JP7094749B2 - Inspection method of streak pattern on the surface of steel plate - Google Patents
Inspection method of streak pattern on the surface of steel plate Download PDFInfo
- Publication number
- JP7094749B2 JP7094749B2 JP2018059232A JP2018059232A JP7094749B2 JP 7094749 B2 JP7094749 B2 JP 7094749B2 JP 2018059232 A JP2018059232 A JP 2018059232A JP 2018059232 A JP2018059232 A JP 2018059232A JP 7094749 B2 JP7094749 B2 JP 7094749B2
- Authority
- JP
- Japan
- Prior art keywords
- pattern
- streak
- steel sheet
- value
- 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.)
- Active
Links
Images
Landscapes
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Description
本発明は、鋼板表面のスジ状模様の検査方法に関する。 The present invention relates to a method for inspecting a streak-like pattern on the surface of a steel sheet.
一般に、自動車用の外板パネルには、引張強度が３４０ＭＰａ以下の軟鋼板が用いられる。しかし衝突性能と軽量化との両立の観点から、サイドアウタパネルに引張強度が３４０ＭＰａを超える高張力鋼板（ハイテン、Ｈｉｇｈ Ｔｅｎｓｉｌｅ Ｓｔｒｅｎｇｔｈ Ｓｔｅｅｌ Ｓｈｅｅｔｓ）を使用する場合がある。このレベルの高張力鋼板は、鋼板（めっき）表面に、スジ状の模様が現れることがある。このスジ状模様は、塗装後の鋼板の外観品質に影響が出る場合がある。しかしこのスジ状模様が何に起因するのかが不明であり、また、定量的に検査する手法はこれまでなかった。したがって、塗装後の外観品質については、塗装してみないとわからないという状況があった。しかし、工程においては、塗装外観品質に影響しない模様のレベルで出荷、受け入れともに管理する必要がある。 Generally, a mild steel plate having a tensile strength of 340 MPa or less is used for an outer panel for an automobile. However, from the viewpoint of achieving both collision performance and weight reduction, a high-strength steel plate (High Tensile Strength Steel Sheets) having a tensile strength of more than 340 MPa may be used for the side outer panel. High-strength steel sheets of this level may have streak-like patterns on the surface of the steel sheet (plating). This streak pattern may affect the appearance quality of the steel sheet after painting. However, it is unclear what causes this streak-like pattern, and there has been no method for quantitative inspection. Therefore, there was a situation in which the appearance quality after painting could not be known until painting was performed. However, in the process, it is necessary to control both shipping and acceptance at a pattern level that does not affect the appearance quality of the paint.
従来、外板用鋼板パネルの外観品質は、検査装置を用いた管理や、限度見本を設定して目視検査にて管理がされてきた実績がある（例えば、特許文献１～３参照）。しかし、前記高張力鋼板に特有のスジ状模様という新しい現象に対する検査の信頼性は得られておらず、物理的・定量的な検査方法と管理値の設定が必要であった。 Conventionally, the appearance quality of a steel plate panel for an outer panel has been controlled by using an inspection device or by setting a limit sample and visually inspecting it (see, for example, Patent Documents 1 to 3). However, the reliability of the inspection for the new phenomenon of the streak pattern peculiar to the high-strength steel plate has not been obtained, and it is necessary to set the physical and quantitative inspection method and the control value.
検査方法と管理値決定のため、鋼板表面の模様が、表層めっきの色味に起因するのか、何らかの凹凸に起因するのかを調査したところ、めっき表面の色味は、めっきのＺｎ（亜鉛）と、下地のＦｅ（鉄）との合金化率によって決まるが、スジ状模様の周辺での合金化率の差は見られなかった。また、スジ状模様は、表面の凹凸に起因するものでもなかった。このように、スジ状の模様がなぜ見えるのかの現象の特定ができていないという状況であった。 In order to determine the inspection method and control values, we investigated whether the pattern on the surface of the steel sheet was caused by the color of the surface plating or some unevenness. Although it is determined by the alloying ratio with the underlying Fe (iron), no difference in the alloying ratio was observed around the streak-like pattern. Moreover, the streak-like pattern was not caused by the unevenness of the surface. In this way, it was not possible to identify the phenomenon of why the streak-like pattern was visible.
本発明は上記問題点を解決するものであり、塗装外観品質に影響しない外観品質を管理することのできる鋼板表面のスジ状模様の検査方法を提供することを目的とする。 The present invention solves the above-mentioned problems, and an object of the present invention is to provide a method for inspecting a streak-like pattern on a steel sheet surface, which can control the appearance quality that does not affect the coating appearance quality.
上記目的を達成するために、本発明の鋼板表面のスジ状模様の検査方法は、
塗装後の外観品質を、塗装前の鋼板表面から管理する鋼板表面のスジ状模様の検査方法であって、
スジ状模様の部分および前記スジ状模様に隣接する部分の面粗度を、スジ状模様と平行方向に測定して前記各部分のＲａ値を得て、
前記各部分のＲａ値の差分の絶対値ΔＲａを算出し、管理値とすることを特徴とする。
In order to achieve the above object, the method for inspecting the streak-like pattern on the surface of the steel sheet of the present invention is
It is a method of inspecting the streak-like pattern on the surface of a steel sheet that controls the appearance quality after painting from the surface of the steel sheet before painting.
The surface roughness of the streak-like pattern portion and the portion adjacent to the streak-like pattern was measured in the direction parallel to the streak-like pattern to obtain the Ra value of each portion.
It is characterized in that the absolute value ΔRa of the difference between the Ra values of each portion is calculated and used as a control value.
本発明によれば、塗装外観品質に影響しない外観品質を管理することのできる鋼板表面のスジ状模様の検査方法を提供することができる。本発明の検査方法では、目視検査のような見る人によって判定が変わるものではなく、客観的指標による評価が可能であるため、評価者の養成や訓練等の制度も不要となる。また、管理値が物理的な定量的指標であることから、例えば、材料メーカーと自動車メーカーとの間の受け渡し条件の合意形成もスムーズに行うことができる。 INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a method for inspecting a streak-like pattern on a steel sheet surface, which can control the appearance quality that does not affect the coating appearance quality. In the inspection method of the present invention, the judgment does not change depending on the viewer as in the case of visual inspection, and evaluation by an objective index is possible, so that a system such as training and training of evaluators is not required. Further, since the control value is a physical quantitative index, for example, consensus building of delivery conditions between a material maker and an automobile maker can be smoothly performed.
図１に、鋼板表面のＳＥＭ写真を示す。鋼板表面は、表面ＳＥＭ写真において黒色に見える黒色部と、白色に見える白色部とでスジ状模様が現れていることがわかった。図１（ａ）は黒色部を、図１（ｂ）は白色部をそれぞれ示す表面ＳＥＭ写真である。表面ＳＥＭ写真によると、めっき表面の表面性状が、黒色部と白色部とで異なることが判明した。 FIG. 1 shows an SEM photograph of the surface of the steel plate. On the surface of the steel sheet, it was found that a streak-like pattern appeared in the black part that looked black and the white part that looked white in the surface SEM photograph. FIG. 1A is a surface SEM photograph showing a black portion and FIG. 1B is a surface SEM photograph showing a white portion. According to the surface SEM photograph, it was found that the surface texture of the plated surface was different between the black part and the white part.
めっき鋼板の表面性状は、一般に、メッキ面がスキンパス圧延ロールで押しつぶされてフラット化した部分と、前記ロールに接触しなかった部分（結晶形状が残った部分）とがランダムに混在しているが、スジ状模様の見える鋼板は、白色部にフラット化した部分が集中し、黒色部はフラット化した部分が少ない、という規則性が見られた。 In general, the surface texture of a plated steel sheet is a random mixture of a portion where the plated surface is crushed by a skin pass rolling roll and flattened, and a portion where the plated surface does not come into contact with the roll (a portion where a crystal shape remains). In the steel sheet with a streak-like pattern, the flattened parts were concentrated in the white part, and the flattened parts were few in the black part.
そこで、スジ状模様の見え方が異なる４つの試料（Ｎｏ．１～４）について、黒色部と白色部の面粗度を、スジ状模様と平行方向にそれぞれ測定した。なお、Ｒａ値は、以下の方法で測定した。表面粗さ測定器（「ＳＵＲＦＣＯＭ １３０Ａ」、株式会社東京精密製）を使用して、測定長３ｍｍ、カットオフ値：０．０８ｍｍ、測定速度０．３ｍｍ／ｓの条件で、スジ状模様の部分および前記スジ状模様に隣接する部分の面粗度を、スジ状模様と平行方向に測定して、前記各部分のＲａ値を得る。その際、表面粗さ計の測定子が各部分の両方を横断しないよう留意する。 Therefore, the surface roughness of the black portion and the white portion of the four samples (Nos. 1 to 4) having different appearances of the streak pattern was measured in the direction parallel to the streak pattern. The Ra value was measured by the following method. Using a surface roughness measuring instrument ("SURFCOM 130A", manufactured by Tokyo Seimitsu Co., Ltd.), the streak-like pattern part under the conditions of measurement length 3 mm, cutoff value: 0.08 mm, and measurement speed 0.3 mm / s. And the surface roughness of the portion adjacent to the streak pattern is measured in the direction parallel to the streak pattern, and the Ra value of each portion is obtained. At that time, care should be taken not to allow the stylus of the surface roughness meter to cross both parts.
試料Ｎｏ．１～４の各部位の面粗度（Ｒａ値）の測定結果およびその差分の絶対値ΔＲａを表１に示す。ＳＥＭ観察で見られた黒色部および白色部のミクロ情報としては、黒色部のＲａ値が白色部のＲａ値よりも大きくなっており、表面粗さ計を用いて検出できることがわかった。 Sample No. Table 1 shows the measurement results of the surface roughness (Ra value) of each part of 1 to 4 and the absolute value ΔRa of the difference thereof. As for the micro information of the black part and the white part observed by SEM observation, it was found that the Ra value of the black part was larger than the Ra value of the white part and could be detected by using the surface roughness meter.
なお、各試料を目視で観察すると、Ｎｏ．１の試料は、スジ状模様が非常に濃く見えた。Ｎｏ．２およびＮｏ．３の試料は、スジ状模様が見えた。Ｎｏ．４の試料は、スジ状模様が濃く見えた。スジ状模様の見え方は、上記黒色部のＲａ値および上記白色部のＲａ値のそれぞれの絶対値ではなく、その差分の絶対値ΔＲａと相関が強いことがわかった。 When each sample was visually observed, No. In the sample of 1, the streak-like pattern looked very dark. No. 2 and No. A streak-like pattern was visible in the sample of No. 3. No. In the sample of 4, the streak-like pattern looked dark. It was found that the appearance of the streak pattern is not an absolute value of each of the Ra value of the black portion and the Ra value of the white portion, but has a strong correlation with the absolute value ΔRa of the difference.
また、ΔＲａと塗装仕上がり品質との相関があることがわかった。塗装仕上がり品質は、ΔＲａが小さいほど良好であり、本発明の鋼板表面のスジ状模様の検査方法では、例えば、管理値をΔＲａ＜０．５とすることで、塗装外観品質に影響しない外観品質を管理可能である。前記管理値は、好ましくはΔＲａ＜０．２である。 It was also found that there is a correlation between ΔRa and the paint finish quality. The smaller the ΔRa, the better the coating finish quality. In the method for inspecting the streak-like pattern on the steel sheet surface of the present invention, for example, by setting the control value to ΔRa <0.5, the appearance quality does not affect the coating appearance quality. Is manageable. The control value is preferably ΔRa <0.2.
Claims (1)
スジ状模様の部分および前記スジ状模様に隣接する部分の面粗度を、前記スジ状模様と平行方向に測定して前記各部分のＲａ値を得て、
前記各部分のＲａ値の差分の絶対値ΔＲａを算出し、管理値とすることを特徴とする鋼板表面のスジ状模様の検査方法。 It is a method of inspecting the streak-like pattern on the surface of a steel sheet that controls the appearance quality after painting from the surface of the steel sheet before painting.
The surface roughness of the streak-like pattern portion and the portion adjacent to the streak-like pattern was measured in a direction parallel to the streak-like pattern to obtain a Ra value of each portion.
A method for inspecting a streak-like pattern on a steel sheet surface, characterized in that the absolute value ΔRa of the difference between the Ra values of each portion is calculated and used as a control value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018059232A JP7094749B2 (en) | 2018-03-27 | 2018-03-27 | Inspection method of streak pattern on the surface of steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018059232A JP7094749B2 (en) | 2018-03-27 | 2018-03-27 | Inspection method of streak pattern on the surface of steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2019171389A JP2019171389A (en) | 2019-10-10 |
| JP7094749B2 true JP7094749B2 (en) | 2022-07-04 |
Family
ID=68166162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2018059232A Active JP7094749B2 (en) | 2018-03-27 | 2018-03-27 | Inspection method of streak pattern on the surface of steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP7094749B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003326301A (en) | 2002-05-10 | 2003-11-18 | Sumitomo Metal Ind Ltd | Method for manufacturing hot-rolled steel sheet |
| JP2005189113A (en) | 2003-12-25 | 2005-07-14 | Jfe Steel Kk | Surface inspecting device and surface inspection method |
| WO2008075905A1 (en) | 2006-12-20 | 2008-06-26 | Posco | Apparatus for detecting surface defect on slab |
| JP2010117279A (en) | 2008-11-13 | 2010-05-27 | Jfe Steel Corp | Method and device for detecting surface defect of slab |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59143907A (en) * | 1983-02-07 | 1984-08-17 | Sumitomo Metal Ind Ltd | Method for measuring surface roughness of steel plate |
-
2018
- 2018-03-27 JP JP2018059232A patent/JP7094749B2/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003326301A (en) | 2002-05-10 | 2003-11-18 | Sumitomo Metal Ind Ltd | Method for manufacturing hot-rolled steel sheet |
| JP2005189113A (en) | 2003-12-25 | 2005-07-14 | Jfe Steel Kk | Surface inspecting device and surface inspection method |
| WO2008075905A1 (en) | 2006-12-20 | 2008-06-26 | Posco | Apparatus for detecting surface defect on slab |
| JP2010117279A (en) | 2008-11-13 | 2010-05-27 | Jfe Steel Corp | Method and device for detecting surface defect of slab |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2019171389A (en) | 2019-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yuan et al. | Influence of specimen thickness with rectangular cross-section on the tensile properties of structural steels | |
| CN108896562B (en) | Material residual life evaluation method based on surface microscopic topography feature image analysis | |
| US20140090455A1 (en) | Ding detection system | |
| JP7363462B2 (en) | Material evaluation method | |
| JP7094749B2 (en) | Inspection method of streak pattern on the surface of steel plate | |
| CA2643770C (en) | Method and device for testing the quality of a metallic coating | |
| Nosov et al. | Nondestructive testing of the quality of blanks for the fabrication of hot-rolled strips using the acoustic-emission method | |
| JP6275248B2 (en) | Method and apparatus for determining the wear characteristics of a coated flat product | |
| Mohanty et al. | Determination of fatigue crack growth rate from experimental data: a new approach | |
| CA2739847C (en) | Method for determining shape changes of a workpiece | |
| RU2404001C2 (en) | Method and device to analyse auxiliary material layer on formed article | |
| JP6460131B2 (en) | Method for evaluating surface properties of hot dip galvanized steel sheet, apparatus for evaluating surface properties of hot dip galvanized steel sheet, and method for producing hot dip galvanized steel sheet | |
| Mucsi | Analysis of coil break defects | |
| Huang et al. | Determination of the forming limit curve using digital image correlation-comparison of different approaches to pinpoint the onset of localized necking | |
| Shetulov et al. | Fatigue-induced damage of high-strength steels | |
| JP7366807B2 (en) | Evaluation method of shrinkage pattern of painted steel plate | |
| Li et al. | Effect of pre-strain on edge cracking limit for advanced high-strength steel using digital image correlation | |
| Duchac et al. | Optimization of Raster Point Deposition Methodology for Deformation Analyses | |
| Ichinose et al. | Detection of the failure zone caused by cyclic loading | |
| Štamborská et al. | Stress-strain analysis of plane specimens made from R7T steel | |
| Trzepieciński et al. | Experimental evaluation of value of friction coefficient in the drawbead region | |
| JP2020027049A (en) | Method for quantitatively evaluating quality of machined surface | |
| CN113466230A (en) | Quantitative measurement method for pearlite and sorbite content of high-carbon steel wire | |
| US20180304433A1 (en) | Stainless steel pipe with excellent corrosion resistance and manufacturing method thereof | |
| Milesi et al. | Whitening Limit Diagram of the zinc sheet phosphate coating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| RD03 | Notification of appointment of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7423 Effective date: 20180509 |
|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20210203 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20211207 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20211214 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20220204 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20220621 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20220622 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 7094749 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |