CN102371340A - Lost foam casting method for large casting - Google Patents
Lost foam casting method for large casting Download PDFInfo
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- CN102371340A CN102371340A CN2011103072582A CN201110307258A CN102371340A CN 102371340 A CN102371340 A CN 102371340A CN 2011103072582 A CN2011103072582 A CN 2011103072582A CN 201110307258 A CN201110307258 A CN 201110307258A CN 102371340 A CN102371340 A CN 102371340A
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Abstract
The invention discloses a lost foam casting method for a large casting, which comprises the following steps of: regulating lost foam coating ingredients; molding by adopting clay sand to guarantee the integral air permeability of the casting; and meanwhile, combining with the mode of vacuumizing negative-pressure pouring to quickly discharge and pump foam model vapour so as to realize the lost foam casting of a large stainless steel or alloy cast iron alloy casting. The method disclosed by the invention has lower cost in comparison with precise investment casting, and the casting prepared by adopting the method has better comprehensive mechanical properties superior to the casting casted by common gravity.
Description
Technical field
The present invention relates to casting field, particularly the lost foam casting field.
Background technology
Lost foam casting is called the real core casting of vacuum in China, and the American then is called disappearance mould and gasified pattern casting, is called EPC technology in the world.Lost foam casting is to replace metal and wooden model with bubbles model, and bubbles model does not take out after the moulding, is the entity die cavity; Promptly one is retained in the casting mold with the on all four bubbles model of foundry goods shape, adopts conventional lost foam casting pouring procedure, after iron liquid pours into sandbox; Foam burns under the molten iron hot environment, gasification, and at present common lost-foam casting method is to utilize the expanded material of mixing such as polystyrene to process the model consistent with foundry goods; Model is placed sandbox; Insert dry sand, and model exocoel and core are partly carried out vibration ramming, vacuumize at sandbox top plastic covering film and in afterwards sandbox; Copy the foundry goods the same, take out foundry goods after the condensation with foamed polystyrene pattern.Patent application is 200310121116.2; Name is called " lost-foam casting method of engine cylinder-body "; Its processing step of casting method that discloses a kind of mould that disappears comprises: in sandbox, place the disappearance mould model of processing with expanded material the same with foundry goods; Back-up sand in advance in the cavity of this model mid portion, preparatory then vibration ramming, last forvacuum; Mid portion at described disappearance mould model is manufactured formwork shell separately, it is combined in the block mold again.In sandbox, insert dry sand and vibration ramming, the plastic covering film at the sandbox top is to vacuumizing in the sandbox; Molten metal is cast to described disappearance mould model area, solidifies fully, before described disappearance mould model places sandbox until foundry goods; At first adopt this method to produce the engine cylinder-body foundry goods; Technology is advanced, and the mould manufacturing is simplified, and yield rate is high, production cost is low.The method also can be used for making the complicated foundry goods of other die cavity.Yet for large-scale foundry goods; Because the volume of foundry goods is too big; This casting method is producing that foundry goods exists because the gas row of gasification is not come out, especially when producing the large-size stainless steel foundry goods with metal alloy castings, because vapour eliminating unclean in the die cavity; Cause the pore in the foundry goods many, and seriously influence the quality of large-size stainless steel foundry goods.Therefore, rarely has the report of producing heavy castings with the disappearance mould in the prior art.
Summary of the invention
To the deficiency of prior art, one of the object of the invention is to provide a kind of lost-foam casting method of heavy castings.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is following:
A kind of lost-foam casting method of heavy castings comprises the steps:
1) utilizes the Computer Design foamed polystyrene pattern according to the foundry goods shape, utilize Cutter Body Processing with Machining Center to go out foam plastics mould then;
2) the foam plastics mould outside is coated with extension lost foam paint, consisting of of coating by weight percentage: bauxite 30-40%, pyrophyllite powder 20-30%; Zircon powder 10-20%, lithium bentonite 3.5-4.5%, sodium carboxymethylcellulose 1.5-2.5%; N-butanol 0.3-0.6%, surplus is a water; Thickness of coating layer is 1-2mm; Be coated with and hang the back drying;
3) foamed polystyrene pattern behind the coating is placed sandbox, use the clay-bonded sand moulding;
4) sandbox after the moulding places on the jolt ramming device sand jolt ramming, drying is used in the moulding in the case;
5) casting stainless steel or alloy cast iron liquid the time, sandbox is vacuumized synchronously with evacuator, vacuumize and gas purification handle after, discharging;
6) cast finishes, and continues to vacuumize 20-30 minute, with promptly getting the foundry goods blank after the casting mold cooling.
Preferably, the 2nd) coating in step consists of: bauxite 35%, and pyrophyllite powder 25%, zircon powder 15%, lithium bentonite 4%, sodium carboxymethylcellulose 2%, n-butanol 0.5%, surplus is a water.
Preparation method of the present invention has following beneficial effect:
1. through adjustment lost foam paint composition; Improved the gas permeability of coating; Adopt the clay-bonded sand moulding simultaneously, further guaranteed the whole gas permeability of casting mold, combine to vacuumize vacuum-assist pouring simultaneously; Make the bubbles model vapour in the casting process discharge rapidly and taken away, thereby realized the lost foam casting of large-size stainless steel or alloy cast iron alloy-steel casting.
2. adopt the stainless steel or the metallographic structure of alloy cast iron heavy castings of the inventive method preparation fine and close, crystal grain is tiny, pore-free, casting flaw such as loose, and newly net forming, and cast(ing) surface is highly polished.
3. the inventive method is lower than the cost that adopts precision-investment casting, and more excellent than the comprehensive mechanical property of traditional gravity casting gained foundry goods.
The specific embodiment
Embodiment one
A kind of lost-foam casting method of engine of boat and ship housing alloy iron casting comprises the steps:
1) utilizes the Computer Design foamed polystyrene pattern according to the foundry goods shape, utilize Cutter Body Processing with Machining Center to go out foam plastics mould then;
2) the foam plastics mould outside is coated with extension lost foam paint, consisting of of coating by weight percentage: bauxite 30%, and pyrophyllite powder 30%, zircon powder 10%, lithium bentonite 4.5%, sodium carboxymethylcellulose 1.5%, n-butanol 0.6%, surplus is a water; Thickness of coating layer is 1mm; Be coated with and hang the back drying;
3) foamed polystyrene pattern behind the coating is placed sandbox, use the clay-bonded sand moulding;
4) sandbox after the moulding places on the jolt ramming device sand jolt ramming, drying is used in the moulding in the case;
5) cast alloy cast iron liquid the time, sandbox is vacuumized synchronously with evacuator, vacuumize and gas purification handle after, discharging;
6) cast finishes, and continues to vacuumize 20 minutes, with promptly getting the foundry goods blank after the casting mold cooling.
Embodiment two
A kind of lost-foam casting method of engine of boat and ship housing alloy iron casting comprises the steps:
1) utilizes the Computer Design foamed polystyrene pattern according to the foundry goods shape, utilize Cutter Body Processing with Machining Center to go out foam plastics mould then;
2) the foam plastics mould outside is coated with extension lost foam paint, consisting of of coating by weight percentage: bauxite 40%, and pyrophyllite powder 20%, zircon powder 20%, lithium bentonite 3.5%, sodium carboxymethylcellulose 2.5%, n-butanol 0.3%, surplus is a water; Thickness of coating layer is 2mm; Be coated with and hang the back drying;
3) foamed polystyrene pattern behind the coating is placed sandbox, use the clay-bonded sand moulding;
4) sandbox after the moulding places on the jolt ramming device sand jolt ramming, drying is used in the moulding in the case;
5) cast alloy cast iron liquid the time, sandbox is vacuumized synchronously with evacuator, vacuumize and gas purification handle after, discharging;
6) cast finishes, and continues to vacuumize 30 minutes, with promptly getting the foundry goods blank after the casting mold cooling.
Embodiment three
The lost-foam casting method of the large-scale pedestal of a kind of stainless steel comprises the steps:
1) utilizes the Computer Design foamed polystyrene pattern according to the foundry goods shape, utilize numerical control machining center to process foam plastics mould then;
2) the foam plastics mould outside is coated with extension lost foam paint, consisting of of coating by weight percentage: bauxite 35%, and pyrophyllite powder 25%, zircon powder 15%, lithium bentonite 4%, sodium carboxymethylcellulose 2%, n-butanol 0.5%, surplus is a water; Thickness of coating layer is 1.5mm; Be coated with and hang the back drying;
3) foamed polystyrene pattern behind the coating is placed sandbox, use the clay-bonded sand moulding;
4) sandbox after the moulding places on the jolt ramming device sand jolt ramming, drying is used in the moulding in the case;
5) casting stainless steel liquid the time, sandbox is vacuumized synchronously with evacuator, vacuumize and gas purification handle after, discharging;
6) cast finishes, and continues to vacuumize 25 minutes, with promptly getting the foundry goods blank after the casting mold cooling.
Applicant's statement; The present invention explains detailed process equipment of the present invention and technological process through the foregoing description; But the present invention is not limited to above-mentioned detailed process equipment and technological process, does not mean that promptly the present invention must rely on above-mentioned detailed process equipment and technological process could be implemented.The person of ordinary skill in the field should understand, and to any improvement of the present invention, to the interpolation of the equivalence replacement of each raw material of product of the present invention and auxiliary element, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (2)
1. the lost-foam casting method of heavy castings is characterized in that, comprises the steps:
1) utilizes the Computer Design foamed polystyrene pattern according to the foundry goods shape, utilize Cutter Body Processing with Machining Center to go out foam plastics mould then;
2) the foam plastics mould outside is coated with extension lost foam paint, consisting of of coating by weight percentage: bauxite 30-40%, pyrophyllite powder 20-30%; Zircon powder 10-20%, lithium bentonite 3.5-4.5%, sodium carboxymethylcellulose 1.5-2.5%; N-butanol 0.3-0.6%, surplus is a water; Thickness of coating layer is 1-2mm; Be coated with and hang the back drying;
3) foamed polystyrene pattern behind the coating is placed sandbox, use the clay-bonded sand moulding;
4) sandbox after the moulding places on the jolt ramming device sand jolt ramming, drying is used in the moulding in the case;
5) casting stainless steel or alloy cast iron liquid the time, sandbox is vacuumized synchronously with evacuator, vacuumize and gas purification handle after, discharging;
6) cast finishes, and continues to vacuumize 20-30 minute, with promptly getting the foundry goods blank after the casting mold cooling.
2. the method for claim 1, wherein the 2nd) coating in step consists of: bauxite 35%, and pyrophyllite powder 25%, zircon powder 15%, lithium bentonite 4%, sodium carboxymethylcellulose 2%, n-butanol 0.5%, surplus is a water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103072582A CN102371340A (en) | 2011-10-10 | 2011-10-10 | Lost foam casting method for large casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103072582A CN102371340A (en) | 2011-10-10 | 2011-10-10 | Lost foam casting method for large casting |
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| Publication Number | Publication Date |
|---|---|
| CN102371340A true CN102371340A (en) | 2012-03-14 |
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| CN2011103072582A Pending CN102371340A (en) | 2011-10-10 | 2011-10-10 | Lost foam casting method for large casting |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699278A (en) * | 2012-06-05 | 2012-10-03 | 巢湖市江洋船舶配件有限公司 | Casting technology of boat anchor |
| CN102921500A (en) * | 2012-11-26 | 2013-02-13 | 周作护 | Crushing roller of roller type high-frequency vibration crusher and manufacturing method thereof |
| CN103341592A (en) * | 2013-07-03 | 2013-10-09 | 黄山泰鑫耐磨材料有限公司 | Laminating sand mould vacuum-assist pouring method and system |
| CN103418745A (en) * | 2013-07-12 | 2013-12-04 | 西华大学 | String casting method for filling sand mold lost foams piece by piece (group) |
| CN103506575A (en) * | 2013-03-29 | 2014-01-15 | 洛阳洛北重工机械有限公司 | Casting technique of coal mining machine casting evanescent mould of |
| CN103611876A (en) * | 2013-11-20 | 2014-03-05 | 江苏江旭铸造集团有限公司 | Dry-sand real type negative pressure casting paint |
| CN104624922A (en) * | 2015-01-29 | 2015-05-20 | 石家庄满鼎福铸造有限公司 | Lost foam casting coating for gray cast iron and preparation method of lost foam casting coating |
| CN105397025A (en) * | 2015-11-02 | 2016-03-16 | 长沙金龙铸造实业有限公司 | Nodular cast iron well lid lost foam casting method |
| CN106180541A (en) * | 2016-08-01 | 2016-12-07 | 安徽工程大学机电学院 | A kind of cast steel novel environment friendly coating |
| CN109550890A (en) * | 2017-09-25 | 2019-04-02 | 高淳县龙宁精密铸造有限公司 | Slide evaporative pattern and its method for casting slide |
| CN109550891A (en) * | 2017-09-25 | 2019-04-02 | 高淳县龙宁精密铸造有限公司 | A kind of lathe bed evaporative pattern and its method for pouring lathe bed |
| RU2697204C1 (en) * | 2018-12-21 | 2019-08-13 | федеральное государственное бюджетное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" | Method of application of pyro-carbon coating on cast ceramic molds |
-
2011
- 2011-10-10 CN CN2011103072582A patent/CN102371340A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699278A (en) * | 2012-06-05 | 2012-10-03 | 巢湖市江洋船舶配件有限公司 | Casting technology of boat anchor |
| CN102921500A (en) * | 2012-11-26 | 2013-02-13 | 周作护 | Crushing roller of roller type high-frequency vibration crusher and manufacturing method thereof |
| CN103506575A (en) * | 2013-03-29 | 2014-01-15 | 洛阳洛北重工机械有限公司 | Casting technique of coal mining machine casting evanescent mould of |
| CN103341592A (en) * | 2013-07-03 | 2013-10-09 | 黄山泰鑫耐磨材料有限公司 | Laminating sand mould vacuum-assist pouring method and system |
| CN103418745A (en) * | 2013-07-12 | 2013-12-04 | 西华大学 | String casting method for filling sand mold lost foams piece by piece (group) |
| CN103611876A (en) * | 2013-11-20 | 2014-03-05 | 江苏江旭铸造集团有限公司 | Dry-sand real type negative pressure casting paint |
| CN104624922A (en) * | 2015-01-29 | 2015-05-20 | 石家庄满鼎福铸造有限公司 | Lost foam casting coating for gray cast iron and preparation method of lost foam casting coating |
| CN105397025A (en) * | 2015-11-02 | 2016-03-16 | 长沙金龙铸造实业有限公司 | Nodular cast iron well lid lost foam casting method |
| CN106180541A (en) * | 2016-08-01 | 2016-12-07 | 安徽工程大学机电学院 | A kind of cast steel novel environment friendly coating |
| CN109550890A (en) * | 2017-09-25 | 2019-04-02 | 高淳县龙宁精密铸造有限公司 | Slide evaporative pattern and its method for casting slide |
| CN109550891A (en) * | 2017-09-25 | 2019-04-02 | 高淳县龙宁精密铸造有限公司 | A kind of lathe bed evaporative pattern and its method for pouring lathe bed |
| RU2697204C1 (en) * | 2018-12-21 | 2019-08-13 | федеральное государственное бюджетное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" | Method of application of pyro-carbon coating on cast ceramic molds |
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| C06 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120314 |