TW201940706A - Method of setting annealing time for steel coil - Google Patents
Method of setting annealing time for steel coil Download PDFInfo
- Publication number
- TW201940706A TW201940706A TW107109701A TW107109701A TW201940706A TW 201940706 A TW201940706 A TW 201940706A TW 107109701 A TW107109701 A TW 107109701A TW 107109701 A TW107109701 A TW 107109701A TW 201940706 A TW201940706 A TW 201940706A
- Authority
- TW
- Taiwan
- Prior art keywords
- steel coil
- temperature
- annealing
- setting
- cold spot
- Prior art date
Links
Abstract
Description
本發明是關於一種鋼捲之退火週期的設定方法，特別是關於一種根據退火爐的爐溫來決定鋼捲之退火週期的設定方法。 The invention relates to a method for setting the annealing period of steel coils, and more particularly to a method for determining the annealing period of steel coils according to the furnace temperature of an annealing furnace.
封盒退火(Batch Annealing)製程是冷軋鋼捲的退火方式之一，惟封盒退火製程易導致鋼捲內部各點的溫度分布不均勻，因此，控制鋼捲在退火過程中的冷點(溫度最低的點)及熱點(溫度最高的點)的溫度變化係決定退火後鋼捲品質的重要關鍵。 The batch annealing process is one of the annealing methods for cold-rolled steel coils. However, the box annealing process tends to cause uneven temperature distribution at various points inside the steel coil. Therefore, the cold point (temperature) of the steel coil during the annealing process is controlled. The temperature change at the lowest point) and hot spot (the highest temperature point) is an important factor that determines the quality of the coil after annealing.
習知封盒退火製程的退火週期係依照經驗進行設定，對於不同的生產條件缺乏彈性，且無法針對不同退火爐的特性進行調整。一般而言，習知封盒退火製程的退火週期係根據鋼捲重量以階梯式加熱的方式進行均溫時間的調整，然而，此種設定方式常有堆疊重量較輕的鋼捲卻進行較長時間退火的情形，因而經常造成能源的浪費。 The annealing cycle of the conventional box sealing annealing process is set according to experience, lacks flexibility for different production conditions, and cannot be adjusted for the characteristics of different annealing furnaces. Generally speaking, the annealing cycle of the conventional box sealing annealing process is adjusted in a stepwise manner according to the weight of the steel coil. However, this setting method often has a lighter stack of steel coils, but it takes a longer time. In the case of time annealing, energy is often wasted.
有鑑於此，亟須提供一種鋼捲之退火週期的設定方法，以針對不同退火爐的特性及鋼捲的重量，設定合理 的退火週期。 In view of this, it is urgent to provide a method for setting the annealing cycle of steel coils in order to set a reasonable setting for the characteristics of different annealing furnaces and the weight of steel coils. Annealing cycle.
本發明之一態樣是提供一種鋼捲之退火週期的設定方法，其係藉由計算鋼捲之複數個位置的溫度，以獲得鋼捲的冷點溫度及熱當量面積。接著，藉由調整退火週期預設值，使冷點溫度大於冷點溫度設定值，且熱當量面積大於熱當量面積門檻值時，設定此退火週期預設值為此鋼捲的退火週期。 One aspect of the present invention is to provide a method for setting the annealing cycle of a steel coil, which calculates the temperature of a plurality of positions of the steel coil to obtain the cold spot temperature and the thermal equivalent area of the steel coil. Then, by adjusting the preset value of the annealing cycle so that the cold spot temperature is greater than the cold spot temperature set value and the thermal equivalent area is greater than the thermal equivalent area threshold, the preset annealing cycle value is set to the annealing cycle of the steel coil.
根據本發明之一態樣，提供一種鋼捲之退火週期的設定方法。此方法包含提供鋼捲之尺寸及熱傳導係數，以及提供退火製程之退火週期預設值及爐溫。接著，設定時間步階，並利用演算法計算鋼捲之複數個位置的複數個溫度。 According to an aspect of the present invention, a method for setting an annealing cycle of a steel coil is provided. This method includes providing the size and thermal conductivity of the steel coil, and providing the preset value of the annealing cycle and the furnace temperature of the annealing process. Next, a time step is set, and an algorithm is used to calculate a plurality of temperatures at a plurality of positions of the steel coil.
然後，比較鋼捲之冷點溫度與冷點溫度設定值，其中鋼捲之冷點溫度係上述溫度中的最小值。當冷點溫度係小於冷點溫度設定值時，延長上述退火週期預設值；當冷點溫度係大於或等於冷點溫度設定值時，計算鋼捲的熱當量面積。熱當量面積為冷點溫度與退火週期預設值的積分面積。 Then, compare the cold spot temperature of the steel coil with the set value of the cold spot temperature, where the cold spot temperature of the steel coil is the minimum of the above temperatures. When the cold spot temperature is less than the cold spot temperature set value, the preset value of the annealing cycle is extended; when the cold spot temperature is greater than or equal to the cold spot temperature set value, the thermal equivalent area of the steel coil is calculated. The thermal equivalent area is the integrated area of the cold spot temperature and the preset value of the annealing cycle.
接著，比較上述熱當量面積與熱當量面積門檻值。當熱當量面積係小於熱當量面積門檻值時，延長退火週期預設值；當熱當量面積係大於或等於熱當量面積門檻值時，進行退火週期設定步驟，以將上述退火週期預設值設定 為退火週期。 Next, the thermal equivalent area and the thermal equivalent area threshold are compared. When the thermal equivalent area is smaller than the thermal equivalent area threshold, the preset value of the annealing cycle is extended; when the thermal equivalent area is greater than or equal to the thermal equivalent area threshold, the annealing cycle setting step is performed to set the foregoing annealing cycle preset value Is the annealing cycle.
根據本發明之一實施例，上述設定時間步階之操作更包含進行判斷步驟，其中判斷步驟係利用有限差分法計算演算法，以判斷演算法是否收斂。當時間步階使演算法發散時，調整時間步階，直至演算法收斂；當時間步階使演算法收斂時，利用此時間步階計算鋼捲之溫度。 According to an embodiment of the present invention, the operation of setting the time step further includes a judgment step, wherein the judgment step uses a finite difference method to calculate an algorithm to determine whether the algorithm converges. When the time step diverges the algorithm, adjust the time step until the algorithm converges. When the time step converges the algorithm, use this time step to calculate the temperature of the steel coil.
根據本發明之一實施例，上述演算法為鋼捲之熱傳導方程式。 According to an embodiment of the present invention, the algorithm is a heat conduction equation of a steel coil.
根據本發明之一實施例，上述鋼捲之位置係以二維座標所定義。 According to an embodiment of the present invention, the position of the steel coil is defined by two-dimensional coordinates.
根據本發明之一實施例，上述冷點溫度設定值及熱當量面積門檻值係由標準鋼捲所定義，其中標準鋼捲具有預設機械性質。 According to an embodiment of the present invention, the cold spot temperature setting value and the thermal equivalent area threshold are defined by a standard steel coil, wherein the standard steel coil has preset mechanical properties.
根據本發明之一實施例，上述退火製程包含預熱步驟與加熱步驟，且加熱步驟係將爐溫加熱至預設溫度。 According to an embodiment of the present invention, the annealing process includes a pre-heating step and a heating step, and the heating step is heating the furnace temperature to a preset temperature.
根據本發明之一實施例，在上述加熱步驟之後，退火製程更包含持溫步驟，其中持溫步驟之爐溫為上述之預設溫度。 According to an embodiment of the present invention, after the heating step, the annealing process further includes a temperature holding step, wherein the furnace temperature of the temperature holding step is the above-mentioned preset temperature.
應用本發明之鋼捲之退火週期的設定方法，其係藉由演算法計算出鋼捲不同位置的溫度，並根據所獲得之冷點溫度與熱當量面積，決定鋼捲的退火週期，藉此設定之退火週期可節省製程時間，並避免多餘的能源浪費。 By applying the method for setting the annealing cycle of the steel coil of the present invention, the temperature of different positions of the steel coil is calculated by an algorithm, and the annealing period of the steel coil is determined according to the obtained cold spot temperature and the heat equivalent area, thereby The set annealing cycle can save process time and avoid waste of extra energy.
100‧‧‧方法 100‧‧‧ Method
110‧‧‧提供鋼捲的尺寸及熱傳導係數之步驟 110‧‧‧Procedures for providing steel coil size and thermal conductivity
120‧‧‧提供退火製程之退火週期預設值及退火爐的爐溫之步驟 120‧‧‧Provides the annealing cycle preset value and the furnace temperature of the annealing process
130‧‧‧設定時間步階，並利用演算法計算鋼捲的溫度之步驟 130‧‧‧ Set the time step and use the algorithm to calculate the temperature of the coil
140‧‧‧冷點溫度是否大於或等於冷點溫度設定值之步驟 140‧‧‧Steps of whether the cold spot temperature is greater than or equal to the set value of the cold spot temperature
145‧‧‧延長退火週期預設值之步驟 145‧‧‧Steps to extend the preset value of annealing cycle
150‧‧‧熱當量面積是否大於或等於熱當量面積門檻值之步驟 150‧‧‧The step of whether the thermal equivalent area is greater than or equal to the thermal equivalent area threshold
160‧‧‧進行退火週期設定步驟 160‧‧‧ Perform the annealing cycle setting step
201/203/205/207/209‧‧‧量測點 201/203/205/207 / 209‧‧‧ measuring points
501‧‧‧點 501‧‧‧points
為讓本發明之上述和其他目的、特徵、優點與實施例能更明顯易懂，所附圖式之詳細說明如下：[圖1]係繪示根據本發明一實施例之鋼捲之退火週期的設定方法的流程圖。 In order to make the above and other objects, features, advantages, and embodiments of the present invention more comprehensible, the detailed description of the drawings is as follows: [FIG. 1] is a diagram illustrating an annealing cycle of a steel coil according to an embodiment of the present invention Flow chart of the setting method.
[圖2A]係繪示根據本發明一實施例之鋼捲進行退火實驗之配置示意圖。 [Fig. 2A] is a schematic diagram showing the configuration of annealing test of a steel coil according to an embodiment of the present invention.
[圖2B]係繪示根據本發明一實施例之圖2A中不同位置所量測的溫度與退火時間的關係。 [FIG. 2B] FIG. 2B illustrates the relationship between the temperature and the annealing time measured at different positions in FIG. 2A according to an embodiment of the present invention.
[圖3]係繪示根據實施例1及比較例1之不同重量的鋼捲與均溫步驟時間的關係圖。 FIG. 3 is a graph showing the relationship between steel coils of different weights and the time of the temperature equalization step according to Example 1 and Comparative Example 1. FIG.
[圖4]係繪示根據實施例2及比較例1之不同重量的鋼捲與均溫步驟時間的關係圖。 FIG. 4 is a graph showing the relationship between steel coils of different weights and the time of the temperature equalization step according to Example 2 and Comparative Example 1. FIG.
[圖5]係繪示根據實施例3及比較例1之不同重量的鋼捲與均溫步驟時間的關係圖。 FIG. 5 is a graph showing the relationship between steel coils of different weights and the time of the temperature equalization step according to Example 3 and Comparative Example 1. FIG.
承上所述，本發明提供一種鋼捲之退火週期的設定方法，其係藉由計算鋼捲之複數個位置的溫度，以獲得鋼捲的冷點溫度及熱當量面積。接著，藉由調整退火週期預設值，使冷點溫度大於冷點溫度設定值，且熱當量面積大於熱當量面積門檻值時，設定此退火週期預設值為此鋼捲的退火週期。 As mentioned above, the present invention provides a method for setting the annealing cycle of a steel coil, which calculates the temperature of a plurality of positions of the steel coil to obtain the cold spot temperature and the thermal equivalent area of the steel coil. Then, by adjusting the preset value of the annealing cycle so that the cold spot temperature is greater than the cold spot temperature set value and the thermal equivalent area is greater than the thermal equivalent area threshold, the preset annealing cycle value is set to the annealing cycle of the steel coil.
請參閱圖1，其係繪示根據本發明一實施例之鋼捲之退火週期的設定方法100的流程圖。首先，進行步驟 110，提供鋼捲的尺寸及熱傳導係數。在一實施例中，鋼捲的尺寸包含鋼捲的內半徑、外半徑及寬度。在另一實施例中，利用鋼捲的尺寸及重量可獲得鋼捲的密度。在一實施例中，利用鋼捲的熱傳導係數及使用之保護氣體的熱傳導係數可獲得鋼捲徑向等效熱傳導係數。 Please refer to FIG. 1, which is a flowchart illustrating a method 100 for setting an annealing cycle of a steel coil according to an embodiment of the present invention. First, proceed to the steps 110, provide the size and thermal conductivity of the steel coil. In an embodiment, the size of the steel coil includes an inner radius, an outer radius, and a width of the steel coil. In another embodiment, the size and weight of the steel coil can be used to obtain the density of the steel coil. In one embodiment, the thermal conductivity of the steel coil and the thermal conductivity of the shielding gas used can be used to obtain the equivalent thermal conductivity of the steel coil in the radial direction.
接著，方法100進行至步驟120，提供退火製程之退火週期預設值及退火爐的爐溫。在一實施例中，退火製程包含預熱步驟及加熱步驟，其中加熱步驟係將退火爐之爐溫加熱至預設溫度。在此實施例中，在加熱步驟之後，可選擇性地進行持溫步驟，其係將爐溫保持在前述預設溫度下一段時間(換言之，退火週期減去預熱步驟與加熱步驟所需時間後的時間即持溫步驟的進行時間)。 Next, the method 100 proceeds to step 120 to provide a preset value of the annealing cycle of the annealing process and the furnace temperature of the annealing furnace. In one embodiment, the annealing process includes a preheating step and a heating step, wherein the heating step is to heat the furnace temperature of the annealing furnace to a preset temperature. In this embodiment, after the heating step, a temperature holding step may be selectively performed, which is to maintain the furnace temperature at the aforementioned preset temperature for a period of time (in other words, the annealing cycle minus the time required for the preheating step and the heating step). The subsequent time is the duration of the temperature holding step).
然後，方法100繼續進行步驟130，設定時間步階，並利用演算法計算鋼捲的溫度。在一實施例中，演算法為鋼捲的熱傳導方程式，演算法可例如式(1)所示。式(1)的演算法係僅考慮鋼捲內徑向與軸向的傳熱，且假設鋼捲及保護氣體的初始溫度皆為環境溫度。在此實施例中，將鋼捲的位置以二維座標(即鋼捲之徑向和軸向所構成之二維座標)定義。在一實施例中，此演算法係利用有限差分法計算。 Then, the method 100 proceeds to step 130, sets a time step, and uses an algorithm to calculate the temperature of the steel coil. In one embodiment, the algorithm is a heat conduction equation of a steel coil, and the algorithm may be, for example, shown in equation (1). The algorithm of formula (1) only considers the radial and axial heat transfer in the coil, and assumes that the initial temperature of the coil and the protective gas are the ambient temperature. In this embodiment, the position of the steel coil is defined by a two-dimensional coordinate (that is, a two-dimensional coordinate formed by the radial and axial directions of the steel coil). In one embodiment, the algorithm is calculated using a finite difference method.
在式(1)中，T為溫度；r和z分別為徑向和軸向座標；λs為鋼捲的熱傳導係數；λr為鋼捲的徑向等效熱傳導係數；ρ為鋼捲的密度；Cp為鋼捲的熱容量；t為時間步階。在一實施例中，鋼捲的徑向等效熱傳導係數可利用下式(2)獲得。 In formula (1), T is the temperature; r and z are the radial and axial coordinates, respectively; λ s is the thermal conductivity of the steel coil; λ r is the radial equivalent thermal conductivity of the steel coil; ρ is the Density; C p is the heat capacity of the steel coil; t is the time step. In one embodiment, the radial equivalent thermal conductivity of the steel coil can be obtained using the following formula (2).
在式(2)中，c為縫隙厚度；d為鋼捲厚度；λg為保護氣體的熱傳導係數。 In formula (2), c is the thickness of the gap; d is the thickness of the steel coil; λ g is the thermal conductivity of the shielding gas.
在此實施例中，上述熱傳導方程式之式(1)的初始條件係以下式(3)進行設定，且邊界條件符合下式(4)至式(7)。 In this embodiment, the initial conditions of the above formula (1) of the heat conduction equation are set by the following formula (3), and the boundary conditions conform to the following formulas (4) to (7).
在式(3)中，T(r,z)為鋼捲中不同位置之溫度；T0為鋼捲的初始溫度；Ri及Ro分別為鋼捲的內半徑及外半徑；W1為鋼捲的寬度。 In the formula (3), T (r, z) is the temperature at different locations of the coil; T 0 is the initial temperature of the coil; R i and R o are the inner radius and an outer radius of the coil; W 1 is The width of the steel coil.
在式(4)至式(7)中，h0、hi、hb及ht分別為鋼捲之外表面、內表面、下表面及上表面的對流熱交換係數、、及分別為鋼捲之外表面、內表面、下表面及上表面的輻射熱流密度；Tg為爐溫。 In equations (4) to (7), h 0 , h i , h b and h t are the convective heat exchange coefficients of the outer surface, inner surface, lower surface and upper surface of the steel coil, respectively. , , and The radiant heat flux densities of the outer surface, the inner surface, the lower surface and the upper surface of the steel coil, respectively; T g is the furnace temperature.
在一實施例中，步驟130可選擇性地包含時間步階的判斷步驟。在一具體例中，此判斷步驟係利用有限差分法計算上述演算法，以判斷時間步階是否收斂。在此實施例中，當步驟130提供的時間步階使演算法發散時，須調整時間步階，再進行計算，直至所選擇的時間步階使演算法收 斂時，利用此時間步階，並根據此演算法以計算鋼捲中每一個位置的溫度。 In an embodiment, step 130 may optionally include a step of judging a time step. In a specific example, the determination step is to calculate the above algorithm using a finite difference method to determine whether the time step converges. In this embodiment, when the time step provided in step 130 diverges the algorithm, the time step must be adjusted and then calculated until the selected time step causes the algorithm to close. When converging, use this time step and use this algorithm to calculate the temperature at each location in the coil.
接著，進行步驟140，比較鋼捲之冷點溫度與冷點溫度設定值，判斷冷點溫度是否大於或等於冷點溫度設定值。本發明說明書中所述之冷點溫度係定義為上述鋼捲之所有位置的溫度中的最小值。在一實施例中，冷點溫度設定值係由標準鋼捲所決定，其中標準鋼捲係指具有符合所要求之機械性質(即預設機械性質)的鋼捲。在此實施例中，定義標準鋼捲的冷點溫度為冷點溫度設定值。 Next, step 140 is performed to compare the cold spot temperature and the cold spot temperature set value of the steel coil, and determine whether the cold spot temperature is greater than or equal to the cold spot temperature set value. The cold spot temperature described in the description of the present invention is defined as the minimum value of the temperature at all positions of the steel coil. In an embodiment, the set value of the cold spot temperature is determined by a standard steel coil, wherein the standard steel coil refers to a steel coil having a required mechanical property (that is, a preset mechanical property). In this embodiment, the cold spot temperature of a standard steel coil is defined as a cold spot temperature set value.
當冷點溫度小於冷點溫度設定值時，如圖1所示，沿著「否」之箭頭指示，進行步驟145，延長退火週期預設值。接著，重新進行步驟120及步驟130，以重新計算鋼捲各位置的溫度後，再進行步驟140，直至所獲得之冷點溫度大於或等於冷點溫度設定值。當冷點溫度大於或等於冷點溫度設定值時，計算熱當量面積。本發明說明書中所述之「熱當量面積」係指冷點溫度與退火時間之關係式在退火週期預設值下的積分面積。 When the cold spot temperature is less than the set value of the cold spot temperature, as shown in FIG. 1, along the arrow of “No”, step 145 is performed to extend the preset value of the annealing cycle. Then, step 120 and step 130 are performed again to recalculate the temperature of each position of the steel coil, and then step 140 is performed until the obtained cold spot temperature is greater than or equal to the cold spot temperature set value. When the cold spot temperature is greater than or equal to the set value of the cold spot temperature, the heat equivalent area is calculated. The "thermal equivalent area" described in the specification of the present invention refers to the integral area of the relationship between the cold spot temperature and the annealing time under the preset value of the annealing cycle.
然後，方法100繼續進行步驟150，比較熱當量面積與熱當量面積門檻值，判斷熱當量面積是否大於或等於熱當量面積門檻值。在一實施例中，熱當量面積門檻值係標準鋼捲於其退火週期中，將其冷點溫度與退火時間之關係式所計算出的熱當量面積定義為熱當量面積門檻值。 Then, the method 100 proceeds to step 150, comparing the thermal equivalent area with the thermal equivalent area threshold, and determining whether the thermal equivalent area is greater than or equal to the thermal equivalent area threshold. In one embodiment, the thermal equivalent area threshold value is the thermal equivalent area threshold value calculated by the relationship between the cold spot temperature and the annealing time of a standard steel coil during its annealing cycle.
當熱當量面積小於熱當量面積門檻值時，沿著圖1所示之「否」的箭頭，進行步驟145，延長退火週期預 設值。然後，重新進行步驟120至步驟140，以計算鋼捲各位置的溫度，並獲得冷點溫度，再重新進行步驟150，直至所獲得之熱當量面積大於或等於熱當量面積門檻值。然後，進行步驟160，進行退火週期設定步驟，以將同時滿足(1)鋼捲之冷點溫度大於或等於冷點溫度設定值及(2)熱當量面積大於或等於熱當量面積門檻值等條件的退火週期預設值設定為鋼捲的退火週期，而可節省製程時間，並避免多餘的能源浪費。 When the thermal equivalent area is less than the thermal equivalent area threshold, follow the “No” arrow shown in FIG. 1 to proceed to step 145 to extend the annealing cycle time. Set value. Then, step 120 to step 140 are performed again to calculate the temperature of each position of the steel coil and obtain the cold spot temperature, and then step 150 is performed again until the obtained thermal equivalent area is greater than or equal to the thermal equivalent area threshold. Then, step 160 is performed, and an annealing cycle setting step is performed to satisfy conditions such as (1) the cold spot temperature of the coil is greater than or equal to the cold spot temperature set value and (2) the thermal equivalent area is greater than or equal to the thermal equivalent area threshold. The preset value of the annealing cycle is set to the annealing cycle of the steel coil, which can save process time and avoid waste of extra energy.
以下利用數個實施例以說明本發明之應用，然其並非用以限定本發明，本發明技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾。 The following uses several embodiments to illustrate the application of the present invention, but it is not intended to limit the present invention. Those with ordinary knowledge in the technical field of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Retouch.
首先，將鋼捲以圖2A的配置方式置於退火爐內，進行退火實驗，並分別以熱電偶量測點201、203、205、207及209的溫度，其中點201為鋼捲中心之內壁處，點203為靠近鋼捲頂表面之外壁處，點205為鋼捲中心之核心處，點207為鋼捲中心之外壁處，點209之溫度為退火爐的爐溫。各點所量測的溫度與退火時間的關係係如圖2B所示，由圖2B可看出點207與點209的溫度曲線相似，即點207的溫度接近於爐溫，故點207為鋼捲之熱點(溫度最高的點)，而點201、203及205的溫度曲線相似，其中以點205的溫度上升速率最慢，故點205為鋼捲之冷點(溫度最低的點)。 First, the steel coil is placed in the annealing furnace in the configuration shown in FIG. 2A, and an annealing experiment is performed, and the temperatures of points 201, 203, 205, 207, and 209 are measured by thermocouples, where point 201 is within the center of the coil At the wall, point 203 is the outer wall near the top surface of the coil, point 205 is the core of the coil center, point 207 is the outer wall of the coil center, and the temperature of point 209 is the furnace temperature of the annealing furnace. The relationship between the measured temperature and annealing time at each point is shown in Figure 2B. From Figure 2B, it can be seen that the temperature curve of point 207 and point 209 are similar, that is, the temperature of point 207 is close to the furnace temperature, so point 207 is steel. The hot spot of the coil (the point with the highest temperature), and the temperature curves of the points 201, 203, and 205 are similar. The temperature rise rate of the point 205 is the slowest. Therefore, the point 205 is the cold point of the steel coil (the point with the lowest temperature).
上述各點溫度量測的實驗重複進行三次，並將 點201至207的量測溫度與利用本發明上述演算法所計算出的溫度比較，如以下表1所示。表1結果顯示演算法所計算的各點溫度值與實際量測溫度值的誤差皆不超過1.30%。換言之，本發明所使用之演算法所計算出鋼捲之不同位置的溫度具有相當高的準確性。 The experiment of temperature measurement at the above points was repeated three times, and The measured temperatures at points 201 to 207 are compared with the temperatures calculated using the algorithm of the present invention, as shown in Table 1 below. The results in Table 1 show that the error between the temperature value calculated by the algorithm and the actual measured temperature value does not exceed 1.30%. In other words, the temperature calculated at different positions of the coil by the algorithm used in the present invention has a relatively high accuracy.
實施例1係針對僅有寬度差異之不同重量的鋼捲進行退火製程，並設定相同時間的預熱步驟及加熱步驟。接著，根據上述退火週期的設定方法獲得不同寬度(不同重量)之鋼捲的退火週期，其中冷點溫度設定值為610℃，而熱當量面積門檻值為70000。由於退火製程包含預熱步驟、加熱步驟及均溫步驟的時間，故在固定預熱步驟時間及加熱步驟時間均相同的條件下，各不同重量的鋼捲之差異僅為均溫步驟的時間。實施例1的預熱步驟時間及加熱步驟時間分別為1小時及5小時。 Embodiment 1 is an annealing process for steel coils of different weights with only a difference in width, and a preheating step and a heating step are set at the same time. Next, according to the method for setting the annealing cycle described above, annealing cycles of steel coils of different widths (different weights) are obtained, in which the set value of the cold spot temperature is 610 ° C and the threshold of the thermal equivalent area is 70,000. Since the annealing process includes the time of the preheating step, the heating step, and the temperature equalizing step, under the condition that the time of the fixed preheating step and the heating step are the same, the difference between the steel coils of different weights is only the time of the temperature equalizing step. The time of the preheating step and the heating step of Example 1 were 1 hour and 5 hours, respectively.
請參閱圖3，其係繪示根據實施例1及比較例1之不同重量的鋼捲與均溫步驟時間的關係圖。比較例1係採用習知依照經驗法則設定封盒退火製程之退火週期的方法 來進行退火製程。由圖3的結果可看出，實施例1所獲得之均溫步驟時間係隨鋼捲重量增加而上升，即均溫步驟時間與鋼捲重量為正相關，而比較例1則有較多重量較輕的鋼捲卻有較長的均溫步驟時間。相較之下，比較例1的方式易造成較多的能源浪費。 Please refer to FIG. 3, which is a graph showing the relationship between the steel coils of different weights and the time of the temperature equalization step according to Example 1 and Comparative Example 1. Comparative Example 1 is a method of setting the annealing cycle of the box annealing process in accordance with the conventional rule of thumb. To perform the annealing process. It can be seen from the results in FIG. 3 that the time for the temperature equalization step obtained in Example 1 increases with the weight of the steel coil, that is, the time for the temperature equalization step is positively correlated with the weight of the steel coil, while the weight of the comparative example 1 has more weight Lighter coils have longer time to equalize the temperature. In comparison, the method of Comparative Example 1 tends to cause more energy waste.
實施例2與實施例1類似，皆是固定預熱步驟及加熱步驟的時間，分別為1小時及5小時，但實施例2之鋼捲的重量差異包含寬度及厚度的差異。請參閱圖4，其係繪示根據實施例2及比較例1之不同重量的鋼捲與均溫步驟時間的關係圖。由圖4可看出，實施例2之三個不同重量的鋼捲之均溫步驟時間並未與重量成正相關，其係可能由於鋼捲之厚度差異導致熱傳導係數的不同或是鋼捲在退火爐中的配置位置不同。 Example 2 is similar to Example 1 in that the time for the fixed preheating step and the heating step are 1 hour and 5 hours, respectively, but the weight difference of the steel coil in Example 2 includes the difference in width and thickness. Please refer to FIG. 4, which is a graph showing the relationship between the steel coils of different weights and the time of the equalizing step according to Example 2 and Comparative Example 1. It can be seen from FIG. 4 that the average temperature step time of the three coils of different weights in Example 2 is not positively related to the weight. It may be due to the difference in the thickness of the coils that results in the difference in the thermal conductivity coefficient or the coils are retreating The placement in the stove is different.
實施例3的預熱步驟時間及加熱步驟時間係使用實際應用之不同退火爐的爐溫，並針對不同重量的鋼捲來推算其退火週期。請參閱圖5，其係繪示根據實施例3及比較例1之不同重量的鋼捲與均溫步驟時間的關係圖。由圖5中可看出，點501的均熱步驟時間遠小於比較例1對相同重量之鋼捲所使用的設定值，其主要係由於此退火爐的爐溫係經過較長時間的加熱步驟才到達所設定之冷點溫度設定值，以致於後續僅須經過較短時間的均熱步驟後，即可使鋼捲的冷點溫度大於或等於冷點溫度設定值，且熱當量面積大於或等於熱當量面積門檻值。 The preheating step time and the heating step time of the embodiment 3 are based on the furnace temperatures of different annealing furnaces used in practice, and the annealing cycles are estimated for different weight steel coils. Please refer to FIG. 5, which is a graph showing the relationship between the steel coils with different weights and the time of the temperature equalization step according to Example 3 and Comparative Example 1. It can be seen from FIG. 5 that the time of the soaking step at point 501 is much shorter than the set value used for the same weight steel coil in Comparative Example 1, which is mainly due to the longer heating step of the furnace temperature of this annealing furnace Only reached the set cold spot temperature set value, so that after only a short time soaking step, the cold spot temperature of the steel coil can be greater than or equal to the cold spot temperature set value, and the heat equivalent area is greater than or It is equal to the thermal equivalent area threshold.
由於實施例3係針對不同的退火爐，而退火爐的特性不同將導致退火爐達到設定溫度所須之預熱步驟時間及加熱步驟時間的差異，故對鋼捲的溫度造成差異，進而影響均熱步驟所需的時間。 Since Example 3 is directed to different annealing furnaces, and the different characteristics of the annealing furnaces will lead to the difference between the preheating step time and the heating step time required for the annealing furnace to reach the set temperature, it will cause a difference in the temperature of the steel coil, and then affect the average temperature. The time required for the thermal step.
根據上述實施例，本發明可藉由演算法計算出鋼捲不同位置的溫度，並根據所獲得之冷點溫度與熱當量面積，決定鋼捲的退火週期。由於本發明提供之方法可依據不同退火爐的爐溫以及鋼捲的特性來設定退火製程之退火週期，而可標準化退火週期的設定，並滿足各種退火爐與鋼捲之需求，進而避免習知仰賴經驗法則所導致之缺陷，故本發明之退火週期的設定方法可節省製程時間，並避免多餘的能源浪費。 According to the above embodiment, the present invention can calculate the temperature of the coil at different positions through an algorithm, and determine the annealing period of the coil according to the obtained cold spot temperature and the thermal equivalent area. Because the method provided by the present invention can set the annealing cycle of the annealing process according to the furnace temperature of different annealing furnaces and the characteristics of the steel coil, the setting of the annealing cycle can be standardized, and the needs of various annealing furnaces and steel coils can be met, thereby avoiding the conventional knowledge. Depending on the defects caused by the rule of thumb, the method for setting the annealing cycle of the present invention can save process time and avoid waste of extra energy.
雖然本發明已以數個實施例揭露如上，然其並非用以限定本發明，在本發明所屬技術領域中任何具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。 Although the present invention has been disclosed as above with several embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field to which the present invention pertains can make various modifications without departing from the spirit and scope of the present invention. Changes and retouching, so the protection scope of the present invention shall be determined by the scope of the appended patent application.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW107109701A TWI655292B (en) | 2018-03-21 | 2018-03-21 | Method of setting annealing time for steel coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW107109701A TWI655292B (en) | 2018-03-21 | 2018-03-21 | Method of setting annealing time for steel coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TWI655292B TWI655292B (en) | 2019-04-01 |
| TW201940706A true TW201940706A (en) | 2019-10-16 |
Family
ID=66995837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW107109701A TWI655292B (en) | 2018-03-21 | 2018-03-21 | Method of setting annealing time for steel coil |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TWI655292B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392119B (en) * | 2011-10-28 | 2013-07-17 | 重庆赛迪工业炉有限公司 | Online comprehensive control method for hot-galvanized continuous annealing furnace |
| CN103468922B (en) * | 2012-06-06 | 2015-01-21 | 上海梅山钢铁股份有限公司 | Control method for preventing thermal buckling of annealing furnace strip steel |
| CN105648178B (en) * | 2016-03-07 | 2018-02-13 | 首钢京唐钢铁联合有限责任公司 | A kind of cold rolled continuous annealing process dual phase steel oxidation tint control method |
-
2018
- 2018-03-21 TW TW107109701A patent/TWI655292B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| TWI655292B (en) | 2019-04-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TW200917402A (en) | Heat processing apparatus, method of automatically tuning control constants, and storage medium | |
| JP5101243B2 (en) | Substrate processing apparatus, substrate processing apparatus control method, and program | |
| CN1672107A (en) | Method, apparatus and program of thermal analysis, heat controller and heating furnace using the method | |
| US7598150B2 (en) | Compensation techniques for substrate heating processes | |
| JP5120337B2 (en) | Silicon single crystal manufacturing method, silicon single crystal temperature estimation method | |
| CN108760073A (en) | A kind of device and test method for testing furnace temperature of heating furnace uniformity | |
| JP5640647B2 (en) | Method and apparatus for measuring surface temperature of steel in furnace | |
| TWI655292B (en) | Method of setting annealing time for steel coil | |
| US20210215426A1 (en) | Monitoring a sintering process | |
| US11806788B2 (en) | Sintering furnace | |
| TW201938851A (en) | Method of estimating silicon melt convection pattern, method of estimating oxygen concentration in single-crystal silicon, method of manufacturing single-crystal silicon, and device of pulling single-crystal silicon | |
| CN104328273A (en) | Control method for temperature of thermal treatment heating furnace | |
| CN105734263B (en) | A kind of method of follow-up steel billet temperature and furnace temp in prediction heating furnace | |
| WO2014038313A1 (en) | Temperature control sequence determination device, molding device, program, recording medium, and temperature control sequence determination method | |
| JP3267371B2 (en) | Wafer heating method and apparatus | |
| JP6830855B2 (en) | Manufacturing method of synthetic quartz glass | |
| JP2004244721A (en) | Method for estimating heat transfer coefficient and method for controlling cooling in water-cooling process for steel plate | |
| Fang et al. | Batch annealing model for cold rolled coils and its application | |
| JP6451331B2 (en) | Identification method of heat transfer coefficient | |
| KR101676203B1 (en) | Heat treatment method of stainless steel slab | |
| TWI680186B (en) | Calculation method of annealed coil temperature | |
| CN110349722B (en) | Heat treatment method of alloy resistor | |
| CN111900099B (en) | Temperature monitoring method of annealing equipment | |
| CN206094940U (en) | A temperature control system for resistance furnace even heating | |
| TWI695072B (en) | Method for manufacturing partially annealed aluminum alloy by using critical annealing temperature |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Annulment or lapse of patent due to non-payment of fees |