JP2018133388A - Manufacturing method of magnetic core - Google Patents

Abstract

An object of the present invention is to efficiently manufacture a desired magnetic core. The present invention provides a holding step of holding a plate-shaped magnetic body by a holding table, and cutting a first cutting blade into a magnetic body held by the holding table at a predetermined cutting depth. A groove forming step of forming a cutting groove 2 by cutting and feeding; and cutting a second cutting blade 34 which is harder than the first cutting blade 32 and has a width equal to or larger than the first cutting blade 32 into the cutting groove 2. A groove shaping step for shaping the bottom surface of the cutting groove 2 by cutting and feeding, and a cutting for cutting the magnetic body 1 completely by cutting the third cutting blade 35 in a direction orthogonal to the cutting groove 2 and sending the cutting. In the state where the magnetic body 1 is held by the holding table 13, the formation of the cutting groove 2, the shaping of the bottom shape of the cutting groove 2, and the complete cutting of the magnetic body 1 can be performed. A concave magnetic core 3 can be obtained, To improve efficiency of production. [Selection diagram] FIG.

Description

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

  The magnetic core is made of a magnetic material (for example, ferrite), and is used by being incorporated in an electronic device or the like as a transformer or a coil. There are various types of magnetic cores such as an E-type core, an ER-type core, a PQ-type core, an LP-type core, and an RM-type core. For example, when manufacturing an E-type magnetic core, a magnetic material is put into a predetermined mold and baked and formed into a desired E-type, and then the magnetic core is held by a holding table and is then magnetically ground by a grindstone or the like. A magnetic core having a desired shape is manufactured by grinding the end face of the substrate (for example, see Patent Documents 1-3 below).

Japanese Patent Laid-Open No. 06-297306 Japanese Patent Laid-Open No. 08-148361 JP 2002-231541 A

  However, in the above manufacturing method, magnetic cores having a desired shape are formed one by one in a predetermined formwork, and the end surfaces of the magnetic cores are ground by holding the magnetic cores one by one with a holding table. There is a problem that the production efficiency of the magnetic core is poor.

  The present invention has been made in view of the above circumstances, and an object thereof is to enable a desired magnetic core to be efficiently manufactured.

  The present invention relates to a method of manufacturing a concave magnetic core made of a magnetic material, a holding step of holding a plate-like magnetic body with a holding table, and a first cutting blade formed with a predetermined width with a predetermined cut. A groove forming step of cutting into a magnetic body held by the holding table at a depth and cutting and feeding in a cutting feed direction to form a cutting groove; and harder than the first cutting blade and higher than the first cutting blade A groove shaping step of cutting a second cutting blade formed with a width into the cutting groove and cutting and feeding it in the cutting feed direction to shape the bottom shape of the cutting groove, and a third direction perpendicular to the cutting groove. A cutting step of cutting and feeding the cutting blade to completely cut the magnetic body.

  The present invention is also a method for manufacturing an E-type magnetic core made of a magnetic material, comprising: a holding step of holding a plate-like magnetic body with a holding table; and a first cutting blade formed with a predetermined width. A groove forming step of cutting into a magnetic body held by the holding table at a predetermined cutting depth and cutting-feeding in the cutting feed direction to form two cutting grooves; and the first cutting blade being harder than the first cutting blade A groove shaping step in which a second cutting blade formed with a width equal to or larger than the cutting blade is cut into the two cutting grooves and cut and fed in the cutting feed direction to shape the bottom shape of the two cutting grooves; A grinding step of grinding an upper surface of the convex portion between the two cutting grooves or a surface to be the upper surface of the convex portion between the two cutting grooves; and Cut the third cutting blade in the direction perpendicular to the cutting feed direction And a, a cutting step of completely cutting the magnetic material and.

  The method of manufacturing a concave magnetic core made of a magnetic material according to the present invention includes a holding step of holding a plate-like magnetic body with a holding table, and a first cutting blade formed with a predetermined width with a predetermined cutting depth. A groove forming step of cutting into the magnetic material held by the holding table and cutting and feeding in the cutting feed direction to form a cutting groove, and a width larger than the first cutting blade and harder than the first cutting blade A groove shaping step of cutting the formed second cutting blade into the cutting groove and cutting and feeding in the cutting feed direction to shape the bottom shape of the cutting groove, and a third cutting in a direction perpendicular to the cutting groove A cutting step of cutting the blade and feeding it to completely cut the magnetic body, so that the cutting groove is formed and the bottom shape of the cutting groove is shaped and magnetized while the plate-like magnetic body is held by the holding table. Can be done with complete amputation of the body It is possible to obtain a plurality of concave magnetic core of a magnetic material. This improves the production efficiency of the concave magnetic core.

  The method of manufacturing an E-type magnetic core made of a magnetic material according to the present invention includes a holding step of holding a plate-like magnetic body with a holding table, and a first cutting blade formed with a predetermined width. A groove forming step in which two cutting grooves are formed by cutting into a magnetic material held by the holding table at a cutting depth and cutting in the cutting feed direction; and the first cutting blade being harder than the first cutting blade A groove shaping step of cutting the second cutting blade formed with the above width into the two cutting grooves and cutting and feeding in the cutting feed direction to shape the bottom shape of the two cutting grooves; A grinding step of grinding an upper surface of the convex portion between the two cutting grooves or a surface to be the upper surface of the convex portion between the two cutting grooves, and a right angle to the two cutting grooves Cut the third cutting blade in the direction and cut feed in the cutting feed direction A cutting step for completely cutting the magnetic body, and in the state where the plate-like magnetic body is held by the holding table, between the formation of the two cutting grooves, the shaping of the bottom shape of the two cutting grooves, and the two cutting grooves. The top surface of the convex portion can be ground and the magnetic body can be completely cut, and a plurality of E-type magnetic cores can be obtained from the magnetic body. This improves the production efficiency of the E-type magnetic core.

It is a perspective view which shows the structure of an example of a cutting device. It is a perspective view which shows the manufacturing method of the magnetic core which manufactures a concave-shaped magnetic core. It is a perspective view which shows the manufacturing method of the magnetic core which manufactures an E-type magnetic core.

1 Cutting Device A cutting device 10 shown in FIG. 1 is an example of a processing device capable of manufacturing a magnetic core having a predetermined shape made of a magnetic material. The cutting device 10 includes a device base 11, and a rectangular holding table 13 having a holding surface 13 a for holding a plate-like magnetic body on an upper surface 11 a of the device base 11, and a holding table 13 in a cutting feed direction ( A cutting feed means 20 for cutting and feeding in the X-axis direction) is provided. The holding table 13 is rotatably supported by a rotation support base 14 disposed on the cutting feed means 20. A suction source (not shown) is connected to the holding surface 13 a of the holding table 13.

  The cutting feed means 20 includes 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 in parallel with the ball screw 21, and horizontally in the X-axis direction. A movable base 24 is provided. On the upper surface of the movable base 24, a rotation support base 14 that supports the holding table 13 is erected. A pair of guide rails 23 are in sliding contact with the lower surface of the moving base 24, and a ball screw 21 is screwed into a nut formed in the center of the moving base 24. When the ball screw 21 is rotated by being driven by the motor 22, the holding table 13 together with the moving base 24 can be moved along the guide rail 23 in the X-axis direction.

  A portal column 12 is erected so as to straddle the cutting feed means 20 at the rear portion in the X-axis direction of the apparatus base 11. On the side of the column 12, a first cutting means 30A for forming a cutting groove in the magnetic material, a second cutting means 30B for shaping the bottom shape of the cutting groove formed in the magnetic material, and the bottom surface of the cutting groove Third cutting means 30C for cutting the shaped magnetic body, index feeding means 40A for indexing and feeding the first cutting means 30A and the second cutting means 30B in the index feeding direction (Y-axis direction), the first Indexing feed means 40B for indexing and feeding the three cutting means 30C in the indexing feed direction, and the first cutting means 30A, the second cutting means 30B and the third cutting means 30C in the cutting feed direction (Z-axis direction), respectively. Cutting feed means 50A, 50B and 50C for cutting and feeding are provided.

  The index feeding means 40A and 40B are each provided with 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 in parallel with the ball screw 41. The index feeding means 40A includes two moving plates 44a that move the first cutting means 30A and the second cutting means 30B in the Y-axis direction. The index feeding means 40B is configured to move the third cutting means 30C to Y. A moving plate 44b for moving in the axial direction is provided. Each guide rail 43 is in sliding contact with the side portions of the moving plates 44a and 44b, and a ball screw 41 is screwed into a nut formed at the center of the moving plates 44a and 44b. When the motor 42 of the index feeding means 40A is driven to rotate the ball screw 41, the first cutting means 30A and the second cutting means 30B can be simultaneously indexed and fed in the Y-axis direction together with the two moving plates 44a. On the other hand, when the motor 42 of the index feeding means 40B is driven to rotate the ball screw 41, the third cutting means 30C can be indexed and fed in the Y-axis direction together with the moving plate 44b. In the present embodiment, the first cutting means 30A and the second cutting means 30B are configured to move in the Y-axis direction at the same time. However, the present invention is not limited to this configuration.

  The cutting feed means 50A and 50B are attached to the respective moving plates 44a. The cutting feed means 50A, 50B includes 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 in parallel to the ball screw 51, and a first cutting. There are provided a lifting plate 54a for lifting and lowering the means 30A and the second cutting means 30B in the Z-axis direction. A pair of guide rails 53 is in sliding contact with the side of the elevating plate 54a, and a ball screw 51 is screwed into a nut formed in the central portion of the elevating plate 54a. When the motor 52 of the cutting feed means 50A, 50B is driven and the ball screw 51 is rotated, the elevating plate 54a is guided by the guide rail 53 and moves in the Z-axis direction, and the first cutting means 30A, the second cutting means 30B can be cut and fed in the Z-axis direction. On the other hand, the cutting feed means 50C is attached to the moving plate 44b. The cutting feed means 50C includes a lifting plate 54b that lifts and lowers the third cutting means 30C in the Z-axis direction, and the configuration other than the lifting plate 54b is the same as that of the cutting feed means 50A. A pair of guide rails 53 are in sliding contact with the side of the elevating plate 54b, and a ball screw 51 is screwed into a nut formed in the center of the elevating plate 54b. When the ball screw 51 is rotated by being driven by the motor 52 of the cutting and feeding means 50C, the elevating plate 54b is guided by the guide rail 53 and moves in the Z-axis direction to cut and feed the third cutting means 30C in the Z-axis direction. be able to.

  The first cutting means 30 </ b> A includes at least a spindle 31 having an axis in the rotation axis direction (Y-axis direction) and a first cutting blade 32 attached to the tip of the spindle 31. As shown in FIG. 2B, the first cutting blade 32 is constituted by a disc-shaped grindstone in which predetermined abrasive grains are hardened with a bonding agent and sintered. As the bonding agent, for example, a metal bond, a vitrified bond, a resin bond or the like is used. When a metal bond is used as the bonding agent, 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 1st cutting blade 32 is not specifically limited, It is good to change thickness suitably according to the shape of the magnetic core which it is going to manufacture. In the first cutting blade 32, a concave cutting groove extending in the longitudinal direction is formed by cutting the magnetic body held on the holding table 13 along the longitudinal direction of the magnetic body and cutting the magnetic body. it can.

  The second cutting means 30 </ b> B includes at least a spindle 31 and a second cutting blade 34 attached to the tip of the spindle 31. The 2nd cutting blade 34 is comprised by the disk-shaped grindstone which made the diamond abrasive grain electrodeposit on the surface of the base 33 shown in FIG.2 (c). The second cutting blade 34 is harder than the first cutting blade 32 described above, and the diamond abrasive grains are less likely to fall off. The second cutting blade 34 is formed with a width greater than that of the first cutting blade 32. Here, the surface state of the bottom surface of the cutting groove formed by the first cutting blade 32 is rough, and the intersection (corner portion) between the bottom surface of the cutting groove and the side surface connected to the bottom surface is formed in, for example, an R shape. Is done. Therefore, the second cutting blade 34 is harder than the first cutting blade 32 and is configured to be larger than the width of the first cutting blade 32, thereby cutting grooves cut by the first cutting blade 32. Both the inner side surfaces of the second cutting blade 34 are brought into contact with the outer side surfaces of the second cutting blade 34, and the bottom shape can be finished to a desired shape. The base 33 is preferably not affected by the magnetic force, and is composed of, for example, an aluminum base.

  As shown in FIG. 2D, the third cutting means 30 </ b> C includes at least a spindle 31 and a third cutting blade 35 attached to the tip of the spindle 31. The third cutting blade 35 is formed of a disc-shaped thin grindstone that is formed with a width smaller than that of the first cutting blade 32 and in which predetermined abrasive grains are hardened with a bonding agent and sintered. With the third cutting blade 35, the magnetic body can be completely cut by cutting in a direction perpendicular to the extending direction of the cutting groove.

2 First Example of Manufacturing Method of Magnetic Core Next, a manufacturing method for manufacturing a concave magnetic core made of a magnetic material by cutting the plate-like magnetic body 1 using the cutting device 10 will be described. The magnetic body 1 is an example of a magnetic material before being divided into concave magnetic cores, and is made of, for example, a ferrite formed in a rectangular shape.

(1) Holding Step As shown in FIG. 2 (a), the direction parallel to the longitudinal direction of the holding table 13 with the longitudinal direction of the holding table 13 shown in FIG. 1 facing the cutting feed direction (X-axis direction). In this direction, the magnetic body 1 is placed on the holding surface 13a of the holding table 13, and the suction force of a suction source (not shown) is applied to the holding surface 13a to attract and hold the magnetic body 1 by the holding surface 13a.

(2) Groove forming step After the holding step, the holding table 13 holding the magnetic body 1 is cut and fed in the + X direction, for example, by the cutting feed means 20 shown in FIG. The first cutting means 30A is moved above the position where the first cutting blade 32 should be cut into the magnetic body 1 (the central portion of the magnetic body 1) by the index feed means 40A. .

  As shown in FIG. 2B, the spindle 31 is rotated, and the first cutting blade 32 is rotated by, for example, the cutting feed means 50A shown in FIG. For example, the magnetic body 1 is cut and fed in the −Z direction, the first cutting blade 32 is cut into the magnetic body 1 with a predetermined cutting depth, and the holding table 13 is cut and fed in the + X direction, for example. One cutting blade 32 cuts the central portion of the magnetic body 1 to form a concave cutting groove 2 extending in the X-axis direction. The surface state of the bottom surface 2a of the cutting groove 2 is rough, and the intersection (corner portion) between the bottom surface 2a of the cutting groove 2 and the side surface connected to the bottom surface 2a is formed in an R shape, for example.

(3) Groove shaping step After performing the groove forming step, the second cutting blade 34 is positioned directly above the cutting groove 2 by the index feeding means 40A shown in FIG. As shown in FIG. 2 (c), the spindle 31 rotates and the second cutting blade 34 is rotated by, for example, the cutting feed means 50B shown in FIG. The second cutting blade 34 is cut and fed to the magnetic body 1 in the −Z direction, for example, and 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, for example. The bottom surface 2a of the cutting groove 2 is cut, and the bottom shape of the cutting groove 2 is shaped. Thereby, the bottom surface 2a of the cutting groove 2 becomes flat and the corners of the R shape are removed, so that the bottom surface shape of the cutting groove 2 is shaped into a desired state. In this way, the magnetic body 1 is formed in a desired concave shape in cross section while extending in the X-axis direction.

(4) Cutting process After performing the groove shaping process, the holding table 13 is rotated by, for example, 90 ° by the rotation support base 14 shown in FIG. Is directed in the Y-axis direction. The third cutting blade 30C is moved to a predetermined position where the third cutting blade 35 cuts the magnetic body 1 by the index feeding means 40B shown in FIG.

  Next, the spindle 31 is rotated, and the third cutting blade 35 is rotated with respect to the magnetic body 1 by, for example, the magnetic material 1 by the cutting feed means 50C shown in FIG. Cutting in the Z direction and cutting the third cutting blade 35 in a direction perpendicular to the extending direction of the cutting groove 2 (Y-axis direction) and cutting and feeding the holding table 13 in the + X direction, for example. By completely cutting the body 1, it is divided into concave magnetic cores 3. The index feeding means 40B shown in FIG. 1 repeats the above-described cutting operation while indexing and feeding the third cutting means 30C at a predetermined interval, for example, in the −Y direction. The core 3 is manufactured.

  Thus, in the first example of the magnetic core manufacturing method, the first cutting blade 32 formed with a predetermined width is held at a predetermined cutting depth while the plate-like magnetic body 1 is held by the holding table 13. And a groove forming step of forming the cutting groove 2 by cutting in the magnetic body 1 and cutting and feeding in the cutting feed direction, and a first hard blade that is harder than the first cutting blade 32 and has a width greater than that of the first cutting blade 32. The cutting blade 34 is cut into the cutting groove 2 and cut and fed in the cutting feed direction to shape the bottom shape of the cutting groove 2, and a third direction is perpendicular to the extending direction of the cutting groove 2. A plurality of concave magnetic cores 3 are obtained from the magnetic body 1 extending in the cutting feed direction (X-axis direction) in order to perform the cutting process of cutting the cutting blade 35 and cutting and feeding it to completely cut the magnetic body 1. Can improve the production efficiency of the magnetic core 3

3 Second Example of Manufacturing Method of Magnetic Core Next, a manufacturing method of manufacturing an E-type magnetic core made of a magnetic material by cutting the plate-like magnetic body 4 using the cutting device 10 will be described. The magnetic body 4 is an example of a magnetic material before being divided into E-type magnetic cores, and is made of, for example, rectangular ferrite, like the magnetic body 1 described above.

(1) Holding Step As shown in FIG. 3 (a), the direction parallel to the longitudinal direction of the holding table 13 with the longitudinal direction of the holding table 13 shown in FIG. 1 facing the cutting feed direction (X-axis direction). In this direction, the magnetic body 4 is placed on the holding surface 13a of the holding table 13, and the suction force of a suction source (not shown) is applied to the holding surface 13a to attract and hold the magnetic body 4 by the holding surface 13a.

(2) Groove formation step After the holding step, the holding table 13 holding the magnetic body 4 is cut and fed in the + X direction, for example, by the cutting feed means 20 shown in FIG. Move to the lower side of the cutting means 30A. In the second example, the first cutting blade 32 is made magnetic by the index feeding means 40A in order to form the cutting grooves on both outer sides (± Y direction side) of the central portion while leaving the central portion of the magnetic body 4. The first cutting means 30 </ b> A is moved above two positions to be cut into the body 4. The two positions refer to a position shifted by a predetermined distance in the + Y direction with respect to the central portion of the magnetic body 4 and a position shifted by a predetermined distance in the −Y direction with respect to the central portion of the magnetic body 4.

  When the first cutting blade 32 is positioned at a position shifted by a predetermined distance, for example, in the + Y direction side with respect to the central portion of the magnetic body 4 by the index feeding means 40A, the spindle 31 rotates, and the first cutting blade 32 is moved, for example, While rotating in the direction of arrow A, the first cutting blade 32 is cut and fed, for example, in the −Z direction with respect to the magnetic body 4 by the cutting feed means 50A shown in FIG. Then, the first cutting blade 32 is cut, the holding table 13 is cut and fed in, for example, the + X direction, and the first cutting blade 32 cuts the outer side (+ Y direction side) of the central portion of the magnetic body 4. A concave cutting groove 5 extending in the X-axis direction is formed.

  Subsequently, the index cutting means 40A positions the first cutting blade 32 at a position displaced by a predetermined distance, for example, in the −Y direction with respect to the central portion of the magnetic body 4, and performs the same groove forming operation as described above. The cutting blade 32 cuts 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 surface states of the bottom surfaces 5a and 6a of the cutting grooves 5 and 6 are rough, and the intersection (corner portion) between the bottom surfaces 5a and 6a of the cutting grooves 5 and 6 and the side surfaces connected thereto is, for example, an R shape. Is formed. And the convex part 7 extended in a X-axis direction is formed between the two cutting grooves 5 and 6 formed in this way.

(3) Groove shaping step After the groove forming step is performed, the second cutting blade 34 is positioned, for example, immediately above the cutting groove 5 by the index feeding means 40A shown in FIG. Thus, while the spindle 31 rotates and the second cutting blade 34 rotates, for example, in the direction of arrow A, the second cutting blade 34 is moved relative to the magnetic body 4 by the cutting feed means 50B shown in FIG. The second cutting blade 34 is cut and fed in the −Z direction to cut the second cutting blade 34 into the cutting groove 5, and the holding table 13 is cut and fed in the + X direction, for example, so that the second cutting blade 34 moves the bottom surface 5 a of the cutting groove 5. The shape of the bottom surface of the cutting groove 5 is shaped. Subsequently, after the second cutting blade 34 is positioned immediately above the cutting groove 6 by the index feeding means 40A shown in FIG. 1, the same shaping operation as described above is performed. The bottom surface 6a is shaved and the bottom surface shape of the cutting groove 6 is shaped. As a result, the bottom surfaces 5a and 6a of the cutting grooves 5 and 6 become flat and the corners of the R shape are removed, so that the bottom surface shape of the cutting grooves 5 and 6 is shaped into a desired state.

(4) Grinding step As shown in FIG. 3D, for example, the upper surface 7a of the convex portion 7 between the two cutting grooves 5 and 6 is ground using the second cutting means 30B. Specifically, the second cutting blade 34 is positioned immediately above the convex portion 7 of the magnetic body 4 by the index feeding means 40A shown in FIG. Thereafter, the spindle 31 rotates and the second cutting blade 34 is cut and fed to the magnetic body 4 in the −Z direction, for example, by the cutting feed means 50B while the second cutting blade 34 is rotated in the direction of arrow A, for example. Then, a predetermined amount of the upper surface 7a of the convex portion 7 is ground. Then, the holding table 13 is cut and fed, for example, in the + X direction, and the second cutting blade 34 cuts 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 has a desired E-shaped cross section while extending in the X-axis direction.

  Although the said grinding process demonstrated the case where it implemented after the groove shaping process, it is not limited to this, You may implement a grinding process before a groove shaping process after a groove formation process. Further, after performing the holding process, the grinding process may be performed, and then the groove forming process and the groove shaping process may be sequentially performed. When the grinding steps are performed in this order, a surface that is to be the upper surface 7a of the convex portion 7 between the two cutting grooves 5 and 6 formed in the subsequent groove forming step (the upper surface of the central portion of the magnetic body 4). Is ground with the first cutting blade 32 or the second cutting blade 34.

(5) Cutting step After all the steps described above are completed, the holding table 13 is rotated by, for example, 90 ° by the rotation support base 14 shown in FIG. The direction is in the Y-axis direction. The third cutting blade 30C is moved to a predetermined position where the third cutting blade 35 cuts the magnetic body 4 by the index feeding means 40B shown in FIG.

  Next, the spindle 31 rotates, and the third cutting blade 35 is rotated with respect to the magnetic body 4 by, for example, the cutting means 50C shown in FIG. Cutting in the Z direction and cutting the third cutting blade 35 in a direction perpendicular to the extending direction of the cutting grooves 5 and 6 (Y-axis direction), and cutting and feeding the holding table 13 in the + X direction, for example. Then, the magnetic body 4 is completely cut to be divided into E-type magnetic cores 8. The index feeding means 40B shown in FIG. 1 repeats the above-described cutting operation while indexing and feeding the third cutting means 30C at a predetermined interval, for example, in the −Y direction. The magnetic core 8 is manufactured.

  As described above, in the second example of the magnetic core manufacturing method, the first cutting blade 32 formed with a predetermined width is held at a predetermined cutting depth while the plate-like magnetic body 4 is held by the holding table 13. In the groove forming step of cutting into the magnetic body 4 and cutting and feeding in the cutting feed direction to form the two cutting grooves 5 and 6, the width is greater than the first cutting blade 32 and is harder than the first cutting blade 32 The second cutting blade 34 to be formed is cut into the cutting grooves 5 and 6 and cut and fed in the cutting feed direction to shape the bottom shape of the cutting grooves 5 and 6, and the two cutting grooves 5 and 6 The first cutting blade 32 or the second cutting blade 34 is used to grind the upper surface 7a of the convex portion 7 between them or the surface to be the upper surface 7a of the convex portion 7 between the two cutting grooves 5 and 6. A third cutting block is formed in the direction perpendicular to the grinding process and the extending direction of the cutting grooves 5 and 6. In order to perform the cutting process of cutting the cutting wire 35 and cutting and feeding the magnetic body 4 completely, a plurality of E-type magnetic cores 8 are formed from the magnetic body 4 extending in the cutting feed direction (X-axis direction). Can be obtained, and the production efficiency of the magnetic core 8 is improved.

1: Magnetic body 2: Cutting groove 3: Magnetic core 4: Magnetic body 5, 6: Cutting groove 7: Convex portion 8: Magnetic core 10: Cutting device 11: Device base 11a: Upper surface 12: Column 13: Holding table 13a: Holding surface 14: Rotating support base 20: Cutting feed means 21: Ball screw 22: Motor 23: Guide rail 24: Moving base 30A: First cutting means 30B: Second cutting means 30C: Third cutting means 31: Spindle 32: 1st cutting blade 33: Base 34: 2nd cutting blade 35: 3rd cutting blade 40A, 40B: Index feed means 41: Ball screw 42: Motor 43: Guide rail 44a, 44b: Moving plate 50A , 50B, 50C: Infeed means 51: Ball screw 52: Motor 53: Guide rail 54a, 54b: Lift plate

Claims (2)

A method of manufacturing a concave magnetic core made of a magnetic material,
A holding step of holding a plate-like magnetic body with a holding table;
A groove forming step in which a first cutting blade formed with a predetermined width is cut into a magnetic body held by the holding table at a predetermined cutting depth and cut in a cutting feed direction to form a cutting groove;
A second cutting blade, which is harder than the first cutting blade and formed with a width equal to or larger than the first cutting blade, is cut into the cutting groove and cut and fed in the cutting feed direction to form the bottom shape of the cutting groove. A groove shaping process for shaping;
A cutting step of cutting a third cutting blade in a direction orthogonal to the cutting groove and feeding the cut blade to completely cut the magnetic body. A method of manufacturing an E-type magnetic core made of a magnetic material,
A holding step of holding a plate-like magnetic body with a holding table;
A groove forming step in which a first cutting blade formed with a predetermined width is cut into a magnetic body held by a holding table at a predetermined cutting depth and cut into a cutting feed direction to form two cutting grooves;
A second cutting blade, which is harder than the first cutting blade and formed with a width equal to or larger than the first cutting blade, is cut into the two cutting grooves and cut and fed in a cutting feed direction, and the two cuttings are performed. A groove shaping step for shaping the bottom shape of the groove;
A grinding step of grinding an upper surface of a convex portion between the two cutting grooves or a surface to be the upper surface of the convex portion between the two cutting grooves;
A cutting step of cutting a third cutting blade in a direction orthogonal to the two cutting grooves and cutting and feeding in a cutting feed direction to completely cut the magnetic body.

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