JP7764754B2 - Magnetic material cutting jig - Google Patents

Description

This invention relates to a jig for cutting magnetic material, and more specifically to a jig for cutting magnetic material characterized by a structure that holds arc-shaped magnetic material in a fixed state.

When manufacturing metal magnets, such as rare earth magnets, the metal magnet is formed into the desired shape by hot processing such as hot extrusion molding. However, when manufacturing relatively small magnets, the magnetic material is formed to a size larger than the intended product, and then this magnetic material is cut to produce multiple magnetic products from a single magnetic material.

An example of a cutting process for such cases is a method in which a rotating, disk-shaped cutting blade is moved relative to the magnetic material fixed to a table or jig to cut the magnetic material (see Patent Document 1 below).

Japanese Patent Application Laid-Open No. 2001-150344 Japanese Patent Application Laid-Open No. 2004-050329

For example, when cutting out multiple arc-shaped magnets of a predetermined length from a magnetic material whose cross-sectional shape is arc-shaped and which extends elongated in a direction perpendicular to the cross-section, it is possible to fix the magnetic material in a circular arrangement around a cylindrical jig using adhesive, and then rotate the jig to which the magnetic material is fixed and a disc-shaped cutting blade together, while moving the cutting blade relatively toward the magnetic material to cut the magnetic material while it is fixed to the jig.
However, if adhesive is used to secure the magnet to the jig, the adhesive increases manufacturing costs and requires the steps of applying the adhesive, heating and hardening the adhesive, and then removing the adhesive, which is a very time-consuming process (melting the adhesive and cleaning the magnet).
Another method for cutting out arc-shaped magnet products is to use wire processing to cut out arc-shaped magnet products from a block-shaped ingot (see Patent Document 2 above), but this makes the overall structure of the processing equipment complex.

The present invention was made in light of the above circumstances, with the objective of providing a jig for cutting magnetic material that can fix magnetic material with an arc-shaped cross section in a circular arrangement along the circumferential direction without using adhesive.

The magnetic material cutting jig of the present invention is as follows:
a material holding portion that is rotatable integrally with the shaft and that holds a plurality of magnetic materials, each having an arc-shaped cross section, in a circular arrangement along the circumferential direction;
a pressing means for pressing the magnetic material against a portion constituting the material holding portion;
The present invention is characterized by the following features.

The magnetic material cutting jig defined in this way makes it possible to fix magnetic material having an arc-shaped cross section in a circular arrangement along the circumferential direction without using adhesive. By attaching it to a cutting device via a shaft, the magnetic material S can be cut while rotating, thereby cutting out arc-shaped magnets of the specified dimensions. Furthermore, the work associated with using adhesive (such as applying adhesive and cleaning to remove it) is no longer necessary, simplifying the work required to cut magnetic material.

In the magnetic material cutting jig of the present invention, the material holding part includes a cylindrical portion, a plurality of leg portions arranged at intervals in the circumferential direction and protruding radially outward from an outer circumferential surface of the cylindrical portion, and opposing pieces that protrude in the circumferential direction at tip ends of the leg portions spaced from the outer circumferential surface and face the magnetic material,
The magnetic material may be configured to include a pressing means that moves the opposing piece or the magnetic material in a radial direction and presses the magnetic material against the outer circumferential surface of the cylindrical portion or the opposing piece.

Here, the magnetic material cutting jig of the present invention is
a circumscribing member including the leg portion and the opposing piece and movable in a radial direction of the columnar portion;
a pair of cylindrical members that abut against one end side and the other end side of the circumscribing member, respectively, to restrict axial movement of the circumscribing member;
an inclined surface formed at a contact portion between the cylindrical member and the circumferential member, the inclined surface inclining at a predetermined inclination angle in a direction approaching the axial center of the cylindrical member as it extends radially outward of the cylindrical member;
As a configuration with
By moving the pair of cylindrical members in a direction in which the axial distance between them becomes smaller, the opposing pieces of the circumscribing member are moved in a diameter-reducing direction, and the magnetic material can be pressed and fixed against the outer peripheral surface of the cylindrical portion.
In this way, a plurality of circumscribing members arranged between a pair of cylindrical members can be simultaneously moved in the diameter reducing direction, and a plurality of magnetic materials at different positions in the circumferential direction can be simultaneously fixed.

Furthermore, a nut member for moving the cylindrical member in the axial direction by a screw feed action can be provided on the opposite side of the cylindrical member from the material holding portion.
In this way, the cylindrical member can be easily moved in the axial direction.

The magnetic material cutting jig of the present invention is
the material holding portion in which circumferential members having the legs and the opposing pieces and spacers are alternately arranged along the axial direction;
an elastic member interposed between the external contact member and the spacer so that a gap is formed between the external contact member and the spacer adjacent to each other when no axial force is applied;
a pair of stopper members arranged on both axial sides of the material holding portion, respectively, to restrict the axial length of the material holding portion;
In a configuration comprising the above, movement of the stopper member in the direction in which the gap becomes smaller causes the elastic member to bulge radially outward, thereby moving the magnetic material in the radially expanding direction, and the magnetic material can be pressed and fixed against the opposing piece.
In this way, multiple elastic members arranged between the pair of stopper members can be caused to bulge radially outward at the same time, and multiple magnetic materials at different positions in the circumferential direction can be fixed at the same time.

Furthermore, a nut member for moving the stopper member in the axial direction by a screw feed action can be provided on the side of the stopper member opposite to the material holding portion.
In this way, the stopper member can be easily moved in the axial direction.

1A is a perspective view of a magnetic material held by a magnetic material cutting jig of the present invention, and FIG. 1B is a perspective view of a circular arc-shaped magnet cut out from the magnetic material of FIG. 1A. FIG. 1 is a perspective view showing a magnet material cutting jig according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing the main elements of the magnet material cutting jig. 1A is a cross-sectional view of the magnet material cutting jig, and FIG. 1B is a cross-sectional view of FIG. 1A taken along the line B-B. 10A to 10C are diagrams showing steps in a cutting method using the magnet material cutting jig. FIG. 2 is a diagram schematically illustrating the state in which the magnet material cutting jig is attached to a cutting device. FIG. 10 is a side view schematically showing a state during cutting processing. FIG. 10 is a perspective view of a magnet material cutting jig according to another embodiment of the present invention. 1A is a side view of the magnet material cutting jig with a part cut away when no axial force is acting on the material holding portion, and FIG. 1B is a cross-sectional view thereof. 10 is a view showing the external contact member, the spacer, and the O-ring of the magnetic material cutting jig separated from each other. FIG. 1A is a side view showing a part of the magnetic material cutting jig holding the magnetic material in a fixed state, and FIG. 1B is a cross-sectional view thereof. 10A to 10C are diagrams showing steps in a cutting method using the magnet material cutting jig.

Next, an embodiment of the present invention will be described in detail with reference to the drawings.
1(A) is a perspective view of a magnetic material held by a magnetic material cutting jig of the present invention. In the figure, S is a magnetic material made of a rare earth-iron-boron alloy, which has been formed into a plate shape by hot working such as hot extrusion.
The magnetic material S has an arc-shaped cross section with a width dimension W and a height dimension H, and has a concave inner curved surface 2 and a convex outer curved surface 4. The magnetic material S extends a length dimension L in a direction perpendicular to the cross section (longitudinal direction) while maintaining its cross-sectional shape. The magnetic material S can be cut at the locations indicated by dotted lines in the figure to obtain a plurality of arc-shaped magnets S1 (two in this example) with a length dimension L1 as shown in FIG. 1(B).

Fig. 2 is a perspective view showing a magnetic material cutting jig 10 according to one embodiment of the present invention. Fig. 2 shows the magnetic material cutting jig (hereinafter, may be simply referred to as the jig) 10 in a state in which the magnetic material S is fixed thereto.
The jig 10 is attached to the cutting device while fixedly holding the magnetic material S. The jig 10 includes shafts 14 and 15 that are engaged with and held by the cutting device, and a material holding portion 11 that holds the magnetic material S. The material holding portion 11 is rotatable integrally with the shafts 14 and 15.

As shown in Figure 3, the material holding unit 11 includes a cylindrical portion 12 and an external contact member 31 that protrudes from the outer peripheral surface 13 of the cylindrical portion 12 and can contact the magnetic material S from the outer surface 4 (see Figure 1 (A)) side of the magnetic material S.

The axial length of the cylindrical portion 12 is longer than the length L of the magnetic material S, and the radius of curvature of the outer peripheral surface 13 of the cylindrical portion 12 is approximately the same as the radius of curvature of the inner curved surface 2 of the magnetic material S. Shafts 14 and 15 extend coaxially from both ends of the cylindrical portion 12, respectively.

3, a plurality of (six in this example) grooves 39 are formed radially at predetermined intervals in the circumferential direction in the columnar portion 12, extending from one end 12a to the other end 12b and opening on the outer circumferential surface 13. A part of a circumscribing member 31 separate from the columnar portion 12 is inserted into the grooves 39, and the circumscribing member 31 is held in a state where it cannot move in the circumferential direction of the columnar portion 12 but can move in the radial direction of the columnar portion 12.
Note that, on the other end 12b side of the outer peripheral surface 13 of the cylindrical portion 12, protruding pieces 18 are formed in the respective regions defined by the grooves 39. The protruding pieces 18 are positioning pieces that come into contact with the end faces of the magnetic material S in the longitudinal direction and define the position of the magnetic material S in the axial direction.

As shown in FIG. 3 , the external contact member 31 includes a leg portion 43 and an opposing piece 45 .
The leg portion 43 is a plate-like member having approximately the same length as the columnar portion 12. The leg portion 43 has two end portions 43 a, 43 a that are short in height when viewed from the side, and a central portion 43 b that is taller than the two end portions 43 a, 43 a. An inclined surface 44 is formed on the upper surface of the portion between the end portion 43 a and the central portion 43 b.

The lower base end portion of the leg portion 43, including both end portions 43a, 43a, is housed in the groove 39. Meanwhile, the tip end of the higher central portion 43b protrudes from the outer peripheral surface 13 of the cylindrical portion 12, and a facing piece 45 is formed on the tip end of the central portion 43b, protruding circumferentially and facing the magnetic material S. The cross-sectional shape of the portion of the external contact member 31 that includes the facing piece 45 is approximately T-shaped.

As shown in Figure 4(A), the circumscribing member 31 is inserted into each of the multiple (six in this example) grooves 39 formed in the cylindrical portion 12, and 12 spaces 40 are formed around the cylindrical portion 12 by the outer peripheral surface 13 and the circumscribing member 31, and the magnetic material S is housed in these spaces 40. More specifically, the magnetic material S is housed so that the concave curved surface 2 of the magnetic material S is aligned with the convex outer peripheral surface 13 of the cylindrical portion 12, and the longitudinal direction of the magnetic material S is the axial direction of the cylindrical portion 12.

As shown in FIGS. 2 and 4B, cylindrical members 34 and 35 and nut members 36 and 37 are provided on one end and the other end of the material holding portion 11, respectively.
The tubular members 34, 35 have a stepped cylindrical shape and include a large diameter portion 48 and a small diameter portion 49. After the shafts 14, 15 are inserted into the tubular members 34, 35, the large diameter portion 48 is attached so as to fit over the ends of the columnar portion 12 and the circumscribing member 31, respectively. An axial end 48a of the large diameter portion 48 abuts against the leg portion 43 of the circumscribing member 31 to restrict axial movement of the circumscribing member 31.

As shown in the enlarged partial view of FIG. 4(B), an inclined surface 44 is formed on the leg 43 side of the large-diameter portion 48 at the contact portion between the end 48a of the large-diameter portion 48 and the leg 43 of the circumscribing member 31, and an inclined surface 50 is formed on the large-diameter portion 48 side. These inclined surfaces 44, 50 are inclined at a predetermined inclination angle θ toward the axial center of the cylindrical portion 12 as they move radially outward from the cylindrical portion 12. These inclined surfaces 44, 50 convert the axial movement force of the cylindrical member 34 (to the right in the partial enlarged view) into a radial movement force of the circumscribing member 31 (downward in the view). In other words, in this example, the inclined surfaces 44, 50 provided at the contact portion of the pair of cylindrical members 34, 35 radially move the circumscribing member 31, including the opposing piece 45, and constitute a pressing means that presses the magnetic material S against the outer peripheral surface 13 of the cylindrical portion 12. In this example, both inclined surfaces 44 and 50 are formed on the contact portion, but in some cases it may be possible to form only inclined surface 44 or only inclined surface 50.

The nut members 36, 37 are provided on the opposite side of the cylindrical members 34, 35 from the material holding portion 11, and are threaded onto the male thread portions 16 formed on the shafts 14, 15. The nut members 36, 37 come into contact with the small diameter portions 49 of the cylindrical members 34, 35, respectively, and are capable of moving the cylindrical members 34, 35 in the axial direction by a screw feed action.
In this example, both tubular members 34 and 35 are movable in the axial direction, but it is also possible to adopt a configuration in which, for example, one of the tubular members 35 is made immovable in the axial direction, and only the tubular member 34 is moved in the axial direction based on the screw feed action of the nut member 36.

Next, a method for cutting the magnetic material S using the magnetic material cutting jig 10 will be described.
First, as shown in FIG. 5(I), with one of the cylindrical members 34 removed, the magnetic material S is accommodated in the space 40 formed by inserting the circumscribing member 31 into the groove 39 of the columnar portion 12, and then the cylindrical member 34 is fitted onto the ends of the columnar portion 12 and the circumscribing member 31.
Next, the nut members 36, 37 (see FIG. 4 ) are tightened, and as shown in FIG. 5 (II), the pair of cylindrical members 34, 35 are moved in a direction in which the axial distance between them decreases (left-right directions indicated by the arrows in the figure). This causes the opposing pieces 45 of the extrinsic member 31 to move in a diameter-reducing direction (downward in the figure), pressing the magnetic material S against the outer circumferential surface 13 of the cylindrical portion 12 and fixing the magnetic material S. Although FIG. 5 (II) shows a state in which one magnetic material S is fixed, the cylindrical members 34, 35 are in contact with all (six) of the extrinsic members 31 attached to the cylindrical portion 12, and all of the extrinsic members 31 move in the diameter-reducing direction simultaneously, fixing all (six) of the magnetic materials S. As a result, the magnetic materials S are held by the material holding part 11 in a circular arrangement along the circumferential direction.

Next, the jig 10 to which the magnetic material S is fixed is attached to the cutting device 20 .
6 is a diagram schematically illustrating the state in which the jig 10 is attached to the cutting device 20 (particularly, the jig 10 is shown in a simplified form). As shown in the figure, the jig 10 is rotatably attached in such a manner that one shaft 14 of the jig 10 is supported by a chuck 21 and the other shaft 15 is supported by a steady rest 22.

As shown in Figure 6, a cutting blade block body 25 is attached in a position opposite the jig 10. Multiple (three in this example) disk-shaped cutting blades 26 are attached to the cutting blade block body 25 coaxially around a rotation axis 28 via spacers 27. The distance between adjacent cutting blades 26, determined by the spacers 27, corresponds to the dimension L1 of the arc-shaped magnet S1 shown in Figure 1 (B).

Then, with the opposing jig 10 and cutting blade block body 25 both rotated, as shown in Fig. 5(III) and Fig. 7(A), the cutting blade block body 25 is moved relatively toward the jig 10, causing the cutting blade 26 to cut from the outer circumferential surface side toward the inside of the magnetic material S. In this example, as shown in Fig. 7(A), the cutting blade 26 is disposed above the jig 10, and the top of the rotating jig 10 is used as the cutting processing point to cut the magnetic material S. The cutting distance at this time is indicated by K3.
7(B), it is also possible to position the cutting blade 26 so that the center of rotation O1 of the cutting blade 26 is on a horizontal line passing through the center of rotation O2 of the jig 10, and to perform cutting by moving the cutting blade 26 horizontally. By doing so, it is possible to make the cutting distance K4 shorter than the cutting distance K3 in FIG. 7(A).

Figure 5 (IV) shows the jig 10 after cutting is complete. After cutting is complete, the arc-shaped magnet S1, cut to the specified dimensions, can be removed from the jig 10 by loosening the nut members 36 and 37.

As described above, the magnetic material cutting jig 10 of this embodiment makes it possible to fix magnetic materials S having arc-shaped cross sections in a circular arrangement along the circumferential direction without using adhesive. By attaching the jig to a cutting device via shafts 14, 15, the magnetic materials S can be cut while rotating, thereby cutting out arc-shaped magnets S1 of predetermined dimensions. Furthermore, the magnetic material cutting jig 10 eliminates the need for work associated with the use of adhesive (such as applying the adhesive and cleaning to remove the adhesive), simplifying the work required to cut the magnetic material.

In the magnetic material cutting jig 10 of this embodiment, the material holding part 11 includes a cylindrical portion 12, legs 43 protruding radially outward from the outer peripheral surface 13 of the cylindrical portion 12, and opposing pieces 45 that protrude circumferentially from the tip ends of the legs 43 and face the magnetic material S. A circumscribing member 31 equipped with the legs 43 and opposing pieces 45 is provided so as to be movable in the radial direction of the cylindrical portion 12. Furthermore, a pair of cylindrical members 34, 35 and inclined surfaces 44, 50 are provided as pressing means for moving the opposing pieces 45 of the circumscribing member 31 in the diameter-reducing direction to press the magnetic material S against the outer peripheral surface 13 of the cylindrical portion 12. This allows multiple circumscribing members 31 arranged between the pair of cylindrical members 34, 35 to simultaneously move in the diameter-reducing direction, thereby simultaneously fixing multiple magnetic materials S at different positions in the circumferential direction.

In addition, the magnetic material cutting jig 10 of this embodiment is provided with nut members 36, 37 on the opposite side of the cylindrical members 34, 35 from the material holding portion 11, which use a screw feed action to move the cylindrical members 34, 35 in the axial direction, making it easy to move the cylindrical members 34, 35 in the axial direction.

Next, a magnetic material cutting jig according to another embodiment of the present invention will be described with reference to Figures 8 to 12. As shown in Figure 9(A), the magnetic material cutting jig 10B has a material holding section 11 that holds the magnetic material S, with multiple external contact members 61 and spacers 71 arranged alternately along the axial direction. These external contact members 61 and spacers 71 are movable in the axial direction of the shaft 58.

10 , the circumscribing member 61 is a ring-shaped member having legs 43 protruding at equal intervals in the circumferential direction from an outer circumferential surface 64 on the radially outer side, and opposing pieces 45 protruding in the circumferential direction and opposing the magnetic material S formed on the tip sides of the legs 43. The magnetic material S is accommodated in a space 65 (see FIG. 9(B) ) defined by the outer circumferential surface 64 of the circumscribing member 61, the legs 43, and the opposing pieces 45.
A through hole 62 is formed in the center of the circumscribing member 61, through which the shaft 58 is inserted. Here, the shaft 58 is a member integrally including the shaft ends 14, 15 and flange 59 shown in Figure 9(A), and is provided with a key 58a at the portion that fits with the circumscribing member 61 and spacer 71. A key groove 62a that can fit with this key 58a is formed in the through hole 62 of the circumscribing member 61, so that the circumscribing members 61 arranged in the axial direction are aligned in the circumferential direction and so that when the shaft 58 rotates, the circumscribing members 61 also rotate integrally.

As shown in FIG. 10, the spacer 71 is also a ring-shaped member, and has a through-hole 72 formed in the center thereof for inserting the shaft 58 therethrough.
Meanwhile, notches 77, 78 are formed in the circumferential direction at the corners where the radially outer outer peripheral surface 64 intersects with the end faces 75, 76. An O-ring 81 serving as an elastic member is fitted in each of the notches 77, 78.

The O-ring 81 is made of rubber or resin and has a circular cross-section. As shown in the enlarged partial view of Figure 9(A), the size (diameter) of the O-ring 81 is specified so that a gap δ is formed between adjacent external contact members 61 and spacers 71 when no axial force is acting on the external contact members 61 and spacers 71 that make up the material holding unit 11.

A pair of stopper members 84, 85 are arranged on both axial sides of the material holding part 11. The stopper members 84, 85 are configured separately from the shaft 58 and are axially movable along the shaft 58. The stopper members 84, 85 come into contact with the end faces of the material holding part 11 to restrict the axial length of the material holding part 11.
In this example, by moving the stopper members 84, 85 in the direction in which the gap δ becomes smaller, the O-ring 81 is compressed in the axial direction, and as a result, as shown in the partial enlarged view of Fig. 11(A), the O-ring 81 is bulged outward in the radial direction, and this makes it possible to move the magnetic material S in the radially expanding direction (upward in the partial enlarged view). That is, in this example, the pair of stopper members 84, 85 and the O-ring 81 arranged in the material holding part 11 constitute a pressing means that moves the magnetic material S in the radial direction and presses the magnetic material S against the opposing piece 45.

The nut member 88 is provided on the opposite side of the stopper member 84 from the material holding portion 11, and threads onto the male thread portion 16 formed on the shaft 58. The nut member 88 has a flange portion 89, and when in contact with the stopper member 84, further screw feed action allows the stopper member 84 to move axially (to the right in the figure). The other stopper member 85 abuts against a flange 59 formed integrally with the shaft 58, restricting its movement in the axial direction (to the right in the figure).

Next, a method for cutting the magnetic material S using the magnetic material cutting jig 10B will be described.
First, as shown in FIG. 12(I), in the magnetic material cutting jig 10B in a state where no axial force is acting on the material holding part 11 and a gap δ is formed, the magnetic material S is accommodated in the space 65 formed in the material holding part 11.

Next, when the nut member 88 is rotated in the tightening direction and the stopper member 84 is moved in the direction that reduces the gap δ (to the right in the figure), as shown in Figure 12 (II), the O-ring 81 is compressed in the axial direction and expands radially outward (see the partially enlarged view in Figure 11 (A)). This causes the magnetic material S to move in the radially expanding direction, and the magnetic material S is pressed against and fixed by the opposing piece 45.

Next, the jig 10B to which the magnetic material S is fixed is attached to the cutting device 20 (see FIG. 6). Then, while both the jig 10B and the cutting blade block 25 are rotated, the cutting blade block 25 is moved relatively toward the jig 10B (magnetic material S), and the cutting blades 26 are caused to cut into the magnetic material S from the outer circumferential surface side toward the inside (see FIG. 12 (III)).
After cutting is complete, the nut member 88 is loosened, and the arc-shaped magnet S1 cut to the specified dimensions can be removed from the jig 10B.

As described above, the magnetic material cutting jig 10B of this embodiment comprises a material holding part 11 in which circumferential members 61 each having a leg portion 43 and an opposing piece 45 and spacers 71 are alternately arranged along the axial direction; an O-ring 81 interposed between the circumferential member 61 and the spacer 71 so as to form a gap δ; and a pair of stopper members 84, 85 arranged on both axial sides of the material holding part 11 to regulate the axial length of the material holding part 11. Moving the stopper member 84 in a direction that reduces the gap δ causes the O-ring 81 to bulge radially outward, thereby moving the magnetic material S in the radially expanding direction and pressing and fixing the magnetic material S against the opposing piece 45. According to the magnetic material cutting jig 10B, multiple O-rings 81 arranged between the pair of stopper members 84, 85 can be simultaneously bulged radially outward, thereby fixing multiple magnetic materials S at different positions around the circumference.

In addition, the magnetic material cutting jig 10B of this embodiment is provided with a nut member 88 on the side of the stopper member 84 opposite the material holding portion 11, which moves the stopper member 84 axially using a screw feed action, making it easy to move the stopper member 84 in the axial direction.

Although the embodiments of the present invention have been described in detail above, these are merely examples. For example, the size of the cylindrical portion and the shape of the opposing piece in the magnetic material cutting jig of the present invention can be changed as appropriate to match the size and shape of the magnetic material to be held. Furthermore, the pressing means that presses the magnetic material against the portion that constitutes the material holding portion can also be configured in a different way from the above-described embodiments as appropriate. Furthermore, the magnetic material cutting jig of the present invention can also be applied to cutting magnetic material made of metal magnets other than rare earth magnets, and the present invention can be configured in a variety of modified forms within the scope of its spirit.

2 Inner curved surface 10, 10B Magnet material cutting jig 11 Material holding portion 12 Cylindrical portion 13 Outer circumferential surface 14, 15, 58 Shaft 31, 61 External contact member 34, 35 Cylindrical member 36, 37, 88 Nut member 43 Leg portion 44, 50 Inclined surface 45 Opposing piece 71 Spacer 81 O-ring (elastic member)
84, 85 Stopper member S Magnetic material

Claims (5)

a material holding portion that is rotatable integrally with the shaft and that holds a plurality of magnetic materials, each having an arc-shaped cross section, in a circular arrangement along the circumferential direction;
a pressing means for pressing the magnetic material against a portion constituting the material holding portion;
A magnet material cutting jig comprising:
the material holding part including: a columnar part; a plurality of leg parts arranged at intervals in the circumferential direction and protruding radially outward from an outer circumferential surface of the columnar part; and opposing pieces protruding in the circumferential direction at tip ends of the legs spaced from the outer circumferential surface and facing the magnetic material;
the pressing means for moving the opposing piece or the magnetic material in a radial direction and pressing the magnetic material against the outer circumferential surface of the cylindrical portion or the opposing piece;
A magnetic material cutting jig equipped with the above . a circumscribing member including the leg portion and the opposing piece and movable in a radial direction of the columnar portion;
a pair of cylindrical members that abut against one end side and the other end side of the circumscribing member, respectively, to restrict axial movement of the circumscribing member;
an inclined surface formed at a contact portion between the cylindrical member and the circumferential member, the inclined surface inclining at a predetermined inclination angle in a direction approaching the axial center of the cylindrical member as it extends radially outward of the cylindrical member;
Equipped with
2. The magnetic material cutting jig according to claim 1, wherein the opposing pieces of the circumferential member are moved in a diameter-reducing direction by movement of the pair of cylindrical members in a direction in which the axial inter-distance distance between the pair of cylindrical members becomes smaller, and the magnetic material is pressed and fixed against an outer peripheral surface of the columnar portion. 3. The jig for cutting a magnetic material according to claim 2 , further comprising a nut member provided on the opposite side of the cylindrical member from the material holding portion, the nut member axially moving the cylindrical member by a screw feed action. the material holding portion in which circumferential members having the legs and the opposing pieces and spacers are alternately arranged along the axial direction;
an elastic member interposed between the external contact member and the spacer so that a gap is formed between the external contact member and the spacer adjacent to each other when no axial force is applied;
a pair of stopper members arranged on both axial sides of the material holding portion, respectively, to restrict the axial length of the material holding portion;
Equipped with
2. The magnetic material cutting jig according to claim 1, wherein the elastic member is caused to bulge radially outward by movement of the stopper member in a direction in which the gap becomes smaller, thereby moving the magnetic material in a radially expanding direction and pressing and fixing the magnetic material against the opposing piece . 5. The jig for cutting a magnetic material according to claim 4 , further comprising a nut member provided on the opposite side of said stopper member from said material holding portion, said nut member moving said stopper member in the axial direction by a screw feed action.