JPH0141217B2 - - Google Patents
Info
- Publication number
- JPH0141217B2 JPH0141217B2 JP2055983A JP2055983A JPH0141217B2 JP H0141217 B2 JPH0141217 B2 JP H0141217B2 JP 2055983 A JP2055983 A JP 2055983A JP 2055983 A JP2055983 A JP 2055983A JP H0141217 B2 JPH0141217 B2 JP H0141217B2
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- hardness
- strength
- residual magnetism
- electromagnet
- 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.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 78
- 239000010959 steel Substances 0.000 claims description 78
- 230000005389 magnetism Effects 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 13
- 229920006395 saturated elastomer Polymers 0.000 claims description 11
- 238000007542 hardness measurement Methods 0.000 claims description 10
- 230000005415 magnetization Effects 0.000 description 11
- 239000013078 crystal Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 4
- 239000007779 soft material Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Description
【発明の詳細な説明】
本発明は、鋼板のオンライン硬度測定方法に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an online hardness measurement method for steel plates.
一般に、冷延鋼板等の硬度は、その磁気的性質
等に関係があることから、その機械的性質の管理
要素としてよく用いられている。 In general, the hardness of cold-rolled steel sheets and the like is often used as a control factor for its mechanical properties because it is related to its magnetic properties and the like.
従来、このような鋼板の硬度をオンラインで非
破壊的にその全長にわたつて連続的に測定可能と
すべく、鋼板の磁気的性質と硬度との相関関係に
着目した各種の硬度測定方法が提案されている。 In the past, various hardness measurement methods have been proposed that focus on the correlation between the magnetic properties of steel plates and hardness, in order to be able to continuously measure the hardness of steel plates online and non-destructively over their entire length. has been done.
本出願人は、特願昭56−200135号に添付した明
細書および図面において、「鋼板と直流励磁の電
磁石とを、相対移動状態下で対向配置するととも
に、電磁石の正負両磁極を上記相対移動方向に隔
置し、電磁石の一方の磁極によつて飽和磁化され
た鋼板部分を、電磁石の他方の磁極によつて逆方
向に飽和磁化し、上記飽和磁化された部分の残留
磁気の強さを測定し、測定された残留磁気の強さ
に基づいて該部分の硬度を求める鋼板のオンライ
ン硬度測定方法」を既に提案している。 In the specification and drawings attached to Japanese Patent Application No. 56-200135, the present applicant states that ``a steel plate and a DC-excited electromagnet are arranged facing each other in a state of relative movement, and both positive and negative magnetic poles of the electromagnet are moved relative to each other. A steel plate portion that is spaced apart in the direction and saturated magnetized by one magnetic pole of the electromagnet is saturated in the opposite direction by the other magnetic pole of the electromagnet, and the strength of the residual magnetism of the saturated magnetized portion is determined. We have already proposed an online hardness measurement method for steel plates in which the hardness of the part is determined based on the strength of the measured residual magnetism.
上記本出願人が既に提案している硬度測定方法
によれば、鋼板を挟みつける方式でないことか
ら、搬送ローラー等に密着して通板せしめられる
鋼板に測定装置を対向配置することが可能とな
り、鋼板パスラインの変動に対して測定精度にバ
ラツキを生ずることがない。また、鋼板を挟んで
磁化するものでなく、鋼板を飽和磁化することが
可能となる。 According to the hardness measuring method already proposed by the applicant, since the method does not involve sandwiching the steel plate, it is possible to place the measuring device opposite to the steel plate that is passed closely to a conveyor roller, etc. There is no variation in measurement accuracy due to variations in the steel plate pass line. Furthermore, instead of magnetizing the steel plate by sandwiching the steel plate, it becomes possible to saturate the steel plate.
上記本出願人が既に提案している硬度測定方法
による硬度計出力とロツクウエル硬度との相関関
係は、例えば第１図に示す通りであり、その測定
精度はロツクウエル硬度（HR30T）で±５であ
る。しかしながら、上記本出願人が既に提案して
いる硬度測定方法は、例えばロツクウエル硬度で
±２の測定精度が必要とされている焼鈍炉の製品
に対する規格判定に用いることができない。 The correlation between the hardness meter output and Rockwell hardness according to the hardness measurement method already proposed by the applicant is as shown in Figure 1, for example, and the measurement accuracy is ±5 for Rockwell hardness (H R 30T). It is. However, the hardness measuring method already proposed by the applicant cannot be used for standard determination of products of annealing furnaces, which require a measurement accuracy of ±2 in terms of Rockwell hardness, for example.
本発明は、鋼板の硬度をより高精度に測定可能
とするオンライン硬度測定方法を提供することを
目的とする。 An object of the present invention is to provide an online hardness measurement method that enables the hardness of a steel plate to be measured with higher precision.
上記目的を達成するために、本発明に係る鋼板
のオンライン硬度測定方法は、鋼板と直流励磁の
電磁石とを、相対移動状態下で対向配置するとと
もに、電磁石の正負両磁極を上記相対移動方向に
隔置し、電磁石の一方の磁極によつて飽和磁化さ
れた鋼板部分を、電磁石の他方の磁極によつて逆
方向に飽和磁化し、上記飽和磁化された鋼板部分
の残留磁気の強さを測定し、予め定めた鋼板の板
厚と上記残留磁気の強さと鋼板の硬度との相関関
係に基づき、該鋼板部分の硬度を求めるようにし
たものである。 In order to achieve the above object, the online hardness measurement method for a steel plate according to the present invention involves arranging a steel plate and a DC-excited electromagnet to face each other in a state of relative movement, and aligning both the positive and negative magnetic poles of the electromagnet in the direction of the relative movement. A steel plate part that is spaced apart and saturated magnetized by one magnetic pole of the electromagnet is saturated in the opposite direction by the other magnetic pole of the electromagnet, and the strength of the residual magnetism of the saturated magnetized steel plate part is measured. However, the hardness of the steel plate portion is determined based on the correlation between the predetermined thickness of the steel plate, the strength of the residual magnetism, and the hardness of the steel plate.
以下、本発明をより具体的に説明する。 The present invention will be explained in more detail below.
第２図は、本発明の実施に用いられる測定装置
を示す説明図である。連続的に走行する鋼板１の
表面に対して、直流励磁の電磁石２を対向配置す
るとともに、電磁石の正磁極（Ｎ極）と負磁極
（Ｓ極）とを鋼板１の走行方向において隔置する。
したがつて、鋼板１の任意の測定点Ｐは、電磁石
２の正磁極から負磁極に発生する磁力線３の影響
下を移動することとなり、位置Ａないし位置Ｅに
おいて、第３図に示す履歴に従つて順次着磁され
る。第３図は横軸に着磁する磁界の強さＸをと
り、縦軸に着磁されたことによつて鋼板１に残留
する磁界の密度Ｙを示すものであり、鋼板１は、
位置Ａに進入する以前に磁化されていても、位置
Ｂで正磁極によつて飽和磁化されて消磁され、そ
の後位置Ｄで負磁極によつて逆方向に飽和磁化さ
れ、最終的には位置Ｅにおいて残留磁気を保有す
る。このようにして電磁石２の磁力線影響下を通
過し、残留磁気を保有する鋼板１は、その残留磁
気の強さを検出器４によつて検出される。 FIG. 2 is an explanatory diagram showing a measuring device used in implementing the present invention. A DC-excited electromagnet 2 is arranged to face the surface of a continuously running steel plate 1, and the positive magnetic pole (N pole) and negative magnetic pole (S pole) of the electromagnet are spaced apart in the running direction of the steel plate 1. .
Therefore, any measurement point P on the steel plate 1 will move under the influence of the magnetic lines of force 3 generated from the positive magnetic pole to the negative magnetic pole of the electromagnet 2, and at positions A to E, the history shown in FIG. Therefore, they are sequentially magnetized. In Figure 3, the horizontal axis represents the strength X of the magnetic field for magnetization, and the vertical axis represents the density Y of the magnetic field remaining in the steel plate 1 due to magnetization.
Even if it is magnetized before entering position A, it will be saturated magnetized and demagnetized by the positive magnetic pole at position B, then saturated magnetized in the opposite direction by the negative magnetic pole at position D, and finally at position E. It has residual magnetism at In this way, the steel plate 1 passing under the influence of the magnetic field lines of the electromagnet 2 and having residual magnetism has the strength of the residual magnetism detected by the detector 4.
第４図は上記鋼板１における実際の磁化状態を
示す説明図である。第４図において位置Ａにおけ
る鋼板１のスピン（磁化の方向）は全くランダム
な方向を向いている。この鋼板１が位置Ｃに来る
と、正磁極と負磁極の中間となり、鋼板１の進行
方向に対して強い外部磁界が与えられることにな
るため、鋼板１のスピンは、一方向に整列する。
その後鋼板１が位置Ｄに来ると、鋼板１のスピン
は全て上向きとなり、また鋼板１が位置Ｅに来る
と上向きとなつたスピンがランダムな方向に戻ろ
うとする。軟質材（焼鈍材）１Ａに対してはこの
スピンの向きが容易に変わり、硬質材（未焼鈍
材）１Ｂに対してはこのスピンの向きが容易に戻
らない。この磁化状態を、横軸に着磁する磁界の
強さＸをとり、縦軸に鋼板１Ａ，１Ｂに残留する
磁界の密度Ｙをとつて示せば第５図の通りとな
る。検出器４は、鋼板１Ａ，１Ｂに対し、それぞ
れ第５図のYA点、YB点示す残留磁気の強さを検
出する。 FIG. 4 is an explanatory diagram showing the actual magnetization state of the steel plate 1. As shown in FIG. In FIG. 4, the spin (direction of magnetization) of the steel plate 1 at position A is completely random. When this steel plate 1 comes to position C, it becomes intermediate between the positive magnetic pole and the negative magnetic pole, and a strong external magnetic field is applied to the traveling direction of the steel plate 1, so that the spins of the steel plate 1 are aligned in one direction.
After that, when the steel plate 1 comes to position D, all the spins of the steel plate 1 become upward, and when the steel plate 1 comes to position E, the upward spin tries to return to a random direction. The direction of this spin changes easily with respect to the soft material (annealed material) 1A, and the direction of this spin does not easily return to the direction of the hard material (unannealed material) 1B. This magnetization state is shown in FIG. 5 by plotting the strength X of the magnetizing magnetic field on the horizontal axis and the density Y of the magnetic field remaining in the steel plates 1A and 1B on the vertical axis. The detector 4 detects the strength of residual magnetism shown at points YA and YB in FIG. 5, respectively, for the steel plates 1A and 1B.
上記第５図に示した着磁する磁界の強さＸと残
留する磁界の密度Ｙとがなす曲線は、前記第３図
に示した曲線に係る鋼板１に比して反磁界の影響
を受けて、前記第３図に示した曲線より傾斜する
傾向にある。すなわち、この反磁界は、被検体の
大きさに関係し、特に本発明の実施に用いられる
装置においては鋼板の磁化を厚み方向に向けよう
としているために、板厚に対して反磁界の大きさ
が異なつてくる。板厚が厚くなるということは、
鋼板を磁化させるためには、強い外部磁界を必要
とする。反磁界は、磁極の強さに比例するため
に、板厚が厚くなれば、反磁界は当然大きくな
る。反磁界が大きくなれば、着磁する磁界の強さ
Ｘと残留する磁界の密度Ｙとがなす曲線の傾きは
より傾斜する。なお、第３図に示した曲線が静止
磁界（着磁器、検出器、被検体共に移動しない磁
化状態）であるのは対し、第５図に示した曲線
は、実際に本装置で測定している磁化状態（着磁
器、検出器は固定で、被検体のみが移動する。ま
たこの反対でも良い）の動磁界における、鋼板の
着磁経過を示す履歴曲線図であり、板厚は同一で
の軟質材と硬質材に対する履歴曲線（鋼板１Ａは
軟質材、１Ｂは硬質材）を示している。 The curve formed by the magnetizing magnetic field strength X and the residual magnetic field density Y shown in FIG. Therefore, the curve tends to be more sloped than the curve shown in FIG. In other words, this demagnetizing field is related to the size of the object to be examined, and in particular, since the apparatus used to implement the present invention aims to direct the magnetization of the steel plate in the thickness direction, the magnitude of the demagnetizing field is related to the thickness of the steel plate. It becomes different. The thicker the plate means,
A strong external magnetic field is required to magnetize the steel plate. Since the demagnetizing field is proportional to the strength of the magnetic pole, the thicker the plate, the larger the demagnetizing field naturally becomes. As the demagnetizing field increases, the slope of the curve formed by the strength X of the magnetizing magnetic field and the density Y of the remaining magnetic field becomes more sloped. Note that the curve shown in Figure 3 is a static magnetic field (a magnetized state in which neither the magnetizer, detector, nor object move), whereas the curve shown in Figure 5 is a static magnetic field that is actually measured with this device. This is a hysteresis curve diagram showing the course of magnetization of a steel plate in a dynamic magnetic field in a magnetization state (the magnetizer and detector are fixed and only the subject moves; the reverse is also possible), and the plate thickness is the same. The history curves for soft material and hard material (steel plate 1A is soft material, steel plate 1B is hard material) are shown.
すなわち、板厚の薄い焼鈍材１Ｃと、板厚の厚
い焼鈍材１Ｄの、着磁する磁界の強さＸと残留す
る磁界の密度Ｙとがなす曲線をそれぞれ示せば第
６図のようになり、検出器４は、鋼板１Ｃ，１Ｄ
に対し、それぞれ第６図のYC点、YD点で示す残
留磁気の強さを検出する。第６図に示すように、
板厚が厚くなると着磁する磁界の強さＸと残留す
る磁界の密度Ｙとがなす曲線の傾斜は大きくな
り、検出する残留磁気の強さは小さくなる。した
がつて、板厚が厚くなると、検出される残留磁気
は小さくなり、残留磁気は板厚に反比例すること
になる。 In other words, the curves formed by the magnetizing magnetic field strength X and the residual magnetic field density Y for the thin annealed material 1C and the thick annealed material 1D are shown in Figure 6. , the detector 4 is made of steel plates 1C, 1D
Detect the strength of residual magnetism shown at points Y C and Y D in Figure 6, respectively. As shown in Figure 6,
As the plate thickness increases, the slope of the curve formed by the strength X of the magnetizing magnetic field and the density Y of the residual magnetic field increases, and the strength of the detected residual magnetism decreases. Therefore, as the plate thickness increases, the detected residual magnetism decreases, and the residual magnetism is inversely proportional to the plate thickness.
上記検出器４は、第２図に示すように、Ｎ極お
よびＳ極感知用のセンサーを有しており、両セン
サーは通常の周囲に磁界がない場合にはバランス
しており、その出力は零となつている。鋼板１は
上記のようにＮ極に磁化されているため、この鋼
板１が上記両センサーに近づくと、Ｎ極感知用セ
ンサーのコイルが鋼板１のＮ極に励磁され、両セ
ンサーのコイル間バランスは崩れて、励磁側コイ
ルに電流が流れ、この電流値がガウスメータ４Ａ
に表示される。このようにして検出器４によつて
検出された残留磁気の強さは、変換器５で増幅さ
れ、板厚の補正を行なつて硬度換算されて、記録
計６に記録される。 As shown in FIG. 2, the detector 4 has sensors for detecting N and S poles, and both sensors are balanced when there is no magnetic field around them, and their output is It has become zero. Since the steel plate 1 is magnetized to the north pole as described above, when the steel plate 1 approaches both sensors, the coil of the sensor for detecting the north pole is excited to the north pole of the steel plate 1, and the balance between the coils of both sensors is adjusted. collapses, current flows through the excitation side coil, and this current value is measured by the Gaussmeter 4A.
will be displayed. The strength of the residual magnetism thus detected by the detector 4 is amplified by the converter 5, corrected for the plate thickness, converted into hardness, and recorded in the recorder 6.
ここで、鋼板１の上記残留磁気の強さは、以下
のように、鋼板１の硬度に相関するものであるこ
とから、上記記録計６の記録結果によつて鋼板１
の硬度を求めることが可能となる。すなわち、残
留磁気と硬度との関係は両者の間に結晶粒という
段階をおいて考えることができる。Petchは鋼の
降伏点と結晶粒の大きさとの間に次の関係がある
としている。 Here, since the strength of the residual magnetism of the steel plate 1 is correlated with the hardness of the steel plate 1 as described below, the strength of the residual magnetism of the steel plate 1 is determined by the recording result of the recorder 6.
It becomes possible to determine the hardness of That is, the relationship between residual magnetism and hardness can be considered by placing the stage of crystal grains between the two. Petch states that the following relationship exists between the yield point of steel and the grain size.
σLYP＝σ0＋KI-1/2 ……(1)
ただし、σLYPを下降伏点とし、σ0を単結晶の下
降伏点とし、Ｉを単結晶の直径とし、Ｋを定数と
する。また、凹圧硬度は塑性変形抵抗を測定する
のであるから、上記(1)式の降伏点を確度に置きか
えて考えることができる。すなわち、硬度と結晶
粒径との間に相関が認められることになる。次
に、残留磁気と結晶粒との関係を考えると結晶粒
の大きいもの程、磁化され易く、結晶粒の小さい
もの程、磁化されにくいが、結晶粒が大きいもの
は結晶粒が小さいものに比較して、単位面積当り
の結晶粒の数が少ないため、残留磁気が小さい。
反対に結晶粒が小さいものは、単位面積当りの結
晶粒の数が多いため、残留磁気は大きくなる。す
なわち、残留磁気の大きいもの程硬度は高く、残
留磁気の小さいもの程硬度は低い。このようにし
て残留磁気を測定することにより硬度が測定でき
る。 σ LYP = σ 0 +KI -1/2 (1) where σ LYP is the lower yield point, σ 0 is the lower yield point of the single crystal, I is the diameter of the single crystal, and K is a constant. Furthermore, since concave pressure hardness measures plastic deformation resistance, the yield point in equation (1) above can be replaced with accuracy. That is, a correlation is recognized between hardness and crystal grain size. Next, considering the relationship between residual magnetism and crystal grains, larger crystal grains are more easily magnetized, and smaller crystal grains are less likely to be magnetized. Since the number of crystal grains per unit area is small, residual magnetism is small.
On the other hand, when the crystal grains are small, the number of crystal grains per unit area is large, so the residual magnetism becomes large. That is, the larger the residual magnetism, the higher the hardness, and the smaller the residual magnetism, the lower the hardness. Hardness can be measured by measuring residual magnetism in this manner.
しかして、上記本発明の実施に用いられる測定
装置が鋼板に与える残留磁気の強さ、すなわち該
測定装置の未補正出力Ｖ（ｖ）が上記のように鋼
板の板厚ｔ（mm）に反比例するものであることか
ら、Ｃを定数、α＝aH＋ｂを鋼板の硬度Ｈ（HR
30T）によつて定まる定数とすれば、下記(2)式が
成立する。 Therefore, the strength of the residual magnetism imparted to the steel plate by the measuring device used to implement the present invention, that is, the uncorrected output V(v) of the measuring device, is inversely proportional to the thickness t (mm) of the steel plate as described above. Therefore, C is a constant and α=aH+b is the hardness H of the steel plate (H R
30T), the following equation (2) holds true.
Ｖ＝Ｃ／ｔ＋α＝Ｃ／ｔ＋aH＋ｂ ……(2)
上記残留磁気の強さと鋼板の板厚および硬度と
の関係を、実際の実験データを用いて、実験式を
求めたところ下記(3)式が得られた。 V = C / t + α = C / t + aH + b ... (2) The relationship between the strength of the residual magnetism and the thickness and hardness of the steel plate was determined using actual experimental data, and the following formula (3) was obtained. was gotten.
Ｖ＝0.21／ｔ＋Ｈ／30−１ ……(3)
第７図は、上記(3)式に基づく、本発明の実施に
用いられる測定装置が鋼板に与える残留磁気の強
さすなわち該測定装置の未補正出力と鋼板の板厚
との対応関係を示したものであり、例えば板厚
0.24mm、硬度計出力2.0Vの場合、両者の交点から
HR30Tのスケールを読むとその硬度は64を示す。
すなわち、鋼板の板厚と残留磁気の強さと鋼板の
硬度の三者について、一定の相関関係を得ること
が可能となる。 V=0.21/t+H/30-1...(3) Figure 7 shows the strength of the residual magnetism applied to the steel plate by the measuring device used in the implementation of the present invention, based on the above equation (3), that is, the strength of the residual magnetism of the measuring device. This shows the correspondence between the uncorrected output and the thickness of the steel plate.
In the case of 0.24mm and hardness meter output 2.0V, from the intersection of both
The hardness of H R 30T is 64 when read on the scale.
That is, it is possible to obtain a certain correlation among the thickness of the steel plate, the strength of residual magnetism, and the hardness of the steel plate.
そこで、本発明においては、前記測定装置の検
出器４によつて測定される残留磁気の強さ、すな
わち該測定装置の未補正出力Ｖを、前記相関関係
すなわち下記(4)式に基づいて、鋼板の板厚ｔに関
して補正し、より信頼度の高い硬度計出力Ｈを得
ることを可能としている。 Therefore, in the present invention, the strength of residual magnetism measured by the detector 4 of the measuring device, that is, the uncorrected output V of the measuring device, is calculated based on the correlation, that is, the following equation (4). By correcting the thickness t of the steel plate, it is possible to obtain a more reliable hardness meter output H.
Ｈ＝30（Ｖ＋1.0−１／ｔ×0.21） ……(4)
第８図は、板厚0.24mmにおける、本発明によつ
て補正された硬度計出力と、ロツクウエル硬度と
の関係を示す線図である。この第８図によれば、
硬度計出力とロツクウエル硬度との対応関係は非
常に良く、検量線に対し、ロツクウエル硬度の値
は±１の範囲に入つている。すなわち、この硬度
測定方法によれば、鋼板の硬度をオンラインでよ
り高精度に測定することが可能となり、例えば焼
鈍炉の製品に対する規格判定に用いることが可能
となる。 H=30 (V+1.0-1/t×0.21) ...(4) Figure 8 shows the relationship between the hardness meter output corrected according to the present invention and the Rockwell hardness at a plate thickness of 0.24 mm. It is a line diagram. According to this Figure 8,
The correspondence between the hardness meter output and the Rockwell hardness is very good, and the Rockwell hardness values are within the range of ±1 with respect to the calibration curve. That is, according to this hardness measuring method, it is possible to measure the hardness of a steel plate online with higher accuracy, and it can be used, for example, to determine the specifications for products of annealing furnaces.
以上のように、本発明に係る鋼板のオンライン
硬度測定方法は、鋼板と直流励磁の電磁石とを、
相対移動状態下で対向配置するとともに、電磁石
の正負両磁極を上記相対移動方向に隔置し、電磁
石の一方の磁極によつて飽和磁化された鋼板部分
を、電磁石の他方の磁極によつて逆方向に飽和磁
化し、上記飽和磁化された鋼板部分の残留磁気の
強さを測定し、予め定めた鋼板の板厚と上記残留
磁気の強さと鋼板の硬度との相関関係に基づき、
該鋼板部分の硬度を求めるようにしたものであ
る。したがつて、本発明によれば、鋼板の硬度を
オンラインでより高精度に測定することが可能と
なる。 As described above, the online hardness measurement method for a steel plate according to the present invention uses a steel plate and a DC-excited electromagnet to
The positive and negative magnetic poles of the electromagnet are arranged to face each other in a state of relative movement, and the positive and negative magnetic poles of the electromagnet are spaced apart in the relative movement direction. The strength of the residual magnetism of the saturated magnetized steel plate portion is measured, and based on the correlation between the predetermined thickness of the steel plate, the strength of the residual magnetism, and the hardness of the steel plate,
The hardness of the steel plate portion is determined. Therefore, according to the present invention, it is possible to measure the hardness of a steel plate online with higher accuracy.
第１図は本出願人が既に提案している硬度測定
方法による硬度測定結果を示す線図、第２図は本
発明の実施に用いられる測定装置を示す説明図、
第３図は第２図の測定装置による鋼板の着磁経過
を示す履歴線図、第４図は第２図の測定装置によ
る鋼板の実際の磁化状態を示す説明図、第５図は
第２図の測定装置による軟質材と硬質材に対する
着磁経過を示す履歴線図、第６図は第２図の測定
装置による厚板材と薄板材に対する着磁経過を示
す履歴線図、第７図は本発明における鋼板の板厚
および硬度と硬度計の未補正出力との関係を示す
線図、第８図は本発明による硬度計出力とロツク
ウエル硬度との関係を示す線図（板厚0.24mmの場
合）である。
１，１Ａ，１Ｂ，１Ｃ，１Ｄ…鋼板、２…電磁
石、３…磁力線、４…検出器。
FIG. 1 is a diagram showing hardness measurement results by the hardness measurement method already proposed by the applicant, FIG. 2 is an explanatory diagram showing a measuring device used in implementing the present invention,
Fig. 3 is a history diagram showing the progress of magnetization of the steel plate by the measuring device shown in Fig. 2, Fig. 4 is an explanatory diagram showing the actual magnetization state of the steel plate measured by the measuring device shown in Fig. Fig. 6 is a history line diagram showing the progress of magnetization for soft and hard materials using the measuring device shown in Fig. 2; Figure 8 is a diagram showing the relationship between the thickness and hardness of the steel plate and the uncorrected output of the hardness tester according to the present invention. case). 1, 1A, 1B, 1C, 1D... Steel plate, 2... Electromagnet, 3... Line of magnetic force, 4... Detector.
Claims (1)
下で対向配置するとともに、電磁石の正負両磁極
を上記相対移動方向に隔置し、電磁石の一方の磁
極によつて飽和磁化された鋼板部分を、電磁石の
他方の磁極によつて逆方向に飽和磁化し、上記飽
和磁化された鋼板部分の残留磁気の強さを測定
し、予め定めた鋼板の板厚と上記残留磁気の強さ
と鋼板の硬度との相関関係に基づき、該鋼板部分
の硬度を求める鋼板のオンライン硬度測定方法。1. A steel plate and a DC-excited electromagnet are arranged facing each other in a state of relative movement, and both positive and negative magnetic poles of the electromagnet are spaced apart in the direction of relative movement, and a portion of the steel plate that is saturated magnetized by one of the magnetic poles of the electromagnet is , the other magnetic pole of the electromagnet saturates in the opposite direction, measures the strength of residual magnetism in the saturated magnetized steel plate, and determines the predetermined thickness of the steel plate, the strength of the residual magnetism, and the hardness of the steel plate. An online hardness measurement method for a steel plate that determines the hardness of the steel plate portion based on the correlation with the steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2055983A JPS59147253A (en) | 1983-02-12 | 1983-02-12 | On-line hardness measurement of steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2055983A JPS59147253A (en) | 1983-02-12 | 1983-02-12 | On-line hardness measurement of steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59147253A JPS59147253A (en) | 1984-08-23 |
| JPH0141217B2 true JPH0141217B2 (en) | 1989-09-04 |
Family
ID=12030512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2055983A Granted JPS59147253A (en) | 1983-02-12 | 1983-02-12 | On-line hardness measurement of steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59147253A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0773315B2 (en) * | 1985-02-21 | 1995-08-02 | ソニー株式会社 | Telephone device |
| US11092570B2 (en) * | 2017-01-26 | 2021-08-17 | Shimadzu Corporation | Magnetic body inspection apparatus and magnetic body inspection method |
| JP6948297B2 (en) * | 2017-09-04 | 2021-10-13 | Ｊｆｅスチール株式会社 | Steel sheet manufacturing method, surface hardness measuring device for magnetic materials, and steel sheet manufacturing equipment line |
| JP7397318B2 (en) * | 2020-04-23 | 2023-12-13 | 日本製鉄株式会社 | Steel plate manufacturing method, steel pipe manufacturing method, steel plate manufacturing equipment and program |
-
1983
- 1983-02-12 JP JP2055983A patent/JPS59147253A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59147253A (en) | 1984-08-23 |
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