JP4585076B2 - Magnetic thin plate, laminated magnetic core and manufacturing method thereof - Google Patents

Description

次に、これら実施例１、２、比較例１、２の磁性薄板を３０枚主面を接触させた積層状態で立てて台の上に配置して熱処理を行い、その際の溶着強度を測定した。溶着強度は、磁性薄板どうしを離す際に要する力（剥離力）を測定することにより行った。ここで、測定結果は、各実施例及び比較例について３０枚×３回ずつ行った際の、測定値の範囲を表したものである。
【００５１】
さらに、これら熱処理後の磁性薄板を積層して積層磁心を作製し、それらの占積率及び磁気特性（１ｋＨｚにおけるトランスインダクタンス特性）を調べた。
これらの結果を表２に示す。
【００５２】
【表２】

表２の結果からわかるように、本発明の磁性薄板はバリ高さが低く平面度に優れるために、熱処理の際に溶着が抑制され、剥離力が低く作業性に優れることが分かった。これに対して、一方向のみからプレスを行った比較例１、２では、プレス後に研磨をしなかったものについては、剥離力が非常に高くなることがわかった。また、プレス後に研磨を行ったものにおいても、剥離力が若干高く、作業性に劣ることが分かった。
【００５３】
また、これらを積層した積層磁心においては、本発明の実施例では占積率に優れているため、トランスインダクタンス特性が高い値となった。これに対して、比較例では、研磨によりバリ高さを低くしたものでも占積率が若干低くなりトランスインダクタンス特性が低くなった。また、バリを研磨しなかったものでは、さらに占積率が低くなりトランスインダクタンス特性も低い値となった。
【００５４】
以上のことより、本発明の磁性薄板はプレス後に研磨等の特別な処理を行わなくても、熱処理の際の溶着を抑制し、十分に剥離力を低減させることが可能となることがわかった。また、本発明の磁性薄板はバリ高さが低くかつ平面度に優れるため、これらを積層した本発明の積層磁心は占積率が高く、磁気特性に優れるものであることがわかった。次に、実施例１、２の積層磁心をモデムに組み込んだときの１ｋＨｚにおける高周波歪み率（ｄＢ）を測定した結果を表３に示す。この高周波歪み率とは、モデムの性能を示すために使われるパラメータのことで、波形をどれだけ正確に伝えることができるかを示すものであり、マイナスが大きいほど優れたモデムであることを示すものである。
【００５５】
【表３】

表３から分かる通り、本発明の実施例の積層磁心を用いたものはいずれも高周波歪み率が−８０以下と優れた特性を示すことがわかった。
【００５６】
このことから分かる通り、本発明の積層磁心はモデム等の波形信号（パルス信号）を取り扱う分野の機器において優れた効果を発揮するものであることがわかる。
【００５７】
【発明の効果】
本発明の磁性薄板は主面上に形成される凸部の高さが低いため、熱処理の際に溶着や反り等が発生するのを抑制することが可能となる。従って、溶着や反り等による不良品発生を抑制するとともに、作業性等も向上させることができる。また、本発明の磁性薄板は主面上に形成される凸部の高さが低いため、これらを効率的に積層することが可能となる。本発明の磁性薄板を用いて作製される積層磁心は、占積率に優れ、磁気特性に優れるものである。特に、本発明の積層磁心はモデム用磁心として優れた効果を発揮するものである。
【００５８】
本発明の磁性薄板の製造方法では、熱処理の際の溶着や反り等を抑制した磁性薄板を容易に作製することが可能となる。また、本発明の積層磁心の製造方法では、占積率及び磁気特性等に優れる積層磁心を効率的に作製することが可能となる。
【図面の簡単な説明】
【図１】本発明の磁性薄板の一実施例を表す外観図。
【図２】本発明の磁性薄板の一実施例を表す断面図
【図３】本発明の磁性薄板の一実施例を表す側面図。
【図４】本発明の磁性薄板の他の実施例を表す外観図。
【図５】本発明の積層磁心の一実施例を表す断面図。
【図６】本発明の磁性薄板の製造前の状態を表す断面図。
【図７】本発明の磁性薄板の一製造工程を表す断面図。
【図８】本発明の磁性薄板の一製造工程を表す断面図。
【図９】従来の磁性薄板を表す外観図。
【図１０】従来の積層磁心を表す断面図。
【符号の説明】
１……磁性薄板
２……主面外周縁部内側
３……側面部
４……側面部の凸部
５……主面上の凸部
９……基材
１０……上型
１１……下型
１２……上パンチ
１３……下パンチ[0001]
BACKGROUND OF THE INVENTION
The present invention is used for, for example, a transformer for a modem and the like, and particularly relates to a magnetic thin plate excellent in workability and laminateability, a laminated magnetic core, and a manufacturing method thereof.
[0002]
[Prior art]
Conventionally, when a laminated magnetic core is manufactured, for example, a belt-like thin plate material is intermittently transferred by a progressive die apparatus or the like, and a portion that becomes a magnetic thin plate of the belt-like thin plate material is pressed by a press device. In the conventional apparatus, this press is only a punch from one direction. Therefore, as shown in FIG. 9, the obtained magnetic thin plate 16 has a protrusion 18 called a burr on the outer peripheral edge 17 inside the main surface. It was inevitable that it was formed.
[0003]
Thus, when the convex part was formed inside the outer peripheral edge part of the main surface, the magnetic thin plates were often welded in the next heat treatment step. When the welding phenomenon occurred, it could not be applied to the subsequent lamination process, resulting in a failure. In order to prevent such a welding phenomenon, it is possible to heat-treat the magnetic thin plates individually one by one. However, since the number of sheets that can be heat-treated at a time in a space is limited, a method with high production efficiency is not always necessary. There wasn't. For this reason, it has been important from the viewpoint of manufacturing efficiency to heat-treat the magnetic thin plates stacked vertically or horizontally. In addition, if the convex portion 18 is formed on the inner peripheral edge 17 of the main surface, there is a risk of deformation such as warpage during heat treatment, especially in the case of a magnetic thin plate with many corners such as an E shape. As described above, it was necessary to perform heat treatment with the magnetic thin plates stacked vertically or horizontally. Furthermore, if there are convex portions such as burrs inside the outer peripheral edge of the main surface, a space 19 is formed between the magnetic thin plates 16 when the magnetic thin plates 16 are laminated, as shown in FIG. In some cases, this leads to a decrease in rate and leads to a decrease in magnetic properties.
[0004]
In particular, in a magnetic thin plate having many corner portions such as an E shape, such burrs are generated at each corner portion, so that the deterioration of the characteristics of the laminated magnetic core is remarkable.
[0005]
In recent years, such a laminated magnetic core has been used in various fields. In particular, with the development of high-speed communication technology, laminated magnetic cores made of various magnetic materials have been applied as magnetic cores used for modem transformers. However, since the conventional magnetic thin plate has protrusions such as burrs as described above, the space factor cannot be improved, and when used in a modem transformer, the characteristics are not always sufficient.
[0006]
[Problems to be solved by the invention]
As described above, burrs and the like are formed on the outer peripheral edge of the main surface of the magnetic core thin plate produced by pressing from one direction, which causes welding and warpage during heat treatment.
[0007]
In order to prevent such welding and warping, it has been devised to remove the convex portion by polishing or the like. However, such polishing requires high-precision technology and processing time. For example, barrel polishing is an example of such a polishing method. However, even when barrel polishing is applied to a polygonal magnetic thin plate with many corners such as an E shape, it is difficult to completely scrape the convex portions present at each corner. In addition, as another method, there is a method of directly scraping the convex portion, but this method takes more time than necessary, and this leads to an increase in cost particularly when a large number of magnetic thin plates are laminated. It was.
[0008]
Also, instead of polishing the convex portions, it has been attempted to prevent welding or warping by drawing powder for preventing welding on a table or between magnetic thin plates during heat treatment. By such a method, a certain effect is recognized with respect to welding, warping, and the like. However, it is difficult to completely remove the powder used in the heat treatment from the magnetic thin plate, and when these magnetic thin plates are laminated, these powders remain between the magnetic thin plates, resulting in a decrease in the space factor. As a result, the characteristics of the laminated magnetic core are degraded.
[0009]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a magnetic thin plate that is easy to manufacture and excellent in lamination properties. Another object of the present invention is to provide a laminated magnetic core that is manufactured using the above-described magnetic thin plate, has an excellent space factor, and is particularly suitable for a modem magnetic core. Furthermore, an object of the present invention is to provide a method for efficiently producing these magnetic thin plates and laminated magnetic cores.
[0010]
[Means for Solving the Problems]
The magnetic thin plate of the present invention is a magnetic thin plate obtained by performing heat treatment after punching a metal alloy thin plate, and the height of the convex portion formed inside the outer peripheral edge of the main surface of the magnetic thin plate is It is characterized by being 1 μm or more and 5 μm or less and a flatness of 0.006 mm or more and 0.02 mm or less.
[0011]
The protrusions formed on the outer peripheral edge of the main surface of the magnetic thin plate are preferably formed in a range of 20 μm or less from the outer peripheral edge of the main surface .
[0013]
Furthermore, it is preferable that the metal alloy thin plate used for producing the magnetic thin plate of the present invention is mainly composed of a soft magnetic thin plate.
[0014]
The laminated magnetic core of the present invention is formed by laminating the magnetic thin plates. The laminated magnetic core of the present invention preferably has a space factor of 90% to 97% . In particular, the laminated magnetic core of the present invention is preferably applied as a laminated magnetic core for modems. When applied to such a field, the high-frequency distortion rate can be improved.
[0015]
The method for producing a magnetic thin plate of the present invention includes a step of shearing a part of the thickness of the metal alloy thin plate by pressing from one of the metal alloy thin plates, and pressing from the other of the metal alloy thin plates, A step of flat-pressing the processed portion, and a portion of the flat-pressed portion are punched out by pressing again from the same direction as the flat-pressing step, and the convex portion formed inside the outer peripheral edge of the main surface And a step of obtaining a sheet having a height of not less than 1 μm and not more than 5 μm and a step of obtaining a magnetic thin plate having a flatness of not less than 0.006 mm and not more than 0.02 mm by heat-treating the punched material. It is.
[0016]
The metal alloy thin plate is preferably sheared in a range of ¼ to ¾ of the thickness of the metal alloy thin plate. Moreover , it is preferable that the said metal alloy thin plate used for manufacture of the magnetic thin plate of this invention consists of crystalline materials.
[0017]
The method for producing a laminated magnetic core according to the present invention is characterized by comprising a step of producing a magnetic thin plate by the above-described method of producing a magnetic thin plate and a step of laminating the magnetic thin plate.
[0018]
The magnetic thin plate of the present invention suppresses welding with a base or other magnetic thin plate when heat-treating the magnetic thin plate by setting the height of the convex portion formed on the inner peripheral edge of the main surface to 5 μm or less. The workability can be improved and the magnetic thin plates can be efficiently laminated.
[0019]
By setting the convex portion to a range of 20 μm from the outer peripheral edge portion, it is possible to further suppress the welding with the base or another magnetic thin plate, and to efficiently stack the magnetic thin plates.
[0020]
The above-described magnetic thin plate of the present invention is particularly effective when the thickness of the magnetic thin plate is 1 mm or less, and the space factor can be improved when laminated.
[0021]
Furthermore, in the magnetic thin plate of the present invention, the space factor can be further improved by setting the flatness after heat treatment to 0.02 mm or less.
[0022]
The magnetic thin plate of the present invention is mainly composed of a soft magnetic thin plate, whereby the magnetic properties of the laminated magnetic core can be improved.
[0023]
The laminated magnetic core of the present invention is formed by laminating the above-mentioned magnetic thin plates and has excellent magnetic properties. By setting the space factor of the laminated magnetic core to 90% or more, the magnetic properties can be further improved.
[0024]
According to the method of manufacturing a magnetic thin plate of the present invention, a part of the thickness of the metal alloy thin plate is sheared by pressing from one of the metal alloy thin plates, and then pressed from the other of the metal alloy thin plates. Generation of burrs inside the outer peripheral edge of the main surface of the magnetic thin plate by flat-pressing the processed portion and then pressing and punching the pressed portion again in the same direction as the flat-pressing step Can be suppressed. At this time, it is possible to further suppress the occurrence of burrs inside the outer peripheral edge of the main surface of the magnetic thin plate by performing the shearing process in the range of 1/4 to 3/4 of the thickness of the metal plate. .
[0025]
The method for manufacturing a laminated magnetic core according to the present invention is to laminate the above-described magnetic thin plates and has an excellent space factor, so that a laminated magnetic core having excellent magnetic properties can be produced.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0027]
FIG. 1 is an external view showing a magnetic thin plate of the present invention. In the magnetic thin plate 1 of the present invention, there is no high convex portion on the main surface outer peripheral edge portion inner side 2 of the magnetic thin plate, unlike the conventional magnetic thin plate, and the convex portion 4 exists mainly on the side surface portion 3 of the magnetic thin plate. is there. A convex part here is a part called the burr | flash etc. which generate | occur | produce in the case of a process of a magnetic thin plate, for example.
[0028]
In the magnetic thin plate of the present invention, since there are no high convex portions on the main surface, welding with a table or other magnetic thin plate can be suppressed during heat treatment. Further, since there are no high convex portions on the main surface, it is possible to suppress the occurrence of deformation such as bending and warping of the magnetic thin plate during the heat treatment.
[0029]
FIG. 2 is a sectional view showing a part of the magnetic thin plate of the present invention. The convex portion 5 present on the inner peripheral edge 2 of the main surface has a height H and a width L.
H ≦ 5μm
L ≦ 20μm
It is.
[0030]
When the height of the convex portion exceeds 5 μm, the convex portions of the adjacent magnetic thin plates come into contact with each other during the heat treatment, so that the convex portions are easily welded. On the other hand, if the height of the convex portion exceeds 5 μm, the magnetic thin plate is likely to be deformed such as curved or warped during heat treatment. It is susceptible to heat treatment when magnetic thin plates are stacked vertically or horizontally. In addition, even a shape with many corners such as an E shape is likely to be affected by bending, warping, and the like. Therefore, by setting the height of the convex portion to 5 μm or less, it becomes possible to suppress such welding and deformation of the magnetic thin plate.
[0031]
Further, when the height of the convex portion 4 formed on the side surface portion 3 of the magnetic thin plate is W,
W ≦ 10μm
It is preferable that By setting the height W of the side surface portion to 10 μm or less, the dimensional accuracy as the magnetic core is stabilized, and the side surfaces can be stacked without shifting the side surfaces.
[0032]
Furthermore, in the magnetic thin plate of the present invention, when the thickness is Z,
Z ≦ 1mm
It is preferable to use them. When the thickness Z of the magnetic thin plate exceeds 1 mm, even if these are laminated, a decrease in the space factor due to the convex portion 5 is not a problem. Further, when the thickness Z of the magnetic thin plate exceeds 1 mm, deformation due to heat treatment hardly occurs. Such a space factor or deformation becomes a problem when the magnetic thin plate is thin, that is, when the thickness Z is 1 mm or less. Therefore, by applying the present invention to a magnetic thin plate having a thickness of 1 mm or less, the space factor can be further improved and the magnetic characteristics can be improved. In addition, the thickness Z of the present invention is a value obtained by a both-sphere micrometer.
[0033]
FIG. 3 is an external view when the magnetic thin plate after heat treatment is viewed from the side in the present invention. In the magnetic thin plate of the present invention, when the flatness is S,
S ≦ 0.02mm
Der Ru. The flatness here is expressed by flatness (S) = (flatness tolerance t−sheet thickness Z), and the flatness tolerance t is JIS-B-0021 “18.2 Flatness tolerance. ”. When the flatness S of the magnetic thin plate exceeds 0.02 mm, when these are laminated to produce a laminated magnetic core or the like, the space factor is lowered, and the magnetic properties may be lowered. In the present invention, the flatness S can be set to 0.02 mm or less by setting the height of the convex portion formed on the main surface of the magnetic thin plate to 5 μm or less.
[0034]
Such a magnetic thin plate of the present invention is preferably made of a soft magnetic material. By using a soft magnetic material for the magnetic thin plate, the magnetic properties can be greatly improved when a laminated magnetic core or the like is produced. As such a soft magnetic material, for example, a crystalline material such as permalloy or an amorphous material such as amorphous can be used.
[0035]
Although the magnetic thin plate of the present invention has been described above, the magnetic thin plate of the present invention is not limited to the disk-shaped one as shown in FIG. Is also effective. As shown in FIG. 4, the shape having many corner portions 6, 7, 8 and the like has a high convex portion formed on the main surface of the corner portion, which causes welding and deformation during heat treatment. I will let you. Therefore, by applying the present invention to such a shape, it becomes possible to suppress welding and deformation during heat treatment, and when these are laminated, the space factor can be improved. Become.
[0036]
Next, the laminated magnetic core of the present invention will be described.
[0037]
FIG. 5 is a sectional view showing the laminated magnetic core of the present invention. The laminated magnetic core of the present invention is obtained by laminating the magnetic thin plate 1 of the present invention described above. In the magnetic thin plate 1 of the present invention, the height of the convex portion on the outer peripheral edge of the main surface is as low as 5 μm or less, and there is little deformation etc. Therefore, the laminated magnetic core of the present invention in which these are laminated has a high space factor and magnetic properties. It is an excellent one. The space factor of the laminated magnetic core of the present invention is preferably 90% or more. This is because if the space factor is less than 90%, the magnetic characteristics become low, which makes it impractical. Here, the space factor is the area ratio of the entire magnetic thin plate in the cross-sectional area of the laminated magnetic core in the lamination direction.
[0038]
Next, the manufacturing method of the magnetic thin plate of this invention is demonstrated. 6 to 8 show the steps in manufacturing the magnetic thin plate of the present invention in order.
[0039]
FIG. 6 shows a state before processing the magnetic thin plate of the present invention. A base material 9 which is a material for the magnetic thin plate is sandwiched between an upper mold 10 and a lower mold 11 on the upper and lower sides thereof. The upper mold 10 and the lower mold 11 are provided with holes 14 and 15 into which the upper punch 12 and the lower punch 13 for pressing the substrate are inserted. The holes 14 and 15 of the upper mold 10 and the lower mold 11 are slightly larger than the diameters of the upper punch 12 and the lower punch 13.
[0040]
FIG. 7 shows a process of shearing the magnetic thin plate of the present invention. The substrate 9 is sheared by pressing the upper punch 12. At this time, it is preferable that a part of the base material 9 is connected to another base material 9 without completely punching the base material 9. As the width of such a press, when the press width is P and the thickness of the substrate is Z,
(1/4) · Z ≤ P ≤ (3/4) · Z
It is preferable to set it as the range. If the press width P is less than (1/4) · Z, there is not much difference from the production of magnetic thin plates by conventional presses, and high protrusions are formed inside the outer peripheral circular part of the main surface of the magnetic thin plate when it is removed. There is a risk that. Further, if the press width P exceeds (3/4) · Z, a high convex portion is formed in the first shearing process, and the convex portion may remain even after being removed.
[0041]
Therefore, the height of the convex part formed inside the outer peripheral circular part of the main surface of a magnetic thin plate can be suppressed by making press width P into said range.
[0042]
FIG. 8 shows a state in which, after the shearing process in FIG. 7, the lower punch 13 is pressed in the direction opposite to the above-described direction, and the heights of the base material 9 and the magnetic thin plate are matched. Further, the magnetic thin plate of the present invention can be manufactured by pressing with the lower punch 13 and punching out the portion to be the magnetic thin plate.
[0043]
Thus, by first pressing from above with the upper punch, then pressing from below with the lower punch, and dividing and pressing, the convex portions are formed on the main surface of the magnetic thin plate. It becomes possible to suppress. Such pressing from above and below may be performed a plurality of times, and can be appropriately selected depending on the material and thickness of the substrate. As the substrate, it is preferable to use a soft magnetic material having excellent magnetic properties. Moreover, since such a convex part on the main surface becomes a problem particularly when the thickness of the substrate is thin, it is effective when the thickness of the substrate is 1 mm or less.
[0044]
According to the method for producing a magnetic thin plate of the present invention, the height of the convex portion on the main surface of the magnetic thin plate can be greatly suppressed, thereby suppressing welding during heat treatment and improving workability. it can. Further, even in the case of lamination, the space factor can be improved because the height of the convex portion on the main surface is low.
[0045]
The laminated magnetic core of the present invention can be produced by laminating the magnetic thin plates obtained as described above, and since the convex portion on the main surface is very low, it has excellent space factor when laminated, Magnetic characteristics can be improved.
[0046]
【Example】
Examples 1 and 2 and Comparative Examples 1 and 2
The effect of the pressing method and the burr height of the magnetic thin plate on the welding during the heat treatment was investigated. In addition, the magnetic characteristics and the like when a laminated magnetic core was produced using these magnetic thin plates were also investigated.
[0047]
As a magnetic thin plate, a permalloy magnetic alloy thin plate having a thickness (Z) of 0.6 mm is first pressed from above as shown in FIG. 7, and then a permalloy magnetic alloy is pressed as shown in FIG. The thin plate and the magnetic thin plate were produced by pressing from below so that the portions to be the same height were pressed, and further pressing and punching from below (pushback method). At this time, the height of the burr generated on the main surface of the magnetic thin plate was adjusted by changing the press width at the time of the first press working. These were set as Examples 1 and 2 of the present invention.
[0048]
On the other hand, as a comparison with the present invention, a magnetic thin plate was produced by pressing from only one direction (drop-out method). Among these, barrel polishing was performed after press working and burrs were polished, and Comparative Example 1 was used.
[0049]
Table 1 shows the burr height and flatness on the main surface of the magnetic thin plates of Examples 1 and 2 and Comparative Examples 1 and 2.
[0050]
[Table 1]

Next, 30 magnetic thin plates of Examples 1 and 2 and Comparative Examples 1 and 2 were erected in a stacked state in which the principal surfaces were in contact with each other and placed on a table to perform heat treatment, and the welding strength at that time was measured. did. The welding strength was measured by measuring the force (peeling force) required to separate the magnetic thin plates. Here, a measurement result represents the range of a measured value when performing 30 sheets x 3 times for each example and comparative example.
[0051]
Furthermore, a laminated magnetic core was produced by laminating these heat-treated magnetic thin plates, and their space factor and magnetic characteristics (transformer inductance characteristics at 1 kHz) were examined.
These results are shown in Table 2.
[0052]
[Table 2]

As can be seen from the results in Table 2, since the magnetic thin plate of the present invention has a low burr height and excellent flatness, it was found that welding was suppressed during heat treatment, and the peel force was low and the workability was excellent. On the other hand, it was found that in Comparative Examples 1 and 2 in which the pressing was performed from only one direction, the peeling force was very high for those not polished after pressing. In addition, it was found that even after polishing after pressing, the peel force was slightly high and the workability was poor.
[0053]
Further, in the laminated magnetic core in which these are laminated, the transformer inductance characteristic is a high value because the space factor is excellent in the embodiment of the present invention. On the other hand, in the comparative example, even when the burr height was lowered by polishing, the space factor was slightly lowered and the transformer inductance characteristics were lowered. Further, in the case where the burr was not polished, the space factor was further lowered and the transformer inductance characteristics were also low.
[0054]
From the above, it was found that the magnetic thin plate of the present invention can suppress welding during heat treatment and sufficiently reduce the peeling force without performing special treatment such as polishing after pressing. . Further, since the magnetic thin plate of the present invention has a low burr height and excellent flatness, it has been found that the laminated magnetic core of the present invention in which these are laminated has a high space factor and excellent magnetic properties. Next, Table 3 shows the results of measuring the high-frequency distortion rate (dB) at 1 kHz when the laminated magnetic cores of Examples 1 and 2 are incorporated in a modem. This high frequency distortion factor is a parameter used to indicate the performance of the modem. It indicates how accurately the waveform can be transmitted. The larger the minus value, the better the modem. Is.
[0055]
[Table 3]

As can be seen from Table 3, it was found that all of the examples using the laminated magnetic cores of the present invention exhibited excellent characteristics with a high frequency distortion rate of -80 or less.
[0056]
As can be seen from the above, it can be seen that the laminated magnetic core of the present invention exhibits excellent effects in devices in the field of handling waveform signals (pulse signals) such as modems.
[0057]
【The invention's effect】
In the magnetic thin plate of the present invention, since the height of the convex portion formed on the main surface is low, it is possible to suppress the occurrence of welding, warpage, or the like during the heat treatment. Therefore, it is possible to suppress the generation of defective products due to welding, warpage, and the like, and to improve workability and the like. Moreover, since the magnetic thin plate of this invention has the low height of the convex part formed on a main surface, it becomes possible to laminate | stack these efficiently. The laminated magnetic core produced using the magnetic thin plate of the present invention has excellent space factor and excellent magnetic properties. In particular, the laminated magnetic core of the present invention exhibits excellent effects as a modem magnetic core.
[0058]
In the method for producing a magnetic thin plate of the present invention, it is possible to easily produce a magnetic thin plate that suppresses welding, warpage, and the like during heat treatment. Further, according to the method for manufacturing a laminated magnetic core of the present invention, it is possible to efficiently produce a laminated magnetic core having excellent space factor and magnetic characteristics.
[Brief description of the drawings]
FIG. 1 is an external view showing an embodiment of a magnetic thin plate of the present invention.
FIG. 2 is a sectional view showing an embodiment of the magnetic thin plate of the present invention. FIG. 3 is a side view showing an embodiment of the magnetic thin plate of the present invention.
FIG. 4 is an external view showing another embodiment of the magnetic thin plate of the present invention.
FIG. 5 is a cross-sectional view illustrating an example of a laminated magnetic core according to the present invention.
FIG. 6 is a cross-sectional view showing a state before manufacturing the magnetic thin plate of the present invention.
FIG. 7 is a cross-sectional view showing one manufacturing process of the magnetic thin plate of the present invention.
FIG. 8 is a cross-sectional view showing one manufacturing process of the magnetic thin plate of the present invention.
FIG. 9 is an external view showing a conventional magnetic thin plate.
FIG. 10 is a cross-sectional view showing a conventional laminated magnetic core.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Magnetic thin plate 2 ... Main-surface outer-periphery inner side 3 ... Side surface part 4 ... Convex part 5 of a side part ... Convex part 9 on a main surface ... Base material 10 ... Upper mold | type 11 ... Bottom Mold 12 …… Upper punch 13 …… Lower punch

Claims (10)

After punching out the metal alloy thin plate, it is a magnetic thin plate obtained by further heat treatment,
The magnetic thin plate characterized in that the height of the convex portion formed on the inner peripheral edge of the main surface of the magnetic thin plate is 1 μm or more and 5 μm or less, and the flatness is 0.006 mm or more and 0.02 mm or less.   The magnetic thin plate according to claim 1, wherein the convex portion formed on the outer peripheral edge of the main surface of the magnetic thin plate is formed in a range of 20 μm or less from the outer peripheral edge of the main surface. 3. The magnetic thin plate according to claim 1, wherein the metal alloy thin plate is mainly composed of a soft magnetic thin plate. A laminated magnetic core comprising a laminate of the magnetic thin plates according to any one of claims 1 to 3 . The laminated magnetic core according to claim 4 , wherein the space factor is 90% or more and 97% or less . Laminated magnetic core according to claim 4 or 5, wherein it is a core for application to modem. A step of shearing a part of the thickness of the metal alloy thin plate by pressing from one of the metal alloy thin plates;
Pressing from the other of the metal alloy thin plate, flat pressing the portion subjected to the shearing process,
A step of punching out the portion subjected to the flat pressing by pressing again from the same direction as the flat pressing step, and obtaining a projection having a height of 1 μm or more and 5 μm or less formed on the inner periphery of the main surface. When,
And a step of heat-treating the punched material to obtain a magnetic thin plate having a flatness of 0.006 mm or more and 0.02 mm or less. The method of manufacturing a magnetic thin plate according to claim 7 , wherein the shearing of the metal alloy thin plate is performed in a range of ¼ to ¾ of a thickness of the metal alloy thin plate. Method for producing a metal alloy thin plate magnetic sheet according to claim 7 or 8, characterized in that consists of crystalline material. A step of producing a magnetic thin plate by the method of producing a magnetic thin plate according to any one of claims 7 to 9 ,
And a step of laminating the magnetic thin plates.

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