method for manufacturing a magnetic pole body comprising a non-magnetic member and a pair of magnetic pole members coupled to each other with the non-magnetic member interposed therebetween, wherein each of the pair of magnetic pole members faces each other. forming a protrusion on the surface of the magnetic pole member, and casting the magnetic pole members positioned at a predetermined distance from each other as part of a mold in order to connect the magnetic pole members to each other via a non-magnetic member. . A method of manufacturing a magnetic pole body, comprising forming a non-magnetic member surrounding the protrusion between the surfaces. 2. The method of manufacturing a magnetic pole body according to claim 1, wherein the protrusion is formed by fixing a protrusion member to the surface. 3. The method of manufacturing a magnetic pole body according to claim 2, wherein the protruding member includes a flange portion extending substantially parallel to the surface to which the protruding member is fixed at a distance from the surface. 4. The method of manufacturing a magnetic pole body according to claim 2, wherein the protrusion member includes a through hole extending along the surface to which the protrusion member is fixed. 5. A method for manufacturing a magnetic pole body comprising a non-magnetic member and a pair of magnetic pole members coupled to each other with the non-magnetic member interposed therebetween, the method comprising: fixing the net members along the line, and casting the two magnetic pole members positioned at a predetermined distance from each other as part of a mold in order to connect the two magnetic pole members to each other via a non-magnetic member. A method for manufacturing a magnetic body, comprising forming a non-magnetic member surrounding the net member between the surfaces. 6. The method of manufacturing a magnetic pole body according to claim 5, wherein a portion of the net member is separated from the surface to which the member is fixed.