CN108941452A - A kind of vacuum negative-pressure los mould casting method - Google Patents
A kind of vacuum negative-pressure los mould casting method Download PDFInfo
- Publication number
- CN108941452A CN108941452A CN201810939491.4A CN201810939491A CN108941452A CN 108941452 A CN108941452 A CN 108941452A CN 201810939491 A CN201810939491 A CN 201810939491A CN 108941452 A CN108941452 A CN 108941452A
- Authority
- CN
- China
- Prior art keywords
- lost foam
- strengthening material
- casting method
- vacuum negative
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The present invention relates to a kind of vacuum negative-pressure los mould casting methods, comprising: manufacture lost foam pattern reinforcing, swabbing, dries, buries case moulding, vacuumizes and negative pressure casting process.Strengthening process is to cut strengthening material according to the shape of lost foam pattern, the edge of the strengthening material is coated using the dedicated bonding cold glue of evaporative pattern, it hangs, then position corresponding with lost foam pattern is bonded together, it is pressed with weight, weight is removed, by strengthening material surfacing and is cleaned out.The setting of strengthening material is effectively increased the intensity of lost foam pattern, and product scope can be produced by extending vacuum negative pressure lost foam technology, and the product produced by this method, scab bad product rate is less than 3%, and crush bad product rate is less than 1.5%.
Description
Technical field
The present invention relates to lost foam castings, in particular to plant the technique side of vacuum negative-pressure los mould casting Sand sticking-resistant, crush
Method.
Background technique
By prefoaming beading, foaming or sheet fabrication form vacuum negative-pressure los mould casting sample in a mold, apperance surface
A kind of method establishing intensity using negative pressure system, being cast is placed in dry sand after being coated with coating.The casting method exists
Two kinds of typical defects of scab and crush.The main reason for causing scab: paint coatings are fallen off or are cracked in molten metal infiltration molding sand
The penetration of formation and coating selection are mismatched with molten metal, again there are when tiny grains of sand dust in dry sand, being formed by
Learn scab.The reason of causing crush: coating's permeability is insufficient, the refractoriness of crush caused by vacuum pump poor inspiration and coating,
Not caused enough the crush of elevated temperature strength.
Solve the defect of scab by increasing coating layer thickness in the prior art, but when coating layer thickness is blocked up, casting mold it is saturating
Gas deficiency will lead to crush defect and dramatically increase.Reduce the probability of crush by reducing coating layer thickness, but coating too it is thin again
Scab can be generated.
Summary of the invention
The defect of scab or crush is overcome the present invention overcomes adjustment coating layer thickness in the prior art, but can not be by two kinds
The problem of defect controls simultaneously provides a kind of vacuum negative-pressure los mould casting method.
A kind of vacuum negative-pressure los mould casting method, comprising:
It manufactures lost foam pattern: lost foam pattern is manufactured according to the technique of product；
Strengthen: strengthening material is cut according to the shape of lost foam pattern；
The edge of the strengthening material is coated using the dedicated bonding cold glue of evaporative pattern, and is hung；
Strengthening material after hanging position corresponding with lost foam pattern is bonded together；
It is pressed using weight, remove weight, and by strengthening material surfacing, cleaning；
Swabbing: selecting corresponding coating, applies to entire model surface；
Drying: the model after brushing is placed in coated and dried kiln, after drying, model is taken out.
It buries case moulding: the model after drying is buried into case moulding.
In order to reduce cost, the strengthening material can according to easy scab, collapse the shape local setting at position or disappearing
Lose mould model surface whole installation.
In order to ensure bond effect, the time hung be -5 minutes 3 minutes, the weight pressed time be greater than etc.
In 8 hours.
In order to ensure the corresponding intensity of lost foam pattern after setting strengthening material, the density of the strengthening material, which is slightly larger than, to disappear
The density of mould model is lost, but is less than ± 5g/dm with the density variation of the lost foam pattern3。
The use of strengthening material cannot influence the gas permeability of lost foam pattern, so the gas permeability of the strengthening material and institute
The ventilative sexual deviation of lost foam pattern is stated less than 10%.
In order to make the region provided with strengthening material with not set strengthening material region with type transition, produced after not influencing casting
The surface quality of product, the strengthening material with a thickness of 2 millimeters -3 millimeters, the excessively thin intensity that will lead to of thickness is inadequate, and thickness is blocked up
It will affect the global shape and precision of model.
The strengthening material can be selected according to the density and gas permeability of lost foam pattern according to mentioned above principle, as preferably
Cardboard is used in lightweight casting.
This method is effectively increased disappearance by the way that partially or fully strengthening material is arranged in surface on lost foam pattern surface
The intensity of mould model, product scope can be produced by effectively extending vacuum negative pressure lost foam technology, the product produced by this method,
Scab bad product rate is less than 3%, and crush bad product rate is less than 1.5%.
Detailed description of the invention
A kind of flow chart of vacuum negative-pressure los mould casting method of Fig. 1
Specific embodiment
In order to make those skilled in the art more fully understand technical solution of the present invention, combined with specific embodiments below to this
Invention is described in further detail.It note that the embodiments described below is exemplary, for explaining only the invention, and
It is not considered as limiting the invention.Particular technique or condition are not specified in embodiment, according to the literature in the art institute
The technology or conditions of description are carried out according to product description.
Casting is produced using a kind of vacuum negative-pressure los mould casting method, is included the following steps: referring to Fig.1
S101: according to product design casting technique, lost foam pattern is manufactured according to casting technique.
S102: strengthening material is cut according to the shape of lost foam pattern；
The edge of the strengthening material is coated using the dedicated bonding cold glue of evaporative pattern, and is hung；
Strengthening material after hanging position corresponding with lost foam pattern is bonded together；
It is pressed using weight, remove weight, and by strengthening material surfacing, cleaning.
S103: selecting coating of the Baume angle value between 58-62, applies to the entire model surface for having pasted strengthening material
It applies, brushes twice, coating layer thickness is between 1.5 millimeters -1.8 millimeters.
S104: the model after brushing is placed in coated and dried kiln, after coating moisture content is down in 1% after drying 12 hours, by mould
Type takes out.
S105: the model after drying is buried into case moulding.
S106: selecting suitable pressure value to vacuumize, and is poured, cooling, finally obtains cast product.
In order to reduce cost, the strengthening material according to easy scab, collapse the shape local setting at position, for that will not go out
Show scab, the position lost foam pattern surface of crush carries out reinforcing step.
The dedicated bonding cold glue of evaporative pattern need to only be smeared in the outer profile edge of strengthening material, both ensure to bond effect in this way
Fruit, and bonding cost is reduced, the dedicated bonding cold glue of evaporative pattern needs to hang 4min after being painted with, then strengthening material is pasted onto evaporative pattern
The corresponding position of model, putting ensures that strengthening material is integrated with lost foam pattern stickup for weight pressed 9 hours.
The used disappearance density of modes of this programme is 22g/dm3, in order to ensure lost foam pattern is corresponding after setting strengthening material
Strength reinforcing material density be slightly larger than lost foam pattern density.
The use of strengthening material cannot influence the gas permeability of lost foam pattern, so the gas permeability of the strengthening material and institute
The ventilative sexual deviation of lost foam pattern is stated less than 10%.
The region and not set strengthening material area with a thickness of 3 millimeters of selection, in this way provided with strengthening material of strengthening material
Domain can not influence the surface quality and precision of product after casting preferably with type transition.
According to mentioned above principle, this programme has selected density for 25 g/dm3Lightweight casting use cardboard, gas permeability satisfaction wants
It asks and is easy to cut, fitting lost foam pattern can be relatively easy to, play the role of preventing scab, crush.
In the description of this specification, embodiment or example particular features, structures, materials, or characteristics described are contained in
In at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms need not be directed to
It is identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be at any one or more
It can be combined in any suitable manner in embodiment or example.In addition, without conflicting with each other, those skilled in the art can be with
The feature of different embodiments or examples described in this specification and different embodiments or examples is combined.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant, at the same time, for those skilled in the art, the think of according to the application
Think, there will be changes in the specific implementation manner and application range.
Claims (8)
1. a kind of vacuum negative-pressure los mould casting method, which is characterized in that the casting method the following steps are included:
It manufactures lost foam pattern: lost foam pattern is manufactured according to the technique of product；
Strengthen: strengthening material is cut according to the shape of lost foam pattern；
The edge of the strengthening material is coated using the dedicated bonding cold glue of evaporative pattern, and is hung；
Strengthening material after hanging position corresponding with lost foam pattern is bonded together；
It is pressed using weight, remove weight, and by strengthening material surfacing, cleaning；
Swabbing: selecting corresponding coating, applies to entire model surface；
Drying: the model after brushing is placed in coated and dried kiln, after drying, model is taken out；
It buries case moulding: the model after drying is buried into case moulding；
Negative pressure casting: selecting suitable pressure value to vacuumize, and is poured, cooling, finally obtains cast product.
2. vacuum negative-pressure los mould casting method according to claim 1, which is characterized in that the strengthening material is set to
Evaporative pattern local location or overall surface.
3. vacuum negative pressure lost foam casting method according to claim 1, which is characterized in that when hanging of the strengthening material
Between be 3 minutes ~ 5 minutes.
4. vacuum negative-pressure los mould casting method according to claim 1, which is characterized in that the weight pressed time
More than or equal to 8 hours.
5. vacuum negative-pressure los mould casting method according to claim 1, which is characterized in that the density of the strengthening material
It is less than ± 5g/dm with the density variation of the lost foam pattern3。
6. vacuum negative-pressure los mould casting method according to claim 1, which is characterized in that the strengthening material is breathed freely
Property with the ventilative sexual deviation of the lost foam pattern less than 10%.
7. vacuum negative-pressure los mould casting method according to claim 1-6, which is characterized in that the Rankine
Material is that cardboard is used in lightweight casting.
8. vacuum negative-pressure los mould casting method according to claim 1-6, which is characterized in that the Rankine
Material with a thickness of 2 millimeters -3 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810939491.4A CN108941452B (en) | 2018-08-17 | 2018-08-17 | Vacuum negative pressure lost foam casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810939491.4A CN108941452B (en) | 2018-08-17 | 2018-08-17 | Vacuum negative pressure lost foam casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108941452A true CN108941452A (en) | 2018-12-07 |
| CN108941452B CN108941452B (en) | 2020-01-14 |
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ID=64470420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810939491.4A Active CN108941452B (en) | 2018-08-17 | 2018-08-17 | Vacuum negative pressure lost foam casting method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201291288Y (en) * | 2008-11-25 | 2009-08-19 | 李德全 | Hollow paper runner channel |
| CN202192214U (en) * | 2011-07-29 | 2012-04-18 | 淅川县银龙汽车配件有限公司 | Figuration lath for lost foam casting foam-plastic mold |
| CN203371000U (en) * | 2013-07-02 | 2014-01-01 | 唐山丞起汽车零部件有限公司 | Evanescent mold iron plate plane fixing frame |
| CN104624960A (en) * | 2013-11-12 | 2015-05-20 | 青岛大运机械有限公司 | Method for preventing deformation of garage kit in lost foam casting process |
| RU171686U1 (en) * | 2017-03-27 | 2017-06-09 | Общество с ограниченной ответственностью Производственная компания "Ходовые системы" | PROFIT MODEL ON THE BASIS OF FOAM POLYSTYRENE FOR CASTING ON GASIFIED MODELS |
-
2018
- 2018-08-17 CN CN201810939491.4A patent/CN108941452B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201291288Y (en) * | 2008-11-25 | 2009-08-19 | 李德全 | Hollow paper runner channel |
| CN202192214U (en) * | 2011-07-29 | 2012-04-18 | 淅川县银龙汽车配件有限公司 | Figuration lath for lost foam casting foam-plastic mold |
| CN203371000U (en) * | 2013-07-02 | 2014-01-01 | 唐山丞起汽车零部件有限公司 | Evanescent mold iron plate plane fixing frame |
| CN104624960A (en) * | 2013-11-12 | 2015-05-20 | 青岛大运机械有限公司 | Method for preventing deformation of garage kit in lost foam casting process |
| RU171686U1 (en) * | 2017-03-27 | 2017-06-09 | Общество с ограниченной ответственностью Производственная компания "Ходовые системы" | PROFIT MODEL ON THE BASIS OF FOAM POLYSTYRENE FOR CASTING ON GASIFIED MODELS |
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| Publication number | Publication date |
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| CN108941452B (en) | 2020-01-14 |
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