WO2013047298A1 - 界磁極用磁石体の製造装置およびその製造方法 - Google Patents
界磁極用磁石体の製造装置およびその製造方法 Download PDFInfo
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- WO2013047298A1 WO2013047298A1 PCT/JP2012/073977 JP2012073977W WO2013047298A1 WO 2013047298 A1 WO2013047298 A1 WO 2013047298A1 JP 2012073977 W JP2012073977 W JP 2012073977W WO 2013047298 A1 WO2013047298 A1 WO 2013047298A1
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- Prior art keywords
- magnet body
- punch
- width direction
- magnet
- manufacturing
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 239000000463 material Substances 0.000 claims description 44
- 238000003825 pressing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 230000001902 propagating effect Effects 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 description 11
- 238000005520 cutting process Methods 0.000 description 10
- 230000000644 propagated effect Effects 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012508 resin bead Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F3/00—Severing by means other than cutting; Apparatus therefor
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F3/00—Severing by means other than cutting; Apparatus therefor
- B26F3/002—Precutting and tensioning or breaking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F3/00—Severing by means other than cutting; Apparatus therefor
- B26F3/02—Tearing
-
- 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
- H01F41/0253—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 for manufacturing permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T225/00—Severing by tearing or breaking
- Y10T225/10—Methods
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T225/00—Severing by tearing or breaking
- Y10T225/30—Breaking or tearing apparatus
- Y10T225/371—Movable breaking tool
- Y10T225/379—Breaking tool intermediate spaced work supports
- Y10T225/386—Clamping supports
Definitions
- the present invention relates to an apparatus for manufacturing a field pole magnet body disposed in a rotor core of a permanent magnet embedded rotary electric machine and a method for manufacturing the same.
- a rectangular magnet body (hereinafter simply referred to as a magnet body) in plan view is divided into a plurality of magnet pieces.
- a field pole magnet body formed by adhering magnet pieces together is known.
- the volume of each magnet piece is reduced, and the eddy current generated by the fluctuation of the acting magnetic field is reduced. This suppresses the heat generation of the field pole magnet body caused by the eddy current, and prevents irreversible thermal demagnetization (see JP2009-148201A).
- JP2009-148201A a magnet body in which a plurality of cutting surfaces are provided with incisions in advance is arranged between a punch having a convex polygonal surface and a die having a concave polygonal surface, and the punch is used as a die. By pushing inward, the magnet body is cleaved along each cleaved planned surface to create a plurality of magnet pieces.
- the accuracy of the cleaved surface may deteriorate due to abnormal cracking in which the cleaved surface of the magnet piece deviates from the planned cutting surface or becomes bifurcated. This is presumed to be caused by the contact of the upper punch that is biased and abutted against one of the width direction of the magnet body (the direction along the split section) at the time of cleaving.
- the factors that cause the upper punch to come into contact with the magnet body biased in the width direction are as follows: poor parallelism of the upper and lower molds, poor parallelism of the magnet body itself, coarse material warpage, coarse material Due to poor flatness (irregularities on the surface of the rough material).
- the present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus for manufacturing a field pole magnet body disposed on a rotor core of a rotating electrical machine and a method for manufacturing the same, which are suitable for improving the accuracy of a split section.
- a field pole magnet body manufacturing apparatus is an apparatus that cleaves a magnet body by pressing an upper mold punch against a magnet body fixed on a lower die. At least one convex portion is formed on the punch of the mold symmetrically with respect to the central position in the magnet body width direction.
- FIG. 1 is a schematic configuration diagram showing a configuration of a main part of a permanent magnet type electric motor to which a magnet body manufactured by a field pole magnet body manufacturing apparatus according to the present invention is applied.
- the left figure is a sectional view of a permanent magnet type motor
- the right figure is a side view.
- a permanent magnet embedded type rotary electric machine AA (hereinafter simply referred to as “rotary electric machine”) is arranged in a ring-shaped stator 10 constituting a part of a casing (not shown), and coaxially arranged with the stator 10.
- a cylindrical rotor 20 is arranged in a ring-shaped stator 10 constituting a part of a casing (not shown), and coaxially arranged with the stator 10.
- the stator 10 includes a stator core 11 and a plurality of coils 12.
- the plurality of coils 12 are accommodated in slots 13 formed at equal angular intervals on the same circumference around the axis O in the stator core 11.
- the rotor 20 includes a rotor core 21, a rotating shaft 23 that rotates integrally with the rotor core 21, and a plurality of field pole magnet bodies 80.
- the plurality of field pole magnet bodies 80 are accommodated in slots 22 formed at equal angular intervals on the same circumference around the axis O.
- the field pole magnet body 80 housed in the slot 22 of the rotor 20 has a plurality of parts divided by cleaving the rectangular magnet body 30 along the width direction in plan view in the thickness direction.
- the magnet pieces 31 are configured as an aggregate of magnet pieces 31 aligned in a row by bonding the cut sections with a resin 32.
- a resin 32 used for example, a resin having a heat resistance of about 200 ° C. is used, and the adjacent magnet pieces 31 are electrically insulated from each other. For this reason, the eddy current generated by the fluctuation of the acting magnetic field is reduced by staying in the individual magnet pieces 31, the heat generation of the field pole magnet body 80 due to the eddy current is suppressed, and irreversible thermal demagnetization is prevented. To do.
- a notch groove 33 In order to cleave the magnet body 30 into the plurality of magnet pieces 31, it is effective to form a notch groove 33 in advance at a site where the magnet body 30 is to be cleaved.
- this notch groove 33 is not indispensable.
- the notch groove 33 may not be provided in the magnet body 30.
- the notch groove 33 to be provided is deeper from the surface and the sharpness of the tip of the notch groove 33 is sharper, the flatness of the cut section when cleaved as the magnet piece 31 is improved.
- a method of forming the notch groove 33 As a method of forming the notch groove 33, a method of forming the magnet body 30 by a groove forming protrusion provided in the mold of the magnet body 30, a method of machining such as a dicer or a slicer, or the like by laser beam irradiation. There are methods, wire cut electric discharge machining and the like.
- the provided magnet body 30 has its surface tilted in the width direction due to its own coarse material parallelism defect, coarse material warpage, coarse material flatness defect (roughness on the rough material surface), etc. Some of them protrude in the width direction with respect to the other.
- the punch When the punch is pressed against such a magnet body 30 for cutting, the punch hits one side in the width direction of the magnet body 30 (the distribution of stress input from the punch to the magnet body 30 is The width of the body 30 is not uniform between the one side and the other side of the width direction), and the cracked surface may be shifted from the planned cutting surface or an abnormal crack may be formed in a bifurcated shape. .
- the present invention provides a field pole magnet body manufacturing apparatus and a method for manufacturing the same, which is provided with a punch suitable for improvement in one-piece contact with respect to the magnet body 30.
- FIGS. 3 and 4 are schematic configuration diagrams showing a magnet body cleaving apparatus 40 that is a field pole magnet body manufacturing apparatus according to an embodiment to which the present invention is applied.
- the outline of the magnet body cleaving apparatus 40 of FIGS. 3 and 4 will be described, and then the configuration of the punch applicable to both of the magnet body cleaving apparatus 40 of FIGS. 3 and 4 will be described.
- This magnet cleaving device 40 includes a pair of dies 41 as lower molds that bridge and mount the magnet body 30, and a magnet fixing jig 43 that fixes the magnet body 30 at adjacent ends of the pair of dies 41. .
- type 50 which cleaves the magnet body 30 by pushing in the part over which the magnet body 30 was spanned is provided.
- the magnet fixing jig 43 is a jig that fixes the magnet body 30 by pressing the magnet body 30 toward the edges of the pair of dies 41, and presses the magnet body 30 by bolt fastening, hydraulic pressure, or air pressure.
- the punch 51 presses the portion of the magnet body 30 that spans the pair of dies 41 downward, thereby breaking the magnet body 30 along the notch groove 32 of the magnet body 30.
- the punch 51 is driven by, for example, a servo press, a mechanical press, a hydraulic press, or the like.
- the magnet body breaking device 40 is configured as described above, and the magnet body 30 provided with the grooves 32 is placed over the upper surfaces of the pair of dies 41.
- the magnet body 30 is placed on the pair of dies 41 so that a desired position to be cleaved, that is, a notch groove 32 provided in advance in a cleaved surface is located on the side facing the die 41 side. .
- the magnet body 30 is fixed by the magnet fixing jig 43 in a state of being positioned so as to be positioned at the center of the portion where the notch groove 32 as the planned cutting surface is bridged. Further, the magnet body 30 is broken and divided along the notch groove 32 by lowering the punch 51.
- the fixation by the magnet fixing jig 43 is released, and the magnet piece 31 is fed by the length of one magnet piece 31 (the distance of the adjacent notch groove 32).
- the magnet body 30 is divided into a plurality of magnet pieces 31.
- This magnet cleaving device 40 pushes a die 42 on which the magnet body 30 is placed, a magnet fixing jig 44 that fixes the magnet body 30 at the end of the die 42, and a portion of the magnet body 30 that protrudes from the die 42. And a punch 51 for cleaving the magnet body 30.
- the magnet fixing jig 44 is a jig that fixes the magnet body 30 by pressing it toward the die 42, and presses the magnet body 30 by bolt fastening or hydraulic pressure.
- the punch 51 presses a portion protruding from the die 42 of the magnet body 30 downward, thereby breaking the magnet body 30 along the notch groove 32 of the magnet body 30.
- the punch 51 is driven by, for example, a servo press, a mechanical press, a hydraulic press, or the like.
- the magnet dividing jig 40 is configured as described above, and the magnet body 30 provided with the notch grooves 32 is placed on the upper surface of the die 42.
- the magnet body 30 is placed on the die 42 so that a desired position to be cleaved, that is, a notch groove 32 provided in advance on the cleaved surface is located on the upper surface opposite to the die 42 side. .
- alignment is performed in a state where the magnet piece 31 protrudes from the right end of the die 42 by the length of one magnet piece 31 (the distance of the adjacent notch groove 32).
- the magnet body 30 is fixed. Further, the magnet body 30 is divided along the notch groove 32 by lowering the punch 51. By repeating the above operation, the magnet body 30 is divided into a plurality of magnet pieces 31.
- the punch 51 according to this embodiment applied to the magnet body breaking device 40 shown in FIGS. 3 and 4 described above is formed symmetrically with respect to the center in the width direction of the magnet body 30 as shown in FIGS. , At least one convex portion 52 is provided.
- the magnet body 30 is positioned at the center in the width direction and has a single protrusion 52.
- the height of the convex portion 52 shown in FIG. 5 is exaggerated, and the height of the convex portion 52 in practical use is the parallelism of the coarse material as the magnet body 30, the warp of the coarse material,
- the flatness of the material is set to a height equal to or greater than the tolerance dimension set.
- the height of the convex portion 52 By setting the height of the convex portion 52 in this way, even if there is a tolerance in the parallelism of the rough material as the magnet body 30, the warp of the rough material, and the flatness of the material (the rough surface of the rough material), punching is possible.
- the 51 convex portions 52 can be brought into contact with the center position in the width direction of the magnet body 30.
- Inertia is applied in the direction to cancel
- the inertial force due to the mass of the magnet body 30 is large on the long side where the length in the longitudinal direction is long and large on the left and right sides of the surface to be cleaved, and is small on the short side where the length is short and the mass is short (magnet piece 31). Generated.
- the resultant force of the tension and the inertial force is unbalanced between the long side and the short side, and the fracture surface is cleaved from the magnet body 30 and separated. It will be in the state where it will warp to the short side. In such a case, an abnormal crack in which the fractured surface of the magnet body 30 deviates from the planned fracture surface or becomes a bifurcated shape occurs, resulting in a worsened fractured surface accuracy.
- the convex portion 52 provided on the punch 51 prevents the occurrence of contact with each other when the magnet body 30 is cleaved, and can reliably contact the central portion in the width direction of the magnet body 30.
- a crack can be generated from the central position in the width direction with respect to the magnet body 30 in contact. The crack generated in the central portion is propagated to both sides of the magnet body 30 in the width direction, and when the crack reaches the both side portions, the magnet body 30 is cleaved on the planned cutting surface. And since the generation
- the portion 52 can be reliably brought into contact with the central portion in the width direction of the magnet body 30. For this reason, with respect to the magnet body 30 which contacts, a crack can be generated from the center position in the width direction. For this reason, the crack generated in the central portion is propagated to both sides of the magnet body 30 in the width direction, and the magnet body 30 can be cleaved at the planned cleaving surface when the crack reaches the both sides.
- the cleaved magnet pieces 31 are bonded between the cleaved sections using an adhesive according to the cleaved order and are integrated again to form a field pole magnet body 80.
- an adhesive an epoxy thermosetting adhesive, a UV curable adhesive, a two-component room temperature curable adhesive, or the like can be used.
- spacers such as glass beads, resin beads, and insulation cloth are blended in the adhesive.
- attaching the magnet piece 31 using an adhesive agent has a spring force or more than three directions (at least two directions of an arrangement direction and a thickness direction) of an arrangement direction, a thickness direction, and a width direction.
- the magnet pieces 31 are aligned by pressing with a pressing force such as hydraulic pressure or pneumatic pressure.
- the punch 51A of the second embodiment shown in FIG. 6 includes a convex portion 52A that protrudes in an arc shape toward the central portion of the magnet body 30 in the width direction.
- the height of the convex portion 52A shown in FIG. 6 is exaggerated, and the height of the convex portion 52A in practical use is the parallelism of the coarse material as the magnet body 30, the warp of the coarse material, The height is set to be equal to or greater than the tolerance dimension set for the flatness of the material (roughness on the surface of the rough material).
- the arc-shaped convex portion 52 ⁇ / b> A of 51 ⁇ / b> A strongly abuts at the center position in the width direction of the magnet body 30. And it can contact
- the arc-shaped convex portion 52A provided on the punch 51A does not come into contact with each other when the magnet body 30 is cleaved, but strongly contacts the central portion in the width direction of the magnet body 30, As it moves to both sides, it can be made to weaken gradually. For this reason, a crack can be reliably generated from the central position in the width direction with respect to the magnet body 30.
- the crack generated in the central portion is propagated to both sides of the magnet body 30 in the width direction, and when the crack reaches both sides, the magnet body 30 can be cleaved at the planned cleaving surface. As a result, it is possible to prevent the occurrence of abnormal cracks that are displaced from the fractured plane of the fractured surface or become bifurcated, and the accuracy of the fractured surface can be improved.
- the punch 51B of the third embodiment shown in FIG. 7 includes convex portions 52B that protrude at two locations in the width direction of the magnet body 30.
- the two convex portions 52B are provided at the center position of the region obtained by dividing the width dimension of the magnet body 30 into two, that is, at 1/4 and 3/4 positions. That is, the two convex portions 52 ⁇ / b> B are formed symmetrically with respect to the center in the width direction of the magnet body 30.
- the height of the convex portion 52B shown in FIG. 7 is exaggerated, and the height of the convex portion 52B in practical use is the parallelism of the coarse material as the magnet body 30, the warp of the coarse material, The height is set to be equal to or greater than the tolerance dimension set for the flatness of the material (roughness on the surface of the rough material).
- this punch 51B it connects with the upper mold
- the two protrusions 52B provided on the punch 51B are prevented from hitting each other by swinging following the surface state of the magnet body 30 by the support shaft 53 when the magnet body 30 is cleaved.
- the magnetic body 30 can be made to abut evenly and strongly at two locations of 1/4 and 3/4 in the width direction. For this reason, a crack can be reliably generated in the magnet body 30 from the center position of the region in which the width direction is divided into two, and the generated crack is propagated to both sides in the width direction of the magnet body 30. And the crack which propagates to the width direction center side of the magnet body 30 merges in the width direction center part of the magnet body 30, and the crack which propagates to the width direction both sides of the magnet body 30 reaches each side part.
- the time when the cracks merge at the center side and the time when the cracks reach both sides can be made simultaneously, and at this point, the magnet body 30 can be cleaved on the planned cleaving surface.
- the magnet body 30 can be cleaved on the planned cleaving surface.
- the punch of the fourth embodiment shown in FIG. 8 includes convex portions 52C that protrude at four locations in the width direction of the magnet body 30.
- the four convex portions 52C are provided at the center positions of the respective regions obtained by dividing the width of the magnet body 30 into four. That is, the four convex portions 52 ⁇ / b> C are formed symmetrically with respect to the center of the magnet body 30 in the width direction.
- the height of the convex portion 52C shown in FIG. 8 is exaggerated, and the height of the convex portion 52C in practical use is the parallelism of the coarse material as the magnet body 30, the warp of the coarse material, The height is set to be equal to or greater than the tolerance dimension set for the flatness of the material (roughness on the surface of the rough material).
- the punch 51C is composed of two punch pieces 51C1 and 51C2 on one side and the other side in the width direction of the magnet body 30.
- Each punch piece 51 ⁇ / b> C ⁇ b> 1 and 51 ⁇ / b> C ⁇ b> 2 includes two convex portions 52 ⁇ / b> C that protrude toward the magnet body 30 at both ends thereof.
- the punch pieces 51C1 and 51C2 are connected to the punch support member 54 via support shafts 53C1 arranged in a lateral direction orthogonal to the width direction of the magnet body 30 at an intermediate position between the two convex portions 52C. .
- the punch support member 54 is connected to the upper die 50 via a support shaft 53C2 arranged in the lateral direction perpendicular to the width direction of the magnet body 30 at an intermediate position of the support shaft 53C1 that supports the punches 51C1 and 51C2. ing.
- the punches 51C1 and 51C2 can swing around the support shaft 53C1.
- the punch support member 54 is connected to the upper die 50 via the support shaft 53C2, so that the punches 51C1 and 51C2 can swing around the support shafts 53C1 and 53C2.
- the two punches 51C1 and 51C2 move up and down along the surface shape on one side in the width direction of the magnet body 30 at the time of cleaving, and both the two convex portions 52C are even on the surface of the magnet body 30. It can be made to contact.
- the two convex portions 52C provided on the two punches 51C1 and 51C2 oscillate following the surface state of the magnet body 30 by the support shafts 53C1 and 53C2 when the magnet body 30 is cleaved. .
- the cracks propagating in the width direction of the magnet body 30 merge with the cracks generated by the adjacent convex portions 52C and propagating in the width direction, respectively, and the cracks propagating to both sides in the width direction of the magnet body 30 are on the respective sides. Reach the department.
- the time when the cracks merge and the time when the cracks reach both sides can be set at the same time.
- the magnet body 30 can be cleaved along the planned cleaving surface. As a result, it is possible to prevent the occurrence of abnormal cracks that are displaced from the fractured plane of the fractured surface or become bifurcated, and the accuracy of the fractured surface can be improved.
- the punch 51D of the fifth embodiment shown in FIG. 9 is applied when the width dimension of the magnet body 30 is relatively small, and has two convex portions 52D that abut on both side edges of the magnet body 30 in the width direction.
- the two convex portions 52 ⁇ / b> D are formed symmetrically with respect to the center in the width direction of the magnet body 30.
- the two convex portions 52D that are in contact with both side edges in the width direction of the magnet body 30 protrude toward the both sides in the width direction of the magnet body 30 at both ends of the punch 51D, and the inner edges facing each other are above each other. It is inclined in a “C” shape that approaches and separates from each other below.
- the punch 51D is connected to the upper die 50 via a support shaft 53D arranged in a lateral direction orthogonal to the width direction of the magnet body 30 at an intermediate position between the two convex portions 52D.
- the punch 51D can swing around the support shaft 53D. For this reason, punch 51D can be made to contact
- the two convex portions 52D provided on the punch 51D are caused to swing by following the edges on both sides in the width direction of the magnet body 30 by the support shaft 53D when the magnet body 30 is cleaved. Can be prevented, and the both sides of the magnet body 30 in the width direction can be evenly contacted. For this reason, a crack can be reliably generated from both side edges in the width direction of the magnet body 30, and the generated crack is propagated toward the center in the width direction of the magnet body 30. And the crack which propagates toward the center of the width direction of the magnet body 30 merges in the center part, and the magnet body 30 can be cleaved by the planned cutting surface at that time. As a result, it is possible to prevent the occurrence of abnormal cracks that are displaced from the fractured plane of the fractured surface or become bifurcated, and the accuracy of the fractured surface can be improved. In the present embodiment, the following effects can be achieved.
- the split section of the magnet piece 31 may deviate from the planned cutting surface. Occurrence of abnormal cracks that are bifurcated can be prevented. As a result, it is possible to improve the split cross-sectional accuracy of the magnet piece 31. In addition, since it is not required to increase the parallelism of the upper and lower molds, it is possible to easily manufacture and manage the molds.
- the punch 51B shown in FIG. 7 has two convex portions 52B symmetrically with respect to the central position in the width direction of the magnet body 30, and can swing with respect to the upper die about the intermediate position between the two convex portions 52B. It is supported by. For this reason, even if the rough parallelism defect of the magnet body 30, the warp of the rough material, the flatness of the raw material (unevenness on the surface of the rough material), etc. exist, the two convex portions 52B provided on the punch 51B are When the magnet body 30 is cleaved, swinging follows the surface state of the magnet body 30 to prevent one-piece contact. As a result, the effect (A) described above is improved.
- the two convex parts 52B shown in FIG. 7 are arranged at the center position of the area obtained by dividing the width dimension of the magnet body 30 into two parts. For this reason, it is possible to reliably generate a crack from the center position of the region in which the width direction of the magnet body 30 is divided into two. The generated crack propagates to both sides in the width direction of the magnet body 30 and merges at the center in the width direction of the magnet body 30, and the crack propagated to both sides in the width direction of the magnet body 30 reaches each side portion. To do.
- the time when the crack merges on the center side and the time when the crack reaches both sides can be made at the same time, and it can prevent the occurrence of abnormal cracks that are misaligned or bifurcated from the fractured plane of the fractured surface, The accuracy of the fractured section can be improved.
- a punch 51C shown in FIG. 8 includes a punch support member 54 that can swing with respect to the upper mold 50 around the center position in the width direction of the magnet body 30, and the center of the area obtained by dividing the width dimension of the magnet body 30 into two.
- the punch support member 54 is formed with a pair of punches 51C1 and 51C2 that can swing around the position.
- the convex part 52C is arrange
- the two convex portions 52C provided on the two punches 51C1 and 51C2 are caused to swing by following the surface state of the magnet body 30 by the support shafts 53C1 and 53C2 when the magnet body 30 is cleaved.
- the contact can be prevented, and the magnet body 30 can be uniformly and strongly abutted at the center position of each region obtained by dividing the width direction of the magnet body 30 into four.
- the time when the cracks merge and the time when the cracks reach both sides can be set at the same time. At this time, the magnet body 30 can be cleaved on the planned cutting surface, It is possible to prevent the occurrence of misalignment and abnormal cracking, and to improve the accuracy of the fractured surface.
- the convex portion 52 has a height equal to or higher than the tolerance set for the coarse material parallelism of the magnet body 30, the warp of the coarse material, and the uneven flatness of the material surface. For this reason, even if the rough parallelism of the magnet body 30, the warp of the rough material, the flatness of the raw material (irregularities on the surface of the rough material), etc. exist, the convex portion 52 is reliably applied to the surface of the magnet body 30. Can be touched.
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- Life Sciences & Earth Sciences (AREA)
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Abstract
Description
本実施形態においては、以下に記載する効果を奏することができる。
Claims (7)
- 下型ダイ上に固定された磁石体に、上型のパンチを当接させて押圧することにより磁石体を割断する界磁極用磁石体の製造装置において、
上型のパンチに、磁石体幅方向中央位置に対して対称に、少なくとも一つ以上の凸部を形成した界磁極用磁石体の製造装置。 - 請求項1に記載の界磁極用磁石体の製造装置において、
前記パンチは、磁石体幅方向中央位置に対して対称に2つの凸部を備え、2つの凸部の中間位置を中心として上型に対して揺動可能に支持されている界磁極用磁石体の製造装置。 - 請求項2に記載の界磁極用磁石体の製造装置において、
前記2つの凸部は、磁石体の幅寸法を2分割した領域の中央位置に配置されている界磁極用磁石体の製造装置。 - 請求項1に記載の界磁極用磁石体の製造装置において、
前記パンチは、磁石体幅方向中央位置を中心として上型に対して揺動可能なパンチ支持部材と、磁石体の幅寸法を2分割した領域の中央位置を中心としてパンチ支持部材に揺動可能な一対のパンチとを備え、
前記一つ以上の凸部は、磁石体の幅寸法を4分割した領域の中央位置に配置して前記一対のパンチに二個ずつ設けられている界磁極用磁石体の製造装置。 - 請求項1から請求項4のいずれか一つに記載の界磁極用磁石体の製造装置において、
前記凸部は、磁石体の粗材平行度、粗材の反り、素材表面の凹凸平面度について設定された公差以上の高さを備える界磁極用磁石体の製造装置。 - 下型ダイ上に固定された磁石体に、上型のパンチを当接させて押圧することにより磁石体を割断する界磁極用磁石体の製造方法において、
上型のパンチに磁石体幅方向中央位置に対して対称に、少なくとも一つ以上の凸部を備えるよう形成し、
前記パンチの凸部の数により磁石体を幅方向に分割する領域の中央位置において前記パンチの凸部を磁石体の上面に当接させ、
前記パンチを磁石体に押付けることにより当接部位の磁石体に亀裂を発生させ、
前記発生された亀裂を幅方向に伝播させることにより磁石体を割断する界磁極用磁石体の製造方法。 - 請求項6に記載の界磁極用磁石体の製造方法において、
前記パンチは、磁石体幅方向中央位置に対して対称に一つ以上の凸部を備え、両端位置の凸部の中間位置を中心として上型に対して揺動可能に支持されている界磁極用磁石体の製造方法。
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