JPS62194410A - Measurement of thickness of steel plate - Google Patents
Measurement of thickness of steel plateInfo
- Publication number
- JPS62194410A JPS62194410A JP61036773A JP3677386A JPS62194410A JP S62194410 A JPS62194410 A JP S62194410A JP 61036773 A JP61036773 A JP 61036773A JP 3677386 A JP3677386 A JP 3677386A JP S62194410 A JPS62194410 A JP S62194410A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- radiation
- thickness
- plate
- steel
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 77
- 239000010959 steel Substances 0.000 title claims abstract description 77
- 238000005259 measurement Methods 0.000 title description 8
- 230000005855 radiation Effects 0.000 claims abstract description 40
- 238000010521 absorption reaction Methods 0.000 claims abstract description 21
- 238000004458 analytical method Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 17
- 238000004364 calculation method Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 11
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 238000012937 correction Methods 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 239000000470 constituent Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- -1 20% by weight Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 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
Landscapes
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
Description
【発明の詳細な説明】
（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。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of measuring the thickness of a rolled steel plate using radiation.
（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。(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.
但し、ρ：鋼板の密度、μｍ：鋼板の質量吸収係数、ｔ
：鋼板の板厚、Ｉｏ：板なし放射線検出量、■ｔ：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。However, ρ: density of steel plate, μm: mass absorption coefficient of steel plate, t
: thickness of steel plate, Io: detected amount of radiation without plate, t: detected amount of radiation with plate, where the density ρ and mass absorption coefficient μm of the steel plate change depending on the components of the steel plate, so To realize plate thickness measurement, it is essential to determine an appropriate density ρ and mass absorption coefficient μm.
このため、従来も前記の観点に従って、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っ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って求
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。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,
Divided into several categories according to steel type symbol classification, etc.
A method of calculating plate thickness t using density ρ and mass absorption coefficient μm determined by calculation for representative component values of each category, or density ρ and mass absorption coefficient μm determined empirically. Alternatively, a more convenient method is to focus on their product μm·ρ=μ without distinguishing between the density ρ and the mass absorption coefficient μm, and to perform a collective correction regarding this μ.
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。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.
（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、カテゴリー分は
毎の代表成分と、個々の鋼板の成分値とが、僅かづつで
はあるが異なっている為に、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。(Problem to be Solved by the Invention) However, in the method described above, the representative components for each category and the component values for each steel sheet are slightly different from each other. There was a problem in that it was impossible to perform complete plate thickness correction.
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。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.
（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。(Means for Solving the Problems) In order to solve the above 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.
The gist of this method is to measure the thickness of a steel plate using this calculation result.
（作 用）
本発明は前記のような方法によって、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。(Function) The present invention uses the method described above to determine the density and mass absorption coefficient of a steel plate based on the analysis results of the individual steel composition of the steel plate to be measured, thereby determining the density and mass absorption coefficient of the steel plate with slightly different component values. This means that the thickness of the plate can be measured accordingly. (Example) The present invention will be described below based on an example shown in the accompanying drawings.
まず第１図において、■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によって、鋼板１が
ない場合の板なし放射線検出量Ｉ０と、綱板１がある場
合の板あり放射線検出量ｒｔとを検出するようにしてい
る。First, in Fig. 1, ■ is a steel plate to be measured, and in order to detect the plate thickness t at an appropriate position during the rolling process, a radiation source 2 such as X-rays or γ-rays and this radiation source 2 are used. A radiation dose detector 4 is provided to receive radiation 3 emitted from the radiation source. The radiation dose detector 4 is configured to detect the detected amount of radiation I0 without the steel plate 1 when there is no steel plate 1 and the detected amount of radiation with the plate rt when the steel plate 1 is present.
しかして、この雨検出量■。とＩｔは、放射線厚み計５
に前述の（１）式におけるＩｏとＩｔとして入力され、
その（１）式の演算によって鋼板１の板厚ｔを出力する
ものである。However, this amount of rain detected■. and It is the radiation thickness meter 5
are input as Io and It in the above equation (1),
The plate thickness t of the steel plate 1 is output by calculating the equation (1).
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。On the other hand, before the thickness t of the steel plate 1 is calculated by the radiation thickness gauge 5, the composition of the steel components of the steel plate 1 is analyzed in advance by the steel component analysis means 6, and this analysis value is sent to a computer 7 such as a host computer. Remember it. In addition, the mass absorption coefficient μm, which changes depending on the steel composition according to the above analysis, and the means for determining the steel plate density ρ, specifically, the equations (2) and (3) described later, are calculated using the radiation thickness meter 5 ( 1) The formula is set in the correction calculation section 9 in the previous stage of the plate thickness calculation section 8 in which the formula has been set.
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、Ａ。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 A.
但し、μｍ＝測定対象鋼板の質量吸収係数μｍ逼 ：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 ９
但し、ρ：測定対象鋼板の密度
ρ１ ：純鉄の密度（＝７．８６ｇ／ｃｆｆｌ）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、＋１１式の演算に
先立って演算するようにしている。However, μm = Mass absorption coefficient μm of the steel plate to be measured 〼 : Mass absorption coefficient AI of the steel component constituent element i : Can be expressed as the composition percentage (%) of the steel component constituent element i, and the steel plate density ρ is ρ 9 However, ρ: Density of steel plate to be measured ρ1: Density of pure iron (=7.86g/cffl) ai:
It is a coefficient attached to Ai, and can be expressed as a coefficient determined theoretically or empirically. These equations (2) and (3) are set in the radiation thickness gauge 5 and are calculated prior to the calculation of equation +11.
次に、前述の綱板１の板厚ｔの測定について、第２図の
フローチャートに基づいて説明する。Next, the measurement of the thickness t of the above-mentioned steel plate 1 will be explained based on the flowchart of FIG. 2.
まず、ステップ■において鋼板の圧延が開始され、当該
鋼板の板厚ｔを測定すべくステップ■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Ｉ。と板あり放
射線検出量ｒｔとが出力される。First, rolling of a steel plate is started in step (2), and in order to measure the thickness t of the steel plate, the amount of radiation transmitted is detected in step (2), and the detected amount of radiation without the plate I. and the detected amount of radiation with plate rt are output.
一方、これに先立って、ステップ■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
テップ■において計算機に記憶される。そして、前記ス
テップ■における検出に先立ち、ステップ■において記
憶された分析値をもとに、ステップ■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）式によって演算する。そして、ステップ■において
、前記ステップ■における板なし放射線検出量■。と板
あり放射線検出量ｒｔと、ステップ■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、＋１１式によ
って演算し、当該測定鋼板の板厚ｔを測定する。On the other hand, prior to this, the steel composition of the steel plate to be measured is analyzed in step (2), and the analyzed value is stored in the computer in step (2). Prior to the detection in step (2), based on the analysis values stored in step (2), the mass absorption coefficient μm and density ρ of the steel plate to be measured are calculated using equation (2) and (2).
3) Calculate by formula. Then, in step (2), the amount of radiation detected without a plate (2) in step (2) is determined. Based on the detected radiation amount rt with the plate, the mass absorption coefficient μm and the density ρ calculated in step (2), calculation is performed according to formula +11, and the plate thickness t of the steel plate to be measured is measured.
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。Next, an example in which specific numerical values were set and measured in the embodiment described above will be described.
ここでは、対象鋼板ｌとして、鉄Ｆｅの他に、添加元素
として、炭素Ｃ： ０．８０重量２、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っ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
分は公称値による測定結果を示す。Here, as a target steel sheet l, in addition to iron Fe, additional elements include carbon C: 0.80 weight 2, silicon Si: 1.
Regarding the case where the plate thickness t of a steel plate having a steel composition including 20% by weight, manganese Mn: 0.50% by weight (all of the above are actual analysis values), using a radiation thickness meter using radiation with an energy of 100KeV ,
(a) Measurement results based on actual analytical values; (b) Categories indicate measurement results based on nominal values.
なお、鋼成分構成のカテゴリー分は公称値は、Ｃ： ０
．７０重量％、Ｓｔ ： ０．３０重量％、Ｍｎ ：
０．６０重量％であり、また放射線エネルギー１００Ｋ
ｅＶでの各元素のμｍ８値は、下記第１表のとおりであ
る。The nominal value for the category of steel composition is C: 0.
．． 70% by weight, St: 0.30% by weight, Mn:
0.60% by weight, and radiation energy 100K
The μm8 value of each element in eV is as shown in Table 1 below.
第 １ 表 各元素のμｍ８値
（単位：ｃｎ？／ｇ）
また、（３）式に示したａｌの値は下記第２表のとおり
である。Table 1 μm8 value of each element (unit: cn?/g) Also, the values of al shown in formula (3) are as shown in Table 2 below.
第 ２ 表 各元素のａｉＯ値
ここで、ａｌ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■。＝ １２４８４５９２力ウント
／秒板あり放射線検出量Ｉｔ＝２５４６４２３ Ｈ：
ｚ） ／秒であった。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．Ｓｔ：１．２０．
Ｍｎ：０．５０）〔単位：重量％〕
となる。Table 2 aiO value of each element Here, al is a value determined from physical constants such as the atomic weight of each element.Furthermore, regarding the amount of detected radiation, Detected amount of radiation without a plate■. = 12484592 force und/sec Radiation detection amount with plate It=2546423 H:
z)/second. The results of both measurements using the above numbers are:
(a) Measurement results based on actual analysis values (Fe: 97.50.C: 0.80.St: 1.20.
Mn: 0.50) [Unit: weight %]
（ｂ）カテゴリー分は公称値による測定結果（Ｆｅ：９
Ｂ、４０．Ｃ：０．７０．Ｓｉ：０．３０．Ｍｎ：０．
６０）〔単位二重量％〕
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
分は公称値による場合の板厚ｔは” ５．４９０であ
り、その板厚が０．０９ｆｌ（−９０μｍ）だけ薄く測
定されたことになる。(b) Categories are measurement results based on nominal values (Fe:9
B, 40. C: 0.70. Si:0.30. Mn: 0.
60) [Unit duplex weight %] As is clear from the results shown in (a) and (b) above, the plate thickness t is 5.58 mm based on the actual analysis value by the method of the present invention. In the conventional method category, the plate thickness t based on the nominal value is 5.490, which means that the plate thickness was measured to be 0.09 fl (-90 μm) thinner.
（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。(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
そのブロック図、第２図はフローチャートである。
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。
特許出願人 住友金属工業株式会社
第１因
第２図The drawings show an embodiment of the method of the present invention; FIG. 1 is a block diagram thereof, and FIG. 2 is a flowchart thereof. 1 is a steel plate, 3 is a radiation layer, 5 is a radiation thickness gauge, 8 is a calculation section, and 9 is a pre-stage calculation section. Patent applicant: Sumitomo Metal Industries, Ltd. Cause 1, Figure 2
Claims (1)
、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, a preset calculation formula is used to calculate the thickness of the steel plate based on the analysis results of the individual steel component composition of the steel plate to be measured. Calculate the density and mass absorption coefficient,
A method for measuring the thickness of a steel plate, characterized in that the thickness of the steel plate is measured using the calculation result.
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 true JPS62194410A (en) | 1987-08-26 |
| JPH0515206B2 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) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002350120A (en) * | 2001-05-23 | 2002-12-04 | Anritsu Corp | Method for measuring thickness by x-ray and x-ray thickness measuring apparatus |
| JP2003035530A (en) * | 2001-07-25 | 2003-02-07 | Nkk Corp | Board thickness measuring method, board thickness measuring device, and board thickness controlling method of hot-rolled steel sheet |
| KR100507571B1 (en) * | 2000-11-07 | 2005-08-17 | 주식회사 포스코 | A method for measuring thickness of steel sheet using radiation |
| JP2022059386A (en) * | 2020-10-01 | 2022-04-13 | 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 |
Cited By (5)
| 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 |
| JP2003035530A (en) * | 2001-07-25 | 2003-02-07 | Nkk Corp | Board thickness measuring method, board thickness measuring device, and board thickness controlling method of hot-rolled steel sheet |
| 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 |
| JP2022059386A (en) * | 2020-10-01 | 2022-04-13 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0515206B2 (en) | 1993-03-01 |
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