WO2020024084A1

WO2020024084A1 - Copper alloy valve processing technology

Info

Publication number: WO2020024084A1
Application number: PCT/CN2018/097695
Authority: WO
Inventors: 周天毫
Original assignee: 苏州速腾电子科技有限公司
Priority date: 2018-07-28
Filing date: 2018-07-28
Publication date: 2020-02-06

Abstract

A copper alloy valve processing technology Said processing technology comprises the following steps: (1) manufacturing a mold; (2) shaping with molding sand; (3) smelting; (4) pouring; (5) cooling; and (6) surface treatment: cleaning the surface of the valve, cutting out pouring gates and feeder heads, relief grinding protrusions such as burrs and fins, cleaning residual sand, and spraying a protective agent on the surface of the valve, so as to obtain a copper alloy valve. According to said processing technology, heat-resistant molding sand is used, so that the produced valve has a small error in wall thickness, small surface blowholes, and few internal gas pores and shrinkage cavities, and the yield of the valve is high; staged cooling is used, which helps to improve the ductility of the alloy while improving the strength of the alloy; a protective agent is sprayed on the surface of the valve after casting is finished, reducing corrosion on the valve, prolonging the service life of the valve.

Description

Processing technology of copper alloy valve

Technical field

The invention relates to a processing technology of a copper alloy valve, and belongs to the technical field of valve processing.

Background technique

The valve is a control component in the fluid delivery system, and has functions such as cut-off, regulation, diversion, prevention of backflow, voltage stabilization, shunting, or pressure relief. Valves are divided into cast iron valves, cast steel valves, stainless steel valves, chrome-molybdenum steel valves, chrome-molybdenum-vanadium steel valves, dual-phase steel valves, plastic valves, and non-standard valve materials. At present, in the steel casting industry, when casting steel parts, casting molds, casting and post-processing of valves are usually performed. Improper processing of the cast steel is prone to defects such as cracks, trachoma and pores, which affect the quality of the product. The reasonable production process has become a technical problem to be solved urgently by those skilled in the art.

At present, most of the anti-corrosion and anti-fouling alloy materials are copper. Chinese patent (CN 105779814A) discloses an alloy material, and the anti-corrosion and anti-scaling performance of the alloy material is increased by adding a rare earth element to the alloy material. The anti-corrosion and anti-scale alloy materials have the advantages of non-magnetic, no electricity, no energy consumption, etc., but the existing anti-corrosion and anti-scale alloy materials still need to improve their anti-corrosion and anti-scale performance.

Summary of the invention

In order to overcome the shortcomings of the prior art, the present invention provides a processing technique for a copper alloy valve.

The present invention is achieved through the following technical solutions:

A processing technology of a copper alloy valve includes the following steps:

(1) Make a mold: Make a mold according to the shape of the valve, and a riser and a gate are set on the mold;

(2) Molding sand molding: Use heat-resistant molding sand to make sand molds around the mold, take out the mold to obtain sand molds, and heat the molds to 200-250 ° C for later use;

(3) Smelting: Put the raw materials in a three-phase electric arc furnace, raise the temperature to 1200-1350 ° C, transfer to a decarburization furnace, pass in oxygen, and add an inoculant to obtain an alloy melt; the raw materials are: copper 30 -35%, zinc 2-5%, nickel 3-4%, tin 2-3%, neodymium 1-2%, lanthanum 1-2%, aluminum 0.2-0.5%, silicon 0.2-0.4%, carbon 0.1-0.2 %, The rest are unavoidable impurities and iron;

(4) pouring: pouring the molten alloy into the sand mold, the pouring temperature is 1300-1400 ℃;

(5) Cooling: rapid cooling to 800-900 ° C, holding temperature for 10-20min; rapid cooling to 350-400 ° C, holding temperature for 20-30min; then leave to cool to room temperature;

(6) Surface treatment: clean the valve surface, cut off the protrusions such as the gate, riser, burr and burr, and clean the residual sand again. Spray the protective agent on the surface of the valve to obtain the copper alloy valve.

In the processing technology of a copper alloy valve, the heat-resistant molding sand includes the following raw materials in parts by weight: 80-90 parts of zircon sand, 10-20 parts of quartz sand, 10-13 parts of furan resin, and ammonium chloride 1-3 parts, water glass 2-3 parts and clay 5-9 parts.

In the processing technology of a copper alloy valve, the inoculant includes the following raw materials in parts by weight: 2-5 parts of nano-silica, 20-30 parts of aluminum, 10-15 parts of tin, and 10-15 parts of nickel And 10-15 parts of barium.

In the processing technology of a copper alloy valve, the inoculant is obtained by the following steps: aluminum, tin, nickel, and barium are placed in an electric furnace in accordance with the proportion to be smelted, and the smelted alloy is made into particles, and The granular alloy is placed in a ball mill and nano-silica dry ball milling is added to obtain an inoculant.

In the processing technology of a copper alloy valve, the protective agent includes the following raw materials in parts by weight: 30-40 parts of epoxy resin, 4-9 parts of dimethyl silicone oil, 20-30 parts of polyethylene glycol, 1-5 parts of chitosan, 10-15 parts of polydimethylsiloxane and 3-8 parts of sodium stearate.

In the processing technology of a copper alloy valve, the protective agent is obtained by the following steps: under stirring conditions, epoxy resin, chitosan, and polydimethylsiloxane are sequentially added to polyethylene glycol. Alkane; after stirring for 30-40min, then add dimethyl silicone oil and sodium stearate in sequence, and stir for 20-30min to obtain the protective agent.

Beneficial effects achieved by the present invention:

First, the processing technology of the present invention uses heat-resistant molding sand, so that the produced valve has a small wall thickness error, small surface trachomas, fewer internal pores and shrinkage holes, and a high valve yield.

Secondly, the addition of rare earth elements in the alloy raw materials increases the hardenability of the alloy, significantly improves the strength, hardness and wear resistance, and also increases the corrosion resistance and oxidation resistance of the alloy; meanwhile, it uses decarburization and inoculant technology, Make the alloy grains uniform and reduce casting defects;

Secondly, the use of segmented cooling will help improve the ductility of the alloy and increase the strength of the alloy;

Finally, spray the protective agent on the surface of the valve after casting to reduce the corrosion of the valve and prolong the service life of the valve.

The molding sand raw material adopted by the invention is simple, the raw material cost is low, the heat resistance is good, and the produced casting is easy to peel off and the surface is smooth.

The inoculant used in the invention has simple components. By adding nano-silica, the matrix structure of the alloy melt can be refined and the grains can be refined, thereby improving the hardness of the valve, reducing the occurrence of pores, and reducing the different thicknesses of the valve. There is a difference in hardness; the manufacturing method is simple, and nano-silica, aluminum, tin, nickel, and barium can be thoroughly mixed by ball milling.

The protective agent material of the invention is environmentally friendly and has a simple manufacturing method, which can quickly form a protective film on the surface of the valve, thereby prolonging the service life of the valve.

detailed description

The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

Example 1

A processing technology of a copper alloy valve includes the following steps:

(3) Smelting: Put the raw materials in a three-phase electric arc furnace, raise the temperature to 1200-1350 ° C, transfer to a decarburization furnace, pass in oxygen, and add an inoculant to obtain an alloy melt; the raw materials are: copper 30 -35%, zinc 2-5%, nickel 3-4%, tin 2-3%, neodymium 1-2%, lanthanum 1-2%, aluminum 0.2-0.5%, silicon 0.2-0.4%, carbon 0.1-0.2 %, The rest are unavoidable impurities and iron; the amount of inoculant added is 0.02%;

The heat-resistant molding sand includes the following raw materials in parts by weight: 90 parts of zircon sand, 10 parts of quartz sand, 13 parts of furan resin, 1 part of ammonium chloride, 2 parts of water glass, and 5 parts of clay.

The inoculant includes the following raw materials in parts by weight: 2 parts of nano-silica, 20 parts of aluminum, 10 parts of tin, 10 parts of nickel, and 10 parts of barium.

The inoculant is obtained by the following steps: aluminum, tin, nickel, and barium are placed in an electric furnace in accordance with the ratio to be smelted, the smelted alloy is made into particles, and the granular alloy is placed in a ball mill to add nano dioxide The inoculant was obtained after silicon dry ball milling.

The protective agent includes the following raw materials in parts by weight: 40 parts of epoxy resin, 4 parts of dimethyl silicone oil, 30 parts of polyethylene glycol, 1 part of chitosan, 10 parts of polydimethylsiloxane, and stearin 3 servings of sodium.

The protective agent is obtained by the following steps: under stirring conditions, epoxy resin, chitosan, and polydimethylsiloxane are sequentially added to the polyethylene glycol; after stirring for 30-40 minutes, two Methyl silicone oil and sodium stearate can be obtained by stirring for 20-30min.

Example 2

A processing technology of a copper alloy valve includes the following steps:

The heat-resistant molding sand includes the following raw materials in parts by weight: 80 parts of zircon sand, 20 parts of quartz sand, 10 parts of furan resin, 3 parts of ammonium chloride, 3 parts of water glass, and 9 parts of clay.

The inoculant includes the following raw materials in parts by weight: 5 parts of nano-silica, 30 parts of aluminum, 15 parts of tin, 15 parts of nickel, and 15 parts of barium.

The protective agent includes the following raw materials in parts by weight: 30 parts of epoxy resin, 9 parts of dimethyl silicone oil, 20 parts of polyethylene glycol, 5 parts of chitosan, 15 parts of polydimethylsiloxane, and stearin 8 parts of sodium.

Example 3

A processing technology of a copper alloy valve includes the following steps:

The heat-resistant sand comprises the following raw materials in parts by weight: 88 parts of zircon sand, 12 parts of quartz sand, 12 parts of furan resin, 2 parts of ammonium chloride, 3 parts of water glass, and 6 parts of clay.

The inoculant includes the following raw materials in parts by weight: 3 parts of nano-silica, 24 parts of aluminum, 12 parts of tin, 12 parts of nickel, and 12 parts of barium.

The protective agent includes the following raw materials in parts by weight: 36 parts of epoxy resin, 6 parts of dimethyl silicone oil, 25 parts of polyethylene glycol, 3 parts of chitosan, 14 parts of polydimethylsiloxane, and stearin 5 parts of sodium.

The above is only a preferred embodiment of the present invention. It should be noted that, for those of ordinary skill in the art, without departing from the technical principles of the present invention, several improvements and deformations can be made. These improvements and deformations It should also be regarded as the protection scope of the present invention.

Claims

A processing technology of a copper alloy valve is characterized in that it includes the following steps:

(1) Make a mold: Make a mold according to the shape of the valve, and a riser and a gate are set on the mold;

(2) Molding sand molding: Use heat-resistant molding sand to make sand molds around the mold, take out the mold to obtain sand molds, and heat the molds to 200-250 ° C for later use;

(3) Smelting: Put the raw materials in a three-phase electric arc furnace, raise the temperature to 1200-1350 ° C, transfer to a decarburization furnace, pass in oxygen, and add an inoculant to obtain an alloy melt; the raw materials are: copper 30 -35%, zinc 2-5%, nickel 3-4%, tin 2-3%, neodymium 1-2%, lanthanum 1-2%, aluminum 0.2-0.5%, silicon 0.2-0.4%, carbon 0.1-0.2 %, The rest are unavoidable impurities and iron;

(4) pouring: pouring the molten alloy into the sand mold, the pouring temperature is 1300-1400 ℃;

(5) Cooling: rapid cooling to 800-900 ° C, holding temperature for 10-20min; rapid cooling to 350-400 ° C, holding temperature for 20-30min; then leave to cool to room temperature;

(6) Surface treatment: clean the valve surface, cut off the protrusions such as the gate, riser, burr and burr, and clean the residual sand again. Spray the protective agent on the surface of the valve to obtain the copper alloy valve.
The process for processing a copper alloy valve according to claim 1, wherein the heat-resistant molding sand comprises the following raw materials in parts by weight: 80-90 parts of zircon sand, 10-20 parts of quartz sand, and furan resin 10-13 parts, 1-3 parts ammonium chloride, 2-3 parts water glass and 5-9 parts clay.
The processing technology of a copper alloy valve according to claim 1, wherein the inoculant comprises the following raw materials in parts by weight: 2-5 parts of nano-silica, 20-30 parts of aluminum, and 10- 15 parts, nickel 10-15 parts and barium 10-15 parts.
The processing technology of a copper alloy valve according to claim 3, wherein the inoculant is obtained by the following steps: aluminum, tin, nickel, and barium are placed in an electric furnace in accordance with the ratio for smelting, and after smelting The alloy is made into granules. The granulated alloy is placed in a ball mill and the nanosilica dry ball milling is added to obtain the inoculant.
The processing technology of a copper alloy valve according to claim 1, wherein the protective agent comprises the following raw materials in parts by weight: 30-40 parts of epoxy resin, 4-9 parts of dimethyl silicone oil, and 20-30 parts of ethylene glycol, 1-5 parts of chitosan, 10-15 parts of polydimethylsiloxane and 3-8 parts of sodium stearate.
The process for processing a copper alloy valve according to claim 5, wherein the protective agent is obtained by the following steps: under stirring conditions, epoxy resin and shell polymer are sequentially added to the polyethylene glycol. Sugar and polydimethylsiloxane; after stirring for 30-40 minutes, then add dimethyl silicone oil and sodium stearate in order, and stir for 20-30 minutes to obtain a protective agent.