KR100721924B1 - Cooling apparatus for Wheel mold continuous casting of aluminum alloy - Google Patents

Abstract

Provided is a chiller for a wheel mold continuous casting machine. The cooling device has a cooling wheel having a plurality of cooling water passages extending radially from the center. Cooling water nozzles arranged in a zigzag along the circumferential direction of the cooling wheel are disposed on the cooling wheel so as to communicate with the cooling water passage to inject cooling water into the wheel mold thereon. The flow meter adjusts the amount of cooling water supplied to each of the cooling water passages.

Wheel Mold, Aluminum, Continuous Casting, Coolant Nozzle

Description

Cooling apparatus for Wheel mold continuous casting of aluminum alloy}

1 is a schematic diagram of a wheel mold continuous casting machine having a cooling apparatus according to an embodiment of the present invention.

Figure 2 is a front schematic view of the cooling apparatus for a wheel mold continuous casting machine according to an embodiment of the present invention shown in FIG.

Figure 3 is a plan view showing the coolant nozzle distribution of the cooling apparatus for a wheel mold continuous casting machine according to an embodiment of the present invention.

* Description of the main parts of the drawing *

1: wheel mold 2: coolant nozzle

3: cooling water passage 4: cooling water control valve

5: flow meter 6: distribution valve

7: Control panel 8, 9: Thermocouple

10: monitoring window 11: cooling wheel

The present invention relates to a wheel mold continuous casting apparatus, and in particular, by continuously arranging nozzles to allow quantitative cooling water adjustment during continuous casting to allow sufficient cooling of the wheel mold, thereby enabling continuous casting of a medium / high strength aluminum alloy. The present invention relates to a wheel mold continuous casting apparatus capable of forcibly cooling from each coolant nozzle installed inside a wheel mold to obtain a sound aluminum alloy cast without casting defects.

The manufacturing technology of aluminum or aluminum alloy has been mainly used to manufacture products that have undergone a process such as billet casting and extrusion using a die casting method or semi-continuous casting. On the other hand, the manufacturing technology of the product through continuous casting rolling has been limited to pure aluminum for wire production. In addition, the bar and wire manufacturing technology using the medium / high strength aluminum continuous casting rolling process is made in some developed countries, but the introduction of the technology and apparatus is rare.

Representative technology of aluminum continuous casting rolling technology is owned by PROPERZI of Italy and SOUTHWIRE of USA, and they also cast aluminum rods and wires by continuous casting of pure aluminum in wheel mold type. Manufacture. Detailed techniques for this include continuous casting mold materials, mold shapes and continuous multi-stage rolling mills, and the like, for example, disclosed in US Pat. Nos. 6,083,328, 4,287,934, and 5,392,624.

Prior patents for the wheel mold continuous casting device as described above are disclosed for the cooling device in pure aluminum wheel mold continuous casting, but not for the coolant nozzle arrangement and distribution. In addition, continuous casting of a medium / high strength aluminum alloy having a large liquid coexistence section with a wheel mold using the wheel mold continuous casting apparatus disclosed in the above patents, casting defects are generated on the surface and inside of the casting during solidification, thereby continuously rolling. This can adversely affect cutting, rod and wire surface and internal structure, leading to deterioration of the final product.

The technical problem to be achieved by the present invention is to build a solidification control system by controlling the amount of cooling water for cooling the mold during the continuous casting of the aluminum alloy, forming a method of arranging the cooling water nozzles for cooling by mold zone, and measuring the cooling water in / out temperature The present invention provides a wheel mold continuous casting device capable of improving productivity by eliminating various surface defects and internal defects generated during continuous casting and increasing casting speed.

In order to achieve the above technical problem, the present invention provides a cooling device for a wheel mold continuous casting machine. The cooling device has a cooling wheel having a plurality of cooling water passages extending radially from the center. Cooling water nozzles arranged in a zigzag along the circumferential direction of the cooling wheel are disposed on the cooling wheel so as to communicate with the cooling water passage to inject cooling water into the wheel mold thereon. The flow meter adjusts the amount of cooling water supplied to each of the cooling water passages.

The cooling water passage extends to equally divide the cooling wheel into eight cooling sections in the circumferential direction, and the same number of cooling water nozzles may be arranged in a jig zag in each cooling section.

The coolant nozzles may spray coolant at a flow rate of 10 to 180 l / min and an injection angle of 40 degrees based on a water pressure of 1 to 3 Kg / cm ² .

The wheel mold may have a cross-sectional shape of the 'M' shape.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed subject matter is thorough and complete, and that the scope of the invention to those skilled in the art will fully convey.

1 is a schematic view of a wheel mold continuous casting machine having a cooling device according to an embodiment of the present invention, Figure 2 is a front schematic view of the cooling device for a wheel mold continuous casting machine according to an embodiment of the present invention shown in FIG. to be. 3 is a plan view showing a coolant nozzle distribution of a cooling apparatus for a wheel mold continuous casting machine according to an embodiment of the present invention.

1 to 3, a wheel mold 1 for solidifying molten aluminum and a coolant nozzle 2 for directly cooling the wheel mold 1 are provided below. The cooling water nozzle 2 is arranged on a cooling wheel 11 having a number of cooling water passages 3 extending radially from the center. The coolant nozzle 2 may be made of copper or copper alloy having good electrical conductivity, and may spray coolant at a flow rate of 12.2 L and an injection angle of 40 degrees based on a water pressure of ² Kg / cm ² . A total of eight coolant passages 3 may be installed to equally divide the cooling wheel 11 into eight cooling sections in the circumferential direction. In addition, the coolant inlet connected to each coolant passage 3 is provided with a coolant control valve 4 and a flow meter 5 on the distribution valve 6 installed in the control panel 7 to quantitatively control the amount of coolant in each section. It is installed.

Cooling water that cools the wheel mold 1 exits the passage next to the cooling water nozzle 2 and circulates through the thermocouples 8 and 9 with the drip tray. The thermocouples 8 and 9 are installed at the cooling water in / out port, and are an important measure of the cooling ability of the mold 2 when the molten aluminum is injected. In addition, a total of 12 monitoring windows 10 are installed to observe whether or not the coolant is ejected from the coolant nozzle 2 when the wheel mold 1 is rotated.

The cooling water nozzles 2 may be arranged in a zigzag shape on the cooling wheel 11, and a total of 15 cooling nozzles 2 may be disposed in each cooling section partitioned by the cooling water passage 3. As shown in FIG. 1, the wheel mold 1 may be a copper alloy mold having a 'M' cross-sectional shape. According to the present invention, since the cooling water nozzles 2 are arranged in a zigzag shape, sufficient cooling capacity can be given to the wheel mold 1 than when the cooling water nozzles 2 are arranged in a row on the cooling wheel 11. Therefore, the cooling apparatus according to the present invention can be applied to continuous casting of medium / high strength aluminum alloy having a large liquid coexistence section with sufficient consideration for mold mold.

Although aluminum alloys are lighter and more expensive than conventional steel materials due to their excellent physical properties and processability, their use is expanding to transport equipment, machinery parts, construction materials, and leisure products such as automobiles and aircrafts. However, it is currently used as an industrial material by various methods such as rolling, extrusion, forging and casting from ingots, and most of the sheet materials by rolling and moldings by extrusion are used.

Among the aluminum alloys, 6061 alloy, which is classified as medium strength, has high corrosion resistance, welding, and processability, and its usage is continuously increasing in parts of ships / sea transport, road and building materials, and sporting goods. .

Therefore, in the present invention, wheel mold continuous casting is performed to manufacture rods and wire rods through continuous casting rolling of the selected medium-strength aluminum 6061 alloy in consideration of the amount of use and applicability of the aluminum alloy. First, 6061 alloy is an aluminum alloy containing 0.8-1.2% by weight of magnesium, 0.4-0.8% by weight of the main alloy element, and has a liquid-liquid coexisting section of about 70 ° C with a liquidus line of 650 ° C and a solidus line of 582 ° C. In the present invention, 6061 aluminum molten metal dissolved by electric resistance heating is sufficiently degassed using argon gas in a heating furnace, followed by tapping at about 740 ° C., and staying in a preheated tundish along the heated furnace for 5 hours. The aluminum alloy molten metal is injected into the wheel mold through the head box inserted into the square-shaped copper alloy mold, and the aluminum molten metal is maintained at about 690 ° C. during the injection.

When the aluminum alloy molten metal is injected into the copper alloy wheel mold 1, the wheel mold starts to rotate clockwise, and the aluminum molten metal is continuously supplied through the head box. As shown in FIG. 2, the molten aluminum is directly cooled by the coolant injected through the coolant nozzle 2 through the coolant passage 3, which is divided into eight sections. Thus solidified on the wheel mold 1. The molten aluminum is solidified by the coolant sprayed directly on the iron belt above the mold as well as the coolant nozzle 2 below the wheel mold 1.

Meanwhile, the amount of cooling water controlled by the flow meter 5 installed in the control panel 7 and injected through the cooling water nozzle 2 is 10 to 180 L / min based on the water pressure of 1 to 3 Kg / cm ² . It can have a flow rate and an injection angle of 40 degrees. Preferably, it may have a flow rate of 12.2 L / min and an injection angle of 40 degrees, based on a water pressure of 2 Kg / cm ² .

4A and 4B are surface and cross-sectional photographs of aluminum 6061 alloy cast pieces cast using a wheel mold continuous casting machine to which a cooling apparatus according to an embodiment of the present invention is applied, respectively, and FIG. Surface photograph of aluminum 6061 alloy cast using cast wheel continuous casting machine. As described above with reference to FIGS. 4A and 4B, photographs of the cast pieces are arranged by zigzag arrangement of the coolant nozzles.

As shown in Figures 4a and 4b, the casting cast by arranging the cooling water nozzles in a zigzag can be cast without a surface defect, the equiaxed crystal structure in the center (A), columnar top in the outer shell (B) A typical cast structure with a structure is shown. On the other hand, as shown in FIG. 5, the cast slabs cast by arranging the coolant nozzles in a line produced surface cracks due to unsolidification and normal continuous casting was impossible.

As described above, according to the present invention, by arranging the cooling water nozzles in a zigzag and quantitatively controlling the amount of cooling water for each cooling section, the cooling water nozzles have sufficient cooling ability, so that the surface and internal defects of the aluminum continuous cast slab due to rapid solidification and non-solidification It is possible to prevent the cutting of the rolled material during the subsequent multi-stage continuous rolling due to the lowered generation, and to improve the internal and surface quality of the aluminum alloy rod and the wire.

Claims (4)

delete delete A cooling wheel having a plurality of cooling water passages extending radially from the center; Coolant nozzles disposed on the cooling wheel so as to communicate with the cooling water passage and spraying coolant to a wheel mold thereon, the coolant nozzles being arranged in a zigzag along the circumferential direction of the cooling wheel; And a flow meter for adjusting the amount of cooling water supplied to each of the cooling water passages. The coolant nozzles for the wheel mold continuous casting machine, characterized in that for spraying the coolant at a flow rate of 10 ~ 180ℓ / min and a spray angle of 40 degrees based on the water pressure of 1 ~ 3 Kg / cm ² . The method of claim 3, wherein Cooling device for a wheel mold continuous caster, characterized in that the wheel mold has a cross-sectional shape of the 'M' shape.

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