JP2016187825A - Metal plate production apparatus and metal plate production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal plate production apparatus and a metal plate production method, for producing a clad metal plate by continuous casting using rolls, the apparatus and the method enabling a metal plate having a surface flat in a width direction to be produced inexpensively in a process saving manner, and to provided a metal plate produced by the apparatus and the method.SOLUTION: The metal plate production apparatus comprises conveyor means 20 that has cooling capability and travels, a first pool 30 that is formed on the conveyor means and accumulates first molten metal 80, and a second pool 50 formed on the conveyor means and accumulate second molten metal 90 provided ahead of the first pool in a travel direction of the conveyor means. The second pool has a second plate 60 located ahead in a travel direction of the conveyor means, the second plate has a passage part that permits the passage of the second molten metal with a predetermined thickness or less, or means for obtaining a predetermined flow rate of the second metal by energization control or position means.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a metal plate, particularly a clad metal plate, manufactured by continuous casting using a conveyor means such as a roll, in particular, a metal plate manufacturing apparatus, a metal plate manufacturing method, and a manufactured metal plate by high speed and rapid cooling casting. Is.

  A so-called clad metal plate is known in which the same or different kinds of metals are laminated. For example, in the automobile industry and the like, it has been proposed to use an aluminum clad metal plate in order to reduce the weight of the vehicle.

  On the other hand, since magnesium is lighter than aluminum and has excellent electromagnetic shielding performance, it is expected to be applied to various applications.

  A twin roll continuous casting method has been proposed as a method for producing a clad metal plate. For example, in Patent Document 1, molten aluminum alloys having different melting points are supplied to the surfaces of a pair of twin rolls, and solidification of the molten alloys starts on the surface of each roll. The two are stacked and integrated.

  However, in the production of a clad metal plate by a twin roll type continuous casting method, there is a case where the amount of heat removed from the roll is large at the time of joining, and the temperature becomes too low to join well.

  Therefore, a single roll method as shown in Patent Document 2 has been proposed as a method of manufacturing a clad metal plate at a lower cost by making temperature control easier than these methods.

  Patent document 2 is a metal plate manufacturing apparatus which manufactures a metal plate by continuous casting using a roll, and includes a roll having cooling ability and a pool for storing a molten metal. The pool has a scraper that is positioned forward in the rotational direction of the roll and is movably provided so that the distance between the tip and the surface of the roll can be changed. When the roll is rotated, the molten metal in the pool is pulled out of the pool in a semi-solid state or a solid state on the roll surface while being cooled. Since the tip of the scraper is pressed against the drawn metal with a constant force, the molten metal or semi-solid metal formed on the surface of the metal layer cooled and solidified by the roll Can be scraped off by the tip of the scraper to obtain a metal layer having a substantially constant thickness.

  In the said patent document 2, as FIG. 5 thru | or FIG. 8 showed, the pool by which the 1st molten metal and the 2nd molten metal were poured in the rotation direction of a roll, and a scraper were provided in two steps, and the near side The first metal layer that has passed through the first scraper from the first pool is allowed to enter the second pool. Then, the molten metal of the second pool is brought into contact with the first metal layer, and the second solid layer of the second metal layer formed on the first metal layer is removed with a second scraper. By scraping, a clad metal plate having a second metal layer formed on the first metal layer is manufactured.

JP 2008-142766 A JP2011-206835A

  In Patent Document 1, in the case of the twin roll method of FIGS. 1 to 3, since the metal plate falls in the vertical direction, it is necessary to change the conveying direction to the horizontal direction in the middle, which is not preferable in terms of quality. Also, the height of the device is required. In the case of the twin roll system shown in FIGS. 4 to 8, since the partition plate and a part of the tundish are the partition plates, the position control is complicated and stable molding is difficult.

  In Patent Document 2, it is necessary to use materials having substantially the same solidification temperature range for the first metal and the second metal. Because, when the solidification temperature of the first metal is higher than the solidification temperature of the second metal, when the first metal layer penetrates into the second pool, the second metal does not solidify on the first metal, Moreover, even if it becomes a semi-solidified state, the solid phase ratio is low, and the second metal is almost scraped off by the second scraper on the rear stage side.

  Further, in Patent Document 2, even in a semi-solid state, a metal material having a high solid fraction and a low flow resistance is scraped off by a scraper due to a difference in metal material, and is deposited behind the scraper and solidifies. Therefore, stable continuous casting cannot be performed.

  In the production of the clad plate, the second metal having a low solid fraction in the semi-solid state is scraped by the second scraper, so that the second metal layer has a streak shape in the longitudinal direction which is the rotation direction of the roll. Scratches may remain and the flatness in the width direction is inferior. This is because the semi-solid second metal having a high solid phase ratio adheres in a ball shape to the tip of the second scraper, so that the surface of the metal plate is scratched, or the tip of the second scraper. It is considered that the unevenness of the heat insulating material attached to the tip portion is transferred in order to improve the heat insulating property.

  In order to obtain a clad metal plate having a certain thickness, it is necessary to control the production conditions such as the temperature of the molten metal, the temperature of the roll, the rotational speed of the roll, and the adjustment of the pressing strength of the second scraper. It was difficult to adjust these various conditions.

  Conventionally, a clad metal plate made of a magnesium alloy is prepared by previously rolling a first metal plate and a second metal plate by hot rolling, and then joining these two metal plates by hot rolling. The hot rolling process requires expensive manufacturing equipment, and the manufacturing cost of the metal plate is high. Furthermore, since the magnesium alloy is easily oxidized, an oxide film is formed on the surfaces of the first metal plate and the second metal plate. The oxide film remains on the joint surfaces of the two metal plates, so that the bondability is lowered, and it is difficult to separate the two metal plates and to integrate them. Furthermore, in the case of a magnesium alloy (for example, AZ91) containing 9% or more of aluminum, it is difficult to hot-roll because it is hard. Similarly, an aluminum alloy (for example, A5182) containing 4% or more of magnesium is difficult to hot-roll because it is hard, and is difficult to be clad because of surface oxidation.

  Accordingly, a magnesium alloy having a particularly high magnesium or aluminum content is used as the first metal plate and the second metal plate, and the provision of a clad metal plate with good bondability, a metal plate manufacturing apparatus and a manufacturing method for manufacturing the same. Development is strongly desired.

  It is an object of the present invention to produce a metal plate, particularly a magnesium alloy, and further a clad metal plate of a magnesium alloy having a high aluminum content by continuous casting using a roll from a molten metal without requiring a process such as rolling. Metal plate manufacturing apparatus, metal plate manufacturing method, metal plate manufacturing method, metal plate manufacturing method, metal plate manufacturing method, metal plate manufacturing method, in particular, with the aim of eliminating the above-mentioned problems in a manufacturing method of clad metal And it is providing the metal plate manufactured by this. Furthermore, from the viewpoint of productivity, a manufacturing apparatus and a manufacturing method having high productivity in high-speed rapid casting with a casting speed of 10 m / min to 120 m / min and a cooling speed of 100 ° C./sec to 2000 ° C./sec are provided. For the purpose. Furthermore, an object of the present invention is to provide a metal plate manufacturing apparatus, a metal plate manufacturing method, and a metal plate manufactured thereby, the surface of which also has flatness in the width direction.

The metal plate manufacturing apparatus according to the present invention is:
Conveyor means having cooling ability and traveling;
A first pool formed on the conveyor means for storing a first molten metal;
A second pool for storing a second molten metal formed on the conveyor means and provided in front of the conveyor means in the running direction of the first pool;
With
The first pool is surrounded by the surface of the conveyor means, a first plate located in front of the conveyor means in the running direction, a rear member located in the running direction of the first plate, and both side members. And
The conveyor means travels with the first metal layer while cooling the first metal melt in the first pool to form a semi-solid or solidified first metal layer on the surface of the conveyor means. And
The first plate has a front end portion and is movably provided so that the distance between the first plate front end portion and the surface of the conveyor means can be changed, and moves as the conveyor means travels. The front end of the first plate is urged so that it always abuts with a constant force so that the solidified state layer and / or the semisolid state layer of the first metal passes but the molten metal does not pass. ,
The second pool includes a solidified layer and / or semi-solidified layer surface of the first metal formed on the conveyor means in the first pool, and a second plate positioned in front of the conveyor means in the running direction. And the first plate located behind the conveyor means in the running direction, and both side members, and solidifying the first metal formed on the conveyor means in the second pool The second metal in the second pool is laminated on the surface of the state layer and / or the semi-solid state layer to form a second metal layer in a solid state, a semi-solid state or a molten state, by running the conveyor means. It is supposed to move,
The second plate is configured to allow passage of the second metal in a molten state having a thickness equal to or less than a certain thickness. In the case of a plate having a leg portion and a passage portion at the tip of the second plate, The flow rate of the second metal is adjusted according to the height of the passage portion, and in the case of a plate having a shape that does not have a leg portion at the tip of the second plate, the biasing force that maintains the tip of the second plate at a certain height causes Adjusting the flow rate of two metals, or adjusting the flow rate of the second metal according to the height position of the tip of the second plate;
Means for preventing the molten metal after passing through the second plate from flowing to the side surface of the traveling means.

  A leveling means that faces the conveyor means and touches the unsolidified surface of the second metal may be provided in front of the second plate in the running direction of the conveyor means.

The conveyor means is a first roll having a circular outer peripheral section,
The leveling means may be a second roll having a rotation axis parallel to the rotation axis of the first roll, rotating in the opposite direction to the first roll, and having cooling ability.

  The leveling means may be a third plate that is biased to contact the surface of the second metal.

  The first metal and the second metal may be a magnesium alloy, or the first metal and the second metal may be an aluminum alloy.

Moreover, the manufacturing method of the metal plate which concerns on this invention is
A method of manufacturing a metal plate using the metal plate manufacturing apparatus,
Pouring the first metal melt and the second metal melt into the first pool and the second pool, respectively;
Running the conveyor means,
The first molten metal in the first pool is cooled by the conveyor means to form a first metal layer having a solidified layer and / or a semi-solidified layer on the surface of the conveyor means, and the first metal Passing a layer through the tip of the first plate into the second pool;
In the second pool, the gap holding means for the second plate while forming the second metal layer in a solidified state, a semi-solid state or a molten state at least below a certain thickness difference on the first metal layer. Is allowed to pass, so that at least a molten second metal is formed on the first metal layer.

The clad metal plate of the present invention is
A clad metal plate in which a magnesium or magnesium alloy metal layer is formed on a magnesium or magnesium alloy metal layer, both the metal layers having a cast structure.

  The metal layer has a fine structure formed by rapid cooling.

According to the metal plate manufacturing apparatus and the metal plate manufacturing method of the present invention, it is possible to manufacture a multi-layer metal plate with a low cost, simple apparatus without requiring a process such as rolling.
According to the metal plate manufacturing apparatus and the metal plate manufacturing method of the present invention, the second metal layer containing at least a molten second metal is laminated on the first metal layer that has passed through the first plate. Pass through the second plate. When the second metal in the molten state passes through the passage amount holding means of the second plate, scratches such as scratches do not occur. Therefore, the manufactured metal plate can flatten the surface of the second metal layer in the width direction.

  In addition, after passing through the second plate, the surface of the molten second metal layer is smoothed by a smoothing means, so that the obtained metal plate has a constant thickness and a flat surface in the width direction. It can be smooth. Further, by leveling the surface before the second metal is completely solidified, the pressing pressure of the leveling means can be reduced.

The metal plate manufacturing apparatus and the metal plate manufacturing method of the present invention are particularly suitable for manufacturing a clad metal plate in which the first metal and the second metal are magnesium alloys. Magnesium alloy is an easily oxidizable metal, but after the first metal layer is formed in the first pool, the first metal layer penetrates into the second pool without touching the oxidizing atmosphere, and the second metal layer Therefore, oxygen does not enter between the first metal layer and the second metal layer, so that a good bonding state between the first metal layer and the second metal layer can be maintained.
The first metal and the second metal can be suitably used even when aluminum or an aluminum alloy is used.

  If the clad metal plate manufactured by the manufacturing apparatus or manufacturing method of the present invention is cooled at high speed, it has a refined cast structure and can have high ductility.

  Further, the clad metal plate of magnesium or magnesium alloy of the present invention is a joined clad material that has a cast structure and is manufactured without rolling. According to the high speed rapid casting method, since it has a refined structure, it can have high ductility. According to the clad metal plate of the present invention, compared with a clad metal plate manufactured by hot rolling, the interposition of an oxide film and the mixing of oxygen are prevented between metal layers, so that the metal layers have high bondability. it can.

FIG. 1 is a schematic cross-sectional view showing a metal plate manufacturing apparatus according to a first embodiment of the present invention. FIG. 2 is a partial fragmentary view from the direction of arrow II in FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view showing different embodiments of the tip portion of the first plate. FIG. 6 is a perspective view of the tip of the second plate. FIG. 7 is a schematic cross-sectional view showing a state in which a metal plate is manufactured by the metal plate manufacturing apparatus of the first embodiment. FIG. 8 is an enlarged cross-sectional view of the circled portion A of FIG. FIG. 9 is a cross-sectional view illustrating the metal layer cut along line BB in FIG. FIG. 10 is a cross-sectional view for explaining the metal plate cut along the line CC in FIG. 7, and is a view after passing through the leveling means. FIG. 11 is a schematic cross-sectional view showing a metal plate manufacturing apparatus according to the third embodiment of the present invention. The metal plate manufacturing apparatus which fixed the 2nd plate is shown. FIG. 12 is a perspective view showing a different embodiment of the tip of the second plate. FIG. 13 is a perspective view showing an embodiment in which side members are provided in a bowl shape on the conveyor means. FIG. 14 is an enlarged view of the circled portion D in FIG. 7, in which a plate is provided in front of the leveling roll. FIG. 15 is a schematic cross-sectional view showing a metal plate manufacturing apparatus according to the second embodiment of the present invention, and shows the metal plate manufacturing apparatus without leveling means. FIG. 16 is a schematic cross-sectional view showing a metal plate manufacturing apparatus according to a third embodiment of the present invention, and shows a metal plate manufacturing apparatus employing a third plate as leveling means. FIG. 17 is a cross-sectional photograph of the clad metal plate according to the first example. FIG. 18 is a photomicrograph of the vicinity of the surface of the second metal layer taken by etching the cross section of the clad metal plate according to the first example. FIG. 19 is a cross-sectional photograph of the clad metal plate according to the second embodiment. FIG. 20 is a photomicrograph of the vicinity of the surface of the second metal layer taken by etching the cross section of the clad metal plate according to the second example. FIG. 21 is a photograph of the initial end of the clad metal plate according to the second example. FIG. 22 is a photograph showing an end surface of the clad metal plate according to the second embodiment which is bent and broken. FIG. 23 is a cross-sectional photograph of the clad metal plate according to the third example. FIG. 24 is a photomicrograph of the vicinity of the surface of the second metal layer taken by etching the cross section of the clad metal plate according to the third example. FIG. 25 is a photograph showing the flatness of the metal plate in the width direction.

  Hereinafter, the metal plate manufacturing apparatus 10 which concerns on one Embodiment of this invention is demonstrated, referring drawings.

<First Embodiment>
FIG. 1 is a schematic cross-sectional view showing an embodiment of a metal plate manufacturing apparatus 10 according to an embodiment of the present invention. The metal plate manufacturing apparatus 10 is an apparatus for manufacturing a single-layer metal plate from two types of molten metal of the same type or different types, and employs a single roll method.

  As shown in FIG. 1, the metal plate manufacturing apparatus 10 includes a conveyor means such as a conveyor roll 20, and a first pool 30 and a second pool 50 that each store molten metal.

  A conveyor means is a single roll shown as the conveyor roll 20 in this embodiment. The conveyor means may have a roll shape, a belt shape, or the like as long as it has a molten metal delivery function and a cooling function. By adopting a roll shape as the conveyor means, the manufacturing apparatus can be simply configured.

  The delivery function of the molten metal of the conveyor roll 20 is realizable by comprising the conveyor roll 20 so that rotation drive is possible. For example, the delivery function may be arranged such that the conveyor roll 20 can rotate (run) in the direction of the arrow R1 in FIG. 1 so that molten metal can be delivered, and the shaft of the conveyor roll 20 is rotated by a motor or the like.

  Further, the conveyor roll 20 has a cooling function for cooling the molten metal that has come into contact with the surface 22 thereof. The cooling function can be exemplified by a “water-cooled type” in which the cooling function is exhibited by circulating cooling water inside the conveyor roll 20, but other mechanisms may be adopted. Further, if a cooling mechanism is provided outside the conveyor roll 20, the cooling mechanism may not be provided inside the conveyor roll 20.

  The conveyor roll 20 having the delivery function and the cooling function described above rotates while cooling the molten metal 80 and 90 (see FIG. 7) in the first pool 30 and the second pool 50 that are in contact with the surface 22 thereof.

  As shown in FIG. 1, the first pool 30 is positioned in front of the surface 22 of the conveyor roll 20 and the rotation (running) direction (arrow R1 direction) of the conveyor roll 20 so that the first molten metal can be stored. The first plate 40, the rear member 32 located behind the conveyor roll 20 in the rotation direction, and both side members 34 are surrounded.

  As shown in FIGS. 1 and 2, the rear member 32 is a member that prevents leakage of the first molten metal from the first pool 30 to the rear side of the conveyor roll 20. The rear member 32 is made of a plate in the present embodiment because it is inexpensive to manufacture and easy to install. However, other members may be used as long as the rear wall of the first pool 30 can be formed. The leading edge of the rear member 32 is close to the surface 22 of the conveyor roll 20 to a distance that can prevent the first molten metal stored in the first pool 30 from leaking backward. The leading edge of the rear member 32 may abut against the surface 22 of the conveyor roll 20 as long as the conveyor roll 20 is allowed to rotate. It is preferable not to contact the surface 22 of the conveyor roll 20.

  As shown in FIGS. 1 to 4, both side members 34, 34 are members that prevent leakage of the first molten metal and the second molten metal from the first pool 30 and the second pool 50 to the side of the conveyor roll 20. It is. On the inner surface of the side member 34, the first metal melt and the second metal melt stored in the first pool 30 and the second pool 50 and the second metal melt that has passed through the second plate 60 leak to both sides of the conveyor roll 20. It is close to the side surface of the conveyor roll 20 up to a distance that can prevent this. In addition, although both the side members 34 are comprised with the plate in this embodiment, they comprise the both side walls of the 1st pool 30 and the 2nd pool 50, and also the 2nd metal molten metal which passed the 2nd plate 60 As long as it can be prevented from leaking to both sides of the conveyor roll 20, other members may be used.

  As shown in FIGS. 1 and 3, the first plate 40 forms the front wall of the first pool 30 and the plate so as to form the rear wall of the second pool 50 described below. Is provided. 1 and 3, the first plate 40 has a shape in which the tip is bent, but the cross section may have a linear shape or an arc shape. As shown in FIG. 1, the front end portion 42 of the first plate 40 can be movably provided so that the distance H1 between the front plate 22 and the surface 22 of the conveyor roll 20 can be changed. Specifically, the first plate 40 is supported at the base end portion so as to be rotatable about the horizontal axis 43 as a rotation axis (in the direction of the arrow Y), whereby the distance H1 is variable. Further, the first plate 40 is always biased and controlled so as to rotate in a direction (arrow Y1 direction) in which the distance H1 decreases. A weight 44 having a predetermined weight is connected to the base end portion of the first plate 40 via a string 44a. The first plate 40 is always constant so as to be rotated by the weight 44 in the arrow Y1 direction. It is pulled by the power of. Thereby, the front-end | tip part 42 of the 1st plate 40 is always urged | biased with the fixed force toward the surface 22 of the conveyor roll 20. FIG. This pressing force strongly contacts the surface of the first metal layer passing between the front end portion 42 of the first plate 40 and the surface 22 of the conveyor roll 20, and is not solidified or adhered to the surface of the first metal layer. The semi-solid first metal is scraped out to prevent the unsolidified or semi-solid first metal from flowing out into the second pool 50. The reason why the unsolidified or semi-solidified first metal is prevented from flowing out into the second pool 50 is to prevent the component change and contamination of the second molten metal in the second pool 50. .

  As shown in FIG. 5, a heat insulating material 46 can be attached to the distal end portion 42 of the first plate 40. Examples of the heat insulating material 46 include a nonwoven fabric such as alumina fiber (for example, trade name “ISOWOOL” (registered trademark)). More specifically, FIGS. 5A and 5B are examples in which a heat insulating material 46 is attached so as to wrap the tip portion 42, and FIGS. 5C and 5D are tips of the first plate 40. In this example, the heat insulating material 46 is pasted so that the portion 42 is exposed. If the heat insulating material 46 is pasted so as to wrap the tip portion 42, the effect of preventing the first metal from flowing out into the second pool 50 is enhanced, and if the heat insulating material 46 is pasted so as to expose the tip portion 42, The unevenness of the heat insulating material is prevented from being transferred to the surface of one metal layer, and the flatness in the width direction is improved.

  The material of the first plate 40 is not limited, but at least the tip portion 42 includes metal, ceramics, silicon nitride, boron nitride, SiC, alumina, zirconia, and the like.

  As shown in FIG. 1, the second pool 50 is positioned in front of the surface 22 of the conveyor roll 20 and the rotation (running) direction (arrow R1 direction) of the conveyor roll 20 so that the second molten metal can be stored. The second plate 60, the first plate 40 located behind the conveyor roll 20 in the rotation direction, and both side members 34, 34 are surrounded.

  The 2nd plate 60 which comprises the front wall of the 2nd pool 50 is processed and provided as shown in FIG.1, FIG4 and FIG.6. In FIG. 1, the second plate 60 has a shape in which the cross section is bent, but the cross section may have a linear shape or an arc shape.

  The material of the second plate 60 is not limited, but at least the tip portion 42 includes metal, ceramics, silicon nitride, boron nitride, SiC, alumina, zirconia, and the like.

  As shown in FIG. 1, the front end portion 62 of the second plate 60 is movably provided so that the distance H <b> 2 with the surface 22 of the conveyor roll 20 can be changed. Specifically, the second plate 60 is supported at the base end portion so as to be rotatable about the horizontal axis 63 as a rotation axis (in the direction of arrow Y), thereby making the distance H2 variable. Further, the second plate 60 is always biased and controlled so as to rotate in a direction (arrow Y1 direction) in which the distance H2 decreases. As a distance holding means for urging control, a weight 64 having a predetermined weight is connected to the base end portion of the second plate 60 via a string 64a, and the second plate 60 is connected to the arrow Y1 by the weight 64. It is always pulled with a constant force so as to rotate in the direction. Thereby, the front-end | tip part 62 of the 2nd plate 60 is always urged | biased by the fixed force toward the surface 22 of the conveyor roll 20. FIG.

  A contact portion is provided at the distal end portion 62 of the second plate 60, and a contact surface 65 that contacts the surface of the second molten metal 90 is provided at the contact portion.

  The force urged by the second plate 60 acts as a pressing force against the second molten metal 90 from the contact surface 65. As will be described later, the pressing force is set so that the second molten metal 90 passes through the contact surface 65 of the second plate 60 in a molten state having a predetermined thickness. That is, when the pressing force of the first plate 40 and the second plate 60 is compared, the pressing force of the second plate 60 is set to be smaller than the pressing force of the first plate 40.

  By setting the pressing force of the second plate 60 as described above, the second metal melt 90 is pressed from the contact surface 65 with a constant pressing force, and receives a constant reaction force that the contact surface 65 does not sink, The height of the contact surface 65 can be kept floating.

  As shown in FIG. 6, it is desirable to attach a heat insulating material 66 to the second plate 60. Thereby, while being able to improve the heat retention effect with respect to the 2nd metal molten metal 90, it can suppress that a molten metal adheres to the 2nd plate 60 and solidifies. For example, the heat insulating material 66 can be exemplified by a nonwoven fabric such as alumina fiber (for example, trade name “ISOWOOL” (registered trademark)). In particular, by arranging the heat insulating material 66 on the second pool 50 side of the second plate 60, it is possible to further prevent the reaction between the second plate 60 and the second molten metal.

  Further, as shown in FIG. 1, the conveyor roll 20 is provided with a second molten metal 90 that faces the conveyor roll 20 in front of the second plate 60 in the rotational direction of the conveyor roll 20 and passes through the second plate 60. A leveling means having a leveling function is arranged. In the figure, the leveling means is a leveling roll 70, and the leveled second metal melt 90 is leveled in an uncured state by the leveling means, whereby the crushed second metal melt 90 is converted into the first metal layer. 83, or a function of integrating with the second metal layer 93 in a solidified or semi-solidified state.

  Moreover, the surface of the clad metal plate 100 manufactured by the leveling roll 70 that is leveling means is flattened in the width direction, and the thickness can be adjusted. Desirably, the leveling roll 70 has a cooling function such as water cooling, so that the second molten metal 90 can be rapidly cooled and solidified. In this way, the metal plate surface 100 can be flattened by applying the leveling roll 70 while the second metal is in a molten or semi-solid soft state. In the method of Patent Document 2, since the molten or semi-solid second metal is scraped off by a scraper, there is no unsolidified layer and it cannot be leveled.

  A method of manufacturing a metal plate using the metal plate manufacturing apparatus 10 having the above configuration will be described with reference to FIGS.

  First, when the metal plate manufacturing apparatus 10 is activated, the conveyor roll 20 starts rotating and the cooling function is activated. Next, the first molten metal 80 and the second molten metal 90 are poured into the first pool 30 and the second pool 50, respectively.

  As the first molten metal 80 and the second molten metal 90, a molten metal having the same or different alloy composition can be adopted. A desirable combination of the first molten metal 80 and the second molten metal 90 will be described later.

  First, paying attention to the first pool 30, the conveyor roll 20 rotates at a predetermined speed, and the first molten metal 80 in the first pool 30 that is in contact with the surface 22 is cooled and gradually thickened while solidifying. Thus, the solidified first metal layer 83 is formed. The circumferential distance L1 (FIG. 7) from the lower end edge of the rear member 32 to the front end portion 42 of the scraper plate 40 is such that the first metal melt 80 is solidified and the front end portion 42 of the first plate 40 and the surface of the conveyor roll 20 The first metal layer 83 corresponding to the height of the distance H1 (see FIG. 1) between the first metal layer 83 and the second metal layer 22 is set. The first metal layer 83 passes between the front end portion 42 of the first plate 40 and the surface 22 of the conveyor roll 20 as the conveyor roll 20 travels. Since the first plate 40 is pressed against the first metal layer 83 by the urging force of the weight 44, an unsolidified or semi-solid state formed on the first metal layer 83 when passing through the first plate 40. The first molten metal 80 is scraped off by coming into contact with the tip 42 of the first plate 40.

  Then, the solidified first metal layer 83 passes through the first plate 40 and enters the second pool 50. Since the second metal melt 90 is poured into the second pool 50, the first metal layer 83 that has entered the second pool 50 contacts the second metal melt 90. At this time, since the surface of the first metal layer 83 enters the second pool 50 without being exposed to the oxidizing atmosphere, the surface of the first metal layer 83 is not oxidized.

  Since the first metal layer 83 continues to be cooled from the surface 22 of the conveyor roll 20, the second molten metal 90 that comes into contact with the cooled surface of the first metal layer 83 is gradually semi-solidified or solidified. It adheres to the surface of one metal layer 83. The attached second metal in the solidified state or semi-solidified state is referred to as a second metal solidified layer 91. The second metal solidified layer 91 and the first metal layer 83 are integrated with each other so as not to be peeled off. The second metal solidified layer 91 is formed so that the thickness of the second metal solidified layer 91 does not reach the leading end 62 when passing through the leading end 62 of the second plate 60. A distance H2 (see FIGS. 1 and 8) and a pressing force between 62 and the surface 22 of the conveyor roll 20 are set.

  In the present embodiment, the second plate 60 is always pulled with a constant force so as to rotate in the direction of the arrow Y1 in FIG. Even if it is formed thick, it can pass through the second plate 60.

  On the other hand, on the 2nd metal solidified layer 91, as shown in FIG.7 and FIG.8, the 2nd metal is mounted in the molten state in the 2nd pool 50. FIG. Then, the molten second metal flows out in a molten state from between the surface of the second metal solidified layer 91 and the tip 62 of the second plate 60. The second metal melt that passes through the second plate 60 together with the second metal solidified layer 91 is referred to as a second metal melt layer 92.

  FIG. 9 is a cross-sectional view of the metal that has passed through the tip 62 of the second plate 60. As shown in the drawing, it can be seen that the metal has a second metal solidified layer 91 formed on the first metal layer 83 and a molten second metal melt layer 92 formed thereon.

  In this state, while receiving further cooling from the conveyor roll 20, the second molten metal layer 92 is cooled while being leveled in an unsolidified state by the leveling roll 70 shown in FIG. The molten metal layer 92 is solidified and integrated with the second metal solidified layer 91 to form a second metal layer 93 as shown in FIG. Thereby, the clad metal plate 100 in which the first metal layer 83 and the second metal layer 93 are integrated is obtained.

  The obtained clad metal plate 100 is integrated between the first metal layer 83 and the second metal layer 93 without being oxidized, as will be described in Examples described later. And the second metal layer 93 both have a cast structure. When the leveling roll 70 having a cooling function is applied, it is observed that the surface of the second metal layer 93 is flat and smooth in the width direction by the leveling roll 70.

  If high-speed rapid casting is performed at a casting speed of 10 m / min to 120 m / min and a cooling speed of 100 ° C./sec to 2000 ° C./sec, the first metal layer 83 and the second metal layer 93 have a refined cast structure. The clad metal plate 100 has high ductility.

  In the manufactured clad metal plate 100, the second metal layer 93 can be observed to have different structures solidified from the first metal layer 83 side and the surface side of the second metal layer 93. And the second metal layer 93 can be discriminated.

  Hereinafter, different embodiment of the metal plate manufacturing apparatus 10 of this invention is described. These embodiments can be combined with the embodiments described above. Of course, the following embodiments can be combined. In addition, the same code | symbol is attached | subjected about the same member as the said embodiment, and description is abbreviate | omitted suitably.

  FIG. 11 shows an embodiment in which the second plate 60 is position-controlled, for example, fixed. The 2nd plate 60 is being fixed to the metal plate manufacturing apparatus 10 so that the front-end | tip part 62 may hold | maintain fixed height (space | interval H2) with respect to the surface of the conveyor roll 20. FIG. Thereby, there exists an advantage which can make the height of the metal which passes the 2nd plate 60 constant.

  FIG. 12 shows a different embodiment of the second plate 60. The second plate 60 in FIG. 12 has a passage portion 67 that is recessed by a height H3 in the direction away from the surface of the conveyor roll 20 between the leg portions 68 on both sides of the tip portion 62. By forming the passage portion 67, the second plate 60 swings in accordance with the shape of the solidified first metal layer 83 or the second metal solidified layer 91 at the tips of the legs 68 and 68. As a result, only the second molten metal passes through the passage portion 67, and the second molten metal layer 92 having a certain thickness can flow out.

  By appropriately setting the height H3 of the passage portion 67, the amount of molten metal to be passed is determined. For this reason, it is possible to prevent the second molten metal 90 from flowing out excessively, and to easily set and control the manufacturing conditions.

  When the second plate 60 of FIG. 12 is used, it is conceivable that the first metal slightly scraped off by the legs 68 and 68 is mixed into the second pool 50. When the components of the first metal layer and the second metal layer are different and it is desired to prevent the first metal component from being mixed into the second pool, the tip of the second plate is used with respect to the roll surface without using the legs. A method of controlling the height of H2 that keeps the distance of the roll surface constant may be used.

  FIG. 13 shows a different embodiment of both side members 34, 34 in which both side members 34 are integrally attached to both ends of the conveyor roll 20 in a bowl shape.

  Further, as shown in an enlarged view 14 of the circled portion A in FIG. 7, a plate 98 is provided in front of the leveling roll 70 which is leveling means, and the leveling roll 70 of the unsolidified portion of the second metal layer You may make it adjust the flow volume which contacts further and adjust the thickness of a 2nd metal layer. By adjusting the flow rate of the unsolidified second metal that comes into contact with the leveling roll 70 before the leveling roll 70, the thickness of the second metal layer can be adjusted more accurately. Referring to FIG. 14, the second molten metal 90 in contact with the surface of the leveling roll 70 receives cooling from the leveling roll 70 and forms a thin solidified layer on the leveling roll 70.

  FIG. 15 is an embodiment of the metal plate manufacturing apparatus 10 without leveling means. By using no leveling means, irregularities are generated on the surface of the clad metal plate 100 to be manufactured. However, since the molten second metal melt layer 92 has fluidity, the fine irregularities disappear. . The manufactured clad metal plate 100 may be subjected to a rolling process that is a separate process, hot or cold, as necessary.

  FIG. 16 shows different embodiments of the leveling means. The illustrated leveling means is a plate-shaped leveling plate 72, and its tip is positioned at a height at which it can abut against the second molten metal layer 92 that has passed through the second plate 60. If necessary, the leveling plate 72 can be provided with a cooling function.

  Then, the molten metal applicable to this invention is demonstrated. Examples of the molten metal applicable to the present invention and the combination thereof include the same or different metals as described above. Examples of metals that can be used include magnesium-based metals, aluminum-based metals, and copper-based metals. It is preferable that the first metal and the second metal are made of a material having substantially the same solidification temperature range, or a material having a solidification temperature of the second metal equal to or lower than the solidification temperature of the first metal.

  More specifically, examples of the magnesium-based metal include magnesium, a magnesium alloy, an AZ-based alloy, an AM-based alloy, a ZK-based alloy, and a composite material having a magnesium group as a matrix.

Also, aluminum, aluminum alloy, Al-Si alloy, Al alloy with Si content of 7% or more, Al-Cu alloy, Al-Mg alloy, JIS 1000 to 8000 Al alloy, etc. A practical example is an aluminum alloy such as an Al alloy, and a composite material having an aluminum group as a matrix, such as Al-SiC _p (including SiC ceramic powder in an Al alloy).

  Examples of copper-based metals include copper alloys such as copper and brass, and zinc, zinc alloy, lead, lead alloy, iron alloy, cast iron, and the like are preferable.

  Especially this invention is suitable for manufacture of the clad metal plate which uses magnesium and a magnesium alloy as a molten metal. The reason for this is that magnesium and magnesium alloys are highly oxidizable metals, and when two magnesium or magnesium alloy metal plates are joined by hot rolling, an oxide film is interposed between the metal plates or oxygen. This is because embrittlement occurs at the joint portion and the joint state between the first metal layer and the second metal layer deteriorates. Moreover, this kind of clad metal plate becomes a processed structure.

  If the clad metal plate of magnesium or magnesium alloy of the present invention is rapidly cooled (rapidly cooled and solidified), the first metal layer 83 and the second metal layer 93 become a refined structure and become a clad metal plate having high ductility. Needless to say, since oxygen is not mixed into the bonding surface between the metal layers, the bonding strength between the metal layers can be increased as much as possible.

  The clad metal plates of the first to fourth examples were manufactured using the metal plate manufacturing apparatus 10 shown in FIG. The details of the metal plate manufacturing apparatus 10 are as follows.

[Conveyor roll 20 (cooling roll)]
・ Roll material ... Copper alloy ・ Roll diameter ... 1000mm
・ Roll width ... 100mm
・ Roll rotation speed (peripheral speed): 30 m / min ・ Roll cooling system: Water cooling with circulating water

[First plate 40]
· Form ... with the bent form as shown in Fig. 1 · Material ... Steel plate · Width of tip 42 ... 100mm
The distance H1 before pouring between the surface 22 of the conveyor roll 20 and the tip of the first plate 40 is 1 mm.

Cover both sides of the first pool 30 and the second pool 50 with Isorule (registered trademark) (2 mm thickness) which is a heat insulating material 66, and further cover with BN (boron nitride) sprayed. Pressing load (biasing force): 10kg
(At the tip of the first plate 40, the weight 44 was adjusted to 10 kg by actually measuring with a spring balance.

[Second plate 60]
· Form ... with a bent form as shown in Fig. 1 · Material ... Steel plate · Width of tip 62 ... 100mm
The distance H2 before pouring between the surface 22 of the conveyor roll 20 and the tip of the second plate 60 is 4 mm.
-The second pool 50 side is covered with Isorule (registered trademark) (2 mm thickness), which is a heat insulating material 66, and further covered with BN (boron nitride) spray.-Pressing load (biasing force) of the second plate 60: 5kg
(At the front end of the second plate 60, the weight 64 was adjusted to be 5 kg by actually measuring with a spring balance.

[Side member 34]
・ Shape… Rectangular plate material ・ Usage form: It is attached with a slight gap so that the molten metal does not leak and the first plate and the second plate are movable.
・ Material: Steel plate. The first pool 30 and the second pool 50 side are covered with Isorule (registered trademark) (2 mm thickness) which is a heat insulating material and further covered with BN (boron nitride) sprayed.

[Leveling roll 70]
・ Material of leveling roll ... Copper ・ Diameter of leveling roll ... 300mm
・ Leveling roll width: 100mm
-Pressing with constant pressing force of the leveling roll per unit width (F1 in FIG. 1) ... 10 kN (0.1 kN / mm)
・ Rotation speed (peripheral speed) of leveling roll: 30 m / min ・ Cooling system of roll: Water cooling system ・ Distance before start of pouring between surface 22 of conveyor roll 20 and leveling roll: 2 mm

  In the first to fourth embodiments of the metal plate manufacturing apparatus 10 having the above-described configuration, a clad metal plate was manufactured using a combination of the following first metal and second metal.

[First embodiment]
First molten metal 80: material ... AM60, solidus temperature ... 540 ° C, liquidus temperature ... 615 ° C
Second molten metal 90: material ... AZ91, solidus temperature ... 470 ° C., liquidus temperature ... 595 ° C.

[Second Embodiment]
First molten metal 80: material ... AM60, solidus temperature ... 540 ° C, liquidus temperature ... 615 ° C
Second metal melt 90: material ... AZ121, solidus temperature ... 433 ° C., liquidus temperature ... 585 ° C.

[Third embodiment]
First molten metal 80: Material ... AC7A (Al-Mg alloy), solidus temperature ... 570 ° C, liquidus temperature ... 635 ° C
Second metal melt 90: material ... AC4C (Al-Si-Mg alloy), solidus temperature ... 555 ° C, liquidus temperature ... 610 ° C

[Fourth embodiment]
First molten metal 80: material ... 3003 (Al-Mg alloy), solidus temperature ... 643 ° C, liquidus temperature ... 655 ° C
Second metal melt 90: material ... AC7A (Al-Mg alloy), solidus temperature ... 570 ° C, liquidus temperature ... 635 ° C

  Each of the clad metal plates 100 manufactured as described above was etched and a cross-sectional photograph was taken. FIG. 17 shows the first embodiment, FIG. 19 shows the second embodiment, and FIG. 23 shows the third embodiment (the fourth embodiment is not shown).

  Referring to each figure, it can be seen that the first metal layer 83 and the second metal layer 93 are both satisfactorily bonded, and the surface on the second metal layer 93 side has a smooth surface with almost no irregularities.

  Further, in any of the clad metal plates 100, the first metal layer 83 and the second metal layer 93 have a refined structure formed by high-speed rapid casting. Also in the 2nd metal layer, it turns out that the refinement | miniaturization structure | tissue is formed from the microscope picture (FIG.18, FIG.20, FIG.24) of the 2nd metal layer of the 1st-3rd Example.

  Since the first metal layer 83 and the second metal layer 93 have a refined cast structure, the clad metal plate has high ductility.

  Table 1 shows the results of rolling each clad metal plate 100 with a total reduction of 50%. As with a single metal plate, it was cracked and could not be rolled, “X”, and rolled without cracking or peeling, “◯”.

  Referring to Table 1, in all of the clad metal plates manufactured in the first to fourth examples, hot rolling was possible without causing cracking or peeling. In particular, the metal plates of the third and fourth examples could be rolled without cracking or peeling even when cold rolled. Moreover, it can be seen from the results in Table 1 that each clad metal plate 100 has high ductility.

  In order to observe the surface vicinity photograph of the 2nd metal layer 93 of 1st Example further in detail, the microscope photograph of the surface vicinity of the 2nd metal layer 93 was image | photographed. The photograph taken is shown in FIG. Referring to the figure, the second metal layer 93 has a fine structure of rapid solidification, the surface crystal grains are grown without interruption, and the depth of the crystal grains is ½ or more of the diameter. It can be seen that the surface is smooth with no unevenness.

  Also in the second example, referring to the micrograph FIG. 20 near the surface of the second metal layer 93, the surface of the second metal layer 93 is deepened by a leveling roll 70 to a depth of 1/2 or more of the diameter of the crystal grains. It can be seen that the surface is smooth with no unevenness.

  With respect to the second example, the first end immediately after the production of the clad metal plate was photographed as shown in FIG. Referring to FIG. 21, a single plate of AM60 magnesium alloy as the first metal layer 83 is manufactured. A second metal layer 93 is formed on the surface of the first metal layer 83. In this state, the second metal layer 93 is laminated in a state where the first metal layer 83 is in a solid plate state. In the present invention, a single plate made of the first metal layer 83 can be manufactured by using only the first pool 30.

  In order to examine the bonding state between the first metal layer 83 and the second metal layer 93, the clad metal plate 100 obtained in the second example was repeatedly bent until it broke. As a result, as shown in FIG. 22, in the fracture surface, the first metal layer 83 and the second metal layer 93 can maintain a good bonded state (indicated by an arrow in the figure) without peeling. Recognize. Thus, it can be seen that the clad metal plate 100 having excellent secondary workability can be provided by increasing the bonding strength between the first metal layer 83 and the second metal layer 93. The same applies to the first example, the third example, and the fourth example.

  In the third example, the structure of the second metal layer AC4C was measured by the DAS (Dendrite Arm Spacing) method. The photograph which expanded the cross section of the 2nd metal part (AC4C) of the clad metal plate 100 of 3rd Example becomes FIG. It can be seen from the DAS in FIG. 24 that the tissue has been quenched at a cooling rate of about 200 ° C./second or higher.

Even in the first embodiment, the second embodiment, and the fourth embodiment, the cooling rate equivalent to that of the third embodiment is obtained from the solidification latent heat, thermal conductivity, and plate thickness of the first metal and the second metal. it is obvious. This can also be seen from the refined structures in the micrographs (FIGS. 18 and 20) of the second metal layer of the first and second examples.
In addition, the cooling rate of the first metal layer closer to the conveyor roll 20 is naturally larger than the cooling rate of the second metal layer.

  FIG. 25 is a photograph showing the effect of improving the flatness by the leveling roll 70. FIG. 25 (a) is a photograph of the clad metal plate 100 cast without using the leveling roll 70 in the third embodiment, and FIG. 25 (b) shows the leveling roll 70 in the third example. 2 is a photograph of a cast clad metal plate 100. In any photograph, the horizontal direction in the figure corresponds to the width direction of the clad metal plate 100. Referring to FIG. 25, the clad metal plate 100 that does not use the leveling roll 70 has fine irregularities extending in the longitudinal direction, whereas the clad metal plate 100 that uses the leveling roll 70 has irregularities. Is hardly observed, and the flatness in the width direction is improved as much as possible and is smooth.

  The above description is for explaining the present invention, and should not be construed as limiting the invention described in the claims or limiting the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims.

10 Metal plate manufacturing apparatus 20 Conveyor roll (conveyor means)
30 1st pool 40 1st plate 50 2nd pool 60 2nd plate 70 Leveling roll (equalizing means)
80 first metal melt 83 first metal layer 90 second metal melt 91 second metal solidified layer 92 second metal melt layer 93 second metal layer 100 clad metal plate

Claims (8)

Conveyor means having cooling ability and traveling;
A first pool formed on the conveyor means for storing a first molten metal;
A second pool for storing a second molten metal formed on the conveyor means and provided in front of the conveyor means in the running direction of the first pool;
With
The first pool is surrounded by the surface of the conveyor means, a first plate located in front of the conveyor means in the running direction, a rear member located in the running direction of the first plate, and both side members. And
The conveyor means travels with the first metal layer while cooling the first metal melt in the first pool to form a semi-solid or solidified first metal layer on the surface of the conveyor means. And
The first plate has a front end portion and is movably provided so that the distance between the first plate front end portion and the surface of the conveyor means can be changed, and moves as the conveyor means travels. The front end of the first plate is urged so that it always abuts with a constant force so that the solidified state layer and / or the semisolid state layer of the first metal passes but the molten metal does not pass. ,
The second pool includes a solidified layer and / or semi-solidified layer surface of the first metal formed on the conveyor means in the first pool, and a second plate positioned in front of the conveyor means in the running direction. And the first plate located behind the conveyor means in the running direction, and both side members, and solidifying the first metal formed on the conveyor means in the second pool The second metal in the second pool is laminated on the surface of the state layer and / or the semi-solid state layer to form a second metal layer in a solid state, a semi-solid state or a molten state, by running the conveyor means. It is supposed to move,
The second plate is configured to allow passage of the second metal in a molten state having a thickness equal to or less than a certain thickness. In the case of a plate having a leg portion and a passage portion at the tip of the second plate, The flow rate of the second metal is adjusted according to the height of the passage portion, and in the case of a plate having a shape that does not have a leg portion at the tip of the second plate, the biasing force that keeps the tip of the second plate at a constant height causes the first metal to flow. Adjusting the flow rate of two metals, or adjusting the flow rate of the second metal according to the height position of the tip of the second plate;
Means for preventing the molten metal after passing through the second plate from flowing to the side surface of the traveling means;
A metal plate manufacturing apparatus for manufacturing a multilayer metal plate. In front of the second plate in the running direction of the conveyor means, there is provided a leveling means facing the conveyor means and touching the unsolidified surface of the second metal.
The metal plate manufacturing apparatus which manufactures the multilayer metal plate of Claim 1. The conveyor means is a first roll having a circular outer peripheral section,
The leveling means is a second roll having a rotation axis parallel to the rotation axis of the first roll, rotating in the opposite direction to the first roll, and having cooling ability.
The metal plate manufacturing apparatus which manufactures the multilayer metal plate of Claim 2. The leveling means is a third plate biased to contact the surface of the second metal.
The metal plate manufacturing apparatus which manufactures the multilayer metal plate of Claim 2. The first metal and the second metal are magnesium alloys, or the first metal and the second metal are aluminum alloys;
The metal plate manufacturing apparatus which manufactures the multilayer metal plate in any one of Claims 1 thru | or 4. A method of manufacturing a metal plate using the metal plate manufacturing apparatus according to any one of claims 1 to 5,
Pouring the first metal melt and the second metal melt into the first pool and the second pool, respectively;
Running the conveyor means,
The first molten metal in the first pool is cooled by the conveyor means to form a first metal layer having a solidified layer and / or a semi-solidified layer on the surface of the conveyor means, and the first metal Passing a layer through the tip of the first plate into the second pool;
In the second pool, the gap holding means for the second plate while forming the second metal layer in a solidified state, a semi-solid state or a molten state at least below a certain thickness difference on the first metal layer. In order to form at least a molten second metal on the first metal layer by passing
A metal plate manufacturing method for manufacturing a plurality of metal plates. A clad metal plate in which a magnesium or magnesium alloy metal layer is formed on a magnesium or magnesium alloy metal layer, both the metal layers having a cast structure,
A clad metal plate characterized by the above. The metal layer has a refined structure formed by rapid cooling,
The clad metal plate according to claim 7.