JPS6353217A - Method for controlling charging order of rolling material into heating furnace for hot rolling - Google Patents

Abstract

PURPOSE:To reduce the heat radiating loss in steel material and to reduce the reheating loss by controlling charging order in a heating furnace, so as to be changeable in accordance with the prescribed order decision condition at the time of non-coinciding the carrying order of steel material with the charging order into the heating furnace after continuously casting. CONSTITUTION:When the steel materials are suitable to a rolling schedule, they are charged into the heating furnace as the rolling schedule after casting. But, when the steel material with different order arrives due to disturbance of the steel material supply against the rolling schedule, the charging order into the heating furnace for the steel material to match the rolling schedule under prescribed order condition is rearranged. And, when the steel material is suitable to the rearranged schedule, it is charged into the heating furnace, but in case of unsuitable steel material, charging is held off and for example, it is stored in the slab yard. Therefore, when the order of arrival of steel material is changed, the probability of changing in the order of arrival is increased, and the energy loss for heating radiation and reheating is reduced.

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 slab production 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 21 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, 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 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 and HDR rate have reached a high level, but 100
% is not possible, and the slabs are kept in the slab yard or
It is also necessary to process slabs other than HCR and HDR, in which slabs from the slab yard are charged into a heating furnace and the steel material extracted from the heating furnace is sent to a rolling 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 placed in the slab yard according to 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 is not obtained.Furthermore, the rolling order (i.e. If you try to determine the heating furnace charging order using the conventional method, if the production, transportation, etc. of slabs deviate from the schedule in the process upstream from the heating furnace,
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 changes.2 Heat retention in the heating furnace during change. Even when using a rolling mill equipped with a 60-wheel shift mechanism, which increases losses and reduces rolling efficiency, if the supply of cast slabs fluctuates in relation to the rolling schedule, the slabs must be temporarily held in the slab yard. , resulting in post-loss due to its heat dissipation and reheating. In other words, slabs that do not meet the rolling schedule are held in the slab yard, but
This results in heat dissipation losses and energy losses due to reheating.

The present invention aims to reduce heat dissipation loss and reheating loss of steel materials.

[Means for solving problems]

In order to achieve the above object, the present invention provides heating furnaces with predetermined divisions, such as roll change units or corresponding operation periods, based on transportation schedule data and rolling operation schedule data of steel products manufactured in a continuous casting process. Calculate the charging order in advance according to predetermined order determining conditions and write it in the memory means; When the steel material is transported from the continuous casting process, compare the steel material with the heating furnace charging order in the memory means; Transport the steel material If the order matches the heating furnace charging order in the memory means, the steel material is charged into the heating furnace; if the order does not match, the heating furnace charging order in the memory means is changed according to a predetermined order determining condition. If the steel material matches the changed heating furnace charging order, it is charged into the heating furnace; if it does not match, the charging into the heating furnace is suspended, and the data of the suspended steel material is stored in the suspended data memory means 6. ] According to this, when the supply of steel material is compatible with the rolling schedule, the steel material is charged into the heating furnace according to the rolling schedule. When the supply of steel materials is disrupted with respect to the rolling schedule and steel materials arrive out of order, the predetermined order conditions are: 1. If a coffin-type rolling order arrangement or a roll shift mechanism is used, narrow-width The reheating furnace charging order of the steel materials in the rolling schedule is reorganized so that the movement from wide to wide is within a predetermined width range, and the target temperature difference between the preceding material and the following material is within a predetermined range, and this reorganization If the steel material meets the schedule, it is charged into a heating furnace according to the reorganization rolling schedule, and if it does not meet the schedule, it is held and placed in a slab yard, for example.

Therefore, when the order of arrival changes, there is a high probability that the arriving steel materials will be charged into the heating furnace as they are, and the energy loss due to heat dissipation and reheating will be reduced accordingly. As mentioned above, even if the steel material is held in the slab yard, the rolling schedule is reorganized, so the probability that other steel materials are also held in the slab yard in conjunction with the held steel material is reduced, and the rolling schedule is Heat dissipation and reheating energy losses throughout the steel are reduced.

In a preferred embodiment of the present invention, the rolling width of the succeeding material is dW greater than the rolling width of the preceding material in order to increase the degree of freedom in reorganizing the rolling schedule and further reduce the probability that the steel material is retained in the slab yard. Using a rolling mill equipped with a shift roll mill that is capable of proper rolling in a wide range of passing order within the initial rolling schedule and subsequent reorganization schedule, the preceding materials are rolled in the order in which they are charged into the heating furnace. Wa and the rolling width wb of the succeeding material are Wa-Wb≧-dW, and the target temperature difference between the adjacent preceding material and the succeeding material is within a predetermined range, and the target temperature of the steel material in that order is It shall be a gradual increase or a gradual decrease.Furthermore, if it is out of the predetermined range, the furnace time when heating the preceding material to the target temperature and the steel material in the reserved data memory means will be brought to the target temperature at the heating furnace temperature at that time. Assuming that the difference from the furnace time required for heating is within a predetermined range and the rolling width of the steel material in the reserved data memory means is Wx, Wa-Wx≧-dW, Wx-
A steel material satisfying wb≧-dW is selected from the steel materials in the reserved data memory means, and is inserted between the preceding material and the succeeding material.

According to this, the probability of steel materials being held in the slab yard is further reduced, and the heating operation efficiency of the heating furnace is further improved.
Heat dissipation losses and reheating heat losses are further significantly reduced. That is, when rolling with a width distribution as shown in FIG. 10a by using a shift roll mechanism, for example, as shown in FIG. 10b, the heating furnace extraction temperature does not shift smoothly, resulting in continuous heating. Due to the characteristics of the furnace, wasted firing as shown by diagonal lines occurs, resulting in energy loss in the separation heat furnace, but according to the above embodiment, the order is arranged smoothly, so the probability of wasted firing is low and energy loss is small. 6. In places where a smooth order cannot be achieved, retained steel materials are inserted and the wasted energy is used to heat the retained steel materials, so energy loss is greatly reduced.

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 consisting of a microprocessor, RAM, and ROM, and an additional semi-dedicated 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 U-build schedule and performs casting management of the set U-build schedule. Calculator 14, . 112,113. ... and the rolling schedule to the rolling order calculator 21. Heating management calculator 31
and given to the rolling management computer 41. These calculators 1
11, 11°, 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,
A printer and an input board are connected, and the casting management calculators 111, 112, 113゜... each set a casting schedule based on the given rolling schedule, create a slab 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 in the continuous molding machine 11+ 12+ 1:l+... and transported to the slab yard 2 by freight cars are as follows:
According to the reorganization schedule set by the rolling order calculator 2, the slabs are directly sent to the heating furnace 3 or placed in the 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,
As long as the rolling width is within dW, threading from a narrow width to a wide width is possible without significantly 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 1111 to 112y.
113+..., 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).
1□.

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) Rolling schedule (heating 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 101 units 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., (freight car No.), Slab No. + w4 types (material)
, slab thickness.

Slab width, target extraction temperature, product thickness, and product width] are written into the arrival schedule table (one memory area of RAM; also written to the magnetic disk for time storage) by group (20); The group with the earliest arrival time (scheduled) is designated as the first drinking group (j=1) (21),
A starting material is searched from within the group, and the data of the searched starting material is written in the first column of the rolling order schedule table (one memory area of the RAM) (22). Then, data on the starting material is erased from the arrival schedule table (one memory area of RAM) (23). Next, the slab data of the first group is rearranged from 1 for the lowest target extraction temperature to km for the highest target extraction temperature (24).

Then, the target temperature of 1 is compared with the target temperature of the starting material, and the slab data of the first group (excluding the starting material) with the starting material at the beginning is sorted in the order in which the target temperature gradually increases or the target temperature gradually decreases. They are corrected in order and written to the sort order table (one memory area on the RAM) (25 to 28). This allows the first
The slabs are arranged in the manner shown in Figure 1b. Also, check whether there is a possibility of wasted cooking29).
Possibly, the slab insertion process in the slab yard (
Execute 3o). 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 after the initial pressure material satisfies a predetermined sheet passing order using the shift roll mechanism 33). If not, the slabs are rearranged with those in the immediately preceding order (34), and in step 35, steps 33 and 34 are rearranged.
The same process as above is repeated to set an order that satisfies the predetermined sheet passing order 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 threading order is satisfied, the data is written in the sorting order table and deleted from the remaining schedule table (35). Then, move the target to the next slab of b (3
6) When the next slab is in the order table, it is checked whether or not it satisfies a predetermined sheet threading order, and the order that satisfies the predetermined sheet threading order is set, in the same way as described above. When the passing order (heating furnace loading order) of the first group in the sort order table is set as described above, this is written next to the initial pressure material in the rolling order schedule table (38), and the data of the first group is It 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 written (43), group number j is updated to the second group (44), Set the data for the arrangement holes of the slab data of the 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), and as in the case of the first group described above, the arrangement of the target temperatures is as follows.
From the slab i (the slab set at the end of the slabs in the first group) to the entire 0 slabs in the second group, the arrangement order is gradually increasing or decreasing (25 to 28). The array section is searched for wasted firing when the temperature difference between adjacent ones in the arrangement order exceeds a predetermined value (29), and if found, step 3o is executed. Then, in the same way as setting the predetermined serial number order 1 for the slabs in the first group other than the initial pressure material, set the serial number order for the slabs in the second group. 33-37)
, is written in the rolling order schedule table (38). Up to this point, for the slab in column i of the rolling order schedule table, the second
Since it is unclear whether or not the No. 1 slab in the group satisfies the prescribed rolling order, column i of the rolling order schedule table
It is checked whether column i+1 (the end of the first group) and column i+1 (the tip 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 rolling 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. Rolling control calculator 41 and comprehensive calculation g! 51 (49).

Every time the rolling order calculator 21 receives a billet supply schedule corresponding to 10 units of reclassification, it creates a rolling order schedule table for 101 units of reclassification as described above and sends this to the yard management computer 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 residual 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 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 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 (preceding material) just before it, it is possible to determine which of the 13 slabs in the slab yard table (a memory area of the magnetic disk in which data on slabs in the slab yard is written). The rolling width Wx is Wa-Wx≧-dW and W
The one that satisfies x-Wb≧-dW c=1.2,3゜...(
(5o). 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 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).
, the degree of necking (time in the furnace of the target material) tcc (minutes) is predicted and calculated using the following formula.

tcc= a 1 + a2 HscTdc2+ aa
HscTcc2+ a 4 HscTdc+ a 5
Hsc Note that this is a neck degree regression equation obtained by the stepwise method, and Hsc is calculated based on the target material (c = 1.2, 3
．． ...) thickness (mm), Tdc is the target extraction temperature ("C) of the target material, a1 to a5 are coefficients, - in a specific example, a1 = 38.8979. a2 = 8. 9
145/10'.

aa = -2,1532/10', aa
=-17,9506/10'.

as = 9.5487.

Then, tCC and predicted in-furnace time of the preceding material1. It is checked (56) whether the absolute value of the deviation from Insert between the preceding material and the succeeding material on the 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. Calculation is performed based on the slab temperature (total calorific value of the slab), and the value obtained by subtracting the sum of these heat radiation amounts from the total calorific value is converted to the slab temperature. Figure 7 shows the slab thickness,
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 billet supply schedule for the 101 recombination units of the casting management computer 111, 11□.

113, . . . is a provisional schedule creation operation executed by the computer 21. Next, after creating the rolling order schedule table as described above, calculation [i21] is performed when the slab is 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). That is, by comparing the contents of the arrival schedule 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 slab 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 set immediately 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 computer 41 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 order table and the slab yard data written in the slab yard table, respectively65),
The contents of the arrival waiting register J are stored in 1 of the rolling order schedule table.
Update the group number scheduled to arrive at the next time (66
), and waits for the next freight car to arrive (there is data input 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 computer 41 re-edits the rolling schedule to incorporate new slab data.

Now, when the slabs that arrive by freight car are in a group number different from the contents of the arrival waiting register J.

Since the situation is different from the conditions under which the rolling order schedule table was created, we will move the data of the slab that arrived this time to the top of the rolling order schedule table67).
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 initial pressure material has not yet been charged into the heating furnace, step 21 and subsequent steps are executed in the same way. When the initial pressure material is being charged into the heating furnace, the process advances from step 47 to step 25, and steps 25 and subsequent steps are similarly executed. 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. Then, regarding the slab that has arrived this time, step 62 ~
66 as described above.

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 slabs in the slab yard, the slab yard insertion process (30) shown in Fig. 5C is similarly performed in order from 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! 3 construction management calculation 111t+112.
113. 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 the subsequent slabs are selected within the range that can be passed from narrow to wide by the shift roll mechanism. Furthermore, within a range that satisfies the condition, the target extraction temperature is changed from low to high, or vice versa, and the sheet passing temperature distribution is assumed to be as follows.

(3) When the rolling order causes wasted burn, the rolling width distribution is within the range where the shift roll mechanism can pass the sheet 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 εh pieces 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, a rolling order schedule table is first created according to predetermined order determining conditions in correspondence with the rolling schedule and the accompanying billet shipping schedule, and this is stored in the memory means. It compares the slabs sent to it with the data in the rolling order schedule table in the memory means to determine whether or not the slabs are conveyed as scheduled.If it is as scheduled, the rolling order is changed according to the rolling order schedule table. If the order of arrival is different, the rolling order is changed so that the slabs that arrive in a different order are directly charged into the heating furnace and the subsequent rolling order is in the predetermined order. For example, due to differences in rice feeding time due to differences in the distance between each continuous casting machine and the rolling process, differences in casting time due to differences in casting conditions, or casting problems in a certain casting machine, etc. Even if there is a deviation from the predicted arrival time of the incoming slab in the rolling process, it will be incorporated into the rolling schedule one after another from the arriving freight car, so the rolling order of the freight cars, which has already been determined using the conventional method, will be delayed. However, the probability of occurrence of an irrational situation in which the heating furnace cannot be charged until the next freight car that is earlier in the rolling order arrives is less likely to occur.

In addition, in order to avoid this risk, the charging start time is delayed by a margin, which increases the amount and residence time of high-temperature slabs in the yard, and reduces the rolling pitch to reduce the deviation from the arrival time. It is possible to avoid a decrease in rolling capacity by taking appropriate measures. In addition, with the present invention, the probability of unloading slabs into the yard is greatly reduced, and the probability of direct delivery to the heating furnace is increased.
The frequency of black radiation caused by crane handling can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a combination of a continuous casting process and a rolling process, which implements one embodiment of the present invention. 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 executed by the computer shown in FIG. 2, from creation of a product manufacturing schedule to setting of the rolling number M. FIG. 4 is a flowchart showing an overview of the rolling M setting operation of the rolling order calculator that implements the present invention in one embodiment. 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. FIG.
) is a flowchart showing the contents of the process. FIG. 7 is a graph showing the relationship between bagging temperature and heating neck degree (required furnace time) in a certain heating furnace. FIG. 8 is a plan view showing the order of sheet passing in a conventional rolling process. FIG. 9 is a plan view showing the relationship between the order of shipment of slabs from the continuous casting machine and the order of rolling. FIG. 10a shows a rolling process using a roll shift mechanism;
Fig. 10b is a graph showing wasted firing (shaded area) in the heating furnace when slabs are charged into the heating furnace in the order in which the slabs are passed. 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 in bag” (・C)

Claims (8)

[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: Steel products produced in a continuous casting process Based on the transportation schedule data and the rolling operation schedule data, the heating furnace charging order is calculated in advance for each transportation means according to predetermined order determining conditions and written in the memory means in advance; when the steel material is transported from the continuous casting process, The steel materials are compared with the heating furnace charging order of the memory means; if the conveyance order of the steel materials matches the heating furnace charging order of the memory means, the steel materials are charged into the heating furnace; if they do not match, the steel materials are charged into the heating furnace; Changing the heating furnace charging order in the memory means according to a predetermined order determining condition, and if the steel material matches the changed heating furnace charging order, it is charged into the heating furnace, and if it does not match, it is charged into the heating furnace. for hot rolling, the data of the held steel material is written in the holding data memory means, and the rolling order is sequentially determined from the data memory means for each unit in which the steel material is conveyed; A method for controlling the charging order of rolled material in a heating furnace. (2) The predetermined order determining condition is 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 order of charging a rolled material into a heating furnace for hot rolling, as set forth in claim (1). (3) When outside the predetermined range, the steel material whose data is stored in the reserved data memory means is selected in accordance with the predetermined insertion determination condition, and the steel material is inserted between the preceding material and the succeeding material. A method for controlling the charging order of rolled material in a heating furnace for hot rolling, as described in item (2). (4) The predetermined insertion determination 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. A method for controlling the charging order of rolled material in a heating furnace for hot rolling, as set forth in claim (1), wherein the difference from the time is within a predetermined range. (5) The rolling process has a shift roll mill that is capable of proper rolling in a wider threading order, with the rolling width of the succeeding material being within dW of the rolling width of the preceding material; the predetermined order determining conditions are , the rolling width Wb of the steel material to be charged into the heating furnace next is greater than the rolling width Wa of the steel material to be charged into the heating furnace first, Wa-Wb≧
-dW; A method for controlling the charging order of rolled material in a heating furnace for hot rolling, as set forth in claim (1). (6) The rolling process has a shift roll mill that is capable of proper rolling in a wider threading order with the rolling width of the succeeding material being within dW of the rolling width of the preceding material; the predetermined order determining conditions are , the rolling width Wb of the steel material to be charged into the heating furnace next is greater than the rolling width Wa of the steel material to be charged into the heating furnace first, Wa-Wb≧
-dW, and within the range that satisfies this condition, the target temperature difference between the preceding material and the succeeding material in the order of charging into the heating furnace is within a predetermined range, and the target temperature of the steel material in that order is A method for controlling the charging order of rolled material for hot rolling in a heating furnace, as set forth in claim (1). (7) When outside the predetermined range, the steel material whose data is stored in the reserved data memory means is selected in accordance with the predetermined insertion determination condition, and the steel material is inserted between the preceding material and the succeeding material. (6) A method for controlling the charging order of rolled material in a heating furnace for hot rolling, as described in item (6). (8) The predetermined insertion determination condition is that Wa-Wx≧-dW, where Wx is the rolling width of the steel material in the reserved data memory means.
and Wx-Wb≧-dW, and in addition, the time in the furnace when the preceding material is heated to the target temperature, and the time required to heat the steel material in the reserved data memory means to the target temperature at the heating furnace temperature at that time. A method for controlling the charging order of rolled materials for hot rolling in a heating furnace, as set forth in claim (7), wherein the difference from the required furnace time is within a predetermined range.