JP5994280B2 - Manufacturing method and manufacturing apparatus of magnet piece constituting magnet body for field pole - Google Patents

Description

  The present invention relates to a method and an apparatus for manufacturing a magnet piece constituting a field pole magnet body.

  Conventionally, Patent Document 1 discloses a method of manufacturing a permanent magnet in which the permanent magnet is cleaved and the cleaved permanent magnet is fitted to restore the permanent magnet. By using the permanent magnet restored by the manufacturing method disclosed in Patent Document 1 for a motor or the like, eddy currents generated when the motor is driven can be suppressed.

JP 2009-148201 A

  In Patent Document 1, a permanent magnet is disposed between a curved upper punch and a curved lower punch, the distance between the lower punch and the upper punch is shortened, and bending stress is applied to the cleaving site using the principle of three-point bending. In addition, cracks are advanced from the lower surface to the upper surface of the permanent magnet to cleave the permanent magnet.

  However, in the above invention, compressive stress is generated on the upper surface side of the permanent magnet, the progress of the crack is hindered by the compressive stress, and the crack of the permanent magnet deviates from the planned cutting surface, or abnormal cracks that become bifurcated. There is a problem that it occurs.

  The present invention has been invented in order to solve such problems, and has an object of cleaving a permanent magnet on a cleaved surface.

A method of manufacturing a magnet piece constituting a field pole magnet body according to an aspect of the present invention includes splitting a magnet body on a planned splitting plane set perpendicular to the longitudinal direction by a cleaving means , and It is a manufacturing method of the magnet piece which comprises a body. The method of manufacturing the magnet pieces constituting the field pole magnet body is provided with contact members that come into contact with both sides of the upper surface to be cut facing the cleaving means of the magnet body, and the cleaving means for cleaving the magnet body is lowered . In conjunction with this , the abutting member is pressed against the upper surface of the magnet body and moved from the planned cutting surface toward the end in the longitudinal direction, and the longitudinal end of the magnet body from the planned cutting surface to the upper surface side of the magnet body. While applying a stress toward , a bending stress is applied to the magnet body by the cleaving means to cleave the magnet body.

According to this aspect , the crack progresses away from the planned cutting surface by cleaving the magnet body by the cleaving means while applying stress to the upper surface of the magnet body toward the longitudinal end of the magnet body by the contact member. This can be suppressed and the fractured surface of the magnet body can be made smooth. The working process can be reduced by applying stress to the upper surface of the magnet body toward the longitudinal end of the magnet body by the contact member in conjunction with the lowering of the cleaving means. Moreover, a magnet body breaking device can be reduced in size.

It is a schematic block diagram of the permanent magnet embedding type rotary electric machine using the field pole magnet body of this embodiment. It is a schematic block diagram of the magnetic body for field poles. It is a schematic block diagram which shows the magnet body cleaving apparatus of 1st Embodiment. It is a figure explaining the case where a magnet body is cut using 1st Embodiment. It is a figure explaining the case where a magnet body is cut without using 1st Embodiment. It is a schematic block diagram of the magnet body cleaving apparatus of 2nd Embodiment. It is a figure explaining the case where a magnet body is cut using 2nd Embodiment. It is a schematic block diagram of the magnet cleaving apparatus of 3rd Embodiment. It is a figure explaining the case where a magnet body is cut using 3rd Embodiment. It is a schematic block diagram of the magnet cutting apparatus of 4th Embodiment. It is a schematic block diagram of the magnet cutting apparatus of 5th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  First, a field pole magnet body that is disposed in a rotor core of a rotating electrical machine and to which the present embodiment is applied will be described.

  In FIG. 1, an embedded permanent magnet rotating electric machine A (hereinafter simply referred to as “rotating electric machine”) includes an annular stator 10 constituting a part of a casing (not shown), and a cylinder arranged coaxially with the stator 10. And a rotor 20 having a shape.

  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

  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 centered on the axis O. The slots 22 are formed at equal angular intervals on the same circumference.

  As shown in FIG. 2, the field pole magnet body 80 accommodated in the slot 22 of the rotor 20 has a rectangular magnet body 30 in a plan view in the thickness direction, a direction orthogonal to the longitudinal direction of the magnet body 30, That is, it is configured as an assembly of magnet pieces 31 aligned in a line by adhering a plurality of magnet pieces 31 divided by cutting along a planned cutting surface set in the width direction by resin 32 at the cut sections. The As the 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.

  By the way, when the magnet body is cleaved using the principle of three-point bending, compressive stress is generated on one surface side of the magnet body, the crack of the magnet body is hindered, and the crack of the magnet body is separated from the plane to be cleaved. Abnormal cracks that deviate or become bifurcated may occur, and the accuracy of the fractured surface may deteriorate.

  Therefore, in the present embodiment, a magnet piece manufacturing apparatus and a manufacturing method therefor are provided that constitute a field pole magnet body having a good sectional accuracy with respect to the magnet body 30. FIG. 3 is a schematic configuration diagram showing a magnet body cleaving apparatus 1 which is a manufacturing apparatus for magnet pieces constituting the field pole magnet body of the present embodiment.

  The magnet body cleaving apparatus 1 includes a pair of dies 2, a punch 3, and a chuck jig 4.

  The die 2 extends along the width direction of the magnet body 30 and supports the lower side of the magnet body 30. The pair of dies 2 are orthogonal to the width direction of the magnet body 30 and are arranged in parallel along the direction along the magnet body 30, that is, along the longitudinal direction of the magnet body 30. The magnet body 30 is bridged between the pair of dies 2 and is cleaved by the punch 3.

  The punch 3 extends along the width direction of the magnet body 30 and is driven in the vertical direction by, for example, a servo press, a mechanical press, a hydraulic press, or the like. In the cross section orthogonal to the width direction of the magnet body 30, the punch 3 becomes thicker as it is away from the magnet body 30, that is, as it goes upward. The punch 3 descends from the initial position above the magnet body 30, touches the magnet body 30 between the pair of dies 2, and further descends to press the magnet body 30, so that the punch 3 and the pair of dies 2 The magnet body 30 is cleaved by the principle of three-point bending. The punch 3 rises after breaking the magnet body 30 and returns to the initial position.

  The chuck jig 4 is a jig that pulls the magnet body 30 in the longitudinal direction of the magnet body 30. A pair of chuck jigs 4 are arranged with the punch 3 interposed therebetween. The chuck jig 4 pulls the magnet body 30 in the longitudinal direction of the magnet body 30 with the end 30a side in the longitudinal direction of the magnet body 30 interposed therebetween, and applies stress toward the end 30a in the longitudinal direction of the magnet body 30. .

  The magnet body cleaving apparatus 1 hangs the magnet body 30 between the pair of dies 2, places the punch 3 down, and cleaves the magnet body 30 by three-point bending with the pair of dies 2 and the punch 3. . As shown in FIG. 4A, the magnet body cleaving device 1 applies stress to the magnet body 30 by pulling the magnet body 30 toward the end 30 a in the longitudinal direction of the magnet body 30 by the chuck jig 4. 4B, the punch 3 is lowered from the initial position in this state, and bending stress is applied to the magnet body 30 so that the magnet body 30 is cleaved. That is, the magnet cleaving apparatus 1 pulls the magnet body 30 in the longitudinal direction of the magnet body 30 by the chuck jig 4 and applies the stress from the cleaving portion toward the longitudinal end portion 30a of the magnet body 30 while punching the punch 3. The magnet body 30 is cleaved by.

  The effect of 1st Embodiment of this invention is demonstrated.

  A case where the magnet body 40 is cleaved without using the chuck jig 4 of the present embodiment will be described with reference to FIG.

  The planned cutting surface of the magnet body 40 is a flat surface that extends straight from the tip of the punch 41 toward the magnet body 40, that is, a smooth surface. In FIG. 5, the planned cutting surface of the magnet body 40 is indicated by a broken line.

  When the punch 41 contacts the magnet body 40, tensile stress is generated on the lower surface side of the magnet body 40 with which the pair of dies 42 contact, and compressive stress is generated on the upper surface side of the magnet body 40 with which the punch 41 contacts (FIG. )reference).

  When the punch 41 is further lowered, a crack is generated on the lower surface side of the magnet body 40 and cleaving starts. On the upper surface side of the magnet body 40, the progress of the crack is hindered by the compressive stress (see FIG. 5B).

  When the punch 41 is further lowered in a state where the progress of the crack is hindered by the compressive stress, the progress direction of the crack deviates from the planned cutting surface (see FIG. 5C). The cleaved surface extends straight from the tip of the punch 41 to the magnet body 40, but the cleaved surface in the vicinity of the cleaved surface on the upper surface side of the magnet body 40 is a place where compressive stress is concentrated and deviates from the cleave line when the compressive stress increases. Cracks tend to progress.

  In the present embodiment, as shown in FIG. 4, the magnet body 30 is pulled by the chuck jig 4 in the longitudinal direction of the magnet body 30 to reduce the compressive stress on the upper surface side of the magnet body 30, and the magnet body 30 is moved by the punch 3. Since it cleaves, it can suppress that the progress of a crack deviates from a cleaving plan surface, can cleave the magnet body 30, and can make the cleaved surface of the magnet body 30 smooth. The stress for pulling the magnet body 30 by the chuck jig 4 is preferably 0.01 Mpa to 400 Mpa. Thereby, the relaxation degree of the compressive stress on the upper surface side of the magnet body 30 can be optimized, and the magnet body 30 can be cleaved by progressing cracks along the cleaved planned surface. Further, the bending stress due to the punch 3 can be reduced, and the magnet body 30 can be cleaved using the small magnet body cleaving apparatus 1.

  If the magnet body 30 is pulled in the longitudinal direction of the magnet body 30 by the chuck jig 4 after the cutting of the magnet body 30 by the punch 3 is started, stress is applied in the longitudinal direction of the magnet body 30 while the magnet is bent. The chuck jig 4 makes it difficult to accurately apply stress. Therefore, there is a possibility that the progress of the crack may deviate from the planned cutting surface.

  In this embodiment, by pulling the magnet body 30 in the longitudinal direction of the magnet body 30 by the chuck jig 4 and cleaving the magnet body 30 by the punch 3 in a state where stress is applied, the progress of cracks deviates from the planned cutting surface. This can be suppressed and the fractured surface of the magnet body 30 can be made smooth.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  FIG. 6 is a schematic configuration diagram of the magnet body breaking device 1 according to the second embodiment. The second embodiment is different from the first embodiment in the magnet body breaking device. The magnet cleaving device 50 according to this embodiment includes a pair of dies 2, a punch 3, and a pressing portion 51.

  The pressing portion 51 protrudes from the upper portion of the punch 3 in the longitudinal direction of the magnet body 30, and a protrusion portion 52 that moves integrally with the punch 3, and a contact disposed between the protrusion portion 52 and the magnet body 30. And a spring 54 that connects the protruding portion 52 and the contact portion 53. A pair of pressing portions 51 are arranged with the punch 3 interposed therebetween.

  The contact portion 53 includes a first flat plate portion 55 extending in the vertical direction and a second flat plate portion 56 extending from the upper end of the first flat plate portion 55 toward the punch 3. The lower end surface 55 a of the first flat plate portion 55 contacts the upper surface of the magnet body 30. An end surface 56 a on the punch 3 side of the second flat plate portion 56 contacts the punch 3. An end surface 56 a of the second flat plate portion 56 that comes into contact with the punch 3 is formed along the tooth surface of the punch 3.

  The pair of contact portions 53 are connected to each other by a connecting portion (not shown) at the end in the width direction of the magnet body 30. The connecting portion prevents the pair of contact portions 53 from relatively shifting in the width direction of the magnet body 30, and enables the contact portions 53 to move in the longitudinal direction of the magnet body 30.

  As the distance from the magnet body 30 becomes longer, the punch 3 becomes thicker in the longitudinal direction of the magnet body 30, and the second flat plate portion 56 of the contact portion 53 comes into contact with the punch 3. Therefore, the distance between the contact portions 53 in the longitudinal direction of the magnet body 30 changes according to the vertical movement of the punch 3. As will be described in detail later, when the punch 3 is lowered, each contact portion 53 is pushed in the direction opposite to the longitudinal direction of the magnet body 30, and the distance between the contact portions 53 becomes longer. On the other hand, when the punch 3 is raised, the distance between the contact portions 53 is shortened.

  When the punch 3 is lowered, the distance between the protruding portion 52 and the pressing portion 51 is shortened, and the spring 54 contracts. When the spring 54 contracts, the elastic force of the spring 54 increases, so that the force pressing the contact portion 53 against the magnet body 30 increases. When the punch 3 is lowered and the distance between the contact portions 53 is increased, the end portion 54 a of the spring 54 connected to the contact portion 53 also moves together with the contact portion 53, and the spring 54 connected to the contact portion 53. A restoring force that attempts to return the end 54 a to the original position acts on the contact portion 53. Therefore, when the punch 3 is raised, the contact portion 53 moves so that the distance between the contact portions 53 is shortened by the restoring force of the spring 54.

  The magnet cleaving device 50 lowers the punch 3 from the initial position as shown in FIG. 7A, and the punch 3 causes the abutment portion 53 to move in the longitudinal direction of the magnet 30 as shown in FIG. 7B. The distance between the contact parts 53 is increased by pushing and spreading. When the contact portion 53 moves toward the longitudinal end portion 30a of the magnet body 30, the magnet body 30 is caused by friction between the first flat plate portion 55 of the contact portion 53 and the magnet body 30, as shown in FIG. Is pushed toward the end 30a of the magnet body 30 in the longitudinal direction, and stress is applied. That is, when the punch 3 is lowered, a force that pushes the magnet body 30 in the opposite direction across the punch 3 is generated by the contact portion 53.

  Further, when the punch 3 is lowered, the spring 54 is compressed as shown in FIG. 7B, and the force that presses the contact portion 53 against the magnet body 30 side by the spring 54 increases, and the first flat plate of the contact portion 53. The frictional force on the contact surface between the portion 55 and the magnet body 30 is increased. That is, as the punch 3 descends, the stress applied to the magnet body 30 toward the longitudinal end portion 30a of the magnet body 30 increases.

  The magnet body cleaving device 50 further lowers the punch 3 and cleaves the magnet body 30 with the punch 3. The magnet body cleaving device 50 applies a stress to the magnet body 30 toward the end 30 a in the longitudinal direction of the magnet body 30 by the pressing portion 51, and reduces the compressive stress on the upper surface side of the magnet body 30. Cleave.

  When the punch 3 is raised after the magnet body 30 is cut, the contact portion 53 is pulled toward the punch 3 by the restoring force of the spring 54, and the contact portion 53 returns to the original position. Alternatively, the pair of contact portions 53 may be connected by another elastic member such as a spring, and the contact portions 53 may be biased toward the punch 3 by the elastic member.

  The contact portion 53 may be divided into a plurality of portions in the width direction of the magnet body 30.

  The effect of 2nd Embodiment of this invention is demonstrated.

  By crushing the magnet body 30 with the punch 3 while applying stress to the magnet body 30 toward the longitudinal end 30a of the magnet body 30 by the pressing portion 51, the progress of the crack is prevented from deviating from the planned cutting surface. In addition, the cut section of the magnet body 30 can be smoothed.

  Working steps can be reduced by applying stress to the magnet body 30 toward the end 30a in the longitudinal direction of the magnet body 30 by the pressing portion 51 in conjunction with the lowering of the punch 3. Further, the magnet body breaking device 50 can be reduced in size.

  Next, a third embodiment of the present invention will be described with reference to FIG.

  FIG. 8 is a schematic configuration diagram of a magnet body cleaving apparatus according to the third embodiment. The third embodiment is different from the first embodiment in the magnet cleaving device. The magnet body breaking device 60 according to the present embodiment includes a pair of dies 2, a punch 3, and a pressing portion 61.

  The pressing portion 61 includes a contact portion 62 and a spring 63 that connects the contact portion 62 and the punch 3. A pair of pressing portions 61 are arranged with the punch 3 interposed therebetween.

  An end face 62 b on the punch 3 side of the contact portion 62 is connected to the punch 3 via a spring 63. The spring 63 connects the tooth surface of the punch 3 and the pressing portion 61, and is inclined with respect to the vertical direction in which the punch 3 moves so that the distance from the tooth surface becomes longer toward the magnet body 30 side.

  The pressing portion 61 is provided so as to extend obliquely from the tooth surface of the punch 3 toward the magnet body 30.

  When the punch 3 is lowered from the initial position, the end surface 62a on the magnet body 30 side of the contact portion 62 comes into contact with the magnet body 30 as shown in FIG. When the punch 3 is further lowered, the spring 63 is compressed as shown in FIG. 9B, and the force that presses the contact portion 62 against the magnet body 30 by the elastic force of the spring 63 increases. Since the spring 63 and the contact portion 62 are disposed obliquely with respect to the longitudinal direction of the magnet body 30, the upper surface of the magnet body 30 is made to be the magnet body 30 by friction between the end surface 62 a of the contact portion 62 and the magnet body 30. It is pushed toward the end 30a in the longitudinal direction, and stress is applied. That is, when the punch 3 descends, the pressing portion 61 generates a force that pushes the magnet body 30 in the opposite direction across the punch 3.

  The magnet cleaving device 60 applies stress to the magnet body 30 toward the end 30a in the longitudinal direction of the magnet body 30 by the pressing portion 61, and cleaves the magnet in a state where the compressive stress on the upper surface side of the magnet body 30 is reduced. To do.

  The effect of the third embodiment of the present invention will be described.

  By crushing the magnet body 30 by the punch 3 while applying stress to the magnet body 30 toward the longitudinal end 30a of the magnet body 30 by the pressing portion 61, the progress of the crack is prevented from deviating from the planned cutting surface. In addition, the cut section of the magnet body 30 can be smoothed.

  The working process can be reduced by applying stress to the magnet body 30 toward the end 30a in the longitudinal direction of the magnet body 30 by the pressing portion 61 in conjunction with the lowering of the punch 3. Moreover, the magnet body breaking device 60 can be reduced in size.

  Next, a fourth embodiment of the present invention will be described with reference to FIG.

  FIG. 10 is a schematic configuration diagram of a magnet body breaking apparatus according to the fourth embodiment. The fourth embodiment is different from the first embodiment in the magnet cleaving device 70.

  The magnet body breaking device 70 includes a pair of dies 71 and a punch 3.

  The die 71 is moved in the longitudinal direction of the magnet body 30 by a motor (not shown) or the like. The moving direction of the pair of dies 71 is the reverse direction. When one die 71 moves toward the longitudinal end 30a of the magnet body 30, that is, when the distance from the punch 3 is increased in the longitudinal direction of the magnet body 30, the other die 71 is moved. The die 71 also moves so that the distance from the punch 3 becomes longer in the longitudinal direction of the magnet body 30. The upper surface of the die 71 is in contact with the lower surface of the magnet body 30, and when the die 71 moves so as to increase the distance from the punch 3 in the longitudinal direction of the magnet body 30, the magnet is caused by friction between the die 71 and the magnet body 30. Stress is applied to the magnet body 30 toward the end 30 a in the longitudinal direction of the body 30.

  The magnet body cleaving device 70 cleaves the magnet body 30 in a state where stress is applied toward the end 30 a in the longitudinal direction of the magnet body 30 by the die 71.

  The effect of 4th Embodiment of this invention is demonstrated.

  By cleaving the magnet body 30 with the punch 3 in a state where stress is applied to the magnet body 30 toward the longitudinal end 30a of the magnet body 30 by the die 71, it is possible to prevent the progress of the crack from deviating from the planned cutting surface. In addition, the cut section of the magnet body 30 can be smoothed.

  By applying stress to the magnet body 30 toward the end 30a in the longitudinal direction of the magnet body 30 by the die 71, the magnet body cleaving device 70 can be reduced in size.

  Next, a fifth embodiment of the present invention will be described with reference to FIG.

  FIG. 11 is a schematic configuration diagram of a magnet body breaking device according to a fifth embodiment. 5th Embodiment differs in the die | dye 91 of the magnet body cleaving apparatus 90 compared with 4th Embodiment.

  The die 91 has a substantially cylindrical cross section perpendicular to the width direction of the magnet body 30 and is rotated about an axis extending in the width direction of the magnet body 30 by a motor (not shown). The rotation direction of the pair of dies 91 is opposite. Specifically, when one die 91 rotates so as to move the magnet body 30 away from the punch 3, the other die 91 rotates in the opposite direction to the one die 91, and the magnet body 30 is moved away from the punch 3. Rotate away.

  The magnet body cleaving device 90 cleaves the magnet body 30 in a state where stress is applied to the magnet body 30 toward the end 30 a in the longitudinal direction of the magnet body 30 by the die 91.

  The effect of 5th Embodiment of this invention is demonstrated.

  By cleaving the magnet body 30 with the punch 3 in a state where stress is applied to the magnet body 30 toward the end 30a in the longitudinal direction of the magnet body 30 by the die 91, the progress of the crack is prevented from deviating from the planned cutting surface. In addition, the cut section of the magnet body 30 can be smoothed.

  By applying a stress to the magnet body 30 toward the end 30a in the longitudinal direction of the magnet body 30 with the die 91, the magnet body breaking device 90 can be reduced in size.

  It goes without saying that the present invention is not limited to the above-described embodiments, and includes various modifications and improvements that can be made within the scope of the technical idea.

  The above embodiments may be used in combination. For example, the second embodiment and the fifth embodiment may be combined.

  In order to cleave the magnet body 30 into the plurality of magnet pieces 31, a notch groove that is a fragile part serving as a starting point of cleaving may be formed in advance in a portion of the magnet body 30 to be cleaved. As the notch groove to be provided is deeper from the surface and the sharpness of the tip of the notch groove is sharper, the flatness of the cut section when cleaved as the magnet piece 31 is improved.

  As a method of forming the notch groove, a method of providing in the molding process of 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, a method of laser beam irradiation And wire cut electric discharge machining.

1, 50, 60, 70, 90 Magnet body cleaving device 2 Die 3 Punch (Cleaving means)
4 Chuck jig (loading means)
30 Magnet body 51 Pressing part (loading means)
52 Protruding part 53 Abutting part 54, 63 Spring (elastic part)
61 Pressing part (loading means)
62 Contact part 71 Die (support part)
80 Field pole magnet 91 Die (support)

Claims (9)

Cleaving by a cleaving means at a cleaving plane set perpendicular to the longitudinal direction of the magnet body, and a method of manufacturing a magnet piece constituting a field pole magnet body,
A contact member is provided that contacts both sides of the planned cutting surface on the upper surface side facing the cleaving means of the magnet body,
In conjunction with the lowering of the cleaving means for cleaving the magnet body, the abutting member is pressed against the upper surface of the magnet body and is moved from the planned cleaving surface toward the end in the longitudinal direction. wherein while loading the split direction cow stress in the longitudinal direction of the ends of the cross scheduled surface the magnet body on the upper surface, characterized by cleaving the magnet body by adding bending stress on the magnet by the cleaving means The manufacturing method of the magnet piece which comprises the magnet body for field poles.   2. The magnet piece constituting the field pole magnet body according to claim 1, wherein the stress toward the longitudinal end of the magnet body is applied before the cleaving of the magnet body is started. Manufacturing method. A magnet piece manufacturing apparatus that forms a field pole magnet body by cleaving a magnet body with a cleaving means at a cleaving planned plane set orthogonal to the longitudinal direction,
A contact member that comes into contact with both sides of an upper surface of the magnet body that faces the cleaving means of the magnet body is provided, and the abutting member is moved to the magnet body in conjunction with the lowering of the cleaving means that cleaves the magnet body. from the expected splitting surface causes pressed against the upper surface of the moved toward the end portion in the longitudinal direction, the load countercurrent Cow stress from the expected splitting surface on the upper surface of the magnet body at a longitudinal end of said magnet body Load means to
Configuration wherein a cleaving unit for cleaving the magnet body in a state in which the stress loaded to the magnet body the bending stress applied to the magnet body, the field pole magnet body, characterized in the Turkey provided with the said load means Magnet piece manufacturing equipment.   4. The apparatus for manufacturing a magnet piece constituting a field pole magnet body according to claim 3, wherein the stress applied by the load means is applied before the cleaving of the magnet body is started.   5. The apparatus for manufacturing a magnet piece constituting a field pole magnet body according to claim 3, wherein the load means further pulls the magnet body in the longitudinal direction. The cleaving means becomes thicker in the longitudinal direction as the distance from the magnet body becomes longer,
The load means is
It is arranged between the projecting part projecting in the longitudinal direction from the upper part of the cleaving means, the magnet body and the projecting part, abuts on the magnet body and the cleaving means, and the longitudinal direction according to the operation of the cleaving means a contact member which moves in the direction,
Wherein connecting the abutting member and the protruding portion, it is provided with, and the contact member to press against the said magnet body force increases elastic portion as the distance between the magnet body and the projecting portion is shortened The manufacturing apparatus of the magnet piece which comprises the magnet body for field poles as described in any one of Claim 3 to 5 characterized by these. The load means is
Is disposed between the magnet body and the venting means, the abutting member abutting on the magnet body,
The contact member and connecting the said cleaving means, the distance between the cleaving means as a magnet body side inclined to a moving direction of said fracture means to be longer, the magnet member and the cleaving means field pole magnet of distance according to any one of claims 3 to 5, characterized in that it comprises a said abutment member of the elastic part a force is increased to press into the magnet body as shortened with Manufacturing apparatus of the magnet piece which comprises.   8. The magnet piece constituting the field pole magnet body according to claim 3, wherein the load means includes a support portion that supports the magnet body and moves in the longitudinal direction. 9. Manufacturing equipment.   The field pole according to any one of claims 3 to 7, wherein the load means includes a support portion that supports the magnet body and rotates about an axis in a direction intersecting the longitudinal direction. For manufacturing magnet pieces constituting a magnet body for a vehicle.

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