JP6549232B2 - Continuous casting rolling method and continuous casting rolling apparatus - Google Patents

Description

  The present invention relates to a continuous casting and rolling method and a continuous casting and rolling apparatus, and more particularly to an invention for preventing waste of slabs even if the process line is interrupted.

  The process of rolling cast slabs solidified by a continuous casting machine at high temperature is widely used at present because the facility cost and the operation cost are lower than conventional processes.

  That is, as shown in FIG. 1, when continuous cast-rolling apparatus 1 ′ capable of performing continuous rolling produces cast slab 2 ′ having a constant thickness with continuous caster 10 ′, the cast slab 2 ′ is rolled The product is pressed by a machine 40 'to be a rolled product and discharged.

  At this time, before the cast slab 2 'is fed to the rolling mill 40', the cast slab 2 'is heated at a predetermined rolling temperature in a heating furnace 30'.

  By the way, there is a possibility that the continuous casting and rolling process may be stopped due to a failure or the like of an apparatus configuration which is disposed after the rolling mill 40 'and performs work. Also in this case, the continuous casting machine 10 'continuously produces and discharges the cast slab 2'. The slab 2 'discharged in this manner is cut and wasted, causing a problem that it can not be produced as the rolled product.

  Therefore, there is a need for research on a continuous casting and rolling method and a continuous casting and rolling apparatus to solve the above-mentioned problems.

  An object of the present invention is to provide a continuous casting and rolling method and a continuous casting and rolling apparatus which prevent waste of slabs even if the process line is interrupted and improve the yield.

  A continuous casting and rolling method according to an embodiment of the present invention comprises: continuous casting for producing a slab with a continuous casting machine; rolling for pressing the slab with a rolling mill; and the period between the continuous casting and rolling And, depending on whether or not the process after the rolling step is interrupted, a step of separating and returning the cut piece, or a release return selection step of returning the released piece. In the release / return selection step, when the process after the rolling step is interrupted, the slab transferred from the continuous casting step is cut to separate from the main path connected from the continuous casting machine to the rolling mill. The method may include the steps of: removing the cast slab; and returning the detached cast slab to the main path when the process after the rolling stage is performed again.

  In addition, the above-mentioned cast-strip detachment stage of the continuous casting and rolling method according to one embodiment of the present invention may be a cast-cut by a length corresponding to a cast-to-cut length for producing a rolled steel sheet finally produced and discharged. And c. A cutting step for chopping, a separating step of separating at least one of the slabs cut by the length from the main path, and a stacking step of stacking the detached slabs. it can.

  In the continuous casting and rolling method according to an embodiment of the present invention, the billet detachment step is performed between the cutting step and the detachment step, and the billet cut from the billet is separated from the subsequent billet. It may further include an acceleration step of accelerating and moving up.

  Further, the cutting step of the continuous casting and rolling method according to an embodiment of the present invention may be performed after the ingot enters the heating furnace for heating the ingot.

  In addition, the above-mentioned billet detachment step of the continuous casting and rolling method according to one embodiment of the present invention can be characterized in that it is performed until all the residual molten steel in the continuous casting machine is consumed.

  Further, in the continuous casting and rolling method according to one embodiment of the present invention, the returning step of the cast strip is a returning step of returning a cast piece detached from the main path onto the main path; Heating the pieces in a furnace and transmitting to the rolling step.

  A continuous casting and rolling apparatus according to another embodiment of the present invention includes a continuous casting machine for producing a slab, and a rolling mill connected to the continuous casting machine to press down the slab to produce a rolled steel plate, A cutting machine provided between the continuous casting machine and the rolling mill for cutting the slab by a length corresponding to the length of the slab for producing a rolled steel sheet finally produced and discharged A heating furnace for heating the slab, the heating furnace being provided between the cutting machine and the rolling mill, and the slab being provided in the heating furnace and causing the cut slab to be detached from the heating furnace A transfer unit for causing the heating furnace to enter the heating furnace, wherein the heating furnace is provided in a shape in which only one side face in a direction orthogonal to the main path connecting the continuous casting machine to the rolling mill is opened. It can be done.

  The continuous casting and rolling method and the continuous casting and rolling apparatus according to the present invention has an effect that it can be produced as a rolled product without wasting a slab even if the process line is interrupted.

  As a result, the yield in the continuous casting and rolling process can be improved, and the operation can be stabilized.

It is a side view showing a conventional continuous casting and rolling mill. It is a side view showing a continuous casting and rolling apparatus of the present invention. It is a top view which shows the periphery of the heating furnace in the continuous casting rolling apparatus of this invention. It is a flowchart which shows the continuous casting rolling method of this invention. It is a flowchart which shows the detachment | restoration return selection step in the continuous casting and rolling method of this invention. It is a flowchart which shows the slab removal step in the continuous casting and rolling method of this invention. It is a flowchart which shows the slab return step in the continuous casting and rolling method of this invention.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the idea of the present invention is not limited to the presented embodiments, and a person skilled in the art who understands the idea of the present invention may have a descent through adding, changing or deleting other components within the scope of the same idea. Other embodiments within the scope of the inventive concept or the present invention can be easily proposed. However, this is also included within the scope of the present invention.

  In addition, components having the same functions within the scope of the same concept shown in the drawings of each embodiment will be described using the same reference symbols.

  The continuous casting and rolling method and the continuous casting and rolling apparatus 1 according to the present invention relate to an invention for preventing waste of the cast slab 2 even if the process line is interrupted.

  That is, since the continuous casting and rolling method and the continuous casting and rolling apparatus 1 of the present invention can be produced as a rolled product without wasting the slab 2 even if the process line is interrupted, the yield in the continuous casting and rolling process It is possible to improve and stabilize the operation.

  First, the continuous casting and rolling apparatus 1 will be described in detail, and then the continuous casting and rolling method will be described.

  FIG. 2 is a side view showing the continuous casting and rolling apparatus 1 of the present invention, and FIG. 3 is a plan view showing the periphery of the heating furnace 30 in the continuous casting and rolling apparatus 1 of the present invention.

  Referring to FIGS. 2 and 3, a continuous casting and rolling apparatus 1 according to an embodiment of the present invention is connected to a continuous casting machine 10 for producing a slab 2 and the continuous casting machine 10 to press down the slab 2. Between the continuous casting machine 10 and the rolling machine 40 to produce rolled steel sheet, and the length of the slab 2 for producing the rolled steel sheet finally produced and discharged And a heating furnace 30 provided between the cutting machine 20 and the rolling machine 40 for heating the slab 2 and the heating furnace 30. A transport unit 50 for removing the cut slab 2 from the heating furnace 30 or cutting the split slab 2 into the heating furnace 30, and the heating furnace 30 includes the continuous casting The direction perpendicular to the main path from machine 10 to rolling machine 40 It can be characterized in that only one side is provided with an open shape 30a.

  In this configuration, even if the process is interrupted by the equipment after the rolling mill 40, the cast slab 2 produced by the continuous casting machine 10 is stacked on one side without wasting, and after the equipment is properly adjusted , Sent to the rolling mill 40 so that it can be produced and discharged as a rolled product.

  Here, the continuous casting machine 10 can play a role in producing the slab 2 from molten steel through a casting process. That is, the continuous casting machine 10 supplies molten steel from the tundish to the mold, and the supplied molten steel is deprived of heat to form the cast slab 2, and the cast slab 2 is a segment roll (Segment). It can move while being guided by Roll and Pinch Roll, and can be supplied to a rolling mill 40 described later.

  However, since such a continuous casting machine 10 generates the slab 2 depending on the solidification rate of the molten steel, it is difficult to control the production rate. Therefore, in order to continuously receive the slab 2 produced by the continuous casting machine 10 and press it with a rolling mill 40 described later to produce the slab 2, there is a speed limitation.

  In particular, since the continuous casting machine 10 continuously generates the cast slab 2 until all the molten steel provided to the tundish is consumed, the molten steel may be interrupted even if the process after the rolling mill 40 is interrupted. Production of the slab 2 can not be interrupted until it is consumed.

  As a result, generally, when the process after the rolling mill 40 is interrupted, the cast slab 2 produced by the continuous casting machine 10 is cut and wasted, but in the present invention, the cutting machine 20 described later is used. The transport unit 50 and the heating furnace 30 make it possible to produce the cast slab 2 as a rolled product without wasting it.

  The rolling mill 40 can play a role of producing the slab 2 by receiving and pressing the supply of the slab 2 produced by the continuous casting machine 10. Therefore, the rolling mill 40 can be pressed while passing the billet 2 between the rolling rolls of the rolling stand provided with a pair of rolling rolls. A plurality of such rolling stands may be provided.

  Also, the rolling mill 40 may be divided into a first rolling unit and a second rolling unit depending on the position to be provided.

  Here, the first rolling unit is a rolling machine 40 provided by being connected to the rear end which is the outlet side of the continuous casting machine 10 and produces the slab 2 in cooperation with the second rolling unit. It will be.

  The second rolling section directly receives the primary-pressed slab 2 produced in the first rolling section or the slab 2 produced in the continuous casting machine 10, and thus the second-pressed final Can play a role in producing a typical slab 2.

  The heating furnace 30 can serve to provide the rolling mill 40 by raising the temperature of the cast slab 2 provided by the continuous casting machine 10 and providing the slab 2. Thus, the heating furnace 30 may be provided between the outlet side of the continuous casting machine 10 and the inlet side of the rolling mill 40.

  In particular, the heating furnace 30 has a shape in which one side surface is opened in order to separate the slab 2 cut by the cutting machine 20 described later from the main path connecting the continuous casting machine 10 and the rolling machine 40. It can be provided at 30a.

  In other words, in order to move and discharge the cut slab 2 to one side in the direction orthogonal to the main path, a part of the side wall of the heating furnace 30 is provided by the open formation 30a. Can. This is illustrated by way of example in FIG. 3, where the wall of the furnace 30 may be in the shape of an inverted "U" in cross section.

  Here, the heating furnace 30 can use induction heating as a configuration for heating. That is, the heating furnace 30 may include, for example, a coil plate, a control unit, and the like.

  The coil plate is configured to be capable of performing induction heating, and the control unit is configured to adjust the heating degree of the coil plate and the like.

  Here, the coil plate may include an induction coil for heating using an induced electromotive force. If it heats using the said induction coil, the temperature which heats the said slab 2 can be adjusted now. Thus, the amount of heating can be set differently depending on the position where the heating furnace 30 is provided, and the amount of heating can also be gradually increased.

  The cutting machine 20 plays a role of cutting a part of the cast slab 2 and may be connected to a transport unit 50 described later for separating the cut cast slab 2. Here, the cutting machine 20 may be provided between the outlet side of the continuous casting machine 10 and the inlet side of the heating furnace 30.

  Here, the length of the cast slab 2 cut by the cutting machine 20 is cut by a length corresponding to the length of the cast slab 2 for producing a rolled steel sheet finally produced and discharged. Preferably provided.

  That is, when the process after the rolling mill 40 is normally performed, the cut slab 2 is returned to the main path again and manufactured as a rolled steel plate of the rolled product and discharged. In order to be discharged as a wound (coiled) product, it is preferable that one rolled steel sheet be cut into the above-mentioned length and provided.

  Furthermore, the cutting machine 20 is preferably cut after the cast slab 2 has entered the heating furnace 30. This is provided that the distance between the cutting machine 20 and the heating furnace 30 is separated by a distance corresponding to the length of the cast slab 2 for producing a rolled steel sheet finally produced and discharged. This is because there is a problem that the entire continuous casting and rolling line becomes longer than necessary.

  That is, the continuous casting and rolling line can be provided relatively short by cutting the slab 2 after entering the inside of the heating furnace 30.

  The transport unit 50 can play a role of causing the cut slab 2 to be separated from the main path or to return the detached slab 2 to the main path.

  That is, when the process after the rolling mill 40 is interrupted, the transport unit 50 separates the slab 2 cut by the cutting machine 20 from the heating furnace 30, and again the rolling mill 40 When the subsequent steps are properly performed, the separated cast slab 2 is returned to the heating furnace 30 so that a rolled product can be produced again.

  For this reason, the transport unit 50 can include a transport body, a moving member for mounting the slab, and a pusher for applying a driving force to the moving member to change the position of the slab.

  Here, the pusher may be an actuator such as a pneumatic or hydraulic cylinder or a motor. The pusher is coupled to and supported by the transport body, and is coupled to the moving member to move the moving member.

  FIG. 4 is a flow chart showing the continuous casting and rolling method of the present invention, and FIG. 5 is a flow chart showing the separation return selection step in the continuous casting and rolling method of the present invention.

  Referring to FIG. 4 and FIG. 5, the continuous casting and rolling method according to one embodiment of the present invention includes continuous casting for producing the slab 2 by the continuous casting machine 10 and rolling for pressing the slab 2 by the rolling mill 40. The slab 2 is cut and then released or released depending on whether it is performed between the continuous casting step and the rolling step and the process after the rolling step is interrupted or not And a separation return selection step of returning the slab 2, wherein the separation return selection step cuts the slab 2 transmitted from the continuous casting stage when the process after the rolling stage is interrupted. When the slab separation step of separating from the continuous casting machine 10 from the main path connected to the rolling mill 40 and the process after the rolling phase are performed again, the separated slab 2 is returned to the main path. And b) returning the slab.

  That is, according to the present invention, even if the process after the rolling stage is interrupted, the cast slab 2 produced in the continuous casting stage is laminated without waste, and after the process is properly adjusted, the above-described slab 2 presents a method that can be sent to the rolling stage to produce and discharge as rolled products.

  The continuous casting step is a step of producing the cast slab 2, and the molten steel is solidified with a mold to form the cast slab 2 and discharged. For this reason, molten steel is supplied from the tundish of the continuous casting machine 10 to the mold, and the supplied molten steel is deprived of heat and forms the slab 2. Also, the cast slab 2 is transmitted to the next stage while being guided by the segment roll and the pinch roll.

  The rolling step is a step of pressing the slab 2 to produce a steel plate product. That is, a steel plate product may be produced by receiving and pressing the supply of the slab 2 produced in the continuous casting stage, and the steel plate may be received in response to the supply of the slab 2 produced separately from the continuous casting stage. Products may be produced.

  Here, the rolling may be configured in a plurality of stages. That is, in the first rolling step of primarily pressing the ingot 2 formed thicker than the thickness of the final produced product but thinner than the ingot 2 supplied first, and in the first rolling step The cast strip 2 can be configured in a second rolling step in which secondary pressing is performed to have the thickness of the final product.

  By the way, conventionally, after such a rolling step, the operation may be interrupted due to an accident or the like. Also in this case, in the continuous casting step, there is a problem that since the slab 2 is generated until all the molten steel is consumed, the slab 2 generated is cut and wasted. The invention solves such a problem by providing a withdrawal return selection step described later.

  According to whether or not the process after the rolling step is interrupted or performed normally, the cast-off piece 2 is cut, and the continuous casting machine 10 and the rolling machine 40 are connected. It is a step of returning the cast strip 2 which is separated from the main path or separated.

  That is, when the process after the rolling step is interrupted due to an accident or the like, the cast slab 2 produced by the continuous casting machine 10 is cut, separated outside the main path, and stacked, When the process after the rolling step is properly performed, the piled slab 2 is returned to perform the process again.

  For this reason, the separation return selection step can be divided into a cast-off step and a cast-return step.

  The slab separation step cuts the slab 2 continuously produced and discharged in the continuous casting stage even if the process after the rolling stage is interrupted, and the slab is cut outside the main path It is a step of temporarily releasing the slab 2a.

  That is, in the above-mentioned billet detachment stage, the billet 2 is cut into a predetermined length using the cutting machine 20, and the cut billet 2a in the heating furnace 30 whose one side is opened is Use it to leave the above main route.

  In particular, the billet detachment step is performed until all the molten steel provided to the continuous casting machine 10 is consumed. This is generally because the weight of one coil of a rolled product is about 20 tons, and the maximum volume of molten steel provided to the ladle of the continuous casting machine 10 is about 200 tons. The single detachment phase can be performed up to 10 times.

  That is, the above-mentioned billet detachment step of the continuous casting and rolling method according to one embodiment of the present invention can be characterized in that it is performed until all the residual molten steel of the continuous casting machine 10 is consumed.

  For this reason, the above-mentioned billet detachment stage can be divided into a cutting stage, a detachment stage, a loading stage, an acceleration stage and the like. A detailed description of this will be described later with reference to FIG.

  When the step of returning the cast slab is adjusted so that the process after the rolling step is properly performed, the cast slab 2 detached from the main path is placed on the main path again in the cast slab detaching step. It is a stage of returning to produce rolled steel sheet.

  For this reason, the slab recovery stage can be divided into a recovery stage and a heating stage. A detailed description of this will be described later with reference to FIG.

  FIG. 6 is a flow chart showing a step of separating cast slabs in the continuous casting and rolling method of the present invention. Referring to this, in the continuous casting and rolling method according to one embodiment of the present invention, the above-mentioned billet detachment stage has a length corresponding to the length of the billet 2 for producing a rolled steel sheet which is finally produced and discharged. Step of cutting the slab 2 by a length, separating step of separating the at least one slab 2 cut by the length from the main path, and stacking of the separated slab 2 And may include.

  In addition, the above-mentioned billet detachment step of the continuous casting and rolling method according to one embodiment of the present invention is performed between the cutting step and the detachment step, and the billet 2 cut off is separated from the subsequent billet 2 The method may further include an acceleration step of accelerating and moving on the main path.

  In addition, the cutting step of the continuous casting and rolling method according to an embodiment of the present invention may be performed after the slab 2 enters the heating furnace 30 that heats the slab 2.

  That is, as a concrete example of the above-mentioned billet detachment stage, a cutting stage, a detachment stage, a loading stage, an acceleration stage and the like can be presented.

  The cutting step is a step of cutting the slab 2 discharged from the continuous casting machine 10 into a predetermined length. At this time, since it is preferable that the cut piece 2 to be cut is later returned to the main path again and produced and discharged as a coil which is a rolled product, the length by which the above-mentioned cut piece 2 is cut Is preferably provided in the length of a slab 2 for producing a rolled steel sheet which is finally produced and discharged.

  Therefore, in the cutting step, the cast slab 2 can be cut using the cutting machine 20.

  In particular, in the cutting step, the billet 2 can be cut at a time after the billet 2 enters the heating furnace 30. This is to provide the continuous casting and rolling line relatively short, and the detailed description thereof is as described above.

  The separating step is a step of separating the slab 2 cut in the cutting step from the main path. That is, by separating the cut slab 2 to one side on the main path connecting the continuous casting machine 10 and the rolling mill 40, the casting after the rolling step which is not normally performed is performed. It prevents the piece 2 from being provided.

  The stacking step is a step of stacking the cast slab 2 provided and released in the separation step outside the main path. That is, although one slab 2a to be cut and discharged may be used, in general, since the plurality of slabs 2a are cut and discharged, the above-described cutting is performed by storing the cut slab 2a in layers. The space in which the cast slab 2a is stored can be reduced.

  The acceleration step accelerates the moving speed of the cut slab 2a in the step to prevent the slab 2a cut in the cutting stage from colliding with the subsequent slab 2 before the separation stage. To keep away from the subsequent cast piece 2.

  For this reason, in the acceleration step, the moving speed of the cut slab 2a can be increased by increasing the rotational speed of the drive roll on the main path along which the slab 2 moves.

  FIG. 7 is a flow chart showing a step of returning cast slabs in the continuous casting and rolling method of the present invention. Referring to this, in the continuous casting and rolling method according to one embodiment of the present invention, the returning step of the cast strip is a returning step of returning the cast strip 2 separated from the main path onto the main path; And heating the slab 2 returned to the heating stage 30 in the heating furnace 30 to transmit the same to the rolling stage.

  That is, as a concrete step of the above-mentioned billet return step, it can be divided and shown to a return step and a heating step.

  The return step is a step of moving the cut slab 2a, which has been stacked outside the main path, onto the main path. In the return stage, the transport unit 50 is driven reversely to when the cast slab 2 is detached so that it can be returned onto the main path.

  In the heating step, the cut slab 2a deposited outside the main path is returned onto the main path, and the cut slab 2a is cut in the rolling step before entering the rolling step. The temperature is raised to the temperature for rolling.

  That is, the cut slab 2a that has been stacked outside is cooled, and the above heating step is performed to raise the temperature.

  Under the present circumstances, heating of the cut slab 2a can be performed by making the said heating furnace 30 return the said slab 2a and making it heat, and in order to heat up to target temperature, the said slab 2a is back and front It can be heated while being moved to

Claims (6)

The continuous casting stage which produces a slab with a continuous casting machine,
A rolling step of pressing the slab with a rolling mill;
It is performed between the continuous casting step and the rolling step, and depending on whether or not the process after the rolling step is interrupted, the slab is cut and then released, or the detached slab is recovered. Withdrawal return selection step,
Including
The withdrawal return selection step is
And a step of separating the slab transferred from the continuous casting stage when the process after the rolling stage is interrupted to cut the slab transferred from the continuous casting machine to the main path connected to the rolling mill;
A step of returning the cast slab which has been detached, when the process after the rolling stage is performed again, onto the main path;
Including
The step of returning the slab is
Returning the slab separated from the main path to the main path;
The slab returned on the main path is heated by a heating furnace and transmitted to the rolling stage, and the heating amount is set differently according to the position where the heating furnace is provided, and the heating amount is gradually increased Heating stage, and
Continuous casting rolling method, including: The step of removing the slab is
Cutting the slab by a length corresponding to the length of the slab for producing a rolled steel sheet that is finally produced and discharged;
Releasing the at least one slab cut by the length from the main path;
The continuous casting and rolling method according to claim 1 , further comprising: a stacking step of stacking the separated cast slabs. The step of removing the slab is
The continuous casting according to claim 2 , further comprising an acceleration step which is performed between the cutting step and the separating step, and accelerates and moves the cut slab on the main path so as to be separated from the subsequent slab. Rolling method. The continuous casting and rolling method according to claim 2 , wherein the cutting step is performed after the slab has entered a heating furnace that heats the slab. The slab leaving step, the residual molten steel continuous casting machine is carried out until all consumed, a continuous casting and rolling method according to claim 1. Continuous casting machine to produce slabs,
A rolling mill connected to the continuous casting machine and pressing the slab to produce a rolled steel plate;
A cutting machine provided between the continuous casting machine and the rolling mill for cutting the slab by a length corresponding to a length of a slab for producing a rolled steel sheet finally produced and discharged ,
A heating furnace provided between the cutting machine and the rolling mill for heating the slab;
A transport unit provided in the heating furnace to cause the cut slab separated from the heating furnace or to allow the detached slab to enter the heating furnace;
Including
The heating furnace is provided in a shape in which only one side face in a direction orthogonal to the main path leading from the continuous casting machine to the rolling machine is opened, and the heating furnace heats the slab by induction heating depending on the position of the furnace is provided, and set at different heating amount, and heated by increasing the heating amount gradually, continuous casting and rolling apparatus.

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