CN108927489A - A kind of improved method promoting lost foam casting precision - Google Patents
A kind of improved method promoting lost foam casting precision Download PDFInfo
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- CN108927489A CN108927489A CN201810935057.9A CN201810935057A CN108927489A CN 108927489 A CN108927489 A CN 108927489A CN 201810935057 A CN201810935057 A CN 201810935057A CN 108927489 A CN108927489 A CN 108927489A
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- parts
- coating
- lost foam
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- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a kind of improved methods for promoting lost foam casting precision, and one layer of dedicated precision optimizing coating is coated specifically on foam plastics mould surface；The dedicated precision optimizing coating is by following material composition: modified filler, silane coupling agent, polyethylene glycol, sodium pyrophosphate, fatty alcohol polyoxyethylene ether, styrene-acrylic emulsion, vaseline, ethyl acetate, deionized water.The present invention provides a kind of special improvement processing methods, can be obviously improved the qualities such as the surface accuracy of casting, improve its use value, extend the service life of casting, great application value and production and application benefit.
Description
Technical field
The invention belongs to casting technology fields, and in particular to a kind of improved method for promoting lost foam casting precision.
Background technique
Existing many casting are cast using lost-foam casting method, and specific principle and mode are:
Mold is replaced to carry out moulding using foamed polystyrene the modern designs of plastics, apperance is not taken out in solid mold, and molten metal, apperance gas are poured into
Change, to obtain ideal cast, the method uses foam plastics mould, does not have to take out, without type chamber and die joint, production
High-efficient, at low cost, small pollution of the environment.It needs to carry out at coating coating the surface of foam plastics mould before casting
Reason, it is therefore an objective to form a separation layer between foam plastics mould and molding sand mold, reduce the surface that the grains of sand are adhered to cast, just
In molding sand from the sur-face peeling of cast, to promote the quality of cast.Coating not only affects the gas of foam plastics mould
Change and the migration of gas, and with the surface quality of cast, surface defect, cast precision or even cast inherent quality etc.
It is all closely related, and existing multiple coating there is high-temperature resistant properties it is poor, deformability is bad the problems such as, and then affect casting
The quality characteristic of part.
Summary of the invention
The purpose of the present invention is being directed to existing problem, a kind of improved method for promoting lost foam casting precision is provided.
The present invention is achieved by the following technical solutions:
A kind of improved method promoting lost foam casting precision, coats one layer of dedicated essence specifically on foam plastics mould surface
Degree optimization coating；The dedicated precision optimizing coating by following parts by weight material composition: 10 ~ 15 parts of modified fillers, 7 ~ 10
Part silane coupling agent, 8 ~ 12 parts of polyethylene glycol, 4 ~ 7 parts of sodium pyrophosphates, 5 ~ 8 parts of fatty alcohol polyoxyethylene ether, 20 ~ 25 parts of phenylpropyl alcohol creams
Liquid, 3 ~ 6 parts of vaseline, 15 ~ 20 parts of ethyl acetate, 190 ~ 200 parts of deionized waters.
Further, before coating dedicated precision optimizing coating to foam plastics mould surface, first to foam plastics mould
Surface coats one layer of common lost foam casting coating, and the foam plastics mould for being then coated with lost foam casting coating is dried to
The coating of dedicated precision optimizing coating is carried out after surface drying again.
Further, the lost foam casting coating is water based paint.
Further, each ingredient and its corresponding parts by weight in the water based paint are as follows: 10 ~ 15 parts of calcium carbonate, 15 ~ 20 parts
Binder, 6 ~ 10 parts of suspending agents, 1 ~ 3 part of defoaming agent, 0.5 ~ 1.5 portion of preservative, 90 ~ 100 parts of water.
Further, the preparation method of the modified filler includes the following steps:
(1) to weigh following substance by corresponding parts by weight spare: 3 ~ 5 parts of bentonites, 4 ~ 6 parts of attapulgites, 7 ~ 9 parts of sepiolite powders；
(2) the weighed bentonite of step (1), attapulgite, sepiolite powder are put into jointly in calcining furnace and carry out calcination processing,
It is taken out after 1 ~ 2h spare；
(3) step (2) treated bentonite, attapulgite, sepiolite powder is put into jointly in irradiation box and is carried out at irradiation
It manages, is taken out after 50 ~ 55min.
Further, bentonitic grain diameter as described in step (1) is 1600 ~ 1800 mesh, the attapulgite
Grain diameter be 800 ~ 1000 mesh, the grain diameter of the sepiolite powder is 200 ~ 300 mesh.
Further, it is 800 ~ 850 DEG C that the temperature in calcining furnace is controlled when calcination processing described in step (2).
Further, radiation treatment described in step (3) is the processing of He ion irradiation, and the energy for controlling irradiation is
The temperature control of 320 ~ 340keV, irradiation are 480 ~ 500 DEG C, and injection rate is 8 ~ 9 × 1016 cm-2。
Further, the silane coupling agent is silane coupling agent kh550, silane coupling agent kh560, silane coupling agent
Any one in kh570.
The casting property for carrying out coating coating to the surface of the foam plastics mould in evaporative pattern to improve cast member is existing
There is a common or even necessary step in lost-foam casting method, in order to further improve the service performance of coating, most methods are
The ingredient etc. of coating is improved, multiple performance additive is usually additionally added to, although certain improvement effect can be obtained
Fruit, but the excessive of material composition will lead to the not convenient of preparation, preservation etc., and for existing molding shop equipment,
The change of process components can bring the adjustment of producing line equipment, process etc., for the coating largely prepared, nothing
Method carries out secondary operation processing to it, and performance can not enhance, and also just reduces the market competitiveness.Lost foam casting coating is different
Be in place of traditional molding sand: form cast(ing) surface be the coating contacted with apperance inner surface rather than outer surface, so coating
Thickness and current mark will not influence the dimensional accuracy and surface quality of coating, the present invention is exactly the side according to These characteristics to casting
Formula has carried out special processing, and special processing has specifically been carried out to foam plastics mould, in traditional lost foam casting coating
Outer surface carry out being coated with one layer of dedicated precision optimizing coating again, the mechanical characteristic of existing majority lost foam casting coatings is not
It is good, be easily cracked, be damaged, cause moulding snad composition outflow, the problems such as cast member surface accuracy is not high, and the temperature for liquid of casting is higher,
To molding sand can generate expandable pressurized impact, although molding sand itself has certain yielding performance, when coating integral strength it is not high,
When coating organizes binding force difference larger everywhere, the uniformity that molding sand makes a concession cast everywhere will affect, to understand shadow again
Ring its surface quality, dedicated precision optimizing coating a kind of to this formulated of the present invention, by groups such as modified filler, styrene-acrylic emulsions
At, used in modified filler have excellent performance, by bentonite, attapulgite, sepiolite powder compounding be made, first it is carried out
Calcination processing, improves specific surface area and adsorption capacity, has then carried out the processing of He ion irradiation, above-mentioned three after radiation treatment
Produce a large amount of active group on the surface of kind of filler, improve its respond and surface-active, make its in coating
Remaining ingredient preferably fix by compatible combination, and He ion can make when radiation treatment the inside of three kinds of fillers to generate largely
The helium of small particle steeps, and can not only further improve the specific surface area and adsorption capacity of three, also make lamella filler molecule
Loose deformation, increases its interlamellar spacing, enhances its impact resistance, has preferable deformability, when liquid of casting at this time injects
It can preferably buffer thermal shock, and then improve casting quality, additionally the granular size of three kinds of fillers carried out stringent
Collocation is limited, more helps the uniformity of filling dispersion in this way, moreover it is possible to further strengthen dedicated precision optimizing paint film entirety
Shock resistance.Adhesion between the dedicated precision optimizing coating and lost foam casting coating prepared is good, big in conjunction with strength, applies
It covers and solidifies behind the outer surface of lost foam casting coating, form a kind of three-dimensional strengthened coat being cross-linked with each other, improve original and disappear
The uniformity of the whole mechanical strength characteristics and paint coatings of lost pattern casting paint coatings tissue binding strength everywhere guarantees
Its yielding uniformity to cast improves the quality of cast, while disappearing because dedicated precision optimizing coating is coated on
The outer surface of die cast coating reduces the craft precision of coating, is conducive to promote and apply.
The present invention has the advantage that compared with prior art
The present invention provides a kind of special improvement processing methods, can be obviously improved the qualities such as the surface accuracy of casting, mention
Its high use value, extends the service life of casting, great application value and produces and uses benefit.
Specific embodiment
Embodiment 1
A kind of improved method promoting lost foam casting precision, coats one layer of dedicated essence specifically on foam plastics mould surface
Degree optimization coating；The dedicated precision optimizing coating by following parts by weight material composition: 10 parts of modified fillers, 7 parts of silane
Coupling agent, 8 parts of polyethylene glycol, 4 parts of sodium pyrophosphates, 5 parts of fatty alcohol polyoxyethylene ether, 20 parts of styrene-acrylic emulsions, 3 parts of vaseline, 15
Part ethyl acetate, 190 parts of deionized waters.
Further, before coating dedicated precision optimizing coating to foam plastics mould surface, first to foam plastics mould
Surface coats one layer of common lost foam casting coating, and the foam plastics mould for being then coated with lost foam casting coating is dried to
The coating of dedicated precision optimizing coating is carried out after surface drying again.
Further, the lost foam casting coating is water based paint.
Further, each ingredient and its corresponding parts by weight in the water based paint are as follows: 10 parts of calcium carbonate, 15 parts of bondings
Agent, 6 parts of suspending agents, 1 part of defoaming agent, 0.5 portion of preservative, 90 parts of water.
Further, the preparation method of the modified filler includes the following steps:
(1) to weigh following substance by corresponding parts by weight spare: 3 parts of bentonites, 4 parts of attapulgites, 7 parts of sepiolite powders；
(2) the weighed bentonite of step (1), attapulgite, sepiolite powder are put into jointly in calcining furnace and carry out calcination processing,
It is taken out after 1h spare；
(3) step (2) treated bentonite, attapulgite, sepiolite powder is put into jointly in irradiation box and is carried out at irradiation
It manages, is taken out after 50min.
Further, bentonitic grain diameter as described in step (1) is 1600 mesh, the particle of the attapulgite
Partial size is 800 mesh, and the grain diameter of the sepiolite powder is 200 mesh.
Further, it is 800 DEG C that the temperature in calcining furnace is controlled when calcination processing described in step (2).
Further, radiation treatment described in step (3) is the processing of He ion irradiation, and the energy for controlling irradiation is
The temperature control of 320keV, irradiation are 480 DEG C, and injection rate is 8 × 1016 cm-2。
Further, the silane coupling agent is silane coupling agent kh550.
Embodiment 2
A kind of improved method promoting lost foam casting precision, coats one layer of dedicated essence specifically on foam plastics mould surface
Degree optimization coating；The dedicated precision optimizing coating by following parts by weight material composition: 13 parts of modified fillers, 9 parts of silane
Coupling agent, 10 parts of polyethylene glycol, 6 parts of sodium pyrophosphates, 7 parts of fatty alcohol polyoxyethylene ether, 23 parts of styrene-acrylic emulsions, 5 parts of vaseline, 18
Part ethyl acetate, 195 parts of deionized waters.
Further, before coating dedicated precision optimizing coating to foam plastics mould surface, first to foam plastics mould
Surface coats one layer of common lost foam casting coating, and the foam plastics mould for being then coated with lost foam casting coating is dried to
The coating of dedicated precision optimizing coating is carried out after surface drying again.
Further, the lost foam casting coating is water based paint.
Further, each ingredient and its corresponding parts by weight in the water based paint are as follows: 13 parts of calcium carbonate, 18 parts of bondings
Agent, 8 parts of suspending agents, 2 parts of defoaming agents, 1 portion of preservative, 95 parts of water.
Further, the preparation method of the modified filler includes the following steps:
(1) to weigh following substance by corresponding parts by weight spare: 4 parts of bentonites, 5 parts of attapulgites, 8 parts of sepiolite powders；
(2) the weighed bentonite of step (1), attapulgite, sepiolite powder are put into jointly in calcining furnace and carry out calcination processing,
It is taken out after 1.5h spare；
(3) step (2) treated bentonite, attapulgite, sepiolite powder is put into jointly in irradiation box and is carried out at irradiation
It manages, is taken out after 53min.
Further, bentonitic grain diameter as described in step (1) is 1700 mesh, the particle of the attapulgite
Partial size is 900 mesh, and the grain diameter of the sepiolite powder is 250 mesh.
Further, it is 830 DEG C that the temperature in calcining furnace is controlled when calcination processing described in step (2).
Further, radiation treatment described in step (3) is the processing of He ion irradiation, and the energy for controlling irradiation is
The temperature control of 330keV, irradiation are 490 DEG C, and injection rate is 8.5 × 1016 cm-2。
Further, the silane coupling agent is silane coupling agent kh560.
Embodiment 3
A kind of improved method promoting lost foam casting precision, coats one layer of dedicated essence specifically on foam plastics mould surface
Degree optimization coating；The dedicated precision optimizing coating by following parts by weight material composition: 15 parts of modified fillers, 10 parts of silane
Coupling agent, 12 parts of polyethylene glycol, 7 parts of sodium pyrophosphates, 8 parts of fatty alcohol polyoxyethylene ether, 25 parts of styrene-acrylic emulsions, 6 parts of vaseline, 20
Part ethyl acetate, 200 parts of deionized waters.
Further, before coating dedicated precision optimizing coating to foam plastics mould surface, first to foam plastics mould
Surface coats one layer of common lost foam casting coating, and the foam plastics mould for being then coated with lost foam casting coating is dried to
The coating of dedicated precision optimizing coating is carried out after surface drying again.
Further, the lost foam casting coating is water based paint.
Further, each ingredient and its corresponding parts by weight in the water based paint are as follows: 15 parts of calcium carbonate, 20 parts of bondings
Agent, 10 parts of suspending agents, 3 parts of defoaming agents, 1.5 portions of preservatives, 100 parts of water.
Further, the preparation method of the modified filler includes the following steps:
(1) to weigh following substance by corresponding parts by weight spare: 5 parts of bentonites, 6 parts of attapulgites, 9 parts of sepiolite powders；
(2) the weighed bentonite of step (1), attapulgite, sepiolite powder are put into jointly in calcining furnace and carry out calcination processing,
It is taken out after 2h spare；
(3) step (2) treated bentonite, attapulgite, sepiolite powder is put into jointly in irradiation box and is carried out at irradiation
It manages, is taken out after 55min.
Further, bentonitic grain diameter as described in step (1) is 1800 mesh, the particle of the attapulgite
Partial size is 1000 mesh, and the grain diameter of the sepiolite powder is 300 mesh.
Further, it is 850 DEG C that the temperature in calcining furnace is controlled when calcination processing described in step (2).
Further, radiation treatment described in step (3) is the processing of He ion irradiation, and the energy for controlling irradiation is
The temperature control of 340keV, irradiation are 500 DEG C, and injection rate is 9 × 1016 cm-2。
Further, the silane coupling agent is silane coupling agent kh570.
Comparative example 1
This comparative example 1 compared with Example 2, in the preparation of modified filler, eliminates the processing operation of step (3), removes
Furthermore method and step is all the same.
Comparative example 2
This comparative example 2 compared with Example 2, in the preparation of modified filler, controls bentonite, attapulgite, sepiolite
The grain diameter of powder is 1000 mesh, and method and step in addition to this is all the same.
Comparative example 3
This comparative example 3 compared with Example 2, eliminates the modified filler ingredient in dedicated precision optimizing coating, in addition to this
Method and step it is all the same.
In order to compare effect of the present invention, above-described embodiment 2 is carried out respectively to evaporative pattern made from same batch, comparison is implemented
Example 1, comparative example 2, the processing of method described in comparative example 3, then cast according to identical casting process, finally
Attribute test is carried out to the finished product cast of casting, specific correlation data is as shown in table 1 below:
Table 1
The present invention improves the workpiece accuracy that processing method can be obviously improved lost foam casting it can be seen from upper table 1, great
The market competitiveness and application value.
Claims (9)
1. a kind of improved method for promoting lost foam casting precision, which is characterized in that be specifically on foam plastics mould surface
Coat one layer of dedicated precision optimizing coating；The dedicated precision optimizing coating by following parts by weight material composition: 10 ~ 15 parts
Modified filler, 7 ~ 10 parts of silane coupling agents, 8 ~ 12 parts of polyethylene glycol, 4 ~ 7 parts of sodium pyrophosphates, 5 ~ 8 parts of fatty alcohol polyoxyethylene ether,
20 ~ 25 parts of styrene-acrylic emulsions, 3 ~ 6 parts of vaseline, 15 ~ 20 parts of ethyl acetate, 190 ~ 200 parts of deionized waters.
2. a kind of improved method for promoting lost foam casting precision according to claim 1, which is characterized in that foam
Before plastics apperance surface coats dedicated precision optimizing coating, one layer of common molding that disappears first is coated to foam plastics mould surface
Coating is made, the foam plastics mould for being then coated with lost foam casting coating is dried to after surface drying carries out dedicated precision optimizing painting again
The coating of material.
3. a kind of improved method for promoting lost foam casting precision according to claim 2, which is characterized in that described disappears
Lost pattern casting coating is water based paint.
4. a kind of improved method for promoting lost foam casting precision according to claim 3, which is characterized in that the water
Each ingredient and its corresponding parts by weight in base coating are as follows: 10 ~ 15 parts of calcium carbonate, 15 ~ 20 parts of binders, 6 ~ 10 parts of suspending agents, 1 ~ 3 part
Defoaming agent, 0.5 ~ 1.5 portion of preservative, 90 ~ 100 parts of water.
5. a kind of improved method for promoting lost foam casting precision according to claim 1, which is characterized in that the modification
The preparation method of filler includes the following steps:
(1) to weigh following substance by corresponding parts by weight spare: 3 ~ 5 parts of bentonites, 4 ~ 6 parts of attapulgites, 7 ~ 9 parts of sepiolite powders；
(2) the weighed bentonite of step (1), attapulgite, sepiolite powder are put into jointly in calcining furnace and carry out calcination processing,
It is taken out after 1 ~ 2h spare；
(3) step (2) treated bentonite, attapulgite, sepiolite powder is put into jointly in irradiation box and is carried out at irradiation
It manages, is taken out after 50 ~ 55min.
6. a kind of improved method for promoting lost foam casting precision according to claim 5, which is characterized in that step (1)
Described in bentonitic grain diameter be 1600 ~ 1800 mesh, the grain diameter of the attapulgite is 800 ~ 1000 mesh, institute
The grain diameter for the sepiolite powder stated is 200 ~ 300 mesh.
7. a kind of improved method for promoting lost foam casting precision according to claim 5, which is characterized in that step (2)
Described in calcination processing when control calcining furnace in temperature be 800 ~ 850 DEG C.
8. a kind of improved method for promoting lost foam casting precision according to claim 5, which is characterized in that step (3)
Described in radiation treatment be the processing of He ion irradiation, and the energy for controlling irradiation is 320 ~ 340keV, and the temperature of irradiation controls
It is 480 ~ 500 DEG C, injection rate is 8 ~ 9 × 1016 cm-2。
9. a kind of improved method for promoting lost foam casting precision according to claim 1, which is characterized in that the silicon
Alkane coupling agent is silane coupling agent kh550, silane coupling agent kh560, any one in silane coupling agent kh570.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810935057.9A CN108927489B (en) | 2018-08-16 | 2018-08-16 | Improved method for improving lost foam casting manufacturing precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810935057.9A CN108927489B (en) | 2018-08-16 | 2018-08-16 | Improved method for improving lost foam casting manufacturing precision |
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| CN108927489A true CN108927489A (en) | 2018-12-04 |
| CN108927489B CN108927489B (en) | 2020-08-11 |
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| CN201810935057.9A Expired - Fee Related CN108927489B (en) | 2018-08-16 | 2018-08-16 | Improved method for improving lost foam casting manufacturing precision |
Country Status (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109550900A (en) * | 2018-12-18 | 2019-04-02 | 汉中燕航精工机械有限公司 | A kind of casting technique of evaporative pattern |
| CN112007053A (en) * | 2020-09-17 | 2020-12-01 | 广东汇群中药饮片股份有限公司 | Surface treatment method for traditional Chinese medicine wall-broken decoction piece powder |
| CN112899668A (en) * | 2021-01-26 | 2021-06-04 | 温州万虹阀门有限公司 | Surface treatment process for valve body casting part |
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| CN112899668A (en) * | 2021-01-26 | 2021-06-04 | 温州万虹阀门有限公司 | Surface treatment process for valve body casting part |
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| Publication number | Publication date |
|---|---|
| CN108927489B (en) | 2020-08-11 |
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