JP2012245571A - Device and method for dividing permanent magnet base material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To divide a permanent magnet base material by a small loading.SOLUTION: A device 1 for dividing a permanent magnet base material is configured to fix the permanent magnet base material 40 by a movable retainer 2 and a static retainer 3, rotate the movable retainer 2 about a movable part rotation axis 22, and divide the permanent magnet base material 40 to form division surfaces. The movable part rotation axis 22 is offset in a direction perpendicular to the division surfaces so as to be positioned on a side of the static retainer 3. Thus, the permanent magnet base material is divided by a small loading.

Description

  In the present invention, the permanent magnet base material is fixed by the movable side holding part and the fixed side holding part, and the permanent magnet base material is cleaved by rotating the movable side holding part around the rotation axis of the movable part. The present invention relates to a permanent magnet base material cleaving apparatus to be molded and a permanent magnet base material cleaving method using the permanent magnet base material cleaving apparatus.

  Conventionally, a permanent magnet cleaving apparatus 100 for a permanent magnet base material shown in FIG. 9 has been used as this type of technology. A permanent magnet cleaving apparatus 100 shown in FIG. 9 is an apparatus for cleaving a permanent magnet base material. The permanent magnet cleaving device 100 includes a movable side holding part 101 and a fixed side holding part 102. A permanent magnet base material holding part 103 is formed in the movable side holding part 101 and the fixed side holding part 102, and the permanent magnet base material 200 as a sintered member is fixed to the permanent magnet base material holding part 103. Is retained. The movable side holding part 101 is rotatable in the direction of arrow Y about the movable part rotation shaft 104. Thereby, with respect to the permanent magnet base material 200, a tensile force is generated in the arrow Z direction, and the permanent magnet base material 200 held by the movable side holding portion 101 can be cleaved.

  For example, Patent Document 1 describes the conventional cleaving method described above.

JP 2006-137170 A

However, the prior art has the following problems. That is, when the material having a high tensile strength is used as the permanent magnet base material 200, a large force is required if the material is to be cleaved only by the tensile force in the arrow Z direction. When the tensile force in the direction of arrow Z increases, the permanent magnet base material 200 slips and breaks at other than the target position, the crack shape deteriorates, and the permanent magnet base material is damaged due to slipping. Since the quality of the permanent magnet after cleaving of the magnet base material 200 is deteriorated, it becomes a problem.
It is also conceivable to increase the magnet holding force X applied from above in FIG. 9 in order to hold and fix the permanent magnet base material 200 so as not to slip. However, if the magnet holding force X for holding and fixing is increased, the permanent magnet base material 200 is crushed by the magnet holding force X, so that the magnet holding force X cannot be increased, which is a problem.

  Therefore, the present invention has been made to solve the above-described problems, and the purpose thereof is to cleave the permanent magnet base material with a small load by applying a bending force in addition to a tensile force to the permanent magnet base material. An object of the present invention is to provide a permanent magnet base material cleaving apparatus and a permanent magnet base material cleaving method.

In order to achieve the above object, a permanent magnet base material cleaving apparatus and a permanent magnet base material cleaving method in one embodiment of the present invention have the following configurations.
(1) A permanent magnet base material is fixed by a movable side holding part and a fixed side holding part, and the permanent magnet base material is cleaved by forming the split section by rotating the movable side holding part about a movable part rotation axis. In the permanent magnet base material cleaving apparatus, the movable part rotating shaft is offset in a direction perpendicular to the split surface and is positioned on the fixed side holding part side.

(2) A permanent magnet substrate cleaving method using the permanent magnet substrate cleaving device described in (1), wherein the movable part rotating shaft is offset in a direction perpendicular to the split section, and the fixed side holding part side It is characterized by being located in.

The operation and effect of the permanent magnet substrate cleaving device will be described.
(1) A permanent magnet base material is fixed by a movable side holding part and a fixed side holding part, and the permanent magnet base material is cleaved by rotating the movable side holding part about the movable part rotation axis to form a cut section. In the magnet base material cleaving apparatus, the permanent magnet base material can be cleaved with a small load by offsetting the rotation axis of the movable part in the direction perpendicular to the fractured surface and positioning it on the fixed side holding part side.
The reason is that the tensile force and the bending force in the direction indicated by arrow F in FIG. This is because the resultant force is generated. The resultant force of the tensile force and the bending force indicated by the arrow F shown in FIG. 1 is close to the arrow Y that is the moving part moving direction as compared with the tensile force indicated by the arrow Z according to the prior art shown in FIG. Occurs in a downward diagonal direction. That is, it is possible to cleave with a small load by applying a bending force indicated by an arrow Fb in the bending direction to the surface to be cleaved in addition to a tensile force indicated by an arrow Ft. Moreover, by being able to be cleaved with a small load, it is possible to prevent degradation of cleaving quality due to deviation at the time of holding and fixing, and to prevent the permanent magnet base material from being collapsed due to an increase in magnet holding force aimed at preventing deviation. .

(2) A permanent magnet substrate cleaving method using the permanent magnet substrate cleaving apparatus, wherein the movable part rotating shaft is offset in a direction perpendicular to the split section, and is positioned on the fixed side holding part side, The permanent magnet substrate can be cleaved with a small load.
The reason is that the tensile force and the bending force in the direction indicated by arrow F in FIG. This is because the resultant force is generated. The resultant force of the tensile force and the bending force indicated by the arrow F shown in FIG. 1 is close to the arrow Y that is the moving part moving direction as compared with the tensile force indicated by the arrow Z according to the prior art shown in FIG. Occurs in a downward diagonal direction. That is, it is possible to cleave with a small load by applying a bending force indicated by an arrow Fb in the bending direction to the surface to be cleaved in addition to a tensile force indicated by an arrow Ft. Moreover, by being able to be cleaved with a small load, it is possible to prevent degradation of cleaving quality due to deviation at the time of holding and fixing, and to prevent the permanent magnet base material from being collapsed due to an increase in magnet holding force aimed at preventing deviation. .
In addition, the offset amount for offsetting the moving part rotation axis in the direction perpendicular to the fractured section has a necessary surface pressure that does not cause the permanent magnet base material to slip, and does not exceed the magnet crushing strength. It is possible to solve the problem of cracking at a position other than the position where the slid is aimed and the problem of crushing the permanent magnet due to the large magnet holding force.

1 is a conceptual cross-sectional view of a cleaving device for a permanent magnet substrate according to a first embodiment of the present invention. It is sectional drawing of the cleaving apparatus of the permanent magnet base material which concerns on the present Example 1 of this invention. It is a stress distribution map of tensile force concerning this example 1 of the present invention. It is a stress distribution map of the bending force which concerns on the present Example 1 of this invention. It is a stress distribution map of the resultant force of the tensile force and the bending force according to the first embodiment of the present invention. It is the figure which showed the relationship between the offset amount which concerns on the present Example 1 of this invention, and the magnet action force required for cleaving. It is the figure which showed the relationship between the offset amount which concerns on the present Example 1 of this invention, and the required surface pressure which does not slip by a holding | maintenance part. It is a conceptual diagram of the permanent magnet base material cleaving apparatus which concerns on the present Example 2 of this invention. It is a conceptual diagram of the cleaving apparatus of the permanent magnet base material which concerns on a prior art.

  Next, an embodiment of a permanent magnet base material cleaving apparatus and a permanent magnet base material cleaving method according to the present invention will be described with reference to the drawings.

(First embodiment)
<Overall configuration of cleaving device>
In FIG. 1, the conceptual sectional drawing of the permanent-magnet-base material cutting apparatus 1 is shown. FIG. 2 is a cross-sectional view of the permanent magnet base material cleaving apparatus 1.
In FIG.1 and FIG.2, it is abbreviate | omitting about parts other than the part which cleaves the permanent magnet base material 40 which is an essential part of this invention, such as a drive means. In this embodiment, the driving means and the like are omitted, but the driving means and the like have the same configuration and operational effects as the conventional technology.

The permanent magnet base material 40 shown in FIG. 1 becomes a permanent magnet 41 having a fractured surface 41A by being cleaved by a cleaved planned surface 40A. In the present embodiment, the permanent magnet base material 40 has a thickness of about 3 mm, a width of 28 mm, and the two permanent magnets 41 having a width of 14 mm are formed by cleaving.
Of the planned cutting surface 40A, the outer peripheral side of the permanent magnet base material 40 (the side fixed by the fixing screw 11) has a notch 401A so that it can be cut from the planned cutting surface 40A when stress is applied to the permanent magnet base material 40. Is formed. The notch 401A is preliminarily formed by laser machining or the like on the permanent magnet base material 40 (the notch 401A is a small recess and does not appear in FIG. 1).
In the present embodiment, what is described as a permanent magnet is a permanent magnet that is given a strong magnetic field after being inserted into the rotor. In this embodiment, it is not inserted into the rotor and a strong magnetic field is not applied, but it is described as a permanent magnet.

  As shown in FIG. 2, the permanent magnet base material cleaving device 1 is a device for cleaving the permanent magnet base material 40 and forming it into a cleaved permanent magnet 41. The permanent magnet base material cleaving device 1 includes a movable side holding part 2, a fixed side holding part 3, and the like.

  The fixed side holding part 3 is for holding and fixing the permanent magnet base material 40. The fixed side holding part 3 is fixed to a fixed part 6 that is fixed. The fixed-side holding part 3 can fix the permanent magnet base material 40 by being fixed to the fixing part 6. A cleaving force application rod 5 for applying a cleaving force to the movable side holding unit 2 is formed in the fixed side holding unit 3.

  The movable-side holding part 2 is configured to first hold and fix the permanent magnet base material 40 and secondly move the permanent magnet base material 40 to break the permanent magnet base material 40. The movable side holding part 2 is formed with a movable rotating part 21 and rotates around the movable part rotating shaft 22 of the movable rotating part 21. The movable rotating part 21 is formed so as to protrude from the lower surface 2 </ b> A of the movable side holding part 2. The movable part rotating shaft 22 of the movable rotating part 21 is offset in a direction perpendicular to the planned cutting surface 40A (same as the cut section 41A, the same in the specification) that is to be the cut section of the permanent magnet base 40, and It is located on the fixed holding part 3 side.

  The offset amount of the movable rotating portion 21 in the present embodiment is determined by a range in which the permanent magnet base material 40 has a necessary surface pressure that does not slip and does not exceed the magnet crushing strength. In this embodiment, it determines with the range which has required surface pressure which does not slip with the holding | maintenance part shown in FIG. 7, and does not exceed magnet crushing strength. The crushing surface pressure T shown in FIG. 7 is a value that may cause crushing in the permanent magnet base material when the surface pressure T is exceeded in order to hold and fix the permanent magnet base material and exceed the crushing surface pressure T. . In this embodiment, the crushing surface pressure T is about 940 MPa, and even if a surface pressure of about 940 MPa is applied to the permanent magnet base material 40, the crushing surface pressure T is a value that does not cause crushing. In this embodiment, the crushing surface pressure T is about 940 MPa, but the crushing surface pressure T varies greatly depending on conditions such as the compression strength when compressing the magnet material and the magnet material. However, the crushing surface pressure is a value that does not crush when a surface pressure is applied to hold and fix the permanent magnet base material.

The solid line S shown in FIG. 7 shows the relationship between the surface pressure that does not slip at the holding portion and the offset amount. In the present embodiment, the offset amount is set to about 940 MPa or less having a necessary surface pressure that is within the range of the crushing surface pressure T indicating the magnet crushing strength and does not slip at the holding portion. In the solid line S, the crushing surface pressure T is about 940 MPa or less, which is an offset amount of S1 or more. That is, in this embodiment, by setting the offset amount to 3 mm or more, the permanent magnet base material 40 can have a necessary surface pressure that does not slip and can be within a range that does not exceed the magnet crushing strength.
In the present embodiment, the offset amount is set to 3 mm or more, but the offset amount is changed depending on the thickness of the permanent magnet base material 40 and the size of the permanent magnet base material cleaving apparatus 1. Therefore, the amount of offset is determined by the range in which the permanent magnet base material that is not affected by the thickness of the permanent magnet base material and the size of the cleaving device has a necessary surface pressure that does not slip and does not exceed the magnet crushing strength. It is preferable to do.

As shown in FIG. 2, the fixed side holding part 3 and the movable side holding part 2 are formed with a magnet fixing part 10 for fixing the permanent magnet base material 40. The magnet fixing part 10 is divided by moving the movable side holding part 2. Of the fixed side holding part 3 and the movable side holding part 2, fixing screws 11 </ b> A and 11 </ b> B are formed to press the permanent magnet base material 40 disposed in the magnet fixing part 10 from above. The fixing screw 11 </ b> A is formed in the movable side holding portion 2, and the fixing screw 11 </ b> B is fixed to the fixed side holding portion 3. Therefore, when the magnet fixing part 10 is divided, the fixing screws 11A and 12B exist in the movable side holding part 2 and the fixed side holding part 3, respectively.
Although the fixing screw 11 is used in the present embodiment, other screws can be applied as long as they can be fixed.

<Operational effect of cleaving device>
First, the permanent magnet base material 40 is disposed on the magnet fixing portion 10. Subsequently, the permanent magnet base material 40 is held and fixed using the fixing screw 11. In the present embodiment, the magnet holding force W shown in FIG. 1 is generated with respect to the permanent magnet base material 40 by rotating the fixing screw 11, so that the magnet fixing portion 10 can be fixed.

  Second, the movable side holding part 2 moves in the direction of arrow Y (movable part moving direction) in the figure around the movable part rotating shaft 22. As the movable side holding part 2 moves in the arrow Y direction, the permanent magnet base 40 is cleaved from the cleaved planned surface 40A, and the permanent magnet 41 having the cleaved section 41A is formed. Of the planned cutting surface 40A, the first portion to be cut is a notch 401A formed on the outer periphery of the permanent magnet base 40. In the present embodiment, by using the permanent magnet base material cleaving apparatus 1, the permanent magnet base material 40 can be cleaved with a small load.

FIG. 6 shows a relationship between the magnet acting force (KN) and the offset amount (mm) necessary for cleaving. Here, the magnet acting force refers to a force required to cleave the permanent magnet base material (the same applies in the specification). The solid line R shows the relationship between the magnet acting force (KN) and the offset amount (mm) necessary for cleaving. For example, in R0 when the movable part rotating shaft 104 is not offset like the permanent magnet cleaving apparatus 100 shown in FIG. 9 according to the prior art, about 8 KN of the magnet acting force necessary for cleaving is required. On the other hand, in R3 when the movable part rotating shaft 22 is offset by 3 mm as in this embodiment, the magnet acting force necessary for cleaving is about 7.5 KN. Further, in R5 when the movable portion rotating shaft 22 is offset by 5 mm, the magnet acting force necessary for cleaving is about 7 KN. Further, in R8 when the movable portion rotating shaft 22 is offset by 8 mm, the magnet acting force necessary for cleaving is about 6.5 KN. As described above, since the magnet acting force necessary for cleaving the permanent magnet base material 40 is reduced by offsetting the movable portion rotating shaft 22, the permanent magnet base material 40 can be cleaved with a small load.
In this embodiment, the magnet acting force necessary for cleaving is about 8 KN (R0) to about 6.5 KN (R8), but the magnet acting force necessary for cleaving is the thickness of the permanent magnet base material 40 or the like. It is changed by. However, there is no change in the fact that the magnet acting force required for cleaving is reduced by offsetting.

  The reason why the permanent magnet base material 40 can be cleaved with a small load is that the movable part rotating shaft 22 is offset in a direction perpendicular to the cleaving face 40A and positioned on the fixed holding part 3 side, thereby cleaving the cleaving face 40A. This is because a resultant force of a tensile force and a bending force is generated in the direction indicated by the arrow F. The resultant force of the tensile force and the bending force indicated by the arrow F in FIG. 1 is closer to the arrow Y that is the moving part moving direction as compared with the tensile force indicated by the arrow Z according to the prior art shown in FIG. Occurs in an obliquely downward direction. On the other hand, the tensile force indicated by the arrow Z shown in FIG. That is, in the resultant force of the tensile force and the bending force indicated by the arrow F shown in FIG. 1, the movable portion rotating shaft 22 is offset in the direction perpendicular to the planned cutting surface 40 </ b> A and positioned on the fixed side holding portion 3 side. Since a force in the bending direction is applied to the surface 40A, a force is generated in the direction of the arrow F. When the permanent magnet base material 40 is cleaved, it can be cleaved by a smaller load when it is cleaved by a resultant force obtained by adding a bending force to the tensile force than cleaving by a tensile force. Therefore, the permanent magnet base material 40 can be cleaved with a small load by using the permanent magnet base material cleaving apparatus 1 of the present embodiment.

<Description of resultant force of tensile force and bending force>
Specifically, when the movable side holding part 2 moves, the resultant force of the tensile force and the bending force indicated by arrows Fa11 to Fa18 in FIG. Can be cleaved by load. The magnet action force resulting from the combined force of the tensile force and the bending force will be described in detail later.
FIG. 3 shows a stress distribution diagram of the tensile force in the present embodiment. FIG. 4 shows a stress distribution diagram of the bending force in the present embodiment. FIG. 5 shows a stress distribution diagram of the resultant force of the tensile force and the bending force applied with the tensile force and the bending force in the present embodiment.

As shown in FIG. 3, the stresses Ft11 to Ft18, which are tensile forces indicated by the arrows Ft, are uniformly generated from the planned cutting surface 40A in the cutting vertical direction.
Further, as shown in FIG. 4, the bending force indicated by the arrow Fb generates stresses Fb11 to Fb13 in the cleaved vertical direction from the cleaved planned surface 40A. The stress Fb11 is the largest, and the stresses Fb12 and Fb13 are reduced. That is, the stress increases as the stress Fb1 moves away from the cleaving center point 40AP (the center of the cross section of the cleaved planned surface 40A) and away from the movable portion rotating shaft 22 (outer periphery of the permanent magnet base material 40). Further, the bending force indicated by the arrow Fb generates stresses Fb21 to Fb23 in the opposite cleaved vertical direction from the cleaved planned surface 40A. The stress Fb21 is the largest, and the stresses Fb22 and Fb13 are small. That is, the stress Fb <b> 2 increases as it goes away from the cleaving center point 40 </ b> AP (the center of the cross section of the cleaving planned surface 40 </ b> A) and away from the movable portion rotating shaft 22 (outer periphery of the permanent magnet base material 40).

  As shown in FIG. 5, when the stress Ft1 shown in FIG. 3 and the stresses Fb1 and Fb2 shown in FIG. 4 are applied, a stress distribution diagram of the resultant force of the tensile force and the bending force indicated by arrows Fa11 to Fa18 is obtained. That is, the stress increases as it goes from the portion near the movable portion rotating shaft 22 to the portion farthest from the movable portion rotating shaft 22 in the cleaving planned surface 40A. The reason is that the stresses Ft11 to Ft18, which are the tensile forces indicated by the arrows Ft in FIG. 3, are generated evenly in the vertical direction of the cutting from the planned cutting surface 40A, whereas the stresses Ft11 to Ft18 are the bending forces indicated by the arrows Fb. The stresses Fb11 to Fb13 and the stresses Fb21 to Fb23 are smaller as they are closer to the cleaving center point 40AP of the permanent magnet base 40, and are larger as they are closer to the outer periphery of the permanent magnet base 40. Therefore, in the resultant force of the tensile force and the bending force indicated by the arrow Fa shown in FIG. Become. On the other hand, stresses Fb21 to Fb23 are applied to the stresses Ft16 to Ft18 at a portion close to the movable portion rotating shaft 22 from the cleaving center point 40AP, and the stress is reduced. As a result, the stress Fa of the combined force of the tensile force and the bending force to which the stresses Ft1 to Ft18 of the tensile force and the stresses Fb11 to Fb13 and Fb21 to Fb23 of the bending force are applied is as shown in FIG. The stress increases as it goes from the stress Fa18 in the portion near the movable portion rotating shaft 22 to the stress Fa11 in the portion farthest from the movable portion rotating shaft 22.

  A notch 401A is formed on the upper part of the planned cutting surface 40A, and the cleaving starts from the notch 401A. Therefore, if the stress Fa is concentrated on the outer peripheral portion of the permanent magnet base material 40 far from the movable portion rotating shaft 22 where the notch 401A is formed and a large force is applied, the permanent magnet base material 40 can be cleaved with a small load as a whole. it can. In the present embodiment, as shown in FIG. 6, the outer load of the permanent magnet base material 40 is far from the movable part rotating shaft 22 where the notch 401A is formed, although the load is small compared to the case where the conventional offset is not applied. On the other hand, as shown in FIG. 5, a resultant force of a large tensile force and a bending force is applied. Therefore, the permanent magnet 40 can be cleaved and formed into the permanent magnet 41 with a load smaller than that of the prior art.

  In addition, since it can be cleaved with a small load, it is possible to prevent deterioration of division quality due to deviation at the time of holding and fixing. For example, when the permanent magnet base material is to be cleaved by a tensile force acting in the horizontal direction, the permanent magnet base material is torn, so that it is difficult to cleave at the intended cleaving plane. On the other hand, when the permanent magnet base material is cleaved by the bending force acting in the vertical direction, the load is applied in the downward direction, so that it is easy to cleave at the planned cleaving surface. Therefore, it is possible to prevent the permanent magnet base material from deteriorating the misalignment cutting quality during holding and fixing.

  Further, since the permanent magnet base material can be cleaved with a small load, the magnet holding force X for holding and fixing the permanent magnet base material can be reduced. Therefore, it is possible to prevent the permanent magnet base material from being crushed due to the increase in the magnet holding force X.

As described above, according to the permanent magnet base material cleaving apparatus and the cleaving method as in the first embodiment, the following operational effects are obtained.
The permanent magnet base material 40 is fixed by the movable side holding part 2 and the fixed side holding part 3, and the permanent magnet base material 40 is cleaved by rotating the movable side holding part 2 about the movable part rotating shaft 22, so that the section 41 </ b> A is cut. In the permanent magnet base material cleaving apparatus 1 for molding the permanent magnet base material 40 with a small load, the movable part rotating shaft 22 is offset in the direction perpendicular to the planned cutting surface 40A and positioned on the fixed side holding part 3 side. Can be cleaved.
The reason for this is that the movable portion rotating shaft 22 is offset in the direction perpendicular to the cleaving planned surface 40A and positioned on the fixed side holding unit 3 side, whereby the tensile force indicated by the arrow F in FIG. This is because the resultant bending force is generated. The resultant force of the tensile force and the bending force indicated by the arrow F in FIG. 1 is closer to the arrow Y that is the moving part moving direction as compared with the tensile force indicated by the arrow Z according to the prior art shown in FIG. Occurs in a downward diagonal direction. That is, when the bending force shown by the arrow Fb in the bending direction is applied to the planned cutting surface 40A in addition to the tensile force shown by the arrow Ft, it can be cut by a small load. Further, since the permanent magnet base material 40 can be cleaved with a small load, the permanent magnet base material 40 caused by an increase in the magnet holding force X aiming at prevention of deviation and prevention of deviation due to deviation at the time of holding and fixing. Can be prevented.

  The offset amount for offsetting the movable part rotating shaft 22 in the direction perpendicular to the cleaving scheduled surface 40A has a necessary surface pressure that the permanent magnet base material 40 does not slip and does not exceed the magnet crushing strength, The problem that the permanent magnet base material 40 is cracked at a position other than the position at which the permanent magnet base material 40 is slid and the problem that the permanent magnet base material 40 is crushed due to the large magnet holding force can be solved. Specifically, since the permanent magnet base material 40 does not slip, the surface of the permanent magnet base material 40 can be prevented from being damaged and the quality can be maintained. Moreover, the permanent magnet base material 40 can be prevented from being crushed by setting it within a range that does not exceed the magnet crushing strength.

(Second Embodiment)
Compared with the permanent magnet base material cleaving apparatus 1 according to the first embodiment, the magnet base material cleaving apparatus 70 according to the second embodiment has no difference except that a tensile force applying device 71 is formed. Therefore, in 2nd Embodiment, other description is omitted by demonstrating in detail the tension | tensile_strength provision apparatus 71 among the magnet base material cleaving apparatuses 70. FIG.
In addition, although description is abbreviate | omitted about the structure other than the tension | tensile_strength provision apparatus 71 in 2nd Embodiment, and an effect, the other part has the structure and effect similar to 1st Embodiment.

FIG. 8 is a conceptual cross-sectional view of a magnet base cleaving device 70 according to the second embodiment.
The magnet base cleaving device 70 is formed with a tensile force applying device 71 for applying a tensile force to the movable side holding portion 2. The tensile force applying device 71 can apply a tensile force indicated by an arrow Fk5 to the movable side holding portion 2 by the urging member 73.
In addition, a guide 29 is formed on the movable rotating portion 21, and the movable side holding portion 2 is attached to the guide 29 in a slidable configuration. Therefore, only the movable side holding part 2 can receive the tensile force in the direction of the arrow Fk5. The movable side holding part 2 can receive the rotational force in the rotational direction by the movable rotating part 21 in a state of receiving the tensile force.

When the movable part rotating shaft 22 is largely offset in the first embodiment, the bending force applied to the magnet may be too large. If the bending force becomes too large, there is a possibility that the magnet may be partially broken at the portion where the stress of the bending force is concentrated.
Further, when the bending force increases, it is necessary to increase the magnet holding force for holding the permanent magnet base material, and the permanent magnet base material is crushed by the increase, and therefore the magnet holding force X cannot be increased. It becomes a problem.

  In the present embodiment, the magnet substrate cleaving device 70 has a tensile force applying device 71. Therefore, a tensile force indicated by an arrow Fk5 can be applied to the movable side holding portion 2 as compared with the first embodiment. Therefore, the tensile force indicated by the arrow Fk5 can be similarly applied to the permanent magnet base material 200 fixed to the movable side holding portion 2. Therefore, the bending force can be canceled by applying the tensile force indicated by the arrows Fk5 and Ft5, and the resultant force of the tensile force and the bending force indicated by the arrow F5 can be generated. The resultant force of the tensile force and the bending force indicated by the arrow F5 in the present embodiment is a force that can cleave the permanent magnet base without increasing the magnet holding force without partially destroying the magnet. Become.

Note that the present invention is not limited to the above-described embodiment, and various applications are possible without departing from the spirit of the invention.
For example, in the present embodiment, the offset amount is 3 mm or more, but the offset amount is changed depending on the thickness of the permanent magnet base material 40 and the size of the permanent magnet base material cleaving apparatus 1. Therefore, the amount of offset is determined by the range in which the permanent magnet base material that is not affected by the thickness of the permanent magnet base material and the size of the cleaving device has a necessary surface pressure that does not slip and does not exceed the magnet crushing strength. It is preferable to do.

  For example, in this embodiment, the magnet acting force necessary for cleaving is about 8 KN (R0) to about 6.5 KN (R8), but the magnet acting force necessary for cleaving is the thickness of the permanent magnet base material 40 or the like. It is changed by. However, there is no change in the fact that the magnet acting force required for cleaving is reduced by offsetting.

DESCRIPTION OF SYMBOLS 1 Permanent magnet base material cutting apparatus 2 Movable side holding | maintenance part 22 Movable part rotating shaft 3 Fixed side holding | maintenance part 40 Permanent magnet base material 40A Splitting plan surface 41A

Claims (2)

A permanent magnet for fixing a permanent magnet base material by a movable side holding portion and a fixed side holding portion, and cleaving the permanent magnet base material by rotating the movable side holding portion around a rotation axis of the movable portion to form a cut section In the substrate cleaving device,
Offsetting the movable part rotation axis in a direction perpendicular to the split cross section, and positioning it on the fixed side holding part side;
A permanent magnet substrate cleaving device characterized by the above. A permanent magnet substrate cleaving method using the permanent magnet substrate cleaving apparatus according to claim 1,
Offsetting the movable part rotation axis in a direction perpendicular to the split cross section, and positioning it on the fixed side holding part side;
A permanent magnet substrate cleaving method characterized by

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