KR100431834B1 - A Method for Cooling Hot-Rolled Steel Sheet - Google Patents
A Method for Cooling Hot-Rolled Steel Sheet Download PDFInfo
- Publication number
- KR100431834B1 KR100431834B1 KR10-1999-0040868A KR19990040868A KR100431834B1 KR 100431834 B1 KR100431834 B1 KR 100431834B1 KR 19990040868 A KR19990040868 A KR 19990040868A KR 100431834 B1 KR100431834 B1 KR 100431834B1
- Authority
- KR
- South Korea
- Prior art keywords
- steel sheet
- rolled steel
- cooling
- correction coefficient
- hot
- Prior art date
Links
Classifications
-
- 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
- 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
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
-
- 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
- B21B2001/225—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 hot-rolling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
본 발명은 고온의 열연강판을 수냉각설비를 이용하여 냉각하는 방법에 관한 것으로서, 열연강판의 냉각시 주위 공기조건변화를 주수량 결정에 반영하여 온도제어를 보다 정확히 할 수 있는 열연강판의 냉각방법을 제공하고자 하는데, 그 목적이 있다.The present invention relates to a method of cooling a hot-rolled hot rolled steel sheet using a water cooling system. The method of cooling a hot-rolled steel sheet which can more accurately control temperature by reflecting a change in ambient air condition when determining the amount of water during cooling of the hot-rolled steel sheet. It is intended to provide a purpose.
본 발명은 열연강판의 냉각방법에 있어서, 상기 열연강판의 냉각시 주위공기중의 수분잔량과 보정계수와의 상관관계식을 구하고, 다음 열연강판의 냉각시 주위 공기중의 수분잔량을 구하고, 이것을 상기 보정계수와의 상관관계식에 대입하여 수정 보정계수를 구하고, 이 수정 보정계수와 가장 최근에 동일 소재의 제조에 대하여 학습함으로써 구해진 보정계수를 이용하여 가중평균법에 의해 최종 보정계수를 구하고, 이 최종보정계수를 다음에 제조할 동일한 소재조건을 갖는 열연강판 냉각과정에 적용하여 보정 주수량을 구하여 열연강판을 냉각하는 방법을 그 요지로 한다.According to the present invention, in the method for cooling a hot rolled steel sheet, a correlation between a residual amount of moisture in ambient air and a correction coefficient during cooling of the hot rolled steel sheet is obtained, and a residual amount of moisture in ambient air during cooling of the next hot rolled steel sheet is obtained. The correction correction coefficient is obtained by substituting the correlation coefficient with the correction coefficient, and the final correction coefficient is obtained by the weighted average method using the correction coefficient obtained by learning the correction correction coefficient and the most recent manufacture of the same material. The main idea is to cool the hot rolled steel sheet by applying the coefficient to the cooling process of hot rolled steel sheet having the same material conditions to be manufactured next.
Description
본 발명은 제철소의 열연강판 생산과정중 열간압연을 마친 고온강판을 수냉각설비를 이용하여 냉각하는 방법에 관한 것으로서, 보다 상세하게는, 주위 공기조건변화를 주수량 결정에 반영하여 온도제어를 보다 정확히 할 수 있는 열연강판의 냉각방법에 관한 것이다.The present invention relates to a method for cooling a hot-rolled steel sheet that has been hot-rolled during the production of hot-rolled steel sheet in a steel mill using a water cooling system. It relates to a method of cooling a hot rolled steel sheet that can be accurately.
통상적으로, 열간압연기에서 열간압연된 열연강판은 목적하는 기계적 성질을 확보하기 위하여 수냉각설비에 의해 수냉된다.Typically, hot rolled steel sheets hot rolled in a hot rolling machine are water cooled by a water cooling facility to secure desired mechanical properties.
상기 수냉각설비에 의한 수냉시 목적하는 열연강판의 기계적성질을 얻기위해서는 적절한 주수량을 결정하는 것이 중요하다.In order to obtain the mechanical properties of the target hot rolled steel sheet during water cooling by the water cooling facility, it is important to determine an appropriate amount of main water.
종래에는 다음과 같이 적절한 주수량을 결정하여 열간압연강판을 냉각하였다.In the related art, an appropriate amount of pouring water was determined as follows to cool the hot rolled steel sheet.
즉, 종래에는 목표냉각종료온도를 설정하고, 현재 제조하고자 하는 열연강판의 소재조건을 이용하여 상기 목표냉각종료온도를 얻을 수 있는 주수량을 결정하고, 상기와 같이 결정된 주수량을 주수하여 열연강판을 냉각시키고, 상기 열연강판의 냉각시 열연강판의 냉각종료온도를 측정하고, 상기와 같이 측정된 열연강판의 냉각종료온도와 목표냉각종료온도와의 차이를 구하고, 상기 측정 냉각종료온도와 목표냉각종료온도와의 차이가 목표 오차 범위내에 오도록 하는 보정계수를 학습을 통해 구하고, 상기와 같이 구한 보정계수를 다음에 생산할 동일한 소재조건을 갖는 열연강판 냉각과정에 적용하여, 냉각종료온도와 목표냉각온도와의 차이가 목표오차범위내에 오도록 하는 보정 주수량을 구하여 열연강판을 냉각하였다.That is, in the related art, the target cooling end temperature is set, the amount of water to obtain the target cooling end temperature is determined by using the material condition of the hot-rolled steel sheet to be manufactured at present, and the hot-rolled steel sheet is injected by pouring the determined main water quantity The cooling end temperature of the hot-rolled steel sheet during cooling of the hot-rolled steel sheet is measured, and the difference between the cooling end temperature and the target cooling end temperature of the hot-rolled steel sheet measured as described above is calculated, and the measured cooling end temperature and target cooling Obtain the correction coefficient so that the difference between the end temperature is within the target error range through learning, and apply the correction coefficient obtained above to the cooling process of hot rolled steel sheet having the same material conditions to be produced next time, and then the cooling end temperature and target cooling temperature. The hot-rolled steel sheet was cooled by calculating the corrected main water quantity so that the difference between and was within the target error range.
상기한 종래방법에 있어서 냉각능력 보정계수는 현재 생산하고자 하는 소재와 동일한 강종, 두께, 그리고 생산속도를 갖는 가장 최근의 소재 및 운전조건 정보를 이용하여, 주위 공기조건 변화가 무시된 상태에서, 학습한 결과로부터 얻어진다.In the above-described conventional method, the cooling capacity correction coefficient is learned using the latest material and operating condition information having the same steel grade, thickness, and production speed as the material to be produced. From one result.
여기서 학습이란 도 1에 나타난 바와 같이, 강종, 두께정보와 함께 냉각개시온도,생산속도, 그리고 실적 주수량의 분포등을 이용하여 공냉 및 수냉에 의한 냉각효과를 고려할 수 있는 단순온도강하량 예측식 또는 차분식 등을 적용하여 실적 냉각종료온도와 일치되는 값이 얻어지도록 정확한 수냉의 냉각효과를 예측해 줄 수 있는 보정값을 구한다는 것이다. 이렇게 구해진 값, 즉 보정계수는 다음의 같은 강종, 두께, 생산속도의 소재가 생산될 때 적용되어 목표냉각종료온도가 정확하게 얻어질 수 있도록 한다.Here, as shown in FIG. 1, a simple temperature drop prediction formula that can consider cooling effect by air cooling and water cooling using steel type, thickness information, cooling start temperature, production speed, and distribution of performance main quantity. By applying a differential equation, a correction value can be obtained to predict the cooling effect of water cooling accurately so that a value consistent with the actual cooling end temperature can be obtained. The calculated value, that is, the correction factor, is applied when the following steel grade, thickness, and production speed are produced, so that the target cooling end temperature can be accurately obtained.
상기한 바와 같이, 어떤 소재에 대해 적용된 보정계수와 생산후 학습해서 얻어진 보정계수가 크게 다르면 실제 얻어진 냉각종료온도가 목표냉각종료온도와 큰 차이가 있다는 것이며, 이를 소재 전체 길이(통상 수백 m이상 때로 수 km에 달함)에 대해 통상 제어 오차가 ±20℃내에 길이의 비율로 적중율을 관리하여 왔다.As described above, if the correction factor applied for a certain material is different from the correction factor obtained after learning, the actual cooling end temperature is significantly different from the target cooling end temperature. Up to several km), the control error has normally been managed at a rate of length within ± 20 ° C.
따라서, 통상 90% 근처인 적중율을 1%높일 수 있다는 것은 소재길이중 수 m 또는 수십 m가 목표하는 재질을 갖을 수 있어 제품으로서 가치를 갖게 된다는 것이다.Therefore, the fact that the hit ratio, which is usually around 90%, can be increased by 1% means that several m or tens of m of the material length can have a target material and thus have a value as a product.
그런데, 현장 조업결과를 분석하여 보면 계절별로 또는 주위온도 조건의 변화가 심한 밤과 낮의 조건에서, 또는 공장이 계속해서 운전되는 경우와 그렇지 않고 정비등의 사유로 장시간 서있다가 조업이 개시되는 조건사이에서 볼 때 적용된 보정계수와 학습에서 구해진 보정계수는 크게 차이가 있는 것으로 드러났다.By analyzing the results of the site operation, however, during the night and day conditions where the change of the ambient temperature conditions is severe, or when the plant is continuously operated and otherwise it stands for a long time due to maintenance, The results show that there is a significant difference between the applied correction coefficients and those obtained in learning.
특히, 계절적인 차이가 매우 두드러지게 나타나고 있다.In particular, seasonal differences are very prominent.
도 2는 약 1년간 동일강종에 대한 학습된 냉각능 보정계수의 변화를 조사하여 나타낸 것으로서, 동절기와 하절기 사이에 약 20%의 냉각능력 변화가 있음을 보여준다.Figure 2 shows the changes in the learning cooling coefficient correction coefficient for the same steel for about one year, showing that there is about 20% change in cooling capacity between winter and summer.
특히, 일반적 예상과는 달리 동절기에 비해 하절기 근처에서 냉각능력이 크게 나타나는 것을 알 수 있다.In particular, contrary to the general expectation, it can be seen that the cooling capacity is greater in the summer season than in the winter season.
따라서, 주위공기 조건이 냉각능력에 미치는 영향이 있음을 알 게 되었는 데, 그럼에도 불구하고 정확하게 어떤 영향이 있는 가를 알 수 없어 온도제어에 반영할 방법이 없었다.Therefore, it was found that the ambient air condition had an effect on the cooling capacity. Nevertheless, there was no way to reflect the temperature control because it did not know exactly what effect.
본 발명자들은 열연강판의 냉각시 주위공기 조건이 냉각능력에 미치는 영향에 대하여 연구 및 실험을 행하고, 그 결과에 근거하여 본 발명을 제안하게 된 것으로써, 본 발명은 열연강판의 냉각시 주위 공기조건변화를 주수량 결정에 반영하여 온도제어를 보다 정확히 할 수 있는 열연강판의 냉각방법을 제공하고자 하는데, 그 목적이 있다.The present inventors have conducted studies and experiments on the effect of the ambient air conditions on the cooling capacity of the hot rolled steel sheet, and proposed the present invention based on the results. The purpose of the present invention is to provide a method for cooling hot rolled steel sheets that can accurately control temperature by reflecting the change in the determination of the amount of main water.
도 1은 통상적인 열간압연강판의 냉각방법에 있어서 냉각능 보정계수를 구 하는 방법에 대한 흐름도1 is a flow chart of a method for obtaining a cooling capacity correction coefficient in a conventional method for cooling a hot rolled steel sheet.
도 2는 계절에 따른 냉각능 보정계수의 변화를 나타내는 그래프2 is a graph showing the change of the cooling capacity correction coefficient according to the season
도 3은 주위 공기조건에 따른 냉각능변화 실험결과도3 is a test result of the cooling capacity change according to the ambient air conditions
도 4는 계절에 따른 포화가능 수증기량과 냉각능 보정계수 변화를 비교한 그래프4 is a graph comparing the change in the amount of saturated steam and the cooling capacity correction coefficient according to the season;
도 5는 실제 측정된 포화가능 수증기량과 보정계수와의 상관관계를 나타내 는 그래프5 is a graph showing the correlation between the actual measured saturable water vapor and the correction coefficient
도 6은 학습후 얻어진 종래 보정계수와 본 발명에 따라 보정된 보정계수를 비교한 비교도6 is a comparison diagram comparing the correction coefficient corrected according to the present invention with the conventional correction coefficient obtained after learning
도 7은 종래의 보정계수 및 본 발명에 의한 적중율을 나타내는 그래프7 is a graph showing a conventional correction coefficient and the hit ratio according to the present invention
본 발명은 목표냉각종료온도를 설정하는 단계;The present invention comprises the steps of setting a target cooling end temperature;
현재 제조하고자 하는 열연강판의 소재조건을 이용하여 상기 목표냉각종료온도를 얻을 수 있는 주수량을 결정하는 단계;Determining the amount of water to obtain the target cooling end temperature by using the material conditions of the hot-rolled steel sheet to be manufactured;
상기와 같이 결정된 주수량을 주수하여 열연강판을 냉각시키는 단계;Pouring hot water determined as described above to cool the hot rolled steel sheet;
상기 열연강판의 냉각시 열연강판의 냉각종료온도를 측정하는 단계;Measuring a cooling end temperature of the hot rolled steel sheet when the hot rolled steel sheet is cooled;
상기와 같이 측정된 열연강판의 냉각종료온도와 목표냉각종료온도와의 차이를 구하는 단계;Obtaining a difference between the cooling end temperature and the target cooling end temperature of the hot-rolled steel sheet measured as described above;
상기 측정 냉각종료온도와 목표냉각종료온도와의 차이가 목표 오차 범위내에 오도록 하는 보정계수를 학습을 통해 구하는 단계; 및Obtaining through a learning a correction coefficient such that a difference between the measured cooling end temperature and a target cooling end temperature is within a target error range; And
상기와 같이 구한 보정계수를 다음에 생산할 동일한 소재조건을 갖는 열연강판 냉각과정에 적용하여, 냉각종료온도와 목표냉각온도와의 차이가 목표오차범위내에 오도록 하는 보정 주수량을 구하여 열연강판을 냉각하는 단계를 포함하는 것으로 구성되는 열연강판의 냉각방법에 있어서,By applying the correction factor obtained as described above to the process of cooling the hot rolled steel sheet having the same material condition to be produced next time, cooling the hot rolled steel sheet by obtaining the correction main quantity so that the difference between the cooling end temperature and the target cooling temperature is within the target error range. In the method of cooling a hot rolled steel sheet comprising a step,
상기 열연강판의 냉각시 주위공기중의 수분잔량(단위 질량당의 공기가 갖을 수 있는 최대 수분량(무게)에서 현재 단위 질량당의 공기가 갖고 있는 수분량(무게)을 뺀 값)과 상기 보정계수와의 상관관계식을 구하는 단계;Correlation between the amount of moisture remaining in the ambient air during cooling of the hot rolled steel sheet (maximum amount of water (weight) that air can have per unit mass minus the amount of water (weight) that air currently has per unit mass) and the correction coefficient) Obtaining a relation;
다음 열연강판의 냉각시 주위온도와 습도를 측정하고, 이 주위온도에서 포화될 수 있는 수증기량을 구하여 주위공기중의 수분잔량을 구하는 단계;Next, measuring the ambient temperature and humidity during cooling of the hot-rolled steel sheet, obtains the amount of water vapor that can be saturated at the ambient temperature to obtain the residual amount of moisture in the ambient air;
상기와 같이 구한 수분잔량을 상기 수분잔량과 상기 보정계수와의 상관관계식에 대입하여 수정 보정계수를 구하는 단계;Obtaining a correction correction coefficient by substituting the water residual amount obtained as described above into a correlation between the water residual amount and the correction coefficient;
상기와 같이 구한 수정 보정계수와 가장 최근에 동일 소재의 제조에 대하여 학습함으로써 구해진 보정계수를 이용하여 가중평균법에 의해 최종 보정계수를 구하는 단계; 및Obtaining a final correction coefficient by a weighted average method using the correction coefficient obtained as described above and the correction coefficient obtained by learning about the manufacture of the same material most recently; And
상기와 같이 구한 최종보정계수를 다음에 제조할 동일한 소재조건을 갖는 열연강판 냉각과정에 적용하여, 냉각종료온도와 목표냉각온도와의 차이가 오차범위내에 오도록 하는 보정 주수량을 구하여 열연강판을 냉각하는 단계를 포함하여 구성되는 열연강판의 냉각방법에 관한 것이다.The final correction coefficient obtained as described above is applied to the cooling process of the hot rolled steel sheet having the same material conditions to be manufactured next, and the hot rolled steel sheet is cooled by obtaining the correction main quantity so that the difference between the cooling end temperature and the target cooling temperature is within the error range. It relates to a method for cooling a hot rolled steel sheet comprising a step.
이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
본 발명은 상기한 바와 같이, 목표냉각종료온도를 설정하는 단계; 현재 제조하고자 하는 열연강판의 소재조건을 이용하여 상기 목표냉각종료온도를 얻을 수 있는 주수량을 결정하는 단계; 상기와 같이 결정된 주수량을 주수하여 열연강판을 냉각시키는 단계; 상기 열연강판의 냉각시 열연강판의 냉각종료온도를 측정하는 단계; 상기와 같이 측정된 열연강판의 냉각종료온도와 목표냉각종료온도와의 차이를 구하는 단계; 상기 측정 냉각종료온도와 목표냉각종료온도와의 차이가 목표 오차 범위내에 오도록 하는 보정계수를 시행오차법등에 의한 학습을 통해 구하는 단계; 및 상기와 같이 구한 보정계수를 다음에 생산할 동일한 소재조건을 갖는 열연강판 냉각과정에 적용하여, 냉각종료온도와 목표냉각온도와의 차이가 목표오차범위내에 오도록 하는 보정 주수량을 구하여 열연강판을 냉각하는 단계를 포함하여 구성되는 열연강판의 냉각방법에 적용된다.As described above, the present invention comprises the steps of setting a target cooling end temperature; Determining the amount of water to obtain the target cooling end temperature by using the material conditions of the hot-rolled steel sheet to be manufactured; Pouring hot water determined as described above to cool the hot rolled steel sheet; Measuring a cooling end temperature of the hot rolled steel sheet when the hot rolled steel sheet is cooled; Obtaining a difference between the cooling end temperature and the target cooling end temperature of the hot-rolled steel sheet measured as described above; Obtaining a correction coefficient such that a difference between the measured cooling end temperature and a target cooling end temperature is within a target error range through learning by a trial and error method; And applying the correction coefficient obtained as described above to the process of cooling the hot rolled steel sheet having the same material conditions to be produced next, and obtaining the correction main quantity so that the difference between the cooling end temperature and the target cooling temperature is within the target error range. Applied to the method of cooling a hot rolled steel sheet comprising a step.
본 발명에 따라 열연강판을 냉각하기 위해서는 상기 열연강판의 냉각시 주위공기중의 수분잔량(단위 질량당의 공기가 갖을 수 있는 최대 수분량(무게)에서 현재 단위질량당의 공기가 갖고 있는 수분량(무게)을 뺀 값)과 상기 보정계수와의 상관관계식을 구해야 한다.In order to cool the hot-rolled steel sheet according to the present invention, the amount of water (weight) currently contained in the air per unit mass is determined by the amount of water remaining in the ambient air (the maximum amount of water (weight) the air per unit mass can have) during cooling of the hot-rolled steel sheet. Subtracted value) and the correction coefficient.
본 발명자들은 수분잔량과 상기 보정계수와의 상관관계식을 구하기 위하여 많은 실험을 행하고, 그 결과를 도 3, 도 4 및 도 5에 나타내었다.The present inventors have conducted a number of experiments to obtain a correlation between the moisture residual amount and the correction coefficient, and the results are shown in FIGS. 3, 4 and 5.
도 3은 실험실에서 동일유량, 냉각개시조건을 갖는 동일 강종, 두께의 강판을 냉각할 때 주변공기온도만 10℃와 40`℃로 다른 두 조건에서 얻어진 실험결과를 나타낸 것이다.Figure 3 shows the experimental results obtained under the other two conditions at the ambient air temperature of only 10 ℃ and 40` ℃ when cooling the steel sheet of the same steel grade, thickness with the same flow rate, cooling start conditions in the laboratory.
도 3에 나타난 바와 같이, 냉각능력의 변화가 주위 공기조건에 따라 달라짐을 알수 있다.As shown in Figure 3, it can be seen that the change in the cooling capacity depends on the ambient air conditions.
그런데, 이 두 조건에서 보면 공기온도에 따라 포화가능수증기량에 차이가 생겨 10℃인 경우에서 보다 빠르게 수증기가 나타나는 것을 알 수 있다. 도 4는 주위온도와 습도를 측정하고 이 주위온도에서 포화될 수 있는 수증기량을 구하여 여분의 공간, 즉 단위 질량의 공기당 포화수증기량에서 현재 수분함량을 뺀 값(수분잔량)을 구한 다음, 수분 잔량과 도 2와 같이 구한 보정계수의 변화를 비교한 것이다.However, in these two conditions it can be seen that the difference in the amount of saturable water vapor depending on the air temperature appears to be faster than in the case of 10 ℃. Fig. 4 measures the ambient temperature and humidity, calculates the amount of water vapor that can be saturated at the ambient temperature, and calculates the excess space, that is, the amount of saturated water vapor per unit mass of the air minus the current water content (the remaining water content), and then the remaining water amount. 2 and compare the change of the correction coefficient obtained as shown in FIG.
도 4에 나타난 바와 같이, 수분잔량이 냉각능 보정계수의 변화를 표현할 수 있는 잣대(기준)이 될 수 있음을 알 수 있다.As shown in Figure 4, it can be seen that the moisture balance can be a standard (reference) that can represent the change in the cooling capacity correction coefficient.
따라서, 열연강판의 냉각설비 근처에 온도와 습도를 동시에 측정할 수 있는 센서를 부착하여 이 센서에 의해 측정되는 정보(수분잔량)와 냉각능력 보정계수와의 관계식을 구할 수 있다.Therefore, by attaching a sensor that can measure temperature and humidity at the same time near the cooling facility of the hot-rolled steel sheet, it is possible to obtain a relationship between the information measured by the sensor (remaining water content) and the cooling capacity correction coefficient.
상기한 상관관계는 강종, 두께, 생산속도에 따라 바뀔 수 있으나, 어느 경우나 수분잔량(포화가능 수증기량)과 냉각능 보정계수 사이에는 도 5에 나타난 바와 같이 선형에 가까운 관계식이 얻어진다.The correlation may vary depending on the steel grade, thickness, and production speed, but in either case, a linear relationship is obtained between the residual water content (saturable water vapor) and the cooling capacity correction coefficient as shown in FIG. 5.
다음에는, 다음 열연강판의 냉각시 주위온도와 습도를 측정하고, 이 주위온도에서 포화될 수 있는 수증기량을 구하여 주위 공기중의 수분잔량을 구한다.Next, measure the ambient temperature and humidity when cooling the next hot-rolled steel sheet, find the amount of water vapor that can be saturated at this ambient temperature, and determine the residual moisture in the ambient air.
상기 주위 공기중위 수분잔량은 열연강판의 냉각설비 근처에 온도와 습도를 동시에 측정할 수 있는 센서를 부착하여 이 센서에 의해 측정되는 정보에 의해 구해질 수 있다.The residual amount of moisture in the surrounding air can be obtained by the information measured by the sensor by attaching a sensor that can simultaneously measure the temperature and humidity near the cooling facility of the hot-rolled steel sheet.
다음에는, 상기와 같이 구한 수분잔량을 상기 수분잔량과 상기 보정계수와의 상관관계식에 대입하여 수정 보정계수를 구한다.Next, a correction correction coefficient is obtained by substituting the water residual amount obtained as described above into a correlation between the water residual amount and the correction coefficient.
다음에, 상기와 같이 구한 수정 보정계수와 가장 최근에 동일 소재의 제조에 대하여 학습함으로써 구해진 보정계수를 이용하여 가중평균법에 의해 최종 보정계수를 구한다.Next, the final correction coefficient is obtained by the weighted average method using the correction correction coefficient obtained as described above and the correction coefficient obtained by learning about the manufacture of the same material most recently.
바람직한 최종보정계수는 다음과 같다.Preferred final correction factors are as follows.
최종보정계수 = 수정보정계수 × (0.2 ∼0.4) + 보정계수×(0.6 ∼0.8)Final correction factor = numerical correction factor × (0.2 ~ 0.4) + correction factor × (0.6 ~ 0.8)
상기 수정보정계수와 보정계수에 곱해지는 값들의 합은 항상 1.0이다.The sum of the values multiplied by the numerical constant and the correction coefficient is always 1.0.
상기와 같이 가중평균하는 이유는 보정계수는 여러 가지 이론적으로 규명되지 않은 오차를 반영하는 것이므로 주위공기가 갖는 수분에 의한 효과는 이 오차중의 일부로 약 20-40%정도로 여겨진다.The reason for the weighted average as described above is that the correction coefficient reflects various theoretically unknown errors, so the effect of moisture in the ambient air is considered to be about 20-40% as part of this error.
다음에, 상기와 같이 구한 최종보정계수를 다음에 제조할 동일한 소재조건을 갖는 열연강판 냉각과정에 적용하여, 냉각종료온도와 목표냉각온도와의 차이가 오차범위내에 오도록 하는 보정 주수량을 구하여 열연강판을 냉각하므로써, 온도 제어를 보다 정확히 할 수 있게 된다.Next, the final correction coefficient obtained as described above is applied to the cooling process of the hot rolled steel sheet having the same material conditions to be manufactured next, and the hot water is obtained by calculating the corrected amount of water so that the difference between the cooling end temperature and the target cooling temperature is within the error range. By cooling the steel sheet, temperature control can be more accurately performed.
이하, 실시예를 통하여 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
도 6은 종래의 열연강판의 냉각방법에 적용되기 위한 냉각능 보정계수(f1)과 본 발명에 따라 수정된 냉각능 보정계수(f(modified))를 생산후에 학습된 냉각능 보정계수(f2)와 비교한 예를 나타낸다.6 is a cooling capacity correction coefficient f2 learned after production of a cooling capacity correction coefficient f1 and a cooling capacity correction coefficient f (modified) modified according to the present invention for application to a conventional method for cooling a hot rolled steel sheet. The example compared with is shown.
도 6에 나타난 바와 같이, 종래 냉각능 보정계수(f1)에 비해 수정된 냉각능 보정계수가 분산이 줄고 기울기가 1에 가깝고, 절편값이 크게 작아져서 학습된 냉각능 보정계수와 잘 일치하게 됨을 알 수 있다. 즉 온도제어가 더 정확하게 될 수 있음을 알 수 있다.As shown in FIG. 6, compared with the conventional cooling power correction coefficient f1, the modified cooling power correction coefficient decreases in variance, the slope is close to 1, and the intercept value is greatly reduced, so that the cooling power correction coefficient is well matched with the learned cooling power correction coefficient. Able to know. It can be seen that the temperature control can be more accurate.
또한, 몇가지 강종에 대해 본 발명의 적용전과 후의 온도제어 적중율을 변화를 조사하고, 그 결과를 도 7에 나타내었다.In addition, the change of the temperature control hit ratio before and after the application of the present invention was investigated for several steel grades, and the results are shown in FIG. 7.
도 7에 나타난 바와 같이, 본 발명을 적용한 경우 적중율이 모든 소재 강종, 두께에 대해 우수하게 나타남을 알 수 있다.As shown in Figure 7, it can be seen that the hit ratio is excellent for all material grades, thicknesses when the present invention is applied.
상술한 바와 같이, 본 발명에 따라 열연강판을 냉각하는 경우 온도제어를 보다 정확히 할 수 있는 효과가 있다.As described above, when cooling the hot-rolled steel sheet according to the present invention, there is an effect that the temperature control can be more accurately.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-1999-0040868A KR100431834B1 (en) | 1999-09-22 | 1999-09-22 | A Method for Cooling Hot-Rolled Steel Sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-1999-0040868A KR100431834B1 (en) | 1999-09-22 | 1999-09-22 | A Method for Cooling Hot-Rolled Steel Sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20010028564A KR20010028564A (en) | 2001-04-06 |
| KR100431834B1 true KR100431834B1 (en) | 2004-05-20 |
Family
ID=19612597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR10-1999-0040868A KR100431834B1 (en) | 1999-09-22 | 1999-09-22 | A Method for Cooling Hot-Rolled Steel Sheet |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR100431834B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100832974B1 (en) * | 2001-12-26 | 2008-05-27 | 주식회사 포스코 | In-line feed backward cooling control method of hot strip |
| KR100843842B1 (en) * | 2006-12-22 | 2008-07-03 | 주식회사 포스코 | Temperature controlling method and apparatus in hot strip mill |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56136215A (en) * | 1980-03-29 | 1981-10-24 | Sumitomo Metal Ind Ltd | Method and apparatus for feedback control of water cooling for steel material in rolling line |
| JPH0732024A (en) * | 1993-06-28 | 1995-02-03 | Mitsubishi Electric Corp | Method for controlling temperature of hot rolled steel products |
| JPH0942843A (en) * | 1995-07-27 | 1997-02-14 | Kawasaki Steel Corp | Method and device for drying metal strip |
-
1999
- 1999-09-22 KR KR10-1999-0040868A patent/KR100431834B1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56136215A (en) * | 1980-03-29 | 1981-10-24 | Sumitomo Metal Ind Ltd | Method and apparatus for feedback control of water cooling for steel material in rolling line |
| JPH0732024A (en) * | 1993-06-28 | 1995-02-03 | Mitsubishi Electric Corp | Method for controlling temperature of hot rolled steel products |
| JPH0942843A (en) * | 1995-07-27 | 1997-02-14 | Kawasaki Steel Corp | Method and device for drying metal strip |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010028564A (en) | 2001-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111482465A (en) | Plate shape control method and device for plate and strip | |
| WO2008078908A1 (en) | Temperature controlling method and apparatus in hot strip mill | |
| Belan et al. | The role of air humidity in variations in near-surface ozone concentration | |
| KR100431834B1 (en) | A Method for Cooling Hot-Rolled Steel Sheet | |
| CN107008758A (en) | Cold-strip steel high accuracy plate shape surface roughness On-Line Control Method and system | |
| CN103736747A (en) | Sensing contact area percentage based strip steel edge flatness detection value compensation method | |
| US6161405A (en) | Apparatus for controlling a rolling mill based on a strip crown of a strip and the same | |
| RU2177847C1 (en) | Rolling process control method | |
| CN102323397A (en) | Measurement method of concrete crack risk evaluation index | |
| BR112021026886A2 (en) | Method for controlling a cooling device in a rolling mill | |
| CN103406369A (en) | Method for improving strip steel head roll force precision by utilizing temperature function | |
| KR20040044325A (en) | Method for Controlling Thickness of Front Portion of Hot-Rolled Steel Sheet | |
| KR100957707B1 (en) | Method for controlling width of slab in continuous rolling mill | |
| CN113137729A (en) | Fuzzy control method of constant-temperature and constant-humidity air conditioner based on relative humidity and moisture content | |
| Hertl et al. | An autonomous approach to road temperature prediction | |
| CN108760797B (en) | Method for processing expansion curve of metal material | |
| RU2421713C1 (en) | Method of measuring gas humidity | |
| JPH09276915A (en) | Dynamic setup method in continuous rolling mill | |
| KR20040056704A (en) | A method for predicting hot deformation resistance of STS 430 ferritic stainless steel | |
| JP2004255436A (en) | Method for controlling sheet crown in tandem hot rolling mill | |
| CN114112152B (en) | Overhead line stress variable temperature compensation method, device and storage medium | |
| JPH0857512A (en) | Manufacture of tapered steel sheet | |
| KR20030053575A (en) | cooling control method of high carbon hot-rolled strip taken phase transformation into account | |
| SU1161205A1 (en) | Apparatus for automatic controlling of speeded cooling of rolled stock | |
| KR101105900B1 (en) | Method of roll force prediction in hot plate rolling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant | ||
| FPAY | Annual fee payment |
Payment date: 20130503 Year of fee payment: 10 |
|
| FPAY | Annual fee payment |
Payment date: 20140508 Year of fee payment: 11 |
|
| FPAY | Annual fee payment |
Payment date: 20150506 Year of fee payment: 12 |
|
| FPAY | Annual fee payment |
Payment date: 20160509 Year of fee payment: 13 |
|
| FPAY | Annual fee payment |
Payment date: 20170427 Year of fee payment: 14 |
|
| FPAY | Annual fee payment |
Payment date: 20180508 Year of fee payment: 15 |
|
| LAPS | Lapse due to unpaid annual fee |