JP6511977B2 - Twin-roll vertical casting apparatus and twin-roll vertical casting method - Google Patents

Description

  The present invention relates to a twin roll vertical casting apparatus and a twin roll vertical casting method.

  In twin-drum continuous casting for casting steel plates, molten steel is injected into a reservoir formed by a pair of cooling drums with parallel axes and rotating in opposite directions and a side weir, and the molten steel is cooled by the circumferential surface of this cooling drum * What solidifies and thins a cast slab continuously while producing | generating a solidified shell is known (patent document 1). In this type of continuous casting, side wedges are pressed against both end surfaces of a pair of cooling drums, and by rotating the cooling drums, side crucible refractories (nitrides containing aluminum such as AlN or oxynitrides containing aluminum such as SiAlON) ) To maintain the seal between the cooling drum and the side weir to prevent the molten steel from leaking. Hereinafter, in order to correspond to the constituent members of the present invention, twin-drum continuous casting is referred to as twin-roll casting, cooling drums as casting rolls, side weirs as weir plates, weir parts as melt nozzles and molten steel as melt.

JP 2005-305488 A

  In twin roll casting, the side plate is in direct contact with the molten metal, so heat resistance and heat retention are required, and in order to prevent the molten metal from leaking from the contact portion between the side plate and the casting roll, the side plate is The plate is pressed against the sliding surface with the casting roll. For this reason, since the heat load, erosion and wear by the molten metal occur simultaneously, there is a problem that the coating material constituting the surface layer of the side covering plate peels off and becomes foreign matter and mixes in the cast sheet.

  The problem to be solved by the present invention is to provide a twin-roll vertical casting apparatus and a twin-roll vertical casting method capable of suppressing foreign matter generated from a side plate from being mixed into a cast product.

The present invention is a twin-roll type vertical casting in which a molten metal is poured into a molten metal nozzle while rotating a pair of casting rolls, wherein when the molten metal poured into the molten metal nozzle passes through a roll gap, At least one of which is constituted by a plurality of side scissor plates arranged in the vertical direction , and is circulated along the vertical direction while being pressed by the pair of main scissor plates and the end face of the casting roll , the regeneration step provided on the circulation path of the conveyor, by Rukoto rearrangement the surface layer of the side dam to a new surface layer, to solve the above problems.

In the present invention, in the side plate, the vicinity of the roll gap where the molten metal poured into the molten metal nozzle becomes solid phase through solid-liquid coexistence, and the vicinity of the roll gap where it slides by being pressed by the casting roll In view of the fact that it is a portion that receives damage, the surface layer surface of the side wall plate is replaced with a new surface layer surface, and the side wall plate is moved along the vertical direction during casting. Relatively move the surface of the plate. That is, the damaged parts are dispersed on the surface of the side plate without concentrating on one place. As a result, it is possible to suppress the generation of foreign matter from the side siding plate due to the heat load, the erosion, and the wear by the molten metal, and it is possible to suppress the mixing thereof into the cast product.

It is a side view showing one embodiment of a twin roll type vertical casting device concerning the present invention. It is a side view of the principal part of FIG. 1A. It is a front view of FIG. 1B. It is a top view of FIG. 1A. It is a three-sided figure which shows the side plate of FIG. 1A, and a conveying machine. It is sectional drawing which shows the casting roll of FIG. 1A, a molten metal nozzle, and a roll gap. It is a side view which shows operation | movement of the side plate in process of casting of FIG. 1A. It is a front view which shows the side weir plate of FIG. 4A. It is a front view which shows other embodiment of the twin roll type | mold vertical casting apparatus which concerns on this invention.

  Hereinafter, an embodiment of the present invention will be described based on the drawings. FIG. 1A is a side view showing an embodiment of a twin roll vertical casting apparatus according to the present invention, and FIG. 1D is a plan view of FIG. 1A. The twin-roll type vertical casting apparatus 1 of the present embodiment cold-rolls the melted aluminum-based material at a cooling rate of, for example, 1000 ° C./sec or more, but is not particularly limited. And a casting apparatus for producing the sheet 2 of a predetermined length L. By increasing the cooling rate, even if the impurities are contained, there is an advantage that they do not grow large and the productivity is also high. The aluminum-based material as a casting material is not particularly limited, and includes, for example, aluminum, silicon, aluminum, silicon, magnesium, and other aluminum alloys in addition to aluminum. The melting point or liquidus temperature of these aluminum-based materials is approximately 580 to 670 ° C.

  The twin-roll vertical casting apparatus 1 of the present embodiment is disposed above the pair of casting rolls 11 and 12 opposed to each other with a predetermined roll gap 13 and the roll gap 13 of the pair of casting rolls 11 and 12. A melt nozzle 14 for receiving the melt 5 of the aluminum-based material; and a ladle 15 for containing the melt 5 of the aluminum-based material and pouring the melt 5 into the melt nozzle 14. Although not shown in FIG. 1A, the reaction force is estimated to estimate the reaction force that the molten metal 5 passing through the roll gap 13 from the molten metal nozzle 14 tries to push the roll gap 13 against the elastic bias. A control unit for controlling the amount of heat received per unit time received by the pair of casting rolls 11 and 12 from the molten metal 5 passing through the roll gap 13 in accordance with the reaction force estimated by the reaction force estimator. It is also good. As shown in FIG. 1D, the pair of casting rolls 11 and 12, the molten metal nozzle 14, and the ladle 15 are disposed such that the central axes CL in the width direction coincide with each other.

  The pair of casting rolls 11 and 12 are mounted on the gantry 4, and one casting roll 11 is provided to rotate around the rotation axis 111, and the other casting roll 12 is rotated in parallel with the rotation axis 111. It is provided to rotate about an axis 121. The position of one casting roll 11 in the present embodiment is fixed with respect to the rack 4, and the other casting roll 12 moves horizontally toward and away from the one casting roll 11 via the slide rail 41. It is made possible. The other casting roll 12 is resiliently biased by an elastic body 122 such as a spring or a fluid pressure cylinder in the direction toward one casting roll 11, but the roll gap 13 at the closest position is the target sheet The predetermined value exceeding zero according to the thickness t of 2 is set to 0.5 to 3 mm, for example, although not particularly limited. In addition, both of the pair of casting rolls 11 and 12 may be configured to be able to move toward and away from the gantry 4.

  The pair of casting rolls 11 and 12 are connected to the rotary drive motor 112 via transmission mechanisms such as pulleys and belts so as to rotate at equal circumferential speeds. Since the casting rolls 11 and 12 of the present embodiment have the same outer diameter, a single rotational drive motor 112 exerts a force that pushes down the molten metal 5 in the opposite directions, that is, the roll gap 13 in the vertical downward direction. Rotate at equal circumferential speed. In the example shown in FIG. 1A, one casting roll 11 rotates counterclockwise and the other casting roll 12 rotates clockwise. Although illustration is omitted, the rotational speed of the rotary drive motor 112 is controlled by an inverter device that makes the rotational speed of the output shaft variable, and the inverter device is controlled by a control command from the control unit.

  By the way, if the outer diameters of the pair of casting rolls 11 and 12 are equalized, one rotation drive motor 112 can be rotated at an equal peripheral speed without providing a transmission mechanism. Further, if the outer diameters of the pair of casting rolls 11 and 12 are made equal, and the centers of the main cover plates 141 and 142 of the molten metal nozzle 14 described later coincide with the centers of the roll gap 13, the molten metal 5 at the lower end of the molten metal nozzle 14 Since the areas of the contact surfaces 113 and 123 of the sheet and the casting rolls 11 and 12 become equal, the cooling rates on the front and back of the sheet to be cast become even. However, the pair of casting rolls 11 and 12 of the present invention may have different outer diameters as long as the peripheral speeds are equal. In this case, in order to equalize the areas of the contact surfaces 113 and 123 between the molten metal 5 at the lower end of the molten metal nozzle 14 and the casting rolls 11 and 12, the center position of the main cover plates 141 and 142 of the molten metal nozzle 14 is The center of the gap 13 may be shifted in either direction.

The pair of casting rolls 11 and 12 is configured by fixing metal plates 115 and 125 such as copper having good thermal conductivity to hubs 114 and 124 fixed to both ends of the rotating shafts 111 and 121, respectively. . A circulating system through which the refrigerant circulates is provided in a part or all of the inside of the metal plates 115 and 125, and at least the contact surfaces 113 and 123 with the molten metal 5 (hereinafter, these contact surfaces 113 and 123 are formed surfaces 116, 126 and good, its rotation axis 111, 121 direction length of _{W R.)} so that the refrigerant on the back surface of the metal plate 115, 125 to contact, or spray nozzle is provided, or a metal plate 115, 125 A part or the whole of the inside is taken as a refrigerant flow path. Each of the pair of casting rolls 11 and 12 of the present embodiment may include a temperature controller that regulates the temperature of at least the contact surfaces 113 and 123 of the casting rolls with which the molten metal 5 contacts.

  The molten metal nozzle 14 according to the present embodiment is opposed to the pair of main base plates 141 and 142 disposed in parallel to the rotary shafts 111 and 121 of the pair of casting rolls 11 and 12 and orthogonal to the rotary shafts 111 and 121. And a pair of side weir plates 143 and 144 in close contact with both end faces of the pair of main weir plates 141 and 142. That is, the molten metal nozzle 14 of the present embodiment has four side surfaces, and is formed as a rectangular cylinder whose upper and lower surfaces are open.

  The pair of main inlaying plates 141 and 142 uses a ceramic plate material having heat resistance that can withstand the melting point or liquidus temperature of the aluminum-based material as a base material, and the inner surface thereof (at least the inner surface surrounded by the main inlaying plate and the side insulating plate In the above, a heat insulating material layer having the same heat resistance is formed. The lower ends of the pair of main weir plates 141 and 142 are provided in contact with the surfaces of the pair of casting rolls 11 and 12 or with a slight gap therebetween. In addition, even when the other casting roll 12 is moved in the horizontal direction with respect to the gantry 4 on the main cover plate 141 provided in contact with the contact surface 123 of the other casting roll 12 or with a slight gap. A tensile elastic body 147 is provided to maintain contact with the contact surface 123 of the other casting roll 12 or a slight gap. On the other hand, the main weir plate 142 provided in contact with the contact surface 113 of one of the casting rolls 11 or with a slight gap is fixed in position with respect to the gantry 4 although not shown.

On the other hand, as shown in the plan view of FIG. 1D, the pair of side weir plates 143 and 144 includes the side edges of the pair of main weir plates 141 and 142, the hubs 114 and 124 of the pair of casting rolls 11 and 12, and And / or the metal plates 115 and 125 are pressed by the pressing devices 145 and 146. That is, as shown in FIG. 1D, the main length in the width direction of the sheathing board 141 and 142 _{W N} is the length in the width direction of the casting rolls 11, 12 (the rotation axis direction of the length of the molding surface 116, 126) W _The pair of side anchor plates 143 and 144 are formed substantially equal to _R, and the pair of main anchor plates 141 and 142 and the hubs 114 and 124 of the pair of casting rolls 11 and 12 and / or the metal plates 115 and 125 It is pressed. Thereby, the molten metal 5 is in a space surrounded by the pair of main weir plates 141 and 142, the pair of side weir plates 143 and 144, and the vicinity (contact surfaces 113 and 123) of the roll gap 13 of the casting rolls 11 and 12 Will be accepted.

  The side plate 143, 144 of this embodiment is made of a ceramic plate having heat resistance that can withstand the melting point or liquidus temperature of the aluminum-based material as the main plate 141, 142 as a base material. Heat resistance that can withstand the melting point or liquidus temperature of the aluminum-based material, and the hub 114, 124 and / or the hub 114, 124 and / or the pair of casting rolls 11, 12 It is formed of, for example, a soft material made of ceramic, which has a flexibility capable of securing a sealing property between the metal plates 115 and 125 when pressed. The details of the pressing devices 145 and 146 for pressing the side weir plates 143 and 144 and the conveyers 148 and 149 for moving the side weir plates 143 and 144 will be described later.

  A ladle (ladle) 15 is provided above the molten metal nozzle 14, and a ladle moving mechanism (not shown) such as a hoist crane is provided for injecting the molten metal 5 contained in the ladle 15 into the molten metal nozzle 14. It is done. The solid raw material of the aluminum-based material is melted in a separate melting furnace in a state of being charged into the ladle 15, and this ladle 15 is moved to the vicinity of the molten metal nozzle 14 by the ladle moving mechanism, and the molten metal is inclined by tilting the ladle 15. 5 is injected into the molten metal nozzle 14. The ladle 15 shown in FIG. 1A and FIG. 1D shows the case of performing so-called batch casting, but the ladle applicable to the present invention continuously converts the molten metal 5 of the aluminum material melted by the melting furnace into the ladle 15 The continuous type of the type of the type in which the hot water is supplied and the molten metal 5 is continuously poured from the pouring port of the ladle 15 to the molten metal nozzle 14 is also included.

  Below the pair of casting rolls 11 and 12, a guide plate 6 for guiding the aluminum sheet 2 in a solid state through the roll gap 13 in a substantially horizontal direction is provided, and a guide roller 7 and winding are provided downstream thereof. A picker 3 is provided. The aluminum sheet 2 which has passed through the roll gap 13 and is in a solid state is guided in the horizontal direction by the guide plate 6 and then is rolled up by the winder 3 while sliding on the upper surface of the guide roller 7.

  FIG. 3 is a cross-sectional view showing the main part of the casting surrounded by the molten metal nozzle 14 and the pair of casting rolls 11, 12 in the twin-roll vertical casting device 1 of the present embodiment. In the twin roll vertical casting apparatus 1 of the present embodiment, the molten metal 5 is injected from the ladle 15 to the molten metal nozzle 14 simultaneously with the start of the rotation of the pair of casting rolls 11 and 12 or with a slight time lag. In the initial stage of the molten metal injection, the injection speed (injected volume per unit time) of the molten metal 5 into the molten metal nozzle 14 is the casting speed (per unit time) of the aluminum sheet 2 which passes through the roll gap 13 and becomes solid state. Set the speed higher than the casting volume).

  The molten metal 5 injected into the molten metal nozzle 14 is a pair of casting rolls 11 from a point P1 intersecting the central horizontal line of the roll gap 13 to a point P2 provided in contact with the main plate 141, 142 or with a slight gap. The molten metal 5 is cooled and begins to solidify by coming into contact with the twelve contact surfaces 113 and 123. In FIG. 3, the molten metal in the liquid phase is denoted by reference numeral 51, the molten metal in the solid-liquid coexistence is denoted by reference numeral 52, and the molten metal (that is, the aluminum sheet 2) is indicated by reference numeral 53.

  The twin roll vertical casting apparatus 1 of the present embodiment is a cold rolling method in which the cooling rate of the molten metal 5 is, for example, 1000 ° C./sec or more, and the pair of casting rolls 11 according to the cooling rate of the molten metal 5. , 12 circumferential speeds are set. Here, if the temperature when the molten metal 51 in the liquid phase comes in contact with the contact surfaces 113 and 123 is high, the solidification speed becomes slow, and the existence regions of the molten metal 51 in the liquid phase and the molten metal 52 in the solid-liquid coexistence shown in FIG. , In the same figure will be shifted downward. For this reason, the ratio of the molten metal 51 in the liquid phase to the whole among the molten metal passing through the roll gap 13 increases, and the ratio of the molten metal 53 in the solid phase decreases to the whole. As a result, the reaction force to spread the roll gap 13 is reduced. Thereby, the roll gap 13 becomes small. Conversely, if the temperature when the molten metal 51 in the liquid phase comes in contact with the contact surfaces 113 and 123 is low, the solidification speed is increased, and the existence regions of the molten metal 51 in the liquid phase and the molten metal 52 in the solid / liquid coexistence shown in FIG. In the figure, it will be shifted upward. Therefore, the ratio of solid phase molten metal 53 to the whole of the molten metal passing through the roll gap 13 increases and the ratio of liquid phase 51 to the whole decreases, so that the elastic bias of the elastic body 122 is violated. As a result, the reaction force to expand the roll gap 13 is increased. Thereby, the roll gap 13 becomes large. Thus, when the temperature of the molten metal 5 injected into the molten metal nozzle 14 fluctuates, the dimensions of the roll gap 13 fluctuate, and as a result, the thickness t of the obtained aluminum sheet 2 becomes nonuniform.

  Further, in the twin roll type vertical casting apparatus 1 of the present embodiment, the molten metal 5 of a predetermined amount is injected into the molten metal nozzle 14 by a so-called batch method, and an aluminum sheet of a predetermined thickness t, a predetermined width W and a predetermined length L 2 is obtained, but the weight of the molten metal 5 injected into the molten metal nozzle 14 acts as a gravity on the roll gap 13 during casting. That is, when the liquid level of the molten metal 5 injected into the molten metal nozzle 14 is high (when the molten metal weight is large), the reaction force for pushing the roll gap 13 against the elastic bias of the elastic body 122 increases. . Thereby, the roll gap 13 becomes large. When the liquid level of the molten metal 5 injected into the molten metal nozzle 14 is high (when the molten metal weight is large), the degree of adhesion between the molten metal 5 and the contact surfaces 113 and 123 is increased, and the solidification efficiency of the molten metal 5 is increased. For this reason, the existing regions of the molten metal 51 in the liquid phase and the molten metal 52 in the solid / liquid coexistence shown in FIG. 3 are shifted upward in the same drawing, and the molten metal 53 in solid phase among the molten metals passing through the roll gap 13 is entirely. The ratio of the molten metal 51 in the liquid phase decreases as a whole. For this reason, the reaction force to spread the roll gap 13 against the elastic bias of the elastic body 122 is increased. Also by this, it can be said that the roll gap 13 becomes large.

  On the contrary, if the liquid level of the molten metal 5 injected into the molten metal nozzle 14 is low (if the molten metal weight is small), the reaction force for pushing the roll gap 13 against the elastic bias of the elastic body 122 decreases. Do. Thereby, the roll gap 13 becomes small. Further, if the liquid level of the molten metal 5 injected into the molten metal nozzle 14 is low (if the molten metal weight is small), the degree of adhesion between the molten metal 5 and the contact surfaces 113 and 123 becomes small, and the solidification efficiency of the molten metal 5 becomes low. For this reason, the existing regions of the molten metal 51 in the liquid phase and the molten metal 52 in the solid-liquid coexistence shown in FIG. 3 are shifted downward in the same drawing, and the molten metal 51 of the liquid phase among the molten metal passing the roll gap 13 is entirely. The ratio of the solid phase molten metal 53 to the whole decreases. For this reason, the reaction force which tries to spread the roll gap 13 against the elastic bias of the elastic body 122 is reduced. Also by this, it can be said that the roll gap 13 becomes small. As described above, when the position of the liquid surface of the molten metal 5 injected into the molten metal nozzle 14 changes, the dimension of the roll gap 13 changes, and as a result, the thickness t of the obtained aluminum sheet 2 becomes nonuniform.

  For this reason, in the twin-roll type vertical casting apparatus 1 of the present embodiment, the molten metal 5 passing through the roll gap 13 has a reaction force to push the roll gap 13 against the elastic bias of the elastic body 122. A reaction force estimator to estimate, for example, a liquid level position detector of the melt nozzle 14 and a melt temperature detector of the melt nozzle 14 are provided, and the pair of casting rolls 11, 12 according to the reaction force estimated by this reaction force estimator. A control unit is provided to control the amount of heat received per unit time received from the molten metal 5 passing through the roll gap 13. The larger the estimated reaction force, the smaller the amount of heat received per unit time, and the estimated reaction force The smaller the value, the larger the amount of heat received per unit time may be controlled.

  Next, the conveyers 148 and 149 for moving the side cover plates 143 and 144 and the pressers 145 and 146 for pressing the side cover plates 143 and 144 will be described. 1B shows the twin roll type vertical casting apparatus 1 shown in FIG. 1A, a pair of casting rolls 11, 12, a pair of main wedges 141, 142, one 143 of the pair of side wedges, one 145 of the pressing machine and The side view which extracted and showed only one side 148 of a conveying machine, and Drawing 1C are front views of Drawing 1B. Although only one transport 148 is shown in FIG. 1B and both transports 148 and 149 are shown in FIG. 1C, the basic configuration is the same.

  The conveyors 148 and 149 of this embodiment are belt conveyors that allow a certain degree of deflection, and in this example, three conveyor chains 148A and 149A and sprockets 148B and 149B that engage with the conveyor chains 148A and 149A. And drive motors 148C and 149C for rotating the sprockets 148B and 149B at a predetermined rotational speed. The conveyor chains 148A and 149A are not limited to three, and may be one or two or four or more. The conveyor chains 148A and 149A are endless belts as shown in FIG. 1C, and each circulates at the same speed, but moves vertically in the vicinity of both ends of at least a pair of casting rolls 11 and 12 The orbit is set. The drive motors 148C and 149C are motors whose rotational speed is variable, and the rotational speed is controlled by a control signal from a drive motor control device (not shown).

  FIG. 2 is a three-sided view showing one of the side weir plates 143 and 144 and one of the conveyers 148 and 149, as shown in the figure, the back surface of each side weir plate 143 or 144 (the outer surface of the molten metal nozzle 14 A plurality of engaging concave portions 1431 and 1414 are formed on the surface constituting the first and second engaging concave portions 1431 and 1414 provided at a predetermined pitch on the respective conveyor chains 148A and 149A engage with the engaging concave portions 1431 and 1414 . As a result, the plurality of side weir plates 143 and 144 move in accordance with the rotation of the drive motors 148C and 149C of the conveyers 148 and 149 while being held at a predetermined pitch of the conveyor chains 148A and 149A. In the embodiment shown in FIG. 1C, at the both ends of the pair of casting rolls 11 and 21, the side weir plates 143 and 144 move upward in the vertical direction, but may move downward.

  As shown in FIG. 1B to FIG. 1D, the pressers 145 and 146 of the present embodiment have stands 145A and 146A for fixing the pressers 145 and 146, respectively, and fluid for generating pressing force to the side weir plates 143 and 144. The pressure cylinders 145B and 146B, and pressure pads 145C and 146C provided at the tips of the rods of the fluid pressure cylinders 145B and 146B and in contact with and separated from the back surfaces of the side wedge plates 143 and 144, respectively. Then, as shown in FIGS. 1B to 1D, the first position where the molten metal nozzle 14 is configured by the conveyers 148 and 149, that is, the roll gap 13 shown in FIG. The hydraulic cylinders 145B, 145B are in a state in which the conveyor chains 148A, 149A remain engaged with the back side of the side board 143, 144 that has arrived at a position including a cross section surrounded by the boards 141, 142. The 146B is operated to press the pressing pads 145C and 146C. As a result, as shown in FIG. 1D, the side weir plates 143 and 144 arriving at this first position are pressed against the both end faces of the pair of main weir plates 141 and 142 and the pair of casting rolls 11 and 12, and as a result The sealability of the molten metal nozzle 14 is secured.

  As shown in FIG. 1B, in the side weir plates 143 and 144, the length in the vertical direction between the upper end and the lower end is a predetermined length from the longitudinal length from the upper end of the pair of main weir plates 141 and 142 to the roll gap 13 Only long has been formed. This predetermined length is cast while the side anchor plates 143 and 144 are conveyed by the conveyors 148 and 149 to the first position shown in FIG. Until the process is completed, the roll gap 13 shown in FIG. 3 has a length including at least a cross section surrounded by the contact surfaces 113 and 123 with the molten metal and the pair of main weir plates 141 and 142. Therefore, when the predetermined first speed is large, the longitudinal length of the side weir plates 143 and 144 is formed long, and conversely, when the predetermined first speed is small, the side weir plates 143 and 144 The longitudinal length is relatively short.

  The transport machines 148 and 149 of the present embodiment control the drive motors 148 C and 149 C to start the plurality of side weir plates 143 and 144 at the first speed during the period from the start of casting of one batch to the end of casting. In the vertical direction in the vertical direction, the casting plate is in the first position at a second speed higher than the first speed after the end of casting until the start of the next casting (FIG. 1B In the second position adjacent to the reference numeral 143) (shown by reference numeral 143a in FIG. 1B) moves to the first position, and the side reference plate 143 in the first position is the third position on the upper side thereof. The plurality of side gobos are moved in the vertical direction so as to move to (indicated by reference numeral 143b in FIG. 1B).

From the start of casting of one batch to the end of casting, the side plate 143, 144 in the first position is pressed on the back side by the pressing pads 145C, 146C of the pressing machines 145, 146 described above , Vertically upward at a first speed by the conveyers 148 and 149. That is, the side weir plates 143 and 144 move while the back surfaces of the side weir plates 143 and 144 at the first position slide on the pressing pads 145C and 146C. At this time, the conveyor chains 148A and 149A are flexed, and the engagement between the engagement recesses 1431 and 1414 of the side weir plates 143 and 144 and the engagement projections 1481 and 1491 of the conveyor chains 148A and 149A is maintained. Then, when the casting is completed, the fluid pressure cylinders 145B and 146B of the pressers 14 5 and 14 6 operate to retract the pressure pads 145C and 146C, thereby releasing the side weir plates 143 and 144 at the first position. Between the end of casting and the start of the next casting, the side plates 143 and 144 are batch-transferred to the next stage at a relatively high second speed.

Next, the operation will be described.
In the case of casting the aluminum sheet 2 using the twin-roll type vertical casting apparatus 1 of the present embodiment, first, a plurality of side weir plates 143 engaged and held by the conveyor chains 148A and 149A by the conveyers 148 and 149. , 144 are moved to the first position as shown in FIG. 1B. Then, the fluid pressure cylinders 145B and 146B of the pressing machines 145 and 146 are operated to move the pressing pads 145C and 146C forward, and the side chains located at the first position are kept engaged with the conveyor chains 148A and 149A. The back surfaces of the plates 143 and 144 are pressed, and the side anchor plates 143 and 144 are pressed against the opposite end edges of the pair of main anchor plates 141 and 142 and the both end surfaces of the pair of casting rolls 11 and 12. Thereby, the molten metal nozzle 14 in which the sealability was ordered is comprised.

  Next, the drive motors 148C and 149C of the conveyers 148 and 149 are controlled to set the conveyance speed of the conveyor chains 148A and 149A to the first speed, and the side weir plates 143 and 144 at the first position are vertically The molten metal 5 is injected from the ladle 15 to the molten metal nozzle 14 simultaneously or with a slight time lag while starting the rotation of the pair of casting rolls 11 and 12 while moving along the direction. The molten metal 5 injected into the molten metal nozzle 14 is, as shown in FIG. 3, from a point P1 intersecting the central horizontal line of the roll gap 13 to a point P2 provided in contact with the main plate 141, 142 or with a slight gap. The molten metal 5 is cooled and begins to solidify by coming into contact with the contact surfaces 113 and 123 of the pair of casting rolls 11 and 12. The twin roll vertical casting apparatus 1 of the present embodiment is a cold rolling method in which the cooling rate of the molten metal 5 is, for example, 1000 ° C./sec or more, and the pair of casting rolls 11 according to the cooling rate of the molten metal 5. , 12 circumferential speeds are set.

  The aluminum sheet 2 having passed the roll gap 13 is sequentially extruded by the rotation of the casting rolls 11 and 12, guided by the guide plate 6 and the guide roller 7, and taken up by the winding machine 3. In such a casting process, the side weir plates 143 and 144 slide along the vertically upward direction while sliding on the end faces of the pair of main weir plates 141 and 142 and the casting rolls 11 and 12 while securing the sealing property of the molten metal nozzle 14. Moving.

Here, since the surface layer surface of the side weir plates 143 and 144 is formed of a soft material having a certain degree of flexibility to secure the sealing property, the molten metal 5 poured into the molten metal nozzle 14 is shown in FIG. The heat load from the molten metal 5 is applied in the vicinity of the roll gap 13 to be the solid-liquid coexisting molten metal 52 and the solid phase molten metal 53 and in the vicinity of the roll gap 13 pressed and slid by the pair of casting rolls 11 and 12 The surface layer is the most damaged since erosion and wear also occur. The range which receives the most damage is shown by S1 in FIG. 4A. The surface layer surface of the side covering plates 143 and 144 also receives a heat load from the molten metal 5 at a portion in contact with the molten metal 51 in the liquid phase shown in FIG. 3. In FIG. 4A, a range to be damaged next is indicated by S2. Therefore, if the side weir plates 143 and 144 are fixed to the main weir plates 141 and 142 and the pair of casting rolls 11 and 12, damage concentrates on the surface surface of the ranges S1 and S2 shown in FIG. 4A. There is a possibility that the soft material which constitutes the surface side concerned exfoliates, becomes a foreign material, and mixes in a cast sheet.

  However, in the present embodiment, since the side anchor plates 143 and 144 are moved along the vertically upward direction at the first speed from the start of casting to the end of casting, the range S1, S2 to be damaged However, as shown to FIG. 4B, it moves relatively on the surface of the side plate 143,144. That is, the range S1, S2 which receives damage disperses on the surface of the side weir plate 143, 144 without concentrating on one place. As a result, it is possible to suppress the generation of foreign matter from the side weir plates 143 and 144 due to the heat load, the erosion and the wear by the molten metal 5, and it is possible to suppress the mixing thereof into the aluminum sheet 2.

  In addition, since the damage is larger in the range S1 among the ranges S1 and S2 that receive damage, moving the side weir plates 143 and 144 along the vertically upward direction causes the side weir plates to be in the range S1 where the damage is large. With the movement of 143 and 144, the surface layer which is not always damaged at all moves to the range S1. On the other hand, when the side weir plates 143 and 144 are moved along the vertically downward direction, the surface layer surface damaged in the range S2 is moved to the range S1 where the damage is large. Therefore, moving the side weir plates 143 and 144 along the vertically upward direction reduces overall damage as compared with moving the side weir plates 143 and 144 along the vertically downward direction, and the heat load by the molten metal 5 is further enhanced. It is possible to suppress the generation of foreign matter from the side weir plates 143 and 144 due to corrosion and abrasion, and to suppress this from being mixed into the aluminum sheet 2.

  Next, when the molten metal 5 poured into the molten metal nozzle 14 disappears, the casting is finished. At the end of the casting, the fluid pressure cylinders 145B and 146B of the pressers 145 and 146 are operated to retract the press pads 145C and 146C, and the conveyors 148A and 149A are kept engaged with the conveyor chains. The drive motors 148C and 149C of 148 and 149 are controlled to set the transport speed of the conveyor chains 148A and 149A to a second speed higher than the first speed, and the side weir plates 143 and 144 at the first position are vertically By moving along the direction, the side weir plate 143a shown in FIG. 1B is moved to the first position. After this, the above operation is repeated.

Next, another embodiment of the twin roll vertical casting apparatus according to the present invention will be described. FIG. 5 is a front view showing another embodiment of the twin roll vertical casting apparatus according to the present invention. Hereinafter, the same reference numerals as in the specification and the drawings are given to constituent members common to the double-roll type vertical casting apparatus 1 according to the above-described embodiment, and all or part of the description thereof is used and omitted. Twin-roll vertical casting apparatus 1 according to the embodiment shown in Figure 5, with respect to twin-roll vertical casting apparatus 1 according to the embodiment described above, the conveyor chain 1 48A of conveyor 148 and 149, a closed loop of 149A In the middle, the surface layer surface of the side covering plate 143, 144 whose surface layer surface is damaged by passing through the first position constituting the molten metal nozzle 14 is replaced with the step 8A of attaching the surface layer surface to a new surface layer The difference is that the surface layer drying step 8B is included.

  That is, the side weir plates 143 and 144 of this embodiment have a ceramic plate material having heat resistance that can withstand the melting point or liquidus temperature of the aluminum-based material as a base material, and its surface layer (at least the main weir plate and the side weir plate A heat insulating material having the same heat resistance and flexibility is adhered to the inner surface). Therefore, in the reattachment process 8A, the surface layer surface of the side weir plate 143, 144 which has been damaged by passing through the first position constituting the molten metal nozzle 14 is attached to a new surface layer surface, and the drying step Dry the adhesive when pasting at 8B. As a result, in the first position of the twin-roll vertical casting device 1, the side weir plates 143 and 144 having novel surface layers are continuously supplied.

  According to the twin roll type vertical casting apparatus 1 of the present embodiment configured as described above, the side weir plate 143, which has a relatively low first speed, from the start of casting to the end of casting. Since 144 is moved along the vertically upward direction, as shown in FIG. 4B, the damaged areas S1 and S2 move relatively on the surface of the side plate 143, 144. That is, the range S1, S2 which receives damage disperses on the surface of the side weir plate 143, 144 without concentrating on one place. As a result, it is possible to suppress the generation of foreign matter from the side weir plates 143 and 144 due to the heat load, the erosion and the wear by the molten metal 5, and it is possible to suppress the mixing thereof into the aluminum sheet 2.

  Further, according to the twin-roll type vertical casting apparatus 1 of the present embodiment, moving the side weir plates 143 and 144 along the vertically upward direction is more comprehensive than moving along the vertically downward direction. It is possible to further suppress the generation of foreign matter from the side weir plates 143 and 144 due to the heat load, the erosion and the wear by the molten metal 5 and to suppress the mixing thereof into the aluminum sheet 2.

  Further, according to the twin-roll vertical casting apparatus 1 of the present embodiment, by controlling the drive motors 148C and 149C of the conveyers 148 and 149, a plurality of side weir plates 143 are provided from the casting start to the casting end. , 144 vertically at a relatively low first speed, and from the end of casting to the start of the next casting, at a second speed higher than the first speed, in the side plate 143 in the first position, The plurality of side anchor plates 143 and 144 are moved along the vertical direction so that the side anchor plates at the second position adjacent to 144 move to the first position, so the setup time to the next casting step is shortened. To improve productivity.

  Further, according to the twin-roll type vertical casting apparatus 1 of the present embodiment, as shown in FIG. 5, the regenerating step of regenerating the surface layer surface of the side weir plate 143, 144 which has passed the first position And the drying step 8B, the side plate 143, 144 having a novel surface layer surface is continuously supplied to the first position of the twin roll vertical casting apparatus 1.

DESCRIPTION OF SYMBOLS 1 ... Double roll type vertical casting apparatus 11 ... Casting roll 111 ... Rotation axis 112 ... Rotation drive motor 113 ... Contact surface with a molten metal 114 ... Hub 115 ... Metal plate 116 ... Forming surface 12 ... Casting roll 121 ... Rotation axis 122 ... Elastic body 123 Contact surface with molten metal 124 Hub 125 Metal plate 126 Forming surface W _R Length of molding surface in the direction of rotational axis 13 Roll gap 14 Molten metal nozzle 141, 142 Main sheet 143, 144 ... Side plate 1431, 1441 ... Engaging recess 145, 146 ... Pressing machine 145A, 146A ... Stand 145B, 146B ... Fluid pressure cylinder 145C, 146C ... Pressing pad 147 ... Tensile elastic body 148, 149 ... Transporting machine 148A, 149A ... Conveyor chains 1481 and 1491 ... engaging projections 148B and 149B ... sprocket 148C 149C ... drive motor 15 ... ladle (ladle)
2. Aluminum sheet t Thickness of aluminum sheet W Width of aluminum sheet L Length of aluminum sheet 3 Winding machine 4 Mounting frame 41 Slide rail 5 Molten metal 51 Molten liquid phase 52 Solid-liquid coexistence Molten metal 53 ... Solid phase molten metal (sheet)
6 Guide plate 7 Guide roller 8A Reassigning process of the surface of the side plate 8B Drying of the surface of the side plate

Claims (9)

A twin roll vertical casting apparatus for producing an aluminum-based material into a sheet, comprising:
A pair of casting rolls disposed opposite to each other with a predetermined roll gap, rotating at equal circumferential speeds about mutually parallel rotation axes, and elastically urged in a direction toward relatively close each other;
It includes a pair of main weir plates disposed opposite to each other in parallel with the rotation axis, and a pair of side weir plates oppositely disposed orthogonal to the rotation axis and in close contact with both end faces of the pair of main weir plates. A melt nozzle disposed above the roll gap of the pair of casting rolls and into which a melt of an aluminum-based material is poured;
The pair of at least one side dam plates, vertically includes a plurality of side dam plate which is disposed, said plurality of side dam plate in a state where the pressed by the pair of main barrier plate and the end face of the casting rolls And a closed-loop conveyor type carrier for moving and circulating along the vertical direction,
The twin roll type vertical casting apparatus comprises a regeneration step of replacing the surface layer surface of the side anchor plate with a new surface layer surface in the circulation path of the transfer machine . The twin roll type vertical casting apparatus according to claim 1, wherein the regenerating step includes a drying step of drying the resurfaced surface. The twin roll type vertical casting apparatus according to claim 1 or 2, wherein the side weir plate is held by the carrier by the engagement of the engagement convex portion and the engagement concave portion. Wherein each of the pair of side dams, one of said pair of main barrier plate and the casting rolls of the end face and the pressing claims which is provided movably in the vertical direction in the state 1-3 to 1 The twin-roll type vertical casting apparatus according to the above item . The press machine which presses and opens the side weir plate which exists in the 1st position which comprises the said molten metal nozzle among these side weir plates to the pair of main weir plates and the end face of the casting roll,
The pressing machine is
Between the casting start and the casting end, the side weir plate at the first position is pressed against the pair of main weir plates and the end face of the casting roll;
The twin-roll type vertical casting apparatus according to any one of claims 1 to 4 , wherein the side plate in the first position is opened from the end of casting to the start of the next casting. The carrier is
Between the start of casting and the end of casting, the plurality of side anchor plates are moved vertically at a first speed,
From the end of casting to the start of the next casting, at a second speed that is higher than the first speed, the side board in the second position adjacent to the side board in the first position moves to the first position The twin-roll type vertical casting apparatus according to claim 5 , wherein the plurality of side gobo plates are moved along the vertical direction. The twin-roll type vertical casting apparatus according to any one of claims 1 to 6 , wherein the conveyer moves the side gobo plates upward in the vertical direction. The roll gaps of a pair of casting rolls opposite to each other with a predetermined roll gap, rotating at equal circumferential speeds about mutually parallel rotation axes, and elastically biased in a relatively close direction,
It includes a pair of main weir plates disposed opposite to each other in parallel with the rotation axis, and a pair of side weir plates oppositely disposed orthogonal to the rotation axis and in close contact with both end faces of the pair of main weir plates. Twin roll type vertical casting, wherein the molten metal is poured from a molten metal nozzle disposed above the roll gap of the pair of casting rolls to receive the molten metal of the aluminum-based material to manufacture the aluminum-based material into a sheet Method,
Pouring the molten metal into the molten metal nozzle;
At least one of the, constituted by a plurality of side dam plate which is arranged in a vertical direction, the pair of state and the main sheathing board was pressed on the end surface of the casting rolls, wherein the plurality of sides of said pair of side dams Moving and circulating the weir plate along the vertical direction by a closed loop conveyor type conveyor , and rotating the pair of casting rolls so that the molten metal passes through the roll gap;
A regeneration process provided in the circulation path of the transfer machine, and re-laying the surface layer surface of the side anchor plate to a new surface layer surface;
Double-roll vertical casting method including:   The twin roll vertical casting method according to claim 8, wherein the side anchor plate is moved upward in the vertical direction.

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