JP2008232706A - Density distribution measuring method for green compact and device - Google Patents

Density distribution measuring method for green compact and device Download PDF

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JP2008232706A
JP2008232706A JP2007070217A JP2007070217A JP2008232706A JP 2008232706 A JP2008232706 A JP 2008232706A JP 2007070217 A JP2007070217 A JP 2007070217A JP 2007070217 A JP2007070217 A JP 2007070217A JP 2008232706 A JP2008232706 A JP 2008232706A
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density
magnetic
density distribution
distribution measuring
dust core
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JP4818963B2 (en
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Hideaki Nagashima
英明 長島
Shuichi Ishizawa
修一 石沢
Kinya Kobayashi
金也 小林
Yuji Enomoto
裕治 榎本
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Hitachi Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a density distribution measuring method for a green compact and its device for non-destructively performing 100% inspection on powder magnetic cores. <P>SOLUTION: A magnetic field generating means 20 comprises a ring-shaped nonmagnetic body 22 and a coil 24, and generates a magnetic field by energizing the coil. A powder magnetic core 10 is disposed along the inner circumference of the nonmagnetic body 22. A magnetic detection part 40 is for measuring magnetic flux density of the powder magnetic core 10. The powder magnetic core 10 is pressed out of what is obtained by adding a binder resin and a lubricant to soft magnetic powder having electric resistance making it possible to suppress eddy current among soft magnetic powder particles. The density of the powder magnetic core 10 is measured through the magnetic flux density detected by the detection part 40. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、圧粉成形体の密度分布を測定する方法及び装置に係り、特に、圧粉磁心の密度分布を測定する方法及び装置に関する。   The present invention relates to a method and apparatus for measuring the density distribution of a green compact, and more particularly, to a method and apparatus for measuring the density distribution of a dust core.

軟磁性粉末を加圧成形した圧粉磁心は、例えば、特許文献１により知られている。圧粉成形体では、加圧成形する場合、密度の不均一が生じるため、密度を均一にするために種々の努力が成されている。しかし、微妙な条件の違いから密度が小さい部分が含まれることもある。   A powder magnetic core obtained by press-molding soft magnetic powder is known from Patent Document 1, for example. In the green compact, when pressure molding is performed, non-uniformity of density occurs, and various efforts have been made to make the density uniform. However, a small density part may be included due to subtle differences in conditions.

従来、成形体の密度分布は、ロットから抜き取られたサンプルを用い、例えば、各部分に切断してアルキメデス法を用いて測定している。   Conventionally, the density distribution of a molded body is measured using a sample extracted from a lot, for example, by cutting each part and using the Archimedes method.

特開２００３−３１８０１４号公報JP 2003-318014 A

しかし、この抜き取り検査によって合格とされたロットにも、密度の分布が規定値よりも低いものが混入していることが予想される。この場合、金型から取り出す際に破損するか、破損せずに製品に組み込まれた後に、性能検査で不合格となる場合も想定される。   However, it is expected that even if the lot is accepted by this sampling inspection, the density distribution is lower than the specified value. In this case, it may be damaged when taken out from the mold, or it may be rejected in the performance inspection after being incorporated into the product without being damaged.

特に、圧粉磁心では、リングに突出部が付いているような構造であるため、粉体の性質から突出部の密度がリング部の密度よりも小さくなる場合が多い。しかも、アルキメデス法による検査は、破壊検査であるため、密度分布に異常がないものも、検査後は使用できなくなる。   In particular, since the powder magnetic core has a structure in which a protrusion is attached to the ring, the density of the protrusion is often smaller than the density of the ring due to the nature of the powder. Moreover, since the inspection by the Archimedes method is a destructive inspection, even if there is no abnormality in the density distribution, it cannot be used after the inspection.

本発明の目的は、圧粉磁心を非破壊で、全数検査可能な圧粉成形体の密度分布測定方法及び装置を提供することにある。   An object of the present invention is to provide a method and an apparatus for measuring the density distribution of a compacting body that can inspect all the dust cores in a nondestructive manner.

（１）上記目的を達成するために、本発明は、軟磁性粉末粒子間における渦電流を抑制し得る電気抵抗を有する軟磁性粉末にバインダー樹脂および潤滑剤を加えて加圧成形された圧粉磁心の密度分布を測定する圧粉成形体の密度分布測定方法において、前記圧粉成形体である前記圧粉磁心に磁場を印加し、前記圧粉磁心の磁束密度を測定することにより、前記圧粉磁心の密度を測定するようにしたものである。
かかる方法により、圧粉磁心を非破壊で、全数検査可能となる。 (1) In order to achieve the above object, the present invention provides a compacted powder obtained by adding a binder resin and a lubricant to a soft magnetic powder having an electrical resistance capable of suppressing eddy currents between soft magnetic powder particles. In the method for measuring the density distribution of a green compact that measures the density distribution of the magnetic core, a magnetic field is applied to the powder magnetic core that is the green compact, and the magnetic flux density of the powder magnetic core is measured. The density of the powder magnetic core is measured.
By this method, the dust core can be inspected in a non-destructive manner.

（２）上記（１）において、好ましくは、前記圧粉磁心は、円環状のリング部と、このリング部から内径方向に突出した突出部とから構成され、前記突出部の磁束密度から、密度を測定するようにしたものである。   (2) In the above (1), preferably, the dust core is composed of an annular ring portion and a protruding portion protruding in an inner diameter direction from the ring portion, and from the magnetic flux density of the protruding portion, the density Is to be measured.

（３）上記目的を達成するために、本発明は、軟磁性粉末粒子間における渦電流を抑制し得る電気抵抗を有する軟磁性粉末にバインダー樹脂および潤滑剤を加えて加圧成形された圧粉磁心の密度分布を測定する圧粉成形体の密度分布測定装置において、磁場を発生する磁場発生手段と、前記磁場発生手段により発生した磁場内に配置された前記圧粉成形体である前記圧粉磁心の磁束密度を測定する磁気検出部とを備え、前記磁気検出部により検出された磁束密度により、前記圧粉磁心の密度を測定するようにしたものである。
かかる方法により、圧粉磁心を非破壊で、全数検査可能となる。 (3) In order to achieve the above object, the present invention provides a compacted powder obtained by adding a binder resin and a lubricant to a soft magnetic powder having an electric resistance capable of suppressing eddy currents between soft magnetic powder particles. In a density distribution measuring apparatus for a green compact that measures the density distribution of a magnetic core, a magnetic field generating means for generating a magnetic field, and the green compact that is the green compact formed in the magnetic field generated by the magnetic field generating means A magnetic detection unit for measuring the magnetic flux density of the magnetic core, and the density of the dust core is measured by the magnetic flux density detected by the magnetic detection unit.
By this method, the dust core can be inspected in a non-destructive manner.

（４）上記（３）において、好ましくは、前記圧粉磁心は、円環状のリング部と、このリング部から内径方向に突出した突出部とから構成され、前記磁気検出部は、前記突出部の磁束密度から、密度を測定するようにしたものである。   (4) In the above (3), preferably, the dust core is composed of an annular ring portion and a protruding portion protruding in an inner diameter direction from the ring portion, and the magnetic detection portion is the protruding portion. The density is measured from the magnetic flux density.

（５）上記（４）において、好ましくは、前記磁気検出部を取り付けるアームを備え、前記アームを、前記リング部の中心を中心として回転させるようにしたものである。   (5) In the above (4), preferably, an arm to which the magnetic detection unit is attached is provided, and the arm is rotated about the center of the ring unit.

（６）上記（４）において、好ましくは、前記磁場発生手段を保持するテーブルを備え、このテーブルを回転させるようにしたものである。   (6) In the above (4), preferably, a table for holding the magnetic field generating means is provided, and the table is rotated.

本発明によれば、圧粉磁心を非破壊で、全数検査可能となる。   According to the present invention, the dust core can be inspected in a non-destructive manner.

以下、図１〜図５を用いて、本発明の一実施形態による圧粉成形体の密度分布測定装置の構成及び動作について説明する。
最初に、図１を用いて、本実施形態による圧粉成形体の密度分布測定装置によって密度測定される圧粉磁心の構成について説明する。
図１は、本発明の一実施形態による圧粉成形体の密度分布測定装置によって密度測定される圧粉磁心の構成を示す平面図である。 Hereinafter, the configuration and operation of the density distribution measuring apparatus for a green compact according to an embodiment of the present invention will be described with reference to FIGS.
First, the configuration of a dust core whose density is measured by the density distribution measuring device for a dust compact according to the present embodiment will be described with reference to FIG.
FIG. 1 is a plan view showing a configuration of a dust core whose density is measured by a density distribution measuring device for a dust compact according to an embodiment of the present invention.

圧粉磁心１０は、円環状のリング部１２と、リング部１２から内径方向に突出した突出部１４とから構成される。図示の例では、突出部１４は、１２個設けられており、リング部１２の円周方向に等間隔に設けられている。   The dust core 10 includes an annular ring portion 12 and a protruding portion 14 protruding from the ring portion 12 in the inner diameter direction. In the illustrated example, twelve protrusions 14 are provided, and are provided at equal intervals in the circumferential direction of the ring part 12.

圧粉磁心１０は、軟磁性粉末粒子間における渦電流を抑制し得る電気抵抗を有する軟磁性粉末に、バインダー樹脂および潤滑剤を加えて、加圧成形される。リング部１２と突出部１４は一体成形される。   The dust core 10 is pressure-molded by adding a binder resin and a lubricant to soft magnetic powder having an electrical resistance capable of suppressing eddy currents between soft magnetic powder particles. The ring portion 12 and the protruding portion 14 are integrally formed.

圧粉磁心１０は、２つの爪磁極の爪部分が、交互に円周方向に組み合わせるクローポール形回転電機のステータコアとして用いられる。ステータコアとして用いられる圧粉磁心１０のリング部１２の外周には、円周方向に、界磁巻線が巻回される。ステータコアの内周側には、ロータコアが回転可能に保持される。突出部１４は、ロータコアの磁束がステータコアに至るための磁極部として作用する。   The dust core 10 is used as a stator core of a claw pole type rotating electrical machine in which claw portions of two claw magnetic poles are alternately combined in the circumferential direction. A field winding is wound around the outer periphery of the ring portion 12 of the dust core 10 used as the stator core in the circumferential direction. The rotor core is rotatably held on the inner peripheral side of the stator core. The protrusion 14 acts as a magnetic pole part for the magnetic flux of the rotor core to reach the stator core.

図１に示す構造を有する圧粉磁心１０では、リング部１２に突出部１４が付いているような構造であるため、粉体の性質から突出部１４の密度がリング部１２の密度よりも小さくなる場合が多い。   In the dust core 10 having the structure shown in FIG. 1, since the ring portion 12 has a protrusion 14, the density of the protrusion 14 is smaller than the density of the ring 12 due to the nature of the powder. There are many cases.

次に、図２〜図４を用いて、本実施形態による圧粉成形体の密度分布測定装置の構成について説明する。
図２は、本発明の一実施形態による圧粉成形体の密度分布測定装置の構成を示す平面図である。図３は、本発明の一実施形態による圧粉成形体の密度分布測定装置の断面構成を示すシステムブロック図である。図４は、本発明の一実施形態による圧粉成形体の密度分布測定装置に用いる磁場発生手段の原理説明図である。 Next, the configuration of the density distribution measuring apparatus for a green compact according to the present embodiment will be described with reference to FIGS.
FIG. 2 is a plan view showing a configuration of a density distribution measuring apparatus for a green compact according to an embodiment of the present invention. FIG. 3 is a system block diagram showing a cross-sectional configuration of a density distribution measuring device for a green compact according to an embodiment of the present invention. FIG. 4 is an explanatory diagram of the principle of the magnetic field generating means used in the density distribution measuring device for a green compact according to one embodiment of the present invention.

図２及び図３に示すように、圧粉磁心１０は、磁場発生手段２０の内周側に設置される。磁場発生手段２０は、リング状非磁性体２２と、リング状非磁性体２２の外周に巻回されたコイル２４とから構成されている。   As shown in FIGS. 2 and 3, the dust core 10 is installed on the inner peripheral side of the magnetic field generating means 20. The magnetic field generating means 20 includes a ring-shaped nonmagnetic material 22 and a coil 24 wound around the outer periphery of the ring-shaped nonmagnetic material 22.

ここで、図４に示すように、磁場発生手段２０のリング状非磁性体２２の外周に巻かれたコイル２４に電流Ｉを流すことによって、リング状非磁性体２２の外周に、矢印で示す方向に磁力線ＭＦが発生する。この磁力線ＭＦによって形成される磁場は、電流Ｉの大きさとコイル２４の巻き数の積に比例する。   Here, as shown in FIG. 4, the current I is passed through the coil 24 wound around the outer periphery of the ring-shaped nonmagnetic body 22 of the magnetic field generating means 20, and the outer periphery of the ring-shaped nonmagnetic body 22 is indicated by an arrow. Magnetic field lines MF are generated in the direction. The magnetic field formed by the magnetic field lines MF is proportional to the product of the magnitude of the current I and the number of turns of the coil 24.

図３において、コイル２２には、電源３０から通電され、電流Ｉが流れる。   In FIG. 3, the coil 22 is energized from the power source 30 and a current I flows.

図２において、磁気検出部４０は、アーム４２の先端に支持されており、矢印Ｒ１方向に回転する。磁気検出部４０は、例えば、ホール素子などが用いられ、磁気検出部４０の位置における磁束密度を検出する。磁気検出部４０は、圧粉鉄心１０の突出部１４の上に位置付けられている。また、磁気検出部４０は、半径方向，すなわち、矢印Ｒ２方向に位置を移動可能である。   In FIG. 2, the magnetic detection unit 40 is supported at the tip of the arm 42 and rotates in the direction of the arrow R1. For example, a Hall element is used as the magnetic detection unit 40 and detects the magnetic flux density at the position of the magnetic detection unit 40. The magnetic detection unit 40 is positioned on the protruding portion 14 of the dust core 10. Further, the magnetic detection unit 40 can move in the radial direction, that is, in the direction of the arrow R2.

図３に示すように、アーム４２は、シャフト４４に固定され、シャフト４４は、モータ４６によって回転される。モータ４６は、回転角で３６０度以上回転可能である。モータ４６は、シャフト４４の回転角度θの信号を出力する。   As shown in FIG. 3, the arm 42 is fixed to a shaft 44, and the shaft 44 is rotated by a motor 46. The motor 46 can rotate 360 degrees or more in rotation angle. The motor 46 outputs a signal of the rotation angle θ of the shaft 44.

信号検出部５０は、磁気検出部４０が検出した磁束密度の信号を取り込み、モータ４６の回転角度θの信号と関連づけて、判定部６０に出力する。判定部６０は、検出された磁束密度に応じて、その値が所定範囲内であれば、突出部１４の密度が所定範囲内に収まっていると判定する。   The signal detection unit 50 takes in the magnetic flux density signal detected by the magnetic detection unit 40 and outputs it to the determination unit 60 in association with the signal of the rotation angle θ of the motor 46. The determination unit 60 determines that the density of the protrusions 14 is within the predetermined range if the value is within the predetermined range according to the detected magnetic flux density.

ここで、図５を用いて、本実施形態による圧粉成形体の密度分布測定装置によって検出された磁束密度について説明する。
図５は、本発明の一実施形態による圧粉成形体の密度分布測定装置によって検出された磁束密度の説明図である。図５において、横軸は回転角度θを示し、基準位置の角度θを０度としている。縦軸は磁気検出部４０によって検出された磁束密度を示している。 Here, the magnetic flux density detected by the density distribution measuring apparatus of the green compact according to the present embodiment will be described with reference to FIG.
FIG. 5 is an explanatory diagram of magnetic flux density detected by the density distribution measuring device for a green compact according to an embodiment of the present invention. In FIG. 5, the horizontal axis indicates the rotation angle θ, and the reference position angle θ is 0 degree. The vertical axis represents the magnetic flux density detected by the magnetic detection unit 40.

磁束密度は、０度，３０度，６０度，９０度の位置付近で大きく、その間の１５度，４５度，７５度付近で小さくなる。これは、０度，３０度，６０度，９０度の付近は、図１に示した突出部１４の位置であり、その間の１５度，４５度，７５度付近は、隣接する突出部１４の間の空隙部である。空隙部に存在するのは空気であり、突出部１４には電気抵抗を有する軟磁性粉末の加圧成形したものが存在する。空気の透磁率は、軟磁性粉末の透磁率よりも小さいため、図４に示した磁場発生手段２０によって発生した磁場は、突出部１４の付近に集中し、突出部１４付近の磁束密度が大きくなり、また、空隙部の磁束密度が小さくなる。さらに、突出部１４における圧粉の密度が異なると、その密度に応じて、磁束密度も変化する。すなわち、圧粉の密度が大きくなるほど、磁束密度も大きくなる。   The magnetic flux density is large near the positions of 0 degree, 30 degrees, 60 degrees, and 90 degrees, and is small near 15 degrees, 45 degrees, and 75 degrees. This is the position of the protrusion 14 shown in FIG. 1 in the vicinity of 0 degrees, 30 degrees, 60 degrees, and 90 degrees, and the vicinity of 15 degrees, 45 degrees, and 75 degrees between them is the position of the adjacent protrusion 14. It is a space part between. Air exists in the voids, and the protrusions 14 are pressure-molded soft magnetic powders having electrical resistance. Since the magnetic permeability of air is smaller than the magnetic permeability of the soft magnetic powder, the magnetic field generated by the magnetic field generating means 20 shown in FIG. 4 is concentrated in the vicinity of the protrusion 14 and the magnetic flux density in the vicinity of the protrusion 14 is large. In addition, the magnetic flux density in the gap is reduced. Furthermore, if the density of the compact in the protrusion part 14 differs, according to the density, magnetic flux density will also change. That is, the greater the density of the green compact, the greater the magnetic flux density.

したがって、図５に示すように、０度，３０度，６０度，９０度の位置付近における磁束密度は、空隙部における磁束密度に比べて大きいとともに、突出部１４の密度に応じて変化する。   Therefore, as shown in FIG. 5, the magnetic flux density in the vicinity of the positions of 0 degrees, 30 degrees, 60 degrees, and 90 degrees is larger than the magnetic flux density in the gap and changes according to the density of the protrusions 14.

ここで、判定部６０は、検出された磁束密度が、ＭＩ−１〜ＭＩ−２の範囲を許容範囲としている。従って、図５に示す例では、角度０度，３０度，６０度，９０度，１５０度，１８０度，２１０度，２４０度，２７０度，３００度，３３０度における１１個の突出部の磁束密度は許容範囲内であるが、角度１２０度における突出部の磁束密度が許容範囲よりも小さいと判定できる。１２個の突出部の内、１カ所でも磁束密度が許容範囲よりも小さい、すなわち、その突出部の密度が許容範囲よりも小さいと判定されると、判定部６０は判定対象の圧粉磁心は密度不足の不合格品と判定する。判定結果は、表示手段７０に表示される。   Here, the determination unit 60 sets the detected magnetic flux density within the range of MI-1 to MI-2 as an allowable range. Therefore, in the example shown in FIG. 5, the magnetic flux of 11 protrusions at angles of 0 degrees, 30 degrees, 60 degrees, 90 degrees, 150 degrees, 180 degrees, 210 degrees, 240 degrees, 270 degrees, 300 degrees, and 330 degrees. Although the density is within the allowable range, it can be determined that the magnetic flux density of the protrusion at an angle of 120 degrees is smaller than the allowable range. If it is determined that the magnetic flux density is smaller than the allowable range even at one of the twelve protruding portions, that is, if the density of the protruding portion is smaller than the allowable range, the determining unit 60 determines the dust core to be determined. Judged as rejected product with insufficient density. The determination result is displayed on the display means 70.

以上説明したように、本実施形態によれば、磁気検出部によって圧粉鉄心の磁束密度を連続的に測定することによって、圧粉磁心の密度分布、特に密度が低くなると予想される突出部の密度を、非破壊で測定できる。したがって、圧粉磁心を非破壊で、全数検査可能となる。   As described above, according to the present embodiment, by continuously measuring the magnetic flux density of the dust core by the magnetic detection unit, the density distribution of the dust core, in particular, the protrusions that are expected to be reduced in density. Density can be measured non-destructively. Therefore, the dust core can be inspected in a non-destructive manner.

次に、図６を用いて、本発明の他の実施形態による圧粉成形体の密度分布測定装置の構成について説明する。
図６は、本発明の他の実施形態による圧粉成形体の密度分布測定装置の構成を示す平面図である。なお、図２と同一符号は、同一部分を示している。 Next, the configuration of a density distribution measuring device for a green compact according to another embodiment of the present invention will be described with reference to FIG.
FIG. 6 is a plan view showing a configuration of a density distribution measuring device for a green compact according to another embodiment of the present invention. The same reference numerals as those in FIG. 2 indicate the same parts.

圧粉磁心１０は、磁場発生手段２０の内周側に設置される。磁場発生手段２０は、リング状非磁性体２２と、リング状非磁性体２２の外周に巻回されたコイル２４とから構成されている。圧粉磁心１０及び磁場発生手段２０は、回転テーブル８０の上に設置される。   The dust core 10 is installed on the inner peripheral side of the magnetic field generating means 20. The magnetic field generating means 20 includes a ring-shaped nonmagnetic material 22 and a coil 24 wound around the outer periphery of the ring-shaped nonmagnetic material 22. The dust core 10 and the magnetic field generation means 20 are installed on the rotary table 80.

磁気検出部４０は、アーム４２Ａの先端に支持されている。磁気検出部４０は、例えば、ホール素子などが用いられ、磁気検出部４０の位置における磁束密度を検出する。磁気検出部４０は、圧粉鉄心１０の突出部１４の上に位置付けられている。また、アーム４２Ａは、シャフト４４Ａによって支持されているとともに、矢印Ｒ４方向に円弧運動可能である。   The magnetic detection unit 40 is supported at the tip of the arm 42A. For example, a Hall element is used as the magnetic detection unit 40 and detects the magnetic flux density at the position of the magnetic detection unit 40. The magnetic detection unit 40 is positioned on the protruding portion 14 of the dust core 10. The arm 42A is supported by the shaft 44A and is capable of circular motion in the direction of the arrow R4.

テーブル８０は、図示しないモータによって回転される。テーブル８０の回転によって、圧粉鉄心１０も回転し、その突出部は、順次磁気検出部４０の下を通過することで、磁束密度が検出される。検出した磁束密度の信号は、図３に示した信号検出部５０に取り込まれ、モータの回転角度θの信号と関連づけて、判定部６０に出力する。判定部６０は、検出された磁束密度に応じて、その値が所定範囲内であれば、突出部１４の密度が所定範囲内に収まっていると判定する。   The table 80 is rotated by a motor (not shown). The dust core 10 is also rotated by the rotation of the table 80, and the magnetic flux density is detected by the protrusions passing under the magnetic detection unit 40 sequentially. The detected magnetic flux density signal is taken into the signal detection unit 50 shown in FIG. 3, and is output to the determination unit 60 in association with the signal of the rotation angle θ of the motor. The determination unit 60 determines that the density of the protrusions 14 is within the predetermined range if the value is within the predetermined range according to the detected magnetic flux density.

以上説明したように、本実施形態によっても、磁気検出部によって圧粉鉄心の磁束密度を連続的に測定することによって、圧粉磁心の密度分布、特に密度が低くなると予想される突出部の密度を、非破壊で測定できる。したがって、圧粉磁心を非破壊で、全数検査可能となる。
As described above, according to the present embodiment as well, by continuously measuring the magnetic flux density of the dust core by the magnetic detection unit, the density distribution of the dust core, in particular, the density of the protrusions that are expected to be reduced. Can be measured nondestructively. Therefore, the dust core can be inspected in a non-destructive manner.

本発明の一実施形態による圧粉成形体の密度分布測定装置によって密度測定される圧粉磁心の構成を示す平面図である。It is a top view which shows the structure of the powder magnetic core by which density measurement is carried out with the density distribution measuring apparatus of the compacting body by one Embodiment of this invention. 本発明の一実施形態による圧粉成形体の密度分布測定装置の構成を示す平面図である。It is a top view which shows the structure of the density distribution measuring apparatus of the compacting body by one Embodiment of this invention. 本発明の一実施形態による圧粉成形体の密度分布測定装置の断面構成を示すシステムブロック図である。It is a system block diagram which shows the cross-sectional structure of the density distribution measuring apparatus of the compacting body by one Embodiment of this invention. 本発明の一実施形態による圧粉成形体の密度分布測定装置に用いる磁場発生手段の原理説明図である。It is principle explanatory drawing of the magnetic field generation means used for the density distribution measuring apparatus of the compacting body by one Embodiment of this invention. 本発明の一実施形態による圧粉成形体の密度分布測定装置によって検出された磁束密度の説明図である。It is explanatory drawing of the magnetic flux density detected by the density distribution measuring apparatus of the compacting body by one Embodiment of this invention. 本発明の他の実施形態による圧粉成形体の密度分布測定装置の構成を示す平面図である。It is a top view which shows the structure of the density distribution measuring apparatus of the compacting body by other embodiment of this invention.

符号の説明Explanation of symbols

１０…圧粉磁心
１２…リング部
１４…突出部
２０…磁場発生手段
２２…リング状非磁性体
２４…コイル
４０…磁気検出部
４６…モータ
４２…アーム
５０…信号検出部
６０…判定部
７０…表示部 DESCRIPTION OF SYMBOLS 10 ... Powder magnetic core 12 ... Ring part 14 ... Protrusion part 20 ... Magnetic field generation means 22 ... Ring-shaped nonmagnetic material 24 ... Coil 40 ... Magnetic detection part 46 ... Motor 42 ... Arm 50 ... Signal detection part 60 ... Determination part 70 ... Display section

Claims (6)

軟磁性粉末粒子間における渦電流を抑制し得る電気抵抗を有する軟磁性粉末にバインダー樹脂および潤滑剤を加えて加圧成形された圧粉磁心の密度分布を測定する圧粉成形体の密度分布測定方法において、
前記圧粉成形体である前記圧粉磁心に磁場を印加し、前記圧粉磁心の磁束密度を測定することにより、前記圧粉磁心の密度を測定することを特徴とする圧粉成形体の密度分布測定方法。 Density measurement of powder compacts that measures the density distribution of compacted magnetic cores formed by adding binder resin and lubricant to soft magnetic powders with electrical resistance that can suppress eddy currents between soft magnetic powder particles In the method
The density of the dust compact, wherein the density of the dust core is measured by applying a magnetic field to the dust core, which is the dust compact, and measuring the magnetic flux density of the dust core. Distribution measurement method. 請求項１記載の圧粉成形体の密度分布測定方法において、
前記圧粉磁心は、円環状のリング部と、このリング部から内径方向に突出した突出部とから構成され、
前記突出部の磁束密度から、密度を測定することを特徴とする圧粉成形体の密度分布測定方法。 In the density distribution measuring method of the compacting body according to claim 1,
The dust core is composed of an annular ring portion and a protruding portion protruding in an inner diameter direction from the ring portion,
A density distribution measuring method for a green compact, wherein the density is measured from the magnetic flux density of the protrusion. 軟磁性粉末粒子間における渦電流を抑制し得る電気抵抗を有する軟磁性粉末にバインダー樹脂および潤滑剤を加えて加圧成形された圧粉磁心の密度分布を測定する圧粉成形体の密度分布測定装置において、
磁場を発生する磁場発生手段と、
前記磁場発生手段により発生した磁場内に配置された前記圧粉成形体である前記圧粉磁心の磁束密度を測定する磁気検出部とを備え、
前記磁気検出部により検出された磁束密度により、前記圧粉磁心の密度を測定することを特徴とする圧粉成形体の密度分布測定装置。 Density measurement of powder compacts that measures the density distribution of compacted magnetic cores formed by adding binder resin and lubricant to soft magnetic powders with electrical resistance that can suppress eddy currents between soft magnetic powder particles In the device
Magnetic field generating means for generating a magnetic field;
A magnetic detection unit for measuring a magnetic flux density of the dust core which is the dust compact disposed in the magnetic field generated by the magnetic field generation means,
A density distribution measuring apparatus for a compacting body, wherein the density of the dust core is measured based on the magnetic flux density detected by the magnetism detecting unit. 請求項３記載の圧粉成形体の密度分布測定装置において、
前記圧粉磁心は、円環状のリング部と、このリング部から内径方向に突出した突出部とから構成され、
前記磁気検出部は、前記突出部の磁束密度から、密度を測定することを特徴とする圧粉成形体の密度分布測定装置。 In the density distribution measuring apparatus of the compacting body according to claim 3,
The dust core is composed of an annular ring portion and a protruding portion protruding in an inner diameter direction from the ring portion,
The said magnetic detection part measures a density from the magnetic flux density of the said protrusion part, The density distribution measuring apparatus of the compacting body characterized by the above-mentioned. 請求項４記載の圧粉成形体の密度分布測定装置において、
前記磁気検出部を取り付けるアームを備え、
前記アームを、前記リング部の中心を中心として回転させることを特徴とする圧粉成形体の密度分布測定装置。 In the density distribution measuring apparatus of the compacting body according to claim 4,
An arm for attaching the magnetic detection unit;
A density distribution measuring apparatus for a compacting body, wherein the arm is rotated about the center of the ring portion. 請求項４記載の圧粉成形体の密度分布測定装置において、
前記磁場発生手段を保持するテーブルを備え、
このテーブルを回転させることを特徴とする圧粉成形体の密度分布測定装置。 In the density distribution measuring apparatus of the compacting body according to claim 4,
A table for holding the magnetic field generating means;
An apparatus for measuring a density distribution of a green compact, wherein the table is rotated.
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JPH0198957A (en) * 1987-10-13 1989-04-17 Midori Anzen Kk Method and device for measuring mixing degree of mixed powder
JP2006180677A (en) * 2004-12-24 2006-07-06 Hitachi Metals Ltd Integrated skew magnetic rotor with core, and its manufacturing method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013061642A1 (en) * 2011-10-24 2013-05-02 Ｊｆｅスチール株式会社 Measuring method and measuring device for apparent density of metallic powder, production method and production device for mixed powder, and production method and production device for powder compact
EP2772754A1 (en) * 2011-10-24 2014-09-03 JFE Steel Corporation Measuring method and measuring device for apparent density of metallic powder, production method and production device for mixed powder, and production method and production device for powder compact
EP2772754A4 (en) * 2011-10-24 2015-01-07 Jfe Steel Corp Measuring method and measuring device for apparent density of metallic powder, production method and production device for mixed powder, and production method and production device for powder compact
US10092952B2 (en) 2011-10-24 2018-10-09 Jfe Steel Corporation Method and apparatus for measuring apparent density of metal powder, method and apparatus for producing mixed powder, and method and apparatus for producing powder compact

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