KR20030053077A - Measurement of the surface roughness of a steel palte roiied by EDT roll - Google Patents
Measurement of the surface roughness of a steel palte roiied by EDT roll Download PDFInfo
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- KR20030053077A KR20030053077A KR1020010083110A KR20010083110A KR20030053077A KR 20030053077 A KR20030053077 A KR 20030053077A KR 1020010083110 A KR1020010083110 A KR 1020010083110A KR 20010083110 A KR20010083110 A KR 20010083110A KR 20030053077 A KR20030053077 A KR 20030053077A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
- G01B11/303—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces using photoelectric detection means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
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Abstract
Description
본 발명은 EDT롤로 가공된 냉연강판의 표면조도를 실시간 측정하는 방법에 관한 것으로, 보다 상세하게는 EDT 롤로 가공된 주기적인 표면조도를 가진 강판에 적외선 레이저를 입사시켜 정반사광 및 산란광을 동시에 측정하여 냉연강판의 표면조도를 측정하는 방법에 관한 것이다.The present invention relates to a method for measuring the surface roughness of a cold rolled steel sheet processed with an EDT roll in real time. More specifically, by injecting an infrared laser into a steel sheet having periodic surface roughness processed with an EDT roll, the specular and scattered light are simultaneously measured. It relates to a method for measuring the surface roughness of cold rolled steel sheet.
표면 조도는 성형성, 도장성 및 도금밀착성 등과 같은 강판의 가공특성을 결정짓는 중요한 요소로 강판의 표면 품질향상 및 생산 제품의 품질보증을 위해 이들을 생산공정 중에 실시간으로 측정할 필요성이 점차 커지고 있다. 냉연강판에 표면조도를 부여하는 방법은 압연롤에 일정한 표면조도를 부여한 후에 냉연강판을 압연하면 강판에 표면조도가 부여된다.Surface roughness is an important factor that determines the processing characteristics of steel sheets such as formability, paintability, and plating adhesion, and the need for measuring them in real time is increasing in order to improve surface quality of steel sheets and quality assurance of manufactured products. In the method of imparting surface roughness to the cold rolled steel sheet, the surface roughness is imparted to the steel sheet when the cold rolled steel sheet is rolled after giving a constant surface roughness to the rolling roll.
압연롤에 일정한 표면조도를 부여하는 방법으로는 send blaster 방법과 EDT (electric discharge texture) 방법이 있다. Send blaster는 압연롤에 일정한 압력으로 미세한 모래를 분사시켜 압연롤의 조도를 부여하는 방법이며 EDT 방법은 압연롤에 전극을 이용하여 방전시키면서 조도를 부여하는 방법이다.As a method of imparting a constant surface roughness to the rolling rolls, there are a send blaster method and an electric discharge texture (EDT) method. Send blaster is a method of imparting the roughness of the rolling roll by spraying fine sand at a constant pressure on the rolling roll. The EDT method is a method of imparting roughness while discharging the rolling roll by using an electrode.
Send blaster 방법은 가공 및 단가가 저렴하다는 장점이 있으나 균일한 조도를 부여할 수 없으며 내연강판의 조도를 제어하기가 어려운 단점을 가지고 있어서 현재는 거의 사용이 안되고 있다. 반면에 EDT 가공은 조도를 균일하게 부여 할 수 잇는 장점을 가지고 있어서 압연롤로 주로 쓰이고 있다.Although the send blaster method has the advantage of low processing cost and low cost, it cannot be given uniform roughness and it is difficult to control the roughness of the internal steel sheet. On the other hand, EDT processing is mainly used as a rolling roll because it has the advantage of providing uniform roughness.
종래의 측정기술을 이용하여 강판의 표면 상태를 나타낼 때는 촉침을 강판 표면에 일직선으로 이동시키면서 강판 단면에 요철 상태를 그린 후 요철의 평균 높이를 측정하였다. 이러한 방법은 측정시간이 오래 걸리고 강판의 표면이 촉침에 의해 긁히므로 샘플링을 한 일부분의 시편에 대해서만 측정이 가능하고 생산 중에는 실시간 측정이나 비접촉식 측정을 할 수 없다는 제한점이 있다.When indicating the surface state of the steel sheet by using a conventional measurement technology, the average height of the unevenness was measured after drawing the uneven state on the cross section of the steel sheet while moving the stylus in a straight line on the surface of the steel sheet. This method takes a long measurement time and the surface of the steel sheet is scratched by the stylus so that only a portion of the sampled sample can be measured and there is a limitation that real-time or non-contact measurement cannot be performed during production.
또한 비접촉식 조도 측정방법으로는 적외선 레이저를 이용하여 강판에 입사시킨 후 반사되는 정반사광의 세기를 통계 처리하여 강판의 조도를 측정하는 레이저 반사광 측정방법이 있다.In addition, as a non-contact illuminance measuring method, there is a laser reflected light measuring method for measuring the illuminance of the steel sheet by statistically processing the intensity of specularly reflected light reflected after being incident on the steel sheet using an infrared laser.
그러나 이러한 방법은 send blaster로 가공된 냉연강판 측정에 이용되며 EDT 롤로 가공된 냉연강판을 측정 할 경우 주기적인 표면조도를 고려하지 않기 때문에 측정오차가 발생된다. 또한 종래기술인 출원번호 277075은 EDT 롤로 가공된However, this method is used to measure cold rolled steel sheet processed with send blaster, and measurement error occurs when measuring the cold rolled steel sheet processed with EDT roll because it does not consider periodic surface roughness. In addition, the prior art application number 277075 is processed with an EDT roll
냉연강판의 조도를 측정하기 위해서 주기적인 조도 영향이 없는 조건으로 측정하였으나 근본적으로 주기적인 효과에 의한 측정오차를 제거하지는 못하였다.In order to measure the roughness of the cold rolled steel sheet, it was measured under the condition that there is no periodic roughness effect, but it could not eliminate the measurement error due to the periodic effect.
따라서, 본 발명은 상기와 같은 제반 결점을 해소하기 위하여 창출한 것으로서, 본 발명의 목적은 적외선 레이저를 사용하여 강판에 75도로 입사시킨 후 산란되는 정반사각의 세기 와 산란각의 세기를 동시에 측정하여 정반사광과 산란광의 세기의 비를 측정하여 냉연강판의 표면조도를 측정방법을 제공하는데 있다.Therefore, the present invention was created in order to solve the above-mentioned shortcomings, and an object of the present invention is to measure the intensity of the scattered angle and the intensity of the scattered angle at the same time after incident to the steel plate by using an infrared laser at 75 degrees It is to provide a method for measuring the surface roughness of the cold rolled steel sheet by measuring the ratio of the specular and scattered light intensity.
상기의 목적을 달성하기 위하여 본 발명에 따른 방법은, EDT 롤 가공된 냉연강판의 표면조도를 실시간으로 측정하는 방법에 있어서, 반도체용 적외선 레이저를 이용하여 레이저 빔을 광파이버로 전송하며, 레이저 빔을 두 방향으로 나누어 5-15%는 광검출기로 측정하고, 95-85%는 강판에 입사시킨 후 산란되는 정반사광의 세기와 산란광의 세기를 동시에 측정하여 식을 이용하여 주기성을 가진 표면조도를 실시간으로 측정하는 것을 특징으로 하는 한다.In order to achieve the above object, the method according to the present invention, in the method for measuring the surface roughness of the EDT rolled cold-rolled steel sheet in real time, using a semiconductor infrared laser to transmit the laser beam to the optical fiber, the laser beam Divided into two directions, 5-15% is measured by the photodetector, 95-85% is measured by the intensity of the reflected light and the scattered light at the same time after entering the steel sheet It is characterized by measuring the surface roughness with periodicity in real time.
도 1 은 본 발명에 의한 냉연강판의 조도측정용 광학계 개념도.1 is a conceptual diagram of an optical system for measuring roughness of a cold rolled steel sheet according to the present invention.
도 2 는 본 발명에 따른 냉영강판의 조도 측정용 광학계의 실시예를 나타낸 도면.Figure 2 is a view showing an embodiment of an optical system for measuring the roughness of the cold-rolled steel sheet according to the present invention.
*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
10. 적외선 레이저 20, 90, 95. 광검출기10. Infrared lasers 20, 90, 95. Photodetectors
30. 광파이버 40. 파이버 마운트30. Fiber optic 40. Fiber mount
50. 시편 60. 적외선 거울50. Psalm 60. Infrared Mirror
70, 80. 적외선 투과용 렌즈70, 80. Infrared transmission lens
이하, 본 발명을 첨부된 도면을 참조하여 더욱 상세히 설명한다.Hereinafter, with reference to the accompanying drawings the present invention will be described in more detail.
도 1 은 본 발명에 의한 냉연강판의 조도측정용 광학계 개념도이고, 도 2 는 본 발명에 따른 냉영강판의 조도 측정용 광학계의 실시예를 나타낸 도면이다.1 is a conceptual diagram of an optical system for measuring the roughness of a cold rolled steel sheet according to the present invention, Figure 2 is a view showing an embodiment of the optical system for measuring the roughness of a cold-rolled steel sheet according to the present invention.
도 1에 도시된 개념도는 적외선 레이저(1)를 냉연강판(2)에 입사시키고, 산란된 레이저광은 정반사각의 광검지기(3)와 산란각의 광검지기(4)를 통하여 동시에 측정하여 주기적인 표면 조도를 측정하도록 된 것이다.In the conceptual diagram shown in FIG. 1, the infrared laser 1 is incident on the cold rolled steel sheet 2, and the scattered laser light is simultaneously measured through a photodetector 3 having a specular reflection angle and a photodetector 4 having a scattering angle. It is to measure the surface roughness.
도 2 는 EDT 롤로 가공된 냉연강판의 조도측정용 광학계를 도시한 것으로, 반도체용 적외선 레이저(10)을 광파이버를 통하여 광검출기(20)와 광파이버(40)로 전달시키도록 구성되어 있으며, 상기 광검출기(20)는 레이저빔의 출력을 모니터링하도록 되어 있다.FIG. 2 illustrates an optical system for measuring roughness of a cold rolled steel sheet processed with an EDT roll, and is configured to deliver an infrared laser 10 for a semiconductor to an optical detector 20 and an optical fiber 40 through an optical fiber. The detector 20 is adapted to monitor the output of the laser beam.
광파이버(30)는 단일모드 파이버 1 개의 입사용과 2 개의 출력용으로 나누어지고 두가닥의 출력비가 90:10으로 되어 있다. 즉 적외선 레이저에서 나온 빔은 10%은 광검출기로 전달되며 나머지 90%는 레파이버 마운트를 통하여 시편(50)에 입사되도록 되어 있으며, 시편(50)에서 산란됨 빔은 적외선 거울(60)과 렌즈(70)(80)를 통과하여 광검출기(90)(95)로 측정되게 되어 있다.The optical fiber 30 is divided into one single-mode fiber for incidence and two outputs, and the output ratio of two strands is 90:10. That is, 10% of the beam from the infrared laser is transmitted to the photodetector, and the remaining 90% is incident on the specimen 50 through the fiber mount, and the scattered beam from the specimen 50 causes the infrared mirror 60 and the lens. It passes through 70 and 80 and is measured by photodetectors 90 and 95.
적외선 거울(60)의 크기는 산란광을 포집하기 위하여 2인치 크기의 거울을 사용했으며 광검출기(10)는 산란광을 측정하기 위하여 다른 광검출기보다 신호를 50배 증폭하여 측정하도록 되어 있다.The size of the infrared mirror 60 used a 2 inch mirror to capture the scattered light and the photodetector 10 is to amplify the signal 50 times than other photodetectors to measure the scattered light.
상기와 같은 실시예를 가진 장치를 이용하여 표면 조도를 측정하는 방법을 상세히 기술하면 다음과 같다.The method of measuring the surface roughness using the apparatus having the above embodiment will be described in detail as follows.
광학적인 방법으로 표면조도를 측정하는 기본원리는 입사광선과 반사광선의세기의 비를 측정하고 이를 빛의 산란이론에 적용하여 구하는 것이다. 광학적인 방법으로 평균표면 조도를 측정하는 기본원리는 입사광선과 반사광선의 세기의 비를 측정하고 이를 빛의 산란이론에 적용하여 구하는 것이다. 그러나 마구잡이 표면조도와 주기적인 표면조도는 빛의 산란이론 모델이 상이하게 다르기 때문에 기존 광학적인 방법을 이용한 표면조도 측정장치로 주기적인 표면조도를 측정하는 것은 불가능하다. EDT 롤에 의한 주기적인 표면 조도는 마구잡이 표면조도가 주기적으로 분포되어 있어서 레이저 광을 입사한 후 정반사광의 세기와 산란광이 세기를 동시 측정하므로써 표면조도를 측정 할 수 있다.The basic principle of measuring the surface roughness by the optical method is to measure the ratio of the intensity of the incident light and the reflected light and apply it to the scattering theory of light. The basic principle of measuring the average surface roughness by the optical method is to measure the ratio of the intensity of the incident light and the reflected light and apply it to the scattering theory of light. However, since random surface roughness and periodic surface roughness are different from the light scattering theory model, it is impossible to measure periodic surface roughness by the surface roughness measuring device using the conventional optical method. The periodic surface roughness by EDT roll is distributed randomly, so the surface roughness can be measured by measuring the intensity of specularly reflected light and the intensity of scattered light after the incident laser light.
레이저 빔을 주기적인 조도 강판에 입사시켰을 때 산란각의 세기 I 는 beckman 이론에 의하여 다음과 같이 주어진다.The intensity I of scattering angle when the laser beam is incident on a periodic rough steel sheet is given by beckman's theory.
I : 주기적인 강판의 산란각의 세기I: Intensity of scattering angle of periodic steel sheet
m : 정수m: integer
F : 입사각도에 따른 일정상수F: Constant constant according to incident angle
δ : RMS 표면조도δ: RMS surface roughness
θ : 레이저 입사각θ: laser incident angle
λ : 레이저 파장λ: laser wavelength
상기 (식1)에 의해 주어지는 정반사각의 세기는 s 값에 따라 결정된다. s 값을 매우 작을 경우에는 정반사각의 세기 IR과 산란각의 세기 Is 의 비를 구하면 다음과 같이 근사될 수 있다.The intensity of the specular square given by Equation 1 is determined according to the value of s. If the value of s is very small, the ratio of the intensity I R of the specular angle and the intensity Is of the scattering angle can be approximated as follows.
따라서 표면조도 δ는Therefore, surface roughness δ is
이며 식 4와 같이 레이저 정반사각과 산란각의 비를 측정하면 EDT롤에 의한 주기적인 표면 조도를 구할 수 있게 된다.By measuring the ratio of laser specular reflection angle and scattering angle as shown in Equation 4, periodic surface roughness by EDT roll can be obtained.
상술한 본 발명에 의한 표면조도 측정방법은 EDT 롤로 가공된 내연강 판의 주기적인 표면조도를 측정하는 방법으로 강판에 적외선 레이저를 입사시켜 정반사광 및 산란광을 동시에 측정하여 주기적인 표면조도 측정식인The method of measuring surface roughness according to the present invention is a method of measuring the periodic surface roughness of an internal steel sheet processed by EDT roll and injecting an infrared laser into a steel sheet to simultaneously measure specular reflection and scattered light, thereby measuring periodic surface roughness.
에 적용하여 냉연강판의 표면조도를 정확하게 측정하는 효과가 있다. It is effective to accurately measure the surface roughness of cold rolled steel sheet.
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KR100795543B1 (en) * | 2006-03-02 | 2008-01-21 | 한국표준과학연구원 | Three demensional surface illumination measuring apparatus for Micro optical element array |
CN104315991A (en) * | 2014-10-31 | 2015-01-28 | 合肥鑫晟光电科技有限公司 | Device and method for measuring warping degree of substrate, touch screen and manufacturing method of touch screen |
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KR19980052447A (en) * | 1996-12-24 | 1998-09-25 | 김종진 | Method of measuring surface roughness of steel sheet having periodic surface roughness by electric discharge processing roll |
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2001
- 2001-12-22 KR KR1020010083110A patent/KR20030053077A/en not_active Application Discontinuation
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EP0131710A1 (en) * | 1983-05-23 | 1985-01-23 | Aluminum Company Of America | Method of determining surface roughness using a visible and infrared laser source |
US4803374A (en) * | 1985-12-05 | 1989-02-07 | Centre De Recherches Metallurgiques-Centrum Voor Research In De Metallurgie | Continuous measurement of the surface roughness of a cold-rolled product |
JPH0232207A (en) * | 1988-07-22 | 1990-02-02 | Nippon Steel Corp | Roughness measuring method for metal surface |
KR19980052447A (en) * | 1996-12-24 | 1998-09-25 | 김종진 | Method of measuring surface roughness of steel sheet having periodic surface roughness by electric discharge processing roll |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100795543B1 (en) * | 2006-03-02 | 2008-01-21 | 한국표준과학연구원 | Three demensional surface illumination measuring apparatus for Micro optical element array |
CN104315991A (en) * | 2014-10-31 | 2015-01-28 | 合肥鑫晟光电科技有限公司 | Device and method for measuring warping degree of substrate, touch screen and manufacturing method of touch screen |
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