JPS6353216A - Method for controlling charging order of rolling material into heating furnace for hot rolling - Google Patents

Abstract

PURPOSE:To reduce the energy loss by finding necessary staying time in a heating furnace from the preheating temp. at charging and the aimed extracting temp., etc., for a cast slab and using the energy for useless heating in a high temp. cast slab in the heating furnace at the time of little difference between the high temp. cast slab and a low temp. cast slab. CONSTITUTION:The steel material is charged into the heating furnace through slab yard after continuously casting. In this case, in the range of ensuring suitable consecutive plate order, the aimed extracting temp. of consecusive plate order (charging order in the heating furnace) shown in figure A is changed to the order, shifting smoothly (figure B). And between (g) material and (c) material developing useless heating (oblique line zone), the cast slab having comparatively low temp. (for example, the cast slab in the slab yard), which is heated up to the aimed extracting temp. for the equal staying time in the heating furnace as (g) material is inserted. In this way, without especially any disturbance to the pitch of rolling and without development of any additional disturbance to the heating furnace, the inputting energy efficiency in the heating furnace is improved.

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, this rolling method 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 for the purpose of energy saving and high productivity. , the so-called HCR method is practiced on an industrial scale. - The rolling speed of the rolling process is much higher than the slab production speed due to continuous casting of the machine.
- Convey slabs 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 ili after changing to a new work roll is determined by rolling a material whose width is sufficiently narrower than the roll body length to stabilize the sheet threadability.
After that, after rolling the maximum width Q2, the rolling order is determined so that the products are successively moved to narrower widths and the influence of uneven wear caused by the edge of the steel plate on the work roll surface 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 HCR method and the HDR method, since there is no function of schedule adjustment 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. ,H
CR rate, )(DR rate (direct transfer) has reached a high level, but 100% is impossible.

[Problem that the invention seeks to solve]

For example, as direct shipping progresses, the high temperature in the slab yard is zero.
When the stock of slabs decreases and the arrival of high-temperature slabs is delayed due to fluctuations in the upstream process, the rolling pitch must be reduced and the arrival of the hot slabs must be waited for, which unavoidably reduces rolling efficiency. In addition, in the continuous casting process, it is desirable to continuously cast as much vJ steel as possible into one mold, with as much of the same chemical composition as possible, from the viewpoint of productivity, yield, energy saving, and other reasons. However, in the rolling process, it is not always possible to continuously roll the same composition and size, and a roughening material for the roll is often required6. In other words, castings that satisfy both the continuous casting process and the rolling process It is difficult to achieve this, and there is energy loss due to wasteful burning and heat retention in the heating furnace. For example, No. 10a
When rolling with the width distribution shown in the figure, the heating furnace extraction temperature does not shift smoothly as shown in Figure 10b.

Due to the characteristics of the continuous heating furnace, wasted burning as shown by diagonal lines occurs, resulting in energy loss in the fractional heating furnace. This wasted baking is due to the fact that the required time in the heating furnace to bring the slab to the target extraction temperature is shorter than the rolling pitch (furnace extraction pitch).

In the above-mentioned cases, the present invention secures necessary slabs from among low-temperature slabs, thereby preventing a decrease in rolling efficiency and wasted baking in the heating furnace, and further improving continuous casting process and hot rolling. The aim is to improve roll consumption and fuel consumption by making processes continuous.

[Means for solving problems]

In order to achieve the above object, the present invention provides.

Determine the required time in the heating furnace from the predicted charging temperature of the slab, target extraction temperature, slab thickness, etc., and if the difference between the high-temperature slab and low-temperature slab is small, calculate the required time in the heating furnace. The energy lost during wasted firing of high-temperature slabs is used to heat low-temperature slabs, reducing energy loss.

As is well known, if heat transfer calculations are performed in a heating furnace using the differential method or finite element method, for example, the predicted charging temperature of a certain slab is Tea ("C), and the target extraction temperature is Td.
c ('C), if the slab thickness is Hsc (mm), the in-furnace time tcc required to bake to the extraction target temperature Tdc at the atmospheric temperature Ta (''C) in the heating furnace.
(minutes) can be found. This calculation is performed by classifying into several categories within the range of Tea, Tdc, Hsc, Ta in actual operation, and the required furnace time tcc, Tcc, T
If the relationship between dc, Hgc, and Ta is found by performing multiple regression, for example, tcc= a 1 + a 2 HscTdc” +
a 3 HscTcc”+ a 4 HscTdc+
a 5 Hsc - (1) Note that this is the neck degree regression equation obtained by the stepwise method, and a1 to a
5 is a coefficient, - In a specific example, a1=38°8979
．． a 2 "8.9145/10'.

a3 = 2.1532/107. a4 = 1
7.9506/10'.

as = 9.5487.

The predicted charging temperature Tcc ('C) of the slab is calculated by calculating the amount of heat released from the time when the slab is unloaded from continuous casting to the time when it arrives at the slab yard, and the amount of heat released from the time when it arrives at the slab yard until the scheduled time when it is charged into the heating furnace. Normal slab temperature at piece time (tI! is total piece heat)
The calculation can be performed by subtracting the added value of these heat radiation amounts from the total heat amount and converting it into the slab temperature. 7th
In the figure, slab thickness.

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

For example, if the slab thickness Hsc is the same, the predicted charging temperature Tc
The required in-furnace time tcc of the slab A with a high c and a high extraction target temperature Tdc and the slab B with a low predicted charging temperature Tcc and a low extraction target temperature Tdc are almost equal.

Therefore, find the required in-furnace time tcc for all slabs,
It is now possible to find a combination of high-temperature slabs and low-temperature slabs in which the difference is less than a predetermined value (for example, 20 minutes), and even if they are charged into the same furnace, there will be no wasted burning, and the energy input of the heating furnace will be reduced. It can increase efficiency.

As shown in Figure 10a, where the plate threads are temporarily set, the first
As shown in Figure 0b, when waste burning (shaded area) occurs, there is a relatively low temperature casting between material B and material C that is baked to the target extraction temperature in the furnace time equivalent to the furnace time of material b. A slab (for example, a cold slab from a slab yard) is inserted between the C material and the d material. A relatively low-temperature slab (for example, a slab from a slab yard) is inserted between material e and material f, and is baked to the target extraction temperature in a furnace time equivalent to that of material e. Insert the cold piece), and
By inserting a relatively low-temperature slab (for example, a cold slab from a slab yard) that can be baked to the target extraction temperature in the furnace time equivalent to the furnace time of F material (for example, a cold slab from a slab yard), unnecessary firing can be avoided. disappears. However, even if you try to insert many cold pieces like this.

Mainly, it becomes impossible to secure appropriate sheet threading related to the rolling width, or a large number of slabs are required in the slab yard. Therefore, in a preferred embodiment of the present invention, the extraction target temperature changes smoothly in the order of threading (order of heating furnace charging) as shown in Figure ttb within the range where appropriate threading can be ensured. (Fig. 11a), and in this case too, there is a difference between material G and material C, which causes wasted firing (shaded area). Insert cold slabs (e.g. cold slabs from slab yard).

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 for carrying out the present invention. An overview of the configuration of the device is shown below. 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 additional semiconductor memo storage devices, a magnetic disk storage device, a magnetic tape storage device, a graphic display, a character display, a printer, and an input device via an interface. It connects the boards, restores the product requirements, sets the rolling schedule for each roll change based on this, and also sets the casting schedule, and sends the set casting schedule to the casting management computer 111.11゜+113+ . . and the rolling schedule is given to the rolling order calculation machine 21. Heating management calculator 3
1 and the rolling management computer 41. These calculators 11i, ttz? 113+..., 21°31
and 41 also microprocessor, RAM and RO
Additional semiconductor memory, magnetic disk storage, and T1m tape storage are added via interfaces to the central processing unit system based on M.

graphic display, character display,
It connects a printer and an input board, and is a 1g construction management computer 11+*i12. tt3°... sets a casting schedule based on the given rolling schedule, creates a slab supply schedule, and provides it to the rolling order calculator 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 11t12+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 is equipped with a 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 calculation ta21 executes the present invention.
It is. An outline of the main control operations related to the implementation of the present invention of the computer 21 is shown in FIG. 4, and details of the control operations are shown in FIGS. 5a to 5a.
It is shown in FIG.

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, 1131, etc., those data are written to the magnetic disk (step 10; hereinafter, the word "step" will be omitted in parentheses). Then, the calculator 111, 1 calculates a slab supply schedule corresponding to the amount of slabs used for the rolling schedule with the highest priority (10-1 reclassification unit).
12, 113, . . . , a tentative schedule (synonymous with a rolling schedule) in units of 10-1 reclassification is created and given to the computers 31 and 41 (12). Thereafter, when the slabs assigned to the provisional schedule of the 10-ru reclassification unit arrive at the heating furnace, the data is input to the calculator 21, and the calculator 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, but if they are in a different order, the rolling schedule is rearranged and the rearranged schedule is set. Accordingly, the treatment for the arrived slab (whether to place it in the slab yard 2 or to insert it into the heating furnace 3) is set. Also when cold pieces are requested from the heating management computer 5 (15), the rolling schedule (heating furnace charging schedule) is reorganized (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 No. 00 (freight car No.), Slab No., H 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 to a magnetic disk for storage) by group (20). Then, designate the group with the earliest arrival time (scheduled) as the first group (j = 1) (21)
, searches for the starting pressure material within the group, and writes the data of the searched starting pressure material in the first column of the rolling order schedule table (one memory area of RAM) (22). Then, data on the starting material is deleted from the arrival schedule table (one memory area of RAM) (23). Next, the slab data of the first group is sorted from 1 to the one with the lowest target extraction temperature to the highest one in km (24).
. Then, compare the target temperature of 1 with the target temperature of the starting material,
The first group with the original material at the beginning (excluding the original material)
The slab data is corrected and written in the order table (one memory area on the RAM) in the order in which the target temperature gradually increases or in the order in which the target temperature gradually decreases (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 baking29)
, If there is a possibility, the slab insertion process (30) in the slab yard is executed. Details of this will be explained later with reference to FIG. 5c. Next, it is checked whether or not the next slab a of the first group of raw materials satisfies the prescribed sheet threading requirements using the shift roll mechanism33). If not, the slabs are rearranged with the one in the immediately preceding order (34), and in step 35, steps 33 and 3 are
The same process as in step 4 is repeated to set the order in which the predetermined plate threads are met until the slab is finished. If this cannot be set, the slab that is causing the bottleneck is extracted, its data is written to the residual schedule table, and the data is deleted from the sort order table and the arrival schedule table, so that the other slabs in the residual 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, move the target to the next slab of b (
36) When the next slab is in the order table, it is checked whether or not it satisfies the predetermined threading types, as described above, and the order that satisfies the predetermined threading types is set. The first in the sort order table
When the group's threading type (heating furnace charging order) is set as described above, it is written next to the starting material in the rolling order schedule table (38), and the data of the first group is deleted from the arrival schedule table ( 39), Next, update the write column data i in the rolling order schedule table to indicate the column in which the last slab data was written 43), and update the group number j to the second group (44). , set the data for the arrangement holes in 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 in the predetermined serial number order setting room for the slabs in the first group other than the original material, the serial number order of the slabs in the second group is 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
It is checked whether column i+1 (the end of the first group) and column i+1 (the leading edge of the second group) satisfy the predetermined serial number order (41). If not, the serial number order is rearranged within the range from the second column of the rolling order schedule table to the column for which 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 head of this rolling order schedule table is written into 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 goods 'R machine 41 and the general computer 51 (49).

Every time the rolling order calculator 21 receives a slab supply schedule equivalent to a 10-ru reclassification unit, it creates a rolling order schedule table for a 10-ru reclassification unit as described above and sends this to the yard management calculator 22. ．． Heating management calculator 31. It is given to the rolling management computer 41 and the general computer 51. The yard management computer 22 and the overall computer 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. Heating control needle 'J5. The machine 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 writes the given rolling order schedule table to the magnetic disk in the order of arrival, and sets a 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 finished products 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.
This method selects slabs (cold slabs) suitable for preventing unnecessary burning and inserts them into the rolling order schedule. When proceeding to this step 30, the calculator 21 performs step 2.
From the rolling width wb of the slab (following material) that was determined to cause waste burning in step 6 and the rolling width Wa of the slab (preceding material) just before that.

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 of the slabs is Wa-Wx≧-dW and Wx-Wb≧- One that satisfies dW c=1.2°3,...
(satisfying the rolling input order) is searched (50). Then, it is checked in order whether or not they satisfy the conditions for efficiently reducing wasteful burning (51 to 60). In this example, the predicted charging temperature T of the target material (C=1, 2, 3...)
Calculate eC ('C)52) and calculate the predicted in-furnace time 1+(minutes) of the preceding material53).

The furnace atmosphere temperature Ta ('C) during charging of the diagonal material is predicted and calculated (54), and the neck degree (furnace time of the target material) tcc (
minute) is predicted and calculated using the above-mentioned equation (1).

tcc and the predicted in-furnace time t1 of the preceding material. ! It is checked whether the absolute value of which deviation is within a predetermined range TP (waste firing has an absorption effect) (56). Predetermined range TP
If it is within, the data of the target material is inserted between the preceding material and the succeeding material on the arrangement table. That is, the target material is added to the rolling order schedule (57), and the data of the target material is deleted from the slab yard table (58). like this,
Checking whether the serial number is correct or not and checking whether there is an effect of preventing wasted firing are performed sequentially on the slabs of the slab yard table until the suitable material is found as described above.

If a suitable material does not exist, proceed to the next step (31) without inserting it; return.

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 based on the slab temperature (3M slab total heat amount) as a base point, and the value obtained by subtracting the added value of these heat radiation amounts from the total heat amount is converted into the slab temperature.

The above is the slab supply schedule for 10 units of reclassification by the 33 construction management computer 111+112+113,...
This is a tentative schedule creation operation executed by the computer 21 when receiving the schedule from the computer 21. Next, the rolling order setting operation of calculation Jf121 when the slab is actually transported after the rolling order schedule table has been created as described above 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. With this input, an21 will be able to set the rolling order (
14). That is, 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, and even for subsequent slabs, the rolling order set at that time) If there has been no change as described below, the data of the arriving rust month will be processed in the order of the rolling order schedule table, and if there has been a change as described below, the order of the rolling order table that was set just before that change. The data is written in the rolling order table, and the data of the slabs that have arrived and are in the remaining table is written in 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. The calculator 21 then transfers the data of the rolling order table and the slab yard table to the yard management calculator 22° heating management calculator 31. It is sent to the rolling management calculation V141 and the general computer 51 (64). Then, from the rolling order schedule table and the remaining schedule table, erase the data of the slab written in the rolling class table and the slab yard data written in the slab yard table, respectively (65), and change the contents of the arrival waiting register J to the rolling order schedule. Update the table to the group number scheduled to arrive at the next time (66),
Wait for the next freight car to arrive (data entry for 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. The heating management calculator 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 calculation fi41 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).

If the initial pressure material has not yet been charged into the heating furnace, execute Step 21 and subsequent steps in the same manner, and if the test pressure material has already been charged into the heating furnace, proceed from Step 47 to Step 25 and perform Step 25. 25 and below are executed in the same manner. That is,
At that time, create a temporary schedule (12) using the S3 piece data remaining in the rolling order schedule table with the data for the slab that arrived this time at the top, and create a rolling order that best suits the current situation. Reorganize the appointment table. Then, 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 units of 10 units from the general computer 51, and send it to the casting management computer 111゜112.1
13. When receiving a billet supply schedule equivalent to 10-ru recombination units from ..., a rolling order schedule table for 10-1 recombination units is created.

(2) When creating the rolling order schedule table, the starting 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. For sheet passing, (1) rolling width distribution, and furthermore, within a range that satisfies the conditions, the target extraction temperature shall change from low to high, or vice versa, and the sheet passing order temperature distribution shall occur.

(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.

(1) 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; also when there is a request for cold pieces from the heating furnace management computer, execute (3) above to create the rolling order table and rolling order. Re-edit the schedule table and load the appropriate materials into the heating furnace.

〔Effect of the invention〕

As explained above, in the present invention, when a slab is wasted in the heating furnace, a cold piece is inserted to absorb the wasted burn, and the cold piece is kept in the furnace for a period equivalent to the time in the furnace of the preceding material. Furnace time, so the rolling pitch is not particularly disturbed, and there is no additional disturbance in the heating furnace (
For example, there is no possibility of insufficient heating of the steel material due to insertion of cold pieces or occurrence of other wasteful burning. The input energy efficiency of the heating furnace is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a combination of a continuous manufacturing process and a rolling process, which implements the present invention in one embodiment. 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. 5a and 5b are flowcharts showing the contents of "temporary schedule creation J (12)" shown in FIG. 4. FIG. 5c is a flowchart showing the "slab yard insertion process J (30)" shown in FIG. 5a. FIG. 6 is a flowchart showing the contents of "Rolling order setting J (14)" shown in FIG. 4. FIG. (Required Furnace Time) FIG. 8 is a plan view showing plate passing in the conventional rolling process. FIG. Fig. 10a is a plan view showing the plate passing in the rolling process using the roll shift mechanism, and Fig. 1Qb is a plan view showing the plate passing in the rolling process using the plate passing. wasted heating in the heating furnace when charging (
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 6th figure Voice 7th figure Keiiri Ontomo (0C)

Claims (1)

[Claims] In hot rolling, where steel materials are produced in a continuous casting process, the steel materials are charged into a heating furnace in a predetermined order, and the steel materials extracted from the heating furnace are sent to a rolling process: Charged into the heating furnace. When heating the preceding material to the target temperature, when the arrival time of the high-temperature succeeding material at the slab yard is delayed, when the succeeding material is inappropriate due to rolling constraints, or when the preceding material is heated to the target temperature. Select the steel material in the slab yard for which the difference between the in-furnace time and the in-furnace time required to heat the steel material in the slab yard to the target temperature at the heating furnace temperature at that time is within a predetermined range, and select the steel material in the slab yard. A method for controlling the order of charging a rolled material into a heating furnace for hot rolling, characterized in that the material is inserted into the heating furnace after the preceding material.