WO2013011544A1 - 熱間板材製造設備及び熱間板材製造方法 - Google Patents
熱間板材製造設備及び熱間板材製造方法 Download PDFInfo
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- WO2013011544A1 WO2013011544A1 PCT/JP2011/066229 JP2011066229W WO2013011544A1 WO 2013011544 A1 WO2013011544 A1 WO 2013011544A1 JP 2011066229 W JP2011066229 W JP 2011066229W WO 2013011544 A1 WO2013011544 A1 WO 2013011544A1
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- slab
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/14—Plants for continuous casting
- B22D11/142—Plants for continuous casting for curved casting
Definitions
- the present invention relates to a hot plate material manufacturing facility and a hot plate material manufacturing method suitable for increasing the production amount of a thin plate material without reducing the surface quality.
- Non-Patent Document 1 introduces a new hot rolling facility for so-called semi-endless rolling using a long slab. According to this, a long thin slab having a thickness of about 70 mm is directly fed and rolled after continuous casting, thereby reducing the number of rolling of the unstable plate tip and tail, and as a result, it is possible to produce an ultrathin material. It is described that it becomes.
- Non-Patent Document 1 describes that the continuous casting machine has a casting speed of 6 m / min and the annual production is 1.3 million tons. And in FIG. 7, there is a study in the case of two strands, and a necessary mechanical crown amount is studied by a combination of semi-endless rolling and batch rolling.
- Patent Document 1 two strands of continuous casting machines are arranged in FIG. 25, and the cast slab is transported to a heating furnace installed in the mill line on the continuous casting machine exit side and before rolling on the exit side of the heating furnace. A method of joining a slab and rolling a plurality of slabs continuously is shown. And the slab stored in the soaking furnace of each strand is one, and the slab is traversed to the heating furnace.
- Patent Document 2 a continuous casting machine has two strands and a rolling facility has one line.
- the equipment of Patent Document 2 has a space of a length corresponding to a plurality of slab lengths when transporting on the entry side of the table, and producing a continuous casting stably at a constant speed. It has been devised so that the thin slab can be supplied to the rolling equipment.
- FIG. 1 shows an example in which a rough bar rolled to an arbitrary thickness by a roughing mill is wound by a coil box in front of a joining device.
- the coil box has a function of adjusting the timing of unwinding the coarse bar as the succeeding material in accordance with the timing of joining with the preceding material and keeping the coarse bar in standby.
- the limit of casting speed is about 6 m / min.
- rolling equipment is required to perform rolling within a desired temperature range of the rolled material. This is because if the temperature of the rolled material is lowered, a desired material cannot be obtained, and the deformation resistance of the rolled material is increased to increase the load acting on the rolling mill. Therefore, the rolling speed is 2 to 3 times the casting speed on the entry side of the rolling equipment.
- Non-Patent Document 1 in the case of a continuous casting machine 1 strand, even if the continuous casting machine is fully operated, there is a time when the rolling equipment is not rolled, The production capacity of the rolling equipment has not been fully utilized.
- the strand that is not on the line extension line of the rolling equipment will produce a slab having a short slab length corresponding to at least one coil. Since batch rolling is performed for each short slab, the number of times of rolling of the unstable plate tip and tail ends increases, and there has been a problem that the chance of occurrence of rolling trouble increases. In particular, rolling of a thin plate material is likely to cause these rolling troubles, which limits the production of the thin plate material. That is, an increase in the production amount of the thin plate material is suppressed.
- the soaking furnace has only a part for traversing the slab to the heating furnace, so that the slab cast from the continuous casting machine is also traversed. Since supply continues, in order to avoid the interference of these slabs during traversal, it is necessary to take measures such as extremely reducing the casting speed during traversal. In particular, in continuous casting of thin slabs with a thickness of about 70 mm, changing the casting speed significantly on the way would be avoided as much as possible on the operation side because the casting conditions become unstable, but unavoidably changing the speed during casting. Will be.
- Non-Patent Document 2 in which an example in which the coarse bar is wound by the coil box in front of the joining device is disclosed, when the coil box winds the coarse bar, friction between the plates causes the coarse bar to be wound. Since the surface flaws and the like are generated, it is already known in Patent Document 4 that the surface quality of the steel strip is affected when applied to a surface flaw strict material. There was a problem that endless rolling of materials that could not be obtained was impossible.
- the present invention has been proposed in view of such circumstances, and the object thereof is to provide a hot plate material manufacturing facility and a hot plate material manufacturing method capable of increasing the production amount of a thin plate material by enabling endless rolling with a plurality of strands. Is to provide.
- the hot plate material manufacturing equipment for solving the above problems is as follows.
- a pre-mill furnace disposed on the line extension of the rolling equipment on the entry side of the rolling equipment and having a length equal to or longer than the slab length corresponding to at least one coil;
- a transfer furnace that is disposed on the entry side of the pre-mill furnace and capable of transferring the slab to the pre-mill furnace;
- a plurality of slab production lines arranged on the entry side of the transfer furnace;
- a bonding machine disposed on the exit side of the pre-mill furnace;
- a continuous casting machine outlet furnace disposed at the entrance side of the transfer furnace of at least one line of the slab production line and having a length equal to or more than a slab length corresponding to a plurality of coils;
- a continuous casting machine disposed on the inlet side of the continuous casting machine outlet furnace; It is provided with.
- At least one line of the slab production line is characterized in that a rolling mill is disposed on the entry side of the transfer furnace and a heating furnace is disposed on the entry side of the rolling mill.
- the one continuous caster and the continuous caster outlet furnace on the outlet side thereof are arranged on a line extension line of the rolling equipment.
- the rolling equipment includes a plurality of rolling stands, and the joining machine is disposed between an initial rolling stand of the plurality of rolling stands and the pre-mill furnace.
- the rolling equipment includes a roughing mill and a finishing mill, and the joining machine is disposed between the roughing mill and the finishing mill.
- a shear is installed on the exit side of the joining machine.
- a joining machine is disposed on the exit side of the furnace before the mill, a rough rolling machine is disposed on the exit side of the joining machine, a finishing mill is disposed on the exit side of the roughing mill, and the roughing mill and finish rolling It is characterized by installing a shear between the machine.
- the distance between the first rolling stand of the plurality of rolling stands and the pre-mill furnace is 30 m or less.
- a method for producing a hot plate material is as follows.
- a slab produced by at least one line provided with a continuous casting machine of a plurality of slab production lines and a continuous casting machine outlet furnace having a length equal to or longer than the slab length corresponding to a plurality of coils is passed through a transfer furnace.
- the slab transported to the pre-mill furnace is joined by a joining machine on the exit side of the pre-mill furnace so that a plurality of slabs can be continuously rolled.
- a slab thicker than the slabs of other slab production lines is extracted from the heating furnace.
- the slab rolled at least once by the rolling mill is supplied to the pre-mill furnace through the transfer furnace.
- At least a continuous casting machine outlet side furnace having a length equal to or longer than a slab length corresponding to a plurality of coils is arranged on the inlet side of the transfer furnace, and a continuous casting machine is arranged on the inlet side of the continuous casting machine outlet side furnace.
- the slab is supplied from the plurality of continuous casting machines to the pre-mill furnace through the continuous casting machine outlet furnace and the transfer furnace.
- the slab is made to be capable of both rolling the long slab by direct feeding and rolling while joining the short slabs or the short slab and the long slab on the exit side of the pre-mill furnace.
- rolling is performed in a state where a plurality of short slabs and long slabs are connected.
- a shear is disposed between the joining machine and a rolling stand on the outlet side of the joining machine, and when a joining failure occurs, the rolled material is divided between the joining failure portion and the rolling stand.
- slabs produced in a plurality of slab production lines are transported to a pre-mill furnace via a transport furnace, and on the exit side of the pre-mill furnace. Endless rolling of multiple slabs has been made possible by joining with the arranged joining machine, so that the production capacity of thin sheet materials can be increased without fully reducing the surface quality and making full use of the production capacity of the rolling equipment. Can do.
- FIG. 2 is a detailed view of part A in FIG. 1. It is a figure equivalent to the A section of Drawing 1 showing Example 2 of the present invention. It is a principal part side view of the hot plate material manufacturing equipment which shows Example 3 of this invention. It is a principal part side view of the hot plate material manufacturing equipment which shows Example 4 of this invention. It is a principal part top view which shows Example 5 of this invention. It is a principal part top view which shows Example 6 of this invention. It is a principal part top view which shows Example 7 of this invention. It is a 1st action
- FIG. 1 is a schematic side view of a hot plate material manufacturing facility showing Embodiment 1 of the present invention
- FIG. 2 is a plan view of the main part of FIG. 1
- FIG. 3 is a detailed view of part A of FIG.
- molten steel is poured from a ladle 10 to a tundish 11 and from the tundish 11 to a slab continuous casting machine (continuous casting machine) 12.
- the molten steel is solidified to form a high-temperature slab W.
- the slab W proceeds to the continuous casting machine delivery furnace (continuous casting machine delivery furnace) 14, and the continuous casting machine delivery furnace 14 suppresses the temperature drop of the slab W and makes the temperature distribution in the slab W uniform.
- the exit side shear 13A of the slab continuous casting machine 12 cuts when the slab W reaches a desired length.
- the slab continuous casting machine 12 includes a first slab continuous casting machine 12a and a second slab continuous casting machine 12b, and each outlet has a length longer than the slab length corresponding to a plurality of coils.
- a first continuous casting machine outlet side furnace 14a and a second continuous casting machine outlet side furnace 14b are installed.
- a slab Wa having a long slab length corresponding to a plurality of coils is produced in the first continuous caster outlet furnace 14a, and a slab corresponding to one coil in the second continuous caster outlet furnace 14b.
- a short slab Wb is produced.
- a transfer furnace 15 is provided on the exit side of the continuous casting machine exit side furnace 14.
- the transfer furnace 15 is also provided with a first transfer furnace 15a and a second transfer furnace 15b corresponding to the first continuous caster delivery side furnace 14a and the second continuous caster delivery side furnace 14b, and the short slab Wb is second transported. It is transported to the mill line by the furnace 15b (see the arrow in FIG. 2), and then transported to the pre-mill furnace 16.
- the short slab Wb in the pre-mill furnace 16 follows the rear end of the preceding material being rolled, completes the catch-up before being joined by the joining machine 17, and is then joined.
- the sheet is rolled by a roughing mill 18 and rolled by a finishing mill 19 to be rolled into a strip S having a desired thickness, and then the cooling device 20 ⁇ pre-shear pinch roller 21 ⁇ shear 13B. ⁇ Then it is wound up by a carousel coiler 23 through a pinch roller 22 before the coiler. That is, while being wound by the carousel coiler 23, it is wound one coil at a time while being cut by the shear 13B.
- the coiler is not limited to the carousel coiler 23, and a plurality of downcoilers generally used in hot rolling can be used.
- an intermediate cooling device is provided to roll both the austenite region and the ferrite region. It is also possible to cope with this.
- the short slab Wb has a length corresponding to one coil at the shortest, but if it is possible in terms of equipment, it may be a length that can pass through the transfer furnace 15 such as two coils or three coils. .
- Patent Document 3 various devices described in Patent Document 3, Non-Patent Document 2, and Patent Document 5 are arranged around the bonding machine 17. That is, as described in Patent Literature 3 and Non-Patent Literature 2, the joining machine 17 is configured to complete joining while overlapping and shearing the rear end of the preceding material and the front end of the following material. The joining time of the joining machine 17 is extremely short, and the joining machine 17 itself is a pendulum type joining machine fixed to the foundation.
- the pre-joining descaling device 33 removes the oxide scale from the surface of the slab W that has exited the pre-mill furnace 16 so as to minimize the oxide scale on the surface that has been superposed before joining.
- the overlapping device 34 lowers the rear end of the preceding material so that the front end of the following material overlaps the rear end of the preceding material.
- a crop removing device 35 is installed on the exit side of the joining machine 17 so as to remove crops generated during joining.
- the operation of the crop removal device 35 is the same as that described in Patent Document 5.
- 30 is a slab cutting machine
- 31 is a side guide
- 32 is a pinch roll
- 36 is a descaling device before rough rolling.
- the present invention does not limit the joining method, and any method that can join in a short time may be used.
- FIG. 4 is a view corresponding to part A of FIG. 1 showing Embodiment 2 of the present invention.
- a shear 13C is installed between the joining machine 17 and the roughing mill 18.
- the other configuration is the same as that of the first embodiment, and a duplicate description is omitted.
- the shear 13C is divided when it is desired to sever the slab W halfway. According to this, when the rolling roll is wrinkled during rolling and it is desired to replace the roll, the portion that has been rolled up to that point is rolled and cut up to completion by cutting the slab W in the middle, and then the roll is replaced. Etc. can be performed.
- this shear 13C is effective when a joint failure occurs and it is desired to sever immediately after joining. If the shear 13C is not divided, the line may be stopped in the rolled state. When the line is stopped in the rolled state, it is necessary to replace many rolls during rolling, and thus it may take time to prepare for resuming rolling. After dividing by the shear 13C, the slab W remaining upstream can be retracted in the direction of the pre-mill 16 to prepare for the next rolling.
- the slab cutting machine 30 installed on the exit side of the pre-mill furnace 16 is used for processing while cutting a member that has become low temperature due to rolling trouble.
- the temperature drop of the slab W increases.
- the slab traveling speed before the rough rolling is relatively low at 10 to 30 m / min. Therefore, when the distance L from the pre-mill furnace 16 to the first rolling stand is 30 m, 1 to 3 min is required.
- the temperature drops at about 0.5 ° C./s, so the temperature drops to about 30 to 90 ° C. If this temperature drop is about this level, the rolling temperature can be secured. .
- the temperature drop becomes large it is necessary to consider such as increasing the temperature in the upstream furnace including the pre-mill furnace 16, which leads to a problem of increased energy consumption.
- the tip of the slab W exiting the pre-mill furnace 16 is transported quickly and lowered to the rolling speed before the mill, the rolling temperature of the slab W changes in the traveling direction, and the rolling conditions change. Therefore, rolling becomes difficult. Therefore, the speed when the slab W exits the pre-mill furnace 16 is almost the speed during rolling.
- the temperature drop is particularly large at the tip of the slab W. Therefore, when the temperature of the tip of the slab W exiting the pre-mill furnace 16 is low, the slab is slabed by the shear 13C on the entry side of the roughing mill 18 before rolling. It is also possible to cut the tip.
- FIG. 5 is a side view of an essential part of a hot plate manufacturing facility showing Example 3 of the present invention.
- the joining machine 17 is disposed between the roughing mill 18 and the finishing mill 19. Also in this case, the shear 13D is installed between the joining machine 17 and the first rolling stand of the finishing mill 19. Since other configurations are the same as those of the second embodiment, the duplicate description is omitted.
- the joining device 17 may become large on the entry side of the roughing mill 18. Therefore, this is an example in which joining is performed at the thickness after rough rolling.
- the thickness of the slab W that can be rolled into the desired plate thickness by rolling the rough rolling mill 18 in one direction is adopted in the present invention.
- the thickness of the slab W exceeds 100 mm, 1 to 3 rough rolling mills 18 are required.
- the thickness of the slab W is about 70 mm, it can be joined in front of the roughing mill 18 as in Examples 1 and 2, or after being rolled in the roughing mill 18 as in this embodiment. Is also possible.
- Non-Patent Document 2 a rough bar is wound up in a coil box after rough rolling.
- the temperature of the coarse bar is prevented by winding, and the joining timing is adjusted.
- the trailing slab is retained in the pre-mill furnace 16 so as to adjust the timing of heat insulation and joining, so that a coil box is not required and a plurality of slabs W are joined.
- the length of the pre-mill furnace 16 is set such that at least one short slab Wb can be accommodated.
- the transfer furnace 15b can be moved. That is, after the rear end of the short slab Wb enters the pre-mill furnace 16, the transport furnace 15 b is traversed for transport of the next short slab Wb (see the arrow in FIG. 2).
- the time until the rear end of the short slab Wb enters the pre-mill furnace 16 and the rear end of the next short slab Wb enters the pre-mill furnace 16 corresponds to the rolling time of one slab during continuous rolling.
- FIG. 6 is a side view of an essential part of a hot plate manufacturing facility showing Example 4 of the present invention.
- the joining machine 17 is disposed between the pre-mill furnace 16 and the roughing mill 18, and the shear 13D is disposed on the entry side of the finishing mill 19.
- the other configuration is the same as that of the third embodiment, and a duplicate description is omitted.
- the strip 13 on the exit side of the shear 13D is continued to be rolled by the shear 13D in front of the finish rolling mill 19, and the rolling material on the entrance side of the shear 13D is stopped after the shear 13D is cut.
- the rolled material stopped between the pre-mill furnace 16 and the shear 13D is divided by the slab cutting machine 30 on the outlet side of the pre-mill furnace 16 and discharged from the rolling line.
- the slab W on the inlet side of the slab cutting machine 30 is Retreat and place in the pre-mill furnace 16 to prepare for the next rolling.
- the finishing mill 19 also stops the line in the rolled state. Stopping the rolled material in a rolled state is referred to as a biting state. In this biting state, the work roll of the finish rolling mill 19 is locally heated where it is in contact with the rolled material and is damaged. Therefore, it becomes necessary to exchange many work rolls. Therefore, by adopting the method of the present embodiment, at least the finishing mill 19 can avoid this biting state. In some cases, the roughing mill 18 is bitten and requires work roll replacement.
- the shear 13C functions mainly only when the bonding is defective. Although poor joints do not occur frequently in normal operations, disposing the shear 13C increases the equipment cost and also generates a maintenance cost.
- the shear 13D on the entry side of the finish rolling mill 19 can be used to cut a shape portion such as a front end of the rolled material after rough rolling, a fish tail or a tongue at the rear end. For this reason, it has two functions of dividing when a bonding failure occurs during bonding and cutting the front and rear ends of the rolled material after rough rolling in normal rolling, and can be used effectively.
- the term “unsatisfactory” refers to rolling in this state, such as when the joining conditions are not in a desired state at the time of joining in the joining machine 17 or when the crop generated at the joint at the same time as joining is not removed. A state that cannot be done.
- FIG. 7 is a plan view of the essential part showing Embodiment 5 of the present invention.
- the first transfer furnace 15a on the extension line of the mill line also turns as shown in the figure and is transferred from the second transfer furnace 15b to the first transfer furnace 15a, and then the first transfer furnace 15a is on the extension line of the mill line.
- a joining machine 17 is arranged on the exit side of the pre-mill furnace 16 and is continuously rolled by the finishing mill 19 while joining the short slab Wb.
- the finishing mill 19 has several stands (six stands in the illustrated example) with a rolling stand interval of about 6 m. When the slab thickness is thin, the rough rolling mill 18 can be eliminated in this way.
- a long slab Wa can be rolled alone, or several short slabs Wb and a long slab Wa are continuously rolled by connecting the short slab Wb to the long slab Wa. You can also
- FIG. 8 is a plan view of the essential part showing Embodiment 6 of the present invention.
- the rolling equipment has a production capacity of 2 to 3 times from the viewpoint of securing the rolling temperature.
- the rolling equipment can be the most productive equipment as a continuous casting to rolling system.
- each of the first to third slab continuous casting machines 12a to 12c produces a short slab Wb so that it can be continuously rolled while being joined on the outlet side of the pre-mill 16 furnace.
- the production amount of the slab continuous casting machine 12 can be increased, and the capacity of the finish rolling mill 19 can be utilized to the maximum extent.
- rolling while joining it is possible to reduce the number of rolling at the leading end and facilitate production of the thin plate material. It is possible to stably roll the thin plate material while avoiding a rolling trouble of the thin plate material due to the passage of the plate tip and tail ends.
- even if it is a difficult material to join, as a long slab Wa it is possible to produce a thin plate material by using the change of the running plate thickness. That is, continuous rolling is possible with many steel types, and the production rate can be ensured by increasing the rolling ratio of thin sheet materials that are difficult to produce.
- FIG. 9 is a plan view of a principal part showing Embodiment 7 of the present invention.
- the present invention also includes a system in which the slab after the thick slab Wc is rolled in the rolling line is supplied from the pre-mill furnace 16 to the rolling equipment via the third transfer furnace 15c.
- the trailing slab is retained in the pre-mill furnace 16 to adjust the timing of heat insulation and joining, so that a coil box is unnecessary and a plurality of slabs W are joined. It becomes possible to roll continuously.
- a rough bar rolled to an arbitrary thickness by a roughing mill is wound up by a coil box in front of a joining device.
- the coil box has a function of adjusting the timing of unwinding in accordance with the timing of joining with the preceding material and heat retention during standby of the coarse bar.
- Patent Document 4 generally, if a coil box is applied, it has a heat retention effect of the entire length, but the surface flaws and the like are generated on the surface due to friction between the plates when the coarse bar is wound. There is a description that, when applied to strict materials, it affected the surface quality of the steel strip. As described above, there is a material in which the surface quality cannot be obtained by winding, and such a material cannot be rolled by a coil box and then joined by endless rolling.
- the pre-mill furnace 16 of the present invention has a length equal to or longer than the slab length corresponding to at least one coil, the short slab Wb in this pre-mill furnace 16 is the preceding material being rolled. It has the same two functions as the timing adjustment for chasing the rear end and the coil box for heat insulation. And since coil
- the thickness of the slab is 70 mm, the width is 1200 mm, and the casting speed is 6 m / min.
- the long slab Wa is produced by the first slab continuous casting machine 12a, and the short slab Wb is produced by the second slab continuous casting machine 12b.
- the length of the long slab Wa is 165 m, which is a length corresponding to 5 coils.
- the length of the short slab Wb is 33 mm, which is the length of one coil.
- the weight for one coil is 21.8 tons.
- the thickness after rolling is 1.4 mm
- the length of the strip S for one coil is 1650 m
- the rolling mill exit speed is 800 m / min
- the rolling time for one coil is 2.06 min.
- the rolling time for 5 coils is 10.30 min.
- FIG. 10 shows a first operation state diagram of the slab supplied to the rolling mill, and after rolling the long slab Wa, five next short slabs Wb are joined and rolled.
- the surface A1 of the long slab Wa and the surface A2 of the next long slab Wa are connected to each other at the initial stage of production by the slab continuous casting machine 12, and the exit side shear of the slab continuous casting machine 12 shown in FIG. It is the surface divided by 13A. Since the rolling time of 5 sheets of the long slab Wa and the short slab Wb is shorter than 27.50 min, the long slab Wa and the short slab Wb can be continuously rolled without hindering the production of the slab continuous casting machine 12. Become.
- FIG. 11 shows a first operation state diagram of the slab supplied to the rolling mill, and connects the first piece of the long slab Wa and the short slab Wb so that a total of 10 coils can be rolled continuously. is there.
- the non-rolling time (idle time) until the next rolling can be increased from 3.45 min to 6.90 min. Therefore, the work roll exchange and simple maintenance of the rolling mill which are necessary in actual operation can be performed. Can be used. Increasing the number of coils for continuous rolling has the effect of producing such a long idle time.
- the short slab Wb in the first action state diagram is rolled one by one.
- the reduction schedule is taken into consideration so that the thickness after rolling with the short slab Wb is made thicker than that of the long slab Wa, and the rolling trouble at the tail end of the plate is less likely to occur.
- the thickness of the slab is 70 mm, the width is 1200 mm, and the casting speed is 6 m / Let it be min.
- Long slab Wa is produced in the first slab caster 12a
- shorter slabs Wb 1 is produced in the second slab caster 12b
- the shorter slab Wb 2 Another third slab caster 12c or the rolling line Produced in
- the length of the long slab Wa is 165 m, which is a length corresponding to 5 coils.
- the length of the short slabs Wb 1 and Wb 2 is 33 mm, which is the length of one coil.
- the weight for one coil is 21.8 tons.
- the thickness after rolling is 1.8 mm
- the length of the strip S for one coil is 1283 m
- the rolling mill exit speed is 800 m / min
- the rolling time for one coil is 1.60 min. Become.
- the rolling time for 5 coils is 8.00 min.
- FIG. 12 shows a third operational state diagram of the slab supplied to the rolling mill.
- five next short slabs Wb 1 are joined and rolled.
- five short slabs Wb 2 are rolled. Accordingly, the long slab Wa and the short slabs Wb 1 and Wb 2 can be continuously rolled without impeding the production of the slab continuous casting machine 12.
- the surface A1 of the long slab Wa and the surface A2 of the next long slab Wa are connected to each other at the initial stage of production by the slab continuous casting machine 12, and the exit side shear of the slab continuous casting machine 12 shown in FIG. It is the surface divided by 13A.
- FIG. 13 shows a fourth operational state diagram of the slab supplied to the rolling mill, which connects the first piece of the long slab Wa and the short slab Wb 1 so that a total of 10 coils can be rolled continuously. It is. As a result, the time until the next rolling can be increased from 1.17 min to 1.75 to 3.50 min. When the roll needs to be changed, the idle time of 3.50 min, 1.75 min, 1.75 min is distributed as 6 min, 0.5 min, 0.5 min, thereby rolling the idle time of 6 min. It can be used for exchanging work rolls and simple maintenance. Increasing the number of coils for continuous rolling has the effect of producing such a long idle time.
- idle time can be generated by continuous rolling, and productivity can be improved.
- FIG. 14 shows an operational state diagram of a slab supplied to a conventional rolling mill.
- the short slab Wb 1 and the short slab Wb 2 are rolled one by one.
- the time is 0.5 min.
- the pitch 27.50 min is increased to 29.50 min by 2.00 min.
- rolling must be performed at a pitch of at least 27.50 min. Therefore, if the pitch is 29.50 min, the casting speed must be reduced to 5.6 m / min. This reduces productivity to 93%.
- Non-Patent Document 2 since the plate passing speed at the tip is slower than that of a normal rolling part, it is considered that the 29.50 min is further extended. Rolling to a length lowers productivity compared to rolling several sheets continuously. Further, if it is attempted to create time for exchanging work rolls and simple maintenance of the rolling mill, it is necessary to further reduce the casting speed, so that the productivity may be further reduced.
- the hot plate material manufacturing facility and the hot plate material manufacturing method according to the present invention can increase the production amount of the rolled material by fully utilizing the production capacity of the rolling facility without lowering the surface quality. It is suitable for use in manufacturing equipment.
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Abstract
Description
圧延設備の入側の当該圧延設備のライン延長線上に配置され、少なくともコイル1本分に相当するスラブ長さ以上の長さを有するミル前炉と、
前記ミル前炉の入側に配置され、スラブをミル前炉へと搬送可能な搬送炉と、
前記搬送炉の入側に配置された複数のスラブ生産ラインと、
前記ミル前炉の出側に配置された接合機と、
前記スラブ生産ラインの少なくとも1つのラインの前記搬送炉の入側に配置され、複数コイル分に相当するスラブ長さ以上の長さを有する連続鋳造機出側炉と、
前記連続鋳造機出側炉の入側に配置された連続鋳造機と、
を備えたことを特徴とする。
前記スラブ生産ラインの少なくとも1つのラインは、前記搬送炉の入側に圧延機を配置すると共に該圧延機の入側に加熱炉を配置したことを特徴とする。
前記搬送炉の入側に複数コイル分に相当するスラブ長さ以上の長さを有する連続鋳造機出側炉を配置すると共に該連続鋳造機出側炉の入側に連続鋳造機を配置したラインを少なくとも2つ設置したことを特徴とする。
前記1つの連続鋳造機とその出側の連続鋳造機出側炉を圧延設備のライン延長線上に配置したことを特徴とする。
前記圧延設備は複数の圧延スタンドからなり、前記接合機を前記複数の圧延スタンドの最初の圧延スタンドと前記ミル前炉との間に配置したことを特徴とする。
前記圧延設備は粗圧延機と仕上圧延機とを備え、前記接合機を粗圧延機と仕上圧延機との間に配置したことを特徴とする。
前記接合機の出側にシヤーを設置したことを特徴とする。
前記ミル前炉の出側に接合機を配置し、該接合機の出側に粗圧延機を配置し、該粗圧延機の出側に仕上圧延機を配置すると共に、粗圧延機と仕上圧延機との間にシヤーを設置したことを特徴とする。
前記複数の圧延スタンドの最初の圧延スタンドと前記ミル前炉との間の距離が30m以下であることを特徴とする。
複数のスラブ生産ラインの内の連続鋳造機と複数コイル分に相当するスラブ長さ以上の長さを有する連続鋳造機出側炉を備えた少なくとも1つのラインで生産されたスラブを搬送炉を経由してミル前炉へ搬送し、該ミル前炉へと搬送されたスラブをミル前炉出側で接合機により接合して複数スラブを連続的に圧延可能にすることを特徴とする。
前記搬送炉の入側に圧延機を配置すると共に該圧延機の入側に加熱炉を配置した少なくとも1つのスラブ生産ラインにおいて、前記加熱炉から他のスラブ生産ラインのスラブより厚いスラブを抽出して前記圧延機で少なくとも1回圧延したスラブを前記搬送炉を経由してミル前炉へ供給することを特徴とする。
前記搬送炉の入側に複数コイル分に相当するスラブ長さ以上の長さを有する連続鋳造機出側炉を配置すると共に該連続鋳造機出側炉の入側に連続鋳造機を配置した少なくとも2つのラインにおいて、前記複数の連続鋳造機から前記連続鋳造機出側炉及び搬送炉を経由してミル前炉へスラブを供給することを特徴とする。
前記圧延設備のライン延長線上に1つの連続鋳造機とその出側の連続鋳造機出側炉を配置したスラブ生産ラインにおいて、該スラブ生産ラインの連続鋳造機でコイル複数本分に相当するスラブ長さの長いスラブを生産する一方、他の少なくとも1つのスラブ生産ラインにおける連続鋳造機とその出側の連続鋳造機出側炉を通過するスラブは少なくともコイル1本分に相当するスラブ長さの短いスラブとし、前記長いスラブを直送にて圧延することと、前記短いスラブ同士又は短いスラブと長いスラブをミル前炉出側で接合しつつ圧延することの両方を可能にすることを特徴とする。
前記短いスラブと長いスラブをミル前炉出側で接合しつつ圧延するときは、複数本つないだ状態の短いスラブと長いスラブがつながった状態で圧延することを特徴とする。
前記接合機と該接合機出側の圧延スタンドとの間にシヤーを配置し、接合不良が生じたときに接合不良部と前記圧延スタンドとの間で圧延材を分断することを特徴とする。
11 タンディッシュ
12 スラブ連鋳機(連続鋳造機)
12a 第1スラブ連鋳機
12b 第2スラブ連鋳機
12c 第3スラブ連鋳機
13A,13B,13C,13D シヤー
14 連鋳機出側炉
14a 第1連鋳機出側炉
14b 第2連鋳機出側炉
14c 第3連鋳機出側炉
15 搬送炉
15a 第1搬送炉
15b 第2搬送炉
15c 第3搬送炉
16 ミル前炉
17 接合機
18 粗圧延機
19 仕上圧延機
20 冷却装置
21 シヤー前ピンチローラ
22 コイラ前ピンチローラ
23 カローゼルコイラ
30 スラブ切断機
31 サイドガイド
32 ピンチロール
33 接合前デスケーリング装置
34 重ね合せ装置
35 クロップ除去装置
36 粗圧延前デスケーリング装置
40 加熱炉入側テーブル
41 加熱炉
42 加熱炉出側テーブル
43 圧延機
44 圧延機出側テーブル
W スラブ
Wa 長いスラブ
Wb 短いスラブ
Wc 厚スラブ
S ストリップ
L ミル前炉から最初の圧延スタンドまでの距離
Claims (15)
- 圧延設備の入側の当該圧延設備のライン延長線上に配置され、少なくともコイル1本分に相当するスラブ長さ以上の長さを有するミル前炉と、
前記ミル前炉の入側に配置され、スラブをミル前炉へと搬送可能な搬送炉と、
前記搬送炉の入側に配置された複数のスラブ生産ラインと、
前記ミル前炉の出側に配置された接合機と、
前記スラブ生産ラインの少なくとも1つのラインの前記搬送炉の入側に配置され、複数コイル分に相当するスラブ長さ以上の長さを有する連続鋳造機出側炉と、
前記連続鋳造機出側炉の入側に配置された連続鋳造機と、
を備えたことを特徴とする熱間板材製造設備。 - 前記スラブ生産ラインの少なくとも1つのラインは、前記搬送炉の入側に圧延機を配置すると共に該圧延機の入側に加熱炉を配置したことを特徴とする請求項1に記載の熱間板材製造設備。
- 前記搬送炉の入側に複数コイル分に相当するスラブ長さ以上の長さを有する連続鋳造機出側炉を配置すると共に該連続鋳造機出側炉の入側に連続鋳造機を配置したラインを少なくとも2つ設置したことを特徴とする請求項1に記載の熱間板材製造設備。
- 前記1つの連続鋳造機とその出側の連続鋳造機出側炉を圧延設備のライン延長線上に配置したことを特徴とする請求項3に記載の熱間板材製造設備。
- 前記圧延設備は複数の圧延スタンドからなり、前記接合機を前記複数の圧延スタンドの最初の圧延スタンドと前記ミル前炉との間に配置したことを特徴とする請求項1に記載の熱間板材製造設備。
- 前記圧延設備は粗圧延機と仕上圧延機とを備え、前記接合機を粗圧延機と仕上圧延機との間に配置したことを特徴とする請求項1に記載の熱間板材製造設備。
- 前記接合機の出側にシヤーを設置したことを特徴とする請求項1に記載の熱間板材製造設備。
- 前記ミル前炉の出側に接合機を配置し、該接合機の出側に粗圧延機を配置し、該粗圧延機の出側に仕上圧延機を配置すると共に、粗圧延機と仕上圧延機との間にシヤーを設置したことを特徴とする請求項1に記載の熱間板材製造設備。
- 前記複数の圧延スタンドの最初の圧延スタンドと前記ミル前炉との間の距離が30m以下であることを特徴とする請求項5に記載の熱間板材製造設備。
- 複数のスラブ生産ラインの内の連続鋳造機と複数コイル分に相当するスラブ長さ以上の長さを有する連続鋳造機出側炉を備えた少なくとも1つのラインで生産されたスラブを搬送炉を経由してミル前炉へ搬送し、該ミル前炉へと搬送されたスラブをミル前炉出側で接合機により接合して複数スラブを連続的に圧延可能にすることを特徴とする熱間板材製造方法。
- 前記搬送炉の入側に圧延機を配置すると共に該圧延機の入側に加熱炉を配置した少なくとも1つのスラブ生産ラインにおいて、前記加熱炉から他のスラブ生産ラインのスラブより厚いスラブを抽出して前記圧延機で少なくとも1回圧延したスラブを前記搬送炉を経由してミル前炉へ供給することを特徴とする請求項10に記載の熱間板材製造方法。
- 前記搬送炉の入側に複数コイル分に相当するスラブ長さ以上の長さを有する連続鋳造機出側炉を配置すると共に該連続鋳造機出側炉の入側に連続鋳造機を配置した少なくとも2つのラインにおいて、前記複数の連続鋳造機から前記連続鋳造機出側炉及び搬送炉を経由してミル前炉へスラブを供給することを特徴とする請求項10に記載の熱間板材製造方法。
- 前記圧延設備のライン延長線上に1つの連続鋳造機とその出側の連続鋳造機出側炉を配置したスラブ生産ラインにおいて、該スラブ生産ラインの連続鋳造機でコイル複数本分に相当するスラブ長さの長いスラブを生産する一方、他の少なくとも1つのスラブ生産ラインにおける連続鋳造機とその出側の連続鋳造機出側炉を通過するスラブは少なくともコイル1本分に相当するスラブ長さの短いスラブとし、前記長いスラブを直送にて圧延することと、前記短いスラブ同士又は短いスラブと長いスラブをミル前炉出側で接合しつつ圧延することの両方を可能にすることを特徴とする請求項12に記載の熱間板材製造方法。
- 前記短いスラブと長いスラブをミル前炉出側で接合しつつ圧延するときは、複数本つないだ状態の短いスラブと長いスラブがつながった状態で圧延することを特徴とする請求項13に記載の熱間板材製造方法。
- 前記接合機と該接合機出側の圧延スタンドとの間にシヤーを配置し、接合不良が生じたときに接合不良部と前記圧延スタンドとの間で圧延材を分断することを特徴とする請求項10に記載の熱間板材製造方法。
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