KR101103383B1 - Product method of pipe connect component - Google Patents

Abstract

PURPOSE: A manufacturing method for a pipe connecting member is provided to prevent water leakage at the junction between a pipe connecting member and a pipe and ensure convenient installation of a pipe connecting member. CONSTITUTION: A manufacturing method for a pipe connecting member is as follows. A shell mold is casted by injecting a shell material, which comprises phenol resin of 5~20 weight% and aromatic condensed polyphosphate ester or 80~95 weight%, in a heated mold. The shell mold is assembled and molten metal is put into the mold to produce a casted product. The casted product is heated at 700~800°C and naturally cooled. A connecting gate left in the casted product is cut out and the cut surface is finished. The casted product is polished, and scrap removal and surface treatment are implemented. Threads are cut in the casted product using a CNC machine. The casted product is subject to bubbling and internal water pressure inspection, gauge inspection, and pneumatic inspection. Accessories, including a grab ring, a washer, an O-ring, and a cap, are assembled to the casted product.

Description

Production method for pipe joints {PRODUCT METHOD OF PIPE CONNECT COMPONENT}

The present invention relates to a pipe joint member manufacturing method, and more particularly to a manufacturing method of stainless steel sockets, elbows and the like used to connect the pipe.

In general, the pipe joint member used for water pipes is brass or bronze, and it is plated with tin alloy to improve the texture, which is described as a prior art in Patent Registration 10-0379319, and the conventional technology is a faucet. The surface of the faucet is plated with an alloy containing tin as its main component, and the faucet and its surface treatment method to provide a more luxurious aesthetic by providing a texture of stainless steel, and for this purpose, a grain is formed in a predetermined direction by scratching. Faucets with a surface-treated faucet made of tin (Sn) as the main component and the surface treatment of such faucets and the surface treatment of such faucets include a process of plating nickel (Ni) after buffing the cast-molded surface, and Brush-polished the (Ni) plated surface with a flap brush. Process, degreasing the scratched surface by cathodic electrolysis, dipping with a neutralizing solution, plating an alloy containing tin (Sn) as a main component, and oxidizing the plating surface with an oxidizing solution It is to be performed by the process of forming a film, and the process of washing with water.

     On the other hand, such a brass or bronze material is toxic, and improved to this, and Patent Publication No. 2004-99729 has a process of manufacturing a mold as a prior art; 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; The surface of the inside of the faucet, which is a passage through which tap water flows, is also performed by washing the molded product having the phosphate coating with water to remove the phosphate component from the surface. Techniques for removing lead by causing treatment have been described.

     And for the human toxic substances contained in the pipe member as described in Patent 10-0976741 Bronze casting (JIS H5120 CAC406) as a bronze-based low smoke alloy technology, is usually excellent in castability, corrosion resistance, machinability, pressure resistance, It is also widely used for water supply and hot water supply such as valves, cocks, and joints, and piping materials for steam. This bronze casting (CAC406) contains several% of Pb (lead), and in particular, contributes to the improvement of machinability and pressure resistance. However, at present, even if Pb at low concentrations adversely affects the human body, in order to prevent Pb leaching into tap water, and to prevent soil contamination, Pb-containing wastes are regulated, as well as Pb-containing restrictions in used materials. It is strictly regulated in each direction. Based on such a situation, the development of a new useful lead-free copper alloy has become an urgent task, and among them, it is described that various materials such as Bi-based, Bi-Sb-based, and Bi-Se-based have been developed.

     Therefore, stainless steel pipes and seams are used as alternative materials, and as a prior art, the registration number 10-0999881 shows that a stainless steel pipe for water supply on one side has a socket portion at one end of a pipe body having an inlet and an outlet of a fluid. Or as a stainless steel pipe to form at least one of the tube inserting portion, there is described a stainless steel pipe for water supply in which a synthetic resin coating layer is formed on the outer surface of the stainless steel pipe.

     In other words, pipe fittings generally used for water pipes, such as brass, bronze, but it is toxic and harmful to the human body, has excellent corrosion resistance and is being changed to a stainless material harmless to the human body.

     However, the above stainless steel pipe fittings are mainly manufactured through casting, which makes the mold difficult, complicated manufacturing process, and the quality of the pipe fittings is not guaranteed. There was a disadvantage of this inconvenience.

     In addition, when the stainless steel pipe fitting member is connected to a synthetic resin pipe such as PB, there is no suitable accessory assembly on the pipe fitting member, which makes work in the field inconvenient and slow, and also facilitates leakage of the joint portion between the pipe and the fitting member. There was a downside.

Therefore, the present invention has been devised to solve the above problems, the present invention is easy and simple to manufacture a stainless steel socket or elbow which is a pipe joint member, the manufactured socket or elbow is sure airtight when combined with the pipe It is to provide a pipe joint member manufacturing method that is easy to install and no leakage.

The present invention relates to a pipe joint member manufacturing method, in the socket or elbow manufacturing method of the pipe joint member, the socket or elbow is made of stainless steel, cell mold manufacturing process, cell manufacturing process, casting process, cutting process, machining process And it relates to a pipe joint member manufacturing method comprising an assembly process.

Therefore, the present invention easily and simply manufactures a socket or elbow, which is a stainless steel pipe fitting member, and has a remarkable effect that the manufactured socket or elbow is leak-tight and convenient to install when combined with the pipe.

1 is a manufacturing process diagram of the present invention pipe joint member
2 is an assembly view of the present invention pipe joint member
Figure 3 is a picture of the present invention pipe fitting member mold
4 is a detailed picture of FIG.
5 is a cross-sectional view of the present invention grabbing production mold
6 is a perspective view of the present invention grabbing
7 is a plan view of the present invention grabbing
8 is a side view of the present invention grabbing

The present invention relates to a pipe joint member manufacturing method, in the pipe joint member manufacturing method, the pipe joint member is made of stainless steel, the cell mold manufacturing process, cell manufacturing process, casting process, cutting process, machining process and assembly process It is characterized by including.

     In addition, the cell fabrication process is a process of making a mold by injecting a cell material into the heated mold, the cell material is characterized in that it comprises a phenol resin as a caking additive, and an aromatic condensed phosphate ester as a molding sand.

     In addition, the pipe fitting member is characterized in that the socket, elbow or tee.

     The present invention will be described in detail with reference to the accompanying drawings. 1 is a manufacturing process diagram of the present invention pipe joint member, Figure 2 is an assembly view of the pipe joint member of the present invention, Figure 3 is a mold photograph of the pipe joint member of the present invention, Figure 4 is a detailed photo of Figure 3, Figure 5 is a grasp of the present invention Manufacturing mold cross section, FIG. 6 is a perspective view of the present invention grabbing, FIG. 7 is a plan view of the present invention grabbing, and FIG. 8 is a side view of the present invention grabbing.

     The cell mold manufacturing process is a casting process, in order to produce large quantities of products of the same standard, cell molds, which are molds for pouring casting, are required. Thus, cell mold molds for manufacturing a large number of cell molds are manufactured.

     The manufacturing method is to manufacture the cell mold mold through the process of design, mold making, sand casting, heat treatment, MCT processing, and thought. Is omitted.

     And mold casting material uses gray cast iron FC25.

     The cell manufacturing process is a process of making molds by pouring thermosetting synthetic resin into a heated mold to form molds for casting castings.

Cell manufacturing method goes through the process of mold installation, mold heating, injection molding, mold heating, and cell completion.

     The cell material includes a phenol resin as a binder and a condensate phosphoric acid as an aromatic casting sand. In particular, the phenolic resin used as the caking additive of the cell has the advantage that the amount of soot generated is small, and after being poured into the formwork, the disintegration property is good. 5-20 weight% of phenol resins are added, and 80-95 weight% of condensed phosphate esters are added to a raw material mix ratio of a cell. If the phenolic resin is less than 5% by weight, the cell is likely to break during the manufacturing process, and if it is more than 20% by weight, the strength of the cell is withdrawn. Similarly, when the content of the condensed phosphate ester, which is the foundry sand, is less than 80% by weight, the strength of the cell is weakened. When the content of the condensed phosphate ester is less than 80% by weight, the strength is strong, but the moldability of the cell is poor, and it is easy to be defective.

In the cell manufacturing process, after the mold is installed in the core machine, the cell is heated for 1 hour, and then the cell is continuously produced at intervals of 1 to 2 minutes.

     The casting process is a process of assembling a die-molded mold and pouring molten metal to produce casting products.

     The molten casting material injected from the melting furnace is about 1,580 ° C, and the material component of the casting material is SUS (STS) 304.

     The heat treatment process is to heat the made pipe joint member at 700 ~ 800 ℃ for about 10 hours, then natural cooling for 3 to 5 hours.

The cutting process is the process of cutting the connecting gate attached to the product and finishing the surface roughness after the casting process. The cutting method removes the connecting gate with a grinder.

Polishing and short process is to polish the product with a polishing machine, and the short process is to remove foreign matter and surface treatment of the cut and polished product. Work method is to put the product and 0.4 ~ 1.2mm short ball into SHOT BLAST M / C and rotate it strongly to surface treatment.

Machining process is the process of shaving the thread of casting product. The working method is the process of cutting the thread automatically using the dedicated TIP after casting the casting product to the CNC machine. Depending on the type of product shape, there may be one thread or two or more threads.

The inspection (pneumatic) process is a process to check the presence of bubbles and the water pressure test according to the characteristics of the casting shape. The working method is a visual inspection that determines whether there is a bubble by visually inspecting all the products, a gauge inspection that determines whether the thread of the product is defective with a dedicated gauge, and a pneumatic inspection that determines whether the product is defective by flowing water at 0 ~ 5MPa pressure to the product. The process takes place.

     The assembly process is the process of assembling grab rings, washers, o-rings and caps as accessories in the product.

     The assembly order is as follows: product-grab ring-washer-o-ring-cap. The cap is used to insert a pipe made of PB (polybutylene) by fixing the grab ring, washer and O-ring. The cap is manufactured by injection method, and the material is made of nylon, parque (dust or stone). The component ratio is 70% by weight of nylon, 30% by weight of parquet. The stainless steel sleeve can be inserted into the pipe.

     The O-ring is a seal (sealing) pipe, and the material uses EPM. The washer is installed between the grab ring and the o-ring to prevent the o-ring from tearing and to fix the grab ring. O-ring material uses acetal.

     Grabing is to fix the pipe and prevent the pipe separation, the hole drilling the iron plate coil material by the press, the hole periphery of the perforated gear shape to form a plurality of engaging pieces around the hole hole drilling process; A bending step of bending the hole in the shape of a bowl by pressing the punched coil material; By cutting the bent coil material is prepared by the step of producing a grabbing, the material is used SUS316.

     Therefore, the present invention can easily and simply manufacture a stainless steel pipe fitting member socket or elbow, and the manufactured socket or elbow is sure of airtight when combined with the pipe, it is easy to install leaks.

10: pipe joint member 20: grab ring
30: O-ring 40: Washer
50: cap 60: sleeve
70: piping

Claims (3)

In the method of manufacturing a socket joint, elbow or tee as a pipe joint member, the socket, elbow or tee as a pipe joint member is made of stainless steel, and a cell mold manufacturing process, a cell manufacturing process, a casting process, a heat treatment process, a cutting process, a polishing and a shorting are performed. To be manufactured including the process, processing process, inspection process and assembly process,
The cell fabrication process is a process of making a mold by injecting a cell material into a heated mold, the cell material comprises a phenol resin as a caking additive and an aromatic condensed phosphate ester as a molding sand, the raw material blending ratio is 5 ~ 20 Addition by weight, 80-95% by weight of condensed phosphate ester,
The casting process is a process of producing a casting product by pouring a molten metal by assembling a mold of a mold, the material component of the casting material using SUS (STS) 304,
The heat treatment step is to heat the made pipe joint member at 700 ~ 800 ℃, then natural cooling,
The cutting process is the process of cutting the connecting gate attached to the product and finishing the surface roughness after the casting process.
Polishing and shortening process is to process the product by polishing machine, remove foreign substances and surface treatment of the cut and polished product.
Machining process is the process of cutting thread on CNC machine to casting product.
The inspection process is a process of visual inspection, gauge inspection, and pneumatic inspection for the presence of bubbles and water pressure inspection according to the casting shape.
The assembling process is a process of assembling grab rings, washers, o-rings and caps as accessories to the socket, elbow or tee, which are the pipe joint members manufactured by the above assembly processes, and the assembly sequence is the pipe joint member, grab ring, washer, O-ring, Assembling in the order of the cap, the grabbing is to fix the pipe and prevent the pipe separation, to drill a hole in the iron sheet coil material by a press, the periphery of the hole in the shape of a gear to form a plurality of engaging pieces around the hole A hole drilling step; A bending step of bending the hole in the shape of a bowl by pressing the punched coil material; Manufacturing the grabbing by cutting the bent coil material; delete delete

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