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KR20180117665A - Cold rolling equipment of metal strip and cold rolling method - Google Patents

Cold rolling equipment of metal strip and cold rolling method Download PDF

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KR20180117665A
KR20180117665A KR1020187027896A KR20187027896A KR20180117665A KR 20180117665 A KR20180117665 A KR 20180117665A KR 1020187027896 A KR1020187027896 A KR 1020187027896A KR 20187027896 A KR20187027896 A KR 20187027896A KR 20180117665 A KR20180117665 A KR 20180117665A
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coolant
concentration
rolling
low
work roll
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KR102110068B1 (en
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마사키 히라이
이치로 다노쿠치
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제이에프이 스틸 가부시키가이샤
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203Cooling
    • B21B45/0209Cooling devices, e.g. using gaseous coolants
    • B21B45/0215Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B27/00Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06Lubricating, cooling or heating rolls
    • B21B27/10Lubricating, cooling or heating rolls externally
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203Cooling
    • B21B45/0209Cooling devices, e.g. using gaseous coolants
    • B21B45/0215Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233Spray nozzles, Nozzle headers; Spray systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-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
    • B21B1/22Metal-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
    • B21B1/24Metal-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 in a continuous or semi-continuous process
    • B21B1/28Metal-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 in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-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
    • B21B1/22Metal-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
    • B21B2001/221Metal-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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B27/00Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06Lubricating, cooling or heating rolls
    • B21B27/10Lubricating, cooling or heating rolls externally
    • B21B2027/103Lubricating, cooling or heating rolls externally cooling externally
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2275/00Mill drive parameters
    • B21B2275/02Speed
    • B21B2275/04Roll speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74Temperature control, e.g. by cooling or heating the rolls or the product
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239Lubricating
    • B21B45/0245Lubricating devices
    • B21B45/0248Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates

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

Abstract

저농도의 쿨런트를 워크 롤 입측 근방에서 분사하고, 고농도의 쿨런트를 상기 저농도의 쿨런트의 분사 위치보다 상류측에서 분사하여 압연을 실시하는 순환 급유 방식의 금속띠의 냉간 압연 설비에 있어서, 상기 워크 롤 입측의 판면 상에 형성되는 저농도의 쿨런트의 액 고임부 선단이 고농도의 쿨런트의 분사 위치에 도달하지 않도록, 상기 저농도의 쿨런트의 분사량을 압연 속도에 따라 변화시키는 제어 설비를 갖는 금속띠의 냉간 압연 설비를 사용하여 금속띠를 냉간 압연함으로써, 압연 속도가 저하되었을 때여도 플레이트 아웃성을 저해하지 않고 압연하는 것을 가능하게 한다.There is provided a cold rolling system for a metal band in a circulating lubrication system in which a coolant of a low concentration is injected in the vicinity of a work roll entrance and a coolant of a high concentration is injected at an upstream side of a coolant injection position of the low concentration for rolling, A control station for controlling the injection amount of the low-concentration coolant in accordance with the rolling speed so that the tip end of the low-concentration coolant liquid formed on the plate surface of the work roll does not reach the high-concentration coolant injection position, By cold-rolling the metal strip using the band cold rolling facility, rolling can be performed without hindering the plate-out property when the rolling speed is lowered.

Description

금속띠의 냉간 압연 설비 및 냉간 압연 방법Cold rolling equipment of metal strip and cold rolling method

본 발명은, 금속띠의 냉간 압연 설비 및 냉간 압연 방법에 관한 것으로, 구체적으로는, 윤활유의 공급을 순환 방식으로 실시하는 금속띠의 냉간 압연 설비와, 그 냉간 압연 설비를 사용한 냉간 압연 방법에 관한 것이다. 또한, 본 발명에서는, 상기 금속띠로서「강판」을 예로 들어 설명한다.More particularly, the present invention relates to a cold rolling equipment of a metal strip for supplying lubricating oil in a circulating manner and a cold rolling method using the cold rolling equipment will be. In the present invention, the "steel plate" is described as an example of the metal strip.

금속띠의 냉간 압연 설비는, 윤활유 (압연유) 의 공급 방식에 따라, 압연유를 강판 표면에 직접 분사하여 공급함과 동시에, 롤 표면에 냉각수를 분사하여 냉각시키는 직접 급유 방식과, 에멀션화된 압연유를 함유하는 냉각수 (쿨런트) 를 강판이나 워크 롤의 표면에 공급하고, 윤활과 워크 롤의 냉각을 동시에 실시하는 순환 급유 방식의 2 종류로 분류된다. 후자의 순환 급유 방식은, 압연유를 순환하여 사용할 수 있기 때문에, 1 회에 한해서만 사용하는 직접 급유 방식과 비교하여 압연유의 비용이 낮은 반면, 압연유의 농도가 낮기 때문에, 압연성이 떨어지는 경향이 있다.The cold rolling equipment for metal strips is characterized in that a direct lubrication system in which rolling oil is sprayed directly onto the surface of a steel plate and supplied with cooling water on the surface of the roll to cool the system according to the supply method of the lubricating oil (rolling oil) And a circulating lubrication system in which cooling water (coolant) is supplied to the surface of a steel plate or a work roll, and lubrication and cooling of the work roll are carried out at the same time. The latter circulation lubrication system can use the rolling oil in circulation, so that the rolling oil is lower in cost than the direct lubrication system which is used only once, while the rolling performance is lowered because the concentration of the rolling oil is low.

상기 순환 급유 방식의 문제점을 해소하려면, 쿨런트 중의 압연유의 농도를 높이는 것이 유효하다. 그러나, 압연유의 농도를 높이면, 금속띠와 워크 롤 간의 윤활성은 향상되지만, 냉각능이 저하된다. 그 때문에, 쿨런트 중에 함유되는 압연유의 농도는, 일반적으로 2 ∼ 4 mass% 정도로 조정되고 있다.In order to solve the problem of the circulation lubrication system, it is effective to increase the concentration of the rolling oil in the coolant. However, if the concentration of the rolling oil is increased, the lubricity between the metal strip and the work roll is improved, but the cooling ability is lowered. Therefore, the concentration of the rolling oil contained in the coolant is generally adjusted to about 2 to 4 mass%.

그런데, 순환 급유 방식의 냉간 압연 설비에 있어서도, 변형 저항이 큰 강종을 양호한 생산성으로 압연하는 것이 필요한 경우가 있고, 이러한 요구에 부응하는 기술로서, 특허문헌 1 의「하이브리드 압연」이 개시되어 있다. 이 하이브리드 압연 기술은, 상기의 압연유 농도가 2 ∼ 4 mass% 정도인 쿨런트 (이후,「저농도 쿨런트」라고도 칭한다) 를 워크 롤의 입측에서 분사하는 것에 더하여, 상기 저농도 쿨런트의 분사 위치보다 상류측에 있어서 압연유 농도가 10 ∼ 15 mass% 정도인 고농도 쿨런트 (이후,「고농도 쿨런트」라고도 칭한다) 를 분사하는 것이다. 이 기술을 채용하면, 고농도 쿨런트의 공급에 의해, 많은 유분을 판면에 부착시킬 (이하,「플레이트 아웃」이라고 부른다) 수 있기 때문에, 강대 (鋼帶) 와 워크 롤 간의 윤활성을 높여 압연 하중을 저감시킬 수 있다. 여기서, 유분이 판면에 부착되려면, 어느 정도 이상의 시간이 필요한 점에서, 플레이트 아웃성을 높이기 위해서는, 고농도 쿨런트의 분사는, 워크 롤로부터 상류측으로 어느 정도 떨어진 위치에서 실시하는 것이 바람직하다.However, in cold rolling equipment of the circulation lubrication system, it is sometimes necessary to roll a steel product having a high deformation resistance to a good productivity. As a technique meeting this demand, "Hybrid rolling" of Patent Document 1 is disclosed. In this hybrid rolling technique, in addition to spraying a coolant (hereinafter also referred to as " low concentration coolant ") having a rolling oil concentration of about 2 to 4 mass% at the inlet of the work roll, Concentration coolant (hereinafter also referred to as " high-concentration coolant ") having a rolling oil concentration of about 10 to 15 mass% on the upstream side. When this technology is employed, a large amount of oil can be adhered to the surface of the plate (hereinafter referred to as "plate-out") by the supply of high concentration coolant. Therefore, lubricity between the steel strip and the work roll is increased, Can be reduced. Here, in order to increase the plate-out property, it is preferable to spray the high-concentration coolant at a position somewhat distant from the work roll to the upstream side, in order to allow the oil to adhere to the surface of the plate.

일본 공개특허공보 2007-144514호 (일본 특허공보 제4905056호)Japanese Patent Application Laid-Open No. 2007-144514 (Japanese Patent Publication No. 4905056)

그런데, 실제의 하이브리드 압연에 있어서는, 압연 소재 (모판) 에 존재하는 결함 등에 의해, 압연 속도를 낮춰야 하는 경우가 있다. 그러나, 저농도 쿨런트의 공급량을 압연 속도에 상관없이 일정하게 하고 있던 경우에는, 압연 속도가 저하되면, 워크 롤 입측의 강판의 판면 상에 형성되는 저농도 쿨런트의 액 고임부가 상류측으로 확장되어, 액 고임부의 길이가 길어지고, 그 상류측의 선단부가, 고농도 쿨런트의 분사 위치에까지 도달하는 경우가 있다. 그러한 상태에서는, 판면 상에 고인 저농도 쿨런트를 향하여 고농도 쿨런트를 분사하게 되기 때문에, 고농도 쿨런트는 저농도 쿨런트와 혼합하여 희석되고, 고농도 쿨런트에 함유되는 유분이 판면에 닿지 않게 되어, 하이브리드 압연의 효과가 얻어지지 않게 된다.However, in actual hybrid rolling, the rolling speed may need to be lowered due to defects existing in the rolled material (base plate). However, in the case where the supply amount of the low-concentration coolant is made constant regardless of the rolling speed, when the rolling speed is lowered, the liquid-solidification portion of the low-concentration coolant formed on the plate surface of the steel sheet on the work- The length of the liquid suspension portion becomes long and the tip portion on the upstream side thereof may reach the injection position of the high concentration coolant. In such a state, since the high-concentration coolant is injected toward the low-concentration coolant on the plate surface, the high-concentration coolant is diluted by mixing with the low-concentration coolant, the oil contained in the high-concentration coolant does not contact the plate surface, It is impossible to obtain the effect of

또한, 상기의 문제에 대해서는, 고농도 쿨런트의 압연유 농도를 더욱 높이는 것을 생각할 수 있지만, 압연유의 사용량이 증가하고, 원단위를 악화시킨다는 문제가 있다.With respect to the above problem, it is conceivable to further increase the concentration of the high-concentration coolant in the rolling oil, but there is a problem that the amount of the rolling oil used increases and the unit load deteriorates.

또, 고농도 쿨런트의 분사 위치를, 저농도 쿨런트의 액 고임부가 형성되는 범위보다 더욱 상류측으로 이행시키는 것도 고려되지만, 탠덤식과 같은 냉간 압연 설비에서는, 스탠드 간의 거리에 제약이 있기 때문에 사실상 어렵다.It is also considered that the injecting position of the high concentration coolant is shifted further upstream than the range in which the liquid concentrate of the low concentration coolant is formed. However, in the cold rolling equipment such as the tandem type, there is a limit to the distance between the stands.

본 발명은, 종래 기술이 안는 상기 문제점을 감안하여 이루어진 것으로, 그 목적은, 순환 방식으로 하이브리드 압연을 실시하는 냉간 압연 설비에 있어서, 압연 속도가 저하되었을 때여도 플레이트 아웃성을 저해하지 않고 압연할 수 있는 금속띠의 냉간 압연 설비를 제공함과 함께, 그 냉간 압연 설비를 사용한 금속띠의 냉간 압연 방법을 제안하는 것에 있다.DISCLOSURE OF THE INVENTION The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide a cold rolling facility which performs hybrid rolling in a circulating manner, And to provide a cold rolling method of a metal strip using the cold rolling facility.

발명자들은, 상기 과제의 해결을 위하여 예의 검토를 거듭하였다. 그 결과, 상기 문제점을 해결하려면, 냉간 압연 설비에, 압연 속도에 따라 저농도의 쿨런트의 분사량을 변화시키는 기능을 갖게 하고, 워크 롤 입측의 판면 상에 형성되는 저농도의 쿨런트의 액 고임부 선단이 고농도의 쿨런트의 분사 위치에 도달하지 않도록, 저농도의 쿨런트의 분사량을 제어하면서 압연하는 것이 유효한 것을 알아내어, 본 발명을 완성시켰다.SUMMARY OF THE INVENTION The inventors of the present invention have conducted intensive studies for solving the above problems. As a result, in order to solve the above problems, it is necessary to provide a cold rolling facility with a function of changing the injection amount of coolant at a low concentration according to the rolling speed, and to provide a coolant- It is effective to control the injection amount of the coolant at a low concentration so as not to reach the injection position of the coolant at the high concentration, thereby completing the present invention.

즉, 본 발명은, 저농도의 쿨런트를 워크 롤 입측 근방에서 분사하고, 고농도의 쿨런트를 상기 저농도의 쿨런트의 분사 위치보다 상류측에서 분사하여 압연을 실시하는 순환 급유 방식의 금속띠의 냉간 압연 설비에 있어서, 상기 워크 롤 입측의 판면 상에 형성되는 저농도의 쿨런트의 액 고임부 선단이 고농도의 쿨런트의 분사 위치에 도달하지 않도록, 상기 저농도의 쿨런트의 분사량을 압연 속도에 따라 변화시키는 제어 설비를 갖는 것을 특징으로 하는 금속띠의 냉간 압연 설비이다.That is, the present invention relates to a method for cooling a metal band of a circulating lubrication system in which a coolant of a low concentration is injected in the vicinity of a work roll entrance, and a high-concentration coolant is injected on the upstream side of the coolant injection position of the low- In the rolling facility, the injection amount of the coolant of the low concentration is changed in accordance with the rolling speed so that the tip of the coolant liquid impregnated portion of the low concentration formed on the plate surface of the work roll entrance side does not reach the injection position of the high concentration coolant The cold rolling equipment of the metal strip.

본 발명의 상기 금속띠의 냉간 압연 설비는, 상기 고농도의 쿨런트의 분사량을, 압연 속도에 따라 변화시키는 제어 설비를 갖는 것을 특징으로 한다.The cold rolling equipment of the metal strip of the present invention is characterized by having a control facility for changing the injected amount of coolant at the high concentration in accordance with the rolling speed.

또, 본 발명의 상기 금속띠의 냉간 압연 설비에 있어서의 상기 저농도 쿨런트는, 압연유의 농도가 2 ∼ 4 mass%, 상기 고농도 쿨런트는, 압연유의 농도가 10 ∼ 15 mass% 인 것을 특징으로 한다.The low concentration coolant in the cold rolling equipment of the metal strip according to the present invention is characterized in that the concentration of the rolling oil is 2 to 4 mass% and the concentration of the rolling oil is 10 to 15 mass% in the high concentration coolant.

또, 본 발명은, 순환 급유 방식의 냉간 압연 설비로, 저농도의 쿨런트를 워크 롤 입측 근방에서 분사하고, 고농도의 쿨런트를 상기 저농도의 쿨런트의 분사 위치보다 상류측에서 분사하여 압연을 실시하는 금속띠의 냉간 압연 방법에 있어서, 상기 저농도의 쿨런트의 분사량을 압연 속도에 따라 변화시킴으로써, 상기 워크 롤 입측의 판면 상에 형성되는 저농도의 쿨런트의 액 고임부 선단이 고농도의 쿨런트의 분사 위치에 도달하지 않도록 제어하는 것을 특징으로 하는 금속띠의 냉간 압연 방법을 제안한다.Further, according to the present invention, a coolant of a low concentration is injected in the vicinity of the work roll in a circulating lubrication type cold rolling facility, and a coolant of a high concentration is injected from the upstream side of the coolant injection position of the low concentration to perform rolling Wherein the low concentration coolant ejection amount is changed in accordance with the rolling speed so that the tip of the coolant liquid impregnated portion formed on the plate surface on the side of the work roll is cooled at a high coolant temperature So as not to reach the ejection position of the metal strip.

본 발명의 상기 금속띠의 냉간 압연 방법은, 상기 고농도의 쿨런트의 분사량을, 압연 속도에 따라 변화시키는 것을 특징으로 한다.The cold rolling method of the metal strip according to the present invention is characterized in that the injection amount of the coolant at the high concentration is changed according to the rolling speed.

또, 본 발명의 상기 금속띠의 냉간 압연 방법에 사용하는 상기 저농도 쿨런트는, 압연유의 농도가 2 ∼ 4 mass%, 상기 고농도 쿨런트는, 압연유의 농도가 10 ∼ 15 mass% 인 것을 특징으로 한다.The low concentration coolant used in the cold rolling method of the metal strip of the present invention is characterized in that the concentration of the rolling oil is 2 to 4 mass% and the concentration of the rolling oil is 10 to 15 mass% in the high concentration coolant.

본 발명에 의하면, 워크 롤 입측의 판면 상에 형성되는 저농도의 쿨런트의 액 고임부 선단이 고농도의 쿨런트의 분사 위치에 도달하지 않도록 제어하므로, 하이브리드 압연의 효과를 충분히 향수하는 것이 가능해진다.According to the present invention, it is possible to fully enjoy the effect of the hybrid rolling because the low concentration coolant tip end formed on the plate surface of the work roll is prevented from reaching the high-concentration coolant injection position.

도 1 은 종래의 하이브리드 압연에 있어서의 압연유의 공급 계통을 설명하는 도면이다.
도 2 는 압연 속도 (V) 와 액 고임부 길이 (X) 의 관계를 나타내는 모식도이다.
도 3 은 압연 속도가 낮을 때에, 액 고임부의 선단이 고농도 쿨런트의 분사 위치까지 도달한 상태를 설명하는 도면이다.
도 4 는 저농도 쿨런트의 분사량 (Q) 과 액 고임부 길이 (X) 의 관계를 나타내는 모식도이다.
도 5 는 압연 속도에 따라 저농도 쿨런트의 분사량을 제어하는 본 발명의 냉간 압연 설비에 있어서의 압연유의 공급 계통의 일례를 설명하는 도면이다.
도 6 은 본 발명의 냉간 압연 방법에 있어서의 저농도 쿨런트의 분사량의 제어 방법을 설명하는 도면이다.
1 is a view for explaining a supply system of rolling oil in a conventional hybrid rolling.
Fig. 2 is a schematic diagram showing the relationship between the rolling speed V and the liquid gauge length X. Fig.
3 is a view for explaining a state in which the leading end of the liquid suspension reaches the injection position of the high concentration coolant when the rolling speed is low.
Fig. 4 is a schematic diagram showing the relationship between the injection amount Q of the low-concentration coolant and the liquid gauge length X. Fig.
5 is a view for explaining an example of a supply system of rolling oil in the cold rolling facility of the present invention for controlling the injection amount of low concentration coolant in accordance with the rolling speed.
6 is a view for explaining a method of controlling the injection amount of the low-concentration coolant in the cold rolling method of the present invention.

도 1 은, 종래의 순환 방식의 냉간 압연 설비에서 하이브리드 압연 기술을 채용했을 때의 쿨런트의 공급 계통을 설명하는 도면이다. 강판 (1) 은, 워크 롤 (2) 로 소정의 판두께로 압연된다. 이 때, 저농도 쿨런트는, 스프레이 펌프 (8) 에 의해, 스프레이 헤더 (3) 로부터 강판 표면에 분사되고, 강판 (1) 과 워크 롤 (2) 간의 윤활성을 높임과 동시에, 워크 롤 (2) 의 냉각을 실시하고 있다. 강판 표면에 분사되어 사용된 저농도 쿨런트는, 그 후, 오일 팬 (11) 으로부터 오일 셀러에 설치한 리턴 탱크 (4) 에 회수되고, 리턴 펌프 (5) 로 지상에 있는 필터 (6) 를 통하여 클린 탱크 (7) 에 되돌려져, 순환 사용된다. 이 때, 스프레이 헤더 (3) 로부터 강판 표면에 분사된 저농도 쿨런트는, 판 상면에 상류측을 향하여 길이 (X) 의 액 고임부 (10) 를 형성한다.BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view for explaining a coolant supply system when a hybrid rolling technique is employed in a conventional circulation type cold rolling facility. FIG. The steel sheet (1) is rolled to a predetermined thickness by the work roll (2). At this time, the low-concentration coolant is sprayed from the spray head 3 onto the surface of the steel sheet by the spray pump 8 to increase the lubricity between the steel strip 1 and the work roll 2, Cooling is performed. The low concentration coolant sprayed on the surface of the steel plate is then recovered from the oil pan 11 to the return tank 4 provided in the oil cellar and is returned to the clean tank 5 via the filter 6 on the ground by the return pump 5, Returned to the tank 7, and circulated. At this time, the low concentration coolant jetted from the spray header 3 onto the surface of the steel sheet forms the liquid impregnated portion 10 having the length X toward the upstream side on the upper surface of the plate.

한편, 고농도 쿨런트는, 고농도 쿨런트 탱크 (12) 에서 조합 (調合) 되고, 스프레이 펌프 (13) 에 의해 스프레이 헤더 (9) 로부터 강판 표면에 분사된다. 분사되어, 사용된 고농도 쿨런트는, 상기 서술한 오일 팬 (11) 에 의해 회수되고, 저농도 쿨런트와 혼합되어, 저농도 쿨런트로서 순환 사용된다. 또한, 고농도 쿨런트의 스프레이 헤더 (9) 는, 유분이 판면에 부착되는 시간을 충분히 확보하여 플레이트 아웃성을 높이기 위하여, 저농도 쿨런트의 분사 위치보다 상류측이며, 또한 워크 롤로부터 상류측에 거리 (L) 떨어진 위치에 설치되어 있다. 여기서, 도면 중의 14 는, 전 (前) 스탠드의 압연으로 강판 표면에 부착된 쿨런트를 제거하는 기능을 갖는 탈수 롤이다.On the other hand, the high-concentration coolant is combined in the high-concentration coolant tank 12, and is sprayed from the spray header 9 onto the surface of the steel sheet by the spray pump 13. The high-concentration coolant which is injected and used is recovered by the above-described oil pan 11, mixed with the low-concentration coolant, and circulated as a low-concentration coolant. The high-concentration coolant spray header 9 is provided upstream of the low-concentration coolant injection position and further upstream from the work roll in order to sufficiently secure the time for oil to adhere to the plate surface, (L). Here, reference numeral 14 in the drawing is a dehydrated roll having a function of removing coolant attached to the surface of the steel sheet by rolling the front stand.

도 2 는, 압연 속도 (V) 와 워크 롤 입측의 판면 상에 형성되는 저농도 쿨런트의 액 고임부의 길이 (X) 의 관계를 모식적으로 나타낸 것이다. 롤 바이트에 끌여들여지는 압연유의 양은 압연 속도 (V) 에 따라 변화하기 때문에, 액 고임부의 길이 (X) 는, 압연 속도가 낮으면 길고, 높으면 짧아진다.Fig. 2 schematically shows the relationship between the rolling speed (V) and the length (X) of the liquid impregnated portion of the low concentration coolant formed on the plate surface on the work roll entrance side. Since the amount of the rolling oil drawn into the roll bytes varies depending on the rolling speed V, the length X of the liquid impregnated portion is long when the rolling speed is low, and becomes short when the rolling speed is low.

또, 도 3 은, 압연 속도 (V) 가 저하되었을 때에 있어서의, 저농도 쿨런트의 액 고임부 길이 (X) 와, 워크 롤로부터 상류측에 거리 (L) 떨어져 설치된 고농도 쿨런트의 스프레이 헤더 설치 위치의 관계를 모식적으로 나타낸 것으로, 압연 속도 (V) 가 낮을 때에는, 저농도 쿨런트의 액 고임부 길이 (X) 는, 워크 롤 (2) 과 고농도 쿨런트의 스프레이 헤더 (9) 의 설치 위치 간의 거리 (L) 보다 길어져, 탈수 롤 (14) 의 위치까지 도달하는 경우도 있다.3 is a graph showing the relationship between the liquid impregnated length X of the low concentration coolant and the distance L to the upstream side from the work roll when the rolling speed V is lowered, The liquid impregnated length X of the low concentration coolant is set to be smaller than the set position of the work roll 2 and the spray head 9 of the high concentration coolant when the rolling speed V is low, And reaches the position of the dewatering roll 14 in some cases.

또, 도 4 는, 저농도 쿨런트의 분사량 (Q) 과 저농도 쿨런트의 액 고임부 길이 (X) 의 관계를 모식적으로 나타낸 것이다. 액 고임부의 길이 (X) 는, 저농도 쿨런트의 분사량 (Q) 에 따라 변화하고, 분사량 (Q) 이 작아지면 액 고임부의 길이 (X) 는 짧고, 분사량 (Q) 이 커지면 액 고임부의 길이 (X) 는 길어진다.4 schematically shows the relationship between the injection amount Q of the low concentration coolant and the liquid impregnated length X of the low concentration coolant. The length X of the liquid suspension changes in accordance with the injection amount Q of the low concentration coolant and the length X of the liquid suspension increases as the injection amount Q becomes small. When the injection amount Q becomes large, The length X of the guide member becomes longer.

그래서, 본 발명은, 압연 속도 (V) 가 저하되었을 때에는, 저농도 쿨런트의 분사량 (Q) 을 적게 하여, 저농도 쿨런트의 액 고임부 길이 (X) 를, 워크 롤 (2) 과 고농도 쿨런트의 스프레이 헤더 (9) 의 설치 위치 간의 거리 (L) 보다 짧게 함으로써, 즉 액 고임부의 상류측 선단이 고농도 쿨런트의 스프레이 헤더의 설치 위치에 도달하지 않도록 함으로써, 고농도 쿨런트를, 항상 강판 표면에 직접 분사할 수 있도록 하였다. 즉, 본 발명은, 압연 속도 (V) 에 따라, 저농도 쿨런트의 분사량 (Q) 을 조정함으로써, 플레이트 아웃성이 우수한 냉간 압연을 실현하는 것에 특징이 있다.Therefore, in the present invention, when the rolling speed V is lowered, the injection quantity Q of the low concentration coolant is decreased and the liquid impregnated length X of the low concentration coolant is set to the work roll 2 and the high concentration coolant By setting the distance L between the mounting positions of the spray headers 9 of the high concentration coolant so that the upstream end of the liquid impregnate does not reach the installation position of the high density coolant spray header, In the same manner as in the first embodiment. That is, the present invention is characterized by realizing cold rolling with excellent plate-out property by adjusting the injection amount Q of the low-concentration coolant in accordance with the rolling speed (V).

도 5 는, 압연 속도에 따라 저농도 쿨런트 분사량을 조정하는 본 발명의 냉간 압연 설비의 쿨런트 공급 계통도의 일례를 나타낸 것이다. 저농도 쿨런트의 공급 계통에, 유량 조절 밸브 (17) 를 형성하고, 워크 롤의 구동 모터 (16) 로부터의 압연 속도 지령에 기초하여 저농도 쿨런트의 액 고임부 길이 (X) 가, 고농도 쿨런트의 분사 위치까지의 거리 (L) 보다 짧아지는 저농도 쿨런트의 분사량 (Q) 을 분산 제어 시스템 DCS (Distributed Control System) (15) 로 계산하고, 이 결과를 저농도 쿨런트 공급 계통에 형성한 유량 조절 밸브 (17) 에 개도 지령을 부여하도록 하고 있다.5 shows an example of a coolant supply system of the cold rolling facility of the present invention for adjusting the low-concentration coolant injection quantity in accordance with the rolling speed. The flow rate control valve 17 is formed in the supply system of the low concentration coolant and the liquid impregnated length X of the low concentration coolant is set to be the high concentration coolant X on the basis of the rolling speed command from the drive motor 16 of the work roll, Concentration coolant injection quantity Q that is shorter than the distance L to the injection position of the low-concentration coolant supply system is calculated by the dispersion control system DCS (Distributed Control System) 15, And an opening command is given to the valve 17.

그런데, 고농도 쿨런트를, 압연 속도가 저하되었을 때에도, 압연 속도가 높을 때와 동일한 양으로 분사하면, 강판 표면에 분사되는 압연유가 많아지기 때문에 윤활성이 향상된다. 그러나, 윤활성이 지나치게 높아지면, 슬립이나 채터링 등의 압연 이상을 일으키는 원인이 된다. 그래서, 고농도 쿨런트의 분사량도, 압연 속도에 따라 조정하면, 냉간 압연에 필요한 최적의 유분을 공급할 수 있기 때문에, 안정적으로 냉간 압연을 실시하는 것이 가능해진다.However, when the high-concentration coolant is sprayed at the same amount as when the rolling speed is high even when the rolling speed is lowered, the lubricant is improved because the amount of rolling oil injected onto the surface of the steel is increased. However, if the lubricity is excessively high, it causes rolling abnormality such as slip or chattering. Therefore, when the injection amount of the high-concentration coolant is adjusted in accordance with the rolling speed, it is possible to supply the optimum oil necessary for cold rolling, and hence it is possible to stably perform cold rolling.

고농도 쿨런트의 분사량을 압연 속도에 따라 조정하려면, 저농도 쿨런트의 경우와 마찬가지로, 고농도 쿨런트의 공급 계통에 유량 조절 밸브를 형성하고, 압연 속도 지령에 기초하여 고농도 쿨런트의 분사량을 적정 범위로 제어하도록 하면 된다.In order to adjust the injection amount of the high concentration coolant to the rolling speed, a flow control valve is formed in the high concentration coolant supply system as in the case of the low concentration coolant, and the injection amount of the high concentration coolant is adjusted to an appropriate range .

일반적으로, 압연 속도가 높아지면, 압연 부하가 높아지기 때문에, 공급하는 압연유의 분사량을 증대해 줄 필요가 있지만, 상기와 같이 고농도 쿨런트의 분사량을 압연 속도에 따라 조정하는 경우에는, 압연 속도에 따라 최적의 압연 유량을 분사하는 것이 가능해진다.Generally, the higher the rolling speed, the higher the rolling load, so it is necessary to increase the injection amount of the rolling oil to be supplied. However, when the injection amount of the high concentration coolant is adjusted in accordance with the rolling speed as described above, It becomes possible to spray an optimum rolling flow rate.

실시예Example

도 6 은, 실기 압연기에 있어서, 압연 속도를 200 m/min, 400 m/min 및 1000 m/min 의 3 단계로 변화시켰을 때의, 저농도 쿨런트의 분사량 (Q) 과 판면 상에 형성된 저농도 쿨런트의 액 고임부의 길이 (X) 의 관계를 나타낸 것이다.6 is a graph showing the relationship between the injection amount Q of the low-concentration coolant and the low-concentration coolness Q formed on the printing plate when the rolling speed is changed in three steps of 200 m / min, 400 m / min and 1000 m / And the length (X) of the liquid suspension of the runt.

여기서, 도면 중의 A 점은, 압연 속도 (V) = 1000 mpm, 저농도 쿨런트의 분사량을 최대의 Qmax 로서 압연하고 있을 때의 액 고임부 길이 (X) 를 나타내고 있다. 이 A 점에서는, 압연 속도가 높고, 단위 시간당의 가공 발열량이 많기 때문에, 저농도 쿨런트의 분사 유량을 최대의 Qmax 로 분사하여 워크 롤을 냉각시키고 있지만, 롤 바이트 사이에 끌여들여지는 저농도 쿨런트의 양도 많기 때문에, 액 고임부의 길이 (X) 는, 워크 롤과 고농도 쿨런트 스프레이 헤더 설치 위치간의 거리 (L) 보다 짧다.Here, the point A in the drawing represents the liquid repellent length X when the rolling speed (V) = 1000 mpm and the injection amount of low concentration coolant is rolled at the maximum Q max . In this point A, since the rolling speed is high and the amount of machining heat per unit time is large, the work roll is cooled by injecting the injection flow rate of the low-concentration coolant at the maximum Q max . However, in the low-concentration coolant The length X of the liquid holding portion is shorter than the distance L between the work roll and the high concentration coolant spray header mounting position.

여기서, 압연 소재에 결함이 있는 등의 어떠한 원인으로 압연 속도가 감속된 경우에는, 도 2 에 나타낸 바와 같이 액 고임부의 길이가 길어진다. 예를 들어, 압연 속도 (V) 를 1000 mpm 에서 400 mpm 까지 감속하면, 액 고임부의 길이 (X) 는, A 점에서 B 점으로 이동하고, 액 고임부 길이가 워크 롤과 고농도 쿨런트 스프레이 헤더 설치 위치간의 거리 (L) 보다 길어진다.Here, when the rolling speed is reduced for some reason such as a defect in the rolled material, the length of the liquid impregnated portion becomes long as shown in Fig. For example, when the rolling speed (V) is reduced from 1000 mpm to 400 mpm, the length (X) of the liquid suspension moves from point A to point B and the liquid suspension length is increased by the work roll and high- (L) between the header mounting positions.

그래서, 저농도 쿨런트의 분사량을 Qmax 에서 Q1 까지 내리면, 액 고임부 길이 (X) 는 C 점으로 이동하고, 액 고임부 길이 (X) 는, 워크 롤과 고농도 쿨런트 스프레이 헤더 설치 위치간의 거리 (L) 보다 짧아진다. 이 때, 저농도 쿨런트의 분사량의 저하에 의해, 롤 냉각능도 저하되지만, 압연 속도의 저하에 의해 단위 시간당의 가공 발열량도 작아지므로 문제는 발생하지 않는다.Thus, when the injection amount of the low-concentration coolant is lowered from Q max to Q 1 , the liquid retainer length X moves to point C, and the liquid retainer length X is set between the work roll and the high concentration coolant spray header installation position Becomes shorter than the distance (L). At this time, although the cooling capacity of the roll is lowered due to the decrease of the injection amount of the low-concentration coolant, there is no problem because the amount of heat to be machined per unit time decreases due to the reduction of the rolling speed.

또, 출측 코일 분할 등을 위하여, 추가로 압연 속도 (V) 를 400 mpm 에서 200 mpm 까지 감속한 경우여도, 저농도 쿨런트 분사의 유량을 Q2 까지 좁히면, 액 고임부의 길이 (X) 는 C 점에서 D 점으로 이행하므로, 액 고임부의 길이 (X) 는, 워크 롤과 고농도 쿨런트 스프레이 헤더 설치 위치간의 거리 (L) 보다 짧아진다.If the flow rate of the low-concentration coolant injection is narrowed to Q 2 even when the rolling speed (V) is further reduced from 400 mpm to 200 mpm for the output coil division or the like, the length X The distance X from the point C to the point D becomes shorter than the distance L between the work roll and the high concentration coolant spray header mounting position.

1 : 금속띠 (강판)
2 : 워크 롤
3 : 저농도 쿨런트 스프레이 헤더
4 : 리턴 탱크
5 : 리턴 펌프
6 : 필터
7 : 클린 탱크
8 : 스프레이 펌프
9 : 고농도 쿨런트 스프레이 헤더
10 : 저농도 쿨런트의 액 고임부
11 : 오일 팬
12 : 고농도 쿨런트 탱크
13 : 고농도 쿨런트 스프레이 펌프
14 : 탈수 롤
15 : 분산 제어 시스템
16 : 워크 롤의 구동 모터
17 : 저농도 쿨런트의 유량 조절 밸브
1: metal strip (steel plate)
2: Work roll
3: Low concentration coolant spray header
4: return tank
5: Return pump
6: Filter
7: Clean tank
8: Spray pump
9: High density coolant spray header
10: Low concentration coolant fluid
11: Oil pan
12: High concentration coolant tank
13: High concentration coolant spray pump
14: Dehydrated roll
15: Distributed control system
16: Driving motor of work roll
17: Low concentration coolant flow control valve

Claims (6)

저농도의 쿨런트를 워크 롤 입측 근방에서 분사하고, 고농도의 쿨런트를 상기 저농도의 쿨런트의 분사 위치보다 상류측에서 분사하여 압연을 실시하는 순환 급유 방식의 금속띠의 냉간 압연 설비에 있어서,
상기 워크 롤 입측의 판면 상에 형성되는 저농도의 쿨런트의 액 고임부 선단이 고농도의 쿨런트의 분사 위치에 도달하지 않도록, 상기 저농도의 쿨런트의 분사량을 압연 속도에 따라 변화시키는 제어 설비를 갖는 것을 특징으로 하는 금속띠의 냉간 압연 설비.
There is provided a cold rolling system for a metal band in a circulation lubrication system in which a coolant of a low concentration is injected in the vicinity of a work roll entrance and the coolant of a high concentration is injected on the upstream side of the injection position of the coolant of the low concentration for rolling,
And control means for varying the injection amount of the coolant at a low concentration in accordance with the rolling speed so that the tip of the coolant liquid impregnated portion formed on the plate surface of the work roll on the side of the work roll does not reach the coolant injection position of high concentration And the cold rolling equipment for metal strips.
제 1 항에 있어서,
상기 고농도의 쿨런트의 분사량을, 압연 속도에 따라 변화시키는 제어 설비를 갖는 것을 특징으로 하는 금속띠의 냉간 압연 설비.
The method according to claim 1,
And a control device for changing the injection amount of the high-concentration coolant in accordance with the rolling speed.
제 1 항 또는 제 2 항에 있어서,
상기 저농도 쿨런트는, 압연유의 농도가 2 ∼ 4 mass%, 상기 고농도 쿨런트는, 압연유의 농도가 10 ∼ 15 mass% 인 것을 특징으로 하는 금속띠의 냉간 압연 설비.
3. The method according to claim 1 or 2,
Wherein the low-concentration coolant has a concentration of rolling oil of 2 to 4 mass%, and the high-concentration coolant has a concentration of rolling oil of 10 to 15 mass%.
순환 급유 방식의 냉간 압연 설비로, 저농도의 쿨런트를 워크 롤 입측 근방에서 분사하고, 고농도의 쿨런트를 상기 저농도의 쿨런트의 분사 위치보다 상류측에서 분사하여 압연을 실시하는 금속띠의 냉간 압연 방법에 있어서,
상기 저농도의 쿨런트의 분사량을 압연 속도에 따라 변화시킴으로써, 상기 워크 롤 입측의 판면 상에 형성되는 저농도의 쿨런트의 액 고임부 선단이 고농도의 쿨런트의 분사 위치에 도달하지 않도록 제어하는 것을 특징으로 하는 금속띠의 냉간 압연 방법.
A cold rolling apparatus of a circulating lubrication type, comprising: a cold rolling of a metal strip for spraying a coolant of a low concentration in the vicinity of a work roll entrance and spraying a coolant of a high concentration on the upstream side of the injection position of the coolant at a low concentration, In the method,
The coolant injection amount of the low concentration is controlled in accordance with the rolling speed so that the tip of the coolant liquid impregnated portion formed on the surface of the work roll on the side of the work roll does not reach the high coolant injection position Of the metal strip.
제 4 항에 있어서,
상기 고농도의 쿨런트의 분사량을, 압연 속도에 따라 변화시키는 것을 특징으로 하는 금속띠의 냉간 압연 방법.
5. The method of claim 4,
Wherein the injection amount of the high-concentration coolant is changed in accordance with the rolling speed.
제 4 항 또는 제 5 항에 있어서,
상기 저농도 쿨런트는, 압연유의 농도가 2 ∼ 4 mass%, 상기 고농도 쿨런트는, 압연유의 농도가 10 ∼ 15 mass% 인 것을 특징으로 하는 금속띠의 냉간 압연 방법.
The method according to claim 4 or 5,
Wherein the low concentration coolant has a concentration of rolling oil of 2 to 4 mass%, and the high concentration coolant has a concentration of rolling oil of 10 to 15 mass%.
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JP2017192966A (en) 2017-10-26
EP3446800A1 (en) 2019-02-27

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