JPH0316214B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating drum type continuous casting apparatus for aluminum and aluminum alloy plates.

To date, aluminum and aluminum alloy sheets have been produced on a large scale by casting molten aluminum or aluminum alloys as slabs.
It is manufactured as a wrought material through surface cutting, hot rolling, and cold rolling.

On the other hand, as a continuous casting method, there is a method developed overseas and introduced to Japan called the "3C method."
This method is known as "continuous metal casting method" according to Japanese Patent No. 293449, and
This involves rotating the rolls while supplying molten metal from the side through a pouring nozzle between two rolls placed one above the other, solidifying the molten metal through contact with the rolls and then rolling to some extent. . However, this method requires large-scale equipment, which requires a large amount of equipment costs reaching hundreds of millions of yen, and is not only troublesome to maintain and manage, but also takes several years to get production on track, resulting in technical and economic problems. involves many difficulties.

On the other hand, "Hazzelt" has also been introduced and put into practical use in Japan. This is a method in which molten metal is supplied between two endless steel belts arranged above and below and rotating in parallel, and is solidified into a plate shape by contacting the two opposing inner surfaces of both belts, but the steel belt has a thin wall. Therefore, the width of the plate that can be cast is limited because it is easily deformed by heat, and the maximum width is 300 mm.

In addition to these methods, there is a method called the horizontal continuous casting method, which uses a metal mold or graphite mold, first brings the tip of the molten metal into contact with a drawer plate, solidifies and adheres to it, and then draws it out horizontally using a drawer plate for casting. However, casting speed is limited and productivity is low.

The present invention overcomes the drawbacks of each of the above-mentioned prior art,
The purpose of this project is to provide a device that continuously casts aluminum plates at a relatively high speed using a rotation method with an equipment cost of approximately 5 to 10 million yen.

In the present invention, the rolling surface side of one rotary drum is held down from the side by a water-cooled mold, and an interval equal to the thickness of the plate material to be cast is maintained between the drum and this holding mold, and hot and top This method rotates the drum while injecting molten metal and draws it out as a thin plate.If the conditions are set appropriately, an intermediate aluminum plate is automatically created, and the width of the plate is equal to the width of the drum and presser die. By changing the thickness, the thickness can be freely changed by moving the presser die closer to or farther away from the drum.

Therefore, there are almost no parts that wear out, such as the slits made of insulation material in the 3C method, and they maintain their cost-saving features. The apparatus of the invention will be described below.

As shown in Fig. 1, a water-cooled rotary drum 11 with a diameter of 1 m is directly connected to a variable speed motor (not shown), and the drum 11 has a drum body and a presser mold at both axially outer ends as shown in Fig. 2A. A disc-shaped flange 12 is provided to prevent the molten metal injected from flowing out to the side. The rotation speed can be changed from 50cm to 500cm/min. That is, the casting speed is 50 cm to 500 cm/min.
As shown in FIG. 1, directly below the drum 11 and presser mold 21, there is a group of pinch rolls 13 arranged along approximately one-quarter of the drum's outer circumference, and the pinch rolls 13 are arranged around one-fourth of the outer circumference of the drum. A cast plate is sandwiched between the rotating drum 11 and the pinch roll group 13 and guided along the drum 11. The cast plate that has left the pinch rolls 13 runs on guide rollers 14 and is sent.

As shown in FIG. 1 and FIG. 2A, a presser mold 21 is mounted on a fixed frame 22 with a width that is almost the same as the axial length of the drum 11, and aluminum and aluminum alloys are cast by operating a handle. The thickness of the plate can be changed from 4 to 20 mm. Further, both the drum 11 and the mold 21 are plated with nickel phosphoric acid, which has a lubricating property. In this nickel phosphate plating, a hardened nickel phosphate plating layer with high wear resistance is formed on the surface of the material by chemical plating by immersing the material to be plated in a nickel phosphate solution. In recent years, the lubricity has improved due to the advancement and development of this matsuki technology.
This method makes casting easier.

Reference numeral 31 denotes a molten metal reservoir for supplying molten metal to the drum 11, which is divided into two chambers, a front chamber 33 and a rear chamber 34, with an intermediate partition wall 32 as a boundary, and the diameter of an opening 35 attached to the intermediate partition wall 32. The amount of hot water supplied is adjusted according to the casting speed by changing the water temperature, and in order to eliminate changes in hot water temperature, the front chamber 33 is covered with an upper lid 33a and kept warm with a heater (not shown). The water reservoir 31 is movable relative to the outer peripheral surface of the drum 11 with respect to the water-cooled presser die 21. Required types of intermediate partition walls 32 with different predetermined hole diameters are prepared in advance.

Molten metal is poured from below the front chamber 33 of the pool 31 through a slit 36 opened diagonally forward toward the drum 11. A guide portion 37 formed integrally with or in close contact with the drum 11 and in pressure contact with the outer peripheral surface of the drum guides the drum 11 against rotation and prevents the molten metal from leaking upward.

If the above-mentioned guide part 37 is not provided, the molten metal will leak upward and adhere to the drum, making it easy for the rolled product to be scratched. The guide portion 37 may be omitted. On the other hand, pinch roll 1
If 3 is not installed, the continuously cast aluminum plate will not only fall away from the surface of the drum due to gravity and fall downward, causing scratches on the rolled plate.
This is indispensable from the point of view of actual operation, as it makes operations such as rolling, cutting, or winding difficult.

When ready, start pouring. A drawer plate 38 inserted in advance between the drum 11 and the presser die 21
Coagulation begins at the part that comes in contact with the So drum 1
1 is rotated, and the solidified molten metal is continuously drawn out as a cast metal plate by a drawing plate 38 which is drawn out by a pull rope 39 at the same speed as the drum.

In this case, the poured metal has finished solidifying at the downstream end of the presser die 21, and the drum 11 rotates with the solidified metal plate, while the presser die 21 is stationary, but the presser die 21 is stationary. The casting plate that has left the lower end of the mold is connected to a pinch roll 13 and a drum 11 disposed along about a quarter circumference of the drum from the lower end of the holding mold.
It is sandwiched between the two and pulled out while being guided. The surface of the metal that is solidified after pouring and is in contact with the presser mold slides relative to the presser mold and is subjected to shear stress. Therefore, the metal plate in contact with the surface of the drum 11 is smooth, but the presser mold 21
Since the surface in contact with the drum is subjected to shearing force as described above, it is somewhat rougher than the surface in contact with the drum, but this poses no problem in use. The drawer plate 38 and the cast plate are water-cooled by the shower from the nozzle 23 of the water-cooled presser die 21, and the insufficient cooling is cooled by the shower 24 installed separately.

Example The drum 11 and presser die 21 were preheated to about 70°C, and seed oil was applied as a lubricating oil. Drawer board 38
After setting, the hot water reservoir 31 is set on the mold, and the hot water leakage prevention guide part 37 is brought into contact with the drum.

When the aluminum ingot is melted and the casting temperature is 720°C, and two openings 35 with a hole diameter of 5 mm are provided in the middle partition wall 32 of the sump 31, a plate with a width of 400 mm and a thickness of 8 mm is pulled out at a drawing speed of 1 m/min. I was able to pull it out. The surface of the board was smooth, and the surface in contact with the drum was especially shiny and beautiful. The macrostructure of this cross section is shown in FIG. In particular, when the presser mold was vibrated with a vibrator, the microstructure was fine.

In addition, when the molten metal surface of the aluminum base metal poured into the molten metal pool 31 is always kept above the lith 36 to create a hot or top state where a feeder effect can be obtained, the resulting aluminum cast plate Both surfaces were clean. Furthermore, by supplying seed oil to the packing portion 25, the surface of the plate in contact with the mold 21 could be made even smoother.

As shown in FIG. 1, this gasket 25 is installed between a water pool 31 made of an artificial refractory material and a water-cooled presser mold 21 made of copper or cast iron.
A copper plate is installed in a direction across the drum at the front end facing the drum 11 below the nozzle 36 of No. 1, and its role is to absorb lubricating oil from a copper pipe placed in the groove of the water-cooled presser die 21. This is to prevent water from entering the water reservoir 31 made of fireproof material. As shown in B, C, and D of FIG. 2, the detailed structure is that the copper water-cooled mold 21 has a plurality of parallel grooves 42, and each groove has a depth and an outer diameter. A plurality of 5 mm copper pipes 43 are arranged and housed at intervals of 15 mm between each, and seed oil and the like for lubrication during rolling are supplied inside the pipes.

In Fig. 2B, the gasket 25 made of copper plate has groove 4.
2 and the copper pipe 43,
Even if seed oil for lubrication leaks, this gasket prevents the leaked oil from entering the porous refractory material reservoir.

FIG. 2C is a plan view taken along the line CC of FIG. 2B and viewed below the packing 25 to show the arrangement of the groove 42 and the copper pipe 43. Figure 2D shows
It is a front cross-sectional view taken along the line DD in FIG.

Although this as-cast plate material can be used as sludge for impact presses, it is somewhat inferior to conventional aluminum wrought materials in terms of alumite surface treatment. To improve this point, a cold rolling roll is installed downstream of the guide roller 14 and cold rolling is performed in synchronization with the casting speed, resulting in a smooth surface that is almost the same in appearance as the conventional wrought material. It can also be finished as a foil, making it a satisfactory material for deep-drawn products.

Figure 3 shows a thickness of 10 mm cast using the device of the present invention.
This is a photograph of the cross-sectional macrostructure of a cast plate. There is no difference in structure between the upper and lower sides, and the surface in contact with the rotating drum and the surface in contact with the presser die are solidified under substantially the same conditions. I understand. Figure 4 is a photograph of the surface macrostructure of the same sample as in Figure 3, which shows a fairly fine cast structure.

FIG. 5 is a photograph of the cross-sectional macrostructure of a cast plate made using a graphite mold by the conventional horizontal casting method, and the cast structure is coarser grained than the structure shown in FIG. 3. Figure 6 is an optical micrograph (200X) of a cross section of a cast plate cast according to the present invention, which consists of fairly fine grains, and Figure 7 is an optical micrograph (200X) of a cross section of the same graphite-type cast plate sample as in Figure 5. 200X) and has a much coarser grain than the structure shown in Figure 6.

In this way, the apparatus of the present invention allows casting and solidification to be performed between one rotating drum and a fixed water-cooled presser die, so that a cast plate can be obtained directly from the molten metal, and hot rolling can be performed. Moreover, since it uses a rotating drum method, the casting speed is high and the equipment cost is not very high, so it greatly contributes to improving productivity and reducing equipment costs and maintenance costs.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of the continuous casting apparatus of the present invention;
2A is a cross-sectional plan view of the drum and water-cooled presser die cut along the - line in FIG. 1, FIG. 2B is a partially enlarged side view of the packing part 25 in FIG. 1, and FIG. C is a plan view showing a cross section of a part of the copper pipe as seen from arrow C-C in FIG. 2B, and FIG. 2D is a cross-sectional front view taken along line D-D in FIG. 2C. Figure 3 is a photograph of the cross-sectional macrostructure of the cast plate according to the present invention, Figure 4 is a photograph of the macrostructure of the same cast plate surface as in Figure 3, and Figure 5 is a photograph of the cross-sectional macrostructure of the cast plate according to the present invention. Figures 6 and 7 are photographs of the macrostructure of the cross-section of the obtained cast plate, and are photographs of the structure taken with an optical microscope at a magnification of 200X of the cast plate using the method of the present invention and a graphite mold, respectively. The reference numerals in the drawings and corresponding parts are shown below. 11...Drum, 12...Flange, 13...
Pinch roll, 14... Guide roller, 21...
Water-cooled presser mold, 25... Packing, 31... Hot water reservoir, 36... Slit, 37... Guide portion, 38
...Drawer board.

Claims (1)

[Scope of Claims] 1. A rotating shaft is provided substantially horizontally to receive the molten metal and solidify it on the outer peripheral surface to continuously form a cast plate, and has one flange at each end in the axial direction. A cylindrical drum; provided integrally with a fixed frame along the outer circumferential surface of the drum so as to be closely opposed to the outer circumferential surface of one side of the drum, and between the outer circumferential surface of the drum and the inner circumferential surfaces of the flanges on both sides. a water-cooled presser die having a tip surface that can be adjusted to approach and move away from the drum so as to define a casting gap according to the desired thickness of the cast plate; a slit for storing the molten metal and having a slit at the front end thereof that is opened just above the upper end of the front end surface of the water-cooled presser die and for pouring the molten metal toward the casting gap; a packing part that seals between the molten metal reservoir and the water-cooled presser mold and serves as a passage for supplying lubricating oil immediately below; A drawer plate is used to integrally form a solidified layer of cast metal, and to draw out the solidified cast plate along the outer periphery of the drum at a speed synchronized with the drum as the solidification progresses. and pinch rolls arranged along the circumferential surface of a quarter circumference, for sandwiching the cast plate continuously drawn out by the drawing plate with the drum and transferring it to the downstream side. Continuous casting equipment for aluminum and aluminum alloy plates. 2. A cylindrical drum having a substantially horizontal rotating shaft and having one flange at each end in the axial direction for receiving molten metal and solidifying it on its outer peripheral surface to continuously form a cast plate; A desired thickness of a cast plate is provided integrally with a fixed frame along the outer circumferential surface of the drum so as to be closely opposed to the outer circumferential surface of one side of the drum, and between the outer circumferential surface of the drum and the inner circumferential surfaces of the flanges on both sides. a water-cooled presser mold having a tip surface that can be adjusted to approach and move away from the drum so as to define a casting gap according to the casting temperature; a molten metal reservoir having a slit at the front end thereof that is opened just above the upper end of the tip surface of the water-cooled presser mold and for pouring the molten metal toward the casting gap; A packing part that seals between the water-cooled presser die and serves as a passage for supplying lubricating oil; A packing part that is inserted into the casting gap before starting pouring, and as the metal is poured, a solidified layer of cast metal is formed at the tip thereof. a drawer plate for drawing out the solidified cast plate along the outer periphery of the drum at a speed synchronized with the drum; a guide that protrudes and is pressed against the outer peripheral surface to guide the drum and prevent the molten metal in the casting gap from leaking upward; about a quarter of the drum from below the casting gap; Pinch rolls are arranged along the circumferential surface and are used to sandwich the cast plate, which is continuously drawn out by the draw-out plate, between the drum and the drum and transfer it to the downstream side. Continuous casting equipment for aluminum and aluminum alloy plates.