JPS63169552A - Inspecting method for quenching quality of directly quenched rod steel - Google Patents
Inspecting method for quenching quality of directly quenched rod steelInfo
- Publication number
- JPS63169552A JPS63169552A JP207287A JP207287A JPS63169552A JP S63169552 A JPS63169552 A JP S63169552A JP 207287 A JP207287 A JP 207287A JP 207287 A JP207287 A JP 207287A JP S63169552 A JPS63169552 A JP S63169552A
- Authority
- JP
- Japan
- Prior art keywords
- master
- rod steel
- steel bar
- directly
- quality
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 34
- 239000010959 steel Substances 0.000 title claims abstract description 34
- 238000010791 quenching Methods 0.000 title claims abstract description 19
- 230000000171 quenching effect Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 8
- 239000000463 material Substances 0.000 claims abstract description 30
- 238000007689 inspection Methods 0.000 claims abstract description 16
- 238000005098 hot rolling Methods 0.000 claims description 4
- 229910000760 Hardened steel Inorganic materials 0.000 description 17
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、直接焼入棒鋼に渦電流を発生さゼることに
より得られるインピーダンス値に基づいて検査を行なう
直接焼入棒鋼の焼入品位検査方法に関する。Detailed Description of the Invention (Field of Industrial Application) This invention is directed to the quenching quality of a directly quenched steel bar, which is inspected based on the impedance value obtained by generating an eddy current in the quenched steel bar. Regarding inspection methods.
（従来の技術とその問題点）
焼入棒鋼の品質検査を行なうに当り、棒鋼の端末から試
料片を採取し、硬さ１組織、焼入れ深さ等を観察する方
法が従来から行なわれており、この方法によれば手数は
かかるが、精度の高い検査が行なえる。(Prior art and its problems) When inspecting the quality of hardened steel bars, the conventional method has been to take a sample piece from the end of the steel bar and observe the hardness, microstructure, hardening depth, etc. Although this method is time-consuming, it allows for highly accurate inspection.
ところが近年、生産性向上のため、熱間圧延後オンライ
ン上にて直ちに焼入処理を行なう棒鋼〈直接焼入棒１１
４）の製造方法が採用されつつあり、このような直接焼
入棒鋼の製造方法は未だ完全には確立されておらないと
ころから、最適な圧延条件、水冷条件、ラインスピード
等を求めるために数多くの実験を繰返したり、その結束
前られた直接焼入棒鋼の焼入品位の検討や製造ラインへ
のフィードバックが必要となる。このため、直接焼入棒
鋼の品質検査は高精度かつ高速性を要求されるが、上記
した方法では判定までに長時間を要するので、製造ライ
ンへのフィードバックを迅速に行なうことができず、ま
た作業で１荷が太さい等の問題点があった。However, in recent years, in order to improve productivity, steel bars that undergo online quenching treatment immediately after hot rolling (directly quenched bar 11) have been developed.
The manufacturing method of 4) is being adopted, and as this manufacturing method of directly quenched steel bars has not yet been fully established, numerous tests have been carried out to find the optimal rolling conditions, water cooling conditions, line speed, etc. It is necessary to repeat the experiment, examine the quenching quality of the directly quenched steel bar before bundling, and provide feedback to the production line. For this reason, quality inspection of directly hardened steel bars requires high precision and high speed, but the above method requires a long time to make a judgment, making it impossible to quickly provide feedback to the production line. There were problems with the work, such as one load being too thick.
（発明の目的）
この発明の目的は、上記従来技術の問題点を解消し、直
接焼入棒鋼の品質検査において、高速で、かつ精度よく
検査のできる直接焼入棒鋼の焼入品位検査方法を簡単な
構成で、提供することである。(Objective of the Invention) The object of the present invention is to solve the problems of the above-mentioned prior art and to provide a method for inspecting the quenching quality of directly quenched steel bars that can be inspected at high speed and with high accuracy. The purpose is to provide a simple configuration.
（目的を達成するための手段）
上記目的を達成するため、この発明による直接焼入棒鋼
の焼入品位検査方法は、熱間圧延後オンライン上にて焼
入処理された直接焼入棒鋼に渦電流を発生させ、そのイ
ンピーダンス値を測定することにより前記直接焼入棒鋼
の焼入品位を非破壊にて検査する際に、或に焼入処理さ
れた所望の品位のマスター材を同時測定しつつ、その相
対値に基づき前記直接焼入棒鋼の検査を行なうようにし
ている。(Means for Achieving the Object) In order to achieve the above object, the method for inspecting the quenching quality of a directly quenched steel bar according to the present invention provides a quenching quality inspection method for a directly quenched steel bar that has been quenched online after hot rolling. When nondestructively inspecting the quenching quality of the directly quenched steel bar by generating an electric current and measuring its impedance value, it is also possible to simultaneously measure the quenched master material of the desired grade. , the directly hardened steel bar is inspected based on the relative values.
（実施例）
第１図は、この発明の一実施例で用いられる直接焼入棒
鋼検査装置を示す概略説明図である。同図において、被
検査材である直接焼入棒鋼１をローラテーブル２にて移
動させており、この直接焼入棒鋼１の移動経路上に検査
コイル３を設ける。(Example) FIG. 1 is a schematic explanatory diagram showing a direct hardened steel bar inspection apparatus used in an example of the present invention. In the figure, a directly hardened steel bar 1, which is a material to be inspected, is moved on a roller table 2, and an inspection coil 3 is provided on the moving path of this directly hardened steel bar 1.
一方、別途にマスターコイル４が、マスター材５のイン
ピーダンス値を測定するように設けられている。マスタ
ー材５は、材質（化学成分）、形状（内径）を直接焼入
棒ｔＪ４１と同じものとしている。On the other hand, a master coil 4 is separately provided to measure the impedance value of the master material 5. The master material 5 has the same material (chemical composition) and shape (inner diameter) as the directly hardened rod tJ41.
さらにマスター材５は破壊試験等によりその品位（硬さ
２組織等）が良品であることを確認流のものである。ま
た、上記した検査コイル３．マスターコイル４は各々渦
流装置６に接続線１３．１４により電気的に接続されて
いる。Further, the quality of the master material 5 (hardness 2 structure, etc.) has been confirmed to be good by destructive tests and the like. In addition, the above-mentioned inspection coil 3. The master coils 4 are each electrically connected to the eddy current device 6 by a connecting line 13,14.
このような構成において、渦流装置６により、検査コイ
ル３及びマスターコイル４をされぞれ貫通した直接焼入
棒鋼１及びマスター材５に所定の周波数で渦電流を発生
させる。材料の組織または硬さと磁気的特性には関係が
あって、被検査材である直接焼入棒鋼１は常に標準試料
のマスター材５と比較され、その差としてインピーダン
スが測定される。すなわち各々の透磁率、Ｓ電率等によ
り変化するインピーダンス値を渦流装置６にて比較し、
その差（振幅差Ａ２位相差θ）を指示値として、第２図
に示すようにベクトル量でＣＲＴあるいはプロッタ等に
より表示する。この時、周波数を低い周波数から高い周
波数に変化させ、材料評価に適切な周波数を見つけ出し
、直接焼入棒鋼１の品位を評価する。なお上記表示され
るベクトル量はＸ成分、ｙ成分に分解することも出来る
。In such a configuration, the eddy current device 6 generates eddy currents at a predetermined frequency in the directly hardened steel bar 1 and the master material 5 that have passed through the inspection coil 3 and master coil 4, respectively. There is a relationship between the structure or hardness of the material and its magnetic properties, and the directly hardened steel bar 1, which is the material to be inspected, is always compared with the master material 5, which is a standard sample, and the impedance is measured as the difference. In other words, the eddy current device 6 compares the impedance values that change depending on each magnetic permeability, S electric rate, etc.
The difference (amplitude difference A2 phase difference θ) is used as an instruction value and is displayed as a vector quantity on a CRT or a plotter as shown in FIG. At this time, the frequency is changed from a low frequency to a high frequency, a frequency suitable for material evaluation is found, and the quality of the directly hardened steel bar 1 is evaluated. Note that the vector quantity displayed above can also be decomposed into an X component and a y component.
このように渦流装置６により、熱間圧延後のオンライン
上において、焼入処理された直接焼入棒！１１１の焼入
品位を検査することにより、リアルタイムで直接焼入棒
鋼１の焼入品位を知ることが可能となり、例えば直接焼
入棒鋼の製造方法確立のためのフィードバックが迅速に
行なうことができるようになる。In this way, the directly quenched rod is quenched online after hot rolling using the vortex device 6! By inspecting the quenching quality of 111, it is possible to know the quenching quality of the directly quenched steel bar 1 in real time, and, for example, it is possible to quickly provide feedback for establishing a manufacturing method for directly quenched steel bar 1. become.
Ｏ実験例
以下にこの発明の上記した実施例による実験結果を記述
する。試供（サンプル〉鋼として、クロムモリブデン鋼
ＳＣＭ４３５の直径３３＃１１＋のものを直接焼入棒鋼
１及びマスター材５として用いた。O Experimental Examples Experimental results according to the above-described embodiments of the present invention will be described below. Sample (Sample) Chrome-molybdenum steel SCM435 with a diameter of 33#11+ was used as the directly quenched steel bar 1 and the master material 5.
このうちマスター材５は、その表層部がマルテンサイト
化し、かつそのマルテンサイト組織は内部の保有熱によ
って焼きもどしされた状態になり、焼きもどしマルテン
サイト組織になるような焼入条件にて予め焼入れしてい
る。一方、被検査材としての直接焼入棒鋼１は、熱間圧
延後のオンライン上において様々な条件下（圧延条件、
水冷条件。Among these, the master material 5 is pre-quenched under quenching conditions such that its surface layer becomes martensite, and the martensite structure is tempered by internal heat, resulting in a tempered martensite structure. are doing. On the other hand, the directly quenched steel bar 1 as the material to be inspected is tested online under various conditions (rolling conditions,
water cooling conditions.
ラインスピード等）で焼入処理を行なった結果得られた
まず数種のものを、オンライン上にて適用する。得られ
た直接焼入棒鋼１および予め準備したマスター材５に、
各々検査コイル３．マスターコイル４を介して渦流装置
６により周波数２５Ｈ２（この場合の最適周波数）の渦
流を発生させ、その時に生じる直接焼入棒鋼１及びマス
ター材５のインピーダンス値の差を、電圧レベルに変換
する。この電圧値は前述したように振幅及び位相をパラ
メータとした指示値（ベクトル量）として出力される。First, several types of products obtained as a result of quenching at a line speed, etc.) are applied online. To the obtained directly quenched steel bar 1 and the master material 5 prepared in advance,
Each inspection coil 3. An eddy current with a frequency of 25H2 (optimal frequency in this case) is generated by the eddy current device 6 via the master coil 4, and the difference in impedance value between the directly hardened steel bar 1 and the master material 5 that occurs at this time is converted into a voltage level. As described above, this voltage value is output as an instruction value (vector quantity) using the amplitude and phase as parameters.
第３図は、この実験による指示値のｙ成分と直接焼入棒
鋼１の表面から１．５慣点の硬さく＋−（、）の関係を
測定したグラフである。同図において、マーク■、 ＋
、 ＠、◇、×は各々直接焼入棒鋼１の焼入条件が異な
っているサンプル鋼８１〜Ｓ５を示し、各マークがそれ
ぞれ複数あるのは各サンプル鋼８１〜Ｓ５のそれぞれ５
箇所程度の測定点で観察した結果を示している。また第
４図は位相（θ）と直接焼入棒鋼１の表面から１．５ａ
ｍ点の硬さくＨｖ）の関係を測定したグラフである。第
３図、第４図より明らかなように各サンプル鋼＄１〜Ｓ
５の指示値の“ｙ成分−硬さ″及び“位相−硬さ”の相
関関係はほぼ線形関係を示しており、定邑的に指示値に
より焼入硬さが把握できることがわかる。これは主に、
マスター材５として、材質、形状が直接焼入棒鋼１と同
じで、かつ所望の理想的な品質（硬さ１組織）の状態で
既に焼入処理された焼入棒鋼を用いたことに起因してい
ると考えられる。したがってマスター材５としては、で
きる限り上述の条件に近いものを用いることが望ましい
。また、マスター材５と直接焼入棒鋼１の材質、形状を
同じにすることで、渦流装置６による指示値が、直接焼
入棒鋼１の化学成分、内径の違いによる影響を受けにく
くなったということも考えられる。FIG. 3 is a graph showing the relationship between the y component of the indicated value and the hardness +-(,) at 1.5 points of inertia from the surface of the directly hardened steel bar 1 based on this experiment. In the same figure, marks ■, +
, @, ◇, and × each indicate sample steels 81 to S5 in which the quenching conditions of directly quenched steel bar 1 are different, and those with multiple marks each indicate 5 samples of each sample steel 81 to S5.
The results are shown based on observations at several measurement points. Figure 4 also shows the phase (θ) and 1.5a from the surface of directly hardened steel bar 1.
It is a graph obtained by measuring the relationship between hardness (Hv) at point m. As is clear from Figures 3 and 4, each sample steel $1~S
The correlation between "y component-hardness" and "phase-hardness" of the indicated values in No. 5 shows a nearly linear relationship, and it can be seen that the quenching hardness can be determined from the indicated values in a fixed manner. This is mainly
This is due to the fact that the master material 5 is a hardened steel bar that has the same material and shape as the directly hardened steel bar 1, and that has already been hardened to the desired ideal quality (hardness 1 structure). It is thought that Therefore, it is desirable to use a master material 5 that meets the above-mentioned conditions as closely as possible. In addition, by making the material and shape of the master material 5 and the directly hardened steel bar 1 the same, the values indicated by the vortex device 6 are less susceptible to differences in the chemical composition and inner diameter of the directly hardened steel bar 1. It is also possible.
（発明の効果）
以上説明したように、この発明によれば、直接焼入棒鋼
の焼入位検査において、既に焼入処理された所望の品質
のマスター材と比較した値を測定値とすることで信頼性
の高い測定値を高速で得ることができ、例えば直接焼入
棒鋼の製造方法の確立に資することができる。(Effects of the Invention) As explained above, according to the present invention, in the quenching position inspection of a directly quenched steel bar, the measured value is a value compared with a master material of a desired quality that has already been quenched. It is possible to obtain highly reliable measured values at high speed, which can contribute to the establishment of a method for producing directly hardened steel bars, for example.
第１図は、この発明の一実施例に用いられる直接焼入棒
鋼検査装置の概略説明図、第２図は渦流＃１Ｎ置による
指示値を示す説明図、第３図、第４図は各々この発明の
一実験結果であり、指示値のｙ成分−硬ざ２位相−硬さ
の相関関係を示すグラフである。Fig. 1 is a schematic explanatory diagram of a direct hardening steel bar inspection device used in an embodiment of the present invention, Fig. 2 is an explanatory diagram showing indicated values by the vortex #1N position, and Figs. 3 and 4 are respectively This is an experimental result of the present invention, and is a graph showing the correlation between the y component of the indicated value, the two phases of the hardness, and the hardness.
Claims (1)
焼入棒鋼に渦電流を発生させ、そのインピーダンス値を
測定することにより前記直接焼入棒鋼の焼入品位を非破
壊にて検査する際に、既に焼入処理された所望の品位の
マスター材を同時測定しつつ、その相対値に基づき前記
直接焼入棒鋼の検査を行なうことを特徴とする直接焼入
棒鋼の焼入品位検査方法。(1) Non-destructively inspect the quenching quality of the directly quenched steel bar by generating an eddy current in the directly quenched steel bar that has been quenched online after hot rolling and measuring its impedance value. A quenching quality inspection of a directly quenched steel bar, characterized in that the quenching quality inspection of a directly quenched steel bar is carried out based on the relative values while simultaneously measuring a master material of a desired grade that has already been quenched. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP207287A JPS63169552A (en) | 1987-01-08 | 1987-01-08 | Inspecting method for quenching quality of directly quenched rod steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP207287A JPS63169552A (en) | 1987-01-08 | 1987-01-08 | Inspecting method for quenching quality of directly quenched rod steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63169552A true JPS63169552A (en) | 1988-07-13 |
Family
ID=11519136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP207287A Pending JPS63169552A (en) | 1987-01-08 | 1987-01-08 | Inspecting method for quenching quality of directly quenched rod steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63169552A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008170233A (en) * | 2007-01-10 | 2008-07-24 | Toyota Motor Corp | Hardening depth measuring instrument and method |
-
1987
- 1987-01-08 JP JP207287A patent/JPS63169552A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008170233A (en) * | 2007-01-10 | 2008-07-24 | Toyota Motor Corp | Hardening depth measuring instrument and method |
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