JPS6353215A - Method for controlling charging order of rolling material into heating furnace for hot rolling - Google Patents

Abstract

PURPOSE:To reduce the energy loss of heating furnace by setting charging order of steel material into a heating furnace, so as to smoothly arrange the aimed extracting temp. in charging order at the prescribed condition, in the possible range of order from narrow to wide widths by a roll shift mechanism. CONSTITUTION:In case of arranging the aimed extracting temp. as shown in the figure, at the position developing useless heating (oblique line zone), caused by large difference of temp., steel material absorbing the useless heating is charged as rolling material by the roll shift mechanism. That is, the aimed temp. difference between preceding material and the successively material in the other of charging into the heating furnace is in the prescribed range, and the aimed temp. for the steel material in this order is gradually increased or decreased. The steel material, which is out of the possible range of rolling from the narrow width to the wide width by the roll shift mechanism, is held off charging into the heating furnace. This data is stored in a held-off data memory means, and at the time of being out of the above prescribed condition, the steel material, which matches the data stored, in the above means in accordance with the prescribed inserting condition, is selected and is inserted in between the preceding material and the successive material.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for controlling the order of insertion of rolled material into a heating furnace for hot rolling in a series of processes including a continuous casting process, a heating process, and a rolling process. .

[Conventional technology]

As is well known, for the purpose of energy saving and high productivity, there is a rolling method that effectively utilizes the high sensible heat of high-temperature slabs by charging the high-temperature slabs obtained by continuous casting into a heating furnace in as short a time as possible. The so-called HCR method is practiced on an industrial scale. - The rolling speed of the rolling process is much higher than the casting speed due to the continuous casting machine, -
Slabs are conveyed from multiple continuous casting machines to the rolling process.

Conventionally, as disclosed in JP-A No. 57-70006, for example, the rolling order is determined in advance for each roll change unit, and slabs are supplied from the slab yard in accordance with this rolling order. are doing. In other words, the conventional rolling order in which the slabs are placed in the slab yard, the slabs from the slab yard are charged into the heating furnace according to the rolling order, and the slabs extracted from the heating furnace are sent to the rolling process is shown in Figure 8. As shown in the figure, rolling is carried out using a rolling schedule generally referred to as a coffin type. In other words, the initial product sheet width Q1 after changing to a new work roll is determined by rolling a material whose width is sufficiently narrower than the same length of the rolls to stabilize the sheet threadability, and then changing the maximum width Q2. After rolling, the rolling order is determined so that products with narrower widths are successively rolled, and the influence of uneven wear caused by the edge portion of the steel plate on the surface of the work roll does not appear on the product. In such a coffin-shaped rolling schedule, rolling is performed in the order of rolling from the largest rolling width to the narrowest rolling width, so the degree of freedom in setting and changing the rolling schedule is low.

By the way, it has been devised and implemented to equip a rolling mill with a roll shift mechanism as a device to prevent the effects of uneven wear from appearing on products. With this mechanism, it is possible to set the rolling order from narrow to wide within a predetermined range, so there is a high degree of freedom in setting and changing the rolling schedule. In recent years, with the aim of energy saving and high productivity, HCR effectively utilizes the high sensible heat of high-temperature slabs by charging the high-temperature slabs obtained by continuous casting into the heating furnace in as short a time as possible.
It is used as an essential element in the HDR method, which involves rolling as is without passing through a heating furnace. That is, in the HDR method, since there is no function to adjust the schedule between the continuous casting process and the hot rolling process, the castings in the continuous casting process directly become the hot rolling schedule. In addition, there is usually a difference in production capacity between the continuous casting process and the hot rolling process due to differences in technical conditions, with the continuous casting process having multiple strands of 2 to 8 strands per line in the hot rolling process. A method of casting with strands is adopted. Therefore, as shown in FIG. 9, there is not necessarily a transition from wide to narrow, but a transition from narrow to wide. By using a roll shift mechanism as a means to absorb such fluctuations, HDR and HCR methods are carried out without damaging the high sensible heat of the hot slab. With current technology, the quality and productivity of continuous casting can be stabilized through advances in various peripheral technologies, such as technology for early detection of abnormalities in operation and quality, equipment maintenance, and improvements in diagnostic systems. ,)ICR rate,)(
Although the DR rate has reached a high level, it is impossible to achieve 100%, so slabs from the slab yard are stored in the slab yard, or slabs from the slab yard are charged into the heating furnace and the steel extracted from the heating furnace is rolled. It is also necessary to process slabs other than HCR and HDR before sending them to the line. The more such treatment of the slab, the greater the heat loss due to heat dissipation and reheating of the slab.

[Problem that the invention seeks to solve]

According to the method in which the slab is once placed in the slab yard based on the coffin rolling schedule described above, and then the slab is charged from the slab yard to the heating furnace according to the rolling schedule.
By determining the rolling order of all slabs to be rolled in advance, there is an advantage that the entire rolling schedule can be checked in advance and the slabs can be heated and rolled according to this schedule. Almost all of the slabs must be kept in the slab yard at least once, and the heat loss from the slabs during this time is large. In order to prevent this, it has been proposed to use heat retaining covers, heat retaining skids, and the like. However, considerable heat loss is still unavoidable. Therefore, the maximum effect of the HCR method cannot be obtained. Furthermore, it was attempted to determine the rolling order (that is, the heating furnace charging order) using the conventional method before the entire amount of target slabs arrived at the slab yard, that is, when some slabs were still in the stage of being scheduled for casting. In this case, if the production of slabs, wire transport, etc. in the process upstream from the heating furnace goes out of schedule,
Execution of the rolling schedule had to be abandoned midway, and as a result, the unit of roll change during rolling became smaller, resulting in a worsening of the roll unit consumption due to an increase in the frequency of roll changes9 Heat retention in the heating furnace during change This results in increased loss and decreased rolling efficiency.

Even when using a rolling mill equipped with a shift roll mechanism, the rolling order of the steel material can be set with a relatively high degree of freedom, but the target extraction temperature varies depending on the rolling order, and there is energy loss due to wasted baking in the heating furnace.

That is, when rolling with the width distribution as shown in Fig. 10a, as shown in Fig. 10b, the heating furnace extraction temperature does not shift smoothly, and due to the characteristics of the continuous heating furnace, waste burnt as shown by the slope line occurs. This results in energy loss in the separation furnace.

The present invention aims to reduce energy losses in heating furnaces.

[Means for solving problems]

In order to achieve the above object, the present invention manufactures steel materials through a continuous casting process, charges the steel materials into a heating furnace in a predetermined order, and transfers the steel materials extracted from the heating furnace to a rolling process having a roll shift mechanism. During hot rolling, the charging order of steel materials is set so that the extraction target temperature is smoothly aligned under predetermined conditions in the charging order within the range where serial numbering from narrow width to wide width is possible using the two-roll shift mechanism. do. According to this,
Conventionally, for example, the target extraction temperature distribution as shown in FIG. 10b is obtained for the plate threading type shown in FIG. 10b, but in the present invention, for example, the first
The target extraction temperature distribution shown in FIG. 11b is achieved with the threaded plate shown in FIG. 1a, and wasted baking (shaded area) is reduced. In other words, the energy efficiency of the heating furnace is improved.

In a preferred embodiment of the present invention, when the target extraction temperature distributions are aligned as shown in FIG. Insert as rolled material. That is, the predetermined condition is that the target temperature difference between the preceding material and the succeeding material is within a predetermined range in the order of charging the steel material into the heating furnace, and the target temperature of the steel material in that order gradually increases or decreases, For steel materials that fall outside the range in which rolling from narrow width to wide width using the roll shift mechanism is possible, charging into the heating furnace is suspended, and the data is stored in a retention data memory means. According to the insertion determination conditions, a steel material whose data is stored in the reserved data memory means is selected and inserted between the preceding material and the succeeding material.

The predetermined insertion determining conditions include the in-furnace time when heating the preceding material to the target temperature, and the in-furnace time required to heat the steel material in the pending data memory means to the target temperature at the heating furnace temperature at that time. It is assumed that the difference is within a predetermined range.

According to this, for example, the retained steel material in the slab yard is heated and subjected to rolling in the furnace time equivalent to the furnace time determined by the target extraction temperature of the preceding material. Therefore, energy loss is reduced accordingly.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

〔Example〕

Fig. 1 shows an outline of the arrangement of equipment from the continuous casting process to the rolling process to which the present invention is applied in one embodiment, and Fig. 2 shows the arrangement of equipment corresponding to this equipment arrangement to carry out the present invention. An overview of the device configuration is shown. First, to explain the outline, a rolling product request is given to the casting/rolling general computer 51 from a manufacturing control computer (not shown). The general computer 51 has a central processing unit system mainly composed of a microprocessor, RAM, and ROM, and has additional semiconductor memory, a magnetic disk storage device, a magnetic tape storage device,
graphic display, character display,
It connects a printer and an input board, restores product requirements, sets a rolling schedule for each roll change based on this, and also sets a casting schedule, and sends the set casting schedule to the casting management computer 111. , 112, 113, . . . and the rolling schedule is input to the rolling order calculator 21. It is given to the heating management computer 31 and the rolling management computer 41. These computers 111, 112, 113. . . , 21° 31 and 41 are also connected to a central processing unit system mainly consisting of a microprocessor, RAM, and ROM, and additional semiconductor memory, magnetic disk storage, and magnetic tape storage through an interface.

graphic display, character display,
It connects a printer and an input board, and the casting management calculators 111, 112, 113゜... each set a casting schedule based on the given rolling schedule, create a zero-piece supply schedule, and run the rolling order calculator. Give to 21.

The rolling order calculator 21 creates a rolling schedule (temporary schedule) for each roll rearrangement unit based on the given rolling schedule and casting schedule, provides this to the heating computer 31 and the rolling management computer 41, and also creates a tentative schedule. Slab yard receipt and payment data (
A remaining schedule table) is also created and given to the yard management computer 22. FIG. 3 shows an overview of such schedule calculations and the reception and passing of calculation data.

The slabs cast by the continuous casting machines 11+12+13+... and transported to the slab yard 2 by freight cars are transferred to the heating furnace 3 according to the reorganization schedule set by the rolling order calculator 2.
or placed in Slab Yard 2. The slab extracted from the heating furnace is rolled in a rolling mill 4. The rolling mill 4 has a small shift roll mechanism, and as long as the rolling width is within dW, it is possible to pass the sheet from a narrow width to a wide width without particularly damaging the rolled shape.

In this embodiment, the rolling order calculator 21 executes the present invention. An outline of the main control operations related to the implementation of the present invention by the computer 21 is shown in FIG. 4, and details of the control operations are shown in FIGS. 5a to 6.

First, refer to FIG. The computer 21 receives the rolling schedule from the computer 51, and calculates a slab supply schedule approximately corresponding to the rolling schedule to the computers 111, 112, 1.
13. ..., those data are written to the magnetic disk (step 10; hereinafter, the word "step" will be omitted in parentheses). Then, the calculators 111, 11□ calculate a slab supply schedule corresponding to the amount of slabs used for the rolling schedule with the highest priority (10-1 reclassification unit).

113, . . ., a tentative schedule (synonymous with a rolling schedule) in 10-ru reclassification units is created and given to the computers 31 and 41 (12). Then the 1
When the slabs assigned to the temporary schedule of 0-ru reclassification units arrive at the heating furnace, the data is input to the computer 21, and the computer 21 sets the rolling order (14). In other words, if the slabs that arrive are in the order specified in the tentative schedule, they are set to be charged into the heating furnace, and if they are in a different order, the rolling schedule is rearranged.
The treatment of the arrived slabs (whether to place them in the slab yard 2 or to insert them into the heating furnace 3) is set according to the reorganization schedule. Even when cold pieces are requested from the heating management calculator 5 (1
5) Reorganize the rolling schedule (furnace charging schedule) (16).

The contents of provisional schedule creation are shown in FIGS. 5a to 5c. The slab supply schedule for the amount of slabs used for rolling in units of 10-1 recombination is calculated by the calculator 111°11°, 113.・
..., the calculator 21 calculates the slab data of the slab supply schedule [shipment time from the casting process (scheduled)]
, slab yard (heating furnace) arrival time (scheduled), group number, (freight car number), slab number 1, steel type (material),
Slab thickness.

[Slab width, target extraction temperature, product thickness, and product width] are written into an arrival schedule table (one memory area of RAM; also written on a magnetic disk for storage) by group (20). Then, the group with the earliest arrival time (scheduled) is designated as the first rolling group N = 1) (21), the starting rolling material is searched from within that group, and the data of the searched starting rolling material is used as the rolling order schedule. Write to the first column of the table (one memory area of RAM) (22). Then, the data on the pressure material is deleted from the arrival schedule table (one memory area of RAM) (23). Next, the slab data of the first group is sorted in the order of 1 for the lowest one for each target extraction temperature force, and 1 for the highest one, and +s for the highest one (24
). Then, compare the target temperature of 1 with the target temperature of the pressure material, and compare the slab data of the first group (excluding the pressure material) with the pressure material at the beginning in the order in which the target temperature gradually increases or the target temperature are corrected and written in a sort order table (one memory area on the RAM) in an order in which the numbers gradually decrease (25 to 28). As a result, the slabs are arranged in the manner shown in FIG. 11b. Also, check whether there is a possibility of wasted baking.29
), if there is a possibility, execute the slab insertion process (30) in the slab yard. Details of this will be explained later with reference to FIG. 5c. Next, check whether the next slab a of the first group of pressure materials satisfies the predetermined sheet passing conditions using the shift roll mechanism 33),
If not, the slabs are rearranged with the one in the immediately preceding order (34), and in step 35, the same process as steps 33 and 34 is repeated until the slab is passed through the predetermined number of slabs. Set the order that satisfies the class. If this cannot be set, the slab that is causing the bottleneck is extracted, its data is written in the residual sound schedule table, and the data is deleted from the sort order table and the arrival schedule table, and other slabs in the residual sound schedule table are When the number of board threads is satisfied, the data is written in the sort order table and deleted from the remaining schedule table (35). Then, the target is now moved to the next slab of b (36), and when the next slab is in the order table, it is checked whether it satisfies the predetermined threading conditions as before, Set an order that satisfies predetermined sheet threading types. When the first group of threaded sheets (heating furnace charging order) in the sort order table is set as described above, this is written next to the pressure material in the rolling order schedule table (38), and the data of the first group is is deleted from the arrival schedule table (39). Next, write column data i in the rolling order schedule table is updated to indicate the column in which the last slab data was written43), and group No. j
to the second group (44), and set the data for the arrangement holes of the slab data of the second group (46).
), the slab data of the second group is written on the arrangement table in order from the one with the lowest target temperature (47). Then, as in the case of the first group described above, the target temperature sequence is from slab i (the slab set at the end of the slabs of the first group) to the entire slab of the second group. over the
As for the arrangement order that gradually increases or gradually decreases (25 to 28), the array section is searched for wasted firing in which the target temperature difference between adjacent items in the arrangement order exceeds a predetermined value (29), and if it is found, step 30 is executed there. . Then, in the same way as the predetermined serial number sequential holes of the slabs in the first group other than the pressure material, the serial numbers of the slabs in the second group are set 33 to 37.
) and are written in the rolling order schedule table (38). Up to this point, with respect to the slab in column i of the rolling order schedule table, it is unclear whether or not the No. 1 slab in the second group satisfies the predetermined sheet threading requirements. column i
(the last of the first group) and column i+1 (the most advanced of the second group) are checked to see if they satisfy the predetermined serial numbers (41), and if not, the rolling order schedule table The serial numbers are rearranged within the range from the second column to the column where writing is currently completed (the end of the second group) using the same logic as in step 35 described above.
42). Then, the third group of slab data is processed in the same way as the second group. Below is the third. 4th.
...The same applies to groups, etc. When this order setting is completed for all groups in the arrival order schedule table (45), the group number of the slab at the beginning of this rolling order schedule table is written to the arrival waiting register J (48). Then, the rolling order schedule table and the remaining schedule table are stored in the yard management computer 22, and the rolling order schedule table is stored in the heating management computer 31. It is sent to the rolling management computer 41 and the general computer 51 (49).

Every time the rolling order needle n machine 21 receives a slab supply schedule equivalent to 101 reclassification units, it creates a rolling order schedule table for 101 reclassification units as described above and uses this for yard management. Calculator 22. Heating management calculator 31. It is given to the rolling management computer 41 and the general computer 51. Yard management calculation @
22 and the totalizing machine 51 are further provided with a remaining schedule table (data on slabs scheduled to be placed in the slab yard). The yard management computer 22 writes the given rolling order schedule table and remaining schedule table on a magnetic disk in the order of arrival, and sets the slab yard receiving/slab yard discharging schedule. The heating management computer 31 writes the given rolling order schedule table to a magnetic disk in the order of arrival, and sets a heating furnace operation schedule. The rolling management computer 41 also stores the given rolling order schedule table on a magnetic disk.

Write in the order of arrival and set the rolling management schedule. The general computer 51 writes the rolling order schedule table to the magnetic disk in the order of arrival, erases the slab data in the rolling order schedule table and the remaining schedule table from the product manufacturing schedule, and re-edits the remaining product manufacturing schedule.

Next, the contents of step 30 in FIG. 5a, ``processing for inserting slabs in the slab yard'', will be explained. This is done from the slab yard in order to reduce wasteful burning in the heating furnace.
A slab (cold slab) suitable for substantially absorbing wasted burnt is selected and inserted into the scheduled rolling schedule. When proceeding to this step 30, the calculator 21 calculates the rolling width w of the slab (following material) that was determined to cause wasted baking in step 26.
b and the rolling width Wa of the slab immediately before it (preceding material), among the slabs in the slab yard table (a memory area of the magnetic disk in which data of slabs in the slab yard are written). The rolling width Wx is Wa-Wx≧-dW and Wx
-Wb≧-dW, c=1.2, 3°... (satisfying the rolling input order) is searched (50). and,
It is checked in order whether they satisfy the conditions for efficiently reducing wasteful burning (51 to 60).

In this example, the predicted charging temperature Tea ('C) of the target material (C=1.2, 3...) is calculated52), and the predicted in-furnace time 1+(min) of the preceding material is calculated53). ), the furnace atmosphere temperature Ta ("C) during charging of the target material is predicted and calculated (54)
, neck degree (furnace time of the target material) tcc (minutes) is predicted and calculated using the following formula.

tcc= a 1 + a 2 H5cTdc” +
a2 HscTcc”+ a 4 HscTdc+ a
5 Hsc Note that this is the neck degree regression equation obtained by the stepwise method, and Hsc is the target material (c = 1.2
,3. ), Tdc is the target extraction temperature ('C) of the target material. a1 to a5 are coefficients,
- In a specific example, a 1 = 38.8979. a2=8.
9145/10'.

a3 = -2,1532/10', a4 = 1
7.9506/10'.

as = 9.5487.

Then, it is checked whether the absolute value of the deviation between tea and the predicted in-furnace time tH of the preceding material is within a predetermined range Tp (waste firing has an absorption effect) (56). If it is within the predetermined range Tp, the data of the target material is inserted between the preceding material and the succeeding material on the arrangement table. In other words, add the target material to the rolling order schedule (57), and from the slab yard table,
The data of the target material is deleted (58). Such checking of correctness of serial numbers and checking of effectiveness in preventing wasted firing are sequentially performed on the slabs of the slab yard table until a suitable material is found as described above.

If a suitable material does not exist, the process returns to the next step (31) without inserting the material.

The predicted charging temperature Tcc ('C) of the slab is the amount of heat released from the time of shipment to the time of arrival at the slab yard, and the amount of heat release from the time of arrival at the slab yard to the scheduled time of charging into the heating furnace. The calculation is performed based on the slab temperature (il) (total heat quantity of the slab), and the value obtained by subtracting the sum of these heat radiation amounts from the total heat quantity is converted into the slab temperature. Figure 7 shows slab thickness and extraction temperature.

The relationship between charging temperature and heating neck degree is specifically shown. In this example, the furnace atmosphere temperature was kept constant at 1250°C.

The above is the provisional schedule creation operation that the computer 21 executes when it receives a slab supply schedule equivalent to 101 recombination units from the U-building management computers 111, 112+113, . . . . Next; after creating the rolling order schedule table as described above.

Calculator 21 when the slab was actually transported.

The rolling order setting operation will be explained with reference to FIG.

- When a freight car carrying one or more slabs arrives at a predetermined position immediately in front of the heating furnace 3, the data of the slabs is input to the computer 21. When this input is received, the calculator 21 will set the rolling order (
14). In other words, by comparing the contents of the arriving young child fixed register j and the group number of the input slab data, it is determined that the arriving slab arrived on schedule (group N
o, = J) (61). If it is as scheduled, the rolling order set at that time (in the case of the first slab in a 10-1 reclassification unit, the order in the rolling order schedule table, even if it is the S3 slab after that, the rolling order set at that time) If there is no change as described below, the order of the rolling order schedule table,
If the following changes have been made by then, the data of the arriving slabs will be written in the rolling order table in the order of the rolling order table that was set up until then, and the remaining slabs will be selected from among the arriving slabs. The data in the table is written to the slab yard table (62). At the time of this writing, the shipping time (scheduled) of the slab data is updated to the actual shipping time input this time, and the slab yard arrival time (scheduled) is updated to the slab yard actual arrival time. and calculate ((i
21 inputs the data of the rolling order table and the slab yard table to the yard management calculator 22゜heating management calculator 31.
．． Send to rolling management computer 41 and general computer 51 (6
4). Then, from the rolling order schedule table and the residual schedule table, erase the data of the slab written in the rolling order table and the slab yard data written in the slab yard table, respectively.
5) Update the contents of the arrival waiting register J to the group number scheduled to arrive at the next time in the rolling order schedule table (66) - The next freight car arrives (data input of the next arriving slab) ).

The slab yard management computer 22 controls the heating of the slabs of the freight cars and the slabs of the slab yard (only when they are in the rolling order table) based on the given rolling order table and slab data of the slab yard table. Set the order of insertion into the furnace, set the order and place for receiving slabs from freight cars (those with slab yard table specifications) into the slab yard, and give them to the crane. Heating management calculation @31 is
The heating schedule for the slab currently being charged is re-edited based on the new slab data in the given rolling order table. Similarly, the rolling management computer 41 re-edits the rolling schedule to incorporate new slab data.

Now, when the slabs that arrived by freight car have a group number different from the contents of the arrival waiting register J, the situation is different from the conditions under which the rolling order schedule table was created, so the rolling order At the top of the schedule table,
The data of the slab that has arrived this time is transferred 67), and the rolling order schedule table is rearranged (68). This rearrangement (68) is the same as the above-mentioned provisional schedule creation (12), and if the test pressure material has not yet been charged into the heating furnace, execute steps 21 and subsequent steps in the same way, and When the test pressure material is being charged into the heating furnace, steps 47 to 2 are performed.
Proceed to Step 5 and execute Step 25 and subsequent steps in the same manner. In other words, the slab data remaining in the rolling order schedule table at that time is created in the same way as the tentative schedule creation (12), with the data for the slab that has arrived at the top, to optimally match the current situation. Reorganize the rolling order schedule table. and,
Steps 62 to 66 are performed as described above for the slab that has arrived this time.

In this way, while the rolling order is being set by comparing the contents of the rolling order schedule table with the data of the slabs that actually arrive, if there is a cold slab request from the heating furnace management computer 31, the rolling order will be changed. (16: Fig. 4) is executed. In this,
For the slabs in the slab yard, the slab yard insertion process (30) shown in Fig. 5c is performed in the same way, starting with the one that takes the shortest time to charge into the heating furnace from the slab yard (the one that can be easily unloaded by a crane). , the slabs satisfying the conditions up to step 56 are extracted as suitable materials, and are supplied to the heating furnace, and are subjected to the processes from step 56 onwards.

The rolling order setting control by the rolling order calculator 21 in the embodiment described above is summarized as follows.

(1) Receive the rolling schedule in 10-rule reclassification units from the general computer 51, and send it to the casting management computer 111゜112.1
13. When receiving a slab supply schedule corresponding to a 10-ru recombination unit from ..., a rolling order schedule table for a 10-ru recombination unit is created.

(2) In creating the rolling order schedule table, test pressure material is selected from the slab group that is scheduled to be supplied earliest, and subsequent slabs are selected from a range that can be passed from narrow to wide by the shift roll mechanism. Furthermore, within the range that satisfies this condition, the target extraction temperature is changed from low to high, or vice versa, as the sheet passing temperature distribution.

(3) When the rolling order is such that waste burn occurs, the rolling width distribution of the sheets is within the range where the shift roll mechanism can pass the sheets from narrow to wide, and the heating furnace absorbs the waste burn. Search the slab yard for slabs that increase energy efficiency and insert them.

(4) When the slabs written in the rolling order schedule table set in this way are actually transported, each time they are transported, it is checked whether they have arrived in the scheduled order. If the order is correct, the rolling order is set according to the order of the rolling order schedule table, the slabs are charged into the heating furnace, and the slabs scheduled to be placed in the slab yard are placed in the slab yard.

The data of the slab processed in this way is deleted from the rolling order schedule table.

If the order is not correct, rearrange the slab data remaining in the rolling order schedule table with the currently arrived slab at the top, and re-execute (2) above to re-edit the rolling order schedule table. Then, the rolling order of the arrived slab is set as described above.

(5) When the rolling order is set as in (4) above, when a cold piece request is received from the heating furnace management computer, execute (3) above to create a rolling order table and a rolling order schedule. Re-edit the table and load the appropriate material into the heating furnace.

〔Effect of the invention〕

As explained above, in the present invention, within the range where the roll shift mechanism can serially number from narrow width to wide width, the charging order of steel materials is smoothed under predetermined conditions so that the target temperature for extraction is in the charging order. Since the setting is made so that the target extraction temperature distribution is the same as that shown in FIG. 10b for the threading type shown in FIG. 10b, in the present invention, for example, the target extraction temperature distribution is as shown in FIG. 11b for the threading type shown in FIG. 11a. The target extraction temperature distribution is as shown, and wasted baking (shaded area) is reduced. In other words, the energy efficiency of the heating furnace is improved.

[Brief explanation of the drawing]

FIG. 1 implements the invention in one embodiment. It is a block diagram showing a combination of a continuous casting process and a rolling process. FIG. 2 is a block diagram showing the configuration of an apparatus for carrying out one aspect of the present invention, and shows the arrangement of computers used in the combination and their interconnection relationships. FIG. 3 is a block diagram showing an overview of the calculation operations from creating a product manufacturing schedule to setting the rolling order, which are executed by the computer shown in FIG. 2. FIG. 4 is a flowchart showing an overview of the rolling order setting operation of the rolling order calculator that implements one aspect of the present invention. Figures 5a and 5b are flowcharts showing the contents of "temporary schedule creation J (12)" shown in Figure 4. Figure 5c is a flowchart showing the "slab yard insertion process J (30)" shown in Figure 5a. FIG. 6 is a flowchart showing the contents. FIG.
) is a flowchart showing the contents of the process. FIG. 7 is a graph showing the relationship between charging temperature and heating neck degree (required furnace time) in a certain heating furnace. FIG. 8 is a plan view showing plate threading in a conventional rolling process. FIG. 9 is a plan view showing the relationship between slab shipments from the continuous casting machine and the rolling order. Fig. 10a is a plan view showing a sheet threading type in a rolling process using a roll shift mechanism, and Fig. 10b is a plan view showing wasted burnout (
FIG. FIG. 11a is a plan view showing the serial number order for reducing wasted burn, and FIG. 11b is a graph showing the wasted burn (slope area) in the serial number order. East Figure 6 Figure 7 Charging Masutomo (0C)

Claims (5)

[Claims] (1) In hot rolling, where steel products are produced in a continuous casting process, the steel products are charged into a heating furnace in a predetermined order, and the steel products extracted from the heating furnace are sent to a rolling process that has a roll shift mechanism: Roll shift mechanism The hot rolling method is characterized by setting the charging order of steel materials so that their extraction target temperatures are smoothly aligned under predetermined conditions in the charging order within the range where rolling from narrow width to wide width is possible. A method for controlling the charging order of rolled material in a heating furnace for rolling. (2) The predetermined condition is such that the target temperature difference between the preceding material and the succeeding material is within a predetermined range in the order in which the steel materials are charged into the heating furnace, and the target temperature of the steel materials in that order gradually increases or decreases. A method for controlling the charging order of rolled material for hot rolling in a heating furnace, as set forth in claim (1). (3) For steel materials that are outside the range in which rolling from narrow width to wide width by the roll shift mechanism is possible, charging into the heating furnace is suspended and the data is stored in the suspended data memory means. ) A method for controlling the charging order of rolled material in a heating furnace for hot rolling, as described in item 2. (4) When the predetermined condition is not met, the steel material whose data is stored in the reserved data memory means is selected according to the predetermined insertion determination condition, and the steel material is inserted between the preceding material and the succeeding material. The method for controlling the charging order of rolled material in a heating furnace for hot rolling, as described in item (3). (5) The predetermined insertion determination conditions include the furnace time when the preceding material is heated to the target temperature, and the time required to heat the steel material in the pending data memory means to the target temperature at the heating furnace temperature at that time. A heating furnace charging order control method for rolled material for hot rolling according to claim (4), wherein the difference from the furnace time is within a predetermined range.