CN104084524B - A kind of casting technique of carbon steel valve - Google Patents

A kind of casting technique of carbon steel valve Download PDF

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Publication number
CN104084524B
CN104084524B CN201410261169.2A CN201410261169A CN104084524B CN 104084524 B CN104084524 B CN 104084524B CN 201410261169 A CN201410261169 A CN 201410261169A CN 104084524 B CN104084524 B CN 104084524B
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China
Prior art keywords
valve
sand
wooden
carbon steel
casting technique
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CN201410261169.2A
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Chinese (zh)
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CN104084524A (en
Inventor
浦巧生
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吴江市液铸液压件铸造有限公司
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Abstract

The invention discloses the casting technique of a kind of carbon steel valve.Technique includes following step: (1) makes wooden model according to the shape of valve, and wooden model is provided with rising head and cast gate;(2) around wooden model, make sand mold with molding sand, take out wooden model, in sand mold, be coated with one layer of high-temperature resistant coating;(3) steel scrap is placed in three-phawse arc furnace, heats up, proceed to decarbonizing furnace, after adding Calx, pass into oxygen, add aluminum and ferromanganese after dephosphorization and desulfurization, obtain molten steel;(4) pour steel;(5), after cooling, clear up valve surface, clear up residual sand, carbon steel valve can be obtained.Preparation method of the present invention is simple, and pouring temperature is reasonable, and the valve scab, the knockout phenomenon that prepare significantly reduce, and eliminate the defects such as valve crackle and pore, improve the hardness of valve, wear-resisting and good seal performance, extend the service life of valve.

Description

A kind of casting technique of carbon steel valve
Technical field
The present invention relates to the casting technique of a kind of carbon steel valve, belong to foundary industry technical field.
Background technology
Valve is the control parts in fluid delivery system, has cut-off, adjustment, water conservancy diversion, prevents the functions such as adverse current, voltage stabilizing, shunting or overflow pressure relief.Valve is divided into cast iron valve, cast steel valve, stainless valve, chrome-molybdenum steel valve, Chrominm-molybdenum-vanadium steel valve, dual phase steel valve, Plastic valve, nonstandard customized valve material such as grade according to material.
At present in cast steel industry, steel-casting is when casting, generally to manufacture mould, the later stage carrying out valve again of casting processes, deal with improperly, the defect such as the steel-casting obtained easily cracks, sand holes, pore, have impact on product quality, process for subsequent technique and cause very big difficulty, add production cost.Molding sand effect in Foundry Production is particularly important, and the casting wasted product caused because of the poor quality of molding sand accounts for the 30~50% of the total waste product of foundry goods.Application number is the casting method that 201210186985.2 " casting methods of a kind of butterfly valve core " disclose a kind of butterfly valve core, and the method composition of raw materials is reasonable, and technique is simple, but due in potting syrup phosphorus content higher, it is easy to cause that shrinkage cavity occurs in foundry goods.
Summary of the invention
It is an object of the invention to provide the casting technique of a kind of carbon steel valve.
The present invention is achieved through the following technical solutions:
A kind of casting technique of carbon steel valve, including following step:
(1) mould is made: make wooden model according to the shape of carbon steel valve, wooden model is provided with rising head and cast gate;
(2) sand molding: make sand mold with molding sand around wooden model, take out wooden model, is coated with one layer of high-temperature resistant coating in sand mold;Described molding sand is in parts by weight, including waterglass 2-3 part, quartz sand 80-90 part, ethylene diacetate 11-18 part and clay 5-9 part, described high-temperature resistant coating is in parts by weight, including Borax 20-30 part, quartz sand 20-30 part, coke 15-30 part, silane coupler 3-6 part, polyethylene 10-16 part and water 50-70 part;
(3) melting molten steel: be placed in three-phawse arc furnace by steel scrap, be warming up to 1600-1620 DEG C, proceeds to decarbonizing furnace, after adding Calx, passes into oxygen, adds aluminum and ferromanganese, obtain molten steel after dephosphorization and desulfurization;
(4) cast: pour steel in sand mold, pouring temperature is 1580-1600 DEG C;
(5) cooling: after natural cooling, clears up the ridges such as valve surface, excision cast gate, rising head, relief grinding burr and fash, again clears up residual sand, can obtain carbon steel valve.
Described molding sand is through the following steps that obtain: quartz sand is crossed 200 mesh sieves, is then sufficiently mixed with waterglass, ethylene diacetate and clay, then sinter 2h under 1200 DEG C of conditions, obtain molding sand through broken and screening after cooling.
Described high-temperature resistant coating through the following steps that obtain: quartz sand and coke are reacted 2h under 1500-2000 DEG C of condition, it is cooled to 600-800 DEG C, add Borax, reaction 1h, after being cooled to room temperature, mixing with silane coupler, polyethylene and water for ball milling, stand, the water pumping upper strata obtains high-temperature resistant coating.
The casting technique of described carbon steel valve, modulus of water glass is 1.5.
The casting technique of described carbon steel valve, in described molten steel, phosphorus content is 0.2-0.5%, and phosphorus content is less than 0.01%.
According to the carbon steel valve that described casting technique obtains.
The beneficial effect that the present invention reaches:
The present invention is after taking out wooden model, being coated with one layer of high-temperature resistant coating in sand mold, high-temperature resistant coating improves the high-temperature resistant result of molding sand, makes molding sand under the pouring temperature of 1580-1600 DEG C, it is not easy to produce to expand, it is possible to reduce gas source, raising fluidity molten steel and mould strength;Adopting rising head to prevent shrinkage cavity phenomenon, by dephosphorization step, in molten steel, phosphorus content is low.
Preparation method of the present invention is simple, and pouring temperature is reasonable, and the valve scab, the knockout phenomenon that prepare significantly reduce, and eliminate the defects such as valve crackle and pore, improve the hardness of valve, wear-resisting and good seal performance, extend the service life of valve.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
Embodiment 1
In the present embodiment, the casting technique of a kind of carbon steel valve, including following step:
(1) mould is made: make wooden model according to the shape of carbon steel valve, wooden model is provided with rising head and cast gate;
(2) sand molding: make sand mold with molding sand around wooden model, take out wooden model, is coated with one layer of high-temperature resistant coating in sand mold;Described molding sand is in parts by weight, including waterglass 2 parts, quartz sand 90 parts, ethylene diacetate 11 parts and clay 9 parts, described high-temperature resistant coating is in parts by weight, including Borax 20 parts, quartz sand 30 parts, 15 parts of coke, silane coupler 6 parts, polyethylene 10 parts and 70 parts of water;
(3) melting molten steel: be placed in three-phawse arc furnace by steel scrap, is warming up to 1600 DEG C, proceeds to decarbonizing furnace, after adding Calx, passes into oxygen, adds aluminum and ferromanganese, obtain molten steel after dephosphorization and desulfurization;
(4) cast: pour steel in sand mold, pouring temperature is 1580 DEG C;
(5) cooling: after natural cooling, clears up the ridges such as valve surface, excision cast gate, rising head, relief grinding burr and fash, again clears up residual sand, can obtain carbon steel valve.
Described molding sand is through the following steps that obtain: quartz sand is crossed 200 mesh sieves, is then sufficiently mixed with waterglass, ethylene diacetate and clay, then sinter 2h under 1200 DEG C of conditions, obtain molding sand through broken and screening after cooling.
Described high-temperature resistant coating through the following steps that obtain: quartz sand and coke reacts 2h under 2000 DEG C of conditions, are cooled to 800 DEG C, addition Borax, reaction 1h, after being cooled to room temperature, mixes with silane coupler, polyethylene and water for ball milling, standing, the water pumping upper strata obtains high-temperature resistant coating.
Wherein, modulus of water glass is 1.5, and in molten steel, phosphorus content is 0.5%, and phosphorus content is 0.01%.
Embodiment 2
A kind of moulding sand for casting, the casting technique of a kind of carbon steel valve, including following step:
(1) mould is made: make wooden model according to the shape of carbon steel valve, wooden model is provided with rising head and cast gate;
(2) sand molding: make sand mold with molding sand around wooden model, take out wooden model, is coated with one layer of high-temperature resistant coating in sand mold;Described molding sand is in parts by weight, including waterglass 3 parts, quartz sand 80 parts, ethylene diacetate 18 parts and clay 5 parts, described high-temperature resistant coating is in parts by weight, including Borax 30 parts, quartz sand 20 parts, 30 parts of coke, silane coupler 3 parts, polyethylene 16 parts and 50 parts of water;
(3) melting molten steel: be placed in three-phawse arc furnace by steel scrap, is warming up to 1620 DEG C, proceeds to decarbonizing furnace, after adding Calx, passes into oxygen, adds aluminum and ferromanganese, obtain molten steel after dephosphorization and desulfurization;
(4) cast: pour steel in sand mold, pouring temperature is 1600 DEG C;
(5) cooling: after natural cooling, clears up the ridges such as valve surface, excision cast gate, rising head, relief grinding burr and fash, again clears up residual sand, can obtain carbon steel valve.
Described molding sand is through the following steps that obtain: quartz sand is crossed 200 mesh sieves, is then sufficiently mixed with waterglass, ethylene diacetate and clay, then sinter 2h under 1200 DEG C of conditions, obtain molding sand through broken and screening after cooling.
Described high-temperature resistant coating through the following steps that obtain: quartz sand and coke reacts 2h under 1500 DEG C of conditions, are cooled to 600 DEG C, addition Borax, reaction 1h, after being cooled to room temperature, mixes with silane coupler, polyethylene and water for ball milling, standing, the water pumping upper strata obtains high-temperature resistant coating.
Wherein, modulus of water glass is 1.5, and in molten steel, phosphorus content is 0.2%, and phosphorus content is 0.005%.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvement and deformation, these improve and deformation also should be regarded as protection scope of the present invention.

Claims (5)

1. a casting technique for carbon steel valve, is characterized in that, including following step:
(1) mould is made: make wooden model according to the shape of valve, wooden model is provided with rising head and cast gate;
(2) sand molding: make sand mold with molding sand around wooden model, take out wooden model, is coated with one layer of high-temperature resistant coating in sand mold;Described molding sand is in parts by weight, including waterglass 2-3 part, quartz sand 80-90 part, ethylene diacetate 11-18 part and clay 5-9 part, described high-temperature resistant coating is in parts by weight, including Borax 20-30 part, quartz sand 20-30 part, coke 15-30 part, silane coupler 3-6 part, polyethylene 10-16 part and water 50-70 part;
(3) melting molten steel: be placed in three-phawse arc furnace by steel scrap, be warming up to 1600-1620 DEG C, proceeds to decarbonizing furnace, after adding Calx, passes into oxygen, adds aluminum and ferromanganese, obtain molten steel after dephosphorization and desulfurization;
(4) cast: pour steel in sand mold, pouring temperature is 1580-1600 DEG C;
(5) cooling: after natural cooling, clears up valve surface, excision cast gate, rising head, relief grinding burr and fash, clears up residual sand, can obtain carbon steel valve;
Described high-temperature resistant coating through the following steps that obtain: quartz sand and coke are reacted 2h under 1500-2000 DEG C of condition, it is cooled to 600-800 DEG C, add Borax, reaction 1h, after being cooled to room temperature, mixing with silane coupler, polyethylene and water for ball milling, stand, the water pumping upper strata obtains high-temperature resistant coating.
2. the casting technique of carbon steel valve according to claim 1, it is characterized in that, described molding sand through the following steps that obtain: quartz sand is crossed 200 mesh sieves, then it is sufficiently mixed with waterglass, ethylene diacetate and clay, then under 1200 DEG C of conditions, sinter 2h, after cooling, obtain molding sand through broken and screening.
3. the casting technique of carbon steel valve according to claim 1, is characterized in that, modulus of water glass is 1.5.
4. the casting technique of carbon steel valve according to claim 1, is characterized in that, in described molten steel, phosphorus content is 0.2-0.5%, and phosphorus content is less than 0.01%.
5. the carbon steel valve that the casting technique according to one claim of any of the above obtains.
CN201410261169.2A 2014-06-13 2014-06-13 A kind of casting technique of carbon steel valve CN104084524B (en)

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CN104493084B (en) * 2014-11-20 2018-07-27 周娟 A kind of manufacturing method of stainless steel valve and stainless steel valve obtained
CN107214298A (en) * 2017-06-22 2017-09-29 霍山县忠福机电科技有限公司 A kind of high pressure draining valve shell casting technique
CN107378397A (en) * 2017-07-17 2017-11-24 承德市帝圣金属复合材料有限公司 A kind of preparation method of metallic composite
CN107790639A (en) * 2017-09-29 2018-03-13 吴江市液铸液压件铸造有限公司 A kind of processing technology of spherical end cover casting
CN108591500A (en) * 2018-07-18 2018-09-28 天津万枫仪表有限公司 A kind of specific alloy regulating valve applied under high-pressure stage tiny flow quantity operating mode
WO2020024084A1 (en) * 2018-07-28 2020-02-06 苏州速腾电子科技有限公司 Copper alloy valve processing technology
CN108913982A (en) * 2018-08-06 2018-11-30 苏州速腾电子科技有限公司 A kind of production method of valve
CN109465389A (en) * 2018-11-20 2019-03-15 吴江市格瑞福金属制品有限公司 A kind of preparation process of baking tray
CN110385399A (en) * 2019-06-15 2019-10-29 浙江安驰建设有限公司 A kind of preparation process of urban construction drain valve
CN111151717A (en) * 2020-01-18 2020-05-15 四川永森航空材料科技有限公司 Casting process of photoelectric control valve

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Effective date of registration: 20200512

Address after: 362304 Meiyu valve Park, Luncang Town, Nan'an City, Quanzhou City, Fujian Province

Patentee after: Fujian Nan'an Hengjun Foundry Co., Ltd

Address before: 215213, 6, Longjiang Road, Fen Lake Economic Development Zone, Wujiang, Jiangsu, Suzhou

Patentee before: Wujiang Hydraulic Components Foundry Co.,Ltd.

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