1225100 玖、發明說明： 【發明所屬之技術領域】 本發明係關於一種在聯機而對於熱軋後之淬火或急速冷 卻之鋼材來進行熱處理之鋼材之製造方法，特別是使用感 應加熱裝置之鋼材之製造方法及其製造設備。 【先前技術】 板厚8 m m以上之鋼板係為了達到高強度化或高韌性化， 因此，大多是藉由熱軋後之淬火或加速冷卻而進行急冷接 著接受回火處理。 近年來，淬火或加速冷卻係成為藉由聯機而進行，但是， 回火處理係仍然在聯機，藉由氣體燃燒爐而進行，因此， 需要長時間，顯著地妨礙鋼板之生產效率。因此，提議用 以提高回火處理之生產效率之數個方法。 例如在日本專利特開平9 一 2 5 6 0 5 3號公報，為了生產效 率之提升，因此，提議下工夫於回火處理時之溫度圖案而 提高生產效率之技術。在該技術，鋼板係連續地搬送至設 定進入側在高溫、出口側在低溫之氣體燃燒爐内而進行熱 處理。具體地說，爐進入側之溫度係設定在更加高於成為 目的之熱處理溫度2 0 0 °C以上，朝向爐子之出口側而使得 爐溫呈階段式地降低，爐子出口側前之溫度係設定在由成 為目的之熱處理溫度開始之± 2 0 °C以内。但是，在藉由氣 體燃燒所造成之加熱方式，熱傳達係藉由輻射或對流所造 成，因此，不可能進行急速加熱，無法充分地提高生產效 率。 312/發明說明書(補件)/92-09/92121473 1225100 此外，在日本專利特開平4 一 3 5 8 0 2 2號公報或特開平6 —2 5 4 6 1 5號公報，作為生產效率高之熱處理方法，係提議 將加熱裝置設置在軋制線上而對於鋼板來進行熱處理之聯 機熱處理方法。在前者，揭示將軋輥機、加速冷卻裝置和 加熱裝置配置在軋制線上而進行急速加熱回火熱處理來製 造高強度高韌性之鋼板之技術，在後者，揭示將軋親機、 矯正機、加速冷卻裝置和保溫裝置配置在軋制線上並且藉 由保溫裝置而除去由於軋制或加速冷卻所產生之鋼板中之 殘留應力之技術。但是，即使是這些方法，也會有所謂花 費相當之熱處理時間或無法均勻地對於鋼板進行熱處理之 問題產生。 在曰本專利特開昭4 8 — 2 5 2 3 9號公報，揭示在軋制線上 呈串聯地配置複數台螺線管型感應加熱裝置而對於鋼板進 行熱處理之技術。在企圖藉由1台感應加熱裝置而加熱鋼 板至目標溫度為止時，感應電流係集中及流動在鋼板之表 面附近，恐怕會使得表面溫度過熱而超過居里點或A c 1變 態點。因此，不容易在1台感應加熱裝置，控制鋼板之表 面溫度在一定溫度以下，同時，加熱至板厚中心部為止而 成為目標溫度，因此，在該技術，呈串聯地配置2個以上 之感應加熱裝置，使得鋼板通過該裝置内，進行加熱，使 得至板厚中心部為止，來成為目標溫度而不超過表面溫度 之上限溫度。但是，因此，必須降低鋼板之搬送速度，無 法得到充分高之生產效率。特別是在板厚變厚之鋼板之情 況，在一直到鋼板内部為止之熱傳達，花費相當之時間， 6 312/發明說明書(補件)/92-09/92121473 1225100 因此，必須大幅度地降低搬送速度，使得生產效率顯著地 變差。 【發明内容】 本發明之目的係提供一種可以使用配置在熱軋線上之 感應加熱裝置並且以高生產效率且均勾地對於鋼材來進行 熱處理之鋼材之製造方法及其製造設備。 前述目的係藉由以下方法而達成。 1) 一種鋼材之製造方法，係具有：在熱軋後、於熱軋線 上來使得淬火或急速冷卻之鋼材通過設置在熱軋線上之複 數台感應加熱裝置3次以上而進行熱處理之步驟。在此， 所謂通過1次係表示鋼材沿著某一方向而僅通過複數台感 應加熱裝置1次。因此，如果鋼材往返於裝置1次的話， 則通過次數係成為2次。 2 ) —種鋼材之製造方法，係具有：在熱軋後、於熱軋線 上來使得淬火或急速冷卻之鋼材通過設置在熱軋線上之複 數台感應加熱裝置至少1次而進行熱處理之步驟；並且， 使得通過於感應加熱裝置之通過次數_，成為使得鋼材之表 面溫度和中心溫度在最短時間收納在既定溫度範圍之次 數。 3 ) —種鋼材之製造方法，係具有：在熱軋後、於熱軋線 上來使得淬火或急速冷卻之鋼材通過設置在熱軋線上之複 數台感應加熱裝置至少1次而進行熱處理之步驟；並且， 使得通過於感應加熱裝置之通過次數，成為使得鋼材之表 面溫度和中心溫度在目標時間内而收納在既定溫度範圍之 7 312/發明說明書(補件)/92-09/92121473 1225100 次數。 4) 一種鋼材之製造方法，係具有：在熱軋後、於熱軋線 上來使得淬火或急速冷卻之鋼材通過設置在熱軋線上之複 數台感應加熱裝置至少1次而進行熱處理之步驟；並且， 對於鋼材進行熱處理，以便於使得根據鋼材尺寸和必要升 溫量、對於感應加熱裝置之通過次數及感應加熱裝置之加 熱能力所算出之鋼材之表面溫度不超過既定之上限溫度而 鋼材内部既定位置之溫度到達至目標溫度為止之熱處理時 間，收納在目標時間以内。 5 ) —種鋼材之製造方法，係具有：在熱軋後、於熱軋線 上來使得淬火或急速冷卻之鋼材通過設置在熱軋線上之複 數台感應加熱裝置至少1次而進行熱處理之步驟；並且， 對於鋼材進行熱處理，以便於使得根據鋼材尺寸和必要升 溫量、對於感應加熱裝置之通過次數及感應加熱裝置之加 熱能力所算出之鋼材之表面溫度不超過既定之上限溫度而 鋼材内部既定位置之溫度到達至目標溫度為止之熱處理時 間，變得最短。 6 ) —種鋼材之製造方法，係具有：在熱軋後、於熱軋線 上來使得淬火或急速冷卻之鋼材通過設置在熱軋線上之2 〜5台感應加熱裝置3次以上而進行熱處理之步驟。 這些方法係可以藉由以下鋼材之製造設備而實現：在熱 軋線上，具備：熱軋輥機、淬火或加速冷卻裝置、複數台 感應加熱裝置和演算感應加熱裝置之熱處理圖案之演算裝 置；並且，前述演算裝置係具有：計算熱軋後之淬火或加 8 312/發明說明書(補件)/92-09/92121473 1225100 速冷卻之鋼材到達至感應加熱裝置之預定時刻之機構；以 及，由鋼材尺寸和必要升溫量以及鋼材之下一個熱處理之 鋼材到達至感應加熱裝置之預定時刻而決定下一個熱處理 之鋼材不待機於熱軋線上之熱處理圖案之機構。 【實施方式】 在圖1，顯示成為本發明之鋼材之製造設備之某一例。 藉由熱軋輥機1所軋制之鋼材2係接受由於水冷裝置3 所造成之淬火處理，藉由端正機4而橋正歪斜’藉由複數 台感應加熱裝置5來進行熱處理。作為感應加熱裝置5係 有橫向型和螺線管型，但是，在本發明，由控制鋼材2表 面附近之發熱量之目的來看的話，因此，最好是使用螺線 管型感應加熱裝置5。此外，矯正機4係不需要一定配置 在水冷裝置3之後面，可以配置在水冷裝置3之上游側或 感應加熱裝置5之下游側等，但是，為了防止鋼材2之均 勻加熱或者是和感應加熱裝置5間之衝突，因此，最好是 配置在感應加熱裝置5之進入側。 在圖2，顯示圖1所示之感應加熱裝置之詳細。 該感應加熱裝置係由複數台感應加熱裝置5、具備在最 初感應加熱裝置5之入口而檢測鋼材2溫度之溫度檢測器 6、用以搬送鋼材2之搬送滾筒7、由搬送滾筒7之旋轉而 檢測鋼材搬送速度之速度檢測器8、計算各個感應加熱裝 置5之供應電力之控制裝置9、根據來自控制裝置9之輸 出而控制供應至各個感應加熱裝置5之電力之電力供應裝 置1 0以及具備在檢測加熱後之鋼材2溫度之最後感應加熱 9 312/發明說明書(補件)/92-09/92121473 1225100 裝置5出口之溫度檢測器1 1所構成。 以下，說明成為使用該感應加熱裝置之本發明之鋼材之 製造方法之實施形態。 (第1實施形態） 在此，進行往復著鋼材而通過感應加熱裝置3次以上來 進行熱處理之所謂反向熱處理。可以藉由增加通過次數而 增加外觀上之感應加熱裝置之台數，減少每1台之升溫 量，因此，比起通過次數為1次之情況，還可以更加提高 搬送速度。此外，在所有次數，皆不進行加熱，例如也可 以在3次而進行反向熱處理之情況，也可僅使第2次通過 感應加熱裝置，而僅在第1次和第3次來進行加熱。在該 情況，可以提高第2次之搬送速度而縮短熱處理時間，因 此，能夠提高生產效率。 (第2實施形態） 在此，以在最短時間而將其表面溫度和中心溫度來收納 在既定溫度範圍内之通過次數，對於鋼材進行熱處理。 (第3實施形態） 在此，使用鋼材尺寸和必要升溫量而求出通過次數、鋼 材搬送速度及感應加熱裝置之電力設定間之關係，使得通 過於感應加熱裝置之通過次數，成為使得由該關係所決定 之熱處理時間變得最短之次數，來對於鋼材進行熱處理。 也就是說，以通過次數和搬送速度及供應至各個感應加 熱裝置之電力，作為變數，求出鋼材之表面和中心之溫度， 以這些溫度成為收納在既定溫度範圍内時之最短熱處理時 10 312/發明說明書(補件)/92-09/92121473 1225100 間之通過次數，來對於鋼材進行熱處理。 在決定通過次數和各次之鋼材搬送速度及各個感應加 熱裝置之電力設定之順序，正如以下所示：考慮（1 )在每 一個鋼材來決定搬送速度、通過次數及電力設定之方法； 以及（2 )藉由鋼材尺寸而預先決定搬送速度、通過次數及 電力設定之方法之兩者。 (1 )在每一個鋼材來決定搬送速度、通過次數及感應加熱 裝置之電力設定之方法 ① 得到鋼材尺寸及必要升溫量。 由控制生產之計算機，來得到下一個進行熱處理之鋼材 厚度、幅寬和目標溫度、上限溫度等之熱處理條件。 ② 求出在通過次數為1次之情況之搬送速度和電力設 定。 假設以1次來進行熱處理，使得變數成為鋼材搬送速度 及各個感應加熱裝置之電力，使得限制條件成為上限溫度 和目標溫度，目的函數係解開由熱處理時間和消耗電力量 所構成之最適當化問題。在該情況，也可以使用線形計畫 法、非線形計晝法等之最適當化方法而解開，並且，也能 夠藉由適當地改變各個變數，求出熱處理時間變得最短、 消耗電力變小之搬送速度及電力之組合而解開。 ③ 求出在通過次數為3次之情況之搬送速度和電力設 定。 假設以3次來進行熱處理，使得變數成為各次鋼材搬送 速度及各個感應加熱裝置之電力，使得限制條件成為上限 11 312/發明說明書(補件)/92-09/92121473 1225100 溫度和目標溫度，目的函數係解開由熱處理時間和消 力量所構成之最適當化問題。在該情況，也可以使用 計晝法、非線形計晝法等之最適當化方法而解開，並 也能夠藉由適當地改變各個變數，求出熱處理時間變 短、消耗電力變小之搬送速度及電力之組合而解開。 ④ 求出在通過次數為複數次之情況之搬送速度和電 設定。 相同於前述③，增加5次、7次之通過次數，求出-之鋼材搬送速度及電力之組合。藉由鋼材尺寸及升温· 預先決定最大通過次數，進行到達至該次數為止之④ 理。 ⑤ 決定通過次數。 選擇熱處理時間變得最短之通過次數，使用此時之 搬送速度及電力，來對於鋼材進行熱處理。 (2)藉由鋼材尺寸而預先決定通過次數、鋼材搬送速 感應加熱裝置之電力設定之方法 在事前，於鋼種及熱處理圖案之每一個，作成.對應 1所示之鋼材尺寸之通過次數和搬送速度表。 作為熱處理條件，係就例如下面敘述之2個熱處理 件、在此為熱處理前之初期溫度、目標溫度、成為這 值之升溫量之各個條件而作成表格。表1係根據a)之 理條件所作成之例子。1225100 Description of the invention: [Technical field to which the invention belongs] The present invention relates to a method for manufacturing a steel material that is heat-treated on-line and quenched or rapidly cooled after hot rolling, especially a steel material using an induction heating device Manufacturing method and manufacturing equipment thereof. [Prior art] In order to achieve high strength or high toughness, steel plates with a plate thickness of 8 mm or more are usually quenched by quenching or accelerated cooling after hot rolling and then subjected to tempering. In recent years, the quenching or accelerated cooling system has been performed on-line, but the tempering treatment system is still on-line and performed by a gas burner. Therefore, it takes a long time to significantly hinder the production efficiency of the steel sheet. Therefore, several methods have been proposed to improve the productivity of the tempering process. For example, in Japanese Patent Laid-Open No. 9-2656053, in order to improve the production efficiency, a technique for improving the production efficiency by applying a temperature pattern during tempering is proposed. In this technique, the steel sheet is continuously conveyed into a gas combustion furnace with a set inlet side at a high temperature and an outlet side at a low temperature for thermal treatment. Specifically, the temperature on the furnace inlet side is set to be more than 200 ° C higher than the intended heat treatment temperature, and the furnace temperature is gradually lowered toward the furnace outlet side. The temperature in front of the furnace outlet side is set. Within ± 20 ° C from the target heat treatment temperature. However, in the heating method by gas combustion, heat transfer is caused by radiation or convection. Therefore, rapid heating is impossible and the production efficiency cannot be sufficiently improved. 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 In addition, in Japanese Patent Laid-Open No. 4-1 3 5 8 0 2 2 or Japanese Patent Laid-open No. 6-2 5 4 6 1 5, it has high production efficiency. The heat treatment method is an on-line heat treatment method in which a heating device is installed on a rolling line and a steel plate is heat-treated. In the former, the technology of manufacturing high-strength and high-toughness steel plates by arranging roll mills, accelerated cooling devices, and heating devices on the rolling line and performing rapid heating and tempering heat treatment is disclosed. A technology in which a cooling device and a thermal insulation device are arranged on a rolling line and a residual stress in a steel plate caused by rolling or accelerated cooling is removed by the thermal insulation device. However, even with these methods, there are problems that it takes a considerable amount of heat treatment time or that the steel sheet cannot be heat treated uniformly. Japanese Patent Application Laid-Open No. Sho 4 8-2 5 2 3 9 discloses a technology for heat-treating a steel sheet by arranging a plurality of solenoid-type induction heating devices in series on a rolling line. When attempting to heat the steel plate to a target temperature by an induction heating device, the induced current is concentrated and flows near the surface of the steel plate, which may cause the surface temperature to overheat and exceed the Curie point or A c 1 abnormal point. Therefore, it is not easy to control the surface temperature of the steel plate below a certain temperature in one induction heating device, and at the same time, it is heated to the center of the plate thickness to become the target temperature. Therefore, in this technology, two or more induction sensors are arranged in series. The heating device heats the steel sheet through the inside of the device so as to reach the target temperature without exceeding the upper limit temperature of the surface temperature up to the center of the plate thickness. However, therefore, it is necessary to reduce the conveying speed of the steel sheet, and a sufficiently high production efficiency cannot be obtained. In particular, in the case of a steel plate having a thickened plate thickness, it takes a considerable time for heat to be transmitted to the inside of the steel plate. 6 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 The conveying speed significantly deteriorates the production efficiency. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a steel material that can use an induction heating device arranged on a hot rolling line and heat-treat the steel material with high productivity and uniformity, and a manufacturing apparatus therefor. The foregoing object is achieved by the following method. 1) A method for manufacturing a steel material, comprising the steps of subjecting a quenched or rapidly cooled steel material to a hot rolling line after hot rolling through a plurality of induction heating devices installed on the hot rolling line for three or more times to perform heat treatment. Here, the “passing once” means that the steel material passes through a plurality of induction heating devices only once in a certain direction. Therefore, if the steel material travels to and from the device once, the number of passes becomes two. 2) —A method for manufacturing steel materials, comprising the steps of: after hot rolling, quenching or rapidly cooling steel materials through a plurality of induction heating devices installed on the hot rolling lines to perform heat treatment at least once; In addition, the number of passes _ passed through the induction heating device becomes the number of times that the surface temperature and the core temperature of the steel material are stored in a predetermined temperature range in the shortest time. 3) —A method for manufacturing a steel material, comprising: after hot rolling, on the hot rolling line to quench or quench the steel material by a plurality of induction heating devices installed on the hot rolling line at least once to perform heat treatment; In addition, the number of times of passing through the induction heating device is such that the surface temperature and center temperature of the steel material are stored in the predetermined temperature range within 7 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 times within the target time. 4) A method for manufacturing a steel material, comprising: after hot rolling, a step of subjecting a quenched or rapidly cooled steel material to a heat rolling line by at least one induction heating device installed on the hot rolling line to perform heat treatment; and Heat treatment of the steel, so that the surface temperature of the steel calculated according to the size of the steel and the necessary heating amount, the number of passes of the induction heating device and the heating capacity of the induction heating device does not exceed a predetermined upper limit temperature and The heat treatment time until the temperature reaches the target temperature is stored within the target time. 5) —A method for manufacturing a steel material, comprising: after hot rolling, a step of subjecting a quenched or rapidly cooled steel material to a heat rolling line through a plurality of induction heating devices installed on the hot rolling line to perform heat treatment at least once; In addition, heat treatment is performed on the steel material so that the surface temperature of the steel material calculated based on the size of the steel material and the necessary heating amount, the number of passes for the induction heating device and the heating capacity of the induction heating device does not exceed a predetermined upper limit temperature and a predetermined position inside the steel material. The heat treatment time until the temperature reaches the target temperature becomes the shortest. 6) —A method for manufacturing steel materials, which includes: after hot rolling, quenched or rapidly cooled steel materials on a hot rolling line are heat treated by 2 to 5 induction heating devices installed on the hot rolling line more than 3 times step. These methods can be realized by the following steel manufacturing equipment: on a hot rolling line, a hot rolling mill, a quenching or accelerated cooling device, a plurality of induction heating devices, and a calculation device for calculating a heat treatment pattern of the induction heating device; and, The aforementioned calculation device has a mechanism for calculating the quenched or added 8 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 steel that has been rapidly cooled to reach the predetermined time of the induction heating device after hot rolling; and A mechanism for determining the heat treatment pattern of the steel material that does not wait on the hot-rolled line, and the necessary heating temperature and the time when the next heat-treated steel material reaches the predetermined time of the induction heating device. [Embodiment] Fig. 1 shows an example of a manufacturing facility for a steel material according to the present invention. The steel material 2 rolled by the hot roll mill 1 is subjected to the quenching treatment caused by the water cooling device 3, and the bridge is skewed by the straightening machine 4. The heat treatment is performed by a plurality of induction heating devices 5. The induction heating device 5 includes a horizontal type and a solenoid type. However, in the present invention, for the purpose of controlling the amount of heat generated near the surface of the steel material 2, it is preferable to use a solenoid type induction heating device 5 . In addition, the straightening machine 4 series does not necessarily need to be arranged behind the water cooling device 3, and may be arranged upstream of the water cooling device 3 or downstream of the induction heating device 5, etc., but in order to prevent uniform heating or induction heating of the steel 2 The conflict between the devices 5 is therefore preferably arranged on the entrance side of the induction heating device 5. FIG. 2 shows the details of the induction heating device shown in FIG. 1. The induction heating device is composed of a plurality of induction heating devices 5, a temperature detector 6 for detecting the temperature of the steel 2 at the entrance of the initial induction heating device 5, a conveying drum 7 for conveying the steel 2, and rotation of the conveying drum 7. A speed detector 8 for detecting the speed of conveying steel, a control device 9 for calculating the power supplied to each induction heating device 5, a power supply device 10 for controlling the power supplied to each induction heating device 5 based on the output from the control device 9, After detecting the temperature of the heated steel 2 at the end, induction heating 9 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 The temperature detector 11 at the outlet of the device 5 is composed. Hereinafter, an embodiment of a method for producing a steel material according to the present invention using the induction heating device will be described. (First Embodiment) Here, a so-called reverse heat treatment in which a steel material is reciprocated and heat-treated by an induction heating device three or more times is performed. By increasing the number of passes, the number of induction heating devices in appearance can be increased, and the heating amount per unit can be reduced. Therefore, the conveying speed can be increased more than when the number of passes is one. In addition, the heating is not performed at all times. For example, the reverse heat treatment may be performed three times, or the induction heating device may be passed only for the second time, and the heating may be performed only for the first and third times. . In this case, since the second transfer speed can be increased and the heat treatment time can be shortened, the production efficiency can be improved. (Second Embodiment) Here, the steel material is heat-treated at the number of passes in which the surface temperature and the center temperature are stored in a predetermined temperature range in the shortest time. (Third Embodiment) Here, the relationship between the number of passes, the steel conveying speed, and the power setting of the induction heating device is determined by using the size of the steel material and the necessary heating amount, so that the number of passes through the induction heating device is determined by the The heat treatment time determined by the relationship becomes the shortest number of times to heat-treat the steel. In other words, the surface and center temperature of the steel is obtained by using the number of passes, the conveying speed, and the power supplied to each induction heating device as variables, and these temperatures become the shortest heat treatment time when stored in a predetermined temperature range. 10 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 Passes to heat-treat the steel. The order of determining the number of passes and the speed of each steel transfer and the power setting of each induction heating device is as follows: Consider (1) a method for determining the transfer speed, number of passes, and power setting for each steel; and ( 2) Both the conveying speed, the number of passes, and the power setting method are determined in advance by the size of the steel. (1) Method for determining the conveying speed, the number of passes, and the power setting of the induction heating device for each steel material. ① Obtain the size of the steel material and the necessary temperature rise. The computer that controls the production will obtain the next heat treatment conditions such as the thickness, width, target temperature, and upper limit temperature of the steel material to be heat treated. ② Determine the transfer speed and power setting when the number of passes is one. It is assumed that the heat treatment is performed once, so that the variables become the conveying speed of the steel and the power of each induction heating device, so that the limiting conditions are the upper limit temperature and the target temperature. The objective function is to unlock the most appropriate composition of heat treatment time and power consumption. problem. In this case, it can be solved by using the most appropriate methods such as linear planning method and non-linear day counting method, and by appropriately changing each variable, the heat treatment time can be minimized and the power consumption can be reduced. The combination of the transfer speed and the power can be unlocked. ③ Determine the transfer speed and power settings when the number of passes is three. Assume that the heat treatment is performed three times, so that the variables become the steel conveying speed and the power of each induction heating device, so that the limiting conditions become the upper limit 11 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 temperature and target temperature, The objective function is to solve the optimization problem composed of heat treatment time and energy dissipation. In this case, it can be solved by using the most appropriate method such as the day counting method and the non-linear day counting method, and by appropriately changing each variable, it is possible to obtain a transfer speed with a shorter heat treatment time and a lower power consumption. And power combination. ④ Calculate the transfer speed and electrical settings when the number of passes is multiple. Same as the above-mentioned ③, increase the number of passes 5 times and 7 times to find the combination of steel conveying speed and power. The maximum number of passes is determined in advance by the size of the steel material and the temperature rise. ⑤ Determine the number of passes. Select the number of passes for which the heat treatment time becomes the shortest, and use the transfer speed and power at this time to heat treat the steel. (2) The method of determining the number of passes in advance based on the size of the steel, and the power setting of the steel conveying speed induction heating device are prepared in advance for each of the steel type and heat treatment pattern. Corresponds to the number of passes and transfer of the steel size shown in 1. Speedometer. As the heat treatment conditions, for example, two tables for heat treatment described below, and the conditions for the initial temperature before the heat treatment, the target temperature, and the temperature increase amount to this value are tabulated. Table 1 is an example based on the rationale of a).
a )初期溫度4 0 0 °C 、目標溫度6 0 0 °C、升溫量2 0 0 °Ca) Initial temperature of 4 0 ° C, target temperature of 60 0 ° C, temperature increase amount of 2 0 0 ° C
b )初期溫度1 0 0 °C 、目標溫度6 0 0 °C 、升溫量5 0 0 °C 312/發明說明書(補件)/92-09/92121473 耗電 線形 且， 得最 力 ‘次 量而 之處 鋼材 度及 於表 條 些差 熱處 12 1225100 此外，表1係藉由以下①〜⑤之順序所作成。 ① 決定成為熱處理對象之鋼材尺寸及必要升溫量。 ② 求出在通過次數為1次之情況之鋼材搬送速度和各個 感應加熱裝置之電力設定。 假設以1次來進行熱處理，使得變數成為鋼材搬送速度 及各個感應加熱裝置之電力，使得限制條件成為上限溫度 和目標溫度，目的函數係解開由熱處理時間和消耗電力量 所構成之最適當化問題。在該情況，也可以使用線形計畫 法、非線形計晝法等之最適當化方法而解開，並且，也能 夠藉由適當地改變各個變數，求出熱處理時間變得最短、 消耗電力變小之搬送速度及電力之組合而解開。 ③ 求出在通過次數為3次之情況之搬送速度和各個感應 加熱裝置之電力設定。 假設以3次來進行熱處理，使得變數成為各個感應加熱 裝置之電力，使得限制條件成為上限溫度和目標溫度，目 的函數係解開由消耗電力量所構成之最適當化問題。在該 情況，也可以使用線形計畫法、非線形計晝法等之最適當 化方法而解開，並且，也能夠藉由適當地改變各個變數， 求出消耗電力變得最小之電力組合而解開。 ④ 求出在通過次數為複數次之情況之搬送速度和各個 感應加熱裝置之電力設定。 相同於前述③，增加5次、7次之通過次數，求出各次 之鋼材搬送速度及各個感應加熱裝置之電力之組合。藉由 鋼材尺寸及升溫量而預先決定最大通過次數，進行到達至 13 312/發明說明書(補件)/92-09/92121473 1225100 該次數為止之④之處理。 ⑤決定通過次數。 決定熱處理時間變得最短之通過次數和鋼材搬送速 度。此外，在表1並無記載，但是，也決定此時之電力設 定0b) Initial temperature of 100 ° C, target temperature of 60 ° C, heating temperature of 50 ° C 312 / Invention Specification (Supplement) / 92-09 / 92121473 The power consumption is shaped and the most effective amount Where is the degree of steel and some differential heat on the surface 12 1225100 In addition, Table 1 is made in the following order ① ~ ⑤. ① Decide on the size of the steel material to be heat treated and the necessary temperature rise. ② Obtain the steel material conveying speed and the power setting of each induction heating device when the number of passes is one. It is assumed that the heat treatment is performed once, so that the variables become the conveying speed of the steel and the power of each induction heating device, so that the limiting conditions are the upper limit temperature and the target temperature. The objective function is to unlock the most appropriate composition of heat treatment time and power consumption. problem. In this case, it can be solved by using the most appropriate methods such as linear planning method and non-linear day counting method, and by appropriately changing each variable, the heat treatment time can be minimized and the power consumption can be reduced. The combination of the transfer speed and the power can be unlocked. ③ Determine the transfer speed and power settings of each induction heating device when the number of passes is three. It is assumed that the heat treatment is performed three times, so that the variable becomes the power of each induction heating device, and the limiting conditions are the upper limit temperature and the target temperature. The objective function is to solve the optimization problem caused by the amount of power consumption. In this case, it can be solved by using the most appropriate method such as linear planning method and non-linear day counting method, and it can also be solved by finding the power combination that minimizes power consumption by appropriately changing each variable. open. ④ Calculate the transfer speed and power settings of each induction heating device when the number of passes is multiple. Similarly to the above-mentioned ③, the number of passing times of 5 times and 7 times is increased, and the combination of the steel conveying speed of each time and the power of each induction heating device is obtained. The maximum number of passes is determined in advance by the size of the steel material and the amount of temperature rise, and the processing up to the number 13 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 is performed. ⑤ Determine the number of passes. Determines the number of passes and the speed at which the heat treatment time is minimized. In addition, it is not described in Table 1, but it is also determined that the power setting at this time is 0.
接著，在實際進行熱處理之情況，藉由鋼材之種類和熱 處理條件及尺寸而選擇賦予至表1之通過次數和搬送速 度，來進行熱處理。 此時，實測初期溫度，在不同於假設之初期溫度之情 況，根據這個而修正電力設定。Next, when the heat treatment is actually performed, the heat treatment is performed by selecting the number of passes and the conveyance speed given to Table 1 according to the type of the steel, the heat treatment conditions, and the size. At this time, if the actual measured initial temperature is different from the assumed initial temperature, the power setting is corrected based on this.
表1 幅寬 (mm) 1000 2000 3000 厚度 (刪） 通過 次婁文 献1 艇2 4^3 舰 次數 細 聽2 赖3 通過 次數 賴 iM2 献3 10 1 60 1 40 1 20 20 1 40 1 20 3 30 40 40 30 1 20 3 30 40 40 3 20 30 30 (第4實施形態） 在通過次數為3次以上而進行反向熱處理之情況，在各 回之每1次，改變鋼材搬送速度。正如在第3實施形態所 示，為了滿足溫度限制條件而使得熱處理時間和消耗電力 變得最小，因此，有效地在各回之每 1次，改變搬送 速度。 (第5實施形態） 在通過次數為3次以上之η次而進行反向熱處理之情 14 312/發明說明書(補件)/92-09/92121473 1225100 況，使得第η次和第（η — 1 )次之鋼材搬送速度更加快於 第（η — 2 )次以前之鋼材搬送速度而縮短熱處理時間。 例如在以3次而進行熱處理之情況，使得鋼材搬送速 度，成為第1次 < 第2次、第1次 < 第3次。藉由第1次 之熱處理而使得鋼材升溫，因此，可以提高第2次、第3 次之搬送速度，能夠在全部次數，比起以相同之搬送速度 來進行熱處理，還更加縮短熱處理時間，並且，也可以降 低消耗電力。 (第6實施形態） 首先，就該實施形態之基本想法而進行說明。 假設在熱軋後、來使得淬火或急速冷卻之鋼材通過配置 在熱軋線上之感應加熱裝置而進行熱處理之方法，有使得 鋼材通過次數成為1次來增多感應加熱裝置之台數而進行 熱處理之方法以及不增多感應加熱裝置之台數而增加通過 次數來往復著鋼材以便於進行反向熱處理之方法。 因此，使得厚度25mm、長度25m、幅寬3.5m之鋼材，成 為加熱起始溫度4 5 0 °C、表面上限溫度7 1 0 °C之限制之根本 而成為目標溫度6 5 0 °C ，比較在以下（A )〜（C )事例而 進行熱處理之情況之熱處理時間。 (A)感應加熱裝置6台、1次 (B )感應加熱裝置3台、1次 (C )感應加熱裝置3台、3次 就前述3個事例而言，分別算出滿足前述溫度條件之最 適當鋼材之搬送速度、感應加熱裝置之電力，結果，成為 15 312/發明說明書(補件)/92-09/92121473 1225100 以下記述。 (A) 搬送速度：55m/min、電力原單位：56.6kWh/ton (B) 搬送速度：15m/niin、電力原單位：50.8kWh/ton (C) 搬送速度：第 1 次：50m/min、第 2 次：120m/min、 第 3 次：120m/min、電力原單位：55.6kWh/ton 在圖3，顯示在藉由前述條件而進行熱處理時之鋼材之 表面溫度、板厚中心部之溫度及平均溫度之熱處理圖案。 圖3 A係事例A之結果，圖3 B係事例B之結果，圖3 C係事 例C之結果。在此，溫度係鋼材前端部之溫度。此外，在 圖中，表面溫度在短時間（5秒鐘左右）呈上下地形成波 峰之期間係鋼材前端部通過感應加熱裝置之時間，在圖3 A 之感應加熱裝置為6台而進行1次之情況，有6個波峰， 在圖3 B，感應加熱裝置係3台而進行1次，因此，出現3 個波峰，在圖3 C，感應加熱裝置係3台而進行3次，因此， 出現3次且有3個波峰。在圖3 C，顯示第1次通過之3個 波峰和顯示第2次通過之3個波峰在時間上大幅度地錯 開，係正如前面敘述，由於進行鋼材前端部之溫度測定， 一直到在第1次通過之鋼材後端部脫離為止和一直到在第 2次通過之鋼材前端部進入為止之時間變長之緣故。此 外，控制表面溫度之波峰值而不超過居里點或A c 1變態 點。可以藉此而得到所要求之特性、例如硬度或韌性。 接著，若比較圖3 A〜3 C時，在圖3 B熱處理時間成為1 2 0 秒鐘而較圖3 A之熱處理時間9 0秒鐘要長，係因為感應加 熱裝置之台數變少，而為了在相同溫度條件進行熱處理， 16 312/發明說明書(補件)/92-09/92121473 1225100 而有必要使得鋼材之搬送速度變慢之緣故。 此外，在圖3 C，感應加熱裝置為3台，但是，藉由通過 次數成為3次而使得熱處理時間成為8 0秒鐘，而較圖3 A 之感應加熱裝置為6台1次之情況更短。這個係由於在通 過次數成為1次之情況，使得鋼材之搬送速度成為一定條 件，但是，可以在3次之情況，配合熱處理而改變搬送速 度，以短時間來進行熱處理之緣故。此外，電力原單位係 也更加少於感應加熱裝置為6台之情況。 由此而得知：比起設置許多個感應加熱裝置而以1次來 進行加熱之情況，則設置適當台數之感應加熱裝置而進行 複數次之反向熱處理係比較能夠以短時間且少電力量，來 進行熱處理。並且，能夠減少設備費非常高之感應加熱裝 置之台數。在前述例子，相對於感應加熱裝置為6台而可 以3台結束，能夠減低設備費至1 / 2〜2 / 3。此外，設置 空間係也變少。 此外，在此並無顯示，但是，在感應加熱裝置成為2台 而使得通過次數成為複數次之情況，多少增加熱處理時 間，但是，可以相當程度地削減設備費或設置空間。 此外，在感應加熱裝置成為4台或5台而使得通過次數 成為複數次來進行熱處理之情況，多少增加設備費或設置 空間，但是，可以大幅度地縮短熱處理時間。 進行複數次往復之熱處理方法，係不需要一定適用在所 有鋼材上，也可以適用在進行複數次之時間比較縮短之情 況或電力原單位變少之情況。例如3次或5次有效者係鋼 17 312/發明說明書(補件)/92-09/92121473 1225100 材尺寸變大、升溫量變大且需要許多電力之情況。因此， 在鋼材尺寸變小、升溫量變小之情況也有1次處理較為有 利之情況。例如在圖4，顯示在感應加熱裝置設為3台時 之藉由鋼材尺寸或升溫量而執行之熱處理時間之有利通過 次數，此外，在圖5，顯示電力原單位電力之有利通過次 數，在許多情況，有利於複數次之通過次數。但是，可以 確認：一部分也有1次處理變得有利之情況。 以上敘述之各個實施形態之複數次之通過次數係不僅是 奇數次，也可以是偶數次。 接著，說明成為本發明之鋼材之製造設備之實施形態。 在圖6，顯示成為本發明之鋼材之製造設備之其他例。 該製造設備係在同一熱軋線上，具備由加熱爐2 1、軋輥 機22、加速冷卻裝置23、矯正裝置24和複數台（在此為 3台）感應加熱裝置2 6所構成之感應加熱設備2 5。此外， 還附帶：用以設定搬送鋼材20之搬送滾筒27的速度之搬 送速度設定裝置28、用以供應電力至各個感應加熱裝置26 之電力供應裝置2 9、控制加熱爐2 1之加熱爐控制電腦3 1、 控制軋輥機2 2之軋制控制電腦3 2、控制加速冷卻裝置2 3 之冷卻控制電腦3 3、用以控制感應加熱設備2 5之演算裝 置34、以及進行整體生產管理之生產管理電腦40。接著， 在加熱爐2 1之出口側，設置溫度計3 0 a，在軋輥機2 2之 出口側，設置溫度計3 0 b，在冷卻裝置2 3之出口側，設置 溫度計3 0 c，在矯正裝置2 4之出入側，設置溫度計3 0 d和 溫度計3 0 e，在各個感應加熱裝置2 6之感應加熱設備2 5 18 312/發明說明書(補件)/92-09/92121473 1225100 之出入側，設置溫度計3 0 f〜3 0 k。 在前述製造設備中，鋼材2 0係在藉由加熱爐2 1來進行 加熱後，藉由軋輕機2 2而進行軋制，然後，藉由加速冷卻 裝置23來進行加速冷卻。接著，在藉由矯正裝置24而矯 正形狀後，藉由感應加熱裝置2 6來進行熱處理。 此時，加熱爐控制電腦3 1、軋制控制電腦3 2和冷卻控 制電腦3 3係追蹤鋼材2 0位處在何處，將該資訊輸入至演 算裝置3 4。演算裝置3 4係藉由進行既定演算而決定感應 加熱設備2 5之鋼材通過次數和搬送速度及加熱電力，將其 結果輸出至搬送速度設定裝置2 8和電力供應裝置2 9，以 便於控制感應加熱設備2 5。 接著，使用圖7〜圖1 0而說明加熱爐控制電腦31、軋 制控制電腦3 2、冷卻控制電腦3 3和演算裝置3 4之處理内 容。 在圖7，顯示用以控制加熱爐21之加熱爐控制電腦31 之構造。 加熱爐控制電腦3 1係由輸入裝置3 1 a、輸出入控制部 3 1 b、中央處理裝置3 1 c、記憶裝置3 1 d和輸出裝置3 1 e所 構成。此外，記憶裝置3 1 d係可以是固定式磁碟、軟碟、 記憶體之任何一種。這個係即使是就以下敘述之其他電腦 之記憶裝置而言，也是相同的。 在圖8，顯示用以控制軋輥機2 2之軋制控制電腦3 2之 構造。 軋制控制電腦3 2係由輸入裝置3 2 a、輸出入控制部 19 312/發明說明書(補件)/92-09/92121473 1225100 3 2 b、中央處理裝置3 2 c、記憶裝置3 2 d和輸出裝置3 2 e所 構成。 在圖9，顯示用以控制冷卻裝置2 3之冷卻控制電腦3 3 之構造。 冷卻控制電腦3 3係由輸入裝置3 3 a、輸出入控制部 3 3 b、中央處理裝置3 3 c、記憶裝置3 3 d和輸出裝置3 3 e所 構成。 在圖1 0，顯示用以控制感應加熱設備2 5之演算裝置3 4 之構造。 演算裝置34係由輸入裝置34a、輸出入控制部34b、中 央處理裝置3 4 c、第1記憶裝置3 4 d、第2記憶裝置3 4 e、 第3記憶裝置34f和輸出裝置34g所構成。 首先，加熱爐控制電腦3 1、軋制控制電腦3 2和冷卻控 制電腦3 3係藉著由生產管理電腦4 0，傳送現在處理中或 由此所處理之鋼材2 0之各種資訊（鋼材資訊），儲存在各 個記憶裝置中’以包含在該鋼材資訊中之尺寸（幅寬、厚 度、長度）、加熱目標溫度、鋼種等，作為基礎而預先進行 設定或算出，以便於設定加熱爐2 1、軋輥機2 2和冷卻裝 置2 3之操作作業條件，同時，進行以下之處理。 也就是說，加熱爐控制電腦3 1係例如圖7所示，藉由 輸入裝置3 1 a而放入加熱爐出口側溫度計3 0 a之訊號輸 入，透過輸出入控制部3 1 b，藉由中央處理裝置3 1 c，以一 定時間週期（例如1 0 0 m s e c )，來監視溫度。作為一例係由 每單位時間之溫度變化而判斷是否由加熱爐2 1之出口側 20 312/發明說明書(補件)/92-09/92121473 1225100 來搬出鋼材2 0。使得由此時之加熱爐2 1所搬出之時刻， 成為加熱結束時刻，寫入至記憶裝置3 1 d，同時，透過輸 出裝置3 1 e而傳送至演算裝置3 4。時刻係可以使用計算構 裝在加熱爐控制電腦3 1内部之現在時刻之計時器功能，也 可以參照由生產管理電腦4 0所輸入之時刻或由外部輸入 之時刻。 此外，軋制控制電腦32係正如例如圖8所示，藉由輸 入裝置3 2 a而放入軋輥機出口側溫度計3 0 b之訊號輸入， 透過輸出入控制部32b，藉由中央處理裝置32c，以一定時 間週期（例如1 0 0 m s e c )，來監視溫度。藉由每單位時間之 溫度變化而判斷是否由軋輥機2 2出口側來搬出鋼材2 0。 軋制控制電腦3 2係也使得此時之鋼材2 0由軋輥機2 2出去 之時刻，成為軋制結束時刻，寫入至記憶裝置3 2 d，同時， 透過輸出裝置3 2 e而傳送至演算裝置3 4。時刻之設定係相 同於加熱爐控制電腦3 1，藉由來自内部之計時器功能或生 產管理電腦4 0或者是外部之輸入參照而進行。 此外，冷卻控制電腦3 3係正如例如圖9所示，藉由輸 入裝置3 3 a而放入冷卻裝置出口側溫度計3 0 c之訊號輸 入，透過輸出入控制部33b，藉由中央處理裝置33c，以一 定時間週期（例如1 0 0 m s e c )，來監視溫度。藉由每單位時 間之温度變化而判斷是否由冷卻裝置2 3出口側來搬出鋼 材2 0。使得此時之鋼材2 0由冷卻裝置2 3出去之時刻，成 為冷卻結束時刻，寫入至記憶裝置3 3 d。此外，輸入由生 產管理電腦4 0所傳送之鋼材資訊、由加熱爐控制電腦3 1 21 312/發明說明書(補件)/92-09/92121473 1225100 所傳送之加熱結束時刻和由軋制控制電腦3 2所傳送之軋 制結束時刻，寫入至記憶裝置3 3 d。接著，透過輸出裝置 3 3 e而傳送鋼材資訊和冷卻結束時刻至演算裝置3 4。時刻 之設定係相同於加熱爐控制電腦3 1，藉由來自内部之計時 器功能或生產管理電腦4 0或者是外部之輸入參照而進行。 接著，演算裝置3 4係將來自生產管理電腦4 0之鋼材資 訊、來自加熱爐控制電腦3 1之加熱結束時刻和來自軋制控 制電腦3 2之軋制結束時刻和來自冷卻控制電腦3 3之冷卻 結束時刻，透過輸入裝置3 4 a和輸出入控制部3 4 b而傳送 至中央處理裝置34c，寫入至第1記憶裝置34d。此外，在 第2記憶裝置3 4 e，預先寫入：由鋼材2 0之尺寸和升溫量 之組合條件而設定在感應加熱設備2 5所容許之通過次數 之表格、對應於該通過次數而設定由鋼材2 0之尺寸和升溫 量之組合所決定之感應加熱設備2 5内之鋼材2 0的搬送速 度來進行對應之複數個表格、以及設定在決定通過次數和 搬送速度時之由鋼材2 0之尺寸和升溫量所決定之消耗電 力之複數個表格。這些表格係在決定通過次數、搬送速度 和加熱電力時而進行參照。此外，在第3記憶裝置3 4 ί， 寫入：成為藉由演算裝置3 4所算出之利用鋼材條件而容許 之通過次數、搬送速度和電力之組合之熱處理圖案、以及 下一個鋼材之冷卻結束之預定時刻。接著，演算裝置3 4 係藉由以下敘述之演算處理而決定就鋼材2 0而言之感應 加熱設備2 5之通過次數、搬送速度和加熱電力，透過輸出 入控制部3 4 b而由輸出裝置3 4 g，將通過次數和搬送速度， 22 312/發明說明書(補件)/92-09/92121473 1225100 輸出至搬送速度設定裝置28，將加熱電力值輸出至電力供 應裝置2 9。在此，所謂熱處理圖案係表示為了使得鋼材成 為所要求之特性而對於用以藉由感應加熱設備2 5來進行 熱處理之感應加熱設備2 5之設定參數組合之條件，在該實 施形態，成為通過次數、搬送速度和電力之組合係除了這 個以外，還可以加入對於配合鋼材之長邊位置而改變電力 設定值或搬送速度之設定值或者是改變使用在每一個通過 次數之感應加熱設備之台數之條件等之鋼材加熱溫度變化 來造成影響之參數，來成為熱處理圖案。 以下，使用圖1 1〜圖1 4，來說明用以決定演算裝置3 4 之前述熱處理圖案（通過次數、搬送速度和電力之組合） 之演算處理之順序。此外，在以下之演算中，使得通過次 數，成為用以求出各種熱處理圖案之基準參數，首先，在 就數個通過次數而求出熱處理圖案後，選擇時間或電力等 之最適當之熱處理圖案。 圖1 1係顯示演算處理之整體流程之圖。 在前面鋼材之演算結束之時間點，開始就對象材（現在 加熱處理中之鋼材之下一個加熱處理之鋼材）之演算，藉 由以下之步驟1〜4之順序而進行演算。 步驟1 :根據尺寸和升溫量，參照第2記憶裝置34e之 可加熱通過次數表，而使得可加熱通過次數（例如1次、3 次和5次），成為用以進行下一個步驟以後之演算之通過次 數之候補。 步驟2 :根據在步驟1所選擇之通過次數，而算出對應 23 312/發明說明書(補件)/92-09/9212 M73 1225100 於各個次數之搬送速度和加熱電力。正如圖1 2所示，在計 算搬送速度和加熱電力之方法，有：由預先設定之表格來 根據條件而參照及決定搬送速度和加熱電力之方法以及根 據熱處理條件而由加熱模型計算來算出最適當解之方法。 因此，最初判斷搬送速度係是否藉由參照表格而求出或者 是藉由最適當化計算而求出。通常係選擇可高精度地進行 溫度控制之最適當化計算，但是，在不需要高精度且溫度 條件不嚴格之情況或者是對於具有目前為止所沒有之成分 之鋼材來進行熱處理之情況，也有藉由參照表格而進行之 狀況發生。 在搬送速度不參照表格之情況，藉由最適當化計算而決 定搬送速度和加熱電力，算出處理時間。 另一方面，在搬送速度參照表格之情況，根據通過次 數、鋼材尺寸和升溫量之值，而參照記憶在第2記憶裝置 34e之速度表，算出搬送速度。 同樣地，即使是關於加熱電力，也判斷是否藉由參照表 格而決定或者是藉由最適當化計算而決定。 在不參照表格之情況，於藉由最適當化計算而求出加熱 電力後，算出處理時間，來決定加熱電力。 另一方面，在加熱電力參照表格之情況，根據通過次 數、搬送速度、鋼材尺寸和升溫量之值，而參照記憶在第 2記憶裝置34e之電力表，算出加熱電力。 在前述演算僅在步驟1成為候補之通過次數部分、例如 1次、3次和5次成為候補之情況，就各個而進行計算，因 24 312/發明說明書(補件)/92-09/92121473 1225100 此，進行合計3次之演算，算出對應於各次數之搬送$ 加熱電力和處理時間。在此所算出之結果係儲存在第 憶裝置34f 。 步驟3 :根據在步驟2所算出之結果，而決定最適 過次數。正如圖1 3所示，藉由冷卻裝置出口側溫度tl 而檢查對象材之冷卻是否結束。這個係由於為了正確 出在感應加熱設備2 5之熱處理所能夠容許之時間（目 理時間）而以離開冷卻裝置2 3之時間作為基準來算出 之緣故。此外，通常，目標處理時間係在下一個鋼材 機於熱處理步驟之前面步驟就結束之時間或者是超過 處理時間之時，設定在下一個鋼材之待機時間變得最 時間。接著，在對象材離開冷卻裝置2 3之時間，開始 演算。 首先，得到下一個鋼材之冷卻結束預定時刻，求出 象材之冷卻結束時刻間之時間差，算出對象材之目標 時間。此外，在此，根據冷卻結束時刻而算出目標處 間，但是，也可以根據對於感應加熱設備2 5之到達時 算出目標處理時間。 接著，判斷處理時間是否優先。通常處理時間越短 電力也變得更少，因此，選擇處理時間優先且處理時 短之通過次數。在不優先處理時間之情況，例如在下 鋼材之搬送延遲而得到非常長之目標處理時間之情況 目標處理時間内來完成加熱之條件中，選擇加熱電力 最小之通過次數。 312/發明說明書(補件)/92-09/92121473 I度、 3記 當通 •30c 地算 標處 時間 不待 目標 短之 進行 和對 處理 理時 刻而 ，則 間最 一個 ，於 變得 25 1225100 步驟4 :最後，配合在步驟3所決定之通過次數而決定 搬送速度和加熱電力。也就是說，藉此而決定感應加熱設 備2 5之熱處理圖案。 此外，在前述步驟，通過次數、搬送速度和電力係由鋼 材尺寸和升溫量所算出，但是，除了這個以外，鋼種類係 也可以加入在條件中。 接著，使用圖1 4而說明在步驟3所敘述之下一個鋼材 之冷卻結束預定時刻之算出方法。 鋼材2 0之位置係藉由各個電腦3 1〜3 3而進行追蹤。追 蹤之方法係藉由加熱爐出口側溫度計3 0 a和軋輥機出口側 溫度計3 0 b之輸出而進行，但是，也可以使用利用紅外線 等之通過檢測感測器或者是利用在軋輥機内之軋輥之荷重 0N (導通）/ OFF (截止）或馬達之電流負荷等之值。 首先，控制加熱爐2 1之加熱爐控制電腦3 1係追蹤下一 個鋼材，記憶下一個鋼材離開加熱爐2 1之時刻，同時，將 該時刻資料傳送至演算裝置3 4。 演算裝置3 4係根據所輸入之時刻資料，由搬送速度和 移動距離而算出下一個鋼材離開冷卻裝置2 3之預定時 刻。所算出之下一個鋼材之冷卻結束預定時刻係記憶在演 算裝置3 4之第3記憶裝置3 4 f。 此外，控制軋輥機2 2之軋制控制電腦3 2係也追蹤下一 個鋼材，記憶下一個鋼材離開軋輥機2 2之時刻，同時，將 該時刻資料傳送至演算裝置3 4。 演算裝置3 4係根據所輸入之時刻資料，再一次地由搬 26 312/發明說明書(補件)/92-09/92121473 1225100 送速度和移動距離而算出下一個鋼材離開冷卻裝置2 3之 預定時刻。所算出之下一個鋼材之冷卻結束預定時刻係重 新寫入在演算裝置3 4之第3 ·記憶裝置3 4 f。可以藉此而更 加正確地算出下一個鋼材之冷卻結束預定時刻。在該情 況，藉由演算裝置3 4而進行冷卻結束預定時刻之計算，但 是，也可以藉由加熱爐控制電腦3 1、軋制控制電腦3 2和 冷卻控制電腦3 3而進行，將其結果傳送至演算裝置3 4。 本發明之製造方法係不僅用以使得鋼板之板厚方向之 溫度分布變得均勻，同時，也可以適用在板厚方向來設置 溫度差之情況。 (實施例） 使用圖1及圖2所示之鋼材之製造設備，進行鋼材之聯 機熱處理。在此，感應加熱裝置係成為呈串聯地配置3台 螺線管型感應加熱裝置之構造。鋼材A、B係在水冷裝置， 進行加速冷卻至4 0 0 °C為止，鋼材C、D係在1 0 0 °C進行淬 火處理。在冷卻後，進行回火熱處理而使得板厚中心部成 為6 0 0 °C 。此外，鋼材表面溫度之上限係成為這些鋼材之 Acl變態點之7 2 0 °C 。 在表2，顯示在以鋼材A〜D之通過次數1次和3次而進 行熱處理時之熱處理時間。 在此，求出在以通過次數1次和3次而進行時之搬送速 度和電力量，判斷在何處進行處理。從而得知：最適當化 計算之結果和熱處理時間變短係必須在鋼材A、C成為1 次、在鋼材B、D成為3次而進行。 27 312/發明說明書(補件)/92-09/92121473 1225100 此外，在該實施例，控制鋼材之中心溫度成為既定溫度， 但是，也可以不是中心部而控制在鋼材内部任意位置之溫 度。 表2 A B C D 鋼材尺寸（厚度X幅寬mm) 15x3500 2 5 X 3 5 0 0 1 5 X 3 5 0 0 25x3500 加熱前溫度（°C ) 4 0 0 4 0 0 10 0 10 0 熱處理溫度（°C ) 6 0 0 6 0 0 6 0 0 6 0 0 升溫量（°C ) 2 0 0 2 0 0 5 0 0 5 0 0 每1回通過次數時之搬送 速度（m / s ) 0.33 0.17 0.17 0.08 每1回通過次數時之電力 (kWh ) 15.7 2 8.2 3 3.7 58.7 每1回通過次數時之熱處 理時間（s ) 18 6.0 3 2 4.0 3 6 6.0 6 4 2.0 每3回通過次數 時之搬送速度 (m / s ) 第1次 0.67 0.33 0.33 0.17 第2次 1.17 0.83 0.67 0.5 第3次 1.0 0.67 0 . 5 0.33 每3回通過次數時之電力 (kWh ) 2 2.8 3 8.4 4 0.4 7 1.0 每3回通過次數時之熱處 理時間（s ) 2 0 7.4 3 0 8.1 3 9 6.0 5 8 9.0 【圖式簡單說明】 圖1係顯示成為本發明之鋼材之製造設備之一例之圖。 圖2係顯示圖1之感應加熱裝置之詳細之圖。 圖3 A〜圖3 C係比較由於感應加熱裝置之台數和通過次 數之不同所造成之熱處理圖案之圖。 圖4係顯示有利於熱處理時間之通過次數之圖。 圖5係顯示有利於電力原單位之通過次數之圖。 28 312/發明說明書(補件)/92-09/92121473 1225100 圖6係顯示成為本發明之鋼材之製造設備之其他例之 圖。 圖7係顯示圖6之加熱爐控制電腦之構造之圖。 圖8係顯示圖6之軋制控制電腦之構造之圖。 圖9係顯示圖6之冷卻控制電腦之構造之圖。 圖1 0係顯示圖6之演算裝置之構造之圖。 圖1 1係顯示演算處理之整體流程之圖。 圖1 2係顯示演算處理之詳細流程之圖。 圖1 3係顯示演算處理之詳細流程之圖。 圖1 4係顯示用以算出下一個鋼材之冷卻結束預定時刻 之流程之圖。 (元件符號說明） 1 熱軋輥機 2 鋼材 3 水冷裝置 4 橋正機 5 感應加熱裝置 6 溫度檢測器 7 搬送滾筒 8 速度檢測器 9 控制裝置 10 電力供應裝置 11 溫度檢測器 2 0 鋼材 29Table 1 Width (mm) 1000 2000 3000 Thickness (deleted) Passed by Cilou Literature 1 Boat 2 4 ^ 3 Number of ships listened 2 Lai 3 Passes Lai iM2 Dedicated 3 10 1 60 1 40 1 20 20 1 40 1 20 3 30 40 40 30 1 20 3 30 40 40 3 20 30 30 (Fourth embodiment) In the case where the reverse heat treatment is performed three or more times, the steel material conveying speed is changed every time in each round. As shown in the third embodiment, the heat treatment time and power consumption are minimized in order to satisfy the temperature limitation conditions. Therefore, it is effective to change the conveying speed every time in each cycle. (Fifth Embodiment) In the case where the reverse heat treatment is performed at a number of passes of η times 3 or more 14 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100, the ηth and (η- 1) The speed of steel material transfer is faster than the steel material transfer speed before (η-2) time, and the heat treatment time is shortened. For example, in the case where heat treatment is performed three times, the steel material conveying speed becomes the first time < the second time, and the first time < the third time. The first heat treatment increases the temperature of the steel. Therefore, the second and third conveying speeds can be increased. The heat treatment can be performed at the same conveying speed at all times, and the heat treatment time can be shortened. , Can also reduce power consumption. (Sixth Embodiment) First, the basic idea of this embodiment will be described. It is assumed that after hot rolling, a method for heat-treating a quenched or rapidly cooled steel material through an induction heating device arranged on a hot rolling line is performed. The number of passes of the steel material is increased to increase the number of induction heating devices for heat treatment. A method and a method for reciprocating steel materials by increasing the number of passes without increasing the number of induction heating devices to facilitate reverse heat treatment. Therefore, the thickness of 25mm, length of 25m, and width of 3.5m becomes the target temperature of 650 ° C as the root of the heating starting temperature of 450 ° C and the surface upper limit temperature of 7110 ° C. The heat treatment time when the heat treatment is performed in the following cases (A) to (C). (A) 6 induction heating devices, 1 (B) 3 induction heating devices, 1 (C) 3 induction heating devices, and 3 times For the above three cases, calculate the most appropriate ones to meet the above temperature conditions. The conveying speed of the steel and the power of the induction heating device are described below as 15 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100. (A) Transfer speed: 55m / min, original power unit: 56.6kWh / ton (B) Transfer speed: 15m / niin, original power unit: 50.8kWh / ton (C) Transfer speed: First time: 50m / min, The second time: 120m / min, the third time: 120m / min, the original power unit: 55.6kWh / ton. In Fig. 3, the surface temperature of the steel material and the temperature at the center of the plate thickness are shown when the heat treatment is performed under the aforementioned conditions. And average temperature heat treatment pattern. Figure 3 is the result of Case A, Figure 3 is the result of Case B, and Figure 3 is the result of Case C. Here, the temperature refers to the temperature of the steel tip. In addition, in the figure, the period during which the surface temperature peaks up and down in a short time (about 5 seconds) is the time when the front end of the steel material passes through the induction heating device, and the induction heating device in FIG. In the case, there are 6 peaks. In FIG. 3B, three induction heating devices are performed once, and therefore, three peaks appear. In FIG. 3C, three induction heating devices are performed three times. Therefore, 3 times with 3 peaks. In Fig. 3C, the three peaks showing the first pass and the three peaks showing the second pass are greatly shifted in time. As described above, the temperature measurement of the front end of the steel is performed until the first time. The length of time between the end of the steel material passing through the first pass and the entry of the steel material passing through the second pass is longer. In addition, the peak value of the surface temperature is controlled without exceeding the Curie point or A c 1 metamorphosis point. This makes it possible to obtain desired properties, such as hardness or toughness. Next, when comparing Figs. 3A to 3C, the heat treatment time in Fig. 3B becomes 120 seconds, which is longer than the heat treatment time of 90 seconds in Fig. 3A, because the number of induction heating devices becomes smaller. In order to perform heat treatment at the same temperature conditions, 16 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100, it is necessary to slow down the conveying speed of the steel. In addition, in FIG. 3C, the number of induction heating devices is three, but the heat treatment time is 80 seconds by the number of passes being three times, which is more than the case where the number of induction heating devices in FIG. 3A is six. short. This is because when the number of passes becomes one, the steel material conveying speed becomes a certain condition. However, in the case of three times, the conveying speed can be changed in accordance with the heat treatment, and the heat treatment can be performed in a short time. In addition, the electric power unit system is even less than when the induction heating device is six. This shows that, compared with a case where a plurality of induction heating devices are installed and heated once, it is possible to install a suitable number of induction heating devices and perform multiple reverse heat treatments in a short time and with less power. Heat treatment. In addition, it is possible to reduce the number of induction heating devices having a very high equipment cost. In the aforementioned example, the number of induction heating devices can be reduced to six and three can be completed, which can reduce the equipment cost to 1/2 to 2/3. In addition, there are fewer installation space systems. It is not shown here. However, in the case where the number of passes of the induction heating device is two and the number of passes is increased, the heat treatment time is increased to some extent. However, the equipment cost or installation space can be reduced considerably. In addition, when the number of induction heating devices is four or five and the number of passes is used to perform the heat treatment, the equipment cost or installation space is increased somewhat, but the heat treatment time can be shortened significantly. The heat treatment method of performing multiple reciprocations does not necessarily need to be applied to all steel materials, but can also be applied in the case where the time required for the multiple repetitions is shortened or the original power unit is reduced. For example, 3 or 5 times effective is steel 17 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 The case where the size of the material becomes larger, the heating amount becomes larger, and a lot of electricity is required. Therefore, when the size of the steel material becomes smaller and the temperature rise amount becomes smaller, it may be advantageous to perform one treatment. For example, in FIG. 4, the number of favorable passes of the heat treatment time performed by the size of the steel material or the amount of heating when the induction heating device is set to 3 is shown. In addition, FIG. 5 shows the number of favorable passes of the original unit power of the electric power. In many cases, multiple passes are beneficial. However, it can be confirmed that a part of the treatment may be advantageous in some cases. The number of times of the plural passes of each of the embodiments described above is not only an odd number but also an even number. Next, an embodiment of a production facility for a steel material according to the present invention will be described. FIG. 6 shows another example of the manufacturing equipment for the steel material of the present invention. This manufacturing equipment is on the same hot rolling line, and includes induction heating equipment consisting of a heating furnace 21, a roll mill 22, an accelerated cooling device 23, a correction device 24, and a plurality of (three here) induction heating devices 26. 2 5. In addition, it also includes: a conveying speed setting device 28 for setting the speed of the conveying drum 27 for conveying the steel material 20, a power supply device 2 for supplying power to each induction heating device 26, and a heating furnace control for controlling the heating furnace 21 Computer 3 1. Rolling control computer 3 controlling roll machine 2 2 Cooling control computer 3 controlling acceleration cooling device 2 3 Calculation device 34 for controlling induction heating device 2 5 and production for overall production management Management computer 40. Next, a thermometer 3 0 a is provided on the exit side of the heating furnace 21, a thermometer 3 0 b is provided on the exit side of the roll mill 22, and a thermometer 3 0 c is provided on the exit side of the cooling device 23. On the entrance side of 2 4, a thermometer 3 0 d and a thermometer 3 e are installed on the induction heating equipment 2 6 of each induction heating device 2 5 18 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100, Set the thermometer from 30 f to 30 k. In the aforementioned manufacturing equipment, the steel material 20 is heated by a heating furnace 21, and then rolled by a light rolling machine 22, and then accelerated cooling is performed by an accelerated cooling device 23. Next, after the shape is corrected by the correction device 24, heat treatment is performed by the induction heating device 26. At this time, the heating furnace control computer 3 1, the rolling control computer 32, and the cooling control computer 3 3 track the position of the 20th position of the steel, and input the information to the calculation device 34. The calculation device 3 4 determines the number of steel materials passing times and the conveying speed and heating power of the induction heating device 25 by performing a predetermined calculation, and outputs the results to the conveying speed setting device 28 and the power supply device 29 to control the induction. Heating equipment 2 5. Next, the processing contents of the heating furnace control computer 31, the rolling control computer 3 2, the cooling control computer 3 3, and the calculation device 34 will be described with reference to Figs. 7 to 10. In Fig. 7, the structure of a heating furnace control computer 31 for controlling the heating furnace 21 is shown. The heating furnace control computer 3 1 is composed of an input device 3 1 a, an input / output control unit 3 1 b, a central processing device 3 1 c, a memory device 3 1 d, and an output device 3 1 e. In addition, the storage device 3 1 d may be any of a fixed magnetic disk, a floppy disk, and a memory. This is the same even for the memory devices of other computers described below. In Fig. 8, the structure of a rolling control computer 32 for controlling the roll mill 22 is shown. The rolling control computer 3 2 is composed of an input device 3 2 a, an input / output control unit 19 312 / Invention Manual (Supplement) / 92-09 / 92121473 1225100 3 2 b, a central processing device 3 2 c, a memory device 3 2 d And output device 3 2 e. In Fig. 9, the structure of a cooling control computer 3 3 for controlling the cooling device 23 is shown. The cooling control computer 3 3 is composed of an input device 3 3 a, an input / output control unit 3 3 b, a central processing device 3 3 c, a memory device 3 3 d, and an output device 3 3 e. In Fig. 10, the structure of a calculation device 3 4 for controlling the induction heating device 25 is shown. The calculation device 34 is composed of an input device 34a, an input / output control unit 34b, a central processing device 3 4c, a first storage device 3 4d, a second storage device 3 4e, a third storage device 34f, and an output device 34g. First, the furnace control computer 3 1, the rolling control computer 3 2 and the cooling control computer 3 3 transmit various information (steel information) of the steel 20 currently being processed or processed by the production management computer 40. ), Stored in each memory device 'set or calculated in advance based on the size (width, thickness, length), heating target temperature, steel type included in the steel information, in order to set the heating furnace 2 1 The operating conditions of the rolling mill 22 and the cooling device 23 are as follows. That is, the heating furnace control computer 3 1 is shown in FIG. 7, and the signal input into the heating furnace outlet-side thermometer 3 0 a is input through the input device 3 1 a, and the input / output control unit 3 1 b is The central processing unit 3 1 c monitors the temperature for a certain period of time (for example, 100 msec). As an example, it is judged from the temperature change per unit time whether the steel material 20 is carried out from the outlet side of the heating furnace 21 1 20 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100. The time when the heating furnace 21 is carried out at this time becomes the heating end time, and is written into the memory device 3 1 d and transmitted to the calculation device 34 through the output device 3 1 e. The time can be calculated using the timer function of the current time built in the furnace control computer 31, or it can refer to the time input from the production management computer 40 or the time input from the outside. In addition, as shown in, for example, FIG. 8, the rolling control computer 32 is inputted with a signal inputted into the roll mill outlet-side thermometer 3 0 b through the input device 3 2 a, and through the input / output control unit 32 b, and through the central processing device 32 c. To monitor the temperature for a certain period of time (eg 100 msec). Whether or not the steel material 20 is unloaded from the exit side of the roll mill 22 is determined by the temperature change per unit time. The rolling control computer 3 2 also makes the time when the steel material 20 exits from the rolling machine 22 at this time becomes the rolling end time and writes it to the memory device 3 2 d, and at the same time, transmits it to the output device 3 2 e to Calculating device 3 4. The setting of the time is the same as that of the furnace control computer 3 1 and is performed by an internal timer function or a production management computer 40 or an external input reference. In addition, as shown in FIG. 9, for example, the cooling control computer 3 3 is inputted with a signal input from the cooling device outlet-side thermometer 3 0 c through the input device 3 3 a, through the input / output control section 33b, and through the central processing device 33c. To monitor the temperature for a certain period of time (eg 100 msec). Based on the temperature change per unit time, it is determined whether or not the steel material 20 is unloaded from the cooling device 23 outlet side. At this time, the time when the steel material 20 is removed from the cooling device 23 becomes the cooling end time and is written to the memory device 3 3 d. In addition, enter the steel information transmitted by the production management computer 40, the heating furnace control computer 3 1 21 312 / Invention Manual (Supplement) / 92-09 / 92121473 1225100, the heating end time transmitted by the heating control computer, and the rolling control computer. The rolling end time transmitted by 3 2 is written to the memory device 3 3 d. Then, the steel material information and the cooling end time are transmitted to the calculation device 34 through the output device 3 3e. The setting of the time is the same as that of the furnace control computer 31, and is performed by an internal timer function or a production management computer 40 or an external input reference. Next, the calculation device 34 is configured to transfer the steel information from the production management computer 40, the heating end time from the heating furnace control computer 31, the rolling end time from the rolling control computer 32, and the cooling control computer 3 3 to The cooling completion time is transmitted to the central processing unit 34c through the input device 3 4a and the input / output control unit 3 4b, and written to the first memory device 34d. In addition, in the second memory device 3 4 e, it is written in advance: a table set for the number of passes allowed by the induction heating device 25 according to the combination condition of the size of the steel material 20 and the heating amount, and set in accordance with the number of passes A number of tables corresponding to the conveying speed of the steel material 20 in the induction heating device 25 determined by the combination of the size of the steel material 20 and the heating amount, and the steel material 2 0 set when determining the number of passes and the conveying speed There are several tables of power consumption determined by the size and heating amount. These tables are referred to when determining the number of passes, transfer speed, and heating power. In addition, in the third memory device 34, it is written that the heat treatment pattern of the combination of the number of passes, the transfer speed, and the power allowed by the steel material conditions calculated by the calculation device 34 is completed, and the cooling of the next steel material is completed. Scheduled time. Next, the calculation device 3 4 determines the number of passes, the conveying speed, and the heating power of the induction heating equipment 25 with respect to the steel material 20 through the calculation processing described below, and the output device passes through the input / output control unit 3 4 b. 3 4 g, the number of passes and transfer speed, 22 312 / Invention Manual (Supplement) / 92-09 / 92121473 1225100 are output to the transfer speed setting device 28, and the heating power value is output to the power supply device 29. Here, the term “heat treatment pattern” means a condition for setting parameter combinations of the induction heating device 25 for performing heat treatment by the induction heating device 25 in order to make the steel have desired characteristics. In addition to this, the combination of number of times, transfer speed, and power can be added to change the power setting value or transfer speed setting value to match the long side position of the steel, or change the number of induction heating equipment used in each pass The conditions such as changes in the heating temperature of the steel material affect the parameters and become the heat treatment pattern. Hereinafter, the procedure of the calculation process for determining the aforementioned heat treatment pattern (combination of the number of passes, the transfer speed, and the power) of the calculation device 34 will be described using FIGS. 11 to 14. In addition, in the following calculations, the number of passes is used as a reference parameter for obtaining various heat treatment patterns. First, after obtaining the heat treatment pattern for several passes, the most appropriate heat treatment pattern such as time or power is selected. . Figure 11 is a diagram showing the overall flow of calculus processing. At the end of the calculation of the previous steel material, the calculation of the target material (the steel material that is currently heat-treated below the heat-treated steel material) is started, and the calculation is performed in the order of steps 1 to 4 below. Step 1: According to the size and heating amount, refer to the heatable passage count table of the second memory device 34e, so that the heatable passage times (such as 1, 3, and 5 times) become the calculations for the next step Candidates for the number of passes. Step 2: Based on the number of passes selected in step 1, calculate the transfer speed and heating power corresponding to 23 312 / Invention Manual (Supplement) / 92-09 / 9212 M73 1225100 for each number of passes. As shown in Fig. 12, the methods for calculating the conveying speed and heating power include: a method of referring to and determining the conveying speed and heating power according to conditions based on a pre-set table, and calculating the most by heating model calculation based on heat treatment conditions. Appropriate solution. Therefore, it is initially judged whether the conveyance speed is obtained by referring to a table or by an optimization calculation. Usually, the most suitable calculation for temperature control is selected with high accuracy. However, when high accuracy is not required and temperature conditions are not strict, or when heat treatment is performed on steel materials with components that have not been available so far, there are also borrow A situation occurs by referring to a table. When the transfer speed does not refer to the table, the transfer speed and heating power are determined by the optimum calculation, and the processing time is calculated. On the other hand, in the case of the transfer speed reference table, the transfer speed is calculated by referring to the speed meter stored in the second memory device 34e based on the values of the number of passes, the size of the steel material, and the amount of temperature rise. Similarly, even for heating power, it is judged whether or not it is determined by referring to a table or by optimization calculation. When the table is not referred to, the heating power is determined by the optimization calculation, and then the processing time is calculated to determine the heating power. On the other hand, in the case of the heating power reference table, the heating power is calculated by referring to the value of the number of passes, the conveying speed, the size of the steel material, and the amount of temperature rise, and referring to the power meter stored in the second memory device 34e. In the foregoing calculation, only the number of passages that become candidates in step 1 such as one, three, and five times becomes candidates, and calculations are made for each, because 24 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 In this way, a total of three calculations are performed to calculate the transfer $ heating power and processing time corresponding to each number of times. The result calculated here is stored in the memory device 34f. Step 3: Determine the optimal number of passes based on the result calculated in step 2. As shown in FIG. 13, it is checked whether the cooling of the target material is completed by the temperature t1 on the outlet side of the cooling device. This is because the time required to leave the cooling device 23 is used as a reference to accurately calculate the time (objective time) that can be allowed for the heat treatment in the induction heating device 25. In addition, usually, the target processing time is the time when the next steel machine finishes the previous step before the heat treatment step or when the processing time is exceeded, and the standby time of the next steel is set to the maximum time. Then, when the target material leaves the cooling device 23, the calculation is started. First, the next scheduled cooling end time of the steel material is obtained, the time difference between the cooling end times of the image material is obtained, and the target time of the target material is calculated. Here, the target time is calculated based on the cooling end time, but the target processing time may be calculated based on the arrival of the induction heating device 25. Next, it is determined whether the processing time is prioritized. Generally, the shorter the processing time, the less power becomes. Therefore, choose the number of passes with priority on processing time and shorter processing time. In the case where the processing time is not prioritized, for example, in the case where the target steel processing time is delayed to obtain a very long target processing time, the minimum number of passes of heating power is selected in the condition of completing heating within the target processing time. 312 / Invention Manual (Supplements) / 92-09 / 92121473 I degree, 3 notes pass • 30c Landmark calculation time does not wait for the target to be short and the processing time, but the most time, then becomes 25 1225100 Step 4: Finally, in accordance with the number of passes determined in step 3, the transfer speed and heating power are determined. That is, the heat treatment pattern of the induction heating device 25 is determined by this. In addition, in the foregoing steps, the number of passes, the transfer speed, and the power system are calculated from the size of the steel material and the amount of temperature rise. However, in addition to this, the steel type system can also be added to the conditions. Next, a method for calculating the scheduled completion time of cooling of the next steel material described in step 3 will be described with reference to FIG. 14. The position of the steel 20 is tracked by each of the computers 3 1 to 3 3. The tracking method is based on the output of the thermometer 3 a at the exit side of the heating furnace and the thermometer 30 b at the exit side of the roll mill. However, it is also possible to use a pass detection sensor using infrared rays or a roll in the roll mill. The load is 0N (on) / OFF (off) or the current load of the motor. First, the heating furnace control computer 31, which controls the heating furnace 21, tracks the next steel material, memorizes the moment when the next steel material leaves the heating furnace 21, and at the same time, transmits the data of that moment to the calculation device 34. The calculation device 34 calculates the scheduled time at which the next steel material will leave the cooling device 23 from the conveying speed and the moving distance based on the input time data. The calculated end time of cooling of the next steel material is calculated in the third memory device 3 4 f of the arithmetic device 34. In addition, the rolling control computer 32, which controls the roll machine 22, also tracks the next steel material, memorizes the moment when the next steel material leaves the roll machine 22, and simultaneously transmits the data of that moment to the calculation device 34. The calculation device 3 4 is based on the input time data and once again calculates the schedule for the next steel to leave the cooling device 2 3 by moving 26 312 / Invention Manual (Supplement) / 92-09 / 92121473 1225100 and sending speed and moving distance. time. The calculated scheduled completion time of the next steel material to be cooled is newly written in the calculation device 3 4th-the memory device 3 4 f. This can be used to more accurately calculate the scheduled end time of cooling of the next steel material. In this case, the calculation of the scheduled cooling completion time is performed by the calculation device 34. However, the calculation may be performed by the furnace control computer 31, the rolling control computer 3 2 and the cooling control computer 3 3, and the results may be obtained. Transmission to the calculation device 3 4. The manufacturing method of the present invention is not only used to make the temperature distribution in the thickness direction of the steel plate uniform, but also applicable to the case where a temperature difference is set in the thickness direction. (Example) The steel material manufacturing equipment shown in Figs. 1 and 2 was used to perform an on-line heat treatment of the steel material. Here, the induction heating device has a structure in which three solenoid-type induction heating devices are arranged in series. Steels A and B are quenched at 100 ° C in a water-cooled device and accelerated cooling to 400 ° C. Steels C and D are quenched at 100 ° C. After cooling, a tempering heat treatment is performed so that the center of the plate thickness becomes 600 ° C. In addition, the upper limit of the steel surface temperature is 720 ° C, which is the Acl abnormal point of these steels. Table 2 shows the heat treatment time when the heat treatment is performed once and three times for the steel materials A to D. Here, the conveyance speed and the amount of power when the number of passes is 1 and 3 are obtained, and it is determined where the processing is performed. Therefore, it was found that the results of the optimum calculation and the shortening of the heat treatment time must be performed once for steel materials A and C and three times for steel materials B and D. 27 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 In addition, in this embodiment, the center temperature of the steel material is controlled to be a predetermined temperature. However, the temperature may be controlled at an arbitrary position inside the steel material instead of the center portion. Table 2 ABCD steel dimensions (thickness X width mm) 15x3500 2 5 X 3 5 0 0 1 5 X 3 5 0 0 25x3500 Temperature before heating (° C) 4 0 0 4 0 0 10 0 10 0 Heat treatment temperature (° C ) 6 0 0 6 0 0 6 0 0 6 0 0 Heating rate (° C) 2 0 0 2 0 0 5 0 0 5 0 0 Transfer speed at each pass (m / s) 0.33 0.17 0.17 0.08 per Power at 1 pass (kWh) 15.7 2 8.2 3 3.7 58.7 Heat treatment time at 1 pass (s) 18 6.0 3 2 4.0 3 6 6.0 6 4 2.0 Transport speed at 3 passes (m / s) 1st 0.67 0.33 0.33 0.17 2nd 1.17 0.83 0.67 0.5 3rd 1.0 0.67 0. 5 0.33 Power per 3 passes (kWh) 2 2.8 3 8.4 4 0.4 7 1.0 3 passes Heat treatment time (s) 2 0 7.4 3 0 8.1 3 9 6.0 5 8 9.0 [Brief description of the drawings] FIG. 1 is a diagram showing an example of the manufacturing equipment for the steel material of the present invention. FIG. 2 is a detailed view showing the induction heating device of FIG. 1. FIG. Figures 3A to 3C are diagrams comparing heat treatment patterns caused by the difference between the number of induction heating devices and the number of passes. FIG. 4 is a graph showing the number of passes in favor of the heat treatment time. Figure 5 is a graph showing the number of passes in favor of the original power unit. 28 312 / Invention Specification (Supplement) / 92-09 / 92121473 1225100 Fig. 6 is a diagram showing another example of the manufacturing equipment for the steel material of the present invention. FIG. 7 is a diagram showing the configuration of a control computer of the heating furnace of FIG. 6. FIG. FIG. 8 is a diagram showing the construction of the rolling control computer of FIG. 6. FIG. FIG. 9 is a diagram showing the structure of the cooling control computer of FIG. 6. FIG. FIG. 10 is a diagram showing the structure of the calculation device of FIG. 6. Figure 11 is a diagram showing the overall flow of calculus processing. Figure 12 is a diagram showing the detailed flow of the calculation process. Figure 13 is a diagram showing the detailed flow of the calculation process. Fig. 14 is a diagram showing a flow for calculating a predetermined time for cooling completion of the next steel. (Description of component symbols) 1 hot rolling machine 2 steel 3 water cooling device 4 bridge main machine 5 induction heating device 6 temperature detector 7 conveying roller 8 speed detector 9 control device 10 power supply device 11 temperature detector 2 0 steel 29
312/發明說明書(補件)/92-09/92121473 1225100 2 1 加熱爐 22 軋輥機 23 加速冷卻裝置 24 矯正裝置 25 感應加熱設備 2 6 感應加熱裝置 27 搬送滾筒 28 搬送速度設定裝置 29 電力供應裝置 30a 溫度計 3 0b 溫度計 30c 溫度計 3 0 d 溫度計 3 0 e 溫度計 3 0 f〜3 0 k 溫度計 3 1 加熱爐控制電腦 31a 輸入裝置 3 1b 輸出入控制部 31c 中央處理裝置 3 1 d 記憶裝置 31e 輸出裝置 3 2 軋制控制電腦 32a 輸入裝置 3 2b 輸出入控制部 312/發明說明書(補件)/92-09/92121473 32c 中 央 處 理 裝 置 32d 記 憶 裝 置 32e 輸 出 裝 置 33 冷 卻 控 制 電 腦 33a 入 裝 置 33b 輸 出 入 控 制 部 33c 中 央 處 理 裝 置 33d 記 憶 裝 置 33e 輸 出 裝 置 34 演 算 裝 置 34a 輸 入 裝 置 34b 輸 出 入 控 制 部 34c 中 央 處 理 裝 置 34d 第 1 記 憶 裝 置 34e 第 2 記 憶 裝 置 34f 第 3 記 憶 裝 置 34g 出 裝 置 40 生 產 管 理 電 腦 1225100 312/發明說明書(補件)/92-09/92121473312 / Invention Manual (Supplement) / 92-09 / 92121473 1225100 2 1 Heating furnace 22 Roller machine 23 Accelerating cooling device 24 Correction device 25 Induction heating device 2 6 Induction heating device 27 Transporting drum 28 Transporting speed setting device 29 Power supply device 30a thermometer 3 0b thermometer 30c thermometer 3 0 d thermometer 3 0 e thermometer 3 0 f ~ 3 0 k thermometer 3 1 heating furnace control computer 31a input device 3 1b input / output control unit 31c central processing device 3 1 d memory device 31e output device 3 2 Rolling control computer 32a input device 3 2b Input / output control section 312 / Invention manual (Supplement) / 92-09 / 92121473 32c Central processing device 32d Memory device 32e Output device 33 Cooling control computer 33a Input device 33b Input / output control Section 33c Central processing device 33d Memory device 33e Output device 34 Calculation device 34a Input device 34b Input / output control section 34c Central processing device 34d First storage device 34e Second storage device 34f Third storage device 34g Output device 40 Production Management Computer 1225100 312 / Invention Specification (Supplement) / 92-09 / 92121473