TWI729253B - Manufacturing method of magnetic core - Google Patents

Abstract

Designed to be able to efficiently manufacture the desired magnetic core. The present invention includes: a holding process to hold a plate-shaped magnetic body (1) by a holding table (13); and a groove forming process to make the first cutter (32) cut into the holding table (13) at a predetermined cutting depth The retained magnetic body (1) is cut and fed in the cutting and feeding direction to form the cutting groove (2); and the groove shaping process makes it harder than the first cutter (32) and uses the first cutter (32) The second cutting blade (34) formed by the above-mentioned width cuts into the cutting groove (2) and is cut and fed to shape the bottom surface of the cutting groove (2); and in the cutting process, the third cutting blade (35) faces and The cutting groove (2) is cut in the direction orthogonal to the cutting feed to completely cut the magnetic body (1); the cutting groove (2) can be carried out while the magnetic body (1) is held by the holding table (13). The formation of) and the shaping of the bottom surface shape of the cutting groove (2) and the complete cutting of the magnetic body (1). Therefore, it is possible to obtain a plurality of concave magnetic cores (3) and magnetic cores (3) from the magnetic body (1). Production efficiency will increase.

Description

Manufacturing method of magnetic core

The present invention relates to a manufacturing method of a magnetic core.

The magnetic core is made of a magnetic material (for example, ferrite) and is incorporated into electronic equipment and used as a transformer or coil. Magnetic cores have various shapes such as E-core, ER-core, PQ-core, LP-core, RM-core and so on. For example, when manufacturing an E-shaped magnetic core, the magnetic material is put into a predetermined mold frame to be hardened to form the desired E-shaped, then the magnetic core is held by a holding table, and the end surface of the magnetic core is fixed by a stone or the like. Grinding is performed to manufacture a magnetic core of a desired shape (for example, refer to Patent Documents 1 to 3 below). [Prior Technical Documents] [Patent Documents]

[Patent Document 1] Japanese Patent Application Publication No. 06-297306 　　 [Patent Document 2] Japanese Patent Application Publication No. 08-148361 　　 [Patent Document 3] Japanese Patent Application Publication No. 2002-231541

[The problem to be solved by the invention]

However, in the above-mentioned manufacturing method, a predetermined mold frame is used to form a magnetic core of a desired shape one at a time, and the magnetic core is held one at a time by a holding table to grind the end surface of the magnetic core. The problem of poor core production efficiency.

The present invention was developed in view of the above-mentioned situation, and aims to be designed to be able to efficiently manufacture a desired magnetic core. [Technical means to solve the problem]

The present invention is a method for manufacturing a concave magnetic core made of a magnetic material. It includes: a holding process to hold a plate-shaped magnetic body by a holding stand; and a groove forming process to form the first groove with a predetermined width. The cutting tool cuts into the magnetic body held by the holding table at a predetermined cutting depth and feeds it in the cutting and feeding direction to form a cutting groove; and the groove shaping process makes it harder than the first cutting tool and uses the first cutting tool The second cutting blade formed with the above width cuts into the cutting groove and feeds it in the cutting and feeding direction to shape the bottom surface of the cutting groove; and in the cutting process, make the third cutting blade face orthogonal to the cutting groove The magnetic body is completely cut by cutting and feeding in the direction of cutting.

In addition, the present invention is a method for manufacturing an E-shaped magnetic core made of a magnetic material, including: a holding process to hold a plate-shaped magnetic body with a holding table; and a groove forming process to form a predetermined width The first cutting tool cuts into the magnetic body held by the holding table at a predetermined cutting depth and feeds it in the cutting and feeding direction to form two cutting grooves; and the groove shaping process makes it harder than the first cutting tool. The second cutting blade formed with a width greater than the first cutting blade cuts into the two cutting grooves and feeds them in the cutting feed direction to shape the bottom surface of the two cutting grooves; and the grinding process, The upper surface of the convex part between the two cutting grooves, or the predetermined surface that will become the upper surface of the convex part between the two cutting grooves, is ground; and the cutting process is to make the third cutting blade face The two cutting grooves are cut in a direction perpendicular to the cutting grooves, and the cutting and feeding direction are cut and fed to completely cut the magnetic body. [Effects of Invention]

The method of manufacturing a concave magnetic core made of a magnetic material of the present invention includes: a holding process to hold a plate-shaped magnetic body by a holding stand; and a groove forming process to make the first cutting formed with a predetermined width The knife cuts into the magnetic body held by the holding table at a predetermined cutting depth and cuts and feeds it in the cutting and feeding direction to form a cutting groove; and the groove shaping process makes it harder than the first cutting tool and uses the first cutting tool to be harder than the first cutting tool. The second cutting blade formed by a wide width cuts into the cutting groove and is fed in the cutting and feeding direction to shape the bottom surface of the cutting groove; and in the cutting process, the third cutting blade is directed to the direction orthogonal to the cutting groove Cut in and feed to cut the magnetic body completely; therefore, the formation of the cutting groove and the shaping of the bottom surface shape of the cutting groove and the completion of the magnetic body can be carried out while the plate-shaped magnetic body is held by the holding table. Cut, so it is possible to obtain a plurality of concave cores from the magnetic body. In this way, the production efficiency of the concave magnetic core will be improved.

In addition, the method for manufacturing an E-shaped magnetic core made of a magnetic material of the present invention includes: a holding process to hold a plate-shaped magnetic body with a holding stand; and a groove forming process to form a groove with a predetermined width The first cutting tool cuts into the magnetic body held by the holding table at a predetermined cutting depth and feeds it in the cutting and feeding direction to form two cutting grooves; and the groove shaping process makes it harder than the first cutting tool. The second cutting blade formed with a width greater than the first cutting blade cuts into the two cutting grooves and feeds them in the cutting feed direction to shape the bottom surfaces of the two cutting grooves; and the grinding process, the 2 The upper surface of the convex portion between the cutting grooves, or the predetermined surface that will become the upper surface of the convex portion between the two cutting grooves, is ground; and the cutting process is performed so that the third cutting blade faces and The two cutting grooves cut in the direction orthogonal to the cutting and feeding direction to cut and feed the magnetic body completely; therefore, it is possible to perform two cuttings while the plate-shaped magnetic body is held by the holding table. The formation of the groove and the shaping of the bottom surface shape of the two cutting grooves and the grinding of the upper surface of the convex part between the two cutting grooves and the complete cutting of the magnetic body, so it is possible to obtain a plurality of E-shaped magnetic cores from the magnetic body. As a result, the production efficiency of E-shaped magnetic cores will be improved.

1 "Cutting device" "The cutting device 10 shown in FIG. 1" is an example of a processing device capable of manufacturing a magnetic core of a predetermined shape made of a magnetic material. The cutting device 10 has a device base 11. On the upper surface 11a of the device base 11, a rectangular holding table 13 having a holding surface 13a for holding a plate-shaped magnetic body is arranged, and the holding table 13 is directed in the cutting feed direction (X-axis direction) cutting and feeding means 20 for cutting and feeding. The holding table 13 is rotatably supported by the rotating support table 14 arranged above the cutting feed means 20. To the holding surface 13a of the holding table 13, a suction source (not shown) is connected.

The cutting and feeding means 20 is provided with a ball screw 21 extending in the X-axis direction, a motor 22 connected to one end of the ball screw 21, a pair of guide rails 23 extending parallel to the ball screw 21, and horizontal to the X-axis direction The mobile base station 24 of the ground movement. On the upper surface of the movable base 24, a rotating support table 14 supporting the holding table 13 is erected. On the lower surface of the movable base 24, a pair of guide rails 23 are slidably connected, and a ball screw 21 is screwed into a nut system formed in the center of the movable base 24. In addition, the ball screw 21 is driven by the motor 22 to rotate, whereby the holding table 13 and the moving base 24 can be moved in the X-axis direction along the guide rail 23 together.

At the rear of the device base 11 in the X-axis direction, a gate-shaped column 12 is erected so as to straddle the cutting feed means 20. On the side of the column frame 12, a first cutting means 30A for forming cutting grooves in the magnetic body, a second cutting means 30B for shaping the bottom surface shape of the cutting grooves formed in the magnetic body, and a cutting groove The third cutting means 30C that cuts the magnetic body whose bottom surface shape has been shaped, and the indexing feeding means that indexing and feeding the first cutting means 30A and the second cutting means 30B in the indexing feeding direction (Y-axis direction) 40A, and indexing feeding means 40B for indexing and feeding the third cutting means 30C in the indexing feeding direction, and the first cutting means 30A, second cutting means 30B, and third cutting means 30C in the cutting feeding direction ( Z-axis direction) cut-in feeding means 50A, 50B, 50C for cut-in feeding.

The indexing feeding means 40A, 40B each have a ball screw 41 extending in the Y-axis direction, a motor 42 connected to the tip of the ball screw 41, and a guide rail 43 extending parallel to the ball screw 41. In addition, the indexing feeding means 40A is provided with two moving plates 44a that move the first cutting means 30A and the second cutting means 30B in the Y-axis direction, and the indexing feeding means 40B is provided with the third cutting means 30C in the Y-axis direction Moving moving board 44b. The guide rails 43 are slidably connected to the sides of the moving plates 44a, 44b, and a ball screw 41 is screwed into a nut system formed at the center of the moving plates 44a, 44b. When the motor 42 of the indexing feeding means 40A is driven to rotate the ball screw 41, the first cutting means 30A and the second cutting means 30B and the two moving plates 44a can be simultaneously indexed and fed in the Y-axis direction. On the other hand, once the motor 42 of the indexing feeding means 40B is driven and the ball screw 41 is rotated, the third cutting means 30C and the moving plate 44b can be indexed and fed in the Y-axis direction together. In addition, in the present embodiment, although the first cutting means 30A and the second cutting means 30B are configured to move in the Y-axis direction at the same time, it is not limited to this configuration.

The cut-in feeding means 50A, 50B are each mounted on each moving plate 44a. The cutting and feeding means 50A, 50B each have a ball screw 51 extending in the Z-axis direction, a motor 52 connected to one end of the ball screw 51, a pair of guide rails 53 extending parallel to the ball screw 51, and a first The cutting means 30A and the second cutting means 30B are respectively lifted and lowered in the Z-axis direction. A pair of guide rails 53 are slidably connected to the sides of the lifting plate 54a, and a ball screw 51 is screwed into a nut formed at the center of the lifting plate 54a. Once the motor 52 of the cutting feed means 50A, 50B is driven and the ball screw 51 rotates, the lift plate 54a is guided by the guide rail 53 to move in the Z-axis direction, and the first cutting means 30A and the second cutting means 30B can be moved toward each Feed in the Z-axis direction. On the other hand, the cut-in feeding means 50C is installed on the moving plate 44b. The cut-in feeding means 50C is provided with a lift plate 54b for raising and lowering the third cutting means 30C in the Z-axis direction, and the structure other than the lifting plate 54b is the same as the cut-in feeding means 50A. A pair of guide rails 53 are slidably connected to the sides of the lifting plate 54b, and a ball screw 51 is screwed into a nut formed at the center of the lifting plate 54b. Once the ball screw 51 is driven and rotated by the motor 52 of the cutting and feeding means 50C, the lifting plate 54b is guided by the guide rail 53 to move in the Z-axis direction, and the third cutting means 30C can be cut and fed in the Z-axis direction. .

The first cutting means 30A includes at least a spindle 31 having a shaft center in the rotation axis direction (Y-axis direction), and a first cutting blade 32 attached to the tip of the spindle 31. The first cutting blade 32, as shown in FIG. 2(b), is composed of a disc-shaped stone which is formed by fixing predetermined stone particles with a bonding agent and sintering them. As the bonding agent, for example, metal bonding, vitrified bonding, resin bonding, and the like are used. When metal bonding is used as the bonding agent, for example, it is preferable to use a bonding agent based on an alloy that is not affected by magnetic force, such as cobalt (Co) or nickel (Ni). The thickness of the first cutting blade 32 is not particularly limited, and the thickness can be appropriately changed according to the shape of the magnetic core to be manufactured. With the first cutting blade 32, the magnetic body held by the holding table 13 is cut along the longitudinal direction of the magnetic body and cut, thereby forming a concave cutting groove extending in the longitudinal direction.

The second cutting means 30B includes at least a mandrel 31 and a second cutting blade 34 attached to the tip of the mandrel 31. The second cutting blade 34 is composed of a disc-shaped wheelstone formed by electrodeposition of diamond particles on the surface of the base 33 shown in FIG. 2(c). The second cutting blade 34 is harder than the above-mentioned first cutting blade 32, and the diamond particles are not easy to fall off, and are formed with a width greater than or equal to the first cutting blade 32. Here, the surface condition of the bottom surface of the cutting groove formed by the first cutting blade 32 is rough, and the intersection portion (corner portion) between the bottom surface of the cutting groove and the side surface connected thereto is formed in, for example, an R shape. Therefore, the second cutting blade 34 is harder than the first cutting blade 32 and is configured to be wider than the width of the first cutting blade 32, so that both outer surfaces of the second cutting blade 34 can be brought into contact with each other for the first cutting. The knife 32 cuts the two inner side surfaces of the groove after cutting to make them cut, and the bottom surface shape is trimmed to a desired shape. The base 33 is preferably something that is not affected by magnetic force, such as an aluminum base.

As shown in FIG. 2(d), the third cutting means 30C includes at least a mandrel 31 and a third cutting blade 35 attached to the tip end of the mandrel 31. The third cutting blade 35 is formed with a width smaller than that of the first cutting blade 32, and is composed of a disc-shaped thin stone which is formed by fixing predetermined stone particles with a bonding agent and sintering them. . The third cutting blade 35 cuts in a direction orthogonal to the extending direction of the cutting groove and cuts, thereby completely cutting the magnetic body.

2" The first example of the method of manufacturing a magnetic core "Next, a method of manufacturing a concave magnetic core made of a magnetic material by cutting the plate-shaped magnetic body 1 using the cutting device 10 described above will be described. The magnetic body 1 is an example of a magnetic material before being divided into a concave magnetic core, and is composed of, for example, a rectangular ferrite.

(1) The holding process is in a state where the longitudinal direction of the holding table 13 shown in FIG. 1 faces the cutting feed direction (X-axis direction), as shown in Figure 2(a), which is parallel to the longitudinal direction of the holding table 13 In the direction of the direction, the magnetic body 1 is placed on the holding surface 13a of the holding table 13, and the attractive force of a suction source (not shown) acts on the holding surface 13a to attract and hold the magnetic body 1 on the holding surface 13a.

(2) Groove formation process After the holding process is performed, the holding table 13 holding the magnetic body 1 is cut and fed, for example, in the +X direction by the cutting and feeding means 20 shown in FIG. 1, and the holding table 13 is moved to the first On the lower side of the cutting means 30A, by the indexing feeding means 40A, the first cutting means 30A is moved to above the position where the first cutting blade 32 should cut into the magnetic body 1 (the central part of the magnetic body 1).

As shown in FIG. 2(b), the spindle 31 rotates to make the first cutting blade 32 rotate in the direction of arrow A, and at the same time, the first cutting blade 32 is applied to the magnetic body 1 by the cutting feed means 50A shown in FIG. For example, the cutting and feeding are performed in the -Z direction, the first cutting blade 32 is cut into the magnetic body 1 with a predetermined cutting depth, the holding table 13 is cut and fed in the +X direction, for example, and the first cutting blade 32 gradually grinds the center of the magnetic body 1 In part, a concave cutting groove 2 extending in the X-axis direction is formed. The surface condition of the bottom surface 2a of the cutting groove 2 is rough, and the intersection portion (corner portion) between the bottom surface 2a of the cutting groove 2 and the side surface connected thereto is formed in, for example, an R shape.

(3) Groove shaping process 　　 After implementing the groove forming process, the second cutting blade 34 is positioned directly above the cutting groove 2 by the indexing feeding means 40A shown in FIG. 1. As shown in FIG. 2(c), the spindle 31 rotates to make the second cutting blade 34 rotate in the direction of arrow A, for example, and at the same time, the second cutting blade 34 is applied to the magnetic body 1 by the cutting feed means 50B shown in FIG. For example, the cutting and feeding are performed in the -Z direction, the second cutting blade 34 is cut into the cutting groove 2, and the holding table 13 is cut and fed in the +X direction, and the second cutting blade 34 gradually grinds the bottom surface 2a of the cutting groove 2, and the cutting groove 2 The shape of the bottom surface is reshaped. In this way, the bottom surface 2a of the cutting groove 2 becomes flat, and the corners of the R shape are removed, so the bottom surface shape of the cutting groove 2 is adjusted to a desired state. In this way, the magnetic body 1 maintains the state of extending in the X-axis direction and the cross section is formed into a desired concave shape.

(4) Cutting process After the trench shaping process is performed, the holding table 13 is rotated by 90°, for example, by the rotating support table 14 shown in FIG. 1, thereby, as shown in FIG. 2(d), the length of the magnetic body 1 is increased. The side direction is toward the Y-axis direction. By the indexing feeding means 40B shown in FIG. 1, the third cutting means 30C is moved to a predetermined position where the third cutting blade 35 cuts the magnetic body 1.

Next, the mandrel 31 rotates to make the third cutter 35 rotate in the direction of arrow A, and at the same time, the third cutter 35 is directed toward the magnetic body 1 in the -Z direction by the cutting feed means 50C as shown in FIG. Cutting and feeding are performed, the third cutting blade 35 is cut in a direction orthogonal to the extending direction (Y-axis direction) of the cutting groove 2, and the holding table 13 is cut and fed in the +X direction, for example, to completely cut the magnetic body 1. Thus, the concave magnetic core 3 is divided. Then, the indexing and feeding means 40B shown in FIG. 1 index and feed the third cutting means 30C in the -Y direction, for example, at predetermined intervals, while repeatedly performing the above-mentioned cutting operation, to produce a plurality of pieces from the magnetic body 1. Concave core 3.

In this way, according to the first example of the manufacturing method of the magnetic core, the groove forming process is performed, in which the plate-shaped magnetic body 1 is held by the holding table 13, and the first cutter formed with a predetermined width is made 32 Cut into the magnetic body 1 with a predetermined cutting depth and feed it in the cutting and feeding direction to form the cutting groove 2; and groove shaping process to make it harder than the first cutter 32 and form it with a width greater than that of the first cutter 32 The second cutter 34 cuts into the cutting groove 2 and feeds it in the cutting feed direction to shape the bottom surface of the cutting groove 2; and in the cutting process, the third cutter 35 is directed perpendicular to the extending direction of the cutting groove 2. The magnetic body 1 is completely cut by cutting and feeding in the direction of cutting; therefore, a plurality of concave magnetic cores 3 can be obtained from the magnetic body 1 extending in the cutting and feeding direction (X-axis direction), and the production efficiency of the magnetic core 3 is improved.

3" The second example of the method of manufacturing a magnetic core "Next, a method of manufacturing an E-shaped magnetic core made of a magnetic material by cutting the plate-shaped magnetic body 4 using the above-mentioned cutting device 10 will be described. The magnetic body 4 is an example of a magnetic material before being divided into E-shaped magnetic cores. Like the magnetic body 1 described above, it is composed of, for example, a rectangular ferrite.

(1) The holding process is in the state where the longitudinal direction of the holding table 13 shown in FIG. 1 faces the cutting feed direction (X-axis direction), as shown in FIG. 3(a), which is parallel to the longitudinal direction of the holding table 13 In the direction of the direction, the magnetic body 4 is placed on the holding surface 13a of the holding table 13, so that the attractive force of a suction source (not shown) acts on the holding surface 13a to attract and hold the magnetic body 4 on the holding surface 13a.

(2) Groove formation process After the holding process is performed, the holding table 13 holding the magnetic body 4 is cut and fed, for example, in the +X direction by the cutting and feeding means 20 shown in FIG. 1, and the holding table 13 is moved to the first The lower side of the cutting means 30A. In the second example, in order to leave the central part of the magnetic body 4, cutting grooves are formed on both outer sides (± Y direction side) of the central part, and the first cutting means 30A are moved separately by the indexing feeding means 40A The first cutting blade 32 should cut above the two positions of the magnetic body 4. The two positions refer to a position deviated from the +Y direction side by a predetermined distance based on the central part of the magnetic body 4 and a position deviated from the -Y direction side by a predetermined distance based on the central part of the magnetic body 4.

By the indexing feeding means 40A, the first cutting blade 32 is positioned to a position offset by a predetermined distance to the +Y direction side with reference to the central part of the magnetic body 4, for example, the spindle 31 is rotated to make the first cutting blade 32, for example Rotate in the direction of arrow A, and at the same time, by the cutting and feeding means 50A shown in FIG. 1, the first cutting blade 32 is cut and fed to the magnetic body 4, for example, in the -Z direction, and the fourth cutting blade 32 is cut at a predetermined cutting depth. For the magnetic body 1, the holding table 13 is cut and fed in the +X direction, for example, and the first cutting blade 32 gradually grinds the outer side (+Y direction side) of the central portion of the magnetic body 4 to form a concave cutting groove extending in the X-axis direction 5.

Next, by the indexing feeding means 40A, the first cutting blade 32 is positioned to a position offset by a predetermined distance from the central part of the magnetic body 4, for example, to the -Y direction side, and the groove forming operation as described above is performed. The cutting blade 32 gradually grinds the outer side (-Y direction side) of the central portion of the magnetic body 4 to form a concave cutting groove 6 extending in the X-axis direction. The bottom surfaces 5a, 6a of the cutting grooves 5, 6 have rough surface conditions, and the intersections (corners) of the bottom surfaces 5a, 6a of the cutting grooves 5, 6 and the side surfaces connected thereto are formed in an R shape, for example. In addition, between the two cutting grooves 5 and 6 formed in this manner, a convex portion 7 extending in the X-axis direction is formed.

(3) Groove shaping process After the groove forming process is implemented, the second cutting blade 34 is positioned, for example, directly above the cutting groove 5 by the indexing feeding means 40A shown in Fig. 1, as shown in Fig. 3(c) , The spindle 31 rotates to make the second cutter 34 rotate in the direction of arrow A, and at the same time, the second cutter 34 is cut and fed to the magnetic body 4 in the -Z direction by the cutting and feeding means 50B shown in FIG. , The second cutting blade 34 is cut into the cutting groove 5, the holding table 13 is cut and fed in the +X direction, for example, and the second cutting blade 34 gradually grinds the bottom surface 5a of the cutting groove 5 to shape the bottom surface of the cutting groove 5. Next, the second cutting blade 34 is positioned directly above the cutting groove 6 by the indexing feeding means 40A shown in FIG. 1, and the above-mentioned shaping operation is performed. The second cutting blade 34 gradually grinds the cutting groove 6 The bottom surface 6a reshapes the shape of the bottom surface of the cutting groove 6. In this way, the bottom surfaces 5a, 6a of the cutting grooves 5, 6 become flat, and the corners of the R shape are removed, so the bottom surface shapes of the cutting grooves 5, 6 are adjusted to a desired state.

(4) Grinding process "As shown in Fig. 3(d), for example, a second cutting means 30B is used to grind the upper surface 7a of the convex portion 7 between the two cutting grooves 5 and 6. Specifically, the second cutting blade 34 is positioned directly above the convex portion 7 of the magnetic body 4 by the indexing feeding means 40A shown in FIG. 1. Thereafter, the mandrel 31 rotates to make the second cutting blade 34 rotate in the direction of arrow A, for example, and at the same time, by cutting and feeding means 50B, the second cutting blade 34 is cut and fed to the magnetic body 4 in the -Z direction, for example, and the convex The upper surface 7a of the part 7 is ground by a predetermined amount. Then, the holding table 13 is cut and fed in the +X direction, for example, and the second cutting blade 34 gradually grinds the upper surface 7a of the convex portion 7 to reduce the height of the upper surface 7a. In this way, the magnetic body 4 maintains the state of extending in the X-axis direction and the cross section is formed into a desired E-shape.

Although the above-mentioned grinding work is described as being implemented after the trench shaping work, it is not limited to this, and the grinding work may be implemented after the trench forming work and before the trench shaping work. In addition, after the maintenance project has been implemented, the grinding project can be implemented first, followed by the trench formation project and the trench shaping project in order. When the grinding process is carried out in this order, it will become the predetermined surface (the central part of the magnetic body 4) of the upper surface 7a of the convex portion 7 between the two cutting grooves 5 and 6 formed in the subsequent groove forming process. Top) Grinding with the first cutter 32 or the second cutter 34.

(5) Cutting process After all the above-mentioned processes are completed, the holding table 13 is rotated by 90°, for example, by the rotating support table 14 shown in FIG. 1, thereby, as shown in FIG. 3(e), the length of the magnetic body 4 is increased. The side direction is toward the Y-axis direction. By the indexing feeding means 40B shown in FIG. 1, the third cutting means 30C is moved to a predetermined position where the third cutting blade 35 cuts the magnetic body 4.

Next, the mandrel 31 rotates to make the third cutter 35 rotate in the direction of arrow A, and at the same time, the third cutter 35 is directed toward the magnetic body 4 in the -Z direction by the cutting feed means 50C as shown in FIG. Cut and feed, make the third cutting blade 35 cut in a direction orthogonal to the extending direction of the cutting grooves 5 and 6 (Y-axis direction), and cut and feed the holding table 13 in the +X direction, for example, to completely cut the magnetic body 4 Break, thereby dividing the E-shaped magnetic core 8. Then, the indexing and feeding means 40B shown in FIG. 1 index and feed the third cutting means 30C in the -Y direction at predetermined intervals, while repeatedly performing the above-mentioned cutting operation to produce a plurality of pieces from the magnetic body 4. E-type magnetic core 8.

In this way, according to the second example of the manufacturing method of the magnetic core, the groove forming process is performed, in which the plate-shaped magnetic body 4 is held by the holding table 13, and the first cutter formed with a predetermined width is made 32 Cut into the magnetic body 4 with a predetermined cutting depth and cut and feed it in the cutting and feeding direction to form two cutting grooves 5 and 6; and groove shaping work to make it harder than the first cutter 32 and use the first cutter 32 or more The second cutting blade 34 formed with a wide width cuts into the cutting grooves 5 and 6 and feeds it in the cutting and feeding direction to shape the bottom surface of the cutting grooves 5 and 6; and in the grinding process, the two cutting grooves 5 and 6 are cut and fed. The upper surface 7a of the convex portion 7 between the two cutting grooves 5, 6 or the predetermined surface of the upper surface 7a of the convex portion 7 between the two cutting grooves 5 and 6 is ground by the first cutter 32 or the second cutter 34; and In the cutting process, the third cutting blade 35 is cut in a direction orthogonal to the extending direction of the cutting grooves 5 and 6 to be cut and fed to completely cut the magnetic body 4; therefore, it can extend from the cutting and feeding direction (X-axis direction) A plurality of E-shaped magnetic cores 8 are obtained from the magnetic body 4, and the production efficiency of the magnetic cores 8 will be improved.

1‧‧‧Magnetic body 2‧‧‧Cutting groove 3‧‧‧Magnetic core 4‧‧‧Magnetic body 5,6‧‧‧Cutting groove7‧‧‧Protrusion 8‧‧‧Magnetic core 10‧‧‧Cutting device 11‧‧‧Device base 11a‧‧‧Upper 12‧‧‧Column frame 13‧‧‧Retaining table 13a‧‧‧Retaining surface 14‧‧‧Rotating support table 20‧‧‧Cutting feeding means 21‧‧‧Ball screw 22‧‧‧Motor 23‧‧‧Guide rail 24‧‧‧Moving base 30A‧‧‧The first cutting means 30B‧‧‧The second cutting means 30C‧‧‧The third cutting means 31‧‧‧Mandrel 32‧‧ ‧First cutter 33‧‧‧Base 34‧‧‧Second cutter 35‧‧‧Third cutter 40A, 40B‧‧‧Indexing feeding means 41‧‧‧Ball screw 42‧‧‧Motor 43‧ ‧‧Guide rail 44a, 44b‧‧‧Moving plate 50A, 50B, 50C‧‧‧Cutting feed means 51‧‧‧Ball screw 52‧‧Motor 53‧‧‧Guide 54a, 54b‧‧‧Lifting plate

[Fig. 1] A schematic perspective view of the configuration of an example of a cutting device.　　[Figure 2] A schematic perspective view of the manufacturing method of the magnetic core for manufacturing the concave magnetic core.　　[Figure 3] A schematic perspective view of the manufacturing method of the magnetic core of the E-shaped magnetic core.

1‧‧‧Magnetic

2‧‧‧Cutting groove

2a‧‧‧Bottom

3‧‧‧Magnetic core

13‧‧‧Holding station

13a‧‧‧Keep the surface

30A‧‧‧The first cutting method

30B‧‧‧Second cutting method

30C‧‧‧The third cutting method

31‧‧‧Mandrel

32‧‧‧The first cutter

33‧‧‧Abutment

34‧‧‧Second Cutter

35‧‧‧3rd cutter

Claims (2)

A method of manufacturing a magnetic core, which is a method of manufacturing a concave magnetic core made of magnetic materials, which includes: 　　 holding process to hold a plate-shaped magnetic body with a holding table; and groove forming process to make a predetermined width The formed first cutting blade cuts into the magnetic body held by the holding table at a predetermined cutting depth and feeds it in the cutting and feeding direction to form a cutting groove; and the groove shaping process makes it harder than the first cutting blade. The second cutting blade formed with a width greater than the first cutting blade cuts into the cutting groove and feeds it in the cutting feed direction to shape the bottom surface of the cutting groove; and the cutting process, the third cutting blade faces the cutting The groove is cut in the direction orthogonal to the groove and is cut and fed to completely cut the magnetic body. A method of manufacturing a magnetic core, which is a method of manufacturing an E-shaped magnetic core made of a magnetic material, which includes: 　　 holding process, a plate-shaped magnetic body is held by a holding table; and a groove forming process to make a predetermined width The first cutting blade formed by the web cuts into the magnetic body held by the holding table at a predetermined cutting depth and is cut and fed in the cutting and feeding direction to form two cutting grooves; and the groove shaping process makes it harder and harder than the first cutting blade A second cutter formed with a width greater than or equal to the first cutter cuts into the two cutting grooves and cuts and feeds them in the cutting feed direction to shape the bottom surfaces of the two cutting grooves; and a grinding process, The upper surface of the convex part between the two cutting grooves, or the predetermined surface that will become the upper surface of the convex part between the two cutting grooves, is ground; and the cutting process is to make the third cutting tool The magnetic body is completely cut by cutting in a direction orthogonal to the two cutting grooves and cutting and feeding in the cutting and feeding direction.

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