CN100467166C - Method for founding main regulation valve body of steam turbine - Google Patents
Method for founding main regulation valve body of steam turbine Download PDFInfo
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- CN100467166C CN100467166C CNB2007100235134A CN200710023513A CN100467166C CN 100467166 C CN100467166 C CN 100467166C CN B2007100235134 A CNB2007100235134 A CN B2007100235134A CN 200710023513 A CN200710023513 A CN 200710023513A CN 100467166 C CN100467166 C CN 100467166C
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Abstract
The present invention is process of casting valve body of main steam regulating valve for steam turbine and belongs to the field of metal casting technology. The casting process includes one vertical casting step and two steps of heat treatment to eliminate shrinkage faults. The casting process can produce casting of valve body with high mechanical performance.
Description
Technical field
The invention belongs to field of metal casting technology, refer in particular to the casting method of main regulation valve body of steam on the steam turbine.
Background technology
Main regulation valve body of steam is the critical component on the steam turbine, and the production difficulty is very big, and the past relies on external production always, and domestic have indivedual producers once to produce as a trial, does not produce in batches but form, and its casting method is:
1. adopt the flat flat pouring technique of doing.The valve body horizontal positioned, both sides are provided with running gate system, and flange top is provided with 3 rising heads in order to replenish molten steel.
2. place chill at the flange position and strengthen cooling, will use the high roughing sand of refractoriness for valve body extexine molding sand and inner chamber core sand.
3. heat treatment is generally in air and cools off.
The deficiency that said method exists is: the rising head size is big during horizontal positioned, and rising head quantity is many, and the feeding condition is poor, and the foundry goods appearance scab of production is serious, and the inner chamber core sand easily is difficult to cleaning by the molten steel sintering; The normalized treatment foundry goods that cools off in air, its mechanical performance should not guarantee.In order to address these problems, the logical compressed air in the core of core cavity that has is to strengthen inner cooling, the outside is made casting mold with metal-back and is strengthened external refrigeration, adopt the Technology for Heating Processing of shrend, the logical compressed air method of this kind need dispose a covering device, it is very high again that metal-back is made the casting mold cost, and water quenching technology need dispose the quenching tank, and heat treated crackle taxis is bigger during the foundry goods shrend.Given this be difficult for forming producing in batches.
Summary of the invention
The present invention is just in order to overcome above-mentioned deficiency, a kind of casting method that can manufacture out qualified main regulation valve body of steam turbine is provided, main innovation is to have adjusted casting and Technology for Heating Processing, and plane vertical pouring technology is taked in casting, and the two-stage heat treating regime is adopted in heat treatment.Specifically implement like this: the casting method of main regulation valve body of steam turbine is characterized in that casting and takes plane vertical pouring technology, that is:
A) flatly do casting mold: keep flat mould, the magnesium carbon granule that covers 50-100mm at die surface is as surface layer, and all the other floor sands are filled; Place every sand cooling iron every layer of sand 10-30mm by interval 50-100mm at the flange position; Blow carbon dioxide gas sclerosis casting mold, take out mould, casting mold is put into drying kiln dried by the fire 12-16 hour brushing zirconium English powder water based paint behind the kiln discharge at 150-300 ℃ down;
B) vertical pouring: pour into a mould erecting after fastening the getting well of a few part casting molds assemblings, both sides are equipped with the several layers cast gate from top to bottom successively, and a rising head is set on the top end face, and the rising head bottom is equipped with subsidy; Elder generation's filling casting mold bottom during liquid metal filling, after being full of, the bottom then fills molten metal from second layer cast gate, and the like from the bottom to the full casting mold of top-pour, pouring temperature is controlled at 1550-1559 ℃, be controlled at the duration of pouring within 2-4 minute, foundry goods cools off in casting mold and unpacked in 56-72 hour after pouring, and unpacking temperature is controlled at 350-250 ℃.
This plane vertical pouring technology is by the principle design running gate system of steadily filling the favourable feeding foundry goods of type, by from down and on casting step by step, can make full use of gravity, forms favourable feeding in proper order.At the foundry goods top end face rising head only is set in addition, rising head is made of insulation ring and warming plate, has saved cost of investment.This technology also end face and the circumference of the flange on valve body is provided with the setting rate that chill is strengthened this position.
Behind the cast cleaning, adopt the two-stage heat treating regime, eliminate casting stress and even metallographic structure, implement normalized and tempered technology with spray method with conditioning treatment, specific as follows:
A) conditioning treatment: will clear up good foundry goods, be not less than 150 ℃ of heat-treatment furnaces heating of packing in temperature and be warming up to 600-650 ℃ in 10-13 hour and kept this temperature 2-5 hour; Heat again and be warming up to 980-1100 ℃ in 8-12 hour and kept this temperature 26-30 hour, close burner then and make foundry goods in stove, be cooled to 200-350 ℃ to come out of the stove with the stove cooling;
B) after conditioning treatment finishes, foundry goods pulled out from heat-treatment furnace carry out heat immediately and cut rising head, casting temperature remained on 150-350 ℃ when heat was cut rising head.Again go up kiln heating if temperature is lower than 150-200 ℃ of need in the middle of cutting process, casting temperature remains on 150-350 ℃ when guaranteeing that heat is cut rising head.
C) normalized treatment foundry goods was warming up to pack into heat-treatment furnace heating of foundry goods in 10-13 hour 600-650 ℃ and kept this temperature 2-5 hour; Heat again and be warming up to 900-1000 ℃ of this temperature of maintenance in 8-12 hour 16-22 hour, then foundry goods is pulled out from stove, to the cast(ing) surface atomized water spray, spray earlier 40-60 minute stopped 50-60 minute, sprayed 15-20 minute again, stopped again 50-60 minute, circulation is spray process for the second time, inserts airduct at core cavity simultaneously and is blown into compressed air, up to below 100 ℃.
D) temper: the foundry goods shove charge is warming up to 680-700 ℃ of insulation 20-24 hour with 50-70 ℃ the rate of heat addition per hour, is cooled to 250-350 ℃ with 50-70 ℃ speed per hour again, foundry goods is pulled out the stove cool to room temperature.
The present invention adopts plane vertical pouring technology, has solved the defective that feeding produced, and adopts the spraying Technology for Heating Processing to meet or exceed mechanical performance index, successful mass production main regulation valve body of steam turbine, solved the problem that is difficult to produce.
The technology quality index of this foundry goods is:
Chemical composition:
C≤0.18％ Mn＝0.40-0.70％ Si≤0.60％ S≤0.030％ P≤0.030％ Cr＝2.00-2.75％
Mo＝0.90-1.20％ Ni≤0.30％ Cu≤0.30％ Al≤0.30％
Mechanical performance:
Rm＝485-660MPa Rp
0.2≥275MPa A
4≥20％ Z≥35％
Surface and inherent quality require:
Nondestructive inspection reaches MT and detects one-level; UT detects the secondary requirement.
Size reaches the drawing requirement.
Description of drawings
Accompanying drawing is a structural representation of the present invention.
The specific embodiment
The casting method of main regulation valve body of steam turbine, take plane vertical pouring and secondary Technology for Heating Processing:
1. plane vertical pouring:
A) flatly do casting mold: keep flat mould, the magnesium carbon granule that covers 50-100mm at die surface is as surface layer, and all the other floor sands are filled; At the flange position (end face and circumference) at interval 50-100mm place 10-30mm every sand cooling iron every layer of sand 1; Blow carbon dioxide gas sclerosis casting mold, take out mould, casting mold is put into drying kiln dried by the fire 12-16 hour brushing zirconium English powder water based paint behind the kiln discharge at 150-300 ℃ down;
B) vertical pouring: pour into a mould with erecting after fastening the getting well of a few part casting molds assemblings, both sides are equipped with several layers (generally can be three to four layers or decide according to concrete condition) cast gate 2 from top to bottom successively, a rising head 3 of being made by insulation ring and warming plate is set on the top end face, and rising head 3 bottoms are equipped with subsidy; Elder generation's filling casting mold bottom during liquid metal filling, after being full of, the bottom then fills molten metal from second layer cast gate, and the like from the bottom to the full casting mold of top-pour, pouring temperature is controlled at 1550-1559 ℃, be controlled at the duration of pouring within 2-4 minute, foundry goods cools off in casting mold and unpacked in 56-72 hour after pouring, and unpacking temperature is controlled at 350-250 ℃.
2. two levels of thermal is handled:
A) conditioning treatment: will clear up good foundry goods, be not less than 150 ℃ of heat-treatment furnaces heating of packing in temperature and be warming up to 600-650 ℃ in 10-13 hour and kept this temperature 2-5 hour; Heat again and be warming up to 980-1100 ℃ in 8-12 hour and kept this temperature 26-30 hour, close burner then and make foundry goods in stove, be cooled to 200-350 ℃ to come out of the stove with the stove cooling;
B) heat is cut rising head: after conditioning treatment finishes, foundry goods pulled out from heat-treatment furnace carry out heat immediately and cut rising head, casting temperature remained on 150-350 ℃ when heat was cut rising head, went up the kiln heating again if temperature is lower than 150-200 ℃ of need in the middle of cutting process;
C) normalized treatment foundry goods: pack into heat-treatment furnace heating of foundry goods was warming up to 600-650 ℃ in 10-13 hour and kept this temperature 2-5 hour; Heat again and be warming up to 900-1000 ℃ of this temperature of maintenance in 8-12 hour 16-22 hour, then foundry goods is pulled out from stove, to the cast(ing) surface atomized water spray, spray earlier 40-60 minute stopped 50-60 minute, sprayed 15-20 minute again, stopped again 50-60 minute, circulation is spray process for the second time, inserts airduct at core cavity simultaneously and is blown into compressed air, up to below 100 ℃;
D) temper: the foundry goods shove charge is warming up to 680-700 ℃ of insulation 20-24 hour with 50-70 ℃ the rate of heat addition per hour, is cooled to 250-350 ℃ with 50-70 ℃ speed per hour again, the foundry goods cool to room temperature of coming out of the stove.
Claims (7)
1. the casting method of main regulation valve body of steam turbine is characterized in that casting and takes plane vertical pouring technology, that is:
A) flatly do casting mold: keep flat mould, cover the magnesium carbon granule as surface layer at die surface, all the other floor sands are filled; Place every sand cooling iron every layer of sand at the flange portion bit interval; Blow the hardening carbon dioxide gas casting mold, take out mould, casting mold is put into drying kiln dried by the fire 12-16 hour brushing zirconium English powder water based paint behind the kiln discharge at 150-300 ℃ down;
B) vertical pouring: pour into a mould erecting after fastening the getting well of a few part casting molds assemblings, both sides are disposed with the several layers cast gate from top to bottom, and a rising head is set on the top end face, and the rising head bottom has subsidy; Elder generation's filling casting mold bottom during liquid metal filling, after being full of, the bottom then fills molten metal from second layer cast gate, and the like from the bottom to the full casting mold of top-pour, pouring temperature is controlled at 1550-1559 ℃, be controlled at the duration of pouring within 2-4 minute, foundry goods cools off in casting mold and unpacked in 56-72 hour after pouring, and unpacking temperature is controlled at 350-250 ℃.
2. casting method according to claim 1 is characterized in that the thick 50-100mm of magnesium carbon granule surface layer.
3. casting method according to claim 1, it is characterized in that the end face at casting mold flange position and circumference be equipped with described every sand cooling iron every layer of sand, chill spacing 50-100mm.
4. casting method according to claim 3 is characterized in that every sand cooling iron every the thick 10-30mm of being of layer of sand.
5. casting method according to claim 1 is characterized in that rising head is by insulation ring and warming plate making.
6. according to claim 1,2,3,4, one of 5 described casting methods, it is characterized in that the cast cleaning behind the outlet after, adopt two levels of thermal to handle:
A) conditioning treatment: will clear up good foundry goods, be not less than 150 ℃ of heat-treatment furnaces heating of packing in temperature and be warming up to 600-650 ℃ in 10-13 hour and kept this temperature 2-5 hour; Heat again and be warming up to 980-1100 ℃ in 8-12 hour and kept this temperature 26-30 hour, close burner then and make foundry goods in stove, be cooled to 200-350 ℃ to come out of the stove with the stove cooling;
B) after conditioning treatment finishes, foundry goods pulled out from heat-treatment furnace carry out heat immediately and cut rising head, casting temperature remained on 150-350 ℃ when heat was cut rising head;
C) normalized treatment foundry goods was warming up to pack into heat-treatment furnace heating of foundry goods in 10-13 hour 600-650 ℃ and kept this temperature 2-5 hour; Heat again and be warming up to 900-1000 ℃ in 8-12 hour and kept this temperature 16-22 hour, then foundry goods is pulled out from stove, to the cast(ing) surface atomized water spray, spray earlier 40-60 minute stopped 50-60 minute, sprayed 15-20 minute again, stopped 50-60 minute, circulation is spray process for the second time, up to below 100 ℃ again;
D) temper: the foundry goods shove charge is warming up to 680-700 ℃ of insulation 20-24 hour with 50-70 ℃ the rate of heat addition per hour, again with 50-70 ℃ speed per hour at descent of temperature to 250-350 ℃, the cool to room temperature of coming out of the stove then.
7. casting method according to claim 6 when it is characterized in that the normalized treatment foundry goods, is inserted airduct at core cavity simultaneously and is blown into compressed air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100235134A CN100467166C (en) | 2007-06-04 | 2007-06-04 | Method for founding main regulation valve body of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100235134A CN100467166C (en) | 2007-06-04 | 2007-06-04 | Method for founding main regulation valve body of steam turbine |
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| CN101081432A CN101081432A (en) | 2007-12-05 |
| CN100467166C true CN100467166C (en) | 2009-03-11 |
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| CNB2007100235134A Expired - Fee Related CN100467166C (en) | 2007-06-04 | 2007-06-04 | Method for founding main regulation valve body of steam turbine |
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| CN109108221A (en) * | 2018-09-27 | 2019-01-01 | 欧通集团青田万鑫阀门科技有限公司 | The production technology of fast opening and closing power station exhaust check valve casting |
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| CN85109022A (en) * | 1985-05-07 | 1986-11-05 | 株式会社小松制作所 | The manufacture method of casting mold |
| CN2306093Y (en) * | 1997-08-07 | 1999-02-03 | 李一纬 | Various mixed material lamination mould |
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- 2007-06-04 CN CNB2007100235134A patent/CN100467166C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109022A (en) * | 1985-05-07 | 1986-11-05 | 株式会社小松制作所 | The manufacture method of casting mold |
| CN2306093Y (en) * | 1997-08-07 | 1999-02-03 | 李一纬 | Various mixed material lamination mould |
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| CN101081432A (en) | 2007-12-05 |
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Address after: 214213 apricot Road, Yixing Economic Development Zone, Jiangsu Patentee after: Jiangsu Lingte Fine Machinery Co., Ltd. Address before: 214213 apricot Road, Yixing Economic Development Zone, Yixing, Jiangsu Patentee before: Wuxi Little Swan Precision Casting Co., Ltd. |
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