KR100213329B1 - Manufacturing method of a cold rolled steel plate - Google Patents

Manufacturing method of a cold rolled steel plate Download PDF

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Publication number
KR100213329B1
KR100213329B1 KR1019950066199A KR19950066199A KR100213329B1 KR 100213329 B1 KR100213329 B1 KR 100213329B1 KR 1019950066199 A KR1019950066199 A KR 1019950066199A KR 19950066199 A KR19950066199 A KR 19950066199A KR 100213329 B1 KR100213329 B1 KR 100213329B1
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South Korea
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roll
roughness
cold rolled
steel sheet
cold
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KR1019950066199A
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Korean (ko)
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KR970033124A (en
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노경준
김흥섭
변창세
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이구택
포항종합제철주식회사
신현준
재단법인포항산업과학연구원
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/228—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length skin pass rolling or temper rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/10—Roughness of roll surface

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

본 발명은 광택성과 도장 후 선영성이 우수한 냉연강파의 제조방법을 제공함에 그 목적이 있다.An object of the present invention is to provide a method for producing a cold rolled steel wave excellent in glossiness and linerability after painting.

본 발명은 그 롤 표면의 피치(pitch)파장의 평균값(Wca)이 Wca0.3Ra+0.085(Ra : 평균 표면거칠기)이 되도록 가공된 냉각압연덜롤(dull roll)에 의해 냉간압연하는 단계; 및 그 롤 표면의 피치의 평균산 기울기(△a)가 △a9Ra+25.9가 되도록 가공된 조질압연덜롤에 의해 조질압연하는 단계를 포함하여 구성되는 광택성 및 도장 후 선영성이 우수한 냉각압연 강판의 제조방법에 관한 것을 그 기술적 요지로 한다.The present invention comprises the steps of cold rolling by a cold roll roll processed so that the average value (Wca) of the pitch wavelength of the roll surface is Wca 0.3 Ra + 0.085 (Ra: average surface roughness); And rough rolling by a rough rolling roll processed so that the average peak slope (Δa) of the pitch of the roll surface is Δa9Ra + 25.9. The technical subject matter is a manufacturing method.

Description

광택성 및 도장후 선영성이 우수한 냉간압연강판의 제조방법Manufacturing method of cold rolled steel sheet with good gloss and good after-painting

제1도는 본 발명에 의한 냉간압연 덜롤의 조도범위를 설명하기 위한 그래프.1 is a graph for explaining the roughness range of cold rolled dulol according to the present invention.

제2도는 본 발명에 의한 조질압연 덜롤의 조도범위를 설명하기 위한 그래프.Figure 2 is a graph for explaining the roughness range of the temper rolled dulol according to the present invention.

본 발명은 자동차 또는 가전제품 등에 사용되는 냉간압연 강판(이하, 단지 '냉연강판'이라고도 함)의 제조방법에 관한 것으로서, 보다 상세하게는 광택성과 도장후 선영성이 우수한 냉연강판의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a cold rolled steel sheet (hereinafter, also referred to simply as a "cold rolled steel sheet") used in automobiles or home appliances, and more particularly, to a method for manufacturing a cold rolled steel sheet having excellent gloss and good post-paintability. will be.

냉연간판은 미려한 외관과 우수한 가공성, 양호한 강도를 나타내며, 생산과정의 연소화와 자동화에 의한 대량생산이 가능하여 비교적 값싼 가격으로 공급할 수 있다는 장점을 가지고 있어 자동차, 가전 등 내외판재로 널리 사용되고 있다. 이러한 냉연강판은 최근에 이르러서 날로 고급화되어가는 수요가의 다양한 요구 때문에 도장전의 원판인 냉연강판의 표면품질에 대한 관심이 높아져 가고 있다. 특히 고선영성, 고광택을 요구하는 수요가들의 요구에 부응하기 위하여서는 도장전의 소지금속이 되는 냉연강판의 엄격한 표면관리가 요구된다.Cold rolled sheet has a beautiful appearance, excellent processability, and good strength, and has the advantage of being able to be supplied at a relatively low price because it can be mass-produced by combustion and automation of the production process. These cold rolled steel sheet has recently been increasing interest in the surface quality of the cold rolled steel sheet, which is the original plate before painting due to the various demands of the demand that is being advanced. Particularly, in order to meet the demands of high sensibility and high gloss, strict surface management of cold rolled steel sheet that is a base metal before painting is required.

일반적으로 강판의 표면품질은 표면조도에 의해서 나타내어지며 이러한 표면조도는 조질압연 단계에서 대부분이 제어되게 된다.In general, the surface quality of the steel sheet is represented by the surface roughness, and this surface roughness is mostly controlled in the temper rolling step.

일반적으로 강판의 표면거칠기는 롤(roll)에 부여된 거칠기가 조질압연을 통하여 강판에 전사되어 얻어지며, 롤의 압하력 및 강판에 걸리는 장력, 압연유의 사용유무 등의 공정 조건에 따라 전사되는 정도가 달라지게 된다.In general, the surface roughness of the steel sheet is obtained by transferring the roughness applied to the roll to the steel sheet through temper rolling, and the degree of transfer according to the process conditions such as the rolling force of the roll, the tension applied to the steel sheet, and the use of rolling oil. Will be different.

한편, 롤에 거칠기를 부여하는 방법은 크게 덜(Dull)과 브라이트(Bright)의 두가지로 나누어지며, 각각은 다시 거칠기의 정도에 따라 세분된다. 브라이트는 지석으로 롤을 연마하여 제조되며 연마정도에 따라 거칠기 정도가 세분되고, 덜은 일차적으로 브라이트로 연마된 매끈한 롤을 다시 숏블라스트(shot blast)나 전해연마(Electro Discharge)의 방법등을 통하여 원하는 거칠기를 부여하여 얻어지게 된다.On the other hand, there are two methods for imparting roughness to rolls, which are divided into two types, namely, "Dull" and "Bright," each of which is further subdivided according to the degree of roughness. Bright is manufactured by grinding the roll with grindstone, and roughness is subdivided according to the degree of grinding, and less smoothly rolls polished first by the shot blast or electro-discharge method. It is obtained by giving a desired roughness.

브라이트로 가공된 롤은 거칠기가 매우 미세하므로 가공량이 적고, 우수한 광택이 요구되는 깡통용 소재의 제조시에만 주로 사용되며, 자동차용이나 가전용 등의 대부분의 일반 냉연강판은 프레스 성형 등의 복잡한 가공공정 및 전기도금 등의 다음 공정의 생산성을 위하여 거칠기가 다소 거친 덜로 가공된 롤이 사용된다.The rolls processed with the braid are very fine in roughness, so they are used only for the production of materials for cans that require less processing and excellent gloss.Most of the common cold rolled steels for automobiles and home appliances are used for complex machining such as press molding. Less roughened rolls are used for productivity in subsequent processes such as process and electroplating.

조질압연을 거쳐 생산되는 대부분의 냉연강판은 0.7-2.0㎛의 평균표면거칠기(Ra)를 가지게 된다. 이렇게 부여된 표면거칠기는 강판의 외관에 직접적으로 영향을 미치게 되고, 따라서 표면거칠기의 정도에 따라 광택도가 달라지게 된다.Most cold rolled steel sheets produced through temper rolling have an average surface roughness (Ra) of 0.7-2.0 µm. The surface roughness thus imparted directly affects the appearance of the steel sheet, and thus the glossiness varies according to the degree of surface roughness.

예를 들면, 일본특개소 59-34441호의 경우에는 조질압연시의 덜롤의 표면조도를 Ra(평균 표면거칠기)값과 PPI값(inch당 peak 수)을 제어함으로써 광택도 및 프레스성을 향상시킬 수 있다고 하여 PPI≥290-30Ra의 관계식으로 제한하였다. 그러나, 조질압연단계에서 대부분의 조도가 형성되기는 하나 냉간압연 단계에서의 조도 또한 최종 표면조도에 영향을 미친다는 점을 감안할 때 상기 관계식만으로 광택도를 제어한다는 것은 한계가 있으며, 특히 도장후의 선영성에 영향을 미치는 표면 프로파일(profile)중의 파장성분은 조질압연단계에서 제어되지 않는다. 또한, 같은 조도에서 산의 수가 많아지면 광의 산란정도는 증가되며 따라서 강판의 광택도는 오히려 감소하게 된다. 따라서, 광택성을 제어하기 위해서는 상기 관계식은 다른 좀더 여러부분의 제어가 필요하다.For example, in Japanese Patent Laid-Open No. 59-34441, glossiness and pressability can be improved by controlling Ra (average surface roughness) value and PPI value (number of peaks per inch) of the surface roughness of dulol during temper rolling. It was limited to the relationship of PPI≥290-30Ra. However, considering that roughness in the cold rolling stage also affects the final surface roughness in the rough rolling stage, it is limited to control the glossiness only by the above relation. The wavelength component in the affecting surface profile is not controlled in the temper rolling step. In addition, when the number of acids in the same illuminance increases, the degree of scattering of light is increased and thus the glossiness of the steel sheet is rather reduced. Therefore, in order to control the glossiness, the relational expression needs more control of other parts.

이에 본 발명자들은 강판 표면의 프로파일이 여러조로 지수들과 상관관계를 가지며 그 중에서도 Ra, PPI, △a(평균 산 기울기), Wca(파장의 평균값)들이 광택도와 높은 상관관계를 가지고 연속적으로 변화하고 있음을 연구와 실험을 통해 확인하고, 그 결과에 근거하여 본 발명을 제안하기에 이르렀다.Accordingly, the inventors have found that the profile of the steel sheet surface correlates with the indexes in several groups, among which Ra, PPI, Δa (average acid slope), and Wca (wavelength mean values) are continuously changed with high correlation with glossiness. It was confirmed through research and experiment, and came to propose the present invention based on the result.

즉, 본 발명은 냉연강판의 제조시 냉간압연단계와 조질압연 단계에서 사용되는 덜롤의 표면조도를 적절히 제어하므로서, 광택성과 도장후 선영성이 우수한 냉연강판의 제조방법을 제공하고자 하는데, 그 목적이 있다.That is, the present invention is to provide a method of manufacturing a cold rolled steel sheet excellent in glossiness and post-painting goodness by appropriately controlling the surface roughness of the dulol used in the cold rolling step and temper rolling step in the production of cold rolled steel sheet, the object is have.

이하, 본 발명을 설명한다.Hereinafter, the present invention will be described.

본 발명은 그 롤 표면의 피치(picth)파장의 평균값(Wca)이 Wca0.3Ra+0.085(Ra : 평균 표면거칠기)이 되도록 가공된 냉간압연덜롤(dull foll)에 의해 냉간압연하는 단계; 및 그 롤 표면의 피치의 평균산 기울기(△a)가 △a9Ra+25.9가 되도록 가공된 조질압연덜롤에 의해 조질압연하는 단계를 포함하여 구성되는 광택성 및 도장후 선영성이 우수한 냉간압연 강판의 제조방법에 관한 것이다.The present invention comprises the steps of cold rolling by a cold rolled roll (dull foll) processed so that the average value (Wca) of the pitch wavelength of the roll surface is Wca 0.3 Ra + 0.085 (Ra: average surface roughness); And rough rolling by a rough rolling roll processed so that the average peak slope (Δa) of the pitch of the roll surface is Δa9Ra + 25.9. It relates to a manufacturing method.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

본 발명자들은 연구결과에 의하면 강판의 표면의 프로파일은 특히 덜롤의 가공방법에 따라 차이는 있지만 Ra와 △a는 당당한 상관관계를 가지고 있으며, PPI와 Wca는 그 상관정도가 다소 적은 특징이 있다. 이 중에서 Wca 값은 조질압연단계에서 제어가 되지 않으며, 이미 조질압연전에 형성이 된다.According to the results of the present study, the surface profile of the steel sheet is different depending on the processing method of dulol, but Ra and Δa have a remarkable correlation, and PPI and Wca have a somewhat low correlation. Among these, the Wca value is not controlled in the temper rolling step, and is already formed before the temper rolling.

따라서, 본 발명은 최적의 강판 표면을 얻기 위해서는 냉간압연 단계에서 파장성분을 제어해주고, 조질압연 단계에서 미세조도성분들을 제어해 준다는 것에 특징이 있다.Therefore, the present invention is characterized by controlling the wavelength component in the cold rolling step and controlling the fine roughness component in the temper rolling step in order to obtain an optimum steel sheet surface.

구체적으로 냉간압연 덜롤은 Wca0.35Ra+0.085로서 가공을 하고, 또 조질압연 덜롤을 △a9Ra+25.9로서 가공을 제한하면 최종 강판의 광택도를 제어할 수 있으며, 이러한 강판은 소지금속의 광택도가 요구되는 도금제품 및 고광택용 강판의 제조를 가능하게 하며, 특히 광택 수준을 수요가의 요구에 부응하여 조절할 수 있다는 데에 큰 효과가 있다.Specifically, cold rolled dulols can be processed as Wca0.35Ra + 0.085, and tempered dulols can be controlled as △ a9Ra + 25.9 to control the glossiness of the final steel sheet. It is possible to manufacture the required plated products and high gloss steel sheet, and it is particularly effective to adjust the gloss level in response to the demand of the demand price.

이와 같이, 냉간압연 덜롤 조도범위 및 조질압연 덜롤의 조도범위를 나타내면, 각각 제1도와 제2도와 같이 나타낼 수 있다.Thus, when the cold rolling dulol roughness range and the rough rolling dulol range of the roughness range, it can be represented as shown in FIG.

여기서, 제1도와 같이 본 발명에서 냉간압연 덜롤의 가공범위를 제한한 이유는 도장후 선영성에 크게 영향을 미치는 Wca갑을 제어하기 위함이며, 조질압연 덜롤의 범위를 △a값으로 제한한 것은 PPI값보다 △a값이 보다 조도의 균일성을 대표할 수 있기 때문이다. 이렇게 제한된 범위로 생산된 강판은 PPI값으로 제한한 강판보다 정확한 정합성을 나타낸다.Here, the reason for limiting the processing range of the cold rolled dulol in the present invention as shown in FIG. 1 is to control the Wca pack, which significantly affects the screening properties after coating, and the limit of the range of the tempered rolled dulol to Δa is the PPI value. This is because the Δa value can more representative of the uniformity of roughness. Steel sheets produced in this limited range show more accurate than steel sheets limited by PPI values.

한편, 본 발명의 범위로 제조된 강판과 기존의 강판, 그리고 일특개 (소) 59-34441호에서 제시한 방법으로 제조된 강판의 광택도 및 Ra, △a값의 평가를 하였고, 이를 다음 [실시예]에 나타내었다.On the other hand, the gloss and Ra, Δa value of the steel sheet manufactured in the scope of the present invention and the existing steel sheet, and the steel sheet manufactured by the method described in Japanese Patent Application No. 59-34441 were evaluated, and the following [ Example].

[실시예]EXAMPLE

하기 표 1과 같은 룰 조도를 갖도록 전해 가공후 숏블라스트한 냉간압연 덜롤 및 조절압연덜롤을 이용하여 냉간압연 후 조질압연을 행하여 두께가 0.8mm인 시편을 제조하고, 제조된 각각의 시편에 대한 표면외관을 관찰하고, 그 결과를 하기 표 1에 나타내었다.After electrolytically processed to have a rule roughness as shown in Table 1 below, cold-rolled and cold-rolled using a short blasted cold rolled dilroll and a controlled rolled roll to prepare a specimen having a thickness of 0.8 mm, and the surface for each specimen prepared The appearance was observed and the results are shown in Table 1 below.

하기 표 1에서 시편 #1은 본 발명이 조건으로 제조된 강판이며, 시편 #2는 조질압연 덜롤의 조도가 제한한 범위를 벗어난 강판이며, 시편 #3은 냉간압연 덜롤의 조도가 제한범위를 벗어난 강이다. 한편 시편 #4와 시편 #5는 일본의 특허공보 (소)59-34441호에서 제시한 방법으로 제조된 강판이다. 또한, 시편#6, 시편 #7은 여러 조도범위에서 본 발명의 범위로 제조된 강판이다.In Table 1, Specimen # 1 is a steel sheet manufactured under the conditions of the present invention, Specimen # 2 is a steel sheet outside the limit of roughness rolling of the temper rolled roll, Specimen # 3 is the roughness of the cold rolled rolling roll is out of the limit It is a river. On the other hand, specimen # 4 and specimen # 5 are steel sheets manufactured by the method described in Japanese Patent Publication No. 59-34441. In addition, specimen # 6, specimen # 7 is a steel sheet manufactured in the scope of the present invention in a range of roughness.

상기 표 1에 나타낸 바와 같이, 발명강(1)(6)(7)은 여러 조도범위에서 광택도 및 도장 후 선영성이 우수한 것을 알 수 있으며, 특히 조도범위가 벗어난 비교강(2)(3)의 경우를 보면 각각 광택도 및 선영성이 좋지 않음을 알 수 있다. 또한, 일본의 특허공보 (소) 59-34441호에서 제시한 방법으로 제조된 강판인 종래강(4)(5)의 경우 냉간압연 덜롤의 조도에 따라서 원하는 표면을 얻지 못하였고, 또한 조질압연덜롤의 조다가 제한 범위에 있는 경우에도 PPI값만으로는 정합성이 떨어져서 표면외관이 좋지 않은 결과를 얻을 수 있음을 알 수 있다.As shown in Table 1, the invention steel (1) (6) (7) can be seen that the glossiness in the various roughness range and the stiffness after coating, in particular, the comparative steel (2) (3) out of the roughness range ), It can be seen that glossiness and sensibility are not good, respectively. In addition, in the case of conventional steel (4) (5), which is a steel sheet manufactured by the method disclosed in Japanese Patent Publication No. 59-34441, a desired surface was not obtained according to the roughness of the cold rolled roll roll, and also the rolled roll was rolled. Even when the roughness is within the limiting range, the PPI value alone is inferior in consistency, and thus the surface appearance may be poor.

상술한 바와 같이, 본 발명은 덜조도를 갖는 냉연강판의 제조시에 냉간압연 덜롤을 Wca0.35Ra+0.085로서 가공을 하고, 또 조질압연 덜률을 △a9Ra+25.9로서 가공을 하므로서, 광택도 및 도장 후 선영성이 우수한 냉연강판을 제조할 수 있는 효과가 있다.As described above, the present invention is processed cold rolled dulol as Wca0.35Ra + 0.085 in the production of cold rolled steel sheet having less roughness, and the rough rolling ratio as Δa9Ra + 25.9, so that gloss and coating There is an effect that can produce a cold rolled steel sheet excellent after screening properties.

Claims (1)

그 롤 표면의 피치(pitch)파장의 평균값(Wca)이 Wca0.3Ra+0.085(Ra : 평균 표면거칠기)이 되도록 가공된 냉간압연덜롤(dull roll)에 의해 냉간압연하는 단계; 및 그 롤 표면의 피치의 평균산 기울기(△a)가 △a9Ra+25.9가 되도록 가공된 조질압연덜롤에 의해 조질압연하는 단계를 포함하여 구성되는 광택성 및 도장 후 선영성이 우수한 냉간압연 강판의 제조방법.Cold rolling by a cold roll processed so that the average value Wca of the pitch wavelength of the roll surface becomes Wca 0.3 Ra + 0.085 (Ra: average surface roughness); And rough rolling by a rough rolling roll processed so that the average peak slope (Δa) of the pitch of the roll surface is Δa9Ra + 25.9. Manufacturing method.
KR1019950066199A 1995-12-29 1995-12-29 Manufacturing method of a cold rolled steel plate KR100213329B1 (en)

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