JPH0515206B2 - - Google Patents
Info
- Publication number
- JPH0515206B2 JPH0515206B2 JP61036773A JP3677386A JPH0515206B2 JP H0515206 B2 JPH0515206 B2 JP H0515206B2 JP 61036773 A JP61036773 A JP 61036773A JP 3677386 A JP3677386 A JP 3677386A JP H0515206 B2 JPH0515206 B2 JP H0515206B2
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- thickness
- radiation
- steel
- plate
- 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 - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 65
- 239000010959 steel Substances 0.000 claims description 65
- 230000005855 radiation Effects 0.000 claims description 32
- 238000010521 absorption reaction Methods 0.000 claims description 18
- 238000004364 calculation method Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 11
- 238000004458 analytical method Methods 0.000 claims description 9
- 238000000691 measurement method Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 239000011572 manganese Substances 0.000 description 6
- 238000012937 correction Methods 0.000 description 5
- 239000000470 constituent Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Description
（産業上の利用分野）
本発明は、圧延鋼板の板厚を放射線を用いて測
定する方法に関するものである。
（従来の技術）
この種測定方法における放射線透過方式の鋼板
の板厚測定の基本式は、次の式で表すことができ
る。
ｔ＝１／μm・ρ・lnI0／It …(1)
但し、ρ：鋼板の密度、μm：鋼板の質量吸収
係数、ｔ：鋼板の板厚、I0：板なし放射線検出
量、It：板あり放射線検出量
ここで、鋼板の密度ρ及び質量吸収係数μmは、
鋼板の成分に依存して変化する為、高精度の板厚
測定を実現するには、適切な密度ρと質量吸収係
数μmを決定することが不可欠である。
このため、従来も前記の観点に従つて、できる
だけ適切な密度ρと質量吸収係数μmを決定する
べき手段が取られていた。例えば、種々多岐にわ
たる鋼成分の構成を、鋼種記号区分等によつてい
くつかのカテゴリーに分け、各々のカテゴリーの
代表成分値に関して計算によつて求めた密度ρ及
び質量吸収係数μm、或いは経験的に決定した密
度ρ及び質量吸収係数μmの値を用いて板厚ｔを
計算する方法。或いは、更に簡便には、密度ρと
質量吸収係数μmを区別せず、それらの積μm・ρ
＝μに注目して、このμに関してひとまとめの補
正を行なう方法。またその他には、放射線によら
ない機械的な方法と比較して補正し、板厚を測定
する方法等も提案されている。
（発明が解決しようとする問題点）
しかしながら前記したような方法では、カテゴ
リー分け毎の代表成分と、個々の鋼板の成分値と
が、僅かづつではあるが異なつている為に、全て
の鋼板に対して完全な板厚補正を行うことは不可
能であるという問題を有していた。
本発明は、前記問題点に鑑みて成されたもので
あり、全ての鋼板について完全な補正を可能とす
ることができる鋼板の板厚測定方法を提供せんと
するものである。
（問題点を解決するための手段）
前記問題点を解決するために本発明の鋼板の板
厚測定方法は、放射線により鋼板の板厚を測定す
る方法において、鋼板の板厚を演算により算出す
るに際し、測定対象鋼板の個々の鋼成分構成の分
析結果に基づいて、予め設定した演算式により鋼
板の密度と質量吸収係数を演算し、この演算結果
を用いて鋼板の板厚を測定することを要旨とする
ものである。
（作 用）
本発明は前記のような方法によつて、測定対象
鋼板の個々の鋼成分構成の分析結果に基づいて、
鋼板の密度と質量吸収係数を決定することによ
り、成分値が僅かに異なる鋼板に対応してその板
厚の測定を行うことができることとなる。
（実施例）
以下本発明を添付図面に示す一実施例に基づい
て説明する。
まず第１図において、１は被測定用の鋼板であ
り、圧延工程中の適当な位置において、その板厚
ｔを検出すべく、Ｘ線やγ線等の放射線源２と、
この放射線源２から放射される放射線３を受ける
放射線量検出器４を設けている。そして、前記放
射線量検出器４によつて、鋼板１がない場合の板
なし放射線検出量I0と、鋼板１がある場合の板あ
り放射線検出量Itとを検出するようにしている。
しかして、この両検出量I0とItは、放射線厚み計
５に前述の(1)式におけるI0とItとして入力され、
その(1)式の演算によつて鋼板１の板厚ｔを出力す
るものである。
一方、前記鋼板１の板厚ｔの、放射線厚み計５
による演算に先立ち、予め鋼板１の鋼成分の構成
の分析を鋼成分分析手段６で行ない、この分析値
を上位計算機等の計算機７に記憶しておく。ま
た、前記分析による鋼成分構成に依存して変化す
る質量吸収係数μmと、鋼板密度ρの決定手段、
具体的には後述する(2)式及び(3)式を、放射線厚み
計５において(1)式が設定された板厚演算部８の前
段の補正演算部９に設定する。
ここで、質量吸収係数μmと鋼板密度ρを鋼板
１の前述の分析値より決定する(2)式と(3)式につい
て説明する。まず、質量吸収係数μmは、
μm＝i〓μmiAi／100 …(2)
但し、μm：測定対象鋼板の質量吸収係数
μmi：鋼成分構成元素ｉの質量吸収係数
Ai：鋼成分構成元素ｉの構成百分率（％）
で表わすことができ、また、鋼板密度ρは、
ρ＝ρs／１＋i〓ai・Ai …(3)
但し、ρ：測定対象鋼板の密度
ρs：純鉄の密度（≒7.86ｇ／cm3）
ai：Aiにつく係数で、理論的、或いは経験的に
決定される。
で表わすことができる。このような(2)式と(3)式
を、放射線厚み計５に設定しておき、(1)式の演算
に先立つて演算するようにしている。
次に、前述の鋼板１の板厚ｔの測定について、
第２図のフローチヤートに基づいて説明する。
まず、ステツプにおいて鋼板の圧延が開始さ
れ、当該鋼板の板厚ｔを測定すべくステツプに
おいて放射線の透過量が検出され、板なし放射線
検出量I0と板あり放射線検出量Itとが出力され
る。一方、これに先立つて、ステツプにおいて
当該測定対象鋼板の鋼成分構成の分析が行なわ
れ、その分析値がステツプにおいて計算機に記
憶される。そして、前記ステツプにおける検出
に先立ち、ステツプにおいて記憶された分析値
をもとに、ステツプにおいて当該測定対象鋼板
の質量吸収係数μmと密度ρを(2)式及び(3)式によ
つて演算する。そして、ステツプにおいて、前
記ステツプにおける板なし放射線検出量I0と板
あり放射線検出量Itと、ステツプにおける演算
結果の質量吸収係数μmと密度ρとに基づき、(1)
式によつて演算し、当該測定鋼板の板厚ｔを測定
する。次に、以上説明した実施例において、具体
的な数値を設定して測定した例について説明す
る。
ここでは、対象鋼板１として、鉄Feの他に、
添加元素として炭素Ｃ：0.80重量％、けい素Si：
1.20重量％、マンガンMn：0.50重量％（以上い
ずれも実際分析値）を含む鋼成分構成を有する鋼
板について、その板厚ｔを、エネルギー100KeV
の放射線を用いる放射線厚み計によつて測定する
場合について、(a)実際分析値による測定結果と、
(b)カテゴリー分け公称値による測定結果を示す。
なお、鋼成分構成のカテゴリー分け公称値は、
Ｃ：0.70重量％、Si：0.30重量％、Mn：0.60重量
％であり、また放射線エネルギー100KeVでの各
元素のμmi値は、下記第１表のとおりである。
(Industrial Application Field) The present invention relates to a method of measuring the thickness of a rolled steel plate using radiation. (Prior Art) The basic formula for measuring the thickness of a steel plate using the radiation transmission method in this type of measuring method can be expressed by the following formula. t=1/μm・ρ・lnI 0 /It…(1) However, ρ: Density of steel plate, μm: Mass absorption coefficient of steel plate, t: Thickness of steel plate, I 0 : Detected amount of radiation without plate, It: Radiation detection amount with plate Here, the density ρ and mass absorption coefficient μm of the steel plate are:
Since they vary depending on the composition of the steel plate, it is essential to determine an appropriate density ρ and mass absorption coefficient μm in order to achieve highly accurate plate thickness measurement. For this reason, conventional methods have been taken to determine the density ρ and mass absorption coefficient μm as appropriate as possible in accordance with the above-mentioned viewpoint. For example, the composition of a wide variety of steel components may be divided into several categories based on the steel type code classification, etc., and the density ρ and mass absorption coefficient μm determined by calculation for the representative component values of each category, or the empirical A method of calculating plate thickness t using the values of density ρ and mass absorption coefficient μm determined in . Or, more simply, without distinguishing between density ρ and mass absorption coefficient μm, their product μm・ρ
= A method of focusing on μ and making corrections for this μ all at once. Other methods have also been proposed, such as a method that measures plate thickness by making corrections compared to mechanical methods that do not rely on radiation. (Problem to be solved by the invention) However, in the method described above, since the representative components for each category and the component values of individual steel sheets differ slightly, The problem was that it was impossible to perform accurate plate thickness correction. The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method for measuring the thickness of a steel plate that allows complete correction for all steel plates. (Means for Solving the Problems) In order to solve the above-mentioned problems, the method for measuring the thickness of a steel plate of the present invention includes calculating the thickness of a steel plate by calculation in a method of measuring the thickness of a steel plate using radiation. At this time, the density and mass absorption coefficient of the steel plate are calculated using a preset calculation formula based on the analysis results of the individual steel component composition of the steel plate to be measured, and the thickness of the steel plate is measured using the calculation results. This is a summary. (Function) The present invention uses the method described above, based on the analysis results of the individual steel composition of the steel plate to be measured, to
By determining the density and mass absorption coefficient of a steel plate, it is possible to measure the thickness of steel plates with slightly different component values. (Example) The present invention will be described below based on an example shown in the accompanying drawings. First, in FIG. 1, 1 is a steel plate to be measured, and a radiation source 2 such as X-rays or γ-rays is used at an appropriate position during the rolling process to detect the plate thickness t.
A radiation dose detector 4 that receives radiation 3 emitted from this radiation source 2 is provided. The radiation dose detector 4 is configured to detect the detected radiation amount I 0 without the plate when the steel plate 1 is not present, and the detected radiation amount It with the plate when the steel plate 1 is present.
Therefore, both of these detected amounts I 0 and It are inputted to the radiation thickness meter 5 as I 0 and It in the above-mentioned equation (1),
The thickness t of the steel plate 1 is output by calculating the equation (1). On the other hand, the radiation thickness gauge 5 of the plate thickness t of the steel plate 1
Prior to the calculation, the composition of the steel components of the steel plate 1 is analyzed in advance by the steel component analysis means 6, and this analyzed value is stored in a computer 7 such as a host computer. Further, a means for determining the mass absorption coefficient μm that changes depending on the steel composition according to the analysis and the steel plate density ρ,
Specifically, equations (2) and (3), which will be described later, are set in the correction calculation section 9 of the radiation thickness meter 5, which is located upstream of the plate thickness calculation section 8 in which the equation (1) is set. Here, equations (2) and (3) for determining the mass absorption coefficient μm and the steel plate density ρ from the above-mentioned analytical values of the steel plate 1 will be explained. First, the mass absorption coefficient μm is: μm= i 〓μm i A i /100 …(2) where μm: Mass absorption coefficient of the steel plate to be measured μm i : Mass absorption coefficient of steel component constituent element i A i : Steel component It can be expressed as the constituent percentage (%) of the constituent element i, and the steel plate density ρ is ρ=ρ s /1+ i 〓a i・A i …(3) where ρ is the density of the steel plate to be measured ρ s : Density of pure iron (≒7.86g/cm 3 ) a i : Coefficient attached to A i , determined theoretically or empirically. It can be expressed as These equations (2) and (3) are set in the radiation thickness gauge 5 and are calculated prior to the calculation of equation (1). Next, regarding the measurement of the plate thickness t of the steel plate 1 mentioned above,
This will be explained based on the flowchart shown in FIG. First, rolling of the steel plate is started in a step, and the amount of radiation transmitted is detected in the step to measure the thickness t of the steel plate, and the detected amount of radiation without the plate I 0 and the detected amount of radiation with the plate It are output. . On the other hand, prior to this, the steel composition of the steel sheet to be measured is analyzed in a step, and the analyzed values are stored in a computer in a step. Then, prior to the detection in the step, the mass absorption coefficient μm and density ρ of the steel plate to be measured are calculated in accordance with equations (2) and (3) based on the analysis values stored in the step. . Then, in the step, based on the detected amount of radiation without the plate I 0 and the detected amount of radiation with the plate It in the step, and the mass absorption coefficient μm and density ρ of the calculation results in the step, (1)
The thickness t of the steel plate to be measured is measured using the formula. Next, an example in which specific numerical values were set and measured in the embodiment described above will be described. Here, as the target steel plate 1, in addition to iron Fe,
Additional elements include carbon C: 0.80% by weight, silicon Si:
For a steel plate having a steel composition including 1.20% by weight of manganese and 0.50% by weight of manganese and Mn (all of the above are actual analysis values), the plate thickness t is determined by an energy of 100KeV.
When measuring with a radiation thickness meter using radiation, (a) measurement results based on actual analytical values;
(b) Shows measurement results based on categorization nominal values. The nominal values for the categorization of steel composition are as follows:
C: 0.70% by weight, Si: 0.30% by weight, Mn: 0.60% by weight, and the μm i values of each element at radiation energy of 100 KeV are as shown in Table 1 below.
【表】
また、(3)式に示したaiの値は下記第２表のとお
りである。[Table] Furthermore, the values of a i shown in equation (3) are as shown in Table 2 below.
【表】
ここで、aiは各元素の原子量等の物理定数から
決定した値
更に、放射線検出量については、
板なし放射線検出量I0＝12484592カウント／秒
板あり放射線検出量It＝2546423カウント／秒
であつた。以上の数値による両測定結果は、
(a) 実際分析値による測定結果
（Fe：97.50、Ｃ：0.80、Si：1.20、Mn：0.50）
〔単位：重量％〕
μm＝0.372×97.50／100＋0.151×0.80／100＋0.182×1
.20／100＋0.350×0.50／100≒0.368
ρ＝ρs（＝7.86）／（１＋3.674×0.80＋9.885×1.20
＋1.655×10-1×0.50）10-3≒7.74
ｔ＝１／0.368×7.74ln12484592／2546423≒0.558cm≒5
.58mm
となる。
(b) カテゴリー分け公称値による測定結果
（Fe：98.40、Ｃ：0.70、Si：0.30、Mn：0.60）
〔単位：重量％〕
μm＝0.372×98.40／100＋0.151×0.70／100＋0.182×0
.30／100＋0.350×0.60／100≒0.370
ρ＝ρs（＝7.86）／（１＋3.674×0.70＋9.885×0.30
＋1.655×10-1×0.60）10-3≒7.82
ｔ＝１／0.370×7.82ln12484592／2546423≒0.549≒5.4
9mm
以上、(a)及び(b)に示した結果から明らかなよう
に、本発明方法による実際分析値による場合の板
厚ｔが5.58mmであるのに対して、従来方法のカテ
ゴリー分け公称値による場合の板厚ｔは5.49mmで
あり、その板厚が0.09mm（＝90μm）だけ薄く測
定されたことになる。
（発明の効果）
以上説明したように本発明は、放射線により鋼
板の板厚を演算するに際し、測定対象鋼板の個々
の鋼成分構成の分析結果に基づいて、予め設定し
た演算式により鋼板の密度と質量吸収係数を演算
し、その演算結果を用いて鋼板の板厚を測定する
ようにしたので、成分値が僅かに異なる個々の鋼
板に対応して、高精度の正確な板厚を測定するこ
とができ、鋼板の品質向上に寄与することができ
る極めて有益な発明である。[Table] Here, a i is a value determined from physical constants such as the atomic weight of each element. Furthermore, regarding the amount of detected radiation, the amount of detected radiation without a plate I 0 = 12484592 counts/sec The amount of detected radiation with a plate It = 2546423 counts / seconds. Both measurement results based on the above numerical values are: (a) Measurement results based on actual analytical values (Fe: 97.50, C: 0.80, Si: 1.20, Mn: 0.50) [Unit: weight%] μm = 0.372 × 97.50 / 100 + 0.151 ×0.80／100＋0.182×1
.20/100+0.350×0.50/100≒0.368 ρ=ρ s (=7.86)/(1+3.674×0.80+9.885×1.20
+1.655×10 -1 ×0.50) 10 -3 ≒7.74 t=1/0.368×7.74ln12484592/2546423≒0.558cm≒5
It becomes .58mm. (b) Measurement results based on categorization nominal values (Fe: 98.40, C: 0.70, Si: 0.30, Mn: 0.60) [Unit: Weight%] μm=0.372×98.40/100+0.151×0.70/100+0.182×0
.30/100+0.350×0.60/100≒0.370 ρ=ρ s (=7.86)/(1+3.674×0.70+9.885×0.30
+1.655×10 -1 ×0.60) 10 -3 ≒7.82 t=1/0.370×7.82ln12484592/2546423≒0.549≒5.4
9 mm or more, as is clear from the results shown in (a) and (b), the plate thickness t according to the actual analysis value using the method of the present invention is 5.58 mm, whereas the nominal value for categorization using the conventional method The plate thickness t in this case is 5.49 mm, which means that the plate thickness was measured to be 0.09 mm (=90 μm) thinner. (Effects of the Invention) As explained above, when calculating the thickness of a steel plate using radiation, the present invention calculates the density of the steel plate using a preset calculation formula based on the analysis results of the individual steel component composition of the steel plate to be measured. The mass absorption coefficient is calculated and the calculation result is used to measure the thickness of the steel plate, so it is possible to accurately measure the thickness of each steel plate with slightly different component values. This is an extremely useful invention that can contribute to improving the quality of steel sheets.
図面は本発明の方法の一実施例を示すもので、
第１図はそのブロツク図、第２図はフローチヤー
トである。
１は鋼板、３は放射線、５は放射線厚み計、８
は演算部、９は前段演算部。
The drawing shows an embodiment of the method of the invention,
FIG. 1 is a block diagram thereof, and FIG. 2 is a flowchart. 1 is a steel plate, 3 is a radiation gauge, 5 is a radiation thickness gauge, 8
9 is a calculation section, and 9 is a pre-processing section.
Claims (1)
いて、鋼板の板厚を演算により算出するに際し、
測定対象鋼板毎に鋼成分構成を分析してこの分析
結果に基づいて予め設定した演算式により鋼板の
密度と質量吸収係数を演算し、この演算結果を用
いて鋼板の板厚を測定することを特徴とする鋼板
の板厚測定方法。1. In the method of measuring the thickness of a steel plate using radiation, when calculating the thickness of the steel plate by calculation,
The steel component composition is analyzed for each steel plate to be measured, the density and mass absorption coefficient of the steel plate are calculated using a preset calculation formula based on the analysis results, and the thickness of the steel plate is measured using the calculation results. Characteristic steel plate thickness measurement method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61036773A JPS62194410A (en) | 1986-02-21 | 1986-02-21 | Measurement of thickness of steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61036773A JPS62194410A (en) | 1986-02-21 | 1986-02-21 | Measurement of thickness of steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62194410A JPS62194410A (en) | 1987-08-26 |
| JPH0515206B2 true JPH0515206B2 (en) | 1993-03-01 |
Family
ID=12479084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61036773A Granted JPS62194410A (en) | 1986-02-21 | 1986-02-21 | Measurement of thickness of steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62194410A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100507571B1 (en) * | 2000-11-07 | 2005-08-17 | 주식회사 포스코 | A method for measuring thickness of steel sheet using radiation |
| JP2002350120A (en) * | 2001-05-23 | 2002-12-04 | Anritsu Corp | Method for measuring thickness by x-ray and x-ray thickness measuring apparatus |
| JP4686924B2 (en) * | 2001-07-25 | 2011-05-25 | Ｊｆｅスチール株式会社 | Thickness measuring method, thickness measuring device and thickness control method for hot rolled steel sheet |
| JP7298577B2 (en) * | 2020-10-01 | 2023-06-27 | Ｊｆｅスチール株式会社 | Plate thickness calculation method, plate thickness control method, plate material manufacturing method, plate thickness calculation device, and plate thickness control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55114903A (en) * | 1979-02-27 | 1980-09-04 | Sumitomo Metal Ind Ltd | Radiation thickness gauge |
| JPS57197408A (en) * | 1981-05-29 | 1982-12-03 | Toshiba Corp | Measuring method of plate thickness |
-
1986
- 1986-02-21 JP JP61036773A patent/JPS62194410A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55114903A (en) * | 1979-02-27 | 1980-09-04 | Sumitomo Metal Ind Ltd | Radiation thickness gauge |
| JPS57197408A (en) * | 1981-05-29 | 1982-12-03 | Toshiba Corp | Measuring method of plate thickness |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62194410A (en) | 1987-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |