EP0050303A1 - Process for manufacturing magnetic pole assembly - Google Patents
Process for manufacturing magnetic pole assembly Download PDFInfo
- Publication number
- EP0050303A1 EP0050303A1 EP81108300A EP81108300A EP0050303A1 EP 0050303 A1 EP0050303 A1 EP 0050303A1 EP 81108300 A EP81108300 A EP 81108300A EP 81108300 A EP81108300 A EP 81108300A EP 0050303 A1 EP0050303 A1 EP 0050303A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic pole
- magnetic
- members
- manufacturing
- pair
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
Definitions
- This invention relates to a process for manufacturing a magnetic pole assembly having a non-magnetic member and a pair of magnetic pole members coupled together with the non-magnetic member interposed therebetween, and more particularly to a process for manufacturing a magnetic pole assembly suited for a magnetic circuit block for a switchable permanent magnet device.
- a well known prior art process for producing a magnetic circuit block for a switchable permanent magnet device has been such that non-magnetic member is formed in a desired shape beforehand; then a pair of magnetic pole members are disposed with non-magnetic members of a desired configuration interposed therebetween,--and the pair of magnetic pole members and the non-magnetic member are integrally coupled each other by the tightening means, such as screws or rivets, or joining means, such as projection welding or brazing.
- the prior art process requires the steps of forming a non-magnetic member in a desired configuration, and coupling a pair of magnetic pole members each other, with the non-magnetic members of a desired configuration interposed therebetween.
- the prior art process has suffered from misalignment of one member from the other particularly in the coupling step, thus requiring a cutting or grinding step for making the surfaces of these components in alignment.
- a process for manufacturing a magnetic pole assembly having a non-magnetic member and a pair of magnetic pole members coupled together, with the non-magnetic member interposed therebetween comprises the steps of; providing holes with one open end in the opposing surfaces of the pair of magnetic pole members, respectively; forming non-magnetic member means between the pair of magnetic pole members by a molding process by using the pair of opposing magnetic pole members as part of the mold, whereby the non-magnetic member means is formed, and at the same time, the non-magnetic member means and the pair of magnetic pole members are coupled into a unitary body by non-magnetic materials cast into the holes in the pair of magnetic pole members.
- FIG. 1 there is shown in an exploded state a magnet base 12 including a magnetic pole assembly 10 which has been made by the process of the present invention.
- the magnet base namely switchable permanent magnet device 12, comprises a magnetic pole assembly 10, a columnar permanent magnet 14 rotatably received in a bore 12' in the magnetic pole assembly and magnetized in a diametrical direction, a knob 16 for rotating the permanent magnet, and an end plate 17 for holding the knob thereon rotatably.
- the knob 16 By turning the knob 16, the bottom surfaces 10a of the magnetic pole assembly 10 becomes magnetized or demagnetized, as is well known.
- the magnet base 12, in general, is used for supporting various instruments, such as measuring instruments, through the medium of a support pole or leg which is attached to the top surface of the magnetic pole assembly 10, which in turn is attached at the lower surfaces 10a thereof to a magnetic plate by magnetic attraction.
- the magnetic pole assembly 10 which is a magnetic circuit block for receiving the permanent magnet 14 rotatably, includes a pair of opposing magnetic pole members 18 made of a magnetic material, such as soft iron, and non-magnetic members 20 interposed therebetween.
- the pair of magnetic pole members 18 are respectively formed in a given configuration, for example, by a cold drawing process.
- recesses 22 Provided in the opposing surfaces 18a of the pair of magnetic pole members 18 are recesses 22 having a semi-circular cross section, so that these recesses cooperate to define the central bore 12' for receiving therein the permanent magnet 14, as best seen in Fig. 2.
- the recesses 22 are open from the opposite ends of the magnetic pole members 18, respectively.
- Plural pairs of threaded holes 24 are provided in the opposing magnetic pole members 18 in the upper and lower portions thereof i.e. on the both sides of each recess 22.
- One threaded hole 24 runs parallel to another threaded hole in each magnetic pole member, with one end open to the surface 18a, and with the other inner end closed. It is possible that each threaded hole 24 be open at the opposite ends thereof. However, in the latter case, after a non-magnetic material has been cast into each threaded hole, which will be described later, a finishing step for closing the other end of each threaded hole is required, so as to provide a neat appearance for the magnetic pole assembly 10.
- each threaded hole is a blind end.
- the non-magnetic members 20 between the opposing magnetic pole members 18 are formed by a molding process by using these magnetic pole members 18 as part of the mold. More in detail, the magnetic pole members 18 are incorporated in a molding device (not shown) in a manner that the recess 22 of one magnetic pole member 18 opposes the recess 22 of the other member at a given spacing therefrom. In order to ensure the bore 12', a columnar core (not shown), having an outer diameter slightly larger than the outer diameter of the permanent magnet 14, is placed in the central bore defined by the recesses 22 of the opposing magnetic pole members 18 incorporated in the molding device.
- non-magnetic molten metal such as aluminum or zinc
- non-magnetic molten resin such as ABS synthetic resin
- the non-magnetic members 20 are molded by using the magnetic pole members 18 as part of the mold, as described, a lid 26 closing one end of the bore 12' and molten materials 28 are simultaneously cast into the threaded holes 24 (herinafter referred to as cast portions) and are integrally formed with the respective non-magnetic members 20 in the manner shown in Fig. 1.
- the cast portions 28 are firmly retained in corresponding threaded holes 24 due to shrinkage stress resulting from the cooling of these portions.
- the opposing magnetic pole members 18 are integrally coupled together through the medium of the cast portions 28 of respective non-magnetic members 20.
- non-magnetic members 20 In order to form the non-magnetic members 20, it is preferable to employ so-called die casting. In case of forming the non-magnetic members 20, it is recommended to provide in the non-magnetic members tapped threaded holes 32 for receiving therein screws 30 for fixing the end plate 17 to the magnetic pole assembly 10 and a female threaded hole 34 for receiving the aforesaid support pole or leg. In this connection, a strong tightening force acts on the female threaded hole 34 when the support pole or leg is threadedly fitted therein, and the strong tightening force is developed into a strong expansion force which would act on the peripheral portion of the threaded hole.,34, of the non-magnetic member 20.
- the pair of cast portions 28 located on the opposite sides of the threaded hole 34 in the coupling portion between the opposing magnetic pole members 18 contribute to preventing the upper non-magnetic member 20 being deformed due to the strong expansion force.
- the lid 26 is formed integrally with the upper and lower non-magnetic members 20, the lid may be formed separately from the non-magnetic members 20. However, from the viewpoint of simplicity in manufacturing steps, it is recommended to form the lid 26 integrally with the non-magnetic members 20, as described above.
- the threaded holes 24 provided in respective magnetic pole member 18 may be holes 36 having no threads, as shown in Fig. 3(a). Also, in the case of the non-threaded holes, the opposing magnetic pole members 18 and the non-magnetic members 20 are firmly coupled together by the cast portions 28 due to shrinkage stress resulting from the cooling of these portions, likewise in the threaded holes.
- a diametrically reduced portion 36a is provided at the circumferential edge of the open end thereof, in the manner shown in Fig. 3(b).
- the diametrically reduced portions 36a of respective holes 36 ensure a stronger coupling between the magnetic pole members 18 and the non-magnetic members 20.
- a pair of holes 36 in each magnetic pole member 18 may run, with their axes running non-parallel, as shown in Fig. 4, or otherwise.
- the adjacent holes 36 may cross each other at the inner ends thereof, as shown in Fig. 5, with the result that a strong coupling between the opposing magnetic pole members and the non-magnetic members is ensured.
- the opposing magnetic nole members 18 are integrally coupled together through the medium of the non-magnetic members 20. The number of manufacturing steps is thus reduced.
- the bore 12' for receiving the permanent magnet 14 is provided with high accuracy by formation of the non-magnetic members 20, so that the non-magnetic members 20 have no likelihood of protruding into the bore 12'.
- a cutting or grinding step for the inner peripheral wall of the bore is no longer needed.
- lid 26 for closing one end of the bore 12' is formed integrally with the non-magnetic members 20, a step for closing the end of the bore by another material is eliminated.
- the non-magnetic member means is formed between the pair of opposing magnetic pole members having holes in the opposing surfaces thereof, by using the magnetic pole members as part of the mold, whereby the non-magnetic member means .is formed, and at the same time, the pair of opposing magnetic pole members and the non-magnetic member means are firmly coupled to each other with high accuracy through the medium of the cast portions in the aforesaid holes, whereby simplicity of the manufacturing process is attained and an inexpensive and highly accurate magnet assembly is obtained.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Electromagnets (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
Description
- This invention relates to a process for manufacturing a magnetic pole assembly having a non-magnetic member and a pair of magnetic pole members coupled together with the non-magnetic member interposed therebetween, and more particularly to a process for manufacturing a magnetic pole assembly suited for a magnetic circuit block for a switchable permanent magnet device.
- A well known prior art process for producing a magnetic circuit block for a switchable permanent magnet device has been such that non-magnetic member is formed in a desired shape beforehand; then a pair of magnetic pole members are disposed with non-magnetic members of a desired configuration interposed therebetween,--and the pair of magnetic pole members and the non-magnetic member are integrally coupled each other by the tightening means, such as screws or rivets, or joining means, such as projection welding or brazing.
- The prior art process requires the steps of forming a non-magnetic member in a desired configuration, and coupling a pair of magnetic pole members each other, with the non-magnetic members of a desired configuration interposed therebetween. The prior art process has suffered from misalignment of one member from the other particularly in the coupling step, thus requiring a cutting or grinding step for making the surfaces of these components in alignment.
- It is accordingly an object of the present invention to provide a process for manufacturing a magnetic pole assembly, which is reduced in number of manufacturing steps, for the simplicity sake.
- A process for manufacturing a magnetic pole assembly having a non-magnetic member and a pair of magnetic pole members coupled together, with the non-magnetic member interposed therebetween, according to the present invention, comprises the steps of; providing holes with one open end in the opposing surfaces of the pair of magnetic pole members, respectively; forming non-magnetic member means between the pair of magnetic pole members by a molding process by using the pair of opposing magnetic pole members as part of the mold, whereby the non-magnetic member means is formed, and at the same time, the non-magnetic member means and the pair of magnetic pole members are coupled into a unitary body by non-magnetic materials cast into the holes in the pair of magnetic pole members.
- The further features of the present invention will be apparent from the ensuing part of the specification taken in conjunction with the accompanying drawings which indicate an example of a magnetic pole assembly obtained according to the process of the present invention.
- Fig. 1 is an exploded perspective view of a magnet base including a magnetic circuit block, according to the present invention;
- Fig. 2 is a longitudinal cross sectional view taken along the line II-II of Fig. 1; and
- Figs. 3(a), 3(b), 4 and 5 are fragmentary longitudinal cross sectional views of magnetic pole members for illustration of holes of different types provided in the magnetic pole members, respectively.
- In Fig. 1, there is shown in an exploded state a
magnet base 12 including amagnetic pole assembly 10 which has been made by the process of the present invention. - The magnet base, namely switchable
permanent magnet device 12, comprises amagnetic pole assembly 10, a columnarpermanent magnet 14 rotatably received in a bore 12' in the magnetic pole assembly and magnetized in a diametrical direction, aknob 16 for rotating the permanent magnet, and anend plate 17 for holding the knob thereon rotatably. By turning theknob 16, thebottom surfaces 10a of themagnetic pole assembly 10 becomes magnetized or demagnetized, as is well known. Themagnet base 12, in general, is used for supporting various instruments, such as measuring instruments, through the medium of a support pole or leg which is attached to the top surface of themagnetic pole assembly 10, which in turn is attached at thelower surfaces 10a thereof to a magnetic plate by magnetic attraction. - The
magnetic pole assembly 10, which is a magnetic circuit block for receiving thepermanent magnet 14 rotatably, includes a pair of opposingmagnetic pole members 18 made of a magnetic material, such as soft iron, andnon-magnetic members 20 interposed therebetween. The pair ofmagnetic pole members 18 are respectively formed in a given configuration, for example, by a cold drawing process. Provided in theopposing surfaces 18a of the pair ofmagnetic pole members 18 are recesses 22 having a semi-circular cross section, so that these recesses cooperate to define the central bore 12' for receiving therein thepermanent magnet 14, as best seen in Fig. 2. - The
recesses 22 are open from the opposite ends of themagnetic pole members 18, respectively. Plural pairs of threadedholes 24 are provided in the opposingmagnetic pole members 18 in the upper and lower portions thereof i.e. on the both sides of eachrecess 22. One threadedhole 24 runs parallel to another threaded hole in each magnetic pole member, with one end open to thesurface 18a, and with the other inner end closed. It is possible that each threadedhole 24 be open at the opposite ends thereof. However, in the latter case, after a non-magnetic material has been cast into each threaded hole, which will be described later, a finishing step for closing the other end of each threaded hole is required, so as to provide a neat appearance for themagnetic pole assembly 10. - From the viewpoint of reduction of the number of manufacturing steps, it is desirable that the other (inner) end of each threaded hole is a blind end.
- The
non-magnetic members 20 between the opposingmagnetic pole members 18 are formed by a molding process by using thesemagnetic pole members 18 as part of the mold. More in detail, themagnetic pole members 18 are incorporated in a molding device (not shown) in a manner that the recess 22 of onemagnetic pole member 18 opposes therecess 22 of the other member at a given spacing therefrom. In order to ensure the bore 12', a columnar core (not shown), having an outer diameter slightly larger than the outer diameter of thepermanent magnet 14, is placed in the central bore defined by therecesses 22 of the opposingmagnetic pole members 18 incorporated in the molding device. After the core has been set in place, non-magnetic molten metal, such as aluminum or zinc, or non-magnetic molten resin, such as ABS synthetic resin, is filled into the gaps defined by the core and the opposingmagnetic members 18, and the non-magnetic material thus charged is then cooled, whereby non-magneticmembers 20 are formed in a predetermined configuration. - As the
non-magnetic members 20 are molded by using themagnetic pole members 18 as part of the mold, as described, alid 26 closing one end of the bore 12' andmolten materials 28 are simultaneously cast into the threaded holes 24 (herinafter referred to as cast portions) and are integrally formed with the respectivenon-magnetic members 20 in the manner shown in Fig. 1. Thecast portions 28 are firmly retained in corresponding threadedholes 24 due to shrinkage stress resulting from the cooling of these portions. As a result, simultaneous with formation of thenon-magnetic members 20 for magnetically insulating one magnetic pole member from another, the opposingmagnetic pole members 18 are integrally coupled together through the medium of thecast portions 28 of respectivenon-magnetic members 20. - In order to form the
non-magnetic members 20, it is preferable to employ so-called die casting. In case of forming thenon-magnetic members 20, it is recommended to provide in the non-magnetic members tapped threadedholes 32 for receiving thereinscrews 30 for fixing theend plate 17 to themagnetic pole assembly 10 and a female threadedhole 34 for receiving the aforesaid support pole or leg. In this connection, a strong tightening force acts on the female threadedhole 34 when the support pole or leg is threadedly fitted therein, and the strong tightening force is developed into a strong expansion force which would act on the peripheral portion of the threaded hole.,34, of thenon-magnetic member 20. The pair ofcast portions 28 located on the opposite sides of the threadedhole 34 in the coupling portion between the opposingmagnetic pole members 18 contribute to preventing the uppernon-magnetic member 20 being deformed due to the strong expansion force. - Although, in the embodiment shown, the
lid 26 is formed integrally with the upper and lowernon-magnetic members 20, the lid may be formed separately from thenon-magnetic members 20. However, from the viewpoint of simplicity in manufacturing steps, it is recommended to form thelid 26 integrally with thenon-magnetic members 20, as described above. - The threaded
holes 24 provided in respectivemagnetic pole member 18 may beholes 36 having no threads, as shown in Fig. 3(a). Also, in the case of the non-threaded holes, the opposingmagnetic pole members 18 and thenon-magnetic members 20 are firmly coupled together by thecast portions 28 due to shrinkage stress resulting from the cooling of these portions, likewise in the threaded holes. - If a
punch 38 as shown in Fig. 3(a) is forced onto thehole 36 from the open end thereof, then a diametrically reducedportion 36a is provided at the circumferential edge of the open end thereof, in the manner shown in Fig. 3(b). The diametrically reducedportions 36a ofrespective holes 36 ensure a stronger coupling between themagnetic pole members 18 and thenon-magnetic members 20. Instead of the diametrically reducedportions 36a, a pair ofholes 36 in eachmagnetic pole member 18 may run, with their axes running non-parallel, as shown in Fig. 4, or otherwise. Theadjacent holes 36 may cross each other at the inner ends thereof, as shown in Fig. 5, with the result that a strong coupling between the opposing magnetic pole members and the non-magnetic members is ensured. - In the magnetic circuit block according to the present invention, simultaneously with formation of the
non-magnetic members 20, the opposingmagnetic nole members 18 are integrally coupled together through the medium of thenon-magnetic members 20. The number of manufacturing steps is thus reduced. - According to the process for manufacturing the magnet block of the present invention, the bore 12' for receiving the
permanent magnet 14 is provided with high accuracy by formation of thenon-magnetic members 20, so that thenon-magnetic members 20 have no likelihood of protruding into the bore 12'. Thus, a cutting or grinding step for the inner peripheral wall of the bore is no longer needed. - Since the
lid 26 for closing one end of the bore 12' is formed integrally with thenon-magnetic members 20, a step for closing the end of the bore by another material is eliminated. - In the foregoing, we have set forth an example in which the process of the present invention is applied to the manufacture of a magnetic pole assembly used as a magnetic circuit block serving as a magnet base. The process of the present invention is not limited to the manufacture of the magnet assembly, but applicable for manufacturing various magnetic pole assemblies having no bore.
- In summing up, the non-magnetic member means is formed between the pair of opposing magnetic pole members having holes in the opposing surfaces thereof, by using the magnetic pole members as part of the mold, whereby the non-magnetic member means .is formed, and at the same time, the pair of opposing magnetic pole members and the non-magnetic member means are firmly coupled to each other with high accuracy through the medium of the cast portions in the aforesaid holes, whereby simplicity of the manufacturing process is attained and an inexpensive and highly accurate magnet assembly is obtained.
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP144455/80 | 1980-10-17 | ||
JP55144455A JPS6029206B2 (en) | 1980-10-17 | 1980-10-17 | Manufacturing method of magnetic pole body |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0050303A1 true EP0050303A1 (en) | 1982-04-28 |
EP0050303B1 EP0050303B1 (en) | 1985-05-02 |
Family
ID=15362642
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81108300A Expired EP0050303B1 (en) | 1980-10-17 | 1981-10-14 | Process for manufacturing magnetic pole assembly |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0050303B1 (en) |
JP (1) | JPS6029206B2 (en) |
KR (1) | KR850000858B1 (en) |
BR (1) | BR8100718A (en) |
DE (1) | DE3170319D1 (en) |
GB (1) | GB2085659B (en) |
IN (1) | IN153290B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010106409A1 (en) * | 2009-03-19 | 2010-09-23 | Robert Bosch Gmbh | Magnetic locking system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB523747A (en) * | 1938-12-03 | 1940-07-22 | Landis & Gyr Ag | Improvements in or relating to permanent brake magnets of high coercive force |
GB894518A (en) * | 1959-09-16 | 1962-04-26 | Ass Elect Ind | Improvements in or relating to permanent magnets |
GB1571057A (en) * | 1976-01-28 | 1980-07-09 | Sev Marchal | Magnetic circuits |
-
1980
- 1980-10-17 JP JP55144455A patent/JPS6029206B2/en not_active Expired
-
1981
- 1981-01-05 IN IN9/CAL/81A patent/IN153290B/en unknown
- 1981-01-14 GB GB8101005A patent/GB2085659B/en not_active Expired
- 1981-02-06 BR BR8100718A patent/BR8100718A/en not_active IP Right Cessation
- 1981-10-02 KR KR1019810003726A patent/KR850000858B1/en active
- 1981-10-14 EP EP81108300A patent/EP0050303B1/en not_active Expired
- 1981-10-14 DE DE8181108300T patent/DE3170319D1/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB523747A (en) * | 1938-12-03 | 1940-07-22 | Landis & Gyr Ag | Improvements in or relating to permanent brake magnets of high coercive force |
GB894518A (en) * | 1959-09-16 | 1962-04-26 | Ass Elect Ind | Improvements in or relating to permanent magnets |
GB1571057A (en) * | 1976-01-28 | 1980-07-09 | Sev Marchal | Magnetic circuits |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010106409A1 (en) * | 2009-03-19 | 2010-09-23 | Robert Bosch Gmbh | Magnetic locking system |
US8217743B2 (en) | 2009-03-19 | 2012-07-10 | Robert Bosch Gmbh | Magnetic locking system |
Also Published As
Publication number | Publication date |
---|---|
KR830008356A (en) | 1983-11-18 |
DE3170319D1 (en) | 1985-06-05 |
BR8100718A (en) | 1982-08-17 |
EP0050303B1 (en) | 1985-05-02 |
IN153290B (en) | 1984-06-30 |
KR850000858B1 (en) | 1985-06-17 |
JPS5769713A (en) | 1982-04-28 |
GB2085659A (en) | 1982-04-28 |
GB2085659B (en) | 1984-05-31 |
JPS6029206B2 (en) | 1985-07-09 |
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