TW201825207A - Facility and method for cold rolling metal strip - Google Patents

Facility and method for cold rolling metal strip Download PDF

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Publication number
TW201825207A
TW201825207A TW106113176A TW106113176A TW201825207A TW 201825207 A TW201825207 A TW 201825207A TW 106113176 A TW106113176 A TW 106113176A TW 106113176 A TW106113176 A TW 106113176A TW 201825207 A TW201825207 A TW 201825207A
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rolling
concentration
concentration coolant
low
coolant
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TW106113176A
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Chinese (zh)
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TWI651138B (en
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平井正樹
田野口一郎
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杰富意鋼鐵股份有限公司
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices 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
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices 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
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • 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
    • B21B1/24—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 in a continuous or semi-continuous process
    • B21B1/28—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 in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • 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
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices 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
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates

Abstract

A facility for cold rolling a metal strip using a circulating-lubrication system, for jetting a low-concentration coolant in the vicinity of the entry side of a work roll, jetting a high-concentration coolant further upstream than the jetting position of the low-concentration coolant, and performing rolling, wherein the metal strip is cold rolled using a facility for cold rolling a metal strip having a control facility for changing the jetted amount of the low-concentration coolant in accordance with the rolling speed so that the distal end of a pooling of the low-concentration coolant formed on a plate surface of the entry side of the work roll does not reach the jetting position of the high-concentration coolant, whereby rolling is possible without losing plate-out properties even when the rolling speed is reduced.

Description

金屬帶的冷軋設備及冷軋方法Cold rolling equipment and cold rolling method for metal strip

本發明是有關於一種金屬帶的冷軋設備及冷軋方法，具體而言，本發明是有關於一種以循環方式進行潤滑油的供給的金屬帶的冷軋設備、及使用該冷軋設備的冷軋方法。再者，本發明中作為所述金屬帶，以「鋼板」為例進行說明。The present invention relates to a cold rolling equipment and a cold rolling method for a metal strip. Specifically, the present invention relates to a cold rolling equipment for a metal strip that supplies lubricant in a cyclic manner, and uses the cold rolling equipment. Cold rolling method. In the present invention, the "steel sheet" is used as an example of the metal strip.

金屬帶的冷軋設備根據潤滑油（軋製油）的供給方式而被分類為直接供油方式與循環供油方式此兩種，所述直接供油方式對鋼板表面直接噴射而供給軋製油，與此同時對輥表面噴射冷卻水而進行冷卻，所述循環供油方式將含有經乳液化的軋製油的冷卻水（冷卻劑）供給於鋼板或工作輥（work roll）的表面，同時進行潤滑與工作輥的冷卻。後者的循環供油方式可循環使用軋製油，故與僅可使用一次的直接供油方式相比，軋製油的成本較低，但有軋製油的濃度低故軋製性差的傾向。The cold-rolling equipment for metal strips is classified into two types of direct oil supply method and circulating oil supply method according to the supply method of lubricating oil (rolling oil). The direct oil supply method directly sprays the surface of a steel plate to supply rolling oil, and At the same time, the roll surface is sprayed with cooling water for cooling. The circulating oil supply method supplies cooling water (coolant) containing the rolling oil that has been emulsified to the surface of the steel plate or work roll, and simultaneously lubricates and Cooling of work rolls. The latter cyclic oil supply method can recycle rolling oil. Therefore, compared with the direct oil supply method which can be used only once, the cost of rolling oil is low, but the rolling oil concentration is low, and the rolling property tends to be poor.

為了消除所述循環供油方式的問題點，有效的是提高冷卻劑中的軋製油的濃度。然而，若提高軋製油的濃度，則雖然金屬帶與工作輥間的潤滑性提高，但冷卻能力降低。因此，冷卻劑中所含的軋製油的濃度通常是調整為2 mass%～4 mass%左右。In order to eliminate the problem of the circulating oil supply method, it is effective to increase the concentration of rolling oil in the coolant. However, if the concentration of the rolling oil is increased, the lubricity between the metal belt and the work roll is improved, but the cooling capacity is reduced. Therefore, the concentration of the rolling oil contained in the coolant is usually adjusted to about 2 to 4 mass%.

再者，對於循環供油方式的冷軋設備而言，有時亦必須以良好的生產性對變形阻力大的鋼種進行軋製，關於應對該要求的技術，已揭示有專利文獻1的「混合軋製」。該混合軋製技術於工作輥的入側噴射所述軋製油濃度為2 mass%～4 mass%左右的冷卻劑（以下亦稱為「低濃度冷卻劑」），此外於較所述低濃度冷卻劑的噴射位置更靠上游之側噴射軋製油濃度為10 mass%～15 mass%左右的高濃度冷卻劑（以下亦稱為「高濃度冷卻劑」）。若採用該技術，則可藉由供給高濃度冷卻劑而使大量的油分附著於板面（以下稱為「析出（plate out）」），故可提高鋼帶與工作輥間的潤滑性，降低軋製負荷。此處，為了使油分附著於板面，需要某種程度以上的時間，故為了提高析出性，高濃度冷卻劑的噴射理想的是於以某種程度遠離工作輥的上游側位置進行。 [現有技術文獻] [專利文獻]Furthermore, in the cold rolling equipment of the circulating oil supply method, it is sometimes necessary to roll a steel grade having a large deformation resistance with good productivity. As a technology to cope with this requirement, Patent Literature 1 discloses "Mixed Rolling. " In this hybrid rolling technology, a coolant having a rolling oil concentration of about 2 mass% to 4 mass% is sprayed on the inlet side of a work roll (hereinafter also referred to as a "low-concentration coolant"), and is cooled at a lower concentration than the low-concentration coolant. The high-concentration coolant (hereinafter also referred to as a “high-concentration coolant”) is sprayed with the rolling oil concentration of about 10 to 15 mass% on the upstream side of the spraying position of the coolant. If this technology is adopted, a large amount of oil can be attached to the surface of the plate by supplying a high-concentration coolant (hereinafter referred to as "plate out"), so the lubricity between the steel belt and the work roll can be improved and reduced. Rolling load. Here, it takes more than a certain amount of time for the oil to adhere to the plate surface. Therefore, in order to improve the precipitation, it is desirable to spray the high-concentration coolant away from the upstream position of the work roll to some extent. [Prior Art Literature] [Patent Literature]

[專利文獻1]日本專利特開2007-144514號公報（日本專利第4905056號公報）[Patent Document 1] Japanese Patent Laid-Open No. 2007-144514 (Japanese Patent No. 4905056)

[發明所欲解決之課題] 再者，於實際的混合軋製中，有時因軋製原材料（母板）中存在的缺陷等而必須降低軋製速度。然而，於與軋製速度無關而將低濃度冷卻劑之供給量設為一定的情形時，若軋製速度降低，則有時於工作輥入側的鋼板的板面上形成的低濃度冷卻劑的積液向上游側擴張，積液之長度變長，其上游側的前端部到達高濃度冷卻劑的噴射位置。此種狀態下，會朝向蓄積於板面上的低濃度冷卻劑噴射高濃度冷卻劑，故高濃度冷卻劑與低濃度冷卻劑混合而被稀釋，高濃度冷卻劑所含的油分並未到達板面，無法獲得混合軋製的效果。[Problems to be Solved by the Invention] Furthermore, in actual mixed rolling, it may be necessary to reduce the rolling speed due to defects or the like existing in the rolling raw material (master plate). However, when the supply amount of the low-concentration coolant is constant regardless of the rolling speed, if the rolling speed is reduced, a low-concentration coolant may be formed on the plate surface of the steel sheet on the work roll entrance side. The accumulated fluid expands to the upstream side, the length of the accumulated fluid becomes longer, and the front end portion on the upstream side reaches the injection position of the high-concentration coolant. In this state, the high-concentration coolant is sprayed toward the low-concentration coolant accumulated on the plate surface, so the high-concentration coolant is mixed with the low-concentration coolant and diluted, and the oil contained in the high-concentration coolant does not reach the plate. Surface, the effect of mixed rolling cannot be obtained.

再者，針對所述問題，可想到將高濃度冷卻劑的軋製油濃度進一步提高，但有軋製油的使用量增加而使單位用量劣化等問題。 另外，亦可想到使高濃度冷卻劑的噴射位置相較於形成低濃度冷卻劑的積液的範圍而進一步向上游側移動，但於縱列式般的冷軋設備中，機架（stand）間的距離有限制，故事實上難以實現。Further, in view of the above problems, it is conceivable to further increase the rolling oil concentration of the high-concentration coolant, but there are problems such as an increase in the amount of rolling oil used to degrade the unit usage. In addition, it is also conceivable to move the injection position of the high-concentration coolant further to the upstream side than the range where the accumulated liquid of the low-concentration coolant is formed. However, in a tandem-type cold rolling facility, a stand The distance between them is limited, so it is actually difficult to achieve.

本發明是鑒於先前技術所具有的所述問題點而成，其目的在於提供一種金屬帶的冷軋設備，並且提出一種使用所述冷軋設備的金屬帶的冷軋方法，所述金屬帶的冷軋設備為以循環方式進行混合軋製的冷軋設備，且即便於軋製速度降低時亦可進行軋製而不損及析出性。 [用以解決課題之手段]The present invention is made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a cold-rolling facility for a metal strip, and to provide a cold-rolling method for a metal strip using the cold-rolling facility. The cold rolling equipment is a cold rolling equipment that performs mixed rolling in a cyclic manner, and can be rolled without impairing the precipitation even when the rolling speed is reduced. [Means to solve the problem]

發明者等人為了解決所述課題而反覆努力研究。結果發現，為了解決所述問題點，有效的是使冷軋設備具有根據軋製速度使低濃度冷卻劑的噴射量變化的功能，以於工作輥入側的板面上形成的低濃度冷卻劑的積液前端不到達高濃度冷卻劑的噴射位置的方式，一面控制低濃度冷卻劑的噴射量一面軋製，從而完成了本發明。The inventors have been working hard to solve the problems described above. It was found that, in order to solve the problem, it is effective to provide the cold rolling equipment with a function of changing the injection amount of the low-concentration coolant according to the rolling speed, so that the low-concentration coolant formed on the plate surface of the work roll inlet side The present invention has been completed in such a manner that the front end of the accumulated liquid does not reach the injection position of the high-concentration coolant and controls the injection amount of the low-concentration coolant while rolling.

即，本發明是一種金屬帶的冷軋設備，其為於工作輥入側附近噴射低濃度冷卻劑，於較所述低濃度冷卻劑的噴射位置更靠上游之側噴射高濃度冷卻劑而進行軋製的循環供油方式的金屬帶的冷軋設備，並且其特徵在於具有控制設備，所述控制設備以於所述工作輥入側的板面上形成的低濃度冷卻劑的積液前端不到達高濃度冷卻劑的噴射位置的方式，根據軋製速度使所述低濃度冷卻劑的噴射量變化。That is, the present invention is a cold-rolling facility for a metal strip, which is performed by injecting a low-concentration coolant near the entry side of the work roll and injecting a high-concentration coolant on the upstream side from the injection position of the low-concentration coolant. The cold-rolling equipment for rolled metal belts of the circulating oil supply method is characterized in that it has control equipment which does not have a front end of a liquid accumulation of a low-concentration coolant formed on a plate surface on the work roll inlet side. The method of reaching the injection position of the high-concentration coolant changes the injection amount of the low-concentration coolant according to the rolling speed.

本發明的所述金屬帶的冷軋設備的特徵在於具有根據軋製速度使所述高濃度冷卻劑的噴射量變化的控制設備。The cold-rolling facility for a metal strip according to the present invention is characterized by having a control facility that changes a spray amount of the high-concentration coolant according to a rolling speed.

另外，本發明的所述金屬帶的冷軋設備的特徵在於：所述低濃度冷卻劑中軋製油的濃度為2 mass%～4 mass%，所述高濃度冷卻劑中軋製油的濃度為10 mass%～15 mass%。In addition, the cold-rolling equipment for the metal strip of the present invention is characterized in that the concentration of the rolling oil in the low-concentration coolant is 2 mass% to 4 mass%, and the concentration of the rolling oil in the high-concentration coolant is 10 mass% ～ 15 mass%.

另外，本發明提出一種金屬帶的冷軋方法，其利用循環供油方式的冷軋設備於工作輥入側附近噴射低濃度冷卻劑，於較所述低濃度冷卻劑的噴射位置更靠上游之側噴射高濃度冷卻劑而進行軋製，並且所述金屬帶的冷軋方法的特徵在於：根據軋製速度使所述低濃度冷卻劑的噴射量變化，藉此以於所述工作輥入側的板面上形成的低濃度冷卻劑的積液前端不到達高濃度冷卻劑的噴射位置的方式進行控制。In addition, the present invention proposes a cold rolling method for a metal strip, which uses a cold rolling equipment of a circulating oil supply method to spray a low-concentration coolant near the entry side of a work roll, and is located more upstream than the low-concentration coolant injection position. The high-concentration coolant is sprayed and rolled on the side, and the cold rolling method of the metal strip is characterized in that the injection amount of the low-concentration coolant is changed in accordance with the rolling speed, so that the work roll enters the side. Control is performed so that the front end of the accumulated liquid of the low-concentration coolant formed on the plate surface does not reach the injection position of the high-concentration coolant.

本發明的所述金屬帶的冷軋方法的特徵在於根據軋製速度使所述高濃度冷卻劑的噴射量變化。The cold rolling method of the metal strip according to the present invention is characterized in that the injection amount of the high-concentration coolant is changed according to a rolling speed.

另外，本發明的所述金屬帶的冷軋方法的特徵在於：所述金屬帶的冷軋方法中所用的所述低濃度冷卻劑中軋製油的濃度為2 mass%～4 mass%，所述高濃度冷卻劑中軋製油的濃度為10 mass%～15 mass%。 [發明的效果]In addition, the cold rolling method of the metal strip according to the present invention is characterized in that the concentration of rolling oil in the low-concentration coolant used in the cold rolling method of the metal strip is 2 mass% to 4 mass%, and The concentration of the rolling oil in the high-concentration coolant is 10 mass% to 15 mass%. [Effect of the invention]

根據本發明，以於工作輥入側的板面上形成的低濃度冷卻劑的積液前端不到達高濃度冷卻劑的噴射位置的方式進行控制，故可充分獲得混合軋製的效果。According to the present invention, since the accumulated liquid tip of the low-concentration coolant formed on the plate surface on the work roll inlet side is controlled so as not to reach the injection position of the high-concentration coolant, the effect of mixed rolling can be sufficiently obtained.

圖1為對現有的循環方式的冷軋設備中採用混合軋製技術時的冷卻劑的供給系統進行說明的圖。利用工作輥2將鋼板1軋製成既定的板厚。此時，藉由噴霧泵8自噴霧頭3將低濃度冷卻劑噴射至鋼板表面，提高鋼板1與工作輥2間的潤滑性，與此同時進行工作輥2的冷卻。此後，噴射至鋼板表面並經使用的低濃度冷卻劑自油盤11被回收至設置於油盒（oil cellar）中的回流箱（return tank）4中，藉由回流泵（return pump）5經由位於地上的過濾器6而回到潔淨箱（clean tank）7中，被循環使用。此時，自噴霧頭3噴射至鋼板表面的低濃度冷卻劑於板上表面朝向上游側形成長度X的積液10。FIG. 1 is a diagram explaining a coolant supply system when a hybrid rolling technology is used in a conventional cyclic cold rolling facility. The steel sheet 1 is rolled to a predetermined thickness with a work roll 2. At this time, a low-concentration coolant is sprayed from the spray head 3 to the surface of the steel plate by the spray pump 8 to improve the lubricity between the steel plate 1 and the work roll 2, and at the same time, the work roll 2 is cooled. Thereafter, the low-concentration coolant sprayed onto the surface of the steel plate is recovered from the oil pan 11 to a return tank 4 provided in an oil cellar, and is returned by a return pump 5 through The filter 6 located on the ground returns to the clean tank 7 and is recycled. At this time, the low-concentration coolant sprayed from the spray head 3 to the surface of the steel plate forms a scum 10 of length X on the surface of the plate toward the upstream side.

另一方面，高濃度冷卻劑是於高濃度冷卻劑箱12中經調和，藉由噴霧泵13自噴霧頭9被噴射至鋼板表面。噴射並經使用的高濃度冷卻劑是藉由上文所述的油盤11而被回收，與低濃度冷卻劑混合，作為低濃度冷卻劑而被循環使用。再者，為了充分確保油分附著於板面的時間而提高析出性，高濃度冷卻劑的噴霧頭9是設置於較低濃度冷卻劑的噴射位置更靠上游側，且於上游側以距離L遠離工作輥的位置。此處，圖中的14為具有將因前機架的軋製而附著於鋼板表面的冷卻劑去除的功能的除水輥。On the other hand, the high-concentration coolant is conditioned in the high-concentration coolant tank 12 and sprayed onto the surface of the steel plate from the spray head 9 by the spray pump 13. The high-concentration coolant injected and used is recovered by the oil pan 11 described above, mixed with the low-concentration coolant, and recycled as a low-concentration coolant. In addition, in order to sufficiently ensure the time for the oil to adhere to the surface of the plate and improve the precipitation, the spray head 9 of the high-concentration coolant is disposed on the upstream side of the injection position of the lower-concentration coolant, and away from the upstream side by a distance L. The position of the work roll. Here, 14 in the figure is a dewatering roller having a function of removing the coolant adhering to the surface of the steel plate by rolling the front frame.

圖2示意性地表示軋製速度V與於工作輥入側的板面上形成的低濃度冷卻劑的積液的長度X之關係。被引入至輥縫（roll bite）中的軋製油的量視軋製速度V而變化，因此若軋製速度低則積液的長度X變長，若軋製速度高則積液的長度X變短。FIG. 2 schematically shows the relationship between the rolling speed V and the length X of the accumulated liquid of the low-concentration coolant formed on the plate surface on the work roll entrance side. The amount of rolling oil introduced into the roll bite varies depending on the rolling speed V. Therefore, if the rolling speed is low, the length X of the scum will increase, and if the rolling speed is high, the length X of the scum will change. short.

另外，圖3示意性地表示軋製速度V降低時的低濃度冷卻劑的積液長度X、與於上游側以距離L遠離工作輥而設置的高濃度冷卻劑的噴霧頭設置位置之關係，於軋製速度V低時，低濃度冷卻劑的積液長度X變得較工作輥2與高濃度冷卻劑的噴霧頭9的設置位置間的距離L長，有時亦到達除水輥14的位置。In addition, FIG. 3 schematically shows the relationship between the accumulated liquid length X of the low-concentration coolant when the rolling speed V is reduced, and the spray head installation position of the high-concentration coolant installed away from the work roll at a distance L from the upstream side. When the rolling speed V is low, the accumulated liquid length X of the low-concentration coolant becomes longer than the distance L between the work roll 2 and the installation position of the spray head 9 of the high-concentration coolant, and sometimes reaches the drain roll 14 position.

另外，圖4示意性地表示低濃度冷卻劑的噴射量Q與低濃度冷卻劑的積液長度X之關係。積液的長度X視低濃度冷卻劑的噴射量Q而變化，若噴射量Q變小則積液的長度X變短，若噴射量Q變大則積液的長度X變長。In addition, FIG. 4 schematically shows the relationship between the injection amount Q of the low-concentration coolant and the accumulated liquid length X of the low-concentration coolant. The length X of the effusion varies depending on the injection amount Q of the low-concentration coolant. When the injection amount Q becomes smaller, the length X of the effusion becomes shorter. When the injection amount Q becomes larger, the length X of the effusion becomes longer.

因此，本發明於軋製速度V降低時，減少低濃度冷卻劑的噴射量Q，使低濃度冷卻劑的積液長度X較工作輥2與高濃度冷卻劑的噴霧頭9的設置位置間的距離L短，即，使積液的上游側前端不到達高濃度冷卻劑的噴霧頭的設置位置，由此可一直對鋼板表面直接噴射高濃度冷卻劑。即，本發明於以下方面具有特徵：根據軋製速度V調整低濃度冷卻劑的噴射量Q，由此實現析出性優異的冷軋。Therefore, in the present invention, when the rolling speed V is reduced, the injection amount Q of the low-concentration coolant is reduced, so that the liquid accumulation length X of the low-concentration coolant is longer than the position between the work roll 2 and the installation position of the spray head 9 of the high-concentration coolant. The distance L is short, that is, the upstream end of the accumulated liquid does not reach the installation position of the spray head of the high-concentration coolant, so that the high-concentration coolant can be directly sprayed on the surface of the steel plate at all times. That is, the present invention is characterized in that the cold rolling excellent in the precipitation property is achieved by adjusting the injection amount Q of the low-concentration coolant according to the rolling speed V.

於圖5中示出根據軋製速度調整低濃度冷卻劑噴射量的本發明的冷軋設備的冷卻劑供給系統圖的一例。於低濃度冷卻劑的供給系統中設置流量調節閥17，根據來自工作輥的驅動馬達16的軋製速度指令，由分散控制系統DCS（Distributed Control System）15計算出低濃度冷卻劑的積液長度X較直至高濃度冷卻劑的噴射位置為止的距離L短的低濃度冷卻劑的噴射量Q，將該結果作為開度指令而給予設置於低濃度冷卻劑供給系統中的流量調節閥17。FIG. 5 shows an example of a coolant supply system diagram of a cold rolling facility according to the present invention in which a low-concentration coolant injection amount is adjusted according to a rolling speed. A flow regulating valve 17 is provided in the low-concentration coolant supply system, and the liquid accumulation length of the low-concentration coolant is calculated from the distributed control system DCS (Distributed Control System) 15 based on the rolling speed command from the drive motor 16 of the work roll. X is shorter than the injection amount Q of the low-concentration coolant shorter than the distance L to the injection position of the high-concentration coolant, and this result is given to the flow rate adjustment valve 17 provided in the low-concentration coolant supply system as an opening degree command.

再者，若即便於軋製速度降低時亦以與軋製速度高時相同的量噴射高濃度冷卻劑，則噴射至鋼板表面的軋製油變多，故潤滑性提高。然而，若潤滑性變得過高，則成為引起滑動（slip）或振動（chattering）等軋製異常的原因。因此，高濃度冷卻劑的噴射量亦若根據軋製速度進行調整，則可供給冷軋所必需的最佳的油分，因此可穩定地進行冷軋。In addition, if the high-concentration coolant is sprayed in the same amount as when the rolling speed is high even when the rolling speed is reduced, the rolling oil sprayed onto the surface of the steel sheet increases, and the lubricity is improved. However, if the lubricity becomes too high, it may cause rolling abnormalities such as slip and chattering. Therefore, if the injection amount of the high-concentration coolant is adjusted in accordance with the rolling speed, the optimum oil content necessary for cold rolling can be supplied, and cold rolling can be performed stably.

為了根據軋製速度調整高濃度冷卻劑的噴射量，只要與低濃度冷卻劑的情形同樣地，於高濃度冷卻劑的供給系統中設置流量調節閥，根據軋製速度指令將高濃度冷卻劑的噴射量控制於更正範圍內即可。 通常若軋製速度變高，則軋製負荷增高，故必須增大所供給的軋製油的噴射量，但於如所述般根據軋製速度調整高濃度冷卻劑的噴射量的情形時，可根據軋製速度噴射最佳的軋製油量。 [實施例]In order to adjust the injection amount of the high-concentration coolant according to the rolling speed, as long as the low-concentration coolant is used, a flow regulating valve is provided in the high-concentration coolant supply system, and the high-concentration coolant is adjusted according to the rolling speed command. The injection amount may be controlled within the correction range. In general, if the rolling speed becomes higher, the rolling load becomes higher, so the injection amount of the supplied rolling oil must be increased. However, when the injection amount of the high-concentration coolant is adjusted according to the rolling speed as described above, The optimum amount of rolling oil is sprayed according to the rolling speed. [Example]

圖6表示於實際軋製機中使軋製速度變化為200 m/min、400 m/min及1000 m/min三個階段時的低濃度冷卻劑的噴射量Q與於板面上形成的低濃度冷卻劑的積液的長度X之關係。 此處，圖中的A點表示軋製速度V＝1000 mpm、將低濃度冷卻劑的噴射量設為最大的Qmax 而軋製時的積液長度X。於該A點處，軋製速度高，每單位時間的加工放熱量多，故使低濃度冷卻劑的噴射流量為最大的Qmax 進行噴射而將工作輥冷卻，但被引入至輥縫間的低濃度冷卻劑的量亦多，故積液的長度X較工作輥與高濃度冷卻劑噴霧頭設置位置間的距離L短。 此處，於因軋製原材料存在缺陷等某些原因而軋製速度降低的情形時，如圖2所示般積液的長度變長。例如若將軋製速度V自1000 mpm降低至400 mpm，則積液的長度X自A點移動至B點，積液長度變得較工作輥與高濃度冷卻劑噴霧頭設置位置間的距離L長。 因此，若將低濃度冷卻劑的噴射量自Qmax 減少至Q1 ，則積液長度X移動至C點，積液長度X變得較工作輥與高濃度冷卻劑噴霧頭設置位置間的距離L短。此時，因低濃度冷卻劑的噴射量減少，導致輥冷卻能力亦降低，但因軋製速度降低而每單位時間的加工放熱量亦變小，故不產生問題。 另外，於因出側卷分割等而進一步將軋製速度V自400 mpm降低至200 mpm的情形時，亦若將低濃度冷卻劑噴射的流量減小至Q2 ，則積液的長度X自C點移動至D點，故積液的長度X變得較工作輥與高濃度冷卻劑噴霧頭設置位置間的距離L短。Fig. 6 shows the injection amount Q of the low-concentration coolant when the rolling speed is changed to three stages of 200 m / min, 400 m / min, and 1000 m / min in an actual rolling mill, and the low level of the coolant formed on the plate surface. The relationship between the length X of the accumulated liquid of the concentrated coolant. Here, point A in the figure represents a rolling speed V = 1000 mpm, and a liquid accumulation length X during rolling with the injection amount of the low-concentration coolant at the maximum Q max . At this point A, the rolling speed is high and the amount of heat released per unit time is large. Therefore, the work roll is cooled by spraying with the maximum flow rate of the low concentration coolant at Q max , but it is introduced into the roll gap. The amount of low-concentration coolant is also large, so the length X of the accumulated liquid is shorter than the distance L between the work roll and the installation position of the high-concentration coolant spray head. Here, when the rolling speed is reduced due to some reasons such as defects in the rolling raw materials, the length of the stagnant fluid becomes long as shown in FIG. 2. For example, if the rolling speed V is reduced from 1000 mpm to 400 mpm, the length X of the accumulated liquid is moved from point A to point B, and the length of the accumulated liquid becomes longer than the distance L between the work roll and the installation position of the high-concentration coolant spray head. long. Therefore, if the injection amount of the low-concentration coolant is reduced from Q max to Q 1 , the liquid accumulation length X moves to the point C, and the liquid accumulation length X becomes longer than the distance between the work roll and the installation position of the high-concentration coolant spray head. L is short. At this time, because the amount of low-concentration coolant is reduced, the cooling capacity of the roll is also reduced, but because the rolling speed is reduced, the amount of heat generated per unit time is also reduced, so no problem occurs. In addition, when the rolling speed V is further reduced from 400 mpm to 200 mpm due to the exit coil division, etc., if the flow rate of the low-concentration coolant injection is reduced to Q 2 , the length X of the effusion The point C moves to the point D, so the length X of the accumulated liquid becomes shorter than the distance L between the work roll and the installation position of the high-concentration coolant spray head.

1‧‧‧金屬帶（鋼板）1‧‧‧ metal strip (steel plate)

2‧‧‧工作輥2‧‧‧Working roller

3‧‧‧低濃度冷卻劑噴霧頭3‧‧‧ low concentration coolant spray head

4‧‧‧回流箱4‧‧‧Return Box

5‧‧‧回流泵5‧‧‧ Return Pump

6‧‧‧過濾器6‧‧‧ Filter

7‧‧‧潔淨箱7‧‧‧clean box

8‧‧‧噴霧泵8‧‧‧ spray pump

9‧‧‧高濃度冷卻劑噴霧頭9‧‧‧ high concentration coolant spray head

10‧‧‧低濃度冷卻劑的積液10‧‧‧ effusion of low concentration coolant

11‧‧‧油盤11‧‧‧oil pan

12‧‧‧高濃度冷卻劑箱12‧‧‧High-concentration coolant tank

13‧‧‧高濃度冷卻劑噴霧泵13‧‧‧High concentration coolant spray pump

14‧‧‧除水輥14‧‧‧ Dewatering roller

15‧‧‧分散控制系統15‧‧‧ Distributed Control System

16‧‧‧工作輥的驅動馬達16‧‧‧Drive motor for work roll

17‧‧‧低濃度冷卻劑的流量調節閥17‧‧‧ Flow regulating valve for low concentration coolant

L‧‧‧工作輥與高濃度冷卻劑的噴霧頭的設置位置間的距離L‧‧‧ The distance between the work roll and the installation position of the spray head of high concentration coolant

X‧‧‧積液的長度X‧‧‧ length of effusion

圖1為對現有的混合軋製中的軋製油的供給系統進行說明的圖。 圖2為表示軋製速度V與積液長度X之關係的示意圖。 圖3為對軋製速度低時積液的前端到達高濃度冷卻劑的噴射位置的狀態進行說明的圖。 圖4為表示低濃度冷卻劑的噴射量Q與積液長度X之關係的示意圖。 圖5為對根據軋製速度控制低濃度冷卻劑的噴射量的本發明的冷軋設備中的軋製油的供給系統的一例進行說明的圖。 圖6為對本發明的冷軋方法中的低濃度冷卻劑的噴射量的控制方法進行說明的圖。FIG. 1 is a diagram explaining a rolling oil supply system in a conventional mixed rolling. FIG. 2 is a schematic diagram showing a relationship between a rolling speed V and a liquid accumulation length X. FIG. FIG. 3 is a diagram illustrating a state where the tip of the scum 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 accumulated liquid length X. FIG. FIG. 5 is a diagram illustrating an example of a rolling oil supply system in a cold rolling facility according to the present invention that controls the injection amount of a low-concentration coolant according to a rolling speed. It is a figure explaining the control method of the injection amount of a low-concentration coolant in the cold rolling method of this invention.

Claims (6)

一種金屬帶的冷軋設備，其為於工作輥入側附近噴射低濃度冷卻劑，於較所述低濃度冷卻劑的噴射位置更靠上游之側噴射高濃度冷卻劑而進行軋製的循環供油方式的金屬帶的冷軋設備，並且所述金屬帶的冷軋設備的特徵在於： 具有控制設備，所述控制設備以於所述工作輥入側的板面上形成的所述低濃度冷卻劑的積液前端不到達所述高濃度冷卻劑的噴射位置的方式，根據軋製速度使所述低濃度冷卻劑的噴射量變化。A cold-rolling equipment for a metal strip, which is used for injecting a low-concentration coolant near the entry side of a work roll, and injecting a high-concentration coolant on an upstream side from a position where the low-concentration coolant is sprayed to perform rolling circulation. An oil-based cold-rolling facility for a metal strip, and the cold-rolling facility for a metal strip is characterized by having control equipment that cools at the low concentration formed on a plate surface on the work roll inlet side. The amount of the low-concentration coolant to be sprayed is changed in accordance with the rolling speed so that the front end of the accumulated liquid does not reach the high-concentration coolant injection position. 如申請專利範圍第1項所述的金屬帶的冷軋設備，其具有根據軋製速度使所述高濃度冷卻劑的噴射量變化的控制設備。The cold-rolling equipment for a metal strip according to item 1 of the scope of patent application has control equipment for changing the injection amount of the high-concentration coolant according to the rolling speed. 如申請專利範圍第1項或第2項所述的金屬帶的冷軋設備，其中所述低濃度冷卻劑中軋製油的濃度為2 mass%～4 mass%，所述高濃度冷卻劑中軋製油的濃度為10 mass%～15 mass%。The cold rolling equipment for a metal strip according to item 1 or 2 of the scope of the patent application, wherein the concentration of the rolling oil in the low-concentration coolant is 2 mass% to 4 mass%, and the high-concentration coolant is rolled in the middle. The concentration of oil production is 10 mass% to 15 mass%. 一種金屬帶的冷軋方法，利用循環供油方式的冷軋設備於工作輥入側附近噴射低濃度冷卻劑，於較所述低濃度冷卻劑的噴射位置更靠上游之側噴射高濃度冷卻劑而進行軋製，並且所述金屬帶的冷軋方法的特徵在於： 根據軋製速度使所述低濃度冷卻劑的噴射量變化，藉此以於所述工作輥入側的板面上形成的所述低濃度冷卻劑的積液前端不到達所述高濃度冷卻劑的噴射位置的方式進行控制。A cold-rolling method for a metal strip, which uses a cold-rolling equipment of a circulating oil supply method to spray a low-concentration coolant near the entry side of a work roll, and spray a high-concentration coolant on an upstream side from a position where the low-concentration coolant is sprayed. The rolling is performed, and the cold rolling method of the metal strip is characterized in that: the spray amount of the low-concentration coolant is changed according to a rolling speed, and thereby the Control is performed so that the front end of the accumulated liquid of the low-concentration coolant does not reach the injection position of the high-concentration coolant. 如申請專利範圍第3項所述的金屬帶的冷軋方法，其中根據軋製速度使所述高濃度冷卻劑的噴射量變化。The method for cold rolling a metal strip according to item 3 of the scope of patent application, wherein the injection amount of the high-concentration coolant is changed according to a rolling speed. 如申請專利範圍第4項或第5項所述的金屬帶的冷軋方法，其中所述低濃度冷卻劑中軋製油的濃度為2 mass%～4 mass%，所述高濃度冷卻劑中軋製油的濃度為10 mass%～15 mass%。The method for cold rolling a metal strip according to item 4 or item 5 of the scope of the patent application, wherein the concentration of the rolling oil in the low-concentration coolant is 2 mass% to 4 mass%, and the high-concentration coolant is rolled in the middle. The concentration of oil production is 10 mass% to 15 mass%.
TW106113176A 2016-04-21 2017-04-20 Metal strip cold rolling equipment and cold rolling method TWI651138B (en)

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