CN102294468A - Enhanced cooling process of wind power nodular iron casting - Google Patents
Enhanced cooling process of wind power nodular iron casting Download PDFInfo
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- CN102294468A CN102294468A CN2011102218214A CN201110221821A CN102294468A CN 102294468 A CN102294468 A CN 102294468A CN 2011102218214 A CN2011102218214 A CN 2011102218214A CN 201110221821 A CN201110221821 A CN 201110221821A CN 102294468 A CN102294468 A CN 102294468A
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Abstract
The invention discloses an enhanced cooling process of a wind power nodular iron casting, belonging to the technical field of casting. The enhanced cooling process has the following main characteristics and steps of: 1) weaving a screen mesh from an iron wire with a diameter in a range of 0.5-3mm; 2) cutting the woven iron wire screen into an appropriate size according to the shape of the hot spot part of the casting, and fixing the iron wire screen in the cavity of the hot spot part; and 3) pouring nodular cast molten iron previously subjected to nodulizing inoculation treatment into a casting mould. The enhanced cooling process disclosed by the invention has the beneficial effects that: the iron wire screen embedded into the casting mould functions as micro-inner chills in dispersion distribution, so that the casting cooling is enhanced; the coagulation time ofthe wind power casting is greatly shortened, so that distortion of graphite nodules is prevented, and the roundness and the number of the graphite nodules are improved; furthermore, the mechanical properties are improved.
Description
Affiliated technical field
The present invention relates to a kind of reinforcement process for cooling of wind-powered electricity generation nodular iron casting, belong to the ferrous metal casting field, shorten setting time, thereby improve wind-powered electricity generation foundry goods mechanical performance by cooling in reinforced.
Background technology
Wind-power electricity generation is a wind energy clean utilization effective and efficient manner the most.High-quality wind-powered electricity generation foundry goods is the reliability service of wind power generating set, effectively utilizes the key of wind energy.The wind power generator group is installed in the field more, and the working condition harshness proposes high requirement to the quality of wind-powered electricity generation foundry goods.
The ferrite ductile cast iron obdurability is good, is the material of Large-scale Wind Turbines foundry goods first-selection.But the common wall thickness of large-scale wind electricity foundry goods surpasses 100mm, and even weight reaches several tons of tens of tons.This class super large ductile iron spare graphite nodule in process of setting distorts easily, needs strict control composition and technological measure could obtain qualified foundry goods.
The basic reason of graphite morphology is that setting time is long in the large-scale ductile iron spares such as wind-powered electricity generation foundry goods, causes in the graphite nodule growth process, can't keep spherical.Strengthening the foundry goods cooling, shorten setting time, is to control the comparatively general method of graphite morphology at present.For guaranteeing the Performance And Reliability of wind-powered electricity generation foundry goods, must strengthen the foundry goods cooling, shorten the setting time of foundry goods.
Common technological measure is to add circulating water cooling system by external chill or in core for cast to realize.These method complex technical process, poor reliability, application for a patent for invention discloses a kind of pressure cooling system of thick and large section casting parts as ZL200710144925.3, controls the solidified structure of large-scale ductile iron spare by the reinforcement cooling setting-time control.But do not relate to by the technology that the disperse distribution has the small internal densener realization large-scale ductile iron spare graphite morphology control of chilling action is set in the type.
Summary of the invention
The invention provides disperse Quench in a kind of realization type, strengthen the foundry goods cooling, thus the reinforcement process for cooling of the wind-powered electricity generation nodular iron casting of control wind-powered electricity generation foundry goods graphite morphology, raising mechanical performance.
Technical scheme of the present invention is as follows: a kind of reinforcement process for cooling of wind-powered electricity generation nodular iron casting comprises with iron wire and works out wire netting; With shape and the big or small cutting of the wire netting made according to casting heat energy-saving position, be fixed on then in the die cavity of heat energy-saving position, the ductile iron liquid after again spheroidization and inoculation being handled pours into casting mold; Concrete steps are:
1) Fe measures more than 95% with containing, surplus is C, diameter 0.1～3mm iron wire establishment wire netting; Wire netting has into individual layer square mesh, and the spacing between iron wire and iron wire is 0.1～20mm.
2) after wire netting is worked out, the dry processing of pickling is carried out on the wire netting surface, removed surperficial iron rust, greasy dirt.
3) wire netting of making is kept dry, is not had greasy dirt, according to the shape of casting heat energy-saving position, be cut into ironcasting be complementary size, be fixed in the die cavity of heat energy-saving position.
4) the ductile iron liquid after the spheroidization and inoculation processing is poured into casting mold, cast temperature is 1280 ℃～1340 ℃.
The invention has the beneficial effects as follows: be embedded in the effect that wire netting in the casting mold plays the small internal densener that disperse distributes, thereby strengthen the foundry goods cooling, the wind-powered electricity generation casting solidification time is shortened greatly, thereby prevent fading and nodular graphite degeneration, improve graphite nodule roundness and nodule number, and then improve mechanical performance.
The specific embodiment
Below in conjunction with embodiments of the invention, further specify technical scheme of the present invention and effect.
Embodiment 1
Present embodiment explanation 3MW wind-powered electricity generation foundry goods wheel hub casts uses the production process and the effect of technology disclosed in this invention.
Select diameter 0.5mm for use, the iron wire of iron-holder 99.5%, the wire netting of braiding growth 2000mm, wide 500mm, mesh size 5mm * 5mm, it is through acid pickling and rust removing drying that degreases then.
After moulding finishes, according to the geomery of wheel hub casts, wire netting is cut into ironcasting is complementary, be fixed on casting mold die cavity center, mould assembly is cast then.1300 ℃ of iron liquid cast temperatures.
Solidify back dissection carrying out fabric analysis fully on foundry goods, the result shows, compare with the foundry goods that does not use process casting disclosed by the invention, the spheroidization of graphite rate at foundry goods center brings up to 79% from 72%, the unit are number of graphite ball is brought up to 48/square millimeter from 32/square millimeter, tensile strength is brought up to 411.6MPa from 368.4MPa, and room temperature impact flexibility mean value is brought up to 41J from 26J, and-20 ℃ of impact flexibility mean values are brought up to 16J from 10J.
Embodiment 2
Present embodiment explanation 1MW wind-powered electricity generation foundry goods wheel hub casts uses the production process and the effect of technology disclosed in this invention.
According to method provided by the invention, select diameter 0.2mm for use, the iron wire of iron-holder 99.5%, the wire netting of braiding growth 2000mm, wide 500mm, mesh size 3mm * 3mm, it is through acid pickling and rust removing drying that degreases then.
After moulding finished, the geomery according to the wheel hub casts was cut into suitable size with wire netting, is fixed on casting mold die cavity center, and mould assembly is cast then.1320 ℃ of iron liquid cast temperatures.Solidify back dissection carrying out fabric analysis fully on foundry goods, the result shows, compare with the foundry goods that does not use process casting disclosed by the invention, the spheroidization of graphite rate at foundry goods center rises to 84% from 78%, the unit are number of graphite ball is brought up to 50/square millimeter from 36/square millimeter, tensile strength is brought up to 415.2MPa from 372.4MPa, and room temperature impact flexibility mean value is brought up to 43J from 29J, and-20 ℃ of impact flexibility mean values are brought up to 17J from 12J.
Claims (7)
1. the reinforcement process for cooling of a wind-powered electricity generation nodular iron casting is characterized in that, this technical process may further comprise the steps:
1) works out wire netting with iron wire;
2) with the wire netting made shape, be cut into the size that is complementary with ironcasting, be fixed in the die cavity of heat energy-saving position according to casting heat energy-saving position.
3) the ductile iron liquid after the spheroidization and inoculation processing is poured into casting mold.
2. the reinforcement process for cooling of wind-powered electricity generation nodular iron casting according to claim 1 is characterized in that, described iron wire diameter is 0.5～3mm, contains the Fe amount more than 95% that surplus is C.
3. the reinforcement process for cooling of wind-powered electricity generation nodular iron casting according to claim 1 is characterized in that, described wire netting mesh is the individual layer square.
4. according to the reinforcement process for cooling of claim 1 or 3 described wind-powered electricity generation nodular iron castings, it is characterized in that described wire netting mesh size is 0.1～20mm * 0.1～20mm.
5. the reinforcement process for cooling of wind-powered electricity generation nodular iron casting according to claim 1 is characterized in that, the wire netting after working out needs the dry processing of pickling is carried out on its surface, removes surperficial iron rust, greasy dirt.
6. the reinforcement process for cooling of wind-powered electricity generation nodular iron casting according to claim 1, it is characterized in that, described step 2) is the shape of the large-scale ductile iron heat energy-saving position of casting as required, wire netting is cut into the big or small wire netting that is complementary with ironcasting, be fixed in the casting mold die cavity.
7. the reinforcement process for cooling of wind-powered electricity generation nodular iron casting according to claim 1 is characterized in that, wire netting is fixed in the casting mold die cavity after the mould assembling, and the temperature of the ductile iron liquid of casting is 1280 ℃～1340 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102218214A CN102294468A (en) | 2011-07-28 | 2011-07-28 | Enhanced cooling process of wind power nodular iron casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102218214A CN102294468A (en) | 2011-07-28 | 2011-07-28 | Enhanced cooling process of wind power nodular iron casting |
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| CN102294468A true CN102294468A (en) | 2011-12-28 |
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| CN2011102218214A Pending CN102294468A (en) | 2011-07-28 | 2011-07-28 | Enhanced cooling process of wind power nodular iron casting |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105537522A (en) * | 2016-02-22 | 2016-05-04 | 江苏钜源机械有限公司 | Technological method of using internal chill for expendable pattern negative pressure casting |
| CN107716859A (en) * | 2017-12-11 | 2018-02-23 | 上海魁殊自动化科技有限公司 | A kind of case casting device altogether |
| CN111974946A (en) * | 2020-08-19 | 2020-11-24 | 李恪 | Composite casting method |
| CN114406192A (en) * | 2021-12-27 | 2022-04-29 | 国铭铸管股份有限公司 | Manufacturing method of wind power ductile iron casting |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101406943A (en) * | 2008-11-18 | 2009-04-15 | 西安建筑科技大学 | Method for preparing nodular cast iron-base composite material for in situ production of chromium carbide |
| CN101406946A (en) * | 2008-11-18 | 2009-04-15 | 西安建筑科技大学 | Method for preparing nodular cast iron-base in situ composite |
| CN101829779A (en) * | 2009-03-09 | 2010-09-15 | 吴强 | Method for performing in-mould cooling of large casting by using cored wire or solid wire |
| CN101979186A (en) * | 2010-11-16 | 2011-02-23 | 昆明理工大学 | Method for controlling graphite distortion of large-sized nodular iron casting |
-
2011
- 2011-07-28 CN CN2011102218214A patent/CN102294468A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101406943A (en) * | 2008-11-18 | 2009-04-15 | 西安建筑科技大学 | Method for preparing nodular cast iron-base composite material for in situ production of chromium carbide |
| CN101406946A (en) * | 2008-11-18 | 2009-04-15 | 西安建筑科技大学 | Method for preparing nodular cast iron-base in situ composite |
| CN101829779A (en) * | 2009-03-09 | 2010-09-15 | 吴强 | Method for performing in-mould cooling of large casting by using cored wire or solid wire |
| CN101979186A (en) * | 2010-11-16 | 2011-02-23 | 昆明理工大学 | Method for controlling graphite distortion of large-sized nodular iron casting |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105537522A (en) * | 2016-02-22 | 2016-05-04 | 江苏钜源机械有限公司 | Technological method of using internal chill for expendable pattern negative pressure casting |
| CN107716859A (en) * | 2017-12-11 | 2018-02-23 | 上海魁殊自动化科技有限公司 | A kind of case casting device altogether |
| CN107716859B (en) * | 2017-12-11 | 2024-02-13 | 阜新建兴金属有限公司 | Co-tank casting device |
| CN111974946A (en) * | 2020-08-19 | 2020-11-24 | 李恪 | Composite casting method |
| CN114406192A (en) * | 2021-12-27 | 2022-04-29 | 国铭铸管股份有限公司 | Manufacturing method of wind power ductile iron casting |
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Application publication date: 20111228 |