JPS6029206B2 - Manufacturing method of magnetic pole body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic pole body comprising a pair of magnetic pole members coupled to each other with a non-magnetic member in between, and in particular,
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.

Conventionally, in a magnet-based magnetic block, a pair of magnetic pole members are arranged on both sides of the non-magnetic member with a non-magnetic member formed in a predetermined shape sandwiched between them, and the non-magnetic member and the both magnetic pole members are connected to each other. They are manufactured by integrally joining them using fasteners such as screws or rivets, or joining means such as projection welding or brazing.

The conventional manufacturing method includes a step of processing a non-magnetic member into a predetermined shape in advance as described above, and a step of joining a pair of magnetic pole members with the non-magnetic member formed in a predetermined shape sandwiched therebetween. It becomes necessary.

Further, in this joining process, misalignment is likely to occur between the respective members, and a finishing process such as cutting or grinding is required to correct this misalignment. Therefore, the object of the present invention is to
The purpose is to simplify the manufacturing process of magnetic pole bodies.

The present invention provides a method in which a hole is formed in each of a pair of magnetic pole members, and the holes open to mutually opposing surfaces of the magnetic pole members are formed, and both the magnetic pole members are interconnected via a non-magnetic member.
, by forming the non-magnetic member by casting using both the magnetic pole members positioned at a predetermined interval as part of a mold, and by forming the non-magnetic member and casting the part of the non-magnetic member into the hole. It is characterized in that the non-magnetic portion and both magnetic pole members are integrated.

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

FIG. 1 shows a magnet base 12 including a magnetic pole piece 10 obtained by the method according to the invention in an exploded state.

The magnet base 12 includes a magnetic pole body 10, a cylindrical permanent magnet 14 rotatably housed in a circular cavity 12' of the magnetic pole body and magnetized in all directions, and a magnet for rotating the permanent magnet. It includes a knob 16 and an end plate 17 for rotatably holding the knob, and as is well known in the art, by rotating the knob 16, the lower surface 10a of the magnetic pole body is energized or demagnetized. It will be done.

This magnet base 12 generally has its magnetic pole body 10
It is used to support a measuring instrument or the like supported via a column (not shown) provided on the upper surface of the magnetic plate or the like by the magnetic attraction force of the lower surface 10a. The permanent magnet 14
A pair of magnetic pole members 18 made of a magnetic material such as soft iron.
and a non-magnetic member 20 disposed between the magnetic pole members. The pair of magnetic pole members 18 are each formed into a predetermined shape by cold drawing or the like, and as shown in FIG. Said circular cavity 1 for accommodating a magnet
A recess 22 having an approximately semi-circular cross section is provided for locating 2'. Each of the recesses 22 is open at both ends to respective end faces of each magnetic pole member 18 .

On both sides of the recess 22 in the surface 18, there are a plurality of screw holes 2 each having one end open to the surface 18 and a closed end.
4 are formed, and the screw holes 24 extend parallel to each other. This screw hole 24 can be open at both ends, but in order to eliminate the need for a finishing process to close the other end of the screw hole to improve the appearance of the magnetic pole body 10 after casting a non-magnetic member, which will be described later, It is preferable to have a hole with the other end closed. The non-magnetic member 20' between the magnetic pole sections 18 is molded by casting using both magnetic pole sections 18 as part of a mold.

That is, both magnetic pole members 18 are assembled into a molding device (not shown) so that the recesses 22 face each other at a predetermined distance. In the recess 22 between the two magnetic pole parts 18 incorporated in the mold device layer, there is a cylindrical column having an outer diameter slightly larger than the outer diameter of the permanent magnet 14 in order to secure the circular cavity 12'. A core (not shown) is placed. After the core is placed, the space between the magnetic pole members 18 is filled with a non-magnetic molten metal such as aluminum or zinc, or a non-magnetic molten resin such as ABS synthetic resin, and by cooling the non-magnetic filling material, the non-magnetic member 20 is formed. The non-magnetic member 20 in which the magnetic pole member 18 described above is a part of the mold.
By casting, the non-magnetic member is integrally formed with a lid portion 26 that closes one end of the circular cavity 12' and a portion 28 that is cast into the screw hole 24, as shown in FIG.

This cast portion 28 is firmly screwed into each corresponding screw hole 24 due to shrinkage stress caused by cooling. Therefore, the non-magnetic member 20 for magnetically insulating both magnetic pole members 18
Simultaneously with the molding, both the magnetic pole members 18 can be integrally connected via the cast portion 28 of the non-magnetic member. The non-magnetic member 20 is preferably cast by so-called die casting, which is performed by applying pressure.

Further, when casting the non-magnetic member 20, a screw hole 32 for receiving the screw 30 for fixing the end plate 17 to the magnetic pole body 10 and a female screw hole 34 for receiving the column are formed in the non-magnetic member. It is preferable to do so. A strong tightening force is applied to the female screw hole 34 due to the screw engagement with the column, and this tightening force may cause a strong expansion force to act on the portion of the non-magnetic member 20 near the screw hole 34. In order to prevent deformation of the non-magnetic member 20 due to this expansion force, it is preferable to form the cast portions 28, which are the connecting portions with the magnetic pole village 18, on both sides of the female threaded hole 34 as shown in the figure. Further, instead of forming the lid part 26 integrally with the non-magnetic member 20 by molding the non-magnetic member 20, the lid part 26 can be formed separately from the non-magnetic member 20.

However, in order to further simplify the manufacturing process, it is preferable that the lid portion 26 is formed by integrally molding two non-magnetic members as described above. The screw hole 24 provided in the magnetic pole member 18 is made into a hollow hole 36 without a thread groove as shown in FIG. Magnetic pole member 18
and the non-magnetic portion 20 can be firmly coupled.

Further, by driving a punch 38 as shown in FIG. 3a from the open end of the hollow hole 36, a reduced portion 36a is formed in the hollow hole 36, as shown in FIG. 3b. This makes it possible to achieve even stronger coupling between the magnetic pole members 18 and the non-magnetic member 20.

Furthermore, instead of providing the anti-friction portion 36a, the axes of the pair of hollow holes 36 provided in each magnetic pole member 18 may be made non-parallel as shown in FIG. 4, or as shown in FIG. By intersecting the pair of hollow holes 36, it is possible to achieve a strong bond between the magnetic pole portions 18 and the non-magnetic member. According to the magnetic block-01 according to the present invention, both magnetic pole sections 18 can be integrally connected via the non-magnetic section at the same time as the non-magnetic member 20 is formed, thereby simplifying the manufacturing process. be able to.

Further, according to the magnetic block 10, the circular cavity 12 for the permanent magnet 14 is formed by casting the non-magnetic member 20.
Since ' is formed with high precision, the non-magnetic member 20 does not protrude into the circular cavity 12', and there is no need to cut or grind the inner peripheral surface of the circular cavity as in the conventional case.

Furthermore, by forming the lid part 26 for closing one end of the circular cavity integrally with the non-magnetic member 20, it is possible to eliminate the need for a step of closing one end of the circular cavity with a separate member.

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

According to the present invention, as described above, a pair of magnetic pole sections having holes formed in mutually opposing surfaces are used as part of a mold, and the non-magnetic section is cast between the two members. Both magnetic pole sections and the non-magnetic member can be strongly connected with high precision through the part of the non-magnetic member cast into the hole at the same time as the village is formed, thereby simplifying the manufacturing process, A magnetic pole body with high precision can be obtained at low cost.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a magnet base including a magnetic block according to the present invention, and FIG. 2 is a cross-sectional view taken along the line 0-Ro shown in FIG. , 3a, 3b, 4 and 5 are partial longitudinal sections of the magnetic pole member showing other embodiments of the holes provided in the magnetic pole member shown in FIGS. 1 and 2, respectively. It is a front view. 10...Magnetic pole body (magnetic block), 12'...
... circular cavity, 14 ... permanent magnet, 18 ...
...Magnetic pole member, 20...Nonmagnetic member, 22.
...Recess, 24, 26... Hole, 26...
... Lid part, 28 ... Casting part into the hole, 36a
...Reduction department. Figure 2 Figure 3 (o) Figure 3 (b) Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. In order to form holes in each of a pair of magnetic pole members that open to mutually opposing surfaces of the magnetic pole members, and to connect the two magnetic pole members to each other via a non-magnetic member, By forming the non-magnetic member by casting using both magnetic pole members positioned at a predetermined interval as part of a mold, the non-magnetic member and the non-magnetic member are sandwiched between them and are mutually bonded. A method of manufacturing a magnetic pole body comprising the pair of magnetic pole members coupled together. 2. The hole whose one end is open to the surface of the magnetic pole member is
The method for manufacturing a magnetic pole body according to claim 1, wherein the other end is a blind hole closed. 3. The method of manufacturing a magnetic pole body according to claim 1, wherein the hole is a screw hole. 4. The method of manufacturing a magnetic pole body according to claim 1, wherein the hole has a reduced diameter portion. 5. The method of manufacturing a magnetic pole body according to claim 1, wherein each of the magnetic pole members is provided with a plurality of the holes, and the axes of at least one pair of the holes in each magnetic pole member extend non-parallel to each other. 6. The method of manufacturing a magnetic pole body according to claim 1, wherein each of the magnetic pole members is provided with at least one pair of the holes, and the pair of holes in each of the magnetic pole members intersect with each other. 7. The magnetic pole body is a magnetic block for a magnet base, and both magnetic pole members are capable of rotating radially magnetized cylindrical permanent magnets on each of the mutually opposing surfaces. a recess having a semicircular cross section to define a circular cavity for accommodating the recess, the hole being formed on each side of the recess, and the recess defined by the pair of recesses during casting. 2. The method of manufacturing a magnetic pole body according to claim 1, wherein the core is placed within the circular cavity. 8. The recess of each magnetic pole member is open at both ends to each end face of each magnetic pole member, and a lid portion for closing one end of the circular cavity during casting of the non-magnetic member is integral with the non-magnetic member. A method for manufacturing a magnetic pole body according to claim 7, which is formed in a magnetic pole body according to claim 7. 9. The method of manufacturing a magnetic pole body according to claim 8, wherein the non-magnetic member is made of a non-magnetic metal material. 10. The method of manufacturing a magnetic pole body according to claim 8, wherein the non-magnetic member is made of a non-magnetic resin material.