JP4227354B2 - Apparatus and method for creating a heating schedule in a hot rolling mill. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heating RoSoIri schedule creation device and method of the hot rolling mill.
[0002]
[Prior art]
Several hot rolling mill logistics scheduling devices have been proposed so far, such as Japanese Patent Laid-Open No. 6-304619, but how to meet rolling restrictions such as width and thickness transitions or distribution to multiple furnaces. Most of them consider how to do it, and none have a scheduling function for high temperature charging.
[0003]
When there are multiple heating furnaces, the heating furnace charging schedule and the rolling schedule creation in the hot rolling mill are used to charge the hot pieces directly sent from the CC and the cold pieces staying in the hot rolling yard into different heating furnaces. Of course, in this case, since the furnace charging time of the cold piece is longer than that of the hot piece (usually about 1 to 2 hours longer), even with steel materials rolled at the same timing, As for timing, it is necessary to insert the cold piece earlier than the hot piece. In addition, preparation time of steel materials to be charged into the heating furnace, that is, in the case of cold pieces piled up in a yard, etc., requires work time to remove from the piles, etc. It is necessary to create the schedule several hours to dozens of hours before.
[0004]
However, such future process progress prediction not only predicts the state of the steel material at the steelmaking factory, which is the upstream process, but also due to the difference in the processing speed between the heating furnaces at the hot rolling factory. Since it is not easy to predict process progress such as time differences, at present, a schedule is created by considering steel materials that have already arrived at the hot rolling mill at the start of the schedule or that will be surely arrived as soon as possible. ing. Although it is a measure that can be avoided due to concerns such as disqualification due to the occurrence of defects in the continuous casting process, it is considered that non-arrival steel materials, for example, those currently being cast in a continuous casting machine, are subject to schedules. Since this point cannot be considered as a major problem in an environment where high-speed rescheduling can be performed by an automatic scheduling function by a computer, the track time (time required from CC cutting to furnace charging) is increased here. These factors are considered to be due to the difficulty of forecasting logistics in the future. This time prediction is not a problem that can be ignored from the viewpoint of heat loss, considering that the temperature drop of the steel material in a high temperature state immediately after coming out of the CC is about 100 ° C. to 200 ° C. per hour.
[0005]
For this reason, when steel materials are actually charged into the heating furnace, particularly in the steel materials charged in the latter half of the schedule, there are not a few cases where the temperature has decreased after 10 hours or more have passed since casting. Therefore, it is an obstacle for realizing energy saving and low-cost operation in heating furnace operation.
[0006]
[Problems to be solved by the invention]
Therefore, the object of the present invention is to complete the heating furnace charging schedule from the currently determined heating furnace charging schedule, and set the charging start time of the hot piece charging furnace in the next undecided schedule to the processing speed difference between the multiple furnaces. And considering the steel materials that can be charged at the predicted time, it is possible to incorporate hot pieces (steel with a high temperature) with the shortest track time into the schedule, and to improve the energy efficiency of the heating furnace. The objective is to create an appropriate heating furnace charging / extracting schedule.
[0007]
[Means for Solving the Problems]
The present invention for achieving the above object, the distribution scheduling device for a hot rolling mill to determine the slab heating order of configured rolling mill by mill and the heating furnace of multiple heating has been finalized at the present time Uncharged steel material determination processing unit for obtaining the uncharged steel material of the furnace charging / extraction schedule, width calculation processing unit for calculating the total width of the uncharged steel materials obtained by the uncharged steel material determination processing unit, the width From the total amount of width calculated by the calculation processing unit, in order to charge them, the extracted steel material determination processing unit for obtaining the existing steel material in the heating furnace to be extracted, each of the extracted steel material determination processing unit determined The required extraction time calculation processing unit that calculates the time required to extract the steel material to be extracted from the furnace, and the schedule to be created following the fixed schedule based on the required extraction time calculated by the extraction required time calculation processing unit The first charging start time prediction unit that predicts the time that charging of steel, heat in該装input start time calculated by該装input start time predicting portion of the thermal strip multiple furnace you heat the It has a hot rolled arrival steel prediction unit that predicts the delayed arrival steel from the steelmaking factory steel casting and casting schedule, and it is determined that charging is possible based on the estimated arrival time of the hot rolled arrival steel and the subsequent steel. of steel, combined with short track time thermal piece first, by creating a schedule of thermal strips and multiple heating furnace you heat the Hiyahen by choosing subsequently cold pieces, Netsuhen charging start timing It is possible to properly predict the chargeable steel materials and incorporate heat pieces with the shortest track time into the schedule, and create an appropriate heating furnace charging / extracting schedule from the viewpoint of the energy efficiency of the heating furnace. That.
However, hot-rolled arrival steel means steel that arrives at the hot-rolling factory and can be charged.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a flow of processing for determining a steel material that can be inserted in the creation target schedule of the present invention.
First, in the heating furnace charging / extracting schedule that is being executed at the specified time (mainly the current time), charging to the heating furnace for heating strip (hereinafter referred to as “heating furnace”) is not performed. From the actual charging data and the current schedule list (= list of planned steel materials to be charged), by removing the steel materials that have been charged from the steel materials that are scheduled to be charged, Judge the unfilled steel. Subsequently, the sum total of the slab widths (noting that the coil width is not the coil width) of the unsheathed steel material that has been determined is calculated by the width summation calculation unit 2. Subsequently, in the extracted steel material determination unit 3, in order to insert the total width calculated by the total width calculation unit 2, the existing slab that has to be extracted is integrated to the corresponding total width from the extraction end. By seeking. This is shown in FIG.
[0009]
That is, if the region 11 corresponding to the total width of the uncharged steel material in the determined schedule at the designated time (mainly the current time) is shifted to the extraction end and the steel material 12 included in the region is not extracted, It can be seen that the uncharged steel material in the region 11 does not finish charging. However, in order to extract all the steel materials in the region 12, the steel materials having the largest extraction order among the steel materials included in the region must be extracted. It can be seen that the time required to extract the steel material included in the region 13 corresponding to the steel material is the time desired to be obtained here.
[0010]
Accordingly, as the subsequent processing, the processing time for every steel material included in the region 13 obtained by the extracted steel material determination unit 3 as described above (= line pitch) in the extraction time calculation unit 4 as described above. Is calculated based on empirical values from the coil length, coil width, coil thickness, material, charging temperature, extraction target temperature, etc. of each steel material. Specifically, the heating pitch obtained from the charging temperature, extraction target temperature, etc., the rolling pitch obtained from the coil thickness, coil length, etc., and the maximum winding pitch obtained from the coil thickness, width, TS, etc. Let time be the line pitch. The line pitch determined in this way is obtained for each furnace with respect to the steel materials included in the region 13, and is defined as the time required to insert the uncharged steel materials in the fixed schedule. Then, in the charging start time prediction unit 5, the time required for charging the uncharged steel material of the fixed schedule previously obtained by the extraction required time calculation unit 4 at the designated time (mainly the current time) is determined. By adding, it is possible to obtain the timing (the time when the first piece of steel is charged) into the hot piece furnace in the creation target schedule (the hot piece furnace charge start time).
[0011]
On the other hand, the steel material unloading state on the continuous casting machine side is predicted from the steel production and casting schedule of the steelmaking factory, the hot rolling arrival time of the steel material is obtained by the steel material arrival time prediction unit 6, and the insertable steel material judging unit 7 Then, the steel material that arrives at Hot Rolling at the start time of the hot piece furnace charging determined by the charging start time prediction unit 5 is determined. After that, out of the steel materials judged to be able to be charged, combine the hot pieces with short track time to create a schedule skeleton, and select the steel materials that match the width, thickness, etc. from the cold piece yard and insert them. A schedule can be created. That is, first, the steel material to be incorporated into the schedule is selected mainly in the hot strip furnace, the cold source steel material suitable for the selected steel material is subsequently selected, the schedule funding is determined, and the method such as that disclosed in JP-A-6-304619 is adopted. The order of entry and the order of extraction (= rolling order) may be determined.
[0012]
【The invention's effect】
As described above, according to the present invention, it is possible to appropriately predict the heating piece charging start timing and the steel material that can be charged, and to incorporate a heating piece with a track time as short as possible into the schedule, and to improve the energy efficiency of the heating furnace. Therefore, it is extremely useful in that it can create an appropriate heating furnace charging / extracting schedule, and provides essential performance to operate the heating furnace at low energy and cost.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a process for obtaining a steel material that can be inserted into a hot strip furnace in a hot rolling mill according to the present invention.
FIG. 2 is a diagram illustrating processing contents of an extracted steel material determination unit according to the present invention.
[Explanation of symbols]
1: Uncharged steel material determination unit 2: Total width calculation unit 3: Extracted steel material determination unit 4: Extraction required time calculation unit 5: Charging start time prediction unit 6: Steel material arrival time prediction unit 7: Insertable steel material determination unit 11: Area corresponding to the total width of the uncharged steel material 12: Extraction end area corresponding to the total width of the uncharged steel material 13: Extraction required area

Claims (2)

In distribution scheduling device for a hot rolling mill to determine the slab heating order of configured rolling mill by the heating furnace of multiple mill, a non-charging steel heating RoSoIri and extraction schedule has been finalized at the present time From the uncalculated steel material determination processing unit to be calculated, the width calculation processing unit to calculate the sum of the widths of the uncharged steel material determined by the uncharged steel material determination processing unit, and the total amount of width calculated by the width calculation processing unit, In order to charge them, the extraction steel material determination processing unit for obtaining the existing steel material in the heating furnace to be extracted, the time required for extraction of the steel material to be extracted from each furnace determined by the extracted steel material determination processing unit extracting required time calculation processing unit for calculating, top than extractant required time calculated from the extraction time required calculation processing unit, the multiple heating furnace you heat the thermal strip is being created schedule followed definite schedule Predicting the time at which the steel material is charged, a charging start time predicting unit, and predicting the hot rolled arrival steel material at the charging start time calculated by the charging start time predicting unit from the steelmaking and casting schedule of the steel mill A hot-rolled arrival steel material prediction unit, and based on the estimated arrival time of the hot-rolled arrival steel material and the subsequent steel materials, first, a hot piece having a short track time is combined with the steel material that is determined to be able to be charged. hot rolling mill of the heating scheduling apparatus characterized by scheduling a thermal strip and multiple heating furnace you heat the Hiyahen by choosing subsequently pieces.
However, hot-rolled arrival steel means steel that arrives at the hot-rolling factory and can be charged. In distribution scheduling method of hot rolling mill to determine the slab heating order of configured rolling mill by mill and the heating furnace of multiple, non charging steel heating RoSoIri and extraction schedule has been finalized at the present time A procedure for obtaining, a procedure for obtaining the sum of the widths of the uncharged steel materials, and a procedure for obtaining the already loaded steel materials in the heating furnace to be extracted in order to charge them from the calculated total amount of widths; The extraction time calculation procedure for calculating the time required to extract the steel material to be extracted from each furnace calculated in this way, and the heat of the creation schedule following the fixed schedule from the extraction time calculated in the previous extraction time calculation first a step of predicting a time to charging steel, where the calculated hot-rolled arrival steel the steel out of the steel mill in charging start time of the multiple furnace you heat the strip, casting schedule And a procedure for predicting the hot-rolled arrival steel material predicted from the steel, and among the steel materials determined to be chargeable based on the estimated arrival time of the hot-rolled arrival steel material and the subsequent steel materials, combining pieces, thermal strips and heating scheduling method of hot rolling mills, characterized in that the scheduling a heating furnace multiple you heated Hiyahen by selecting by selecting subsequently cold strip.
However, hot-rolled arrival steel means steel that arrives at the hot-rolling factory and can be charged.

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