WO2013015053A1

WO2013015053A1 - Device for producing field-pole magnet and method for producing same

Info

Publication number: WO2013015053A1
Application number: PCT/JP2012/065866
Authority: WO
Inventors: 泰久小池; 国朋石黒; 西村　公男; 一宏高市
Original assignee: 日産自動車株式会社
Priority date: 2011-07-27
Filing date: 2012-06-21
Publication date: 2013-01-31
Also published as: JP2013031264A; JP5935257B2

Abstract

In this device for producing a field-pole magnet, a magnet is placed on a protrusion as a contact section disposed at a bottom tool in a manner so as to extend in the widthwise direction of the magnet, and the magnet is segmented by causing a blade, which is the contact section of an top tool disposed parallel to the protrusion, to contact and apply pressure to the top of the magnet. The protrusion of the bottom tool and/or the blade of the top tool is capable of displacement tracking the surface shape of the magnet.

Description

Field pole magnet body manufacturing apparatus and method

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.

Formed by splitting a rectangular magnet body in plan view into a plurality of magnet pieces and bonding the magnet pieces together as a field pole magnet body disposed in the rotor core of a permanent magnet embedded rotating electrical machine The technology to do is known. Thus, by forming the field pole magnet body with a plurality of magnet pieces, 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).

In JP2009-148201A, an upper punch (upper die) having a notch extending in the magnet width direction, which is a guide for cleaving, is provided in advance in a magnet body having substantially the same size and shape as the rotor slot, and having a contact portion that comes into contact with the magnet body. ) And the lower punch (lower mold), the magnet body is cleaved and divided.

By the way, when the magnet body is cleaved into 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 occur due to stress other than the cleaving load acting on the magnet body, for example, when the abutment portion of the lower mold or upper mold hits the magnet body at the time of cleaving.

As described above, the factors that cause stresses other than the cleaving load on the magnet body are due to poor parallelism of the magnet body itself, warpage of the rough material, poor flatness of the rough material (roughness of the rough material surface), etc. When the magnet body is cleaved, it can be presumed that the magnet body comes into contact with the lower or upper mold contact portion at one point away from the center in the width direction of the magnet body and is supported in a floating state. Another factor that causes stresses other than the cleaving load on the magnet body is that foreign matter such as fine powder generated during cleaving is caught between the lower mold contact portion and the brittle magnet body. It is also assumed that when the magnet body is cleaved, the magnet body is supported in a floating state by contacting the lower mold contact portion with a foreign object at one point away from the center in the width direction of the magnet body. Can do.

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. And

In one embodiment, a field pole magnet body manufacturing apparatus places a magnet body on an abutting portion arranged in a lower mold so as to extend in the width direction of the magnet body, and is arranged in parallel with the abutting portion of the lower mold. The magnet body is cleaved by bringing the contact portion of the upper mold into contact with the upper portion of the magnet body and pressing it. In the field pole magnet body manufacturing apparatus, at least one of the lower mold contact portion and the upper mold contact portion can be displaced following the surface shape of the magnet body.

Embodiments of the present invention and advantages of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram illustrating 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 embodiment is applied. FIG. 2 is a configuration diagram showing the configuration of the magnet body. FIG. 3 is a schematic configuration diagram of a field pole magnet body manufacturing apparatus according to the first embodiment. FIG. 4 is an enlarged view of a main part of the magnet cleaving apparatus. FIG. 5 is a sectional view taken along line VV in FIG. FIG. 6 is a cross-sectional view showing the operating state of the magnet cleaving device. FIG. 7 is a cross-sectional view showing another operating state of the magnet cleaving device. FIG. 8 is a cross-sectional view showing a modification of the magnet cleaving device. FIG. 9 is a cross-sectional view showing another modification of the magnet cleaving apparatus. FIG. 10 is an enlarged view of a main part of the field pole magnet manufacturing apparatus according to the second embodiment. FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. FIG. 12 is a cross-sectional view showing the operating state of the magnet cleaving device. FIG. 13 is a cross-sectional view showing another operating state of the magnet cleaving device. FIG. 14 is an enlarged view of a main part of the field pole magnet body manufacturing apparatus according to the third embodiment. FIG. 15 is a sectional view taken along line XV-XV in FIG. FIG. 16 is a cross-sectional view showing an operating state of the magnet cleaving device. FIG. 17 is a cross-sectional view showing another operating state of the magnet cleaving device. FIG. 18 is an explanatory diagram for explaining an abnormal cracking state when the magnet body is cleaved. FIG. 19A is a diagram illustrating an example in which the biting position of the crushed powder is shifted to one side in the width direction on the short side to be cleaved. FIG. 19B is a diagram illustrating an example in the center in the width direction on the short side where the biting position of the crushed powder is cleaved. FIG. 19C is a diagram illustrating an example in which the crushing powder biting position is on the long side to be cleaved.

First, the field pole magnet body disposed in the rotor core of the rotating electrical machine will be described.

FIG. 1 is a schematic configuration diagram illustrating 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 embodiment is applied. In FIG. 1, the left diagram is a cross-sectional view of a permanent magnet motor, and the right diagram is a side view. In FIG. 1, a permanent magnet embedded type rotary electric machine A (hereinafter, simply referred to as “rotary electric machine”) is arranged in a ring-shaped stator 10 that constitutes a part of a casing (not shown), and coaxially arranged with the stator 10. And a cylindrical rotor 20.

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.

As shown in FIG. 2, the field pole magnet body 80 accommodated in the slot 22 of the rotor 20 is divided into a plurality of parts by splitting the rectangular magnet body 30 along the width direction in plan view in the thickness direction. It is configured as an assembly of magnet pieces 31. More specifically, the field pole magnet body 80 is configured as an aggregate of magnet pieces 31 aligned in a line by bonding the split sections of the plurality of magnet pieces 31 with the resin 32. For example, a resin 32 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.

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. Below, although the magnet body 30 in which the notch groove 33 is formed is demonstrated, this notch groove 33 is not indispensable. In other words, if it is possible to cleave without providing the notch groove 33, the magnet body 30 may not be provided with the notch groove 33. As the notch groove 33 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. In the following, it is assumed that the notch grooves 33 are provided at predetermined intervals in the longitudinal direction of the magnet body 30.

As a method for 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 by a dicer, a method of laser beam irradiation, etc. There is.

Hereinafter, a manufacturing apparatus and a manufacturing method of the field pole magnet body 80 used in the permanent magnet embedded type rotary electric machine A will be described based on each embodiment.

(First embodiment)
FIG. 3 is a schematic configuration diagram illustrating a magnet body cleaving apparatus that is a field pole magnet body manufacturing apparatus according to the first embodiment, and FIG. 4 is an enlarged view of a main part of the magnet cleaving apparatus. The magnet cleaving device 40 cleaves the magnet body 30 into a plurality of magnet pieces 31, and cleaves the blade body 61 by pressing the blade 61 against the positioned lower magnet 50 and the positioned magnet body 30. An upper mold 60 is provided. The magnet cleaving device 40 includes a positioning device 70 that sequentially moves the magnet body 30 supported by the lower mold 50 and sequentially positions the planned cleaving surface at the cleaving position.

The lower mold 50 that supports and guides the magnet body 30 includes a plurality of protrusions 51 extending on the upper surface corresponding to the extending direction of the cutout grooves 33 of the magnet body 30. On the upper surface of the protrusion 51, the magnet body 30 is supported from below. The lower die 50 includes a through hole 52 that opens downward at a position corresponding to the blade 61 of the upper die 60, and a pair of protrusions 51 serving as contact portions with the magnet body 30 before and after the through hole 52. Is arranged.

Of the pair of ridges 51, the ridge 51 that contacts the lower surface on the tip side of the magnet body 30 to be cleaved includes a foreign matter such as crushed powder, and includes the ridge 51. It is configured to be displaceable following the surface shape (in a direction substantially perpendicular to the surface of the magnet body 30). In the present embodiment, as one form of the structure that can be displaced following the surface shape of the magnet body 30, as shown in FIGS. 4 and 5, it is separated from the lower mold 50 and at the center in the width direction of the ridge 51. The shaft 53 arranged parallel to the feeding direction of the magnet body 30 is supported so as to be swingable with respect to the lower mold 50. FIG. 4 is an enlarged view of a main part of the magnet cleaving apparatus, and FIG. 5 is a cross-sectional view taken along the line VV of FIG.

For this reason, as shown in FIG. 6, the lower surface of the magnet body 30 has a lower mold due to poor parallelism of the rough material of the magnet body 30, warpage of the rough material, poor flatness of the rough material (roughness of the rough material surface), and the like. Even when tilted with respect to 50, the swingable ridge 51 swings following the lower surface of the magnet body 30. Further, even if foreign matter such as fine powder generated during cleaving is caught between the protrusion 51 of the lower mold 50 and the magnet body 30 which is a brittle material, as shown in FIG. The movable protrusion 51 swings following the lower surface of the magnet body 30 containing foreign matter. For this reason, in any case, the magnet body 30 can be reliably supported by the lower mold 50 without being lifted from the lower mold 50.

The upper mold 60 cleaves the positioned magnet body 30, so that the blade 61 that extends corresponding to the extending direction of the notch groove 33 of the magnet body 30 and the magnet spring that suppresses the magnet body 30 from jumping up during cleaving. And an ascent prevention clamp 62. The blade 61 as a contact portion to the magnet body 30 is lowered by the upper mold 60 and is pushed down while bringing the cutting edge into contact with the cleaving position of the magnet body 30, before and after the through hole 52 of the lower mold 50. The magnet body 30 is cleaved by bending by a three-point bend between the pair of protrusions 51. The blade 61 is provided with a sharp cutting edge facing the magnet body 30 arranged in the width direction of the magnet body 30, and in the case where foreign matter such as crushed powder is interposed, the blade 61 has the surface shape of the magnet body 30. It is configured to be able to follow and displace (in a direction substantially perpendicular to the surface of the magnet body 30). In the present embodiment, as one form of a structure that can be displaced following the surface shape of the magnet body 30, as shown in FIGS. 4 and 5, the magnet body is separated from the upper mold 60 and is located at the center in the width direction of the blade 61. The upper die 60 is supported so as to be swingable by a shaft 63 arranged in parallel with the feeding direction of 30.

For this reason, the upper surface of the magnet body 30 is inclined with respect to the upper mold 60 due to a poor parallelism of the rough material of the magnet body 30, warpage of the rough material, poor flatness of the rough material (irregularities on the surface of the rough material), and the like. Even so, the swingable blade 61 swings following the upper surface of the magnet body 30. Further, even when foreign matter such as fine powder generated at the time of cleaving is caught between the blade 61 and the magnet body 30 that is a brittle material, the swingable blade 61 of the magnet body 30 containing foreign matter is included. It swings following the top surface. For this reason, in any case, the blade 61 is bent by three-point bending between the pair of protrusions 51 before and after the through hole 52 of the lower die 50 without causing the blade 61 to come into contact with the magnet body 30. Thus, the magnet body 30 can be cleaved.

The magnet jump-up prevention clamp 62 is formed by a leaf spring whose base is fixed to the upper die 60, and presses the magnet body 30 against the lower die 50 by its spring action, thereby cleaving the magnet body 30 (particularly the magnet on the tip side). It suppresses that the piece 31) jumps up.

The positioning device 70 includes a pusher 71 that contacts the rear end of the magnet body 30 in the feeding direction and presses the magnet body 30; a holder 72 that contacts the front end of the magnet body 30 in the feeding direction and holds the magnet body 30; Is provided. The pusher 71 includes a servo motor that pushes out the magnet body 30, and every time the cleaving operation is executed, the pusher 71 is rotated by one pitch of the predetermined length set by the notch groove 33 (adjacent notch grooves 33 By repeating the pushing operation by the distance of (3), the planned cutting surface of the magnet body 30 is sequentially positioned at the cutting position.

Each time the holder 72 is pushed out by one pitch by the pusher 71, the holder 72 comes into contact with the front end of the magnet body 30 to apply a braking force to the magnet body 30, and the moving amount of the magnet body 30 pushed out by the pusher 71 is exceeded. The movement of the magnet body 30 is suppressed and the positioning accuracy of the magnet body 30 is improved. For this reason, when the magnet body 30 is cleaved, the holder 72 releases the contact with the front end of the magnet body 30 to allow the movement of the front end side magnet piece 31 cleaved from the magnet body 30.

In the magnet body cleaving device having the above-described configuration, the magnet body 30 is placed on the protrusion 51 of the lower mold 50, and the first cleaving schedule of the magnet body 30 is planned by the pusher 71 and the holder 72 of the positioning device 70. The surface is positioned between the pair of protrusions 51 of the lower mold 50 and the blade 61 of the upper mold 60.

After the magnet body 30 is positioned, the contact of the holder 72 with the magnet body 30 is released. Next, the upper die 60 is lowered, and the magnet jumping prevention clamp 62 provided on the upper die 60 comes into contact with the upper surface of the magnet body 30, so that the magnet body 30 is elastically attached to the protrusion 51 of the lower die 50. The magnet body 30 is pressed and held so as not to move.

As the upper die 60 is further lowered, the tip (lower end) of the blade 61 comes into contact with the cleaving position of the magnet body 30, and the three points between the pair of protrusions 51 before and after the through hole 52 of the lower die 50. The magnet body 30 is cleaved by being pushed down by bending. At the same time, the magnet body 30 is prevented from jumping up by the magnet jump-up prevention clamp 62.

By the way, when a pair of protrusion 51 is fixed to the lower mold | type 50 and the braid | blade 61 is fixed to the upper mold | type 60, the coarse parallelism defect of the magnet body 30 itself, a rough warp of a rough material, a rough material The lower surface and the upper surface of the magnet body 30 are inclined with respect to the lower mold 50 and the upper mold 60 due to poor flatness (irregularities on the surface of the rough material). When foreign matter such as crushed powder generated at the time of cleaving is caught between the pair of protrusions 51 of the lower mold 50 and the magnet body 30, as shown in FIG. 30 is in a state where it floats due to foreign matter, and the lower surface and the upper surface of the magnet body 30 are inclined with respect to the lower mold 50 and the upper mold 60. As described above, when the magnet body 30 is cleaved by the mold while the lower surface and the upper surface of the magnet body 30 are inclined with respect to the lower mold 50 and the upper mold 60, the upper mold 60 or the lower mold 50 is not attached to the magnet body 30. One-sided contact that contacts only at one point away from the center in the width direction occurs. As a result, the distribution of the stress input to the magnet body 30 is non-uniform between the one side and the other side with respect to the center in the width direction of the magnet body 30, and the upper mold 60 and the lower mold 50 are added to the magnet body 30 when cleaved. The torsional load acts, and on the short side (magnet piece 31 side) where the longitudinal dimension is short and the width direction rigidity is low, an abnormal crack having a split cross-section is formed, and the accuracy of the split section deteriorates.

That is, a description will be given with reference to FIG. 18 showing a state in which a foreign object is caught in the lower mold 50. The magnet body 30 includes, in addition to the tension 1 in the longitudinal direction of the magnet body 30 that is legitimately generated at the time of cleaving, Tension 2 is also generated in the 30-width direction. This tension 2 generates a torsional action that bends the magnet body 30 in the width direction, causing the magnet body 30 to be cleaved in the longitudinal direction as shown by a broken line in the figure, thereby causing abnormal cracks in the magnet body 30. . As described above, the size of the crushed powder (contamination) that causes abnormal cracking in the magnet body 30 is about 20 μm or more.

By the way, when the crushed powder is caught between the protrusion 51 of the lower mold 50 and the magnet body 30, the occurrence of abnormal cracking when the magnet body 30 is cleaved according to the biting position of the crushed powder. We confirmed how the rate changed. As the biting position of the crushed powder, when it is shifted to one side in the width direction of the short side to be cut (magnet piece 31 side) (FIG. 19A), the width direction of the short side to be cut (magnet piece 31 side) The case where it exists in the center (FIG. 19B) and the case where it exists in the long side (magnet body 30 side) to be cut (FIG. 19C) was assumed. Further, the size (size) of the crushed powder to be bitten was set to 0.14 [mm] larger than the assumed size. As a result of performing a plurality of cleaving experiments for each of the cases described above, in the case of FIG. 19A, abnormal cracks occurred in approximately 100% of the magnet body 30, but in the case of FIG. 19B, abnormal cracks occurred in the magnet body 30. Did not occur. In the case of FIG. 19C, abnormal cracks occurred in approximately 25% of the magnet body 30.

In consideration of the above results, when the crushed powder is bitten at a position shifted to one side in the width direction on the short side (magnet piece 31 side) to be cleaved (FIG. 19A), the magnet piece to be cleaved. Since the longitudinal dimension of 31 is small and the rigidity of the magnet piece 31 itself in the width direction is low, abnormal cracks are reliably generated. However, when the crushed powder is caught in the center position in the width direction on the short side (magnet piece 31 side) to be cut (FIG. 19B), the rigidity in the width direction of the cut magnet piece 31 itself is low. However, since the magnet piece 31 is supported by the crushed powder at the center in the width direction, there is no contact with the piece, resulting in no abnormal cracking. Further, when the crushed powder is caught on the long side to be cut (the magnet body 30 side) (FIG. 19C), the dimension in the longitudinal direction of the magnet body 30 is large, and the rigidity in the width direction of the magnet body 30 itself is large. In some cases, abnormal cracking did not occur in the magnet body 30 on the long side. However, also in this case, the magnet body 30 is supported by the pulverized powder so as to be inclined with respect to the ridge 51, and therefore, on the short side (magnet piece 31 side), the ridge 51 and the blade 61 are connected. It can be confirmed that abnormal cracks are generated with a low probability (25%) due to one piece.

However, in the magnet body cleaving apparatus of the present embodiment, as shown in FIG. 6, due to the rough parallelism of the magnet body 30 itself, the warp of the rough material, the flatness of the rough material (unevenness on the surface of the rough material), and the like. Even when the lower surface of the magnet body 30 is inclined with respect to the lower mold 50, the swingable protrusion 51 swings following the lower surface of the magnet body 30.

Further, in the magnet cleaving apparatus of the present embodiment, even when foreign matter such as crushed powder generated during cleaving is caught between the pair of protrusions 51 of the lower mold 50 and the magnet body 30 that is a brittle material, As shown in FIG. 7, the swingable ridge 51 swings following the lower surface of the magnet body 30 containing foreign matter.

As described above, in any case, the magnet body 30 is not lifted from the lower mold 50 (abutted at one point away from the center in the width direction of the magnet body 30) and is reliably supported by the lower mold 50. be able to. For this reason, the lower mold can be brought into contact with the surface of the magnet body 30 at at least two points that are separated from the center in the width direction of the magnet body 30 by an equal distance. 30 is not supported in a floating state.

That is, foreign matter is caught between the rough material parallelism failure of the magnet body 30 itself, the warp of the rough material, the poor flatness of the rough material (roughness of the rough material surface), and the protrusion 51 of the lower mold 50. Thus, even when the upper surface of the magnet body 30 is tilted with respect to the upper mold 60, the swingable blade 61 swings following the tilt of the upper surface of the magnet body 30. For this reason, the upper die can be brought into contact with the surface of the magnet body 30 at least at two points separated from the center of the magnet body 30 in the width direction by an equal distance. Thereby, the abnormal tension and torsional load in the width direction generated in the magnet body 30 at the time of cleaving can be suppressed, the occurrence of abnormal cracking of the magnet body 30 described above can be prevented, and the surface accuracy of the fractured surface can be improved. Can do.

After cutting, the blade 61 is raised together with the upper mold 60. Since the magnet body 30 is pressed by the magnet jump prevention clamp 62 provided in the upper mold 60, the cleaved portion of the magnet body 30 also rises and returns. When the upper die 60 returns to the initial position, the magnet jumping prevention clamp 62 provided in the upper die 60 also releases the contact with the upper surface of the magnet body 30 and releases the holding of the magnet body 30. The magnet piece 31 at the tip that is cleaved from the magnet body 30 is conveyed by a conveying device (not shown) in the next step, is aligned in the cleaving order, and is bonded and integrated through an adhesive.

Next, the pusher 71 of the positioning device 70 pushes the magnet body 30 by one pitch, and the holder 72 contacts the front end of the magnet body 30 to apply a braking force to the magnet body 30. Is positioned between the elevating member 81 and the blade 61 of the upper die 60.

Then, when the upper die 60 is lowered, the magnet body 30 is cleaved in the same manner as described above, and the operation of moving the magnet body 30 by one pitch by the positioning device 70 is repeated.

In the above-described embodiment, both the protrusion 51 and the blade 61 that contact the lower surface on the tip side of the magnet body 30 to be cleaved follow the surface shape of the magnet body 30 with respect to the lower mold 50 and the upper mold 60. As described above, what swings is described. However, any one of the protrusion 51 and the blade 61 that are in contact with the lower surface on the tip side of the magnet body 30 to be cut may be swung with respect to the lower die 50 or the upper die 60. For example, as shown in FIG. 8, only the protrusion 51 that contacts the lower surface of the tip of the magnet body 30 to be cut is supported so as to be swingable with respect to the lower mold 50, and the blade 61 is attached to the upper mold 60. It is good also as a structure fixedly supported. Further, as shown in FIG. 9, only the blade 61 that contacts the upper surface of the magnet body 30 to be cut is supported so as to be swingable with respect to the upper mold 60, and contacts the lower surface of the tip side of the magnet body 30 to be cut. The protruding ridge 51 may be configured to be fixedly supported on the lower mold 50.

If it does in this way, any one of the protrusion part 51 and the blade 61 which contacts the lower surface of the front end side of the magnet body 30 to be cut will swing and follow the lower surface or upper surface of the magnet body 30. . For this reason, a bending force biased in the width direction of the magnet body 30 acts by the blade 61 fixed to the upper mold 60 or the lower mold 50 or the protrusion 51 that contacts the lower surface on the tip side of the magnet body 30. However, the occurrence of the twisting action of bending the magnet body 30 in the width direction is alleviated due to the universal contact with the magnet body 30 from the opposite side. As a result, the occurrence of abnormal cracking of the magnet body 30 can be prevented, and the surface accuracy of the fractured surface can be improved.

In the present embodiment, the following effects can be achieved.

(A) At least one of the protrusion 51 as the contact portion of the lower die 50 and the blade 61 as the contact portion of the upper die 60 can be displaced following the surface shape of the magnet body 30. . For this reason, the lower surface and the upper surface of the magnet body 30 have the lower die 50 and the upper die 60 due to the roughness of the magnet body 30 itself, the roughness of the rough material, the warping of the rough material, the poorness of the flatness of the rough material, and foreign matter. Even when the ridge portion 51 is inclined with respect to the magnet body 30, at least one of the protrusion 51 that contacts the magnet body 30 and the blade 61 of the upper mold 60 uniformly contacts the lower surface or the upper surface of the magnet body 30. For this reason, the abutment of the abutting portions (the protruding portions 51 and the blades 61) with respect to the magnet body 30 is suppressed, the generation of a twisting action that bends the magnet body 30 in the width direction is alleviated, and the abnormal cracking of the magnet body 30 occurs. Can be prevented, and the surface accuracy of the split section can be improved.

(B) Of the protrusion 51 as the contact portion of the lower mold 50, the protrusion 51 that contacts the lower surface on the tip side that is cleaved as the magnet piece 31, and the blade 61 as the contact portion of the upper mold 60, Is separated from the lower mold 50 or the upper mold 60. Then, the separated protrusion 51 or blade 61 is supported by the lower die 50 or the upper die 60 in the width direction central portion so as to be swingable. For this reason, it is possible to reliably apply a cleaving load to the magnet body 30 while the ridges 51 or the blades 61 are made to follow the upper and lower surfaces of the magnet body 30 with a simple structure of support by the central portion in the width direction.

(Second Embodiment)
FIGS. 10 to 13 show a field pole magnet body manufacturing apparatus and a manufacturing method thereof according to the second embodiment. FIG. 10 is an enlarged view of a main part of the magnet cleaving apparatus according to the second embodiment, and FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. In the present embodiment, the upper blade or the lower-side magnet body short side ridge portion is divided into a plurality of portions in the width direction (extending direction of the notch groove 33), and each of the divided portions is supported in a floating manner. It is what. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

In the present embodiment, of the pair of ridge portions 51 of the lower mold 50, the ridge portion 51 (contact portion) that contacts the lower surface on the tip side of the magnet body 30 to be cleaved is as shown in FIGS. In addition, it is separated from the lower mold 50 and divided into a plurality of parts in the width direction. And each divided | segmented protrusion part 51 is supported by the lower mold | type 50 via the elastic body 54 provided in the lower end, for example, a spring, rubber | gum, etc. For this reason, each divided | segmented rib part 51 is float-supported by the lower mold | type 50 so that it can move below independently of each other.

For this reason, as shown in FIG. 12, the lower surface of the magnet body 30 has a lower die due to poor parallelism of the rough material of the magnet body 30, warpage of the rough material, poor flatness of the rough material (roughness of the rough material surface), and the like. Even in a state inclined with respect to 50, each of the divided protrusions 51 moves up and down following the lower surface of the magnet body 30. Further, even when foreign matter such as fine powder generated during cleaving is caught between the protrusion 51 of the lower mold 50 and the magnet body 30 which is a brittle material, as shown in FIG. Each of the projected ridges 51 moves up and down following the lower surface of the magnet body 30 including foreign matter. For this reason, in any case, the magnet body 30 is not lifted from the lower mold 50 (contacted at one point away from the center in the width direction of the magnet body 30) and can be reliably supported by the lower mold 50. it can.

Further, the blade 61 provided in the upper mold 60 is provided with a sharp cutting edge directed toward the magnet body 30 arranged in the width direction of the magnet body 30 and separated from the upper mold 60 as shown in FIGS. It is divided into a plurality in the width direction. Each of the divided blades 61 is supported by the upper mold 60 via an elastic body 64 provided at the upper end, for example, a spring or rubber. Therefore, each of the divided blades 61 is floatingly supported by the upper mold 60 so as to be movable upward independently of each other.

For this reason, the upper surface of the magnet body 30 is inclined with respect to the upper mold 60 due to a poor parallelism of the rough material of the magnet body 30, warpage of the rough material, poor flatness of the rough material (irregularities on the surface of the rough material), and the like. Even so, each of the divided blades 61 moves up and down following the upper surface of the magnet body 30. Further, even when foreign matter such as fine powder generated at the time of cleaving is placed on the upper surface of the magnet body 30 that is a brittle material, each of the divided blades 61 follows the upper surface of the magnet body 30 containing the foreign matter. Move up and down. For this reason, in any case, the magnet body 30 can be pressed and pushed down without contact with the magnet body 30.

In the above-described embodiment, both the protrusion 51 and the blade 61 that contact the lower surface on the front end side of the magnet body 30 to be cleaved are divided into a plurality of parts, which are respectively divided with respect to the lower mold 50 and the upper mold 60. Thus, the floating support by the elastic body has been described. However, either one of the protruding portion 51 and the blade 61 that contacts the lower surface of the tip side of the magnet body 30 to be cut is divided into a plurality of parts, and the

elastic body

54 or 64 with respect to the lower mold 50 or the upper mold 60. It is good also as a structure supported by floating. For example, only the protrusion 51 that contacts the lower surface on the tip side of the magnet body 30 to be cleaved is divided into a plurality of parts, and is float-supported by the elastic body 54 with respect to the lower mold 50, and the blade 61 is attached to the upper mold 60. It is good also as a structure fixedly supported. Further, only the blade 61 that comes into contact with the upper surface of the magnet body 30 to be cut is divided into a plurality of parts, and is float-supported by the elastic body 64 with respect to the upper mold 60, and is in contact with the lower surface on the tip side of the magnet body 30 to be cut. The protruding ridge 51 may be configured to be fixedly supported on the lower mold 50.

In this way, either one of the protrusion 51 and the blade 61 that contacts the lower surface of the tip of the magnet body 30 to be cleaved closely contacts the lower surface or the upper surface of the magnet body 30. For this reason, a bending force biased in the width direction of the magnet body 30 acts by the blade 61 fixed to the upper mold 60 or the lower mold 50 or the protrusion 51 that contacts the lower surface on the tip side of the magnet body 30. However, the occurrence of the twisting action of bending the magnet body 30 in the width direction is alleviated due to the universal contact with the magnet body 30 from the opposite side. As a result, the occurrence of abnormal cracking of the magnet body 30 can be prevented, and the surface accuracy of the fractured surface can be improved.

In the present embodiment, in addition to the effect (A) in the first embodiment, the following effects can be achieved.

(C) Of the ridges 51 as the contact portions of the lower mold 50, the ridge portions 51 that come into contact with the lower surface of the tip side that is cleaved as the magnet piece 31, and the blades 61 as the contact portions of the upper mold 60. Are separated from the lower mold 50 or the upper mold 60. And it divided | segmented into plurality in the width direction, and was supported in the floating state via the

elastic bodies

54 and 64 with respect to the lower mold | type 50 or the upper mold | type 60. FIG. For this reason, the lower surface and the upper surface of the magnet body 30 are caused by the roughness of the magnet body 30 itself, the roughness of the rough material, the warpage of the rough material, the flatness of the rough material (roughness of the surface of the rough material), and foreign matter. Even when tilted with respect to the lower mold 50 and the upper mold 60, at least one of the protrusion 51 and the blade 61 contacting the tip side of the magnet body 30 is on the lower surface or the upper surface of the magnet body 30. Contact finely and uniformly. For this reason, the contact of the abutting portion (the protruding portion 51 and the blade 61) with the magnet body 30 is suppressed, the generation of the twisting action that bends the magnet body 30 in the width direction is reduced, and the cleaving load is uniformly applied. Thus, the occurrence of abnormal cracking of the magnet body 30 can be prevented, and the surface accuracy of the fractured surface can be improved.

(Third embodiment)
14 to 17 show a field pole magnet body manufacturing apparatus and a manufacturing method thereof according to the third embodiment. FIG. 14 is an enlarged view of a main part of the magnet cleaving apparatus according to the third embodiment, and FIG. 15 is a cross-sectional view taken along line XV-XV in FIG. In the present embodiment, at least the tip end of the upper blade or the protrusion 51 on the short side of the lower magnet body is an elastic body. In addition, the same code | symbol is attached | subjected to the component same as the apparatus in 1st Embodiment, and the description is abbreviate | omitted or simplified.

In the present embodiment, among the pair of protrusions 51 of the lower mold 50, at least the distal end side of the protrusion 51 that contacts the lower surface of the distal end side of the magnet body 30 to be cut is as shown in FIGS. The elastic body 55 is made of, for example, rubber or silicon resin.

For this reason, as shown in FIG. 16, the lower surface of the magnet body 30 has a lower mold due to poor parallelism of the rough material of the magnet body 30, warpage of the rough material, poor flatness of the rough material (roughness of the rough material surface), and the like. Even in a state of being inclined with respect to 50, the distal end portion of the ridge portion 51 is deformed following the lower surface of the magnet body 30. Further, even when foreign matter such as fine powder generated during cleaving is caught between the protrusion 51 of the lower mold 50 and the magnet body 30 which is a brittle material, as shown in FIG. The distal end portion of the protrusion 51 that contacts the lower surface on the distal end side of the body 30 is deformed following the lower surface of the magnet body 30 including foreign matter. For this reason, in any case, the magnet body 30 is not lifted from the lower mold 50 (contacted at one point away from the center in the width direction of the magnet body 30) and can be reliably supported by the lower mold 50. it can.

Further, as shown in FIGS. 14 and 15, the tip side of the blade 61 provided on the upper mold 60 is made of an elastic body 65 such as rubber or silicon resin.

For this reason, the upper surface of the magnet body 30 is inclined with respect to the upper mold 60 due to a poor parallelism of the rough material of the magnet body 30, warpage of the rough material, poor flatness of the rough material (irregularities on the surface of the rough material), and the like. Even so, the tip of the blade 61 deforms following the upper surface of the magnet body 30. Further, even when foreign matter such as fine powder generated at the time of cleaving is placed on the upper surface of the magnet body 30 which is a brittle material, the tip of the blade 61 is deformed following the upper surface of the magnet body 30 containing foreign matter. . For this reason, in any case, the magnet body 30 can be pressed and pushed down without contact with the magnet body 30.

In the above-described embodiment, the lower end 50 and the upper mold 60 are provided with the end portions of both the protruding portion 51 and the blade 61 contacting the lower surface of the end of the magnet body 30 to be cleaved as the

elastic bodies

55 and 65. The floating support was explained. However, either one of the protruding portion 51 and the blade 61 that contacts the lower surface of the tip of the magnet body 30 to be cut is floatingly supported on the lower die 50 or the upper die 60 as an

elastic body

55 or 65. It is good also as a structure. For example, only the distal end portion of the protrusion 51 that contacts the lower surface on the distal end side of the magnet body 30 to be cut may be floatingly supported on the lower mold 50 as the elastic body 55. Alternatively, only the tip of the blade 61 that contacts the upper surface of the cleaved magnet body 30 may be floatingly supported by the upper mold 60 as the elastic body 65.

In this way, one of the protrusion 51 and the blade 61 contacting the lower surface of the tip side of the magnet body 30 to be cleaved closely follows the lower surface or upper surface of the magnet body 30 by the

elastic bodies

55 and 65. And abut. For this reason, a bending force biased in the width direction of the magnet body 30 acts by the blade 61 fixed to the upper mold 60 or the lower mold 50 or the protrusion 51 that contacts the lower surface on the tip side of the magnet body 30. Also, the

elastic body

55 or 65 contacts the magnet body 30 from the opposite side evenly. As a result, the generation of the twisting action of bending the magnet body 30 in the width direction is alleviated. As a result, the occurrence of abnormal cracking of the magnet body 30 can be prevented, and the surface accuracy of the fractured surface can be improved.

In this embodiment, in addition to the effect (A) in the first embodiment, the following effects can be achieved.

(D) Of the protrusions 51 as the contact portions of the lower mold 50, the protrusions 51 that contact the lower surface of the tip side that is cleaved as the magnet piece 31, and the blade 61 as the contact portion of the upper mold 60, The tip part which contacts at least one of the magnet bodies 30 is formed by the

elastic bodies

55 and 65. For this reason, the lower surface and the upper surface of the magnet body 30 are caused by the roughness of the magnet body 30 itself, the roughness of the rough material, the warpage of the rough material, the flatness of the rough material (roughness of the surface of the rough material), and foreign matter. Even when tilted with respect to the lower mold 50 and the upper mold 60, at least one of the protrusion 51 and the blade 61 contacting the tip side of the magnet body 30 is on the lower surface or the upper surface of the magnet body 30. It contacts finely and uniformly through the

elastic bodies

55 and 65. For this reason, the contact of the abutting portion (the protruding portion 51 and the blade 61) with the magnet body 30 is suppressed, the generation of the twisting action that bends the magnet body 30 in the width direction is reduced, and the cleaving load is uniformly applied. Thus, the occurrence of abnormal cracking of the magnet body 30 can be prevented, and the surface accuracy of the fractured surface can be improved.

This application claims priority based on Japanese Patent Application No. 2011-164457 filed with the Japan Patent Office on July 27, 2011, the entire contents of which are incorporated herein by reference.

Claims

The magnet body is placed on the abutting portion disposed in the lower mold so as to extend in the width direction of the magnet body, and the upper mold abutting portion disposed in parallel with the abutting portion of the lower mold is placed on the upper portion of the magnet body. In the field pole magnet body manufacturing apparatus that breaks the magnet body by contacting and pressing the magnet body,
A field pole magnet body manufacturing apparatus in which at least one of the lower mold contact section and the upper mold contact section can be displaced following the surface shape of the magnet body.
In the manufacturing apparatus of the magnetic body for field poles of Claim 1,
The contact portions arranged in the lower mold are a pair of contact portions spaced apart in the magnet length direction,
The upper mold contact portion is a field pole magnet body manufacturing apparatus that contacts a portion of the magnet body located between the pair of lower mold contact portions.
In the manufacturing apparatus of the field pole magnet body according to claim 1 or 2,
At least one of the abutment portion that contacts the lower surface on the tip side that is cleaved as the magnet piece and the abutment portion of the upper mold is separated from the lower mold or the upper mold. An apparatus for manufacturing a field pole magnet body whose center in the width direction is supported by a lower mold or an upper mold and is swingable with respect to the lower mold or the upper mold.
In the manufacturing apparatus of the field pole magnet body according to claim 1 or 2,
At least one of the abutment portion that contacts the lower surface on the tip side that is cleaved as the magnet piece and the abutment portion of the upper mold is separated from the lower mold or the upper mold. The field pole magnet body is divided into a plurality of pieces in the width direction and is supported in a floating state up and down with respect to the lower mold or the upper mold.
In the manufacturing apparatus of the field pole magnet body according to claim 1 or 2,
At least one of the abutting portion that contacts the lower surface of the tip side that is cleaved as a magnet piece among the abutting portions of the lower mold and the abutting portion of the upper mold is a tip portion that abuts on the magnet body. An apparatus for producing a field pole magnet body formed of an elastic body.
The magnet body is placed on the abutting portion arranged in parallel with the lower mold so as to extend in the width direction of the magnet body, and the abutting portion of the upper die arranged in parallel with the abutting portion of the lower mold is placed on the magnet body. In the manufacturing method of the magnetic body for field poles, which breaks the magnet body by pressing in contact with the upper part,
At least one of the lower mold contact portion and the upper mold contact portion can be displaced following the surface shape of the magnet body,
Placing the magnet body on the lower mold contact portion;
Contacting and pressing the upper mold contact portion with the upper part of the magnet body;
Cleaving the magnet body supported by the lower mold contact portion or the upper mold contact portion, which is displaced following the surface shape of the magnet body;
A method for manufacturing a field pole magnet body including: