JP6511968B2 - 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.

  As a twin roll vertical casting device capable of sampling sheets with stable plate thickness and quality at high speed without being influenced by the state of molten metal liquid surface, a pair of main rods and a pair of main rods and above the pair of water cooled rotary rolls There is known one having a molten metal nozzle formed by extending a pair of lateral weirs (Patent Document 1). The molten metal is poured into the molten metal nozzle from a ladle (ladle) containing the molten metal.

Patent No. 4873626 gazette

When the molten metal is poured from the pouring port into the molten metal nozzle by tilting the ladle , the molten metal flowing out from the pouring port spreads in the width direction, and the molten metal scatters and adheres to the sliding portion between the weir and the casting roll Since the possibility is high, if the cleaning etc. is not performed frequently, the casting roll will stick and will not rotate at a stable circumferential speed.

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 rotating a casting roll at a stable circumferential speed .

The present invention provides the above-mentioned convex portions at both ends of the pouring port of the ladle, which are convex toward the center in plan view and the width of the pouring port is narrower than the width of the ladle main body containing the molten metal of aluminum-based material. Solve the problem.

The flow velocity of the molten metal flowing out of the ladle main body is partially increased by providing convex portions which are convex toward the center in plan view at both end portions of the pouring gate, and the molten metal flowing out of the pouring gate widens in the width direction Can be suppressed so that Thereby, the molten metal can be prevented from scattering and adhering to the sliding portion of the side plate and the casting roll, so that the twin roll vertical casting apparatus can be operated stably .

It is a side view showing one embodiment of a twin roll type vertical casting device concerning the present invention. It is a top view of FIG. It is a disassembled perspective view of FIG. It is sectional drawing of the principal part of FIG. It is a graph which shows the 1st example of the control map memorize | stored in the control unit of FIG. It is a graph which shows the 2nd example of the control map memorize | stored in the control unit of FIG. It is a graph which shows the 3rd example of the control map memorize | stored in the control unit of FIG. It is a graph which shows the Example and comparative example which measured the time-dependent change of the roll gap, the circumferential speed of a casting roll, and the position of the liquid level of a molten metal. It is a graph which shows the Example and comparative example which measured the time-dependent change of the roll gap, the circumferential speed of a casting roll, and the temperature of a molten metal. It is a graph which shows the Example and comparative example which measured the time-dependent change of the roll gap in the casting initial stage, the circumferential speed of a casting roll, and the position of the liquid level of a molten metal. It is a graph which shows the Example and comparative example which measured the time-dependent change of the roll gap in the end of casting, the circumferential speed of a casting roll, and the position of the liquid level of a molten metal. (A) is a top view which shows an example of the ladle of FIG.1 and FIG.2, (B) is a top view which shows a lid attached to the opening of a ladle, (C) is a sectional view which meets an XC-XC line. . It is an enlarged perspective view which shows the XI section of FIG. (A) is a top view which shows the other example of the ladle of FIG. 1 and FIG. 2, (B) is sectional drawing in alignment with a XIIB-XIIB line | wire. (A) is a top view which shows the further another example of the ladle of FIG. 1 and FIG. 2, (B) is sectional drawing in alignment with a XIIIB-XIIIB line | wire. It is a side view which shows the whole twin roll type | mold vertical casting apparatus to which the other example of the ladle of FIG.1 and FIG.2 is applied. It is a top view which shows the twin roll type | mold vertical casting apparatus using the ladle concerning a comparative example. In the twin roll type vertical casting apparatus using the ladle according to the comparative example shown in FIG. 15A, it is a figure showing the result of measuring the molten metal temperature and the casting roll temperature at the center part and the end part of the rotating shaft. It is an electron micrograph which shows the cross-sectional state of the width direction center part of the aluminum sheet material manufactured with the twin roll type | mold vertical casting apparatus using the ladle which concerns on the comparative example shown to FIG. 15A. It is an electron micrograph which shows the cross-sectional state of the width direction center part of the aluminum sheet material manufactured by the twin roll type | mold vertical casting apparatus shown in FIG.1 and FIG.2. The aluminum sheet material manufactured by the twin roll type vertical casting apparatus (example) shown in FIG. 1 and FIG. 2 and the aluminum sheet material manufactured by the twin roll type vertical casting apparatus (comparative example) shown in FIG. 15A respectively It is an electron micrograph which shows the surface state (upper figure) and the cross-sectional state (lower figure).

  Hereinafter, an embodiment of the present invention will be described based on the drawings. 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 molten metal nozzle 14 for receiving the molten metal 5 of the aluminum-based material; a ladle 18 for containing the molten metal 5 of the aluminum-based material and pouring the molten metal 5 into the molten metal nozzle 14; and a molten metal passing the roll gap 13 from the molten metal nozzle 14 A reaction force estimator 15 estimates a reaction force that tends to push the roll gap 13 wide against the elastic bias, and a pair of casting rolls 11 according to the reaction force estimated by the reaction force estimator 15 , 12 controls the amount of heat received per unit time received from the molten metal 5 passing through the roll gap 13, and a control unit 16. As shown in FIG. 2, the pair of casting rolls 11 and 12, the molten metal nozzle 14, and the ladle 18 are disposed such that central axes CL in the width direction thereof 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 FIGS. 1 and 4, one casting roll 11 rotates counterclockwise, and the other casting roll 12 rotates clockwise. The rotational speed of the rotary drive motor 112 is controlled by an inverter device 116 that makes the rotational speed of the output shaft variable, and the inverter device 116 is controlled by a control command from the control unit 16. I will mention later.

  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 fixes the hollow cylindrical bodies 114 and 124 to hubs (not shown) respectively fixed to both ends of the rotating shafts 111 and 121, and copper having good heat conductivity on the surfaces And the like, and is configured by fixing metal layers (metal plates) 115 and 125. A circulation system 171 through which a heat medium to be described later circulates is provided in a part or all of the inside of the hollow cylindrical bodies 114 and 124, and at least contact surfaces 113 and 123 with the molten metal 5 (hereinafter, these contact surfaces 113, 123 is also referred to as the molding surface 126, the length of the rotary shaft 111, 121 direction _{W R} that.) as the heat medium to the metal layer 115, 125 of the back contacts of, or provided with a spray nozzle or hollow, A part or the whole of the insides of the cylindrical cylinders 114 and 124 is used as a heat medium flow path. Each of the pair of casting rolls 11 and 12 of the present embodiment includes a temperature controller 17 that adjusts the temperature of at least the contact surfaces 113 and 123 of the casting rolls with which the molten metal 5 contacts, the details of which will be described later.

  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 anchor plates 141 and 142 and the pair of side anchor plates 143 and 144 are made of 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. A heat insulating material layer having the same heat resistance is formed on the inner surface surrounded by the side cover plate. 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. Further, as shown in the plan view of FIG. 2, the pair of side weir plates 143, 144 is pressed against the side edges of the pair of main weir plates 141, 142 and both side surfaces of the pair of casting rolls 11, 12. , 146 abut on. That is, the main widthwise length _{W N} of the sheathing board 141 is formed to be almost equal to the _{W R} (length in the rotation axis direction of the molding surface 126) widthwise of the length of the casting rolls 11 and 12, a pair The side weir plates 143 and 144 are pressed by the pair of main weir plates 141 and 142 and the pair of casting rolls 11 and 12. 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.

  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.

  A ladle 18 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 18 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 while being charged into the ladle 18, and this ladle 18 is moved to the vicinity of the molten metal nozzle 14 by the ladle moving mechanism, and the ladle 18 is inclined to tilt the molten metal. 5 is injected into the molten metal nozzle 14.

  10 (A) is a plan view showing an example of the ladle main body 181 of the ladle 18 of FIGS. 1 and 2, and FIG. 10 (B) is a plan view showing the lid 184 attached to the opening 183 of the ladle 18. FIG. 10C is a cross-sectional view taken along the line XC-XC in FIG. The ladle 18 of the present embodiment is a rectangular parallelepiped bottomed cylindrical shape, and includes a ladle main body 181 having an opening 183 on the upper surface, and a lid 184 that covers the opening 183 on the upper surface so as to be openable and closable. Ladle body 181 is made of a ceramic material or the like having heat resistance to the extent that it can withstand the temperature of molten metal 5 of aluminum, and lid 184 is a heat insulating property for suppressing heat dissipation of molten metal 5 accommodated in ladle body 181. Or made of a metal material or ceramic material having heat shielding properties. The ladle 18 of FIG. 1 and FIG. 2 is configured by attaching the lid 184 of FIG. 10B to the ladle main body 181 of FIG. 10A so as to be able to open and close using a hinge 185 or the like.

In the case of batch casting, the ladle body 181 has a width W _L0 , a length L _L and a depth D _L so that the volume V can accommodate the molten metal 5 of a predetermined amount V ₀ required for one batch. It is set. Further, as described above, the solid raw material of the aluminum-based material is melted in a separate melting furnace in a state of being introduced into the ladle 18, and this ladle 18 is moved to the vicinity of the molten metal nozzle 14 by the ladle moving mechanism, The molten metal 5 is injected into the molten metal nozzle 14 by inclining 18. Therefore, one side of the opening 183 of the ladle body 181 on the molten metal nozzle 14 side is the pouring port 182, and the pouring port sidewall 186 from the pouring port 182 to the bottom surface of the ladle body 181 inclines the ladle 18 The molten metal 5 is inclined so as to gradually flow out from the pouring port 182.

At both end portions of the pouring port 182 of the ladle main body 181 of the present embodiment, convex portions 187 which are convex toward the center in a plan view of FIG. 10A are formed. The upper surface of the convex portion 187 is flush with the upper surface (including the pouring port 182) of the opening 183 of the ladle main body 181, and the width W _L0 of the general part of the ladle main body 181 is narrowed to the width W _L of the pouring port. There is. And in the ladle 18 of this embodiment, the width W _{L of the} pouring spout is set to the same dimension as the width W _R of the forming surface 126 of the casting rolls 11 and 12. Molding surface of this and equivalent size of case, note in addition to the case with the width _{W L} of the sprue and the width _{W R} of the molding surface 126 of the casting rolls 11 and 12 are equal, the pouring port wide _{W L} is the casting rolls 11, 12 The case of being smaller by about 10% than the width W _{R of} 126 is also included. That is, the relationship between the width W _{L of the} pouring spout and the width W _R of the forming surface 126 of the casting rolls 11 and 12 is preferably 0.9 W _R ≦ W _L ≦ W _R.

If the width W _L of the pouring spout is larger than the width W _R of the forming surface 126 of the casting rolls 11 and 12, the molten metal flowing out from the pouring spout 182 spreads in the width direction, and the molten metal 5 is cast with the side scout plates 143 and 144. Since there is a high possibility of scattering and sticking to the sliding portion with the rolls 11 and 12, the casting rolls 11 and 12 will stick and will not rotate at a stable peripheral speed unless cleaning etc. is performed frequently. On the other hand, if the width W _L of the pouring spout is less than 90% of the width W _R of the forming surface 126 of the casting rolls 11 and 12, the temperature distribution in the width direction of the molten metal poured into the roll gap 13 is uneven. As a result, the problems of the present invention described above arise.

That is, when the ladle 18 is inclined to cause the molten metal to flow out from the pouring port 182, the flow velocity at both ends of the pouring port 182 becomes smaller than the flow velocity at the central portion of the pouring port 182. Therefore, although the molten metal flowing out from the pouring port 182 spreads in the width direction, the convex portion 187 of this example partially increases the flow velocity of the molten metal 5 flowing out from the ladle main body 181 and flows out from the pouring port 182 It has a function to suppress the melt from spreading in the width direction. Thereby, the molten metal 5 can be prevented from scattering and adhering to the sliding portions of the side plate 143, 144 and the casting rolls 11, 12, so that the twin-roll type vertical casting apparatus 1 can be operated stably. It can be done. In addition, if the width dimension of the molten metal 5 flowing out from the pouring port 182 of the ladle 18 in the width direction is predicted in advance, and the width W _L0 of the ladle main body including the pouring port 182 is set small accordingly, the convex portion 187 can be obtained. It may be omitted.

The ladle main body 181 shown in FIGS. 10 (A) to 10 (C) is flush with the top face of the opening 183 including the pouring port 182, but another example is shown in FIGS. 12 (A) to 12 (B). As in the case of the ladle main body 181, as the upper surface of the peripheral edge of the opening 183, only the upper surface of the pouring spout 182 may be formed with a step on the lower side in the vertical direction. 12 (A) is a plan view showing another example of the ladle 18 of FIGS. 1 and 2, FIG. 12 (B) is a cross-sectional view along the line XIIB-XIIB, and the lid in FIG. 12 (A) An illustration 184 is omitted. In this case, the upper surface of the projecting portion 187, by forming the upper surface flush with the opening 183 the periphery of the non-pouring port 182, both end portions of the region from the pouring port side wall 186 up to the distal end of the pouring port 182 A bank is formed on the Thereby, when the ladle 18 is inclined and the molten metal flows out from the pouring port 182, the molten metal can be prevented from overflowing from the both ends of the pouring port 182 over the upper surface of the opening 183. It is possible to more reliably prevent the molten metal 5 from scattering and adhering to a portion where the casting roll 144 and the casting rolls 11 and 12 slide.

  As in the case of the ladle 18 shown in FIG. 12 and FIG. 13, the convex portion 187 is formed at both ends of the pouring spout 182 to increase the flow velocity at both ends of the pouring spout 182 and the molten metal flowing out from the pouring spout 182 has a width. It can be suppressed so as not to spread in the direction. 13 (A) is a plan view showing still another example of the ladle 18 of FIGS. 1 and 2, FIG. 13 (B) is a cross-sectional view taken along the line XIIIB-XIIIB, and the lid in FIG. The body 184 is not shown. The ladle main body 181 shown as another example in FIG. 13 has the convex portions 187 shown in FIG. 12 and FIG. 13 formed at both ends of the pouring spout, and from the bottom surface in the vertical direction A concave portion 188 which is concave is formed. In addition, the convex part 187 may be abbreviate | omitted in FIG. 13, and you may form only the recessed part 188 in the both ends of the pouring spout 182. FIG. By forming the recesses 188 at both ends of the pouring spout 182, when the ladle 18 is inclined and the molten metal flows out from the pouring spout 182, the flow velocity at both ends of the pouring spout 182 is slower than in the central portion. The flow rate in the department increases. Thus, the molten metal flowing out from the pouring port 182 can be suppressed from spreading in the width direction.

  The ladle 18 shown in FIG. 1 and FIG. 2 and FIG. 10 to FIG. 13 shows one in the case of performing so-called batch casting, but the ladle applicable to the present invention includes a continuous one. FIG. 14 is a side view showing the entire twin-roll vertical casting apparatus to which still another example of the ladle 18 of FIGS. 1 and 2 is applied. The twin roll type vertical casting apparatus 1 shown in FIG. 14 continuously supplies hot water to the ladle 18 with the molten metal 5 of the aluminum material melted by the melting furnace 19 and continuously from the pouring port 182 of the ladle 18 to the molten metal nozzle 14. It is an example of the type which pours the molten metal 5. Therefore, the melting furnace 19 is a molten metal holding furnace 191 which melts and holds solid raw material of aluminum material, and an electromagnetic type hot water supply which sucks the molten metal 5 of the aluminum material held in the molten metal holding furnace 191 and supplies hot water to the ladle 18 And a weir 193 for guiding the molten metal 5 drawn by the electromagnetic water heater 192 to the ladle 18.

The ladle 18 shown in FIG. 14 is fixed in position with respect to the gantry 4 and a pouring spout 182 is provided at the lower portion of the side wall of the molten metal nozzle 14. The pouring port 182 is configured in the same manner as the pouring port 182 of the ladle 18 shown in FIGS. 10 to 13 described above. In the present embodiment, the temperature detector 151 and the position detector 152 described later can be provided on the ladle 18. Even when the structure of the ladle 18 of the present invention is applied to the continuous hot water supply type twin roll vertical casting apparatus 1, the above-described effects can be obtained.

Now, FIG. 15A is a plan view showing the twin roll vertical casting apparatus 1 using the ladle 18 according to the comparative example, and FIG. 15B is a twin roll vertical type using the ladle 18 according to the comparative example shown in FIG. It is a figure which shows the result of having measured the temperature ((circle) mark) of the molten metal 5 in the center part and edge part of rotating shaft 111,121 in the casting apparatus 1, and the temperature ((black circle) mark) of casting roll 11,12. In the ladle 18 of the comparative example shown in FIG. 15A, the width W _L of the pouring port 182 is significantly smaller than the length W _R of the forming surface 126 of the pair of casting rolls 11 and 12 (W _R << W _L ) The molten metal 5 contained in the ladle 18 was poured into the molten metal nozzle 14, and the casting rolls 11, 12 were rotated to form the aluminum sheet 2. An aluminum-silicon alloy material was used as a raw material.

  As a result, as shown in FIG. 15B, the temperature of the molten metal 5 near the center, which is the dropping point of the molten metal 5 poured from the ladle 18 to the molten metal nozzle 14, is 5 ° C. compared to both ends of the casting rolls 11 and 21. It was found that the temperature difference between the casting rolls 11 and 12 was about 15 ° C. higher than that of both ends. Thus, although a temperature difference occurs in the rotational axis direction of the casting rolls 11 and 12, the peripheral velocity of the casting rolls 11 and 12 is the same at the central portion and at both ends. The solidification time of the molten metal 5 becomes long, and the solidification time of the molten metal 5 at both ends becomes short. FIG. 15C is an electron micrograph showing the cross-sectional state of the widthwise center portion of the aluminum sheet 2 manufactured by the twin roll vertical casting apparatus 1 using the ladle 18 according to the comparative example shown in FIG. 15A.

  As a result, as shown to FIG. 15C, when the cross-sectional state of the center part of the shape | molded aluminum sheet 2 is observed with an electron microscope, as shown on the right of the figure, the inside of an aluminum sheet is the center of thickness direction. It was found that many shrinkage spots and Si segregation occurred near the part. The phases of shrinkage pits and Si segregation impair the uniformity of the part strength required for the aluminum sheet 2 and also deteriorate the appearance quality by being generated on the machined surface.

  On the other hand, in the twin roll vertical casting apparatus 1 to which the ladle 18 according to the embodiment of the present invention shown in FIGS. 1 and 2 and FIGS. 10 to 14 is applied, using the same aluminum-silicon alloy material. When the aluminum sheet 2 was formed, generation of shrinkage cavities and Si segregation was remarkably suppressed as shown in FIG. 16A. FIG. 16A is an electron micrograph showing the cross-sectional state of the central portion in the width direction of the aluminum sheet 2 manufactured by the twin roll vertical casting apparatus 1 shown in FIGS. 1 and 2. 16B shows the aluminum sheet 2 manufactured by the twin roll vertical casting apparatus 1 (example) shown in FIGS. 1 and 2 and the twin roll vertical casting apparatus 1 shown in FIG. 15A (comparative example) It is an electron micrograph which shows the surface state (upper figure) and the cross-sectional state (lower figure) of each of the aluminum sheet 2 manufactured by this. As shown in FIG. 16B, in addition to the reduction of Si segregation and shrinkage, macroscopic structural uniformity was improved.

  Referring back to FIGS. 1 and 2, below the pair of casting rolls 11 and 12, a guide plate 6 is provided which guides the aluminum sheet 2 which has passed the roll gap 13 and is in a solid state substantially horizontally. A guide roller 7 and a winder 3 are provided downstream thereof. 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. 4 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 apparatus 1 of the present embodiment, wherein the twin roll system of the present embodiment In the vertical casting apparatus 1, when the molten metal 5 is injected from the ladle 18 to the molten metal nozzle 14, rotation of the pair of casting rolls 11 and 12 is started at the same time 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. 4, of the molten metal 5, 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 denoted 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 region 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. 4 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. 4 are shifted downward in the drawing, and the molten metal 51 of the liquid phase is the whole of the molten metal passing through the roll gap 13. 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.

  Therefore, in the twin-roll type vertical casting apparatus 1 of the present embodiment, the reaction force that the molten metal 5 passing through the roll gap 13 tries to push the roll gap 13 against the elastic bias of the elastic body 122 is estimated. Control the amount of heat received per unit time received from the molten metal 5 passing through the roll gap 13 by the pair of casting rolls 11 and 12 according to the reaction force estimator 15 and the reaction force estimated by the reaction force estimator 15 The control unit 16 controls the heat receiving amount per unit time to be smaller as the estimated reaction force is larger, and controls the heat receiving amount per unit time to be larger as the estimated reaction force is smaller. .

  The reaction force estimator 15 according to the present embodiment correlates the reaction force acting on the roll gap 13 with the temperature of the molten metal 5 and the position of the liquid surface of the molten metal 5 as described above, so the molten metal received by the molten metal nozzle 14 A temperature detector 151 for detecting the temperature of 5 and a position detector 152 for detecting the position of the liquid surface of the molten metal 5 received by the molten metal nozzle 14. The temperature detector 151 is composed of a thermocouple or the like, and data of the detected temperature of the molten metal 5 is read into the control unit 16 at predetermined time intervals as a detection signal. The position detector 152 is constituted by a laser type displacement sensor or the like, and the detected position data of the liquid surface of the molten metal is read into the control unit 16 as a detection signal at predetermined time intervals. Incidentally, as the reaction force estimator 15, instead of the temperature detector 151 and the position detector 152, a casting roll displacement detector 153 for measuring the displacement of the other casting roll 12 in the horizontal direction may be used.

  On the other hand, the control unit 16 controls the pair of casting rolls 11 and 12 according to the temperature of the molten metal 5 and the position of the liquid surface of the molten metal 5 respectively detected by the temperature detector 151 and the position detector 152 described above. The amount of heat received per unit time received from the molten metal 5 passing through the gap 13 is controlled, but as the control of the amount of heat received per unit time, controlling the peripheral velocity of the pair of casting rolls 11 and 12 In addition or in addition, controlling the temperature of the contact surface 113,123 of a pair of casting rolls 11 and 12 is included.

  When the amount of heat received per unit time is controlled by controlling the peripheral speeds of the pair of casting rolls 11 and 12, the control unit 16 may output a control signal to the inverter device 116, but the control map for that purpose is It is stored in the control unit 16. FIG. 5A is a graph showing a first example of the control map stored in the control unit 16 and shows the control relationship of the peripheral velocity of the casting rolls 11 and 12 with respect to the temperature of the molten metal 5 and the position of the liquid level of the molten metal 5. It is.

  As described above, when the position of the liquid surface of the molten metal 5 received by the molten metal nozzle 14 is high (the molten metal weight is large), the roll gap 13 becomes large and the position of the liquid surface is low (the molten metal weight is small) Becomes smaller. For this reason, when the position of the liquid surface of the molten metal 5 of the molten metal nozzle 14 detected by the position detector 152 is high, the circumferential speed of the casting rolls 11 and 12 is controlled large to make the roll gap 13 smaller. When the position of the liquid surface of the molten metal 5 of the molten metal nozzle 14 detected by the position detector 152 is low, the peripheral speeds of the casting rolls 11 and 12 are controlled to be small in order to enlarge the roll gap 13. This represents that the relationship between the position of the liquid surface and the peripheral velocity of the casting roll in the graph shown in FIG. 5A is a line rising to the right. However, the relationship between the position of the liquid level and the peripheral velocity of the casting rolls 11 and 12 may be obtained by collecting data in advance using an actual machine of the twin roll vertical casting apparatus 1 or by using computer simulation etc. Since the data is stored in the control unit 16, the profile of the control line shown in FIG. 5A is an example.

  As described above, when the temperature of the molten metal 5 received by the molten metal nozzle 14 is high, the roll gap 13 becomes small, and when the temperature of the molten metal 5 is low, the roll gap 13 becomes large. For this reason, when the temperature of the molten metal 5 of the molten metal nozzle 14 detected by the temperature detector 151 is high, the circumferential velocity of the casting rolls 11 and 12 is controlled to be small in order to enlarge the roll gap 13, and conversely temperature detection When the temperature of the molten metal 5 of the molten metal nozzle 14 detected by the container 151 is low, the peripheral speeds of the casting rolls 11 and 12 are controlled to be large in order to reduce the roll gap 13. In the graph shown to FIG. 5A, this shows that the circumferential velocity of a casting roll becomes high, so that the temperature of the molten metal 5 is low.

  Incidentally, the control map shown in FIG. 5A shows the relationship between the position of the liquid surface of the molten metal 5 and the peripheral velocity of the casting rolls 11 and 12 with respect to the temperature of the molten metal 5, for example, when the temperature of the molten metal 5 is 5 deg. If the temperature detected by the temperature detector 151 falls in the middle of the 5 deg interval (if it is not on the line), the peripheral velocity may be determined using interpolation processing or the like. .

  The control map shown in FIG. 5A shows the relationship between the position of the liquid surface of the molten metal 5 and the peripheral velocity of the casting rolls 11 and 12 with respect to the temperature of the molten metal 5. In this example, the peripheral speed of the casting rolls 11 and 12 is controlled according to both of the temperatures, but the peripheral speed of the casting rolls 11 and 12 is controlled according to either the position of the liquid surface of the molten metal 5 or the temperature of the molten metal 5 You may control. FIG. 5B is an example of a control map in the case of controlling the peripheral speeds of the casting rolls 11 and 12 depending only on the position of the liquid level of the molten metal 5, and FIG. 5C shows the casting roll 11 only according to the temperature of the molten metal 5. , 12 is an example of a control map in the case of controlling the circumferential speed.

  In FIG. 6, when the position of the liquid surface of the molten metal 5 detected by the position detector 152 is read into the control unit 16 and the temperature of the molten metal 5 is constant, the peripheral speed of the casting rolls 11 and 12 is measured by the control unit 16 It is a graph which shows the Example which measured the displacement of the roll gap 13 at the time of controlling. The dotted line in the figure shows, as a comparative example, the displacement of the roll gap 13 when the peripheral speeds of the casting rolls 11, 12 are controlled to be constant regardless of the position of the liquid surface of the molten metal.

  As shown in FIG. 6, when the position of the liquid surface of the molten metal 5 becomes lower than the predetermined value H0 at time T1 to T2 after the start of casting, the circumference of the casting rolls 11, 12 as in the comparative example. When the speed is maintained at the predetermined value V0, the roll gap 13 is significantly smaller than the predetermined value G0, as indicated by the dotted line in the comparative example. On the other hand, in the embodiment, the control unit 16 controls the peripheral speeds of the casting rolls 11 and 12 to be smaller than the predetermined value V0 in response to the position of the liquid surface of the molten metal 5 being lower than the predetermined value H0. The roll gap 13 does not become much smaller than the predetermined value G0.

  Also, when the position of the liquid surface of the molten metal 5 rises from the predetermined value H0 at time T2 to T3 after the start of casting, the peripheral speeds of the casting rolls 11, 12 are set to the predetermined value V0 as in the comparative example. , The roll gap 13 becomes much larger than the predetermined value G0, as indicated by the dotted line in the comparative example. On the other hand, in the embodiment, the control unit 16 controls the peripheral speeds of the casting rolls 11 and 12 to be larger than the predetermined value V0 in response to the position of the liquid surface of the molten metal 5 becoming higher than the predetermined value H0. The roll gap 13 does not become much larger than the predetermined value G0.

  In FIG. 7, when the temperature of the molten metal 5 detected by the temperature detector 151 is read into the control unit 16 and the position of the liquid surface of the molten metal 5 is constant, the peripheral unit of the casting rolls 11, 12 is controlled by the control unit 16 It is a graph which shows the Example which measured the displacement of the roll gap 13 at the time of controlling. The dotted line in the figure shows, as a comparative example, the displacement of the roll gap 13 when the peripheral speeds of the casting rolls 11, 12 are controlled to be constant regardless of the temperature of the molten metal.

  As shown in FIG. 7, when the temperature of the molten metal 5 drops from the predetermined value t0 in time T1 to T2 after the start of casting, the peripheral speeds of the casting rolls 11 and 12 are specified as in the comparative example. When the roll gap 13 is maintained at the value V0, the roll gap 13 is significantly smaller than the predetermined value G0, as indicated by the dotted line in the comparative example. On the other hand, in the embodiment, the control unit 16 controls the peripheral speed of the casting rolls 11 and 12 to be larger than the predetermined value V0 in response to the temperature of the molten metal 5 becoming lower than the predetermined value t0. Does not become significantly smaller than the predetermined value G0.

  When the temperature of molten metal 5 rises from predetermined value t0 during time T2 to T3 from the start of casting, the circumferential speed of casting rolls 11, 12 is maintained at predetermined value V0 as in the comparative example. The roll gap 13 is much larger than the predetermined value G0, as indicated by the dotted line in the comparative example. On the other hand, in the embodiment, the control unit 16 controls the peripheral speed of the casting rolls 11 and 12 to be smaller than the predetermined value V0 in response to the temperature of the molten metal 5 rising from the predetermined value t0. Does not become significantly larger than the predetermined value G0.

  As described above, in the twin-roll type vertical casting apparatus 1 of the present embodiment, the reaction force that the molten metal 5 passing through the roll gap 13 tries to push the roll gap 13 against the elastic bias of the elastic body 122. In accordance with the reaction force estimated by the reaction force estimator 15 that estimates the temperature, specifically, the temperature detector 151 that detects the temperature of the molten metal 5 and / or the position sensor 152 that detects the position of the liquid surface of the molten metal 5 Since the heat receiving amount of the pair of casting rolls 11, 12 and specifically the peripheral speed of the pair of casting rolls 11, 12 are controlled, fluctuation of the heat receiving amount at the contact surfaces 113, 123 of the pair of casting rolls 11, 12 Becomes smaller and fluctuations in the solidification speed of the molten metal become smaller, as a result, the roll gap 13 becomes stable. Thereby, the uniformity of the thickness t and the finished quality of the surface and the inner surface can be maintained at a certain value or more.

  As described above, according to the temperature of the molten metal 5 detected by the temperature detector 151 and the position detector 152 and the position of the liquid surface of the molten metal 5, the control unit 16 has the pair of casting rolls 11 and 12. The amount of heat received per unit time received from the molten metal 5 passing through the roll gap 13 is controlled. As control of the amount of heat received per unit time, as shown in FIG. 5A to FIG. Besides controlling the peripheral speed, controlling the temperature of the contact surface 113, 123 of the pair of casting rolls 11, 12 is included. Below, by controlling the temperatures of the contact surfaces 113 and 123 of the pair of casting rolls 11 and 12, 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 is controlled. An example will be described. This control can be executed instead of or in addition to the control of the peripheral speeds of the casting rolls 11 and 12 described above.

  Each of the pair of casting rolls 11 and 12 of the present embodiment includes a temperature controller 17 that adjusts the temperature of at least the contact surfaces 113 and 123 of the casting rolls with which the molten metal 5 contacts, and the temperature controller 17 at least contacts A circulation system 171 of a heat medium for heating or cooling the surfaces 113 and 123, a flow controller 172 for adjusting the flow rate of the heat medium, and a medium temperature controller 173 for adjusting the temperature of the heat medium ing. The heat medium may be in contact with at least the back surfaces of the contact surfaces 113 and 123 of the pair of casting rolls 11 and 12, but as described above, it is configured to circulate a part or all of the inside of the hollow cylindrical bodies 114 and 124. You may The heat medium is in contact with at least the back surfaces of the contact surfaces 113 and 123 of the pair of casting rolls 11 and 12 and heats or cools the temperatures of the contact surfaces 113 and 123. It may be cooling water.

  The medium temperature controller 173 includes a heater, a cooler, a heat exchanger, etc., which heats or cools the heat medium returned by circulating through the pair of casting rolls 11, 12, and cooling when the heat medium is a refrigerant And heat exchangers for heating. Further, the flow rate regulator 172 is composed of a flow rate control valve and the like. The flow rate regulator 172 and the medium temperature regulator 173 are controlled by a control signal from the control unit 16.

  Then, as the reaction force estimated by the reaction force estimator 15 including the temperature detector 151 and the position detector 152 is larger, at least the contact surfaces 113 and 123 are heat-controlled by the temperature controller 17 so that reception per unit time can be performed. The heat amount is controlled to be small, and the heat receiving amount per unit time is controlled to be large by controlling the cooling of at least the contact surfaces 113 and 123 by the temperature controller 17 as the estimated reaction force is smaller. When the heat medium is a refrigerant (cooling water), the flow controller 172 controls the flow rate of the cooling water more as the temperature of the molten metal 5 detected by the temperature detector 151 becomes higher. The amount of heat received is controlled to be small by controlling the amount of heat per unit time small by controlling the amount of heat large and reducing the flow rate of the cooling water by the flow rate regulator 172 as the temperature of the molten metal 5 is lower. By controlling the flow rate of the cooling water by the flow rate regulator 172 to be smaller as the position of the liquid level is higher, the amount of heat received per unit time is controlled smaller, and as the position of the liquid level is lower, the flow rate of the cooling water by the flow rate regulator 172 The amount of heat received per unit time is controlled to a large extent by controlling.

  Since the solidification speed of the molten metal in the roll gap 13 is faster as the reaction force estimated by the reaction force estimator 15 is larger, at least the contact surfaces 113 and 123 are heat-controlled by the temperature controller 17 to suppress the solidification speed later. . Moreover, since the solidification speed of the molten metal in the roll gap 13 is slower as the reaction force estimated by the reaction force estimator 15 is smaller, the solidification speed is increased by performing cooling control of at least the contact surfaces 113 and 123 by the temperature controller 17. Suppress.

  As described above, in the twin-roll type vertical casting apparatus 1 of the present embodiment, the reaction force that the molten metal 5 passing through the roll gap 13 tries to push the roll gap 13 against the elastic bias of the elastic body 122. In accordance with the reaction force estimated by the reaction force estimator 15 that estimates the temperature, specifically, the temperature detector 151 that detects the temperature of the molten metal 5 and / or the position sensor 152 that detects the position of the liquid surface of the molten metal 5 Control the heat received by the pair of casting rolls 11, 12 and specifically the temperatures of the contact surfaces 113, 123 of the pair of casting rolls 11, 12 so that the contact between the pair of casting rolls 11, 12 is controlled. Fluctuations in the amount of heat received on the surfaces 113 and 123 become smaller, and fluctuations in the solidification speed of the molten metal become smaller, as a result, the roll gap 13 becomes stable. Thereby, the uniformity of the thickness t and the finished quality of the surface and the inner surface can be maintained at a certain value or more.

  Note that controlling the amount of heat received according to the above-described reaction force estimator 15 is not only in the middle of casting but also at the beginning of casting and the end of casting in batch casting such as the twin roll vertical casting apparatus 1 of this embodiment. Also exerts its effect.

  That is, in the initial stage of casting, a fixed amount of molten metal 5 is injected from ladle 18 to molten metal nozzle 14 at a predetermined flow rate (flow rate per unit time), but the liquid level of molten metal 5 reaches a predetermined position after starting injection. Since the liquid level of the molten metal 5 gradually rises until the heat receiving amount received from the molten metal by the pair of casting rolls 11 and 12 during this period is made constant, specifically, the circumferential speed of the pair of casting rolls 11 and 12 is If fixed, as shown in the comparative example on the left side of FIG. 8, the roll gap 13 also narrows at the beginning and gradually widens as the liquid surface of the molten metal 5 rises. For this reason, the thickness t of the aluminum sheet 2 at the early stage of casting becomes thinner than the target thickness, and can not be used for the intended purpose and must be discarded.

  On the other hand, as shown in the example of the right figure of FIG. 8, if peripheral velocity of a pair of casting rolls 11 and 12 is controlled large gradually according to the position of the liquid level of molten metal 5, in other words, By setting the peripheral speeds of the pair of casting rolls 11, 12 at the initial stage of casting small and controlling them so as to gradually increase from here, the time until the roll gap 13 stabilizes at a predetermined value is shortened. Discard length is shortened. In this case, the position of the liquid surface of the molten metal 5 may be detected by the position detector 152, but the volume of the molten metal nozzle 14 and the flow velocity when pouring from the ladle 18 to the molten metal nozzle 14 are known. Then, it is possible to calculate the time until the position of the liquid surface reaches a predetermined height after pouring starts. Therefore, the circumferential speed of the pair of casting rolls 11 and 12 may be controlled based on the time from the start of pouring instead of the position detector 152.

  Further, in addition to controlling the peripheral velocity of the pair of casting rolls 11 and 12 in the initial stage of casting small depending on the position of the liquid surface of the molten metal 5 or the time from the start of casting, the temperature of the molten metal 5 The peripheral speed of the pair of casting rolls 11 and 12 may be controlled using the detected and detected molten metal temperature and the control map shown in FIG. 5A. Even at the beginning of casting, the peripheral speed of the pair of casting rolls 11 and 12 is controlled to be smaller as the detected temperature of the molten metal increases, and the peripheral speed of the pair of casting rolls 11 and 12 is controlled to increase as the temperature of the molten metal decreases. .

  Furthermore, the temperature adjuster 17 may be used to control heating or cooling of the contact surface of the pair of casting rolls 11 and 12. That is, at the initial stage of casting, since the reaction force estimated by the reaction force estimator 15 including the temperature detector 151 and the position detector 152 is relatively small, the temperature controller 17 performs cooling control of at least the contact surfaces 113 and 123. This greatly controls the amount of heat received per unit time. In the case where the heat medium is a refrigerant (cooling water), the flow control unit 172 controls the flow rate of the cooling water to a large amount at the initial stage of casting to greatly control the amount of heat received per unit time.

  Similarly, in the final stage of casting, the liquid surface of the molten metal 5 injected into the molten metal nozzle 14 gradually descends from the predetermined position, so if the amount of heat received from the molten metal by the pair of casting rolls 11 and 12 is made constant, Specifically, when the peripheral speeds of the pair of casting rolls 11 and 12 are constant, the roll gap 13 also gradually narrows as the liquid surface of the molten metal 5 descends, as shown in the comparative example on the left side of FIG. For this reason, the thickness t of the aluminum sheet 2 at the end of casting becomes thinner than the target thickness, and can not be used for the intended purpose and must be discarded.

  On the other hand, as shown in the embodiment of the right figure of FIG. 9, if the circumferential speed of the pair of casting rolls 11 and 12 is controlled to be smaller gradually as the position of the liquid surface of the molten metal 5 descends, It takes a long time for the roll gap 13 to maintain the predetermined value, and the disposal length of the aluminum sheet 2 becomes short. In this case, although the position of the liquid surface of the molten metal 5 may be detected by the position detector 152, the volume of the molten metal nozzle 14 and the flow velocity of the molten metal discharged from the molten metal nozzle 14 are known. The time from when the position of the liquid level starts to descend from the predetermined height to when the molten metal disappears can be calculated. Therefore, the circumferential speed of the pair of casting rolls 11 and 12 may be controlled based on the time from the start of the descent of the position of the liquid surface of the molten metal 5 instead of the position detector 152.

  Further, in addition to controlling the peripheral velocity of the pair of casting rolls 11 and 12 at the end of casting depending on the position of the liquid surface of the molten metal 5 or the time from the start of descent, the temperature of the molten metal 5 is detected by the temperature detector 151. The peripheral speed of the pair of casting rolls 11 and 12 may be controlled using the detected and detected molten metal temperature and the control map shown in FIG. 5A. Even at the end of casting, the peripheral speed of the pair of casting rolls 11 and 12 is controlled to be smaller as the detected temperature of the molten metal is higher, and the peripheral speed of the pair of casting rolls 11 and 12 is controlled to be larger as the temperature of the molten metal is lower. .

  Furthermore, the temperature adjuster 17 may be used to control heating or cooling of the contact surface of the pair of casting rolls 11 and 12. That is, at the end of casting, since the reaction force estimated by the reaction force estimator 15 including the temperature detector 151 and the position detector 152 is relatively small, the temperature controller 17 performs cooling control of at least the contact surfaces 113 and 123. This greatly controls the amount of heat received per unit time. In the case where the heat medium is a refrigerant (cooling water), the flow control unit 172 controls the flow rate of the cooling water to a large amount at the initial stage of casting to greatly control the amount of heat received per unit time.

As described above, according to the twin-roll vertical casting apparatus 1 of the present embodiment, the width W _L of the pouring port 182 of the ladle 18 is equal to the axial length W of the forming surface 126 of the pair of casting rolls 11 and 12 _Since it was made equivalent to _R (preferably, 0.9 W _R ≦ W _L ≦ W _R ), when the molten metal 5 is poured from the ladle 18 through the molten metal nozzle 14 into the roll gap 13 of the pair of casting rolls 11 and 12, The molten metal 5 is poured from the ladle 18 to the molten metal nozzle 14 with a width equal to the axial length W _R of the forming surface 126 of the pair of casting rolls 11 and 12. Thereby, since the heat input to the casting rolls 11 and 12 becomes uniform in the axial direction, the finished quality of the aluminum sheet 2 can be maintained at a certain value or more.

  Further, in the double-roll type vertical casting apparatus 1 of the present embodiment, convex portions 187 which are convex toward the center in plan view are provided at both end portions of the pouring spout 182, thereby making the molten metal 5 flow out of the ladle main body 181. The flow velocity can be partially increased, and the molten metal flowing out from the pouring port 182 can be suppressed from spreading in the width direction. Thereby, the molten metal 5 can be prevented from scattering and adhering to the sliding portions of the side plate 143, 144 and the casting rolls 11, 12, so that the twin-roll type vertical casting apparatus 1 can be operated stably. It can be done.

  Further, in the double-roll type vertical casting apparatus 1 of the present embodiment, the ladle 18 is inclined and the molten metal flows out from the pouring port 182 by providing the recess 188 which is recessed from the bottom in the vertical direction at both ends of the pouring port 182. In the latter case, the flow velocity at both ends of the pouring spout 182 is slower than that at the center, but the flow rate of the molten metal 5 at both ends is increased. Thus, the molten metal flowing out from the pouring port 182 can be suppressed from spreading in the width direction. As a result, since the molten metal 5 can be prevented from scattering and adhering to the sliding portion of the side plate 143, 144 and the casting rolls 11, 12, the twin-roll type vertical casting apparatus 1 can be operated stably. It can be done.

DESCRIPTION OF SYMBOLS 1 ... Double roll type vertical casting apparatus 11 ... Casting roll 111 ... Rotary shaft 112 ... Rotation drive motor 113 ... Contact surface with a molten metal 114 ... Hollow cylindrical body 115 ... Metal layer 12 ... Casting roll 121 ... Rotary shaft 122 ... Elasticity Body 123 Contact surface with molten metal 124 Hollow cylinder 125 Metal layer 126 Molding surface W _R Length of molding surface in the direction of rotation axis 13 Roll gap 14 Molten metal nozzle 141, 142 Main cover plate 143 , 144 ... side plate 145, 146 ... pressing elastic body 147 ... tension elastic body 15 ... reaction force estimator 151 ... temperature detector 152 ... position detector 153 ... casting roll displacement detector 16 ... control unit 17 ... temperature controller 171 ... circulation system 172 ... flow controller 173 ... medium temperature controller 18 ... ladle (ladle)
181: Ladle body 182: Pouring port 183: Opening 184: Lid body 185: Hinge 186: Pouring side wall 187: Convex part 188: Recess W _L : Pouring port width 19: Melting furnace 191: Molten metal holding furnace 192: Electromagnetic Type water heater 193 ... 樋 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 ... Liquid phase Molten metal 52 ... Molten metal coexisting solid / liquid 53 ... Solid phase molten metal (sheet)
6 Guide plate 7 Guide roller

Claims (8)

A twin roll vertical casting apparatus for producing an aluminum-based material into a sheet, comprising:
The molding surfaces are disposed opposite to each other with a predetermined roll gap, rotate at equal circumferential speeds about mutually parallel rotation axes, and are elastically urged in a relatively approaching direction, and form a molding surface of a predetermined length in the rotation axis direction. A pair of casting rolls,
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 a fixed amount of aluminum-based material is poured;
The ladle main body for containing the molten metal of the aluminum-based material, the pouring port for pouring the molten metal from the ladle main body to the molten metal nozzle, and both ends of the pouring gate have a convex toward the center in plan view, a ladle for chromatic and protrusions sprue width of narrowed than the width of the ladle body, twin-roll vertical casting apparatus comprising a. The twin-roll type vertical casting apparatus according to claim 1, wherein the ladle has concave portions which are recessed with respect to the bottom surface of the ladle main body in the vertical direction at both end portions of the pouring spout. Assuming that the predetermined length of the forming surface is WR and the width of the pouring spout is WL,
The twin roll vertical casting apparatus according to claim 1 or 2 , wherein 0.9 WR WL WL WR WR. A reaction force estimator that detects a detection value indicating a reaction force that causes the molten metal passing through the roll gap to push the roll gap open against the elastic bias;
A control unit configured to control the amount of heat received per unit time received from the molten metal passing through the roll gap by the pair of casting rolls in accordance with the detected value ;
The control unit controls the amount of heat received per unit time to be smaller as the reaction force represented by the detected value is larger, and controls the amount of heat received per unit time larger as the reaction force represented by the detected value is smaller. The twin roll vertical casting apparatus according to any one of claims 1 to 3 . The control unit controls the peripheral speed of the pair of casting rolls to be larger as the reaction force indicated by the detected value is larger, and the peripheral speed of the pair of casting rolls is decreased as the reaction force indicated by the detected value is smaller. The twin roll vertical casting apparatus according to claim 4 , wherein the control is performed. The reaction force estimator
Including a temperature detector for detecting the temperature of the melt received by the melt nozzle;
The control unit
It is determined that the reaction force is smaller as the temperature of the molten metal detected by the temperature detector is higher, and the peripheral velocity of the pair of casting rolls is controlled to be smaller, and the reaction force is larger as the temperature of the molten metal is lower. The twin-roll type vertical casting apparatus according to claim 5 , wherein the peripheral speeds of the pair of casting rolls are controlled to a large extent. The reaction force estimator
A position detector for detecting the position of the liquid surface of the molten metal received by the molten metal nozzle;
The control unit
It is determined that the higher the reaction force the position of the liquid surface of the molten metal that has been detected by the position detector is large, the increased control peripheral speed of the pair of casting rolls, wherein the anti lower the position of the liquid surface The twin roll type vertical casting apparatus according to claim 5 or 6 , wherein the circumferential velocity of the pair of casting rolls is controlled to be small, judging that the force is small . The molding surfaces are disposed opposite to each other with a predetermined roll gap, rotate at equal circumferential speeds about mutually parallel rotation axes, and are elastically urged in a relatively approaching direction, and form a molding surface of a predetermined length in the rotation axis direction. In the roll gap of the pair of casting rolls having
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,
Storing the molten metal of the aluminum-based material in a ladle body of a ladle having a pouring port ;
Wherein the ladle the molten metal contained in the main body, the melt nozzle, twin-roll type vertical width by the convex portion provided includes a step of pouring from the pouring port which is narrower than the ladle body at both ends Die casting method.