CN108787998A - A kind of lost foam aluminum casting coating and preparation method thereof - Google Patents

A kind of lost foam aluminum casting coating and preparation method thereof Download PDF

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Publication number
CN108787998A
CN108787998A CN201810895386.5A CN201810895386A CN108787998A CN 108787998 A CN108787998 A CN 108787998A CN 201810895386 A CN201810895386 A CN 201810895386A CN 108787998 A CN108787998 A CN 108787998A
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China
Prior art keywords
coating
lost foam
materials
aluminum casting
foam aluminum
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CN201810895386.5A
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Chinese (zh)
Inventor
曹博海
缪强
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Individual
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Individual
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Priority to CN201810895386.5A priority Critical patent/CN108787998A/en
Publication of CN108787998A publication Critical patent/CN108787998A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C3/00Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/02Sand moulds or like moulds for shaped castings
    • B22C9/04Use of lost patterns

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

The invention discloses a kind of lost foam aluminum casting coatings, including below according to the raw material of mass percent:Talcum powder 52-62%, bentonite 1.5-3.5%, recessed soil 0.4-1.2%, yellow starch gum 1.5-2.5%, carboxymethyl cellulose 0.1-0.3%, sodium carbonate 0.02-0.08%, water 31-42%.The invention also discloses the preparation methods of the lost foam aluminum casting coating.Coating prepared by the present invention under the common mating reaction of various raw materials there is good gas permeability, the gas that model gasification generates to be easy, by coating, to improve casting effect;Coating material temperature is moderate, system can use, will not there is a situation where cause bubbles model to deform because of temperature change;Coating preparation is simple, and manufacturing cost is low, is conducive to cost-effective, increases economic efficiency.

Description

A kind of lost foam aluminum casting coating and preparation method thereof
Technical field
The present invention relates to paint field, specifically a kind of lost foam aluminum casting coating and preparation method thereof.
Background technology
Lost foam casting (also known as cavityless casting) is by paraffin similar with casting dimension shape or bubbles model bonding group Synthetic model cluster is embedded in vibration molding in drystone sand, pours into a mould under negative pressure, make model gas after brushing fireproof coating and drying Change, liquid metals occupies modal position, and the novel casting method of casting is formed after solidification is cooling.
Modeling Material used in lost foam casting is usually common drystone sand, and foamed polystyrene pattern is replaced by liquid metal When, thermally decomposing the bulk gas of generation will can be discharged outside casting mold by gap between dry sand.However, work of the liquid metal in negative pressure The gap that is easily penetrated under between dry sand and form penetration.In order to avoid generating penetration, evaporative pattern apperance surface One layer of fireproof coating must be coated with.During casting-up, this layer of fireproof coating be between molten metal and molding sand, it is right Gasification, molten metal filling and the formation etc. of casting of evaporative pattern apperance play a very important role.
Common cast paint only plays blocking buffer action among casting and casting mold, reaches Sand sticking-resistant purpose, but Conventional cast coating gas permeability is poor, because there are the substance that more gas forming amount is big in casting mold, raising rate is fast, and gas is not timely It excludes, easy tos produce stomata.
Invention content
The purpose of the present invention is to provide a kind of lost foam aluminum casting coatings, to solve mentioned above in the background art ask Topic.
To achieve the above object, the present invention provides the following technical solutions:
A kind of lost foam aluminum casting coating, including below according to the raw material of mass percent:Talcum powder 52-62%, bentonite 1.5-3.5%, recessed soil 0.4-1.2%, yellow starch gum 1.5-2.5%, carboxymethyl cellulose 0.1-0.3%, sodium carbonate 0.02- 0.08%, water 31-42%.
As a further solution of the present invention:Including below according to the raw material of mass percent:It is talcum powder 54-58%, swollen Moisten soil 2-3%, recessed soil 0.6-1%, yellow starch gum 1.6-2.3%, carboxymethyl cellulose 0.15-0.25%, sodium carbonate 0.04- 0.06%, water 35-40%.
As further scheme of the invention:Including below according to the raw material of mass percent:Talcum powder 56.67%, Bentonite 2.38%, recessed native 0.8%, yellow starch gum 1.91%, carboxymethyl cellulose 0.19%, sodium carbonate 0.05%, water 38%.
As further scheme of the invention:The specification of the talcum powder is as follows according to mass percent:Below 100 mesh 5%, 100-150 mesh 25%, 150-200 mesh 28%, more than 200 mesh 42%.
The preparation method of the lost foam aluminum casting coating, steps are as follows:
1) it after mixing bentonite, recessed soil, sodium carbonate, stirs evenly, stores 12h, acquisition waits for materials I;
2) wait for that materials are slowly added to after mixing in the water of stirring by what carboxymethyl cellulose and step 1) obtained, water Mixing speed 400-600r/min continues to stir 1h after the completion of charging, and acquisition waits for materials II;
3) talcum powder, yellow starch gum are slowly added to waiting in materials II for stirring after mixing, wait for the stirring speed of materials II Degree is 600-800r/min, continues to stir 1h, discharging after the completion of charging, you can.
Application of the above-mentioned coating in lost foam casting field.
Compared with prior art, the beneficial effects of the invention are as follows:
Coating prepared by the present invention has good gas permeability, model gasification under the common mating reaction of various raw materials The gas of generation is easy, by coating, to improve casting effect;Coating material temperature is moderate, system can use, will not occur because of temperature The case where variation causes bubbles model to deform;Coating preparation is simple, and manufacturing cost is low, is conducive to cost-effective, the economic effect of raising Benefit.
Specific implementation mode
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described, Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all Belong to the scope of protection of the invention.
Embodiment 1
A kind of lost foam aluminum casting coating, including below according to the raw material of mass percent:Talcum powder 52%, bentonite 3.5%, recessed native 0.4%, yellow starch gum 2.5%, carboxymethyl cellulose 0.1%, sodium carbonate 0.08%, water 41.42%.
Wherein, the specification of the talcum powder is as follows according to mass percent:5% below 100 mesh, 100-150 mesh 25%, More than 150-200 mesh 28%, 200 mesh 42%.
In the present embodiment, the preparation method of the lost foam aluminum casting coating, steps are as follows:
1) it after mixing bentonite, recessed soil, sodium carbonate, stirs evenly, stores 12h, acquisition waits for materials I;
2) wait for that materials are slowly added to after mixing in the water of stirring by what carboxymethyl cellulose and step 1) obtained, water Mixing speed 400r/min continues to stir 1h after the completion of charging, and acquisition waits for materials II;
3) talcum powder, yellow starch gum are slowly added to waiting in materials II for stirring after mixing, wait for the stirring speed of materials II Degree is 600r/min, continues to stir 1h, discharging after the completion of charging, you can.
Embodiment 2
A kind of lost foam aluminum casting coating, including below according to the raw material of mass percent:Talcum powder 54%, bentonite 3%, Recessed native 0.6%, yellow starch gum 2.3%, carboxymethyl cellulose 0.15%, sodium carbonate 0.06%, water 39.89%.
Wherein, the specification of the talcum powder is as follows according to mass percent:5% below 100 mesh, 100-150 mesh 25%, More than 150-200 mesh 28%, 200 mesh 42%.
In the present embodiment, the preparation method of the lost foam aluminum casting coating, steps are as follows:
1) it after mixing bentonite, recessed soil, sodium carbonate, stirs evenly, stores 12h, acquisition waits for materials I;
2) wait for that materials are slowly added to after mixing in the water of stirring by what carboxymethyl cellulose and step 1) obtained, water Mixing speed 500r/min continues to stir 1h after the completion of charging, and acquisition waits for materials II;
3) talcum powder, yellow starch gum are slowly added to waiting in materials II for stirring after mixing, wait for the stirring speed of materials II Degree is 700r/min, continues to stir 1h, discharging after the completion of charging, you can.
Embodiment 3
A kind of lost foam aluminum casting coating, including below according to the raw material of mass percent:Talcum powder 56.67%, bentonite 2.38%, recessed native 0.8%, yellow starch gum 1.91%, carboxymethyl cellulose 0.19%, sodium carbonate 0.05%, water 38%.
Wherein, the specification of the talcum powder is as follows according to mass percent:5% below 100 mesh, 100-150 mesh 25%, More than 150-200 mesh 28%, 200 mesh 42%.
In the present embodiment, the preparation method of the lost foam aluminum casting coating, steps are as follows:
1) it after mixing bentonite, recessed soil, sodium carbonate, stirs evenly, stores 12h, acquisition waits for materials I;
2) wait for that materials are slowly added to after mixing in the water of stirring by what carboxymethyl cellulose and step 1) obtained, water Mixing speed 500r/min continues to stir 1h after the completion of charging, and acquisition waits for materials II;
3) talcum powder, yellow starch gum are slowly added to waiting in materials II for stirring after mixing, wait for the stirring speed of materials II Degree is 700r/min, continues to stir 1h, discharging after the completion of charging, you can.
Embodiment 4
A kind of lost foam aluminum casting coating, including below according to the raw material of mass percent:Talcum powder 58%, bentonite 2%, Recessed native 1%, yellow starch gum 1.6%, carboxymethyl cellulose 0.25%, sodium carbonate 0.04%, water 37.11%.
Wherein, the specification of the talcum powder is as follows according to mass percent:5% below 100 mesh, 100-150 mesh 25%, More than 150-200 mesh 28%, 200 mesh 42%.
In the present embodiment, the preparation method of the lost foam aluminum casting coating, steps are as follows:
1) it after mixing bentonite, recessed soil, sodium carbonate, stirs evenly, stores 12h, acquisition waits for materials I;
2) wait for that materials are slowly added to after mixing in the water of stirring by what carboxymethyl cellulose and step 1) obtained, water Mixing speed 500r/min continues to stir 1h after the completion of charging, and acquisition waits for materials II;
3) talcum powder, yellow starch gum are slowly added to waiting in materials II for stirring after mixing, wait for the stirring speed of materials II Degree is 700r/min, continues to stir 1h, discharging after the completion of charging, you can.
Embodiment 5
A kind of lost foam aluminum casting coating, including below according to the raw material of mass percent:Talcum powder 62%, bentonite 1.5%, recessed native 1.2%, yellow starch gum 1.5%, carboxymethyl cellulose 0.3%, sodium carbonate 0.02%, water 31.98%.
Wherein, the specification of the talcum powder is as follows according to mass percent:5% below 100 mesh, 100-150 mesh 25%, More than 150-200 mesh 28%, 200 mesh 42%.
In the present embodiment, the preparation method of the lost foam aluminum casting coating, steps are as follows:
1) it after mixing bentonite, recessed soil, sodium carbonate, stirs evenly, stores 12h, acquisition waits for materials I;
2) wait for that materials are slowly added to after mixing in the water of stirring by what carboxymethyl cellulose and step 1) obtained, water Mixing speed 600r/min continues to stir 1h after the completion of charging, and acquisition waits for materials II;
3) talcum powder, yellow starch gum are slowly added to waiting in materials II for stirring after mixing, wait for the stirring speed of materials II Degree is 800r/min, continues to stir 1h, discharging after the completion of charging, you can.
Coating prepared by embodiment 1-5 is tested for the property, test result is as shown in table 1.
Table 1
From can be seen that the coating of the invention prepared in result above under the common mating reaction of various raw materials, have Good gas permeability, the gas that model gasification generates are easy, by coating, to improve casting effect;Coating pH value is weakly acidic, no Mold or cast member etc. can be corroded so that casting accuracy is higher;Coating density is relatively low, convenient to be coated on bubbles model table Face;Coating material temperature is moderate, system can use, will not there is a situation where cause bubbles model to deform because of temperature change.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiment being appreciated that.

Claims (6)

1. a kind of lost foam aluminum casting coating, which is characterized in that including below according to the raw material of mass percent:Talcum powder 52- 62%, bentonite 1.5-3.5%, recessed soil 0.4-1.2%, yellow starch gum 1.5-2.5%, carboxymethyl cellulose 0.1-0.3%, carbonic acid Sodium 0.02-0.08%, water 31-42%.
2. lost foam aluminum casting coating according to claim 1, which is characterized in that including below according to the original of mass percent Material:Talcum powder 54-58%, bentonite 2-3%, recessed soil 0.6-1%, yellow starch gum 1.6-2.3%, carboxymethyl cellulose 0.15- 0.25%, sodium carbonate 0.04-0.06%, water 35-40%.
3. lost foam aluminum casting coating according to claim 2, which is characterized in that including below according to the original of mass percent Material:Talcum powder 56.67%, bentonite 2.38%, recessed native 0.8%, yellow starch gum 1.91%, carboxymethyl cellulose 0.19%, carbonic acid Sodium 0.05%, water 38%.
4. lost foam aluminum casting coating according to claim 1, which is characterized in that the specification of the talcum powder is according to quality hundred Divide ratio as follows:5% below 100 mesh, more than 100-150 mesh 25%, 150-200 mesh 28%, 200 mesh 42%.
5. a kind of preparation method of lost foam aluminum casting coating as described in claim 1-4 is any, which is characterized in that including following Step:
1) it after mixing bentonite, recessed soil, sodium carbonate, stirs evenly, stores 12h, acquisition waits for materials I;
2) wait for that materials are slowly added to after mixing in the water of stirring by what carboxymethyl cellulose and step 1) obtained, the stirring of water Speed 400-600r/min continues to stir 1h after the completion of charging, and acquisition waits for materials II;
3) talcum powder, yellow starch gum are slowly added to waiting in materials II for stirring after mixing, wait for that the mixing speed of materials II is 600-800r/min continues to stir 1h, discharging after the completion of charging, you can.
6. a kind of application of coating as described in claim 1-4 is any in lost foam casting field.
CN201810895386.5A 2018-08-08 2018-08-08 A kind of lost foam aluminum casting coating and preparation method thereof Withdrawn CN108787998A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201810895386.5A CN108787998A (en) 2018-08-08 2018-08-08 A kind of lost foam aluminum casting coating and preparation method thereof

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111451441A (en) * 2020-04-30 2020-07-28 河南天缘精工模具有限公司 Method for improving surface smoothness of lost foam hollow shell casting

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111451441A (en) * 2020-04-30 2020-07-28 河南天缘精工模具有限公司 Method for improving surface smoothness of lost foam hollow shell casting

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Application publication date: 20181113

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