JP6512042B2 - Twin roll vertical casting machine - Google Patents

Description

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

  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 type vertical casting apparatus capable of suppressing foreign matter generated from a side plate from being mixed in a cast product.

The present invention is a twin roll type vertical casting in which molten metal is poured into a molten metal nozzle while rotating a pair of casting rolls, the lower end edge of the side weir plate is in contact with the cylindrical peripheral surface of the casting roll or a slight clearance And an auxiliary side cover plate covering at least the portion where the lower end edge of the side cover plate and the cylindrical peripheral surface of the casting roll face each other and the range including the roll gap The above-mentioned subject is solved by pressing on the side plate and the end face of the casting roll .

In the present invention, the lower end edge of the side weir plate is disposed in contact with the cylindrical peripheral surface of the casting roll or with a slight gap, so that the main surface of the side weir plate and the end face of the casting roll do not slide. It becomes. Therefore, there is no need to coat the inner surface of the side plate with a flexible coating material. As a result, the side weir plate can be made of a hard material having wear resistance and / or peeling resistance and heat resistance, so that the generation of foreign matter from the side weir plate due to heat load, erosion and wear by the molten metal is suppressed. It is possible to suppress this from being mixed into the cast product. In addition, since the auxiliary side covering plate covers the portion where the lower end edge of the side covering plate faces the cylindrical peripheral surface of the casting roll and the range including the roll gap, the lower end edge of the side covering plate is the casting roll Leakage of the molten metal can be additionally sealed even if it contacts the cylindrical peripheral surface or is disposed with a slight gap.

It is a side view showing a 1st 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 the main structure part of FIG. It is a side view showing a 2nd 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 the main structure part of FIG. It is sectional drawing which shows the main structure parts of FIG.1 and FIG.4. FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIGS. 2 and 5; It is a side view of the principal composition part showing a 3rd embodiment of a twin roll type vertical casting device concerning the present invention. FIG. 10 is a cross-sectional view taken along the line XX in FIG. It is front sectional drawing (it corresponds to the cross section which follows the XI-XI line of FIG. 2) which shows 4th Embodiment of the twin roll type | mold vertical casting apparatus which concerns on this invention. It is a side view (XII arrow line view of FIG. 11) of the main structure part of FIG.

<< Configuration of First Embodiment >>
FIG. 1 is a side view showing a first embodiment of a twin roll vertical casting apparatus according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a casting roll 11 which is a main component of FIG. , 12 and the molten metal nozzle 14 are exploded perspective views. 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 it is a casting apparatus for manufacturing in the aluminum sheet 2 of predetermined length L. FIG. 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. 1 and FIG. 2, the reaction force is assumed 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 reaction force estimator, and 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 according to the reaction force estimated by the reaction force estimator; May be provided. As shown in FIG. 2, the pair of casting rolls 11 and 12, the molten metal nozzle 14, and the ladle 15 are arranged 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 elastically biased by an elastic body 122 such as a spring or a fluid pressure cylinder in a direction toward one casting roll 11, but the roll gap 13 at the closest position is the target aluminum The predetermined value exceeding zero according to the thickness t of the sheet 2 is set to, for example, 0.5 to 3 mm 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. 1, 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 cylindrically mold metal plates 115 and 125 made of copper or the like having good thermal conductivity, and hubs 114 and 124 fixed to both end portions of the rotating shafts 111 and 121, respectively. It is constituted by fixing to. The cylindrical outer peripheral surfaces of the casting rolls 11 and 12 are referred to as cylindrical peripheral surfaces 117 and 127. 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 or integrated 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. As shown in FIG. 3, the molten metal nozzle 14 according to the first embodiment is a rectangular cylindrical body in which a pair of main cover plates 141 and 142 and a pair of side cover plates 143 and 144 are joined integrally and fluid tight in advance. In contrast, as shown in FIG. 6, the molten metal nozzle 14 according to the second embodiment, which will be described later, is a separate body from the pair of main cover plates 141 and 142 and the pair of side cover plates 143 and 144. , And is an embodiment of a rectangular cylindrical body closely contacted by using the pressing elastic bodies 145 and 146, the tension elastic body 147 and the like (see FIGS. 4 and 5).

  The pair of main guide plates 141 and 142 and the pair of side guide plates 143 and 144 integrated in the present embodiment are both made of 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 hard heat insulating material layer having the same heat resistance is formed on the surface (at least the inner surface surrounded by the main cover plate and the side cover plate). And a pair of main wedge board 141,142 is formed in the shape of a rectangle, and the lower end contacts the cylindrical peripheral surface 117,127 of a pair of casting rolls 11 and 12 mentioned above, or opens a slight gap, and is provided .

  On the other hand, as shown in FIGS. 1 to 3, the pair of side weir plates 143 and 144 has a shape similar to a feather plate, and the upper portions thereof are rectangular like the main weir plates 141 and 142. The pair of curved edge portions 1431 and 1414 formed into a circular shape corresponding to the circular shape of the cylindrical peripheral surfaces 117 and 127 of the casting rolls 11 and 12 and the pair of curved surfaces The lower ends of the edge portions 1431 and 1414 are connected to each other, and have at least a horizontally extending horizontal edge portion 1432 and 1442, and the diameter is reduced toward the lower end. The lower ends of the pair of side anchor plates 143 and 144, that is, the curved edge portions 1431 and 1414 are provided in contact with the cylindrical peripheral surfaces 117 and 127 of the pair of casting rolls 11 and 12 or with a slight gap. Here, horizontal edges 1432 and 1442 which are lower ends of the side cover plates 143 and 144 have lengths that extend at least to the position of the roll gap 13 when the molten metal nozzle 14 is set at the normal position. However, the horizontal edges 1432 and 1442 of the side weir plates 143 and 144 may extend to the lower side of the roll gap 13. In this case, it is sufficient to provide a linear edge extending in the vertical direction between the lower ends (ends of the circles) of the curved edges 1431 and 1414 of the side weir plates 143 and 144 and the horizontal edges 1432 and 1442. .

When the lower ends of the pair of side anchor plates 143 and 144, that is, the curved edges 1431 and 1414 are provided in contact with the cylindrical peripheral surfaces 117 and 127 of the pair of casting rolls 11 and 12 or with a slight gap, , 126 are preferably provided at the end of the cylindrical peripheral surface 117, 127 as much as possible. The width of the forming surfaces 116 and 126 is indicated by W _M in FIG. As shown in FIGS. 2 and 8, continuous annular members 118 and 128 protrude from the cylindrical peripheral surfaces 117 and 127 at both ends of the cylindrical peripheral surfaces 117 and 127 of the casting rolls 11 and 12 of the present embodiment. Provided in FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. The lower ends of the pair of side anchor plates 143 and 144, that is, the curved edges 1431 and 1414 are provided so as to be in contact with the insides of the annular members 118 and 128. Thereby, the inner side surfaces of the annular members 118 and 128 also contribute to the sealability between the cylindrical peripheral surfaces 117 and 127 of the casting rolls 11 and 12 and the curved edge portions 1431 and 1414 of the side weir plates 143 and 144. Therefore, the molten metal 5 is better suppressed from leaking between the cylindrical peripheral surfaces 117 and 127 of the casting rolls 11 and 12 and the curved edge portions 1431 and 1414 of the side weir plates 143 and 144 in the direction of the rotating shaft 111 or 121. be able to. In the twin-roll type vertical casting apparatus 1 of the present invention, the provision of the annular members 118 and 128 is not essential, and the lower end of the pair of side weir plates 143 and 144 is the cylindrical peripheral surface of the pair of casting rolls 11 and 12 The molten metal 5 is brought into contact with 117, 127, etc., and the direction of the rotary shaft 111, 121 from between the cylindrical peripheral surfaces 117, 127 of the casting rolls 11, 12 and the curved edge portions 1431, 1414 of the side weir plates 143, 144. If leakage can be prevented, this may be omitted.

  As described above, when casting of the pair of casting rolls 11 and 12 is started, the other casting roll 12 made movable is moved to the left in FIG. 1 by the molten metal 5, and the roll gap 13 is pushed apart. When casting is finished, it returns to the original position. It is necessary to move the molten metal nozzle 14 so as to follow this movement. That is, since the molten metal nozzle 14 of the present embodiment is a rectangular cylindrical body in which the pair of main anchor plates 141 and 142 and the pair of side anchor plates 143 and 144 are integrated, the entire molten metal nozzle 14 is shown in FIG. It needs to be supported so as to be movable in the left and right direction and in the vertical direction. For this reason, as shown in FIGS. 1 and 2, in the molten metal nozzle 14 of the present embodiment, the tensile elastic bodies 147 and 148 whose proximal ends are fixed to the gantry 4 on the pair of main anchor plates 141 and 142 respectively. Is provided. The molten metal nozzle 14 follows the fluctuation of the roll gap 13 by the tensile elastic members 147 and 148 and the weight of the molten metal nozzle 14, and the lower end of the main cover plate 141 and 142 and the curved edge 1431 of the side cover plate 143 and 144. 1441 contacts the cylindrical circumferential surfaces 117 and 127 of the pair of casting rolls 11 and 12 or maintains a slight gap. The position in the width direction of the molten metal nozzle 14, that is, the position in the vertical direction (the rotation axis direction of the casting rolls 11 and 12) shown in FIG. 2 is positioned by the annular members 118 and 128. It is not necessary to provide the pressing elastic bodies 145 and 146 in the form. However, when the annular members 118 and 128 are omitted, it is desirable to provide the pressing elastic bodies 145 and 146 of the second embodiment.

  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. 1 and FIG. 2 shows the case of performing casting by a so-called batch method, 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.

<< Configuration of Second Embodiment >>
Next, a second embodiment of the twin roll vertical casting apparatus 1 according to the present invention will be described with reference to FIGS. 4 is a side view showing a second embodiment of the twin roll vertical casting apparatus according to the present invention, FIG. 5 is a plan view of FIG. 4, and FIG. 6 is a casting roll 11 which is a main component of FIG. , 12 and the molten metal nozzle 14 are exploded perspective views. As described above, the twin roll vertical casting apparatus 1 of the second embodiment is different from the twin roll vertical casting apparatus 1 of the first embodiment in the component configuration of the molten metal nozzle 14, specifically, The pair of main anchor plates 141, 142 and the pair of side anchor plates 143, 144 are respectively constituted by separate parts, and use the pressing elastic bodies 145, 146, the tension elastic body 147, etc. (see FIGS. 4 and 5) The difference is that it is a close-packed rectangular cylinder. However, the shapes and materials of the main cover plates 141 and 142 and the side cover plates 143 and 144, and the other configurations not specifically described below are the same as the configuration of the first embodiment. Therefore, about the member and structure which are the same as 1st Embodiment, the same code | symbol as FIGS. 1-3 is attached | subjected to FIGS. 4-6, and the description shall be used here.

  The molten metal nozzle 14 of the present embodiment, as shown in FIGS. 4 and 5, includes a pair of main cover plates 141 and 142 disposed opposite to each other in parallel with the rotating shafts 111 and 121 of the pair of casting rolls 11 and 12; It is configured to include a pair of side weir plates 143 and 144 which are disposed to face each other at right angles to the shafts 111 and 121 and in close contact with both end faces of the pair of main weir plates 141 and 142. That is, although the molten metal nozzle 14 of the present embodiment is a rectangular cylinder having four side surfaces and the upper surface and the lower surface opened respectively, it differs from the molten metal nozzle 14 of the first embodiment shown in FIG. As shown in FIG. 6, the pair of main cover plates 141 and 142 and the pair of side cover plates 143 and 144 are respectively configured by separate parts, that is, four parts.

  When casting of the pair of casting rolls 11 and 12 is started, the other casting roll 12 made movable is moved to the left in FIG. 1 by the molten metal 5, and the roll gap 13 is pushed out to finish casting. Then it returns to the original position. It is necessary to move the molten metal nozzle 14 so as to follow this movement. Since the molten metal nozzle 14 of the present embodiment is configured of four parts, it is configured as follows. That is, the main weir plate 142 provided in contact with the contact surface 113 of the non-movable one of the casting rolls 11 with a slight gap or contact is fixed in position with respect to the gantry 4 although not shown.

  On the other hand, a tension elastic body 147 whose base end is fixed to the gantry 4 is provided on the main weir plate 141 provided in contact with the contact surface 123 of the other movable casting roll 12 or with a slight gap. It is done. Thus, when the other casting roll 12 moves to the left in the horizontal direction of FIG. 4 with respect to the gantry 4 (when the roll gap 13 expands), the tension force of the tensile elastic body 147 also causes the main weir plate 141 to be horizontal as shown in FIG. Move to the left of the direction. Conversely, when the other casting roll 12 moves to the right in the horizontal direction of FIG. 4 with respect to the gantry 4 (when the roll gap 13 narrows), the main wedge plate 141 is also shown against the tensile force of the tensile elastic body 147. Move to the right of 4 horizontal direction. As a result, contact or a slight gap between the lower end of the main weir plate 141 and the contact surface 123 of the other casting roll 12 is maintained.

  Further, as shown in FIG. 5, pressing elastic bodies 145 and 146 whose proximal ends are fixed to the gantry 4 are provided on the side weir plates 143 and 144. When the other movable casting roll 12 moves to the left in the horizontal direction of FIG. 4 with respect to the gantry 4 (when the roll gap 13 expands), the side weir plates 143 and 144 are moved by the main weir plate 141 by their own weight. , 142 and move to the left side and the lower side in the horizontal direction of FIG. Conversely, when the other casting roll 12 moves to the right in the horizontal direction of FIG. 4 with respect to the gantry 4 (when the roll gap 13 narrows), the side weir plates 143 and 144 are mainly covered by the casting rolls 11 and 12 In close contact with the edge of the plates 141, 142, it moves to the right and to the upper side in the horizontal direction of FIG. Thereby, the contact or slight gap between the lower ends of the side weir plates 143 and 144 and the cylindrical peripheral surfaces 117 and 127 of the pair of casting rolls 11 and 12 is maintained.

<< Casting Action of First and Second Embodiments >>
FIG. 7 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. Although FIG. 7 displays the side covering plates 143 and 144 according to the first embodiment and the second embodiment described above in an overlapping manner, it does not affect the operation and effects described later.

  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. 7, among 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 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. 7 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. 7 are shifted downward in the same drawing, and the molten metal 51 of the liquid phase is the entire 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.

  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 operation will be described.
In the case of casting the aluminum sheet 2 using the twin-roll vertical casting apparatus 1 of the present embodiment, the molten metal nozzle from the ladle 15 is started at the same time or with a slight time lag when the pair of casting rolls 11, 12 starts rotating. The molten metal 5 is poured into 14. The molten metal 5 injected into the molten metal nozzle 14 is, as shown in FIG. 7, from a point P1 intersecting the central horizontal line of the roll gap 13 to a point P2 provided in contact with the main base 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 the casting process using the twin-roll type vertical casting apparatus 1 of the present embodiment, the inner surface of the side weir plates 143 and 144 does not slide with the end face of the casting rolls 11 and 12, but the side weir plate 143, The lower curved edges 1431 and 1414 of 144 slide between the cylindrical peripheral surfaces 117 and 127 of the casting rolls 11 and 12 or do not even slide if they are installed with a small distance. Therefore, peeling of the surface layer of the side weir plate 143, 144 due to the sliding with the end face of the casting rolls 11, 12 is prevented. In addition, since a hard heat insulating material layer having heat resistance is formed on at least the surface surface of the side covering plates 143 and 144, wear of the surface side surface of the side covering plates 143 and 144 by the molten metal 5 is suppressed. Alternatively, mixing of the member peeled off from the surface layer with the produced aluminum sheet 2 is suppressed.

Third Embodiment
Next, still another embodiment of the twin roll vertical casting apparatus according to the present invention will be described. FIG. 9 is a side view of the main components showing a third embodiment of the twin roll vertical casting apparatus according to the present invention, and FIG. 10 is a sectional view taken along the line XX in FIG. Hereinafter, the same reference numerals as in the specification and the drawings are attached to the same constituent members as those of the twin roll vertical casting apparatus 1 according to the first embodiment and the second embodiment described above, and all or a part of the description thereof will be described. I omit it.

  In the twin roll type vertical casting apparatus 1 according to the first embodiment and the second embodiment described above, annular members 118 and 128 are provided on both ends of the cylindrical peripheral surfaces 117 and 127 of the casting rolls 11 and 12, respectively. It comprised so that the sealing performance of 143,144 might be improved. On the other hand, in the present embodiment, as shown in FIGS. 9 and 10, in addition to or instead of providing the annular members 118 and 128, at least the side wedges on the outside of the side wedges 143 and 144. Cover the range including the portion where the curved edge 1431, 1441 and the horizontal edge 1432, 1442 which are the lower end edges of 143, 144 and the cylindrical peripheral surfaces 117, 127 of the casting rolls 11, 12 and the roll gap 13 The auxiliary side cover plates 16 and 17 are provided in a state of being pressed by the side cover plates 143 and 144 and the end faces of the casting rolls 11 and 12.

  The auxiliary side cover plates 16 and 17 supplementarily seal the molten metal leaking from between the pair of side cover plates 143 and 144 and the cylindrical peripheral surfaces 117 and 127 of the pair of casting rolls 11 and 12. Therefore, a ceramic plate or the like having heat resistance that can withstand the melting point or liquidus temperature of the aluminum-based material can be used. Further, as described above, the size and installation position of the auxiliary side cover plates 16 and 17 are cast with at least the curved edge portions 1431 and 1414 and the horizontal edge portions 1432 and 1442 which are the lower end edges of the side cover plates 143 and 144. It suffices to cover the range including the portion where the cylindrical peripheral surfaces 117 and 127 of the rolls 11 and 12 face each other and the roll gap 13. In addition, as shown in FIG. 10, each auxiliary side cover plate 16, 17 is pressed inward to the side cover plate 143, 144 by the pressing elastic body 161, 171, but it is an auxiliary seal, in other words, For example, since the leakage of the molten metal 5 when an abnormality occurs in the side weir plates 143 and 144 is prevented, the elastic force of the pressing elastic bodies 161 and 171 may not be set large. Thereby, the wear due to the sliding between the auxiliary side wedge plates 16 and 17 and the end faces of the casting rolls 11 and 12 can be reduced as much as possible, and the replacement frequency of the auxiliary side wedge plates 16 and 17 can be reduced.

Fourth Embodiment
11 is a front sectional view (corresponding to a cross section taken along line XI-XI of FIG. 2) showing a fourth embodiment of the twin roll vertical casting apparatus according to the present invention, and FIG. 12 is a main configuration of FIG. It is a side view (XII arrow line view of FIG. 11) of the part. Hereinafter, the same reference numerals as in the specification and the drawings are attached to the same constituent members as those of the twin roll vertical casting apparatus 1 according to the first embodiment and the second embodiment described above, and all or a part of the description thereof will be described. I omit it.

  As in the first and second embodiments of the present invention, when the side weir plates 143 and 144 are placed in contact with the cylindrical peripheral surfaces 117 and 127 of the casting rolls 11 and 12 or with a slight gap, the side In particular, the sealing performance of the curved edge portions 1431 and 1414 is inferior to that in which the inner surfaces of the weir plates 143 and 144 are in contact with the end surfaces of the casting rolls 11 and 12. Therefore, in the present embodiment, as shown in FIGS. 11 and 12, a tape-like member 18 having a width corresponding to the width of the roll gap 13 and made of a material having a melting point higher than the melting point of the aluminum material. , 19 from the upper side in the vertical direction of the roll gap 13 to the lower side in the vertical direction along the inner surfaces of the pair of side weir plates 143, 144. When the aluminum sheet 2 is made of an aluminum alloy, the tape-like members 18 and 19 can be made of a pure aluminum material or the like.

  Further, as the delivery mechanism 181, 191, a mechanism for rotating a roll on which the tape-like members 18, 19 are wound can be adopted in synchronization with the casting speed. However, when the melt 53 (i.e., the aluminum sheet 2) in the solid phase is fed out from the roll gap 13 of the melt nozzle 14, the tape-like members 18 and 19 are dragged to both ends of the melt 53 in the solid phase. It is only necessary to rotatably hold the roll on which the members 18 and 19 are wound.

  Then, when the tape-like members 18 and 19 are fed out during casting of the aluminum-based material by the pair of casting rolls 11 and 12, as shown in FIG. The solid-liquid coexisting molten metal 52 and the solid-phase molten metal 53 are interrupted by the tape-like members 18 and 19, whereby the leakage of the molten metal 5 in the left-right direction is suppressed.

<< Effects of the First to Fourth Embodiments >>
In the twin roll vertical casting apparatus 1 of the present embodiment configured as described above, the inner surfaces of the side weir plates 143 and 144 do not slide with the end faces of the casting rolls 11 and 12, but the side weir plates 143 and 144 The lower curved edges 1431 and 1414 slide between the cylindrical peripheral surfaces 117 and 127 of the casting rolls 11 and 12. Or when it is installed with a slight gap, it does not even slide. Therefore, peeling of the surface layer surface of the side weir plates 143 and 144 due to sliding with the end faces of the casting rolls 11 and 12 is prevented. In addition, since a hard heat insulating material layer having heat resistance is formed on at least the surface surface of the side covering plates 143 and 144, wear of the surface side surface of the side covering plates 143 and 144 by the molten metal 5 is suppressed. Alternatively, mixing of the member peeled off from the surface layer with the produced aluminum sheet 2 is suppressed.

  Further, in the double-roll type vertical casting apparatus 1 of the present embodiment, annular members 118 and 128 are provided on both ends of the cylindrical peripheral surfaces 117 and 127 of the casting rolls 11 and 12, and the side weir plates 143 and 144 are annular members 118. , 128 so as to be in contact with the inside. As a result, the inner longitudinal surfaces of the annular members 118 and 128 also serve as sealing surfaces, so the sealing performance of the side weir plates 143 and 144 is further enhanced.

  Further, in the twin-roll vertical casting device 1 of the first embodiment, the pair of side weir plates 143 and 144 are the casting rolls 11 and 14 relative to the pair of casting rolls 11 and 12 by the tension elastic members 147 and 148. , And 12 are elastically supported in two axial directions orthogonal to the rotational shafts 111 and 121, respectively. Further, in the twin-roll vertical casting device 1 of the second embodiment, the pair of side weir plates 143 and 144 are fixed to the pair of casting rolls 11 and 12 by the pressing elastic members 145 and 146, respectively. It is elastically supported in two axial directions orthogonal to the twelve rotation shafts 111 and 121. As a result, the pair of side weir plates 143 and 144 follow the relative movement of the pair of casting rolls 11 and 12 relative to each other, and the sealability between the side weir plates 143 and 144 and the casting rolls 11 and 12 Becomes higher.

  Further, in the double-roll type vertical casting apparatus 1 of the third embodiment, at least the curved edge portions 1431 and 1414 which are the lower end edges of the side weir plates 143 and 144 and the horizontal edge outside the side weir plates 143 and 144. Auxiliary side wedge plates 16 and 17 covering the range including the roll gap 13 and the portion where the cylindrical circumferential surfaces 117 and 127 of the casting rolls 11 and 12 face each other 1432 and 1442, the side wedge plates 143 and 144 and the casting roll It is provided in the state pressed by the end face of 11,12. Thereby, the molten metal leaking from between the pair of side weir plates 143 and 144 and the cylindrical peripheral surfaces 117 and 127 of the pair of casting rolls 11 and 12 can be auxiliaryly sealed.

  In the double-roll type vertical casting apparatus 1 of the fourth embodiment, a tape-like member 18 having a width corresponding to the width of the roll gap 13 and made of a material having a melting point higher than the melting point of the aluminum-based material A feeding mechanism 181, 191 is provided for feeding the roll 19 from the upper side in the vertical direction of the roll gap 13 to the lower side in the vertical direction along the inner surfaces of the pair of side anchor plates 143, 144. Thereby, the leakage of the molten metal 5 in the left-right direction during casting of the aluminum-based material by the pair of casting rolls 11 and 12 is suppressed.

  In each of the embodiments described above, the pair of side weir plates 143 and 144 have the same configuration, but if at least one side weir plate 143 and 144 has the configuration of each embodiment described above, the side weirs As to the plate, since the above-described effects can be obtained, it may be done as such.

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 ... Hub 115 ... Metal plate 116 ... Molding surface 117 ... Cylindrical peripheral surface 118 ... Annular member 12 ... Casting roll 121 ... Rotor shaft 122 ... Elastic body 123 ... Contact surface with molten metal 124 ... Hub 125 ... Metal plate 126 ... Molding surface 127 ... Cylindrical circumferential surface 128 ... Annular member W _R ... Length of molding surface in the rotation axis direction DESCRIPTION OF SYMBOLS 13 ... Roll gap 14 ... Molten metal nozzle 141, 142 ... Main cover board 143, 144 ... Side cover board 1431, 1441 ... Curved edge part 1432, 1442 ... Horizontal edge part 145, 146 ... Press elastic body 147, 148 ... Tension elastic body 15 ... Ladle (ladle)
16, 17 ... auxiliary side plate 161, 171 ... pressing elastic body 18, 19 ... tape-like member 181, 191 ... delivery mechanism 2 ... aluminum sheet t ... thickness of aluminum sheet W ... width of aluminum sheet L ... of aluminum sheet Length 3 ... Winding machine 4 ... Mounting frame 41 ... Slide rail 5 ... Molten metal 51 ... Molten metal of liquid phase 52 ... Molten metal in coexistence with solid and liquid 53 ... Molten metal of solid phase (sheet)
6 Guide plate 7 Guide roller

Claims (6)

A twin roll vertical casting apparatus for producing an aluminum-based material into a sheet, comprising:
The cylindrical circumferential surface is oppositely disposed with a predetermined roll gap, rotates at an equal circumferential speed about mutually parallel rotational axes, and is elastically biased in a relatively approaching direction, and a part of which forms a forming surface. A pair of casting rolls, including
A pair of main wedge plates disposed opposite to each other in parallel with the rotation axis, and a pair disposed orthogonal to the rotation axis and in close proximity to or integrated with both end edges of the pair of main wedge plates And a melt nozzle disposed above the roll gap of the pair of casting rolls, the melt nozzle including the melt flow of the aluminum-based material.
The lower end edges of the pair of main anchor plates are disposed in contact with the cylindrical circumferential surface or with a slight gap.
The lower end edge portion of at least one of the side sheathing plates of the pair of side sheathing plates is disposed in contact with the circumferential surface of the cylinder or with a slight gap so that the molten metal in the molten metal nozzle does not leak .
On the outside of the one side weir plate, an auxiliary side weir plate that covers a region including at least the lower end edge of the side weir plate and the cylindrical peripheral surface of the casting roll and the range including the roll gap is A twin roll vertical casting apparatus provided in a state of being pressed to the side plate and the end face of the casting roll . The lower edge of the one side board is
A pair of curved edges which are shaped according to the shape of the cylindrical peripheral surface of the pair of casting rolls;
Connecting the lower ends of the pair of curved edges, and at least horizontally extending horizontal edges;
The curved edge is disposed in contact with the cylindrical circumferential surface or with a slight gap.
The twin roll vertical casting apparatus according to claim 1, wherein the horizontal edge extends to at least the position of the roll gap. At the end of the cylindrical peripheral surface of the casting roll, an annular member is provided which protrudes from the cylindrical peripheral surface,
The twin roll vertical casting apparatus according to claim 1, wherein the one side anchor plate is provided inside the annular member.   The one side plate is resilient in two axial directions orthogonal to the rotation axis of the casting roll with respect to the pair of casting rolls so as to follow relative movement between the pair of casting rolls. The twin roll vertical casting apparatus according to any one of claims 1 to 3, supported by A tape-like member having a width corresponding to the width of the roll gap and made of a material having a melting point higher than the melting point of the aluminum-based material is provided from the upper side of the roll gap in the vertical direction It has a mechanism to feed vertically downward along the inner surface,
The twin roll vertical casting apparatus according to any one of claims 1 to 4 , wherein the tape-like member is fed out during casting of the aluminum-based material by the pair of casting rolls. The lower end edge of each of the pair of side anchor plates is in contact with each of both ends of the cylindrical peripheral surface or is disposed with a slight gap, according to any one of claims 1 to 5. Roll type vertical casting device.

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