JP2007171121A - Steel material measuring coil - Google Patents

Steel material measuring coil Download PDF

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Publication number
JP2007171121A
JP2007171121A JP2005372723A JP2005372723A JP2007171121A JP 2007171121 A JP2007171121 A JP 2007171121A JP 2005372723 A JP2005372723 A JP 2005372723A JP 2005372723 A JP2005372723 A JP 2005372723A JP 2007171121 A JP2007171121 A JP 2007171121A
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Japan
Prior art keywords
coil
steel material
measuring coil
material measuring
measurement
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JP2005372723A
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Japanese (ja)
Inventor
Fumio Ogawa
二美夫 小川
Satoru Sakai
悟 坂井
Noriyoshi Takaoka
徳義 高岡
Takeshi Yoshikawa
毅 吉川
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NTN Corp
Neturen Co Ltd
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NTN Corp
Neturen Co Ltd
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Priority to JP2005372723A priority Critical patent/JP2007171121A/en
Publication of JP2007171121A publication Critical patent/JP2007171121A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel material measuring coil capable of enhancing measuring precision. <P>SOLUTION: In the steel material measuring coil 1 used by connection to an LCR meter, a coil winding 2 is surrounded by a magnetic body 3. The magnetic body 3 is a ringlike member having a groove part 3a of U-shaped cross-section opened in its inner peripheral side and the coil winding 2 is arranged in the groove part 3a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、ＬＣＲメータと接続して使用される鋼材測定コイルに関する。   The present invention relates to a steel material measuring coil used in connection with an LCR meter.

鋼材における硬化層深さの測定、未焼入れ品の判定、異材判定を非破壊で行う方法として、ＬＣＲメータとこれに接続したコイルを使用する方法が知られている。この方法では、コイルにシャフト状の鋼材試験片を挿入した状態で、ＬＣＲメータからコイルに交流電流を流して、そのときのコイルのインダクタンス値をＬＣＲメータで測定し、測定したインダクタンス値から鋼材試験片の上記測定・判定を行う。   As a method for performing non-destructive measurement of the hardened layer depth in steel materials, determination of unquenched products, and determination of different materials, a method using an LCR meter and a coil connected thereto is known. In this method, with a shaft-shaped steel material test piece inserted into the coil, an alternating current is passed from the LCR meter to the coil, the inductance value of the coil at that time is measured with the LCR meter, and the steel material test is performed from the measured inductance value. Perform the above measurement and judgment of the piece.

上記測定・判定方法の場合、コイルから発生する磁束を介してインダクタンス値の測定が行われるため、測定精度を高めるためには、コイルからある程度以上の大きな磁束を発生させる必要がある。しかし、市販のＬＣＲメータではコイルに出力できる電流値には制限があるので、電流値を大きしてコイルの発生磁束を大きくするには限界がある。   In the case of the measurement / determination method, since the inductance value is measured via the magnetic flux generated from the coil, it is necessary to generate a large magnetic flux of a certain level or more from the coil in order to increase the measurement accuracy. However, since a commercially available LCR meter has a limit on the current value that can be output to the coil, there is a limit in increasing the current value and increasing the magnetic flux generated by the coil.

この発明の目的は、測定精度を向上させることができる鋼材測定コイルを提供することである。   An object of the present invention is to provide a steel material measuring coil capable of improving measurement accuracy.

この発明の鋼材測定コイルは、ＬＣＲメータと接続して使用される鋼材測定コイルにおいて、コイル巻線を磁性体で囲んだことを特徴とする。
このようにコイル巻線を磁性体で囲むことで、コイルからの発生磁束を集中させることができる。そのため、測定精度を向上させることができる。 The steel material measuring coil of the present invention is a steel material measuring coil used in connection with an LCR meter, wherein the coil winding is surrounded by a magnetic material.
Thus, the magnetic flux generated from the coil can be concentrated by surrounding the coil winding with a magnetic material. Therefore, measurement accuracy can be improved.

この発明において、前記磁性体は、内周側に溝部が開口した断面Ｕ字状でリング状の部材であって、前記溝部内にコイル巻線を配置しても良い。この構成の場合、コイル巻線を安定良く磁性体で囲むことができる。   In the present invention, the magnetic body may be a ring-shaped member having a U-shaped cross-section with an opening on the inner peripheral side, and a coil winding may be disposed in the groove. In the case of this configuration, the coil winding can be stably surrounded by the magnetic material.

この発明の鋼材測定コイルは、鋼材の硬化層の深さの測定や、未焼入れの判定、または異材判定に用いられるものであっても良い。深さの測定や、未焼入れの判定、異材判定は、精度良くインダクタンス値を測定することが必要である。そのため、この発明の鋼材測定コイルの測定精度の向上効果が有効に発揮される。   The steel material measuring coil of the present invention may be used for measuring the depth of a hardened layer of steel material, determining whether it is unquenched, or determining a different material. For the depth measurement, the unquenched determination, and the foreign material determination, it is necessary to accurately measure the inductance value. Therefore, the effect of improving the measurement accuracy of the steel material measuring coil of the present invention is effectively exhibited.

この発明の鋼材測定コイルは、ＬＣＲメータと接続して使用される鋼材測定コイルにおいて、コイル巻線を磁性体で囲んだため、測定精度を向上させることができる。   In the steel material measuring coil of the present invention, since the coil winding is surrounded by a magnetic material in the steel material measuring coil used in connection with the LCR meter, the measurement accuracy can be improved.

この発明の一実施形態を図１ないし図４と共に説明する。図１（Ａ）はこの実施形態の鋼材測定コイルの平面図を、図１（Ｂ）は図１（Ａ）におけるＩ−Ｉ矢視断面図をそれぞれ示す。この鋼材測定コイル１は、図２に示すようにＬＣＲメータ４と接続して、鋼材の硬化層の深さ測定や、未焼入れ判定、または異材判定に使用するものである。ＬＣＲメータ４は、Ｌ（インダクタンス）、Ｃ（キャパシタンス）、およびＲ（レジスタンス）を測定する装置であり、これに接続されるコイルに交流電流を流し、コイルのインダクタンス値を測定可能な装置である。
この鋼材測定コイル１は、コイル巻線２を磁性体３で囲んだものである。磁性体３は、図１（Ｂ）のように内周側に溝部３ａが開口した断面Ｕ字状でリング状の部材であって、前記溝部３ａ内にコイル巻線２が配置される。このように、磁性体３の内周側に開口した溝部３ａ内にコイル巻線２を配置することにより、コイル巻線２を安定良く磁性体３で囲むことができる。磁性体３の材質としては、鋼材等が用いられる。 An embodiment of the present invention will be described with reference to FIGS. FIG. 1A shows a plan view of the steel material measuring coil of this embodiment, and FIG. 1B shows a cross-sectional view taken along the line II in FIG. This steel material measuring coil 1 is connected to an LCR meter 4 as shown in FIG. 2 and is used for measuring the depth of a hardened layer of steel material, determining whether it is unquenched, or determining a different material. The LCR meter 4 is a device that measures L (inductance), C (capacitance), and R (resistance), and is a device that can measure an inductance value of a coil by passing an alternating current through a coil connected thereto. .
This steel measuring coil 1 is obtained by surrounding a coil winding 2 with a magnetic body 3. As shown in FIG. 1B, the magnetic body 3 is a ring-shaped member having a U-shaped cross section in which a groove 3a is opened on the inner peripheral side, and the coil winding 2 is disposed in the groove 3a. As described above, the coil winding 2 can be stably surrounded by the magnetic body 3 by disposing the coil winding 2 in the groove portion 3 a opened on the inner peripheral side of the magnetic body 3. As the material of the magnetic body 3, steel material or the like is used.

この鋼材測定コイル１を用いた鋼材の硬化層深さ測定、未焼入れ品の判定、異材の判定などは、図２のように行われる。すなわち、この鋼材測定コイル１をＬＣＲメータ４に接続し、コイル１にシャフト状の鋼材試験片５を挿入した状態で、ＬＣＲメータ４からコイル１に交流電流を流し、そのときのコイル１のインダクタンス値をＬＣＲメータ４で測定することにより行われる。   Measurement of the hardened layer depth of the steel material using this steel material measuring coil 1, determination of an unquenched product, determination of a different material, etc. are performed as shown in FIG. That is, with this steel material measuring coil 1 connected to the LCR meter 4 and a shaft-shaped steel material test piece 5 inserted in the coil 1, an alternating current is passed from the LCR meter 4 to the coil 1, and the inductance of the coil 1 at that time This is done by measuring the value with the LCR meter 4.

図３は、この鋼材測定コイル１を図２の測定系に用いて測定したコイル１のインダクタンス値と、鋼材試験片５の硬化層深さとの関係を調査した結果を示すグラフである。これに対して、図４は、コイル巻線を磁性体で囲まない従来の鋼材測定コイルを図２の測定系に用いて測定したコイルのインダクタンス値と、鋼材試験片５の硬化層深さとの関係を調査した結果を示すグラフである。これらのグラフにおけるインダクタンス値と硬化層深さの一次回帰式は、次のようになっている。
（１）実施形態の鋼材測定コイル１を用いた場合（図３）
ｙ＝−０．２０９ｘ＋４７．２（ｘ＝インダクタンス値（mH），ｙ＝硬化層深さ（mm） ，（相関係数Ｒ）2 ＝１．０００）
（２）従来例のコイル（コイル巻線を磁性体で囲まない）を用いた場合（図４）
ｙ＝−０．２５８ｘ＋３４．４（ｘ＝インダクタンス値（mH），ｙ＝硬化層深さ（mm） ，（相関係数Ｒ）2 ＝０．９９１） FIG. 3 is a graph showing a result of investigating the relationship between the inductance value of the coil 1 measured using the steel material measuring coil 1 in the measurement system of FIG. 2 and the hardened layer depth of the steel material test piece 5. On the other hand, FIG. 4 shows the inductance value of a coil measured using a conventional steel material measurement coil in which the coil winding is not surrounded by a magnetic material in the measurement system of FIG. 2 and the hardened layer depth of the steel material test piece 5. It is a graph which shows the result of having investigated the relationship. The linear regression equations of the inductance value and the hardened layer depth in these graphs are as follows.
(1) When the steel material measuring coil 1 of the embodiment is used (FIG. 3)
y = −0.209x + 47.2 (x = inductance value (mH), y = hardened layer depth (mm), (correlation coefficient R) 2 = 1.000)
(2) When a conventional coil (coil winding is not surrounded by a magnetic material) is used (FIG. 4)
y = −0.258x + 34.4 (x = inductance value (mH), y = hardened layer depth (mm), (correlation coefficient R) 2 = 0.991)

この測定結果から、従来例の鋼材測定コイルに較べて、実施形態の鋼材測定コイル１を用いた場合の方が一次回帰式の傾き（mm/mH ）が小さく、インダクタンス値の変化量に対して硬化層深さの変化量が小さくなっており、測定分解能が向上していることが分かる。これは、実施形態の鋼材測定コイル１では、コイル巻線２を磁性体３で囲んでいることから、コイル１からの発生磁束を集中させることができることによる。
なお、上記調査はインダクタンス値と硬化層深さの関係について行ったものであるが、インダクタンス値と未焼入れ品の関係や、インダクタンス値と異材の関係について行った調査でも、実施形態の鋼材測定コイル１を用いた場合の方が、従来例のコイルを用いた場合よりも測定分解能を向上させることができることが確認された。 From this measurement result, the slope (mm / mH) of the linear regression equation is smaller when the steel measurement coil 1 of the embodiment is used than the steel measurement coil of the conventional example, and with respect to the amount of change in the inductance value. It can be seen that the amount of change in the hardened layer depth is small and the measurement resolution is improved. This is because in the steel material measuring coil 1 of the embodiment, since the coil winding 2 is surrounded by the magnetic body 3, the generated magnetic flux from the coil 1 can be concentrated.
Although the above investigation was conducted on the relationship between the inductance value and the hardened layer depth, the steel material measuring coil of the embodiment was also examined in the investigation conducted on the relationship between the inductance value and the unquenched product, and the relationship between the inductance value and the different material. It was confirmed that the measurement resolution can be improved when 1 is used compared to when the conventional coil is used.

このように、この実施形態の鋼材測定コイル１をＬＣＲメータ４に接続して、鋼材の硬化層深さの測定や、未焼入れ品の判定、あるいは異材判定を行った場合、従来例の鋼材測定コイルを用いた場合に較べて測定精度を向上させることができる。   As described above, when the steel material measuring coil 1 of this embodiment is connected to the LCR meter 4 to measure the hardened layer depth of the steel material, to determine the unquenched product, or to determine the different material, the steel material measurement of the conventional example is performed. Measurement accuracy can be improved as compared with the case where a coil is used.

（Ａ）はこの発明の一実施形態にかかる鋼材測定コイルの平面図、（Ｂ）は同図（Ａ）におけるＩ−Ｉ矢視断面図である。(A) is a top view of the steel material measuring coil concerning one Embodiment of this invention, (B) is the II arrow directional cross-sectional view in the figure (A). 同鋼材測定コイルが用いられる測定系の説明図である。It is explanatory drawing of the measurement system in which the same steel material measuring coil is used. 図２の測定系に実施形態のコイルを用いて測定したインダクタンス値と鋼材硬化層深さの関係を示すグラフである。It is a graph which shows the relationship between the inductance value measured using the coil of embodiment in the measurement system of FIG. 2, and steel material hardened layer depth. 図２の測定系に従来例のコイルを用いて測定したインダクタンス値と鋼材硬化層深さの関係を示すグラフである。It is a graph which shows the relationship between the inductance value measured using the coil of the prior art example in the measuring system of FIG. 2, and steel material hardened layer depth.

符号の説明Explanation of symbols

１…鋼材測定コイル
２…コイル巻線
３…磁性体
３ａ…溝部 DESCRIPTION OF SYMBOLS 1 ... Steel measuring coil 2 ... Coil winding 3 ... Magnetic body 3a ... Groove part

Claims (3)

ＬＣＲメータと接続して使用される鋼材測定コイルにおいて、コイル巻線を磁性体で囲んだことを特徴とする鋼材測定コイル。   A steel material measuring coil used in connection with an LCR meter, wherein the coil winding is surrounded by a magnetic material. 請求項１において、前記磁性体は、内周側に溝部が開口した断面Ｕ字状でリング状の部材であって、前記溝部内にコイル巻線を配置した鋼材測定コイル。   2. The steel material measuring coil according to claim 1, wherein the magnetic body is a ring-shaped member having a U-shaped cross section with a groove opening on an inner peripheral side, and a coil winding is disposed in the groove. 請求項１または請求項２において、鋼材の硬化層の深さの測定、未焼入れの判定、または異材判定に用いられるものである鋼材測定コイル。   The steel material measuring coil according to claim 1 or 2, wherein the steel material measuring coil is used for measurement of a depth of a hardened layer of steel material, determination of unquenched, or determination of a different material.
JP2005372723A 2005-12-26 2005-12-26 Steel material measuring coil Pending JP2007171121A (en)

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