KR101061733B1 - Disks of aluminum bronze butterfly valves made from low pressure castings containing copper and aluminum and methods for their preparation - Google Patents

Abstract

The present invention relates to a disk of an aluminum bronze series butterfly valve made of low pressure casting containing copper and aluminum and a method of manufacturing the same. In the method of manufacturing a disk of a butterfly valve, a molten metal containing aluminum is contained in copper. The manufacturing step and the step of manufacturing the disc of the butterfly valve using the low pressure casting method, the step of manufacturing the disc of the butterfly valve using the low pressure casting method, the crucible for low pressure casting It provides a method of manufacturing a butterfly valve disk comprising the steps of injecting the inside, injecting molten metal into the mold by applying pressure to the inside of the crucible and cooling the molten metal in the mold and a disk manufactured by the same do.

Thus, the present invention can produce a butterfly valve disk of aluminum bronze alloy through a low pressure casting method. In addition, according to the present invention, it is possible to manufacture a high-quality disc by reducing the internal defects of the disc of the aluminum bronze alloy by low pressure casting, it is possible to increase the production cost by increasing the recovery rate of the molten metal.

Butterfly Valve, Disc, Low Pressure Casting, Aluminum Bronze Alloy

Description

DISK OF BUTTERFLY VALVE AND MEHTOD OF MANUFACTURING THE SAME} Aluminum Bronze Butterfly Valve Made of Low Pressure Casting Containing Copper and Aluminum

The present invention relates to a disk of an aluminum bronze butterfly valve made of low pressure casting containing copper and aluminum and a method of manufacturing the same. The disk of a butterfly valve is manufactured by using a low pressure casting method using a copper alloy series containing aluminum. It relates to a disk of an aluminum bronze-based butterfly valve made of low pressure casting containing copper and aluminum and a method of manufacturing the same.

In general, the butterfly valve is installed on a pipeline that supplies various types of water, such as drinking water, industrial water, agricultural water, sewage, and wastewater treatment plants. Says the valve.

These butterfly valves are widely used in the construction field, buildings, apartments, industrial plants, factories, sewage and wastewater treatment plants, water purification plants.

For example, the butterfly valve (Butterfly valve) is installed on the pipeline for transporting fluids, such as various industrial water, sea water, waste water or chemical drugs, the disk inside the body rotates as the handle rotates It is used to control the flow of the fluid by blocking or opening.

Such butterfly valves can be divided into general concentric type butterfly valves and double eccentric type butterfly valves. In recent years, the double eccentric type can minimize the friction between the disc and the valve seat. Butterfly valves are mainstream.

Usually, the butterfly valve is installed in the valve body connected to the pipeline so that the disk is rotatably installed by the stem, and the disk is installed in such a way that the disk is rotated by the drive of the drive or the handle connected to the stem to open and close the pipeline. To control.

In such a butterfly valve, the performance of the disks determines the performance of the entire valve. In the case of such a butterfly valve disk, copper was conventionally produced by a die casting method and a high pressure solidification method. As a result, problems such as deterioration of the product quality of the disk, such as internal defects, occur, resulting in poor hydraulic pressure. In addition, shrinkage defects occurred, and the recovery rate of the molten metal was low, causing a problem of increasing production cost.

The present invention has been made to solve the above-mentioned problems, using a copper alloy containing aluminum, the low pressure casting method through the disc is less internal defects than the existing copper disk, less dissipation of the bath is possible, It is an object of the present invention to provide a disk of an aluminum bronze-based butterfly valve made of low pressure casting containing copper and aluminum and a method for producing the same, which can obtain a product of which the high recovery rate of the hot water can increase the production cost. .

A method for producing a disk of an aluminum bronze-based butterfly valve made of low pressure casting containing copper and aluminum for achieving the above object, the method comprising the steps of: manufacturing a molten aluminum containing copper; And manufacturing a disk of a butterfly valve using the low pressure casting method, and manufacturing a disk of the butterfly valve using the low pressure casting method, injecting the molten metal into a low pressure casting crucible. Making; Injecting molten metal into the mold by applying pressure to the inside of the crucible; And it provides a method for producing a disk of the butterfly valve comprising the step of cooling the molten metal in the mold.

The mold is located above the crucible, and the molten metal is injected into the mold in a direction opposite to gravity due to the pressure inside the crucible.

The pressure in the crucible is 0.01 to 0.05MPa, and after cooling the molten metal in the mold, includes removing the pressure in the crucible.

In the preparing of the molten metal, 2.5 to 4.0 wt% of iron Fe and 8.5 to 9.5 wt% of aluminum are added to copper.

In the manufacturing of the molten metal, it may further include at least one impurity element of C, Mn, P, S, Si, Ni, Cr, B, Nb and W in the range of 0.01 to 1 wt%, respectively.

In addition, in the disk of the butterfly valve according to the present invention, a material containing 2.5 to 4.0 wt% of iron (Fe), 8.5 to 9.5 wt% of aluminum (Al) and the remaining amount of copper (Cu), and low pressure Provided are a disk of a butterfly valve manufactured by a low pressure casting method by a casting apparatus.

Each of the material may further include at least one impurity element of C, Mn, P, S, Si, Ni, Cr, B, Nb, and W in the range of 0.01 to 1 wt%.

According to the present invention described above, the butterfly valve disk of the copper alloy containing aluminum can be produced through the low pressure casting method. In addition, according to the present invention, by reducing the internal defects of the disk of the copper alloy material containing aluminum in copper, it is possible to manufacture a high-quality disk, it is possible to increase the production cost by increasing the recovery rate of the molten metal.

The present invention is not limited to the embodiments described below but may be implemented in various different forms. That is, the embodiments to be described below are provided to make the disclosure of the present invention complete and to fully inform those skilled in the art the scope of the present invention, the scope of the present invention is understood by the claims of the present application. Should be.

Hereinafter, an embodiment of the present invention will be described in detail.

1 is a view of a butterfly valve according to an embodiment of the present invention.

As shown in FIG. 1, the butterfly valve includes a valve body 10 installed on a conduit, a stem 11 rotatable by external operation, and supported by the stem 11 and of the valve body 10. A disk 12 disposed therein, a seat 13 mounted on an inner circumference of the valve body 10 and sealing a fluid such as industrial water while contacting the outer circumferential seat surface of the disk 12; It consists of a structure including a bolt (14) or a pin or the like to couple the 11 and the disk 12.

Here, the stem 11 is rotated by an automatic driving means, for example, a cylinder or a motor, or a manual type handle, and the seat 13 is durable and corrosion resistant to high temperature or high pressure fluids, chemicals, and the like. Rubber materials, EPDM, FP, etc. are used to have

The valve body 10 is a part connected to the pipeline, and forms a circular fluid passage therein, and is provided with a stem support portion 16 above and below for supporting both ends of the stem 11.

The valve body 10 is treated with an epoxy coating as a whole can exhibit an excellent effect on corrosion.

The stem 11 is a rotary part installed on the upper and lower stem support portions 16 of the valve body 10 in such a way that the upper and lower portions thereof are supported. The stem 11 functions as a central axis when the disk 12 is rotated. The upper portion of the stem 11 is exposed to the outside of the valve body 10, the exposed portion at this time is connected to the drive means (not shown) side is provided with the operating force. At this time, the driving means may be a lever, a gear, pneumatic, electric, hydraulic or other various means of driving means.

The disk 12 is a disk-shaped component which is arranged concentrically on the fluid passage of the valve body 10 to substantially open and close the fluid passage, and is supported by a binding structure with the stem 11, and the stem rotates. It plays a role in controlling the flow of fluid while rotating together. In particular, the disk 12 is provided with a stem coupling portion 17 formed along the radial direction past the center of the disc, so that the disk 12 is screwed with the stem 11 and the screw through the stem coupling portion 17. The fastening structure, ie, the threaded portion 18, can be integrally operated.

The disk 12 is made of a copper alloy material containing aluminum in copper. In addition, it is effective that the surface of the disk 12 is polished. Through this, it is possible to completely eliminate the phenomenon of jamming of impurities or foreign substances.

In the present invention, an aluminum bronze series is used as the material of the disk 12, and this is produced by a low pressure casting method.

First, the material of the disk 12 includes 2.5 to 4.0 wt% of iron (Fe), 8.5 to 9.5 wt% of aluminum (Al), and the remaining content (ie, 86.5 to 89.0 wt%) of copper (Cu). do.

And the disk 12 of the above-mentioned content is manufactured by the low pressure casting method. That is, the low pressure casting method applies a low pressure air or inert gas of about 0.01 to 0.05 MPa to the molten metal surface installed in a closed furnace to push the molten metal in the opposite direction to gravity through the hot water pipe installed in the crucible. Inject into the mold installed on the top (ie the mold).

This embodiment manufactures the disk 12 through a low pressure casting technique. Such low pressure casting technology has started the casting of brass in the domestic faucet industry, and is currently operating with great results. As described above, the present invention is a copper alloy material containing aluminum in copper, and low-pressure casting of the disk material of the butterfly valve to improve the pressure resistance of the product. Improve the mechanical properties of the product. Increase the recovery of the cast product. Reduction of work man-hours due to the pressure and cutting of the injection hole Preventing unnecessary accidents in transporting the molten metal due to human safety The production cost can be greatly reduced.

As described above, when the disk of the copper alloy material containing aluminum in copper is manufactured using the low pressure casting technique, the following effects can be obtained.

The use of low pressure casting techniques saves the melt used to make the disc. In the mold casting method, the molten metal and the molten metal are required to have 2.5 ~ 3 times of molten metal and the casting recovery rate is only 50% ~ 60%. However, in the low pressure casting method, if the pressure is removed when the molten metal solidifies, The return rate is high and the casting recovery rate is high because no hot water is required. Casting recovery rate of low pressure casting method is 90 ~ 98%, which is much higher than 50 ~ 60% of casting method using foundry sand.

In addition, since the directional solidification is easily performed by the low pressure casting technique, the generation of porous defects and shrinkage pores is small, and the density of the casting is high, so that the reliability of the mechanical strength is high. In addition, since the crucible is hermetically sealed, there is less oxidation of the molten metal and less mixing of oxides at the time of injection. Of course, the dimensional accuracy and casting surface are beautiful. In most cases, no pressure is required, which reduces post-treatment and processing costs. Low pressure casting can control the molten metal injection speed and can easily control the device operation. Castings of relatively complex shapes or of saldumega thin castings are also possible. It is possible to manufacture large castings, and the equipment cost is low.

2 is a view for explaining a low pressure casting method according to an embodiment.

As shown in FIG. 2, the low pressure casting apparatus is provided in the crucible 100, the hot water supply pipe 110, and the crucible 100, and the molten metal 120 in which iron, aluminum, and copper are melted in a content within the above range. And, the molten metal 120 is injected through the hot water supply pipe 110 includes a mold.

And, the outer side of the crucible 100 is provided with a heat insulating path. At this time, the mold is located above the crucible 100. In addition, an air inlet for injecting compressed air into the crucible 100 is further provided.

As mentioned above, a molten metal 120 containing 2.5 to 4.0 wt% of iron (Fe), 8.5 to 9.5 wt% of aluminum (Al), and the remaining content (ie, 86.5 to 89.0 wt%) of copper (Cu) When the air is injected into the crucible 100 with), the molten metal 120 is injected into the mold by taking the hot water pipe 110. The molten metal 120 thus injected is solidified in the mold. This produces a disk of the butterfly valve of the present embodiment. At this time, the molten metal below the hot water is returned to the crucible 100 by flowing the hot water pipe back.

In this case, although the use of a mold as a casting material has been described, the present invention is not limited thereto, and a strong sand mold such as a shell mold or a CO ₂ mold may be used. Also, a shell core or the like can be used. And airtight resistance, such as graphite, and a heat resistant material can be used for a hot water supply pipe and a crucible. It is also possible to cast alloys such as Cu alloy cast iron.

As described above, 2.5 to 4.0 wt% of iron (Fe), 8.5 to 9.5 wt% of aluminum (Al), and the remaining content (ie, 86.5 to 89.0 wt%) of copper (Cu) were used. In addition, the low pressure casting method can produce a high quality butterfly valve disc with less internal defects. At present, there is no domestic or foreign company that manufactures a disk of a butterfly valve by producing an aluminum bronze-based alloy containing aluminum by low pressure casting. Accordingly, the present invention produced a butterfly valve disk containing the above elements (Fe, Al, Cu) in the content range by a low pressure casting method.

This makes it possible to produce high quality butterfly valve discs. In addition, due to the low pressure casting, hot water (2.5 to 4.0 wt% iron (Fe), 8.5 to 9.5 wt% aluminum (Al) and the remaining content (ie, 86.5 to 89.0 wt%) copper ( It is possible to manufacture high quality butterfly valve disc because it is possible to change the pouring speed freely according to the control of the pressurizing condition when pressing).

In addition, since the molten metal is quietly injected through the stoke of the clean bath, the AlO ₃ oxide film is introduced into the mold without breaking, thereby making a disc free from slag, thereby preventing a hydraulic pressure failure. In addition, by controlling the cooling of each part of the mold, the mold can be controlled to relatively easily direct directional solidification toward the spout, thereby eliminating shrinkage defect defects. As the molten metal flows, there is no floating of the core due to the flow of molten metal, and sufficient pressure can be given by adjusting the timing of the pressure and the medium pressure applied to the molten surface.

In addition, the size of the hot water can be reduced, and the injected product of the hot water injected through the throttle solidifies, and the molten metal of the hot water flows down to the crucible, recovering up to 80-90% higher than the 45-60% recovery rate in the sand casting. Increasing production costs can be reduced. In addition, since no sand is used because no casting sand is used, it is possible to improve the workplace environment.

In addition, it can reduce the production cost through the low pressure casting to eliminate the need for molding workers, and can prevent safety accidents because the molten metal is not transported from the furnace to the manpower. The surface of the product is beautiful and the size is precise, and the product is quickly cooled by the mold, and the mechanical properties of the product are improved by preventing segregation such as Al, Cu, and Fe. In addition, melted crucibles are sealed to prevent gas absorption and reduce oxidation of the molten metal.

Looking at the manufacturing method of such a disk 12, the molten metal is added to the iron and aluminum. That is, 2.5 to 4.0 wt% of iron (Fe), 8.5 to 9.5 wt% of aluminum (Al), and 86.5 to 89.0 wt% of copper (Cu) are dissolved in the molten metal.

The molten metal is injected into the crucible 100. Subsequently, a disk-shaped mold is provided above the crucible 100. Subsequently, air or an inert gas is injected into the crucible 100 to maintain an internal pressure in the range of 0.01 to 0.05 MPa. Through this, the molten metal of the crucible 100 is injected into the mold above the crucible 100 and cast according to the shape of the mold. Thereafter, when the pressure of the crucible 100 is removed, the remaining molten metal is recovered to the crucible 100, and the disk 12 of the present embodiment is manufactured inside the mold.

By incorporating the iron and aluminum in the above range in the copper it is possible to produce a high-quality disk 12 with less internal defects of the disk 12.

In addition, in the disc of the butterfly valve of the present embodiment, each of the impurity element of at least any one of C, Mn, P, S, Si, Ni, Cr, B, Nb and W in the range of 0.01 to 1 wt% can do. At this time, when the impurity element is added, it is preferable that the content of copper is controlled. For example, when Ni is added, the disk 12 has 2.5 to 4.0 wt% iron (Fe), 8.5 to 9.5 wt% aluminum (Al), 0.01 to 1 wt% C and 85.5 to 88.99 wt % Copper (Cu). In addition, when all of the above elements are included, the disk 12 is 2.5 to 4.0wt% iron (Fe), 8.5 to 9.5wt% aluminum (Al), 0.01 to 1wt% C, 0.01 to 1wt% Mn, 0.01-1 wt% P, 0.01-1 wt% S, 0.01-1 wt% Si, 0.01-1 wt% Ni, 0.01-1 wt% Cr, 0.01-1 wt% B, 0.01-1 wt% Nb and 0.01-1 wt% W and 76.5-88.9 wt% copper (Cu).

In the present invention, the difference between aluminum alloy casting and copper alloy casting is that the specific gravity of aluminum is 2.7, the specific gravity of anti-copper casting is 8.7, and the specific gravity of aluminum bronze is 8.3 when the pressure-controlled brass injection temperature of gas is 1000 ° C. When the temperature is 1150 ℃, the security of the hot water pipe of the hot water pipe due to the increase in temperature is secured and the cooling device of the mold is secured.

1 is a view of a butterfly valve according to an embodiment of the present invention.

2 is a view for explaining a low pressure casting method according to an embodiment.

<Description of Major Symbols in Drawing>

10: valve body 11: stem

12 disc 13 sheet

14 bolt 100 crucible

110: hot water pipe 120: molten metal

Claims (7)

delete delete delete In the method for producing a disk of an aluminum bronze-based butterfly valve made of low pressure casting containing copper and aluminum, Preparing a molten metal by adding 2.5 to 4.0 wt% of iron Fe and 8.5 to 9.5 wt% of aluminum to copper; And Comprising the step of producing a disk of the butterfly valve using the low pressure casting method, Manufacturing the disk of the butterfly valve using the low pressure casting method, Injecting the molten metal into a crucible for low pressure casting; Injecting molten metal into the mold by applying pressure to the inside of the crucible; And Cooling the molten metal in the mold; The mold is located above the crucible, and the molten metal is injected into the mold by moving in the opposite direction to gravity due to the pressure inside the crucible. The pressure inside the crucible is 0.01 to 0.05MPa, After cooling the molten metal in the mold, removing the pressure in the crucible. 5. The method of claim 4, In the step of preparing the molten metal, A method of making a disk of a butterfly valve, the method further comprising impurity elements of at least one of C, Mn, P, S, Si, Ni, Cr, B, Nb and W, each in the range of 0.01 to 1 wt%. In the disk of the butterfly valve, A disk of a butterfly valve manufactured by a material containing 2.5 to 4.0 wt% of iron (Fe), 8.5 to 9.5 wt% of aluminum (Al) and the remaining amount of copper (Cu), and a low pressure casting method using a low pressure casting device. . The method of claim 6, A disk of a butterfly valve further comprising at least one impurity element of C, Mn, P, S, Si, Ni, Cr, B, Nb and W in the material, respectively, in a range of 0.01 to 1 wt%.

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