KR100659505B1 - Stainless steel water valve - Google Patents

Abstract

Water supply articles that are free of substances harmful to the human body such as lead and antimony which are conventionally contained in brass or bronze cast articles in very small quantities, a method for manufacturing the water supply articles using 304 or 316 stainless steel, and a method for manufacturing cast articles using 304 or 316 stainless steel are provided. In a method for manufacturing water supply articles by applying a vacuum precision investment casting method to a 304 or 316 stainless steel casting process, a method for manufacturing stainless steel cast water supply articles comprises: a step of designing and manufacturing a mold capable of manufacturing water supply articles that have standard requirements desired by users and include an internal core structure for guiding and controlling a flow of water; a step of forming a core structure within a wax pattern to inject the wax pattern into half splitted wax patterns; a step of integrally bonding the splitted wax patterns; a step of preparing and manufacturing a casting mold; a dewaxing and casting mold firing step; a step of performing melting and casting of a 304 or 316 stainless steel alloy; and a finishing operation step.

Description

Stainless steel water valves, stainless steel 304 or 316

1: Structure diagram of a water supply line generally used.

Figure 2: faucet casting process according to the conventional method

Figure 3: Illustrated faucet split wax applied to the present invention.

Figure 4: Casting process for obtaining water supplies by vacuum precision casting method

5 is an exemplary process of integrating the divided wax of the present invention by high frequency welding.

6 is an illustration of a union split wax applied to the present invention.

7 is an illustration of the elbow split wax applied to the present invention.

8 is an exemplary view of the water angle valve divided wax as another embodiment of the present invention.

** Description of the symbols for the main parts of the drawings **

10: water supply pipe 20: faucet split wax

21: faucet inlet 22: faucet outlet

23: faucet bottom plate 24: faucet euro flow section

25: faucet inlet hole 26: faucet outlet hole

30: eccentric Union 31: cap

32: Quantity adjusting screw 33: Connecting nut

34: strainer 35: union inlet

36: Union water extraction unit 37: Quantity adjustment screw insertion unit

38: Strainer Cap Insertion 40: Elbow

41: elbow inlet 42: elbow inlet

50: Algle valve 51: Angle valve inlet

52: angle valve outlet portion 53: angle valve valve portion

54: angle valve cap portion 55: angle valve strainer

56: inlet partition bulkhead 57: outlet partition wall

58: valve partition 59: expansion pipe

The present invention is to provide a stainless steel casting water supplies (hereinafter referred to as stainless steel casting water supplies made of S.S) made of SUS 304, 316.

The present application relates to a method for manufacturing a water-related article made of SS, and more particularly, a water-made article made of SS (hereinafter referred to as a water-made article having a core type such as a faucet, an angle valve, a union, and an elbow). In order to obtain the injection molding by using paraffin or wax to obtain a water supply using a modification method of the precision casting method to form an injection molding in the shape of a water supply, it is divided into 1/2 to obtain an injection molded product, The injection molding is integrated by high frequency welding, and the mold is formed by slurry deposition and refractory coating on the preform, and a molten alloy of lost wax, SUS 304 or SUS 316 material is injected and cooled, and the stainless steel casting-related article is processed. It is to provide.

Commonly used faucets, angle valves, unions, elbows, and other water-related items are daily necessities to provide tap water for people to drink every day. In the meantime, through the casting operation using brass, which is an alloy mainly composed of copper (Cu) and zinc (Zn), which has strong corrosion resistance, or bronze, which is an alloy mainly composed of copper (Cu) and tin (Sn), Water-related articles have been cast and used.

Patents related to faucets and faucets surface treatment of water-related articles such as brass or bronze faucets and angle valves which are conventionally plated on the surface are treated with stainless steel to provide a more elegant aesthetic. -0379319.

In this patent, a faucet mold is manufactured by forming a faucet of brass by a brass casting in which copper (Cu) and zinc (Zn) are properly mixed and fused. The faucet formed in this way has a very rough surface. After surface polishing by plating nickel (Ni), and then nickel (Ni) plated surface, and then chrome (Cr) plating, the final surface treatment is resistant to corrosion and gives a silvery white faucet A method is disclosed.

In addition, Patent Publication No. 2004-99729 discloses a 'lead method of removing the faucet' is disclosed a process for manufacturing a mold to remove the lead component of the faucet; Casting and molding a copper alloy melt containing copper and zinc as main components in the mold; Polishing the outer surface of the molding formed in the above step by buffing; Plating nickel on the outer surface of the polished molding to a predetermined thickness; Plating chromium on the nickel plating layer to a predetermined thickness; Rinsing the molded product after the plating is completed with water, and then immersing the molded product in an aqueous sodium hydroxide solution for a predetermined time to remove lead components from the inner surface; Washing the molding again with water to remove the sodium hydroxide component from the surface; Immersing the molding in a phosphate solution for a predetermined time to form a phosphate coating on the surface thereof; Disclosed is a method for reducing lead constituents, which is intended to reduce the leaching value of lead (PB) by performing the various steps of removing the phosphate component on the surface by washing the molded article having the phosphate coating with water.

In addition, the angle valve for water is provided between the inlet side pipe (meter side pipe) and the outlet port pipe (faucet side pipe) to switch the flow of water to 90 degrees,

Examples of such angle valves are described in detail in Utility Model Publication No. 1998-65667 (Dec. 5, 1998) and Registration Utility Model Publication No. 2000-173515 (Dec. 20, 1999).

Applicants have long been producing and supplying water-related articles such as brass and bronze faucets, angle valves, unions, elbows, water meter meters, and the like, in which meantime, harmful components of lead can be detected from brass or bronze casting alloys. A voice of concern has been raised to confirm the fact that the three components of the brass cast water meter, the six bronze cast water meter cores, and the stainless steel cast water meter cores made of SUS 304 are the same specifications. In the dissolution test of brass castings (3 types), lead (Pb) content was detected as 0.5 ~ 3.0 ppm in the dissolution test of brass castings (6 types). Lead (Pb) was detected in 4.0 ~ 6.0 ppm and antimony (Sb) in 0.2 ppm. In dissolution test of stainless steel (SUS 304), lead (Pb) Antimony (Sb) component was not detected, and according to the result, the research to replace the existing brass and bronze water meters, faucets, angle valves, unions, elbows, etc. with stainless steel materials was continued. Has come.

Therefore, the present invention was created to exclude the concern that the above-described conventional brass and bronze water supplies discharge harmful substances, and the present invention can provide SS water supplies made of SUS 304 and 316 on an economic scale. Research has been carried out with the object of the invention to find a casting method.

The company has a voice of concern that lead and antimony components, such as brass and bronze faucets, may be harmful to humans, and lead and antimony components may be detected. The basic components such as faucets, angle valves, unions, elbows, etc. used in tap water supply lines, which should be drunk at least daily, have been started with the task of replacing stainless steel products with no harmful components to the human body. The company started with the technical problem to find a stainless steel casting process and its manufacturing method that can be applied on a realistic economic scale due to the difficulty of the stainless steel casting process and its cost of manufacturing.

Therefore, the present application can provide SS water supplies of SUS 304 or 316 material, which was recognized as not applicable due to the difficulty of the conventional SS core type casting process and its price standard, and thus the SS water supplies of the present application The parts and materials used together with the water supplies are made of engineering plastics with excellent impact resistance and stress, and the other materials are made of stainless steel to provide SS-related water supplies with a structure that basically eliminates contamination. It started with the object of technical problem and invention.

In order to achieve the above object, the present application is to provide a stainless steel casting water supplies made of stainless steel alloy of SUS 304, 316 material using a method of vacuum precision casting.

In general, a faucet used in a general home or an industrial site has a mainstream of a faucet for mixing cold and hot water, in which cold water and hot water are mixed, and a water supply line structure generally used is shown in FIG. 1.

Looking at the water supply line for supplying tap water with reference to the drawings, a water supply pipe 10 for supplying cold and hot water into the wall of the building is constructed, the water supply pipe 10 is elbow 40 to change the flow of water supply The elbow is connected to the faucet 20 on the outside of the wall and the structure in which the eccentric union 30 is connected in the middle constitutes the water supply line.

The present application makes a faucet wax, elbow, union, etc. used in the tap water supply line as described above using a vacuum precision casting deformation method of the present application, and a faucet having a core shape by a method of high frequency fusion of the divided wax. The invention was completed after confirming that it is applicable to all water supplies such as elbow, union and angle valve.

That is, taps, angle valves, elbows, unions, etc., which have a core shape, design and manufacture molds for each model, such as faucets, angle valves, elbows, unions, etc., according to each customer's desired specification. Injection step, high frequency bonding step of integrating divided wax model, mold making step, dewaxing and mold firing step, stainless alloy melting and casting step of SUS 304 or 316 material, finishing work step, heat treatment and calibration work The method of obtaining a stainless steel casting made article including the step, the material and the part property evaluation step can be applied in the same way.

In the present application, the faucet, angle valve, elbow, union, etc. are different in shape and specification, but using the above-described vacuum precision casting method, the same principle and the same casting process and the same technical concept can be provided. I will explain by calling.

The technical feature of the present invention is that by dividing the wax into 1/2 during the design and manufacture of the mold for modeling in manufacturing stainless steel water supplies of SUS 304 and 316 material using vacuum precision casting deformation method. After obtaining the product by integrally joining the divided injection parts by using high frequency to obtain the molded product, it is made of stainless steel of SUS 304 and 316 through dewaxing and casting plastic step, dissolving and casting stainless steel alloy of SUS 304 or 316 material The idea is to get water supplies.

As a process for obtaining stainless steel faucet or angle valve of SUS 304, 316 material of the present application, the designer (consumer) designs a wax mold for water supplies with the desired specification and shape, and divides the wax model into 1/2 according to the design contents. It can be subdivided into injection, fabrication, wax model deformation correction work, wax model integration high frequency bonding step, mold making step, de-waxing and mold firing step, and dissolution of stainless alloy of SUS 304 or 316 material And a casting work step, a finishing work step, a heat treatment and a deformation correcting work step, and a material and part property evaluation step using a destructive and non-destructive method.

Hereinafter, with reference to the drawings presented in order to support and explain the technical spirit of the present invention configured as described above will be described in detail.

FIG. 1 of the present application shows a water supply line structure which is commonly used. Referring to the drawings, a water supply pipe structure for supplying cold and hot water has a water supply pipe 10 for supplying cold and hot water, respectively, in a wall. It is connected to the elbow 40 to change the flow of water supply, the elbow shows a structure in which the eccentric union 30 is connected in the middle to be connected to the faucet 20 outside the wall, the eccentric union (30) When connected to the water supply pipe in the wall, the cap 31 is fitted in order to conceal the unsightly connection part, and the water adjusting screw 32 is fastened to the eccentric union 30 to adjust the water supply amount by tightening the screw. The lower end of the eccentric union 20 has a connection nut 33 connected to the faucet body 10 and a strainer 34 capable of removing foreign substances on one side thereof. The eccentric union (30) structure of the structure provided with) is shown, and the faucet 20 connected with the eccentric union 30 will be described in FIG.

Fig. 2 shows a conventional process diagram showing a faucet manufacturing step, which is a representative example of the water supplies, and a step of manufacturing a mold; Casting and molding a copper alloy melt containing copper and zinc as main components in the mold; Polishing the outer surface of the molding formed in the above step by buffing; Plating nickel on the outer surface of the polished molding to a predetermined thickness; Plating chromium on the nickel plating layer to a predetermined thickness; Rinsing the molded product after the plating is completed with water, and then immersing the molded product in an aqueous sodium hydroxide solution for a predetermined time to remove lead components from the inner surface; Washing the molding again with water to remove the sodium hydroxide component from the surface; Immersing the molding in a phosphate solution for a predetermined time to form a phosphate coating on the surface thereof; Disclosed is a manufacturing process for reducing lead components to reduce the leaching value of lead (PB) by performing a preliminary process of removing the phosphate component on the surface by washing the molded article having the phosphate coating with water.

It is well known that the casting process diagram of FIG. 2 is applied not only to a faucet but also to most casting processes forming core shapes such as angle valves, elbows, and unions.

Figure 3 shows a faucet bar, Figure 3a shows a perspective view of a split wax product obtained as an intermediate product in order to obtain a faucet made of SS in the present invention and 3b shows a side cross-sectional view of a state in which the split wax product is bonded. .

The divided wax product of Figure 3a is divided into divided wax mold a, b, two divided wax 20a, 20b, each of the divided wax inlet 21 and outlet 22, bottom plate 23, flow path It shows the structure which has the flow part 24 and exits the water extraction hole 26 via the water intake hole 25. As shown in FIG.

Figure 4 shows an example of a stainless steel casting manufacturing process for obtaining the water supplies by the vacuum precision casting deformation method carried out in the present application taking an example of the faucet shown in Figure 3, the designer according to the requirements and installation specifications of the customer Design the wax mold faucet mold to the desired standard (a), and to produce a wax model according to the design content in the present invention, the step of dividing the wax model in half (b), the integral bonding step of the wax model ( c) is bonded in a process to explain the specific high-frequency bonding step in Figure 5, the slurry deposition step (d), refractory coating step (e), dewaxing step (f), mold firing step (g) It can be distinguished, and it shows the melting and casting work step (h), finishing work step (i) of stainless steel alloy of SUS 304 or 316 material, and the above processes are performed in vacuum precision casting method. Although the process is partially used in the prior art, the features of the present application are a single circle by integrating the faucet core in a circle in the faucet casting process according to the conventional method in the mold design step (a) and the wax model injection step (b). Since the wax mold was designed and injected, there was no step (c) of integrally joining the wax figures, but in the present invention, the mold design step (a) and the wax model injection step (b) divide the half of the semicircle shape instead of the circular wax mold. It is intended to provide a cast product having economic feasibility by producing a large amount of cast products made of stainless steel, having a feature in the newly introduced method of forming a wax mold and integrating it in step (c).

FIG. 5 shows a process diagram for integrating the split wax model of the present invention by high frequency welding. In FIG. 5A, the bottom plate 23 of the split wax mold is shown in FIG. A cylinder is shown at the lower part of the split wax molds a and b, and B and B 'cylinders are at both ends of the inlet and outlet parts of the split wax molds a and b, and the C cylinder (not shown) is the split wax. The two wax products, which are manufactured separately on the sides of the molds a and b, are joined to each other while supporting each other.

5b is for showing the operating state of 5a. In order to unify the two wax products, which are manufactured separately, the cylinder A supports the bottom plates 23 of the divided wax molds a and b from the lower side, and B and B The cylinder shows a structure in which high frequency welding is carried out and backwards while simultaneously operating and supporting the inlet and outlet portions of the divided wax molds a and b.

In 5c, the C and C 'cylinders support the sides of the split wax molds a and b in order to unify the two separately manufactured wax products, and the B and B' cylinders are provided with the inlet portions of the split wax molds a and b. At both ends of the water outlet, the structure is supported to operate simultaneously.

In 5d, the C and C 'cylinders support the divided wax molds a and b mold sides in order to integrate the two separately manufactured wax products, and the B cylinder supports the water inlet part and the B' cylinder supports the inlet part of the inlet part. It shows that a structure capable of performing welding and reversing is achieved.

Figure 6 shows an embodiment of the SS water eccentric union 30 provided in another embodiment of the present invention, the eccentric union is the water inlet 35 and the water outlet 36, the water adjustment screw insertion ( 37), having a structure having a strainer cap insert 38 having a function of removing foreign substances, and the eccentric union 30 divided wax product of FIG. 6A is divided wax molds a, b, and two divided wax 30a, 30b. When divided into the injection into the divided wax, and briefly referring to the process of performing the high frequency fusion of the divided wax in the process described in Figure 4, the inlet portion 35 and the outlet portion 36 support the A, A 'cylinder from both sides B and B 'cylinders support the quantity adjusting screw insert 37 and the strainer cap insert 38, and C and C' cylinders are supported on both sides of the 30a and 30b split waxes, respectively. As in the embodiment of Fig. 4, the high-frequency welding is performed to unite with the foundry. By the shows that can provide a S.S the eccentric union.

Figure 7 shows an embodiment of the SS water elbow 40 provided in another embodiment of the present invention, the elbow 40 is the inlet portion 41 and the water outlet portion 42 to change the flow of water supply The divided wax product of the elbow 40 of FIG. 7A is divided into the divided wax molds a, b and two into the divided waxes 40a and 40b, and the divided wax is injected into the divided wax. Referring to the process of performing high frequency fusion briefly, each of the inlet portion 41 and the outlet portion 42 is supported by A and B cylinders, and C and C 'cylinders are supported on both sides of the 40a and 40b split waxes. While doing so, as shown in the embodiment of Figure 5 by performing a high frequency fusion to show that the elbow made of SS can be provided by the casting manufacturing process of FIG.

Figure 8 shows an embodiment of the SS water angle valve 50 obtained by another embodiment of the present invention bar 8a is a perspective view of the angle valve made of spun wax, 8b is an angle valve in the assembled state A cross-sectional view is shown, and 8c shows a perspective view of an angle valve in an assembled state, and the angle valve has a structure having an inlet portion 51, an outlet portion 52, a valve portion 53, and a cap portion 54. .

The divided wax products for the angle valve of FIG. 8A are divided into divided wax molds a, b, and two divided into divided wax 50a and 50b, and injected into the divided wax, and performing the high frequency fusion in the divided wax. To briefly refer to the inlet partition 56 and the valve partition 58, the A, A 'cylinder is supported on both sides, and the diaphragm 59 and the outlet partition 57 in the diaphragm 55 The B and B 'cylinders are supported, and the C and C' cylinders are supported at the rear of the 50a and 50b split waxes, and the high frequency fusion is performed as in the embodiment of FIG. The structure which can provide SS angle valve by this is shown.

3 to 8 illustrate the technical concept of providing faucets, eccentric unions and elbows, angle valves, and the like used in SS castings through water supply and supply lines. The eccentric union, elbow, angle valves, etc. can be manufactured in a variety of structures and shapes for each manufacturer, the technical idea of the present application to the conventional casting product casting process forming a core shape by the split wax method of the present application It will be apparent to those skilled in the art that the casting process can be performed to provide SS castings.

That is, the technical idea of the present application is to divide the wax into 1/2 in the step of designing and manufacturing a mold for modeling in manufacturing stainless steel casting products made of SUS 304 and 316 using vacuum precision casting deformation method. After the injection molding is obtained by integrally joining the divided injection parts by using high frequency to obtain the molded product, the stainless steel casting product made of SUS 304 and 316 through de-waxing and molding firing step, melting and casting of stainless alloy of SUS 304 or 316 material It is about a technical idea that can provide.

The method for implementing the technical concept of the present application on the basis of the basic technical configuration may be variously modified, and in addition to the contents described herein, in order to perform the casting process of the present application, various factors may be considered. The technical idea of the present application is to know the result of detecting lead and antimony components harmful to human body in conventional water meter meters made of brass and bronze, and to replace them with SS products. In case of applying the casting process made of SS, it is difficult to apply and the cost of manufacturing cost is high, and while searching for a manufacturing method that can be applied realistically, the conventional vacuum precision casting method is used. In the design and fabrication stage, the wax model is divided into 1/2 injection molding and the high frequency bonding is performed. To solve the difficulties of the SS round casting process by developing a process to integrate, and to provide SS water supplies of SUS 304 or 316 material, which was recognized as not applicable due to the high price standard of SS castings. As a technical idea, those skilled in the art will not have difficulty in forming a casting by the technical idea alone, but look at additional technical elements for precision casting as follows.

In the precision casting, the mold for wax modeling is made. Molding is a very important process that determines the quality of the product because it has a great influence on the size and surface roughness of the casting, and mold design is the product drawing, faucet or angle. The mold dimensions are corrected for the shrinkage rate that matches the material properties of the valve product.

In addition, in precision casting, dimensional deformation occurs due to shrinkage of the wax and expansion of the mold, so the mold dimensions should be corrected in consideration of this value. When this operation is completed, a mold is manufactured by machining using a material having a low thermal deformation and smooth processing, and in this application, in consideration of the above conditions, it is intended to use aluminum 7075-T6 as a wax model material.

In addition, in the present application, in order to lower the manufacturing cost of the casting made of stainless steel and improve the efficiency of the work, the wax is divided and manufactured by integrating it with high frequency welding to obtain a wax pattern tree. Filled wax was used as ceri-TAwax 26-46 standard.

In this application, Crytobalite binder ethyl silicate was used as an investment aggregate as a material used in the manufacture of molds. In addition, in order to use refractories as mold aggregates, the refractories must have an appropriate particle size distribution. Since it is directly related to the strength and the air permeability, it is necessary to select a refractory material having an appropriate particle size distribution. In this application, Zircon 325-400 mesh was used to satisfy the above conditions.

The coating of the wax mold surface on the slurry and coating of the refractory is called coating, and the wax model is deposited in the slurry, the refractory coating, and the drying process. The wax model is washed and the coating is completed. The wax in the mold is melted. In the present application, the dewaxing process was carried out at a temperature of about 150 ° C. in an autoclave.

In addition, since the mold for precision casting has carbon (C) generated from incomplete combustion of wax remaining in the mold surface or shell pores after dewaxing, it is completely burned and gives strength to the mold. In order to eliminate the influence of the gas, after the wax is charged to the furnace (furnace) by charging the mold, it is calcined in about 30 minutes at a temperature of 1000 ℃.

Melting and casting of the water meter cores are carried out in a vacuum induction furnace. In this application, a master alloy of SUS 304 is placed in a preheated crucible to a vacuum induction furnace and then dissolved. When heating and the alloy starts to melt, pay attention to the melting alloy splashing by tilting the crucible.When the master alloy is ready for tapping, insert the preheated mold into the mold chamber of vacuum induction furnace and inject the molten metal into the mold. The injection should be carefully injected taking into account the fluidity of the melt, and the injection temperature should be approached above the melting temperature of the alloy and the melt should prevent overheating and maintain adequate vacuum during dissolution and injection.

The company has a voice of concern that lead and antimony components, such as brass and bronze faucets and angle valves, may be harmful to humans and may be detected. It is to check the fact that it is detected and to replace it with stainless steel products that are not harmful to the human body, and the process of providing the conventional stainless steel casting process and the high cost of the cost is high. However, especially in the design and manufacture of molds for water supply models such as faucets and angle valves, the wax model is divided into 1/2 and injected into high frequency to develop a new process that integrates them. The invention has been completed, and accordingly the conventional stainless steel round casting process The supply of stainless steel water supplies made of SUS 304 or 316, which was considered inapplicable due to difficulties and high price standards, would have the effect of supplying high-quality tap water to modern people pursuing the well-being era.

Attachment 1: Test report for detection of hazardous substances 1.

Annex 2: Test report for detection of hazardous substances 2.

Attachment 3: Comparison Table of Hazardous Substance Detection.

Claims (7)

In the method of manufacturing water supplies by applying a stainless steel casting process of SUS 304 or 316 material to the vacuum precision casting method, Designing and manufacturing a mold in accordance with a specification desired by the customer for the water supply having an internal core structure to guide and regulate the flow of water; Dividing and ejecting in half to have a core structure inside the wax model; Integrally bonding the divided wax models; Mold preparation and fabrication step, dewaxing and mold firing step; Melting and casting stainless steel alloy made of SUS 304 or 316; Finishing work steps; Stainless steel casting product manufacturing method comprising a. The method of claim 1, A method for manufacturing a water supplies made of stainless steel, characterized in that the step of designing and manufacturing a water supply mold to obtain a divided injection product with a structure in which an inner core is formed on the wax, and to integrally join the divided injection products to obtain a finished wax product. Stainless steel faucet made of SUS 304 or 316 made by the method of claim 1 or 2. Stainless steel angle valve made of SUS 304 or 316 made by the manufacturing method of claim 1 or 2. Stainless steel union made of SUS 304 or 316 made by the method of claim 1 or 2. Stainless steel elbow made of SUS 304 or 316 made by the method of claim 1 or 2. In the method of manufacturing a cast article having a complex core structure therein made of stainless steel cast article made of SUS 304 or 316, Designing and manufacturing a mold to a specification desired by the customer of the casting article having an internal core structure to guide and regulate the flow of the fluid; Split injection in half so that the wax model has an internal core structure; Integrally bonding the divided wax models; Mold preparation and fabrication step; Dewaxing and mold firing steps; Melting and casting of stainless steel alloy; Stainless steel casting product manufacturing method comprising a;

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