CN107755625A - A kind of coating of used in aluminium alloy casting core and external mold, the preparation method of thin-wall aluminum alloy component - Google Patents
A kind of coating of used in aluminium alloy casting core and external mold, the preparation method of thin-wall aluminum alloy component Download PDFInfo
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- CN107755625A CN107755625A CN201711003743.4A CN201711003743A CN107755625A CN 107755625 A CN107755625 A CN 107755625A CN 201711003743 A CN201711003743 A CN 201711003743A CN 107755625 A CN107755625 A CN 107755625A
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Abstract
The present invention relates to the preparation method of the coating of a kind of used in aluminium alloy casting core and external mold, thin-wall aluminum alloy component, belong to Casting Technology field.The coating of the present invention is made up of the component of following parts by weight：5~15 parts of 50~70 parts of graphite, 30~50 parts of ethanol and additive；The additive is made up of rosin and phenolic resin, and the mass ratio of rosin and phenolic resin is 2~4：6~8.The coating of the present invention, the defects of cold shut caused by cast(ing) surface, crackle can be reduced；The surface that resin sand after pouring into a mould is attached to casting can be placed with the hole on potting resin layer of sand surface, reduce the cleaning work amount of casting, shorten the clearance time of casting, improve operating efficiency；The dimensional accuracy of casting can also be improved simultaneously, and reduces surface roughness.In addition, the coating composition of the present invention is simple, it is easy to prepare, the casting cost of aluminium alloy element, remarkable in economical benefits can be reduced.
Description
Technical field
The present invention relates to the preparation method of the coating of a kind of used in aluminium alloy casting core and external mold, thin-wall aluminum alloy component,
Belong to Casting Technology field.
Background technology
Due to aluminium alloy low-density, low cost, the characteristics of better performances, aluminium alloy castings obtains in aerospace field
Extensive use.The characteristics of structure abnormal shape and global formation of adjoint new product, part monoblock cast is increasingly required, and inner chamber is non-
Processing, wall thickness are relatively thin.
Casting industry expands extensive technology to large thin-wall aluminum alloy junction component and manufacture is studied, and traditional design uses
Phenolic sand molding material, the features such as due to sand gas permeability, deformability, granularity, there are various matter in production process
Amount problem, such as crackle, shrinkage porosite, stomata, slag inclusion, deformation.Therefore, when aluminium alloy element is cast, it is necessary in external mold and core
Surface on coat dope layer, aluminium alloy solution can be mitigated to external mold and the friction destruction of core during cast, and be easy to casting
Taken out in autotype.The conventional coating of coating dope layer has talcum powder coating and zinc oxide coating.Both coating are due to Quench speed
The reason for spending slow and coating intensity difference so that the thin-wall aluminum alloy component for casting to obtain has loose shrinkage cavity and surface roughness is high
Problem.
The content of the invention
It is an object of the invention to provide a kind of used in aluminium alloy casting core and the coating of external mold, Thin-walled Aluminum can be significantly reduced
The surface roughness of alloy components, the loose shrinkage cavity tendency of casting is substantially reduced, improve Internal Quality of Cast.
Present invention also offers a kind of preparation method of thin-wall aluminum alloy component.
In order to realize the above object technical scheme used by the used in aluminium alloy casting core of the present invention and the coating of external mold
It is：
A kind of coating of used in aluminium alloy casting core and external mold, is made up of the component of following parts by weight：50~70 parts of graphite,
5~15 parts of 30~50 parts of ethanol and additive；The additive is made up of rosin and phenolic resin, the matter of rosin and phenolic resin
Amount is than being 2~4：6~8.
The used in aluminium alloy casting core of the present invention and the coating of external mold, can reduce cold shut caused by cast(ing) surface, crackle
The defects of；It can place the surface that resin sand after pouring into a mould is attached to casting with the hole on potting resin layer of sand surface, reduce casting
Cleaning work amount, shorten the clearance time of casting, improve operating efficiency；The dimensional accuracy of casting can also be improved simultaneously, and
Reduce surface roughness.In addition, the used in aluminium alloy casting core of the present invention and the coating composition of external mold are simple, it is easy to prepare, energy
Enough reduce the casting cost of aluminium alloy element, remarkable in economical benefits.
Preferably, the coating of described used in aluminium alloy casting core and external mold, is made up of the component of following parts by weight：Graphite
10 parts of 60 parts, 40 parts of ethanol and additive；The mass ratio of the rosin and phenolic resin is 3:7.
The granularity of the graphite is 300~320 mesh.The molecular weight of the phenolic resin is 500~900.
The phenolic resin is liquid phenolic resin.The phenolic resin is that liquified phenol is made through polycondensation reaction by phenol and aldehyde
Urea formaldehyde.
The used in aluminium alloy casting core of the present invention and the coating of external mold can be prepared with the following method：Take formula ratio
Each component, rosin and phenolic resin are added in ethanol and are well mixed, graphite is then added and is well mixed, produce.
Technical scheme is used by the preparation method of the thin-wall aluminum alloy component of the present invention：
A kind of preparation method of thin-wall aluminum alloy component, comprises the following steps：By above-mentioned used in aluminium alloy casting core and outside
The coating of mould is homogeneously applied to the resin sand layer surface of core and external mold, forms the thick coatings of 0.1~0.3mm, and placement dries in the air 1~
2h, then core and external mold are incubated 2~4h under conditions of 120~160 DEG C, mould assembling cast is carried out after cooling.Coating can carry
The dimensional accuracy of high sand-cast, while ensure the gas permeability of layer of sand.Core and external mold are carried out into isothermal holding can remove tree
The gas of absorption, moisture in fat layer of sand, and the volatile ethanol further gone in removing coating, reduce cast-internal stomata,
Shrinkage cavity defect, improve the quality of casting.
The purpose for placing the 1~2h that dries in the air is the ethanol in volatilization coating, obtains the coating of preliminarily dried.
The temperature for pouring into a mould the molten aluminium alloy used is 690~740 DEG C.
For the temperature for being cooled to be cooled to core and external mold no more than 50 DEG C, relatively low casting mold mould assembly pouring temperature is favourable
In increase casting mold Quench speed, Internal Quality of Cast is improved.
The preparation method of the thin-wall aluminum alloy component of the present invention is simple, can significantly improve the inside of thin-wall aluminum alloy component
Quality, it can particularly significantly reduce the surface roughness of thin-wall aluminum alloy component.
Embodiment
Technical scheme is further described below in conjunction with embodiment.
The molten aluminium alloy used in each embodiment is according to GB/T 1173-2013《Cast aluminium alloy gold》Ingredient standard is matched somebody with somebody
The ZL104 of system；Used phenolic resin is the liquid phenolic resin that molecular weight is 500~900.
Embodiment 1
The used in aluminium alloy casting core of the present embodiment and the coating of external mold, are made up of the component of following parts by weight：Graphite 60
10 parts of part, 40 parts of ethanol and additive；Additive is made up of rosin and phenolic resin, and the mass ratio of rosin and phenolic resin is 3：
7；The granularity of graphite is 300 mesh.
The used in aluminium alloy casting core of the present embodiment and the coating of external mold can be prepared with the following method：Take formula
The each component of amount, rosin and phenolic resin are added in ethanol and are well mixed, graphite is then added and is well mixed, produce.
The preparation method of the thin-wall aluminum alloy component of the present embodiment, comprises the following steps：By above-mentioned used in aluminium alloy casting sand
The coating of core and external mold is homogeneously applied to the core of cast and the resin sand layer surface of external mold with thin brush, and it is thick to form 0.1mm
Coating, place 1h coatings it is dry after, then core and external mold be placed in car type furnace stove, 3h be incubated under conditions of 120 DEG C and is gone out
Stove, treat that temperature drops to less than 50 DEG C progress mould assembling cast after coming out of the stove, be then stripped, produce；Molten aluminium alloy during cast
Temperature is 690 DEG C.
What the present embodiment was poured into a mould to obtain is tube-like thin-wall aluminium alloy element, and component upper and lower end face is thick big position, wall thickness≤
4mm, overall dimensions φ >=1000mm, centre are ring muscle and longitudinal rib, every weight about 150kg.
Embodiment 2
The used in aluminium alloy casting core of the present embodiment and the coating of external mold, are made up of the component of following parts by weight：Graphite 50
5 parts of part, 50 parts of ethanol and additive；Additive is made up of rosin and phenolic resin, and the mass ratio of rosin and phenolic resin is 2：
8；The granularity of graphite is 320 mesh.
The used in aluminium alloy casting core of the present embodiment and the coating of external mold can be prepared with the following method：Take formula
The each component of amount, rosin and phenolic resin are added in ethanol and are well mixed, graphite is then added and is well mixed, produce.
The preparation method of the thin-wall aluminum alloy component of the present embodiment, comprises the following steps：By above-mentioned used in aluminium alloy casting sand
The coating of core and external mold is homogeneously applied to the core of cast and the resin sand layer surface of external mold with thin brush, and it is thick to form 0.2mm
Coating, place 2h coatings it is dry after, then core and external mold be placed in car type furnace stove, 2h be incubated under conditions of 160 DEG C and is gone out
Stove, treat that temperature drops to less than 50 DEG C progress mould assembling cast after coming out of the stove, be then stripped, produce；Molten aluminium alloy during cast
Temperature is 710 DEG C.
The obtained thin-wall aluminum alloy component of the present embodiment is the same as embodiment 1.
Embodiment 3
The used in aluminium alloy casting core of the present embodiment and the coating of external mold, are made up of the component of following parts by weight：Graphite 70
15 parts of part, 30 parts of ethanol and additive；The additive is made up of rosin and phenolic resin, the mass ratio of rosin and phenolic resin
For 4：6；The granularity of graphite is 300 mesh.
The used in aluminium alloy casting core of the present embodiment and the coating of external mold can be prepared with the following method：Take formula
The each component of amount, rosin and phenolic resin are added in ethanol and are well mixed, graphite is then added and is well mixed, produce.
The preparation method of the thin-wall aluminum alloy component of the present embodiment, comprises the following steps：By above-mentioned used in aluminium alloy casting sand
The coating of core and external mold is homogeneously applied to the core of cast and the resin sand layer surface of external mold with thin brush, and it is thick to form 0.3mm
Coating, place 1.5h coatings it is dry after, then core and external mold be placed in car type furnace stove, 4h be incubated under conditions of 140 DEG C
Come out of the stove, treat that temperature drops to less than 50 DEG C progress mould assembling cast after coming out of the stove, be then stripped, produce；Molten aluminium alloy during cast
Temperature be 740 DEG C.
The obtained thin-wall aluminum alloy component of the present embodiment is the same as embodiment 1.
Comparative example
The composition of the used in aluminium alloy casting core of comparative example and the coating of external mold is talcum powder, zinc oxide, rosin and phenolic aldehyde
Resin, composition and ratio are 60 parts of talcum powder, 10 parts of zinc oxide, 30 parts of ethanol；The mass ratio of the rosin and phenolic resin is 3:
7。
The preparation method of the thin-wall aluminum alloy component of comparative example, except the used in aluminium alloy casting core of use and the coating of external mold
Outside for the coating of this comparative example, remaining is completely the same as embodiment 1.
Experimental example
1) the thin-wall aluminum alloy component for respectively obtaining embodiment 1~3 and comparative example carries out mechanics properties testing, detection side
Method is with reference to GBT 228-2010《Metal material tensile testing at ambient temperature》.Testing result is shown in Table 1.
The mechanical experimental results of the thin-wall aluminum alloy component of the embodiment 1~3 of table 1 and comparative example
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example |
| Tensile strength/MPa | 280 | 260 | 300 | 220 |
| Elongation percentage/% | 4 | 5 | 6 | 1.5 |
2) surface roughness and basic size of the thin-wall aluminum alloy component of embodiment 1~3 and comparative example, root are measured respectively
The grade of tolerance that component is calculated according to basic size (refers to GB/T6414《The dimensional tolerance of casting and machine-finish allowance》), as a result see
Table 2.
The grade of tolerance and surface roughness of the thin-wall aluminum alloy component of the embodiment 1~3 of table 2 and comparative example
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example |
| The grade of tolerance | CT7 | CT8 | CT7 | CT10 |
| Surface roughness | 6.3 | 6.3 | 6.3 | 12.5 |
3) surface for measuring the thin-wall aluminum alloy component of embodiment 1~3 and comparative example respectively carries out quality fluoroscopic examination, inspection
Survey the results are shown in Table 3.
The surface quality of the thin-wall aluminum alloy component of the embodiment 1~3 of table 3 and comparative example
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example |
| Pinhole rate | I levels | I levels | I levels | III level |
Testing result display member meets GB/T 9438-2013《Aluminium alloy castings》I class castings desire, product surface matter
Amount improves 40%.
4) the carry out x-ray inspection detection of the thin-wall aluminum alloy component of embodiment 1~3 and comparative example, detection are measured respectively
It the results are shown in Table 4.
The internal soundness of the thin-wall aluminum alloy component of the embodiment 1~3 of table 4 and comparative example
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example |
| Shrinkage porosite rank | I levels | I levels | I levels | III level |
As a result show, component inside quality shrinkage porosite rank meets GB/T 9438-2013《Aluminium alloy castings》I class casting will
Ask, the up-to-standard rate of interiors of products improves 30%.
In summary, compared with the component obtained by comparative example, the component of embodiment 1~3 has good mechanical property,
Also there is good surface quality and internal soundness.In addition, the clearance time after casting pouring is compared in embodiment 1~3
1 times is shortened in comparative example, substantially increases production efficiency.
Claims (7)
- A kind of 1. coating of used in aluminium alloy casting core and external mold, it is characterised in that：It is made up of the component of following parts by weight：Graphite 5~15 parts of 50~70 parts, 30~50 parts of ethanol and additive；The additive is made up of rosin and phenolic resin, rosin and phenol The mass ratio of urea formaldehyde is 2~4：6~8.
- 2. the coating of used in aluminium alloy casting core according to claim 1 and external mold, it is characterised in that：By following parts by weight Component composition：10 parts of 60 parts of graphite, 40 parts of ethanol and additive；The mass ratio of the rosin and phenolic resin is 3:7.
- 3. the coating of used in aluminium alloy casting core according to claim 1 or 2 and external mold, it is characterised in that：The graphite Granularity be 300~320 mesh.
- 4. the coating of used in aluminium alloy casting core according to claim 1 or 2 and external mold, it is characterised in that：The phenolic aldehyde Resin is liquid phenolic resin.
- A kind of 5. preparation method of thin-wall aluminum alloy component, it is characterised in that：Comprise the following steps：By described in claim 1 The coating of used in aluminium alloy casting core and external mold is homogeneously applied to the resin sand layer surface of core and external mold, form 0.1~ Coating thick 0.3mm, cool 1~2h is placed, then core and external mold are incubated 2~4h under conditions of 120~160 DEG C, after cooling Carry out mould assembling cast.
- 6. the preparation method of thin-wall aluminum alloy component according to claim 5, it is characterised in that：The aluminium that the cast uses The temperature of alloy molten solution is 690~740 DEG C.
- 7. the preparation method of thin-wall aluminum alloy component according to claim 5, it is characterised in that：It is described to be cooled to be cooled to The temperature of core and external mold is no more than 50 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN112643001A (en) * | 2020-12-21 | 2021-04-13 | 中船重工西安东仪科工集团有限公司 | Core coating brushing process method for improving surface quality of casting |
| CN113941687A (en) * | 2020-07-17 | 2022-01-18 | 中国兵器工业第五九研究所 | Method for enhancing compactness of sand casting |
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| CN113941687A (en) * | 2020-07-17 | 2022-01-18 | 中国兵器工业第五九研究所 | Method for enhancing compactness of sand casting |
| CN112643001A (en) * | 2020-12-21 | 2021-04-13 | 中船重工西安东仪科工集团有限公司 | Core coating brushing process method for improving surface quality of casting |
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