KR100683821B1 - Stainless steel water meter - Google Patents

Abstract

The present application is made of brass, which is an alloy containing water (Cu) and zinc (Zn) as main components, or bronze, which is an alloy mainly containing copper (Cu) and tin (Sn). The castings made of these products are made of brass and bronze products. It is confirmed that these brass or bronze castings contain trace amounts of lead and antimony, which are harmful to humans. To provide a stainless steel water meter product.

This company designs and manufactures molds for water meter models, split-injection of wax figures, high-frequency joining steps for integrating wax figures, mold making steps, dewaxing and mold firing to the specifications required by the customer (or designer). Vacuum precision casting, including the steps of melting and casting stainless alloys of SUS 304 or 316 material, finishing work, heat treatment and calibration work, material and component property evaluation, precision machining and tester mounting It relates to a stainless steel water meter made by the method.

Water meter, brass, bronze, stainless steel, split wax mold

Description

Stainless steel water meter made of stainless 304 or 316

1 is a wax product for obtaining a water meter of the present invention 1a is a perspective view of a split wax product, 1b is a top plan view of the wax product, 1c is a side cross-sectional view of the wax product.

Figure 2 is a core manufacturing process diagram of the present invention casting.

Figure 3 is a process diagram of integrating the present invention divided wax model by high frequency welding.

Figure 4 is a perspective view of the water meter of the present invention.

5 is an exploded perspective view of a water meter of the present invention.

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

1: tap water inlet 2: tap water outlet

3: wax base plate 4: intermediate cap support jaw

5: tap water inlet hall 6: tap water outlet hall

10: split wax core 20: stainless steel casting core

21: central axis 22: floor circular plate

30: rotating plate 31: rotating plate center axis

32: hole 33: rotary blade

34: permanent magnet 35: rotating plate center axis

40: middle cap 41: middle cap groove

42: elastic packing material 43: tight spring

50: upper cap 60: measuring device

61: measuring device case 100: stainless steel water meter

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

The present invention relates to a water casting meter made of SS casting and a method of manufacturing the same. More specifically, the precision casting method is used to obtain a water casting meter made of SS casting. A shape injection molding is formed by dividing it into half, and the divided molding is integrated by high frequency welding, and the mold is formed by slurry deposition and refractory coating on the preform, and lost wax, SUS 304 or SUS 316 material Through the process of injecting and cooling the molten alloy to obtain a water meter core made of an alloy made of SS casting, and to provide a water meter made of SS casting by assembling the water meter portion in the middle.

In general, water-related items such as water meters and faucets are daily necessities for supplying tap water that people drink daily. Since the related items must be hygienically managed and must be resistant to corrosion, they are mainly resistant to corrosion. Through the casting process using brass, which is an alloy mainly composed of copper (Cu) and zinc (Zn), or bronze, which is an alloy mainly composed of copper (Cu) and tin (Sn), It has been cast and used.

In other words, if you look at the casting manufacturing process of conventional water-related products, it is necessary to make a mold as a shape that is required to form the middle of the brass water meter by the brass casting fused and mixed with copper (Cu) and zinc (Zn). Since the water meter to be formed has a very rough surface, a process of making a water meter core that is resistant to corrosion by plating and final surface treatment after surface polishing by buffing has been used.

Applicants have long been producing and providing related products, such as brass and bronze water meter meters, and have raised concerns over the possibility that harmful components can be detected from brass or bronze casting alloys. In order to check the element content ratio of the attached materials, three kinds of brass water meter weights made of brass, six kinds of bronze water weight meters made of bronze, and SS castings water weight meter made of SUS 304 were made to the same specifications. In the dissolution test of brass casting (3 types), lead (Pb) component was detected as 0.5 ~ 3.0 ppm, and in the dissolution test of bronze casting (6 types), lead (Pb) component was 4.0 ~. 6.0 ppm and 0.2 ppm antimony (Sb) were detected, and lead (Pb) and antimony (Sb) were not detected in the dissolution test made of stainless steel (SUS 304). As a result, the researches to replace the existing brass and bronze water meter meters with S.S casting materials have been conducted.

Therefore, the present invention was created to eliminate the concern that the above-described conventional brass and bronze water meter cores emit harmful substances, and the present invention provides the SS casting water meter cores of SUS 304 and 316 on an economic scale. It has been studied with the object of the invention to find a casting method that can be.

The company has a voice of concern that lead and antimony components, such as brass and bronze water meter meters, may be harmful to humans, and some products may be detected. The tap water supply line, which should be detected and at least drinkable daily, started with the task of replacing the product with SS castings that are not harmful to the human body, and the conventional SS casting casting process was difficult and the cost of manufacturing cost It has a purpose to provide a manufacturing method that can be applied to this realistically high.

In addition, the SS casting water meter meter of the present invention, as well as the rotating plate material used together is made of engineering plastics with excellent impact resistance and stress, and the intermediate cap and the upper cap is made of stainless steel material to exclude the source of contamination fundamentally It started with the technical problem and purpose to provide SS casting water meter.

In order to achieve the above object, the present application uses a vacuum precision casting method to manufacture a water meter meter with stainless steel alloy of SUS 304 and 316 and a rotating plate, an intermediate cap, an upper cap, a measuring device, etc. It is assembled to provide a water casting meter made of SS castings.

In other words, the present invention is a method for manufacturing a water meter core by using vacuum precision casting method, the design and manufacture of molds for water meter core and faucet mock-up according to the specifications required by the customer, the step of dividing the wax model, injection molding, split manufacturing Integrated waxing, mold making, dewaxing and mold firing, stainless alloy melting and casting of SUS 304 or 316, finishing work, heat treatment and calibration, and material and component evaluation This paper presents a method for manufacturing a water casting meter core made of SS castings, which includes the steps of precision machining and meter reading.

In particular, in the process of manufacturing a water meter core, the method divides the wax into 1/2 to obtain an injection molded product, and integrally joins the divided injection products by using high frequency to obtain a mold, and removes wax and The main purpose of this study is to obtain the middle of the water meter made of SS castings made of SUS 304 and 316 through the casting firing step, melting and casting stainless steel alloy made of SUS 304 or 316.

The process for obtaining the SS meter water meter core of SUS 304, 316 material of the present application includes the steps of the mold design and manufacturing step of wax model and the step of injecting wax model by dividing the wax model into 1/2 as desired by the designer (consumer). Can be subdivided into the steps of deformation correction work of wax model, integrated joining of wax model, mold making step, de-waxing and mold firing step, melting and casting of SS casting alloy of SUS 304 or 316 material, It can consist of finishing work step, heat treatment and deformation correction work step, material and part property evaluation step using destructive and non-destructive method, precision machining and mounting test step.

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. 1A of the present application shows a perspective view of a split wax product obtained as an intermediate product in order to obtain a circular weight of the SS casting water meter in the present invention, 1b shows a top plan view in which a split wax product is combined, and 1c is a side cross-sectional view of 1b. Indicates.

The divided wax product of Figure 1a is divided into two separate wax molds a, b, divided into divided wax 10a, 10b, each of the divided wax inlet (1) and outlet (2), bottom plate (3), meter The support jaw 4 has a structure in which the meter reading unit is rotated via the water inlet 5 and water is discharged through the water outlet 6.

Figure 2 shows a flow chart for obtaining a water meter by the vacuum precision casting method of the present application, according to the requirements and installation specifications of the customer design the mold of the wax model to the desired specifications of the designer (a), according to the design details The wax model is produced, but in the present application, the wax model is divided into 1/2 and injected (b), and the integrated bonding step (c) of the wax model describes the specific high frequency bonding step in FIG. 3, and the slurry deposition step ( d), the refractory coating step (e), the dewaxing step (f), the mold firing step (g), and the melting and casting work step (h) of the SS casting alloy of SUS 304 or 316 material, Finishing work step (i) and the like, and the above processes represent a process that has been used in the past in the vacuum precision casting method, but the features in the present application is the mold design step (a), wax model injection end In the water meter casting process according to the conventional method in the system (b), there was no step (c) of integrally joining the wax figures since the water metering instrument core was integrated into a circle and designed and injected into a single circular wax frame. (a), in the wax model injection step (b), a semi-circular half-shaped split wax mold is formed instead of the circular wax mold, and in the step (c), a new feature of introducing a method of integrating it has a feature, and SS It is intended to produce casting products made in large quantities and to provide casting products with economical efficiency.

Figure 3 shows a process diagram for integrating the divided wax model of the present invention by high frequency welding,
In FIG. 3a, a side view is shown in which a bottom plate 3 of a split wax mold is directed upward as a work process for integrating two divided wax products into one, and the cylinder A is located at the bottom of the split wax molds 10a and 10b. The cylinders B and B 'are connected at both ends of the inlet and outlet of the split wax molds 10a and 10b, and the C cylinder (not shown) supports two wax products which are separately manufactured at the sides of the split wax molds 10a and 10b. It becomes a structure that becomes.

Figure 3b is for showing the operating state of Figure 3a, in order to integrate the two manufactured wax products into one, the cylinder A supports the bottom plate (3) of the divided wax mold 10a, 10b from the lower side, B and B 'cylinders show a structure in which high frequency welding is performed and reversed while simultaneously operating and supporting both ends of the inlet and outlet portions of the divided wax molds 10a and 10b.

In FIG. 3C, in order to integrate the two wax products manufactured separately, C and C 'cylinders support the sides of the divided wax molds 10a and 10b, and the B and B' cylinders obtain the divided wax molds 10a and 10b. At both ends of the part and the outlet part is achieved a structure that is operated and supported simultaneously.

In FIG. 3D, the C and C 'cylinders support the divided wax molds 10a and 10b mold side parts to integrate the two manufactured wax products into one, 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 high frequency welding and reversing is achieved.

Figure 4 shows a perspective view of an embodiment of a water meter made of S.S castings obtained by the practice of the present invention bar 4a is an example of the water meter reading part having an analog meter, 4b shows an example of the water meter reading part has a digital meter.

5 is an exploded perspective view showing the internal structure of the SS casting water meter having an analog meter of Figure 4a bar bottom plate having a central axis 21 above the center of the water casting meter made of SS casting ( 22) is built into the bottom of the water meter core 20, the top of the bottom plate 22 is provided with a rotating plate 30 that rotates according to the flow rate, the rotating plate 30 is the central axis 31 at the bottom It has a built-in hole 32 and has six rotary blades 33 on the side, and has a structure having a central axis 35 to which the permanent magnet 34 is embedded and centered.

The upper part of the rotating plate 30 is a structure in which the intermediate cap 40 having a watertight structure is stacked, and a groove 41 is formed in the side middle portion of the intermediate cap 40 so that the elastic packing material is interposed therein, and the groove 41 is outside the groove 41. The elastic packing material 42 is interpolated to form a watertight structure on the inner surface of the water meter core 20, and the upper steel cap spring 43 is embedded in the upper portion of the intermediate cap 40 to fix the intermediate cap 40. In the upper portion of the intermediate cap 40, the rotary blade 33 of the rotating plate 30 is rotated according to the water usage, and at the same time, the gear of the measuring device 60 is rotated in response to the rotational speed of the permanent magnet 34. By using the upper cap 50 in the upper portion of the middle cap 40, the case 61 made of a measuring device 60 and the transparent resin protecting the measuring device 60 to calculate the amount of water used by analog or digital values By tightening the rotating plate 30, the intermediate cap 40, the upper cap 50, the measuring device 60 to the water meter core 20 An exploded perspective view showing that the water meter 100 made of S.S casting can be combined with a sieve.

Various factors may be considered to perform the above casting process, but the technical idea of the present invention is to know the result of detecting lead and antimony components harmful to human body in conventional brass and bronze water meter meters, which are manufactured by SS casting products. In the case of applying the SS casting casting process to the conventional brass and bronze casting process, it is difficult to apply and the manufacturing cost of the manufacturing cost is high. In the process of designing and manufacturing molds for water meter cores, the precision casting method is used to solve the difficulty of the round casting process of SS castings by developing a process of dividing and molding wax models into 1/2 and integrating them by high frequency bonding. SUS 3, which was recognized as not applicable due to the high price standard of castings made of SS castings It is a technical idea of the present invention to provide SS castings made of 04 or 316 material, and it will be difficult for those skilled in the art to construct a casting by the technical idea alone, but look at other technical elements for precision casting. As follows.

In the precision casting, a mold for making wax models is produced. 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. The mold design is the product drawing and the water meter. The mold dimensions are corrected to account for the shrinkage rate that matches the material properties of the 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 low heat deformation and smooth processing, and in this application, in consideration of the above conditions, aluminum 7075-T6 was used as a material used for manufacturing a wax model. .

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

In this application, Crytobal Light Binder Ethylsilicate is used as an investment aggregate as a material used for making a mold. In addition, in order to use the refractory as a template aggregate, the refractory should have an appropriate particle size distribution. Of course, since it is directly related to the strength of the mold and the air permeability, it is necessary to select a refractory material having an appropriate particle size distribution. In order to satisfy the above conditions, Zircon 325-400 mesh was used.

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 is carried out in a vacuum induction furnace, in which the master alloy of SUS 304 is placed in a preheated crucible to the vacuum induction furnace and then dissolved. When heating and the alloy starts to melt, pay attention to the splashing of the molten alloy by tilting the crucible.When the mother alloy is ready for tapping, charge 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.

This company has voiced concern that related products such as brass and bronze water meter meters and faucets, such as conventional brass and bronze, may detect harmful substances such as lead and antimony, which may cause fatal harm to humans. This is to check the facts and to replace with stainless steel products that are not harmful to the human body, and the process of applying the conventional stainless steel casting process and the high cost of the cost, while finding a way to apply them realistically, the conventional vacuum precision casting method In particular, in the step of designing and manufacturing molds for water meter middle and faucet models, it is possible to develop a new production system by developing a new process of dividing and injecting wax models into 1/2 and integrating them by high frequency bonding. Therefore, the original SS casting prototype It is possible to provide SS castings made of SUS 304 or 316 material, which was recognized as inapplicable due to the difficulty of water process and the high price standard, and the rotating meter, middle cap, upper cap, measuring device in the middle of the water meter It is possible to provide SS casting water meter with structure that is integrally combined, and modern people pursuing well-being era by providing not only the meter but also SS casting union, SS casting faucet, SS casting angle valve, etc. It could have the effect of supplying quality tap water.

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 (2)

In the method of manufacturing a water meter weight meter made of stainless steel casting by using a vacuum precision casting method, In the stage of designing and manufacturing the mold for water metering instrument core according to the requirements of the customer, the injection product is obtained by dividing the wax product, and the wax injection product is divided into 1/2 of tap water inlet, outlet hole, bottom plate, and intermediate support Obtaining an injection molded product; Integrally joining the injection-molded products having a structure divided into half by symmetrical structure to each other into a circular wax product; Manufacturing a mold using the circular wax product; Dewaxing and mold firing steps; Melting and casting stainless steel alloys made of SUS 304 or 316; Finishing work steps; Method for producing a water meter weigher core, characterized in that to obtain a water meter meter made of stainless steel casting through a process comprising a. In the water meter coupling structure provided as a water meter weight meter made of stainless steel casting, A bottom circular plate (22) having a central axis (21) above the water meter core (20) obtained by the manufacturing method of claim 1 is embedded in the bottom of the water meter core (20), and at the flow rate above the bottom plate (22). Rotating plate 30 is installed to rotate along, the structure of the rotating plate 30 has a hole 32 in which the central axis 31 is built in the lower side and six rotating blades 33 in the side and permanently in the upper portion The magnet 34 is built and forms a structure having a central axis 35, and the upper portion of the rotary plate 30 has an intermediate cap 40 having a watertight structure, but elastic packing on the side portion of the intermediate cap 40 The groove 41 is made to insert the ash and the elastic packing material 42 is inserted outside the groove 41 to form a watertight structure on the inner surface of the water meter core 20, and the upper portion of the intermediate cap 40 is made of steel. The first tight spring 43 is built to form a structure for fixing the intermediate cap 40, the upper portion of the intermediate cap 40 to protect the measuring device 60 and this By fastening the case 61 made of transparent resin using the upper cap 50, the rotating plate 30, the intermediate cap 40, the upper cap 50, and the measuring device 60 are integrally connected to the water meter core 20. Stainless steel water meter, characterized in that coupled to.

Images