JP4626738B2 - Method for manufacturing winding core for inductance element and method for manufacturing inductance element - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a core used for an inductance element and a method of manufacturing an inductance element, and more particularly to a method of manufacturing a core for an inductance element that can be applied to the manufacture of an ultra-small surface-mount type inductance element, and The present invention relates to a method for manufacturing an inductance element.
[0002]
[Prior art]
An inductance element is used as an indispensable element for electronic equipment. In recent years, electronic devices have been reduced in size and functionality, and accordingly, the degree of component integration of substrates used in electronic devices has increased.
[0003]
Each component is required to have a smaller component shape due to the higher integration of components on the board. For example, the inductance element currently has a 2520 size (2.5 mm × 2.0 mm area) as the mainstream, but recently it has a 2012 size (2.0 mm × 1.2 mm) and a 1608 size (1.6 mm × 0.2 mm). 8mm), the capacitor has begun to be marketed to 0505 size (0.5mm x 0.5mm). As described above, it is easily estimated that various parts including the inductance element are further reduced in size.
[0004]
In addition, the recent increase in interest in environmental problems has led to a reduction in power consumption of electronic devices. In order to reduce the power consumption of electronic devices, it is necessary to reduce the DC resistance of the components used, and the demand is increasing.
[0005]
[Problems to be solved by the invention]
A typical surface-mount type inductance element is a ceramic body such as ferrite, alumina, forsterite, etc., as described in JP-A-11-87126 shown in FIG. There is one in which a wire 2 is wound around a core body 1 and molded with a resin 3 to form a component exterior and an electrode 4 is applied.
[0006]
The core used in the surface-mount type inductance element shown in FIG. 10 has a circular cross section of the core part and a circular shape of the collar part. Such a method of manufacturing a core body is obtained by cutting the core portion after molding the core body that is the origin of the core body, or in the case of ceramics typified by ferrite, alumina, and forsterite, after the core is fired. Manufactured by cutting parts.
[0007]
The core body is cut by equipment having a structure as shown in FIGS. When the core body 10 is set in a cutting facility as shown in FIG. 11A, a cutting grindstone 21 that cuts the core 11 while rotating the core body 10 with a rotary wheel 20. Is applied to the base body 10, and the rotary wheel 20 or the grindstone 21 is pressed against the base body 10 and moved to a desired distance to provide the core portion 11 as shown in FIG. At that time, since the rotary wheel 20 rotates the base body 10, the core body base body 10 that contacts the rotary wheel 20 preferably has a cylindrical shape with a circular cross section. Oite the core member 1 after cutting, was not cut by the grindstone 21 parts to become the flange portion 12 of Makishintai 1, the flange portion cross-sectional shape is a circle. 11 to 13, the axial width of the rotary wheel 20 is larger than the width of the base body 10 and larger than the width of the cutting grindstone 21.
[0008]
Japanese Patent Laid-Open No. 8-97064 also describes a method and apparatus for grinding a central portion of a peripheral surface of a cylindrical element having a groove on the outer periphery to process it into a drum-shaped part. Since the supporting blade comes into contact with the collar part, a perfect circle cannot be obtained, and it cannot be processed into a drum-shaped part having a polygonal (atypical) collar part. That is, in the facility of FIG. 13, this corresponds to a configuration in which the element body portion to which the grindstone 21 does not hit is supported by the blade 22 that supports the element body 10 from below.
[0009]
In order to make the flange portion 12 of the core body 1 have a shape other than a circle, it is possible to make the core body body 10 before cutting into a shape other than a cylinder. Even if it is an elliptical cylinder or the like, the element body 10 can be rotated and cut as long as it is always in contact with the rotating wheel 20. However, when the element body 10 is rotated, the center of the element body cross section cannot be set as the rotation axis, and the cut cross-sectional shape of the core part 11 has extremely low roundness. Furthermore, a steady cross-sectional area cannot be obtained, and the center of the collar portion and the cross-sectional center of the core portion 11 are likely to be shifted. This is not preferable from the viewpoint of stabilizing the quality because the cross-sectional area of the core 11 is an element that affects the inductance.
[0010]
Moreover, since the shape of the collar part 12 of the core body 1 by the manufacturing method of FIG. 11 thru | or FIG. 13 is a normal circle (As mentioned above, quality cannot be stabilized except a circle), Therefore It uses conventionally for size reduction 10 is removed, and the electrode 4 is directly applied to the core body 1 to form a surface-mount type inductance element, the flange 12 serving as the substrate mounting surface cannot be contacted with the surface, and stable mounting is achieved. Cannot be performed, and the reliability of the device is lowered.
[0011]
Then, the method of manufacturing a core body by shaping | molding is proposed instead of the manufacturing method of the core body by the above-mentioned cutting as disclosed by the patent 3116513 shown in FIG. The manufacturing method of FIG. 14 is a method of manufacturing the core body 1 by using a mold that can form the core portion 11 and the flange portion 12 in advance so as to form the core body shape after molding. FIG. 14A is a general example of the core body 1 obtained by molding, and both the core portion 11 and the flange portion 12 are square, and FIGS. 14B and 14C show the core portion 11. This is an example in which the flange 12 is formed into a substantially octagonal shape. If it is the manufacturing method of FIG. 14, the shape of the core body collar part can also be manufactured even if it is a polygon, for example, a quadrangle. Moreover, since a cutting process is unnecessary, production is possible at low cost.
[0012]
However, in the case of the manufacturing method of FIG. 14, the cross-sectional shape of the core portion 11 of the core body 1 cannot be made into a circle due to the structural limitations of the molding die, It has a shape with a partial arc and flat part. When the cross-sectional shapes of the core body 1 are compared with the same cross-sectional area, the circle has the shortest turning distance. The short sectional distance with the same cross-sectional area means that the wire of the winding can be shortened, so that a low DC resistance can be realized with the same inductance. Low DC resistance leads to power saving. The winding core body 1 produced by the manufacturing method of FIG. 14 is suitable for constructing a surface-mount type inductance element that can be miniaturized, but is not preferable for power saving. Moreover, since the end surface 13 of the collar part 12 is shape | molded by the frame of a metal mold | die, it is difficult to form unevenness | corrugations, such as a groove | channel, in order to guide a wire to a side surface or to form an electrode easily.
[0013]
Accordingly, a core body having a polygonal shape, for example, a quadrangular collar portion, which is optimal for a surface-mount type inductance element capable of realizing miniaturization and power saving as shown in FIG. As disclosed in Japanese Patent Application Laid-Open Nos. 10-163033 and 10-172853, positioning irregularities are formed on the end 15 of the core body 10 shown in FIG. A portion 16 is provided, and this is used to cut as shown in FIGS. 15B and 15C, or as shown in FIGS. 15D to 15G, a side surface or an end surface is provided with a groove 17 or a groove 18, In order to fix the center position of the element body 10 by using these at the time of cutting, the element body 10 is cut while being fixed by a fixing jig, and the core part 11 is formed as shown in FIGS. 15 (C) and 15 (G). A method of forming has been proposed.
[0014]
If the manufacturing method of FIG. 15 is used, since the core part 11 is formed by cutting, a cross section can be made into a circle | round | yen, and the collar part 12 can be formed in shapes other than a circle | round | yen. However, in the manufacturing method of FIG. 15, it is indispensable to fix the core body 10 for positioning at the time of cutting, and it takes time to set the core for positioning. In addition, it is necessary to rotate the element body 10 at the time of cutting. However, it is necessary to apply a force for rotating the element body 10 from a positioning jig, and it is necessary to stop the operation of rotating the element body once at the time of positioning. Even when the force for rotating the element body is applied not from the positioning jig but from the side surface of the element body with the rotating wheel, the sectional shape of the element body is not a circle, so smooth rotation cannot be performed and productivity is improved. Has a problem.
[0015]
Therefore, in view of the above points, the present invention can reduce the DC resistance value by making the cross-sectional shape of the winding core portion a circle, shortening the wire length, and making the collar shape a flat surface suitable for surface mounting. It is an object of the present invention to provide a method for manufacturing a winding body for an inductance element and a method for manufacturing an inductance element that can be formed into a square shape or the like and can improve the stability when mounted on a substrate.
[0016]
Other objects and novel features of the present invention will be clarified in embodiments described later.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, a method of manufacturing an inductor core for an inductance element according to claim 1 of the present application is as follows.
Using a rotating wheel that gives a rotational force to the side surface of the element body to be the core body for the inductance element and a cutting grindstone that cuts the core portion, the cutting grindstone is addressed while rotating the element body, and cutting is performed. In forming the core part by processing,
The element body has a cross-sectional shape other than a circle or a polygonal shape, and a portion having a flat surface on the side surface has a shape that does not protrude from the end surface on both end surfaces in the axial direction of the cylindrical portion,
The contact width of the rotating wheel that contacts the element body is narrower than the contact width of the cutting grindstone that contacts the element body and is within the axial length range of the cylindrical portion, and is cut as the core portion. The element is shaped so that the rotating wheel contacts the part and supports the part with a blade, and has a cross-section other than a circle or a polygonal shape and a flange having a flat surface on both sides of the cylindrical core part. The body is cut with the cutting grindstone .
The method for manufacturing a core body for an inductance element according to the invention of claim 2 of the present application is the method according to claim 1, wherein the section having a cross section other than a circle or a polygon and having a flat surface on a side surface is the axial direction of the element body. It is characterized by being the both ends of.
[0020]
A manufacturing method of the surface mount type inductance element according to the invention of claim 3 is as follows:
Using a rotating wheel that gives a rotational force to the side surface of the element body to be the core body for the inductance element and a cutting grindstone that cuts the core portion, the cutting grindstone is addressed while rotating the element body, and cutting is performed. Forming the core part by processing to obtain a core body for an inductance element, winding a wire around the core part of the core body, and forming the wire end at the end of the core body A method for manufacturing a surface mount type inductance element connected to an electrode part , and when producing the winding core for the inductance element,
The element body has a cross-sectional shape other than a circle or a polygonal shape, and a portion having a flat surface on the side surface has a shape that does not protrude from the end surface on both end surfaces in the axial direction of the cylindrical portion,
The contact width of the rotating wheel that contacts the element body is narrower than the contact width of the cutting grindstone that contacts the element body, and is within the length range in the axial direction of the cylindrical portion, and the portion that is cut as the core portion The element body has a shape in which the rotating wheel is in contact with and supports the portion with a blade, and has a cross section other than a circle or a polygonal shape and a flange having a flat surface on both sides of the cylindrical core portion. Is cut with the cutting grindstone .
The method of manufacturing a surface-mount type inductance element according to the invention of claim 4 is the method according to claim 3, wherein the section having a cross section other than a circle or a polygon and having a flat surface on a side surface is in the axial direction of the element body. It is characterized by being both ends.
[0021]
The method for manufacturing a surface-mount type inductance element according to the invention of claim 5 is characterized in that, in claim 3 or 4, after the wire winding, a resin is provided on the core part to cover the core part. It is said.
[0022]
According to a sixth aspect of the present invention, there is provided a method for manufacturing a surface-mount type inductance element according to the fifth aspect, wherein the resin contains magnetic powder.
[0023]
A manufacturing method of a surface mount type inductance element according to the invention of claim 7 is characterized in that in any one of claims 3 to 6 , a magnetic material is disposed on the core after the wire winding.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a method for manufacturing an inductor core for inductance element and a method for manufacturing an inductance element according to the present invention will be described with reference to the drawings.
[0025]
A method for manufacturing an inductor core for an inductance element according to the first embodiment of the present invention will be described with reference to FIGS. In these drawings, the manufacturing facility for the inductance element core body is formed by cutting the rotating wheel 30 for applying a rotational force to the side surface of the element body 10 to be the inductance element core body 1 and the core portion 11. A cutting grindstone 31 for cutting, a blade 32 for supporting the element body 10 from below, and a stopper 33 for restricting the axial position of the element body 10 as shown in FIG.
[0026]
Here, the cutting grindstone 31 is a disk-shaped rotary grindstone, and the outer peripheral portion thereof is a grinding peripheral surface provided with abrasive grains such as diamond. This grinding peripheral surface width substantially matches the width of the core part 11 formed in the element body 10 to be cut. The element body 10 is mainly made of ceramics such as ferrite, alumina, and forsterite. Further, the contact width in the axial direction of the rotating wheel 30 that contacts the element body 10 is made narrower than the contact width of the cutting grindstone 31 that contacts the element body 10, and the rotating wheel is formed on the portion to be cut as the winding core portion 11. 30 is in contact and the part is supported from below by a blade 32 as shown in FIG. As shown in FIG. 3, the upper side of the blade 32 is inclined so that the rotary wheel 30 side is low and the grindstone 31 side is high.
[0027]
And the base body 10 which should become a winding core body is installed in the said manufacturing equipment which has the rotary wheel 30 and the grindstone 31 for cutting. At this time, it is important that the contact portion between the rotary wheel 30 and the element body 10 is in a plane where the cutting grindstone 31 and the element body 10 are in contact. That is, the rotating wheel 30 needs to be in contact with the surface (circumferential surface) cut by the cutting grindstone 31. In the cutting, the cylindrical core 11 is formed by moving the rotating wheel 30 or the cutting grindstone 31 while cutting it to a distance corresponding to the cross-sectional diameter of the desired core 11. At this time, both sides (portions that become the ridges) of the portion to be cut by contact with the grindstone 31 of the element body 10 can take any shape because neither the rotating wheel 30 nor the grindstone 31 are in contact. Therefore, by setting the cross-sections of the portions serving as the wrinkles on both sides of the element body 10 to be other than a circle or a polygon, a wrinkle having a non-circular or polygonal cross-sectional shape can be obtained.
[0028]
4 and 5 are shape diagrams comparing the pre-cutting element body to be the core body and the obtained core body. If the element body of FIG. 4 (A) is used, the rectangular plate-like parts 42 to be the square flanges 42 on both sides of the element body are left, and the intermediate cylinder part 43 is cut into a small-diameter columnar shape (A ′). It is possible to make the winding core portion 11 into a cylindrical winding core body 40 having the rectangular flange portion 42. The same applies to FIGS. 4B, 4B, 4C, and 4C, and the winding wire drawing grooves 42a and 42b are formed in the rectangular flange 42. 4 (A), different from (A ′).
[0029]
5A and 5A show an example in which the collar portion 44 is a hexagonal shape, FIGS. 5B and 5B show an example in which the collar portion 45 has a cross shape, and FIGS. ) Is an example of a substantially rhombus shape in which each side of the collar portion 46 includes an arc. In these FIG.4 and FIG.5, in order to make an electrode formation preferable, the uneven | corrugated | grooved part, the groove | channel where a wire passes may be provided.
[0030]
According to the embodiment of the method for manufacturing the inductor core for inductance element, the following effects can be obtained.
[0031]
(1) Since the cross section of the portion (for example, the cylindrical portion 43 in FIG. 4A) that becomes the core portion 11 of the core body 10 is a circle, the rotating wheel 30 is placed on the side surface of the core body 10. It is possible to smoothly rotate the element body 10 by bringing them into contact with each other, and the portion where the rotating wheel 30 contacts is always cut with a cutting grindstone 31 having a contact area wider in the axial direction than the contact area of the rotating wheel 30. Therefore, it is possible to smoothly rotate the element body 10 by the force of the rotating wheel 30 while maintaining a circle at the contact portion of the rotating wheel 30 until the end of cutting. Therefore, it is possible to manufacture with high productivity a core body in which the cross-sectional shape of the core portion 11 is a circle and the shape of the flange portion is a non-circular or polygonal shape having a flat surface suitable for surface mounting. Can be made smaller and the DC resistance value can be reduced, and the stability when mounted on the substrate can be improved.
[0032]
(2) In the conventional manufacturing method (FIG. 11), when the cutting is advanced, two portions of the end portion of the element body 10 which is not cut are brought into contact with the rotating wheel, and the cutting portion which is the central portion where the cutting grindstone is installed While force by a grindstone was applied at one place and the cutting portion became thinner as the cutting progressed, it was easy to break. In the case of the manufacturing method described in the present embodiment, even if cutting progresses, the rotating wheel 30 and the base body 10 are applied with force at one place, the cutting grindstone 31 and the base body 10 are applied with one place, and further, the rotating wheel 30 and the grinding wheel are applied. Since 31 is in the same position as seen from the direction of the element body axis, it is difficult to generate a force for folding the element body. In particular, the problem of the occurrence of this crease cannot be ignored as the size of the element body becomes smaller due to recent miniaturization. However, according to the manufacturing method according to the present embodiment, this problem may occur even if miniaturization proceeds in the future. Can be eliminated.
[0033]
(3) Since the element body portion that remains without being cut by the cutting grindstone 31 becomes a flange portion of the core body 1, the cross section of the portion is made into a shape other than a circle as shown in FIGS. In addition, it is possible to manufacture the core body 1 having a circular cross section of the core part 11 and having various flanges.
[0034]
(4) When the core part 11 of the core body has a circular cross section and a wire is wound around the core part 11 to produce an inductance element, downsizing and power saving can be realized.
[0035]
Next, a method for manufacturing an inductance element according to the second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 6 (A), the winding core 1 obtained by the manufacturing method of the first embodiment is used, and the wire 2 is wound around the winding core portion 11, and the rectangular irons on both sides of the winding core portion 11 are used. The end portion of the wire 2 is connected to the electrode portion 14 provided on the end face of the portion 12 by soldering or the like to constitute a surface mount type inductance element. Then, when mounted on the board, it is placed on the board 50 as shown in FIG.
[0036]
Thus, when the collar portion 12 is square, the flat surface can be fixed (horizontal) when mounted on the board, reliability during mounting can be ensured, and the component exterior as shown in FIG. You can also
[0037]
FIG. 7 shows a third embodiment of the present invention. In the second embodiment, the electrode portions are provided on both flange end faces, but two or more electrode portions are provided on the same end face of the flange 12. The case where it applies is shown. In the example shown in FIG. 7A, two electrode portions 14a and 14b are formed on one flange portion 12, and the ends of the wire 2 wound around the core portion 11 are connected to the electrode portions 14a and 14b, respectively. The Other configurations may be the same as those of the second embodiment.
[0038]
In the case of the second embodiment described above, the mounting on the substrate is horizontal as shown in FIG. 6B, but in the case of the third embodiment in FIG. As shown, it can be placed vertically on the substrate 50.
[0039]
If two or more windings are applied to the same winding core, it is possible to configure a surface mount type inductance element that can be used for applications such as a common mode choke coil and a balun transformer.
[0040]
FIG. 8 shows a fourth embodiment of the present invention. In the configuration of FIG. 6, a groove 25 serving as a guide for pulling out the wire 2 is formed in the flange portion 12 of the core body 1 in advance.
Other configurations are the same as those in FIG.
[0041]
In the fourth embodiment, the wire 2 can be easily pulled out by providing the groove portion 25 in the flange portion 12 so as to serve as a guide for pulling out the wire. Furthermore, when the surface from which the wire 2 is drawn out contacts the substrate bonding surface, and there is no groove 25, a gap is generated between the surface mount type inductance element and the substrate by the diameter of the wire 2 and the stability may deteriorate. It is presumed that it is preferable to pull out the wire 2 into the groove 25. The shape, size, position, and number of the groove portions 25 are not particularly limited as long as an equivalent effect can be obtained in actual use.
[0042]
9A, 9B, and 9C show fifth, sixth, and seventh embodiments of the present invention, and the wire 2 is attached to the core portion 11 of the core body 1 as shown in FIG. FIG. 4 is a schematic view of a surface-mount type inductance element that is wound and connected to an electrode 14 on the end face of the flange 12 and then coated with a resin 26.
[0043]
In the fifth embodiment shown in FIG. 9A, since the resin 26 is applied around the core part 11 and the wire 2 wound around the core part 11 is protected by the resin coating, the reliability is improved.
[0044]
Further, since the resin 28 containing the magnetic powder 27 as shown in the sixth embodiment in FIG. 9B is used, the magnetic circuit is close to a closed magnetic path, so that the same shape and the same winding are obtained. Inductance increases with the number of wires, and there is a possibility of further miniaturization. Accordingly, the length of the wire 2 can be shortened due to the decrease in the number of windings, which leads to power saving.
[0045]
In the seventh embodiment shown in FIG. 9C, after winding the wire 2 around the core part 11 of the core body 1, the magnetic piece 29 is arranged around the core part 11 and the resin 26 is provided. Thus, an inductance element was produced. Compared with the resin 28 containing the magnetic powder 27 of the sixth embodiment, since the solid magnetic piece 29 is installed (embedded) in the resin 26, it is closer to the closed magnetic path and can be further reduced in size. Leads to energy and power saving.
[0046]
The material of the core used in the present invention is mainly ceramics such as ferrite, alumina, and forsterite, but is not particularly limited.
[0047]
The core body shape is not particularly limited as long as it is produced by the cutting method of the present invention. Also, there are no particular restrictions on the constituent parts such as the electrode material, wire material, resin material, magnetic material, electrode shape, etc. used for the surface mount type inductance element.
[0048]
Although the embodiments of the present invention have been described above, it will be obvious to those skilled in the art that the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims.
[0049]
【The invention's effect】
As described above, according to the present invention, it is possible to manufacture a wound core body that can be reduced in size and power consumption as a surface-mount inductance element. By providing a surface-mount inductance element using this, an electronic It becomes possible to reduce the size and power consumption of the device.
[Brief description of the drawings]
FIG. 1 shows an outline of equipment used in a method for manufacturing a core body for an inductance element according to a first embodiment of the present invention, and FIG. 1 (A) is a perspective view when the core body is cut from now on. , (B) is a perspective view of a state in which the core body is cut.
FIG. 2 is a schematic plan view of equipment used in the first embodiment of the present invention.
FIG. 3 is a schematic front view of equipment used in the first embodiment of the present invention.
FIG. 4 is a perspective view showing an example of a core body before cutting of a core body that can be used in the first embodiment and an example of a core body obtained therefrom.
FIG. 5 is a perspective view showing another example of the core body before cutting of the core body that can be used in the first embodiment and a core body obtained therefrom.
6A and 6B show a manufacturing method of an inductance element using a winding core for an inductance element according to a second embodiment of the present invention, where FIG. 6A is a perspective view, and FIG. 6B is a front view when mounted on a substrate. It is.
FIGS. 7A and 7B show a manufacturing method of an inductance element using a winding core for an inductance element according to a third embodiment of the present invention, where FIG. 7A is a perspective view and FIG. 7B is a front view when mounted on a substrate; It is.
FIG. 8 is a perspective view showing a method of manufacturing an inductance element according to a fourth embodiment of the present invention and using an inductance element core.
FIG. 9 is a front cross-sectional view showing fifth, sixth and seventh embodiments of the present invention.
FIG. 10 is a perspective view of a conventional surface mount type inductance element.
11A and 11B show an outline of equipment used in a conventional method of manufacturing a core body, in which FIG. 11A is a perspective view when the core body is cut from now on, and FIG. FIG.
FIG. 12 is a schematic plan view of the same.
FIG. 13 is a schematic front view of the same.
14A is a perspective view showing a typical example of a core body formed by molding, and FIG. 14B is a perspective view showing a general example of the core body formed by molding; FIG. The front view which shows an example, (C) is a core part sectional drawing of the core body of (B).
FIGS. 15A and 15B show another example of a core body of a conventional surface mount type inductance element, wherein FIGS. 15A to 11C are explanatory views of an example in which positioning uneven portions are provided at the ends, and FIGS. (G) is explanatory drawing of the example which provided the groove | channel for fixation in the side surface or the end surface.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Core body 2 Wire 3,26,28 Resin 4,14 Electrode part 10 Core body 11 Core part 12,42,44,45,46 ridge part 17,42a, 42b Groove 20,30 Rotating wheel 21 , 31 Cutting wheel 22, 32 Blade 27 Magnetic powder 29 Magnetic body piece

Claims (7)

Using a rotating wheel that gives a rotational force to the side surface of the element body to be the core body for the inductance element and a cutting grindstone that cuts the core portion, the cutting grindstone is addressed while rotating the element body, and cutting is performed. In the manufacturing method of the core body for an inductance element that forms the core portion by processing,
The element body has a cross-sectional shape other than a circle or a polygonal shape, and a portion having a flat surface on the side surface has a shape that does not protrude from the end surface on both end surfaces in the axial direction of the cylindrical portion,
The contact width of the rotating wheel that contacts the element body is narrower than the contact width of the cutting grindstone that contacts the element body and is within the axial length range of the cylindrical portion, and is cut as the core portion. The element is shaped so that the rotating wheel contacts the part and supports the part with a blade, and has a cross-section other than a circle or a polygonal shape and a flange having a flat surface on both sides of the cylindrical core part. A method of manufacturing a core body for an inductance element , wherein the body is cut with the cutting grindstone . The method for manufacturing a core body for an inductance element according to claim 1, wherein the portion having a cross-section other than a circle or a polygon and having a flat surface on a side surface is both ends in the axial direction of the element body. Using a rotating wheel that gives a rotational force to the side surface of the element body to be the core body for the inductance element and a cutting grindstone that cuts the core portion, the cutting grindstone is addressed while rotating the element body, and cutting is performed. Forming the core part by processing to obtain a core body for an inductance element, winding a wire around the core part of the core body, and forming the wire end at the end of the core body A method for manufacturing a surface mount type inductance element connected to an electrode part , and when producing the winding core for the inductance element,
The element body has a cross-sectional shape other than a circle or a polygonal shape, and a portion having a flat surface on the side surface has a shape that does not protrude from the end surface on both end surfaces in the axial direction of the cylindrical portion,
The contact width of the rotating wheel that contacts the element body is narrower than the contact width of the cutting grindstone that contacts the element body, and is within the length range in the axial direction of the cylindrical portion, and the portion that is cut as the core portion The element body has a shape in which the rotating wheel is in contact with and supports the portion with a blade, and has a cross section other than a circle or a polygonal shape and a flange having a flat surface on both sides of the cylindrical core portion. Is cut with the cutting grindstone . A method for manufacturing a surface mount inductance element. 4. The method for manufacturing a surface-mounted inductance element according to claim 3, wherein the portion having a cross-section other than a circle or a polygon and having a flat surface on the side surface is both ends of the element body in the axial direction. The method for manufacturing a surface-mount type inductance element according to claim 3 or 4, wherein after the wire winding, a resin is provided on the core portion to cover the core portion.   The method for manufacturing a surface-mount type inductance element according to claim 5, wherein magnetic powder is contained in the resin. The method for manufacturing a surface-mount type inductance element according to any one of claims 3 to 6 , wherein a magnetic material is disposed on the core after the wire winding.

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