CN106001421A - Hollow lost foam casting method and pipe feeding device thereof - Google Patents
Hollow lost foam casting method and pipe feeding device thereof Download PDFInfo
- Publication number
- CN106001421A CN106001421A CN201610300517.1A CN201610300517A CN106001421A CN 106001421 A CN106001421 A CN 106001421A CN 201610300517 A CN201610300517 A CN 201610300517A CN 106001421 A CN106001421 A CN 106001421A
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- China
- Prior art keywords
- hollow
- white
- mould
- casting method
- guide rod
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
Abstract
The invention discloses a hollow lost foam casting method and a pipe feeding device thereof. In the stage of preparing a lost foam pattern, supporting pipelines are pre-arranged in a cavity of a foaming mold, the supporting pipelines remain in the mold after bead foaming, and the hollow lost foam pattern provided with through holes inside and with the strength not greatly lowered and even improved is formed; and afterwards, the surface of the hollow lost foam pattern is coated with coating to form a yellow pattern, after being dried, the yellow pattern is placed in a casting box to be vibrated and compacted, and casting is carried out after negative pressure is formed by suction. The process is simple, the cost is low, and the effect is good; and the ventilation in the mold can be remarkably improved, casting defects are eliminated, and the problems of recarburization, inclusions, air pores and the like of castings are avoided.
Description
Technical field
The invention belongs to casting technology field, particularly relate to a kind of hollow lost-foam casting method and down tube device thereof.
Background technology
Lost foam casting (also known as cavityless casting) is that the bubbles model bonding similar to casting dimension shape is combined into model cluster, after brushing fireproof coating and drying, it is embedded in vibration molding in dry sand, pour into a mould under negative pressure, model is made to gasify, liquid metals occupies modal position, forms foundry goods after solidification coolingNovelCasting method.A kind of environmental protection, precision casting process that technique degree of freedom is high.
Being characterized mainly in that of lost foam casting process uses the white mold forming that foams, and without delivery, but is gasified by high-temperature liquid metal and replaces foam Bai Mo position.The white mould of foam be heated after generating gasification and liquefaction process, produce a large amount of gas and certain decomposition liquid, solid residue, these products are easily caused in casting process and there is following problem,Such as figure 2Shown in:
1) cause internal defect in cast, such as pore, be mingled with.
2) carbon defects such as carbon distribution, carbon black, elephant skin are caused at cast(ing) surface.
3) casting process causes and regurgitates.
During realizing the present invention, inventor finds that prior art is to solve the problems referred to above, has developed various different measure, but has had the disadvantage that
1) improve coating's permeability measure: coating's permeability raising is easily caused strength of coating, anti-burnon hydraulic performance decline, improve coating's permeability and take into account strength of coating then to coating requirement height；
2) white mould gas-forming property measure is reduced: though using the materials such as EPMMA, STMMA can reduce white mould gas-forming property, but the more common EPS of price is expensive；
3) technological measure: as controlled poring rate, improve pouring temperature etc., limit technique degree of freedom, and easily cause other problem.
4) slush casting of Bai Mo is burnt: slush casting need to use special Guilin 5 coating, and has the shortcomings such as easy crush.
Summary of the invention
The technical problem to be solved is to provide that a kind of technique is simple, low cost and effect good, venting quality in type can be obviously improved, eliminate casting flaw, it is to avoid foundry goods carburetting, be mingled with, the hollow lost-foam casting method of the problem such as pore and down tube device thereof.
In order to solve above-mentioned technical problem, the technical solution adopted in the present invention is: a kind of hollow lost-foam casting method, preparing foam white mode step section, preset support pipeline in foaming mould die cavity, bead foam completes rear support pipeline and stays in mould, formation includes through hole and intensity does not declines to a great extent, even the hollow white mould promoted；Bai Mo surface swabbing manufacture-yellow mould subsequently, mo(u)ld bottom half vibration ramming after drying, pour into a mould after taking out negative pressure.
Described support pipeline is hollow-core construction.
Bonding core or filter screen is needed to communicate with outer air pressure at the vias of the hollow white mould formed；In the yellow mode step section of follow-up preparation, during hollow Bai Mo surface swabbing, core or filter screen upper surface should not coat coating.
Described support pipeline is high by comprcssive strength, inflammable and the hollow pipe made of the less light-weight high-strength material of combustion residue.
Described support pipe material includes polyethylene, polystyrene PS, polrvinyl chloride, highly dense EPS/XPS/STMMA, synthetic resin.
According to casting structure process requirements, described support pipeline one or both ends are required to be through hole, communicate with outer surface；The locus supporting pipeline includes vertically, level or different spaces angle；Conduit section includes circle, square, the regular geometric shapes of triangle or random geometry.
Depending on hollow parts volume in the white modular space of unit of described support pipeline quantity in foaming mould die cavity-i.e. is according to the through hole spatial density of technological design.Taken through hole spatial density is the biggest, then the number of openings of the same caliber arranged in the white modular space of unit is the most.
Operating procedure is:
1) die sinking, is enclosed within hollow pipe on the guide rod being arranged on white mould foaming mould inner chamber；
2) expanded bead is put in die cavity, matched moulds, carry out foam process；
3) after having foamed, die sinking, guide rod and white mode division from, take out white module.
The down tube device that a kind of above-mentioned hollow lost-foam casting method uses, is provided with guide rod in white mould foaming mould inner chamber relevant position, and described guide rod is suitable with described support pipeline.
Described guide rod has pattern draft；Described guide rod is fixed on the wall of white mould foaming mould inner chamber relevant position/in white mould foaming mould inner chamber relevant position, extended, the guide rod of retraction wall is set.
A technical scheme in technique scheme has the advantage that or beneficial effect,Such as figure 1Shown in, white mould boring pipe communicates with outside negative pressure, and liquid metal filling process internal hollow pipe has aerofluxus, imbibition, slag absorbing effect, and then produces following effect:
1) exhaust gas inside is strengthened.Displacement gas gap layer is relied on the most merely and is exhausted by wall coating, and can go out from the outwards rapid suction of boring pipe.Avoid the white mould of casting process to get angry big aerofluxus to regurgitate not as good as causing, and aerofluxus the most freely produces gas hole defect.
2) decomposed solution, the wall attachment effect of slag that evaporative pattern coating breathing process produces are reduced；Not only can strengthen aerofluxus under boring pipe negative pressure, and have certain liquid collecting, scum riser effect.The elephant skin of foundry goods wall, white carbon black, bonding scab, carburetting can be avoided and the defect such as be mingled with.
3) filling velocity can be improved, reduce molten metal cooling.Owing to the gasifying gas of white mould can be discharged rapidly, thus accelerate molten metal replacement process, improve filling velocity, so fill that molten metal temperature when type completes reduces less.Be conducive to keeping the mold-filling capacity of molten metal, it is to avoid the decline of foundry goods mobility causes the defects such as cold shut.
4) technique degree of freedom increases.Due to aerofluxus, the enhancing of deslagging effect, the permeability of coating is required to reduce by this process, requires to reduce to the gas-forming property of foamed materials.Namely for more common lost foam casting process, the white mould of this FAXIA can use greater density to improve intensity, can use the most cheap low-permeable coating.
5) the process employs the support pipeline that comprcssive strength is high, inflammable and prepared by the less light-weight high-strength material of combustion residue, the hollow white mould performance of formation does not declines because of the existence of through-hole structure, and intensity is good, is unlikely to deform.
This technique is simple, and equipment is easy to use, is not limited by place, energy consumption and low cost, and PROCESS FOR TREATMENT effect is good, small investment, easily industrialized production.
Accompanying drawing explanation
Figure 1The structural representation of the hollow white mould for providing in the embodiment of the present inventionFigure；
Figure 2For common white mode structure air gap layer aerofluxus, imbibition, slag absorbing signalFigure；
Figure 3For white mould hollow-core construction air gap layer aerofluxus, imbibition, slag absorbing signalFigure；
Figure 4Down tube apparatus structure for hollow pipe is illustratedFigure；
Above-mentionedIn figureLabelling be: 1, Bai Mo, 2, hollow pipeline, 3, dope layer, 4, upper through hole, 5, core filter screen, 6, liquefaction film, slag, 7, molten metal, 8, air gap, 9, hollow plastic pipe, 10, location guide, 11, die wall.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction withAccompanying drawingEmbodiment of the present invention is described further in detail.
Embodiment one
A kind of hollow lost-foam casting method, is preparing foam white mode step section, preset support pipeline in foaming mould die cavity, and bead foam completes rear support pipeline and stays in mould, is formed and includes through hole and have the hollow white mould of some strength；Bai Mo surface swabbing manufacture-yellow mould subsequently, mo(u)ld bottom half vibration ramming after drying, pour into a mould after taking out negative pressure.
Support pipeline is hollow-core construction.
Bonding core or filter screen is needed to communicate with outer air pressure at the vias of the hollow white mould formed；In the yellow mode step section of follow-up preparation, during hollow Bai Mo surface swabbing, core or filter screen upper surface should not coat coating.
Supporting pipeline is high by comprcssive strength, inflammable and the hollow pipe made of the less light-weight high-strength material of combustion residue.
Support pipe material and include polyethylene, polystyrene PS, polrvinyl chloride, highly dense EPS/XPS/STMMA, synthetic resin.
According to casting structure process requirements, support pipeline one or both ends and be required to be through hole, communicate with outer surface；The locus supporting pipeline includes vertically, level or different spaces angle；Conduit section includes circle, square, the regular geometric shapes of triangle or random geometry.
Support the hollow parts volume in the white modular space of unit of pipeline quantity in foaming mould die cavity-i.e. according to the through hole spatial density of technological design depending on.
Embodiment two
The down tube device that a kind of above-mentioned hollow lost-foam casting method uses, is provided with guide rod in white mould foaming mould inner chamber relevant position, and guide rod is suitable with support pipeline.
Guide rod has pattern draft；Guide rod is fixed on the wall of white mould foaming mould inner chamber relevant position/in white mould foaming mould inner chamber relevant position, extended, the guide rod of retraction wall is set.
Embodiment three
Enforcement step:
1, according to casting structure, use pvc material to be prepared as the hollow plastic pipe of certain diameter, and be cut into certain length.
2, in evaporative pattern foaming die cavity wall relevant position, metal adhesive glue is used to be adhesively fixed by location guide.Hollow plastic pipe is inserted on location guide,Such as figure 4Shown in middle a part.
3, prefoam, beadlet that ripening is good are put into shaping mold cavity, carry out foaming.
4, after foaming completes, open model, guide rod and white mode division from, take out white module.Bonding core filter screen on the hollow pipeline upper and lower surface through hole of white mould.
5, Bai Mo assembling, bonding, and outer surface be coated with leaching lost foam paint, notice that filter screen upper surface must not coating.Such as figure 1Shown in.Ensure that at pipeline tapping, bonding core filter screen communicates with outer air pressure.
6, yellow mould is thoroughly dried and dries, and buries case vibration ramming.
7, take out negative pressure, and keep negative pressure at cast cavity filling process.Lost pressure cooling is removed after solidification certain time.
Embodiment four
Enforcement step:
1, according to casting structure, use polythene material to be prepared as the hollow plastic pipe of certain diameter, and be cut into certain length.
2, in evaporative pattern foaming die cavity wall relevant position, extended, the guide rod of retraction wall is set.Guide rod has certain pattern draft, in order to guide rod separates with hollow pipe.Such as figure 4Shown in middle b part.
3, guide rod is stretched out wall, hollow plastic pipe is inserted on location guide.Prefoam, beadlet that ripening is good are put into shaping mold cavity, carries out foaming.
4, after foaming completes, guide rod retraction wall.Open model, guide rod and white mode division from, take out white module.Bonded ceramics filter screen on left and right, the hollow pipeline surface through hole of white mould.
5, Bai Mo assembling, bonding, and outer surface be coated with leaching lost foam paint, notice that filter screen upper surface must not coating.Such as figure 1Shown in.Ensure that at pipeline tapping, bonding core filter screen communicates with outer air pressure.
6, yellow mould is thoroughly dried and dries, and buries case vibration ramming.
7, take out negative pressure, and keep negative pressure at cast cavity filling process.Lost pressure cooling is removed after solidification certain time.
After using above-mentioned scheme, white mould boring pipe communicates with outside negative pressure, and liquid metal filling process internal hollow pipe has aerofluxus, imbibition, slag absorbing effect,Such as figure 3Shown in, and then produce following effect:
1) exhaust gas inside is strengthened.Displacement gas gap layer is relied on the most merely and is exhausted by wall coating, and can go out from the outwards rapid suction of boring pipe.Avoid the white mould of casting process to get angry big aerofluxus to regurgitate not as good as causing, and aerofluxus the most freely produces gas hole defect.
2) decomposed solution, the wall attachment effect of slag that evaporative pattern coating breathing process produces are reduced；Not only can strengthen aerofluxus under boring pipe negative pressure, and have certain liquid collecting, scum riser effect.The elephant skin of foundry goods wall, white carbon black, bonding scab, carburetting can be avoided and the defect such as be mingled with.
3) filling velocity can be improved, reduce molten metal cooling.Owing to the gasifying gas of white mould can be discharged rapidly, thus accelerate molten metal replacement process, improve filling velocity, so fill that molten metal temperature when type completes reduces less.Be conducive to keeping the mold-filling capacity of molten metal, it is to avoid the decline of foundry goods mobility causes the defects such as cold shut.
4) technique degree of freedom increases.Due to aerofluxus, the enhancing of deslagging effect, the permeability of coating is required to reduce by this process, requires to reduce to the gas-forming property of foamed materials.Namely for more common lost foam casting process, the white mould of this FAXIA can use greater density to improve intensity, can use the most cheap low-permeable coating.
This technique is simple, and equipment is easy to use, is not limited by place, energy consumption and low cost, and PROCESS FOR TREATMENT effect is good, small investment, easily industrialized production.
Above in conjunction withAccompanying drawingThe present invention is exemplarily described; obviously the present invention implements and is not subject to the restrictions described above; if the improvement of the various unsubstantialities that the method design that have employed the present invention is carried out with technical scheme; or the most improved design by the present invention and technical scheme directly apply to other occasion, all within protection scope of the present invention.
Claims (10)
1. a hollow lost-foam casting method, it is characterised in that preparing foam white mode step section, in foaming
Preset support pipeline in mold cavity, bead foam completes rear support pipeline and stays in mould, is formed and includes through hole
Hollow white mould；Bai Mo surface swabbing manufacture-yellow mould subsequently, mo(u)ld bottom half vibration ramming after drying, waters after taking out negative pressure
Note.
2. hollow lost-foam casting method as claimed in claim 1, it is characterised in that described support pipeline
For hollow-core construction.
3. hollow lost-foam casting method as claimed in claim 1 or 2, it is characterised in that the sky of formation
Bonding core or filter screen is needed to communicate with outer air pressure at the vias of core white mould；In the yellow mode step section of follow-up preparation,
During hollow Bai Mo surface swabbing, core or filter screen upper surface should not coat coating.
4. hollow lost-foam casting method as claimed in claim 1 or 2, it is characterised in that described support
Pipeline is high by comprcssive strength, inflammable and the hollow pipe made of the less light-weight high-strength material of combustion residue.
5. hollow lost-foam casting method as claimed in claim 4, it is characterised in that described support pipeline
Material includes polyethylene, polystyrene PS, polrvinyl chloride, highly dense EPS/XPS/STMMA, synthetic resin.
6. hollow lost-foam casting method as claimed in claim 1 or 2, it is characterised in that tie according to foundry goods
Structure process requirements, described support pipeline one or both ends are required to be through hole, communicate with outer surface；Support pipeline
Locus includes vertically, level or different spaces angle；Conduit section includes circle, square, triangle
Regular geometric shapes or random geometry.
7. hollow lost-foam casting method as claimed in claim 1 or 2, it is characterised in that described support
Hollow parts volume in the white modular space of unit of pipeline quantity in foaming mould die cavity-i.e. is according to technological design
Through hole spatial density depending on.
8. hollow lost-foam casting method as claimed in claim 2, it is characterised in that operating procedure is:
1) die sinking, is enclosed within hollow pipe on the guide rod being arranged on white mould foaming mould inner chamber；
2) expanded bead is put in die cavity, matched moulds, carry out foam process；
3) after having foamed, die sinking, guide rod and white mode division from, take out white module.
9. the down tube device that the hollow lost-foam casting method as described in right 1-8 is arbitrary uses, its feature
Being, being provided with guide rod in white mould foaming mould inner chamber relevant position, described guide rod is fitted mutually with described support pipeline
Join.
10. down tube device as claimed in claim 9, it is characterised in that described guide rod has pattern draft；
Described guide rod is fixed on the wall of white mould foaming mould inner chamber relevant position/in white mould foaming mould inner chamber corresponding positions
Install extended, the guide rod of retraction wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610300517.1A CN106001421A (en) | 2016-05-09 | 2016-05-09 | Hollow lost foam casting method and pipe feeding device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610300517.1A CN106001421A (en) | 2016-05-09 | 2016-05-09 | Hollow lost foam casting method and pipe feeding device thereof |
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| CN106001421A true CN106001421A (en) | 2016-10-12 |
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| CN201610300517.1A Pending CN106001421A (en) | 2016-05-09 | 2016-05-09 | Hollow lost foam casting method and pipe feeding device thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107282880A (en) * | 2017-08-22 | 2017-10-24 | 金华万里扬机械制造有限公司 | Cast model |
| CN108436032A (en) * | 2018-05-24 | 2018-08-24 | 河北省同创交通工程配套产品产业技术研究院 | A kind of hollow evaporative pattern and preparation method thereof |
| CN108543935A (en) * | 2018-04-12 | 2018-09-18 | 北京科技大学 | A kind of method that 3D printing combination lost foam prepares Metal Substrate SHS wear-resistant coatings |
| CN109909449A (en) * | 2019-04-19 | 2019-06-21 | 陈忠响 | A kind of disappearance mould production method of cylinder sleeve of engine |
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| CN107282880A (en) * | 2017-08-22 | 2017-10-24 | 金华万里扬机械制造有限公司 | Cast model |
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| CN109909449A (en) * | 2019-04-19 | 2019-06-21 | 陈忠响 | A kind of disappearance mould production method of cylinder sleeve of engine |
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Application publication date: 20161012 |