JP2016163018A - Method of manufacturing square-shaped core and jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a square-shaped core of less deformation distortion with a small number of man-hour.SOLUTION: A method of manufacturing a square-shaped core includes step (a) of obtaining an element 2 having a shape of hollow elliptic cylinder, by using a first jig 1 having a shape of cylindroid, step (b) of removing the first jig 1 from the hollow section of the element 2, step (c) for inserting the square pole portion of a second jig 3 having a quadrangular shape at least partially into the hollow section of the element 2, and step (d) of obtaining a square-shaped core 38, by deforming the square pole portion of the second jig 3 inserted into the hollow section into a predetermined shape, thereby deforming the element 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing a magnetic core, and more particularly to a method for manufacturing a rectangular magnetic core.

  As a method of manufacturing a rectangular magnetic core made of an Fe-based amorphous soft magnetic alloy (hereinafter referred to as Fe-based amorphous), a method of cutting the material into strips and laminating each layer into a rectangular shape, cutting There is a method of forming a toroidal magnetic core by layering materials one layer at a time and then transforming it into a square shape.

  In Patent Document 1, as shown in FIG. 6, a method is described in which a material is cut into strips and laminated one by one in a square shape.

  Patent Document 2 describes a method of manufacturing a toroidal magnetic core by laminating cut layers one by one, and then transforming the toroidal magnetic core into a square shape as shown in FIG. Yes.

  In Patent Document 3, winding is performed by providing a reinforcing frame having a thickness greater than that of the thin ribbon on the outer peripheral surface and the inner peripheral surface of a circular wound core body formed by winding a thin ribbon made of an amorphous magnetic alloy. It is described that an iron core body is formed into a rectangular shape to obtain a wound core.

  Patent Document 4 discloses a transformer formed by forming an annular core element formed by winding a band-shaped silicon steel band into a rectangular shape by a forming jig inserted into an annular window hole inside the element. On the outer peripheral surface of the transformer core molded into a rectangular shape, a pressing plate formed with a length corresponding to the positions of the corner posts of the forming jig arranged at the four corners of the window hole of the transformer core Are respectively disposed on the leg portion and the yoke portion, and the respective pressing plates are fastened to the outer periphery of the transformer core by fastening bands so as to maintain the rectangular state of the transformer core. Yes.

Japanese Patent Laid-Open No. 06-140269, FIG. Japanese Patent Laying-Open No. 2004-253677, FIG. Japanese Patent Laid-Open No. 05-347219, FIGS. 4 and 5 Japanese Patent Laid-Open No. 2002-289441, FIG.

  The methods described in Patent Documents 1 and 2 are methods for forming a magnetic core by laminating plate materials. In these methods, for the convenience of laminating a large number of plate materials, a step of cutting the plate materials and a step of temporarily fastening the laminated plate materials for each layer are required. For this reason, man-hours are many and the manufacturing has taken a long time.

  In the methods described in Patent Documents 3 and 4, a cylindrical element body is formed by concentrically winding a metal ribbon, and then a force is applied from the inside and outside of the cylinder, so that the cylinder is converted into a rectangular cylinder. It will be transformed into. Since the element body is formed by winding the ribbon, the number of man-hours can be reduced as compared with the case where a large number of plate members are laminated. However, in particular, when the ribbon is long, a gap is likely to occur between the ribbons that overlap each other in the process of continuous winding. For this reason, deformation distortion tends to occur in the process of deforming the cylindrical element into a rectangular cylinder.

  The present invention has been made in view of the above, and the problem to be solved by the present invention is to provide a method of manufacturing a square magnetic core having a small deformation strain with a small number of man-hours.

  In order to solve the above-mentioned problem, the present invention has, as one aspect thereof, a step of obtaining an element body having a hollow elliptical column shape by using a first jig having an elliptical column shape at least partially. Removing the first jig from the hollow of the element body, inserting the quadrangular prism portion of the second jig having at least a part of the quadrangular prism shape into the hollow of the element body, A step of deforming the quadrangular column portion of the second jig inserted into the shape into a predetermined shape and deforming the element body in accordance with the deformation, thereby obtaining a square magnetic core. A method for manufacturing a rectangular magnetic core is provided.

  An element body may be obtained by continuously winding a thin ribbon made of metal around at least two rounds around the elliptical columnar shape of the first jig.

  The second jig includes a first inner frame and a second inner frame, and by moving the first inner frame and the second inner frame in different directions as viewed from the axial direction of the quadrangular prism, The element body may be deformed.

  By inserting a fourth jig between the first inner frame and the second inner frame from the axial direction of the quadrangular prism, and pushing between the first inner frame and the second inner frame. The first inner frame and the second inner frame may be moved in different directions.

  The section of the second jig is inscribed in relation to the ellipse of the section of the first jig, the length of the long side of the second jig is E, and the long side of the second jig The height of the arc of the cross section of the first jig connecting both ends of the long side of the second jig when viewed from F is F, the length of the short side of the second jig is G, 0.08 ≦ F / E ≦ when the height of the arc of the cross section of the first jig connecting both ends of the short side of the second jig when viewed from the short side of the jig 2 is 0.08 ≦ F / E ≦ 0.17 and 0.08 ≦ H / G ≦ 0.17 are satisfied, or 0.12 ≦ F / E ≦ 0.17 and 0.06 ≦ H / G ≦ 0. It is preferable that the condition 17 is satisfied.

  Moreover, as another aspect of the present invention, a first jig having at least a part of an elliptical column shape for winding a ribbon is wound around the elliptical column of the first jig. When the space corresponding to the elliptical cylinder after the first jig is removed from the element body is called a hollow portion, the space can be expanded from a size that can be inserted into the hollow portion to a predetermined size. A jig including a second jig having a rectangular cross section is provided.

  Further, as another aspect of the present invention, using a first jig having an elliptic cylinder shape at least in part, a step of obtaining an element body having a hollow elliptic cylinder shape, and from the hollow of the element body Removing the first jig, inserting the quadrangular column portion of the second jig having at least a portion of a quadrangular prism shape into the hollow of the element body, and inserting the hollow into the hollow, The method of manufacturing a rectangular magnetic core includes a step of deforming a quadrangular prism portion of the jig to a predetermined shape and obtaining a rectangular magnetic core by deforming the element body in accordance with the deformation. The section of the second jig is inscribed in relation to the ellipse of the section of the first jig, the length of the long side of the second jig is E, and the length of the second jig is The height of the arc of the cross section of the first jig connecting both ends of the long side of the second jig 3 when viewed from the side is F, and the length of the short side of the second jig is G. When the height of the arc of the cross section of the first jig connecting both ends of the short side of the second jig when viewed from the short side of the second jig is 0.08 ≦ F / E ≦ 0.17 and 0.08 ≦ H / G ≦ 0.17 are satisfied, or 0.12 ≦ F / E ≦ 0.17 and 0.06 ≦ H / G ≦ Provided is a rectangular magnetic core manufactured by a method of manufacturing a rectangular magnetic core that satisfies the condition of 0.17.

  According to the present invention, a rectangular magnetic core is manufactured by deforming into a hollow quadrangular prism shape starting from an element having a hollow elliptic cylinder shape or an elliptic cylinder shape. For this reason, it can deform | transform easily compared with the case where the toroidal which is a hollow cylindrical shape or the cylindrical shape of a cylinder is used as the starting point. As a result, a rectangular magnetic core having a small deformation strain and a high space factor can be manufactured with a small number of man-hours.

It is a figure for demonstrating the manufacturing method of the square-shaped magnetic core which is one embodiment of this invention. 3 is a plan view of the second jig 3 for explaining the structure and operation of the second jig 3. FIG. It is a side view of the 2nd jig | tool 3 for demonstrating operation | movement of the inner frames 31 and 32 when pushing in the center stick | rod 33. FIG. It is a figure for demonstrating the relationship of the size of the square-shaped part 41 used as the reference | standard at the time of setting the shape and size of the 1st jig | tool 1, and the 1st jig | tool 1. FIG. It is a figure for demonstrating the relationship of the size of the 1st jig | tool 1 and the 2nd jig | tool 3. FIG. It is a figure for demonstrating the manufacturing method of the square-shaped magnetic core described in patent document 1. FIG. It is a figure for demonstrating the manufacturing method of the square-shaped magnetic core described in patent document 2. FIG.

  A method for manufacturing a rectangular magnetic core according to an embodiment of the present invention will be described with reference to FIG.

  First, an element body 2 is obtained using a first jig 1 as shown in FIG. The first jig 1 is a jig having at least a part of an outer shape of an elliptical column or a substantially elliptical column. FIG. 1 (a) shows an outer shape having a substantially elliptic cylinder shape. A first jig 1 in FIG. 1A includes a pair of semi-elliptical columns 11, a coupling jig 12 that couples the pair of semi-elliptical columns 11 to each other, and a coupling jig 12 and a pair of semi-elliptical columns 11. A screw 13 for connection is provided. The connecting jig 12 connects the pair of semi-elliptical pillars 11 with a gap 14 formed between them.

  The element body 2 is formed by winding a metal ribbon around the first jig 1. The element body 2 may be formed by concentrically laminating a plurality of ribbons around the first jig 1. Alternatively, the element body 2 may be formed by continuously winding a long thin ribbon around the first jig 1 two or more times. In any case, the element body 2 has a hollow elliptic cylinder or a cylindrical shape of an elliptic cylinder. FIG. 1A shows a state in which the first jig 1 and the element body 2 are viewed with the axial direction of the hollow elliptical column as the line-of-sight direction. The same applies to the line-of-sight directions in FIGS. Hereinafter, the axial direction of the element body 2 is sometimes referred to as the vertical direction, and the direction along a plane perpendicular to the vertical direction is sometimes referred to as the horizontal direction. Through the subsequent steps, the target rectangular magnetic core is manufactured based on the element body 2.

  Next, as shown in FIG. 1B, the first jig 1 is extracted from the hollow portion 21 of the element body 2. In the case of the first jig 1 illustrated in FIG. 1A, when the screw 13 is loosened and the connecting jig 12 is removed from the pair of semi-elliptical columns 11, the pair of semi-elliptical columns 11 is provided by the gap 14. Since a space is generated between the element body 2, the first jig 1 is extracted from the element body 2 using this space.

  Next, as shown in FIG. 1C, the second jig 3 is inserted into the hollow portion 21 of the element body 2. Here, the second jig 3 will be described with reference to FIG. The second jig 3 is a jig having at least a part of a quadrangular prism or a substantially quadrangular prism. In FIG. 1 (c), the one having a substantially quadrangular prism shape in which the corners of the four corners of the quadrangular prism section are rounded is described. The second jig 3 includes inner frames 31 and 32 and a center bar 33. The inner frames 31 and 32 are provided with grooves 34 into which the center rod 33 is fitted. As shown in FIG. 3, the groove 34 is provided with an inner frame inclined portion 35. On the other hand, center rod inclined portions 36 are provided at both ends of the center rod 33, respectively. As can be seen from FIG. 3, the inner frame inclined portion 35 and the center rod inclined portion 36 have inclinations corresponding to each other.

  The operation of the second jig 3 will be described. First, as shown in FIG. 2A, the inner frames 31 and 32 are arranged at positions closest to each other. As shown in FIG. 3A, the center bar 33 is arranged in the groove 34 so that the inner frame inclined part 35 and the center bar inclined part 36 face each other. FIG. 1C shows a state where the second jig 3 in which the inner frames 31 and 32 and the center rod 33 are in such a positional relationship is inserted into the hollow portion 21 of the element body 2.

  Next, the center bar 33 is pushed downward in the drawing of FIG. As a method of pushing in the center bar 33, for example, a hole 37 is provided in the center bar 33, a screw (not shown) is passed through the hole, and the same is fastened to a screw hole (not shown). The screw holes at that time may be provided in the inner frames 31 and 32, or may be provided in a work table (not shown) or the like.

  Then, the inner frame 31 and the inner frame 32 move in opposite directions while the inner frame inclined portion 35 and the center rod inclined portion 36 slide, and the states as shown in FIGS. 2B and 3B. To. The central bar 33 pushed into the groove 34 functions as a wedge with respect to the inner frames 31 and 32. At this time, the 2nd jig | tool 3 will be in the state which extended | stretched the substantially square which is the cross section of the substantially square pole to the long side direction.

  In this way, the operation of separating the inner frames 31 and 32 from each other by pushing the center rod 33 is performed in a state in which the second jig 3 is inserted into the hollow portion 21 of the element body 2 as shown in FIG. To do. Then, the inner frames 31 and 32 are separated from each other, and the second jig 3 is deformed. With this deformation, the element body 2 is deformed to have the shape of the square magnetic core 38 as shown in FIG. The element body 2 after deformation, that is, the rectangular magnetic core 38 is shown in FIG.

  Finally, as shown in FIG. 1 (e), outer frames 39 and 40 are disposed outside the rectangular magnetic core 38. Thereby, the shape of the rectangular magnetic core 38 is maintained.

  Next, the shape of the first jig 1 will be described with reference to FIG. In order to improve the characteristics of the rectangular magnetic core 38 as a magnetic core, it is desirable that the strip has a high space factor. Further, in the present invention, since the starting point when deforming into a quadrangular prism shape (square magnetic core 38) is an elliptical column shape (element body 2), the effect of facilitating the deformation is obtained. The effect obtained when approaching a toroidal shape, that is, a hollow cylindrical shape, decreases. Considering such circumstances, the first jig 1 has a preferable shape and size.

  In this regard, the inventors obtained Table 1 as an example of the results of repeated studies. B / A and D / C in Table 1 indicate the ratios of lengths A, B, C, and D shown in FIG.

  A square part indicated by reference numeral 41 in FIG. 4 is a cross section of the square jig used as a reference when setting the shape and size of the cross section of the first jig 1. As described above, the first jig 1 has an elliptical column or a substantially elliptical column as a portion for winding the ribbon to form at least the element body 2. As shown in FIG. 4, the shape and size of the elliptical column or substantially elliptical column portion of the first jig 1 are in a rectangular shape inscribed in the cross section of the elliptical column or substantially elliptical column portion of the first jig 1. The unit 41 is set as a reference. The length A indicates the length of the long side of the square portion 41. The length B is the height of an elliptical arc connecting both ends of the long side of the square part 41 when viewed from the long side of the square part 41. This elliptical arc corresponds to the arc drawn by the cross section of the first jig 1. The length C indicates the length of the short side of the square portion 41. The length D is the height of an elliptical arc connecting both ends of the short side of the square part 41 when viewed from the short side of the square part 41. This elliptical arc also corresponds to the arc drawn by the cross section of the first jig 1.

As a result of the examination, in order to obtain the element body 2 in which the space factor of the ribbon is 80% or more and can be easily deformed into the rectangular magnetic core 38 having a quadrangular prism shape, the ribbon is When Fe-based amorphous, the thickness is preferably 10 μm or more and 100 μm or less, and more preferably 50 μm or less. Moreover, it turned out that it is preferable to satisfy the following conditions 1 or 2.
Condition 1: 0.08 ≦ B / A ≦ 0.17 and 0.08 ≦ D / C ≦ 0.17
Condition 2: 0.12 ≦ B / A ≦ 0.17 and 0.06 ≦ D / C ≦ 0.17
When the upper limit is further increased, the element body 2 approaches a toroidal shape.

  Next, the second jig 3 will be described. The 2nd jig | tool 3 is stored in the hollow part 21 of the element | base_body 2 before a deformation | transformation, as shown in FIG.1 (c). For this reason, when at least the inner frames 31 and 32 are brought closest to each other, they must be inscribed in the hollow portion 21 or have a smaller cross section than the hollow portion 21. In any case, the second jig 3 is inscribed in the hollow portion 21 immediately before the deformation of the element body 2 is started. The state at this time is shown in FIG. As can be seen from the figure, the cross section of the second jig 3 that is inscribed in the hollow portion 21 is also inscribed in the ellipse of the cross section of the first jig 1.

  As can be seen by comparing FIG. 4 and FIG. 5, the size of the second jig 3 when inscribed in the hollow portion 21, that is, the ellipse of the cross section of the first jig 1 is The size of the second jig 3 when the cross section of the second jig 3 is inscribed coincides with the size of the square portion 41 used as a reference when setting the size of the first jig 1. For this reason, the condition for obtaining the element body 2 that has a strip space factor of 80% or more and can be easily deformed into the rectangular magnetic core 38 having a quadrangular prism shape is the above-described condition. Similar to 1 and 2.

That is, suitable conditions between the first jig 1 and the second jig 3 are as follows. Let E be the length of the long side of the second jig 3 when inscribed in the hollow portion 21. Let F be the height of an arc connecting both ends of the long side of the second jig 3 when viewed from the long side of the second jig 3 when inscribed in the hollow portion 21. Let G be the length of the short side of the second jig 3 when inscribed in the hollow portion 21. A height H of an arc connecting both ends of the short side of the second jig 3 when viewed from the short side of the second jig 3 when inscribed in the hollow portion 21. At this time, it is preferable that the following condition 3 or 4 is satisfied.
Condition 3: 0.08 ≦ F / E ≦ 0.17 and 0.08 ≦ H / G ≦ 0.17
Condition 4: 0.12 ≦ F / E ≦ 0.17 and 0.06 ≦ H / G ≦ 0.17

  In the above, the manufacturing method of the square magnetic core which is one embodiment of this invention was demonstrated. According to the present embodiment, the following effects can be obtained.

The element body 2 serving as a starting point for deformation into a rectangular magnetic core has a hollow elliptical column shape or a cylindrical shape of an elliptical column. For this reason, compared with the case where the toroidal which is a hollow cylindrical shape or the cylindrical shape of a cylinder is used as a starting point, the deformation | transformation to a square-shaped magnetic core is easy, and generation | occurrence | production of a deformation | transformation distortion can be suppressed.
-Since the 1st jig | tool 1 has an elliptic cylinder thru | or a substantially elliptic cylinder shape, it is possible to wind in a thin strip without gap. This contributes to an improvement in the space factor, that is, the ratio of the ribbon occupying the cross section of the rectangular magnetic core.
In particular, when a long thin ribbon is continuously wound around the first jig 1, a material constituting the element body or the rectangular magnetic core is cut, for example, a step of cutting the thin ribbon into a strip shape in advance. There is no need to provide a process.
・ Similarly, when a long thin ribbon is continuously wound around the first jig 1, it is necessary to provide a temporary fixing step which is necessary when a plurality of plate members are stacked to form an element body. Absent.

  Next, examples according to the above-described embodiment will be described.

  A method for setting the first jig 1 will be described with reference to FIG. The setting of the first jig 1 was performed using the values of B / A and D / C as described in the embodiment. By using a square jig with a long side length A = 60 mm, a short side length C = 42 mm, and a height of 30 mm as a base, the height of the base formed around this square jig is changed little by little. A plurality of types of first jigs 1 having different lengths C and D were prepared. An element body 2 was formed by continuously winding a long ribbon made of Fe-based amorphous having a width of 30 mm and a length of about 30 m on each of the first jigs 1. The space factor was calculated from the weight, density and volume of the ribbon used.

The results are shown in Table 1. From Table 1, when the pedestal is not provided on the square jig (B / A = 0, D / C = 0), the ribbon does not fit on the four sides of the square jig, and the space factor is 62. It was a very low value of about%. Hereinafter, the same experiment was repeated by providing a pedestal on each side and changing the lengths C and D, respectively. As shown in Table 1, when B / A = 0.12 (7 mm / 60 mm) and D / C = 0.06 (2.4 mm / 42 mm), the space factor was 80.1%. Further, when B / A was 0.08 (5 mm / 60 mm) and D / C = 0.08 (3 mm / 42 mm), the space factor was 81.4%. Further, the upper limit values of B / A and D / C were set to 0.17 so as not to be close to the toroidal shape. Based on these results, it is understood that the following conditions 1 and 2 need to be satisfied in order to set the space factor of the element body 2 to 80% or more and to make the element body 2 have an elliptic cylinder shape. It was.
Condition 1: 0.08 ≦ B / A ≦ 0.17 and 0.08 ≦ D / C ≦ 0.17
Condition 2: 0.12 ≦ B / A ≦ 0.17 and 0.06 ≦ D / C ≦ 0.17

  Next, a specific application example of the manufacturing method of the above-described rectangular magnetic core will be described. Here, as the first jig 1, the long side A = 85.6 mm of the square part 41, the height of the arc B from the long side B = 10 mm, and the short side between the reference square part 41. A material having a relationship of C = 46.6 mm and arc height D = 4.5 mm from the short side was used. The height of the square part 41 is 20 mm. At this time, B / A = 0.12 and D / C = 0.1, which satisfies the above-mentioned condition 2. By using this first jig 1, the space factor is 80% or more, and An element body 2 having an elliptic cylinder shape is formed.

  As shown in FIG. 1A, the first jig 1 includes a pair of semi-elliptical columns 11, a connecting jig 12, and screws 13. In FIG. 1A, the connecting jig 12 is fixed to the front side of the pair of semi-elliptical columns 11 with screws 13, but in this embodiment, another connecting jig 12 is also connected to the back side of the paper (not shown). 13 is fixed to each of the pair of semi-elliptical columns 11. Since it is fixed with screws 13, the connecting jig 12 can be removed from the pair of semi-elliptical columns 11.

  In the step shown in FIG. 1A, the pair of semi-elliptical columns 11 are connected to each other by the connecting jig 12, and form a substantially elliptic column. In this state, a ribbon that is the material of the element body 2 is wound around the substantially elliptical cylinder. In this example, a thin strip made of Fe-based amorphous, having a thickness of about 25 μm, a total length of about 200 m, and a weight of about 510 g was wound around the first jig 1. At this time, it was confirmed that the ribbon was fitted and wound around the outer periphery of the elliptical column of the first jig 1.

  After the desired ribbon is wound up to form the element body 2, the screw 13 is loosened and the connecting jig 12 is removed from the pair of semi-elliptical columns 11. Thereby, the first jig 1 is removed from the element body 2. FIG. 1B shows the element body 2 with the first jig 1 removed.

  Next, the second jig 3 is inserted into the hollow portion 21 of the element body 2. First, the inner frames 31 and 32 are brought close to each other until the cross section of the second jig 3 becomes smaller than the hollow portion 21 of the element body 2, and then the inner frames 31 and 32 are accommodated in the hollow portion 21. The state at this time corresponds to FIG. Next, the center bar 33 is shallowly fitted into the groove 34. The state at this time corresponds to FIG. 1C and FIG. Next, the center bar 33 is pushed into the groove 34 by, for example, fastening a screw (not shown) that has penetrated the hole 37, and is fitted more deeply. As shown in FIGS. 3A and 3B, the groove 34 is provided with an inner frame inclined portion 35. On the other hand, the center rod inclined portion 36 is provided at a position facing the inner frame inclined portion 35 in the center rod 33 in the fitted state. For this reason, when the center bar 33 is pushed into the groove 34, the inner frame inclined part 35 and the center bar inclined part 36 slide on each other, and a part of the downward pushing force acts in the horizontal direction. The frames 31 and 32 move in opposite directions and are separated from each other. As a result, the substantially quadrangle that is the cross-sectional shape of the second jig 3 is deformed to be stretched in one direction. 2B and 3B correspond to the second jig 3 after deformation. In the present embodiment, the substantially square cross section of the second jig 3 is 5 mm, starting from a state where the four corners of the inner frames 31 and 32 are inscribed in the hollow portion 21 of the element body 2 by pushing the center rod 33. A second jig 3 that was stretched was used.

  With such deformation of the second jig 3, the element body 2 surrounding the second jig 3 is stretched. As a result, the element body 2 is deformed to form the square magnetic core 38. This state corresponds to FIG. As described above, since the shape of the element body 2 that is the starting point when it is stretched is a hollow elliptical column, it can be easily deformed as compared with the case where the element body is deformed starting from a toroidal element.

  After the deformation of the second jig 3 is completed, the outer frames 39 and 40 are fitted to the outside of the square magnetic core 38 to maintain the square shape. The state at this time corresponds to FIG. The completed square magnetic core has an outer shape of 124 mm x 75.3 mm x 20 mm and a thickness of about 14 mm. After production, the space factor was measured and found to be 81.3%.

  According to the present embodiment, the element body 2 is formed by winding a long thin ribbon. For this reason, for example, there is no need for a step of cutting the ribbon in advance into a plurality of strips, a step of temporarily holding the strips in the process of stacking the strips, or the like. Moreover, when winding a thin ribbon, the 1st jig | tool 1 which has a substantially elliptic column shape of suitable size was used. For this reason, the ribbon was fitted to the outer periphery of the first jig 1, and an element body 2 formed by tightly winding the ribbon was obtained. As a result, a square magnetic core having a high space factor can be obtained. In addition, since the element body 2 having a suitable elliptic cylinder shape is used as a starting point, the rectangular magnetic core 38 is deformed, so that deformation is easier than deformation from a toroidal shape. Occurrence can be suppressed.

  As mentioned above, although the Example of this invention was described, this invention is not limited above, The change and correction of a structure are possible in the range which does not deviate from the summary of this invention. That is, various changes and modifications that can be made by those skilled in the art are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 1st jig | tool 2 Element body 11 A pair of semi-ellipsoidal column 12 Connection jig | tool 13 Screw 14 Crevice 21 Hollow part 3 2nd jig | tool 31, 32 Inner frame 33 Center rod 34 Groove 35 Inner frame inclination part 36 Center rod Inclined portion 37 Hole 38 Square magnetic core 39, 40 Outer frame 41 Square portion

Claims (7)

Using a first jig having an elliptic cylinder shape at least in part to obtain an element body having a hollow elliptic cylinder shape;
Removing the first jig from the hollow of the element body;
Inserting a portion of the quadrangular prism of the second jig having a quadrangular prism shape at least in part into the hollow of the element body;
Deforming the quadrangular prism portion of the second jig inserted into the hollow into a predetermined shape and deforming the element body in accordance with the deformation, thereby obtaining a square magnetic core; The manufacturing method of the square-shaped magnetic core characterized by including.   The corner according to claim 1, wherein the element body is obtained by continuously winding a thin ribbon made of metal on at least two rounds around the elliptical cylindrical portion of the first jig. A manufacturing method of a mold magnetic core. The second jig includes a first inner frame and a second inner frame,
3. The element body according to claim 1, wherein the element body is deformed by moving the first inner frame and the second inner frame in directions different from each other when viewed from the axial direction of the quadrangular prism. The manufacturing method of the square-shaped magnetic core as described.   Between the first inner frame and the second inner frame, a fourth jig is inserted from the axial direction of the quadrangular prism between the first inner frame and the second inner frame. The method for manufacturing a rectangular magnetic core according to claim 3, wherein the first inner frame and the second inner frame are moved in different directions by spreading the first and second inner frames. The section of the second jig is inscribed in relation to the ellipse of the section of the first jig,
E is the length of the long side of the second jig,
The height of the arc of the cross section of the first jig connecting both ends of the long side of the second jig 3 when viewed from the long side of the second jig is F,
The length of the short side of the second jig is G,
When viewed from the short side of the second jig, when the arc height H of the cross section of the first jig connecting both ends of the short side of the second jig,
Satisfies the condition of 0.08 ≦ F / E ≦ 0.17 and 0.08 ≦ H / G ≦ 0.17, or
5. The method for manufacturing a rectangular magnetic core according to claim 1, wherein the conditions of 0.12 ≦ F / E ≦ 0.17 and 0.06 ≦ H / G ≦ 0.17 are satisfied. A first jig having at least a part of the shape of an elliptic cylinder for winding a ribbon;
When a space corresponding to the elliptical column after the first jig is extracted from an element formed by winding the thin ribbon around the elliptical column of the first jig is called a hollow part, the hollow And a second jig having a quadrangular cross section that is extendable from a size that can be inserted into the section to a predetermined size. Using a first jig having an elliptic cylinder shape at least in part to obtain an element body having a hollow elliptic cylinder shape;
Removing the first jig from the hollow of the element body;
Inserting a portion of the quadrangular prism of the second jig having a quadrangular prism shape at least in part into the hollow of the element body;
Deforming the quadrangular prism portion of the second jig inserted into the hollow into a predetermined shape and deforming the element body in accordance with the deformation, thereby obtaining a square magnetic core; A method of manufacturing a rectangular magnetic core including:
The section of the second jig is inscribed in relation to the ellipse of the section of the first jig,
E is the length of the long side of the second jig,
The height of the arc of the cross section of the first jig connecting both ends of the long side of the second jig 3 when viewed from the long side of the second jig is F,
The length of the short side of the second jig is G,
When viewed from the short side of the second jig, when the arc height H of the cross section of the first jig connecting both ends of the short side of the second jig,
Satisfies the condition of 0.08 ≦ F / E ≦ 0.17 and 0.08 ≦ H / G ≦ 0.17, or
A rectangular magnetic core manufactured by the method for manufacturing a rectangular magnetic core satisfying the conditions of 0.12 ≦ F / E ≦ 0.17 and 0.06 ≦ H / G ≦ 0.17.

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