CN109794580A - A kind of internal combustion engine water pump sand core for casting and preparation method thereof - Google Patents
A kind of internal combustion engine water pump sand core for casting and preparation method thereof Download PDFInfo
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- CN109794580A CN109794580A CN201910219150.4A CN201910219150A CN109794580A CN 109794580 A CN109794580 A CN 109794580A CN 201910219150 A CN201910219150 A CN 201910219150A CN 109794580 A CN109794580 A CN 109794580A
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- sand
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- core
- water pump
- combustion engine
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 40
- 238000005266 casting Methods 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 197
- 239000004576 sand Substances 0.000 claims abstract description 125
- 229920005989 resin Polymers 0.000 claims abstract description 69
- 239000011347 resin Substances 0.000 claims abstract description 69
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 239000007822 coupling agent Substances 0.000 claims abstract description 28
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000003822 epoxy resin Substances 0.000 claims abstract description 12
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 12
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 12
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 11
- 239000005011 phenolic resin Substances 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims description 36
- 238000000576 coating method Methods 0.000 claims description 36
- 238000002156 mixing Methods 0.000 claims description 18
- 238000007711 solidification Methods 0.000 claims description 18
- 230000008023 solidification Effects 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 10
- 230000001680 brushing effect Effects 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 8
- 239000002518 antifoaming agent Substances 0.000 claims description 8
- 229960000892 attapulgite Drugs 0.000 claims description 8
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 8
- 239000004927 clay Substances 0.000 claims description 8
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical group CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 8
- 150000002191 fatty alcohols Chemical class 0.000 claims description 8
- 229910021389 graphene Inorganic materials 0.000 claims description 8
- 229910052863 mullite Inorganic materials 0.000 claims description 8
- 229910052625 palygorskite Inorganic materials 0.000 claims description 8
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 8
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 8
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 8
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 8
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 claims description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerol group Chemical group OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 3
- 150000002168 ethanoic acid esters Chemical class 0.000 claims 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 1
- -1 phenolic aldehyde Chemical class 0.000 claims 1
- URAYPUMNDPQOKB-UHFFFAOYSA-N triacetin Chemical group CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 description 14
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 12
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 7
- 235000013773 glyceryl triacetate Nutrition 0.000 description 7
- 229960002622 triacetin Drugs 0.000 description 7
- 229910052938 sodium sulfate Inorganic materials 0.000 description 6
- 235000011152 sodium sulphate Nutrition 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 4
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000002541 furyl group Chemical group 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a kind of internal combustion engine water pump sand core for casting and preparation method thereof, the sand core is made of the raw material of following weight percent: diatomite 1-4%, magnesia 0.3-1%, resin 1-5%, curing agent 0.5-2% and coupling agent 0.005-0.03%, surplus are roughing sand；The resin is mixed by phenolic resin, polyvinyl resin and epoxy resin by weight 1-3:2-5:0.5-1.5.Gained sand core internal structure even compact of the invention, stabilized structure, tensile strength may be up to 1.93MPa, and the internal combustion engine water pump cast(ing) surface cast is smooth, flawless, and high yield rate is up to 100%.
Description
Technical field
The invention belongs to casting technology fields, and in particular to a kind of internal combustion engine water pump sand core for casting and preparation method thereof.
Background technique
Resin sand refers to that the molding sand or core sand of the binder using artificial synthetic resin as sand grains, resin sand have intensity
It is high, surface is smooth, good permeability and collapsibility are good, can be used for the casting process of internal combustion engine water pump, still, existing internal combustion engine water
Cast temperature is up to 1500-1800 DEG C in pump casting process, and cast temperature is high, but existing internal combustion engine water pump sand core resin
Sand hot deformability is poor, and water pump is also easy to produce crack defect.
The Chinese patent application of Publication No. CN107774880A discloses a kind of fiber reinforced resin sand, for manufacturing casting
Make production casting mold, type core.The resin sand is made of roughing sand, resin, auxiliary agent, fiber, and fiber disperse is in resin or disperse exists
Between sand grains.When the advantages of resin sand includes: same resin dosage, possess mechanical property more better than usual resins sand, it is more suitable
In preparing thin-walled, complexity, accurate core；It is lower to obtain amount of resin required when close mechanical property, resin sand gas forming amount is lower,
Manufacturing cost is lower；When using heat-resisting fiber, type core good in thermal property can more cope with long-time high-temperature service situation.But it should
Compatibility between patent fiber and roughing sand is poor, and metallic solution easily infiltrates into, and cast flush pump gauge face is easily coarse.
Notification number is that the Chinese patent of CN107282870B discloses a kind of preparation method of high-intensitive furan resin-sand, packet
It includes following steps: (1) roughing sand being placed in screening machine and cleaned, be classified, guarantee to approach per a batch of roughing sand size distribution, point
The roughing sand of grade carries out washing process, is dried 20-30min under the conditions of 100-105 DEG C after cleaning；(2) treated
Roughing sand is sent into pressurized tank, is opened agitating device, is sequentially added bonding agent, curing agent, is quickly stirred after 1-5min rapidly
It is forced into 0.15-0.2MPa, pressure maintaining handles release after 1-5min, continues to go out material boxing after being stirred 20-30min, in 30-35
Under the conditions of DEG C it is fully hardened after, wherein roughing sand, bonding agent, curing agent three weight ratio be 1000:(10-50): (5-
10).But containing N, S, P harmful element in the patent furane resins, these elements generate harmful make to gradually surface quality
With, and preparation process is pressurizeed, and it is complicated for operation.
Summary of the invention
To overcome drawbacks described above, the purpose of the present invention is to provide a kind of internal combustion engine water pump sand core for casting and its preparation sides
Method.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of internal combustion engine water pump sand core for casting, is made of the raw material of following weight percent:
Diatomite 1-4%, magnesia 0.3-1%, resin 1-5%, curing agent 0.5-2% and coupling agent 0.005-0.03%, surplus are original
Sand；
The resin is mixed by phenolic resin, polyvinyl resin and epoxy resin by weight 1-3:2-5:0.5-1.5.
Preferably, SiO in the roughing sand2Mass fraction >=90%.
Preferably, SiO in the diatomite2Mass fraction >=90%.
Preferably, the curing agent is glycerol triacetate.
Preferably, the coupling agent is vinyltriethoxysilane.
Preferably, the resin by phenolic resin, polyvinyl resin and epoxy resin by weight 2:3:1 mix and
At.
A kind of preparation method of above-mentioned internal combustion engine water pump sand core for casting, comprising the following steps:
(1) by 50-70% roughing sand and resin mixing 5-10min, coupling agent is then added, continuess to mix 1-3min, is mixed
Sand；
(2) by remaining roughing sand, diatomite and magnesia mixing 1-3min, step (1) mixed sand and curing agent is then added, again
1-3min is mixed, resin sand is obtained；
(3) core box is heated to 160-180 DEG C, penetrates sand 3-5s into core box by penetrating sand mouth, crust solidification 2-4 seconds, vibration is fallen
Shakeout in-core chamber does not have cured resin sand, and the solidification of 100-160s sand core terminates, takes out from core box, core finishing obtains finished sand
Type；
(4) the finished product sand mold external coating fireproof coating obtained by step (3) is put burning coating material, is dried after the completion of burning after the completion of brushing
It is dry to get.
Preferably, fireproof coating described in step (4) is prepared from the following raw materials in parts by weight:
70-80 parts of mullite powder, 10-15 parts of attapulgite clay powder, 0.5-1 parts of graphene oxide, fatty alcohol polyoxyethylene ether 3-8
Part, 5-10 parts of lauryl sodium sulfate, 1-3 parts of sodium carboxymethylcellulose, 0.01-0.03 parts of defoaming agent and 80-120 parts of water.
Preferably, drying temperature described in step (4) is 200-220 DEG C, time 30-60min.
Positive beneficial effect of the invention:
1. resin of the present invention by phenolic resin, polyvinyl resin and epoxy resin by weight 1-3:2-5:0.5-1.5 mix and
At hot deformability is good, and good with the compatibility of roughing sand, and sand core is easy molding, gained sand core internal structure even compact, knot
Structure is firm, and tensile strength may be up to 1.93MPa, and the internal combustion engine water pump cast(ing) surface cast is smooth, and flawless, high yield rate reaches
100%。
2. roughing sand is added the present invention in two steps, a part of roughing sand of the first step is mixed with resin, coupling agent, resin and original
Sand is sufficiently mixed, and full cross-linked between resin, improves the intensity of roughing sand, second step residue roughing sand and diatomite, oxidation
Magnesium mixing, is sufficiently mixed diatomite, magnesia and roughing sand, and last two parts and curing agent remix, and sand core adhesion effect is good,
It is easy molding, is tightly combined, and simple, convenient, quick, is reduced production cost, improve production efficiency.
3. fireproof coating of the present invention is heat-resist, good with finished product sand mold caking property, sand core surface is smooth, further prevents
Sand core is corroded by metallic solution, improves the high temperature tolerance time of sand core.
Specific embodiment
Below with reference to some specific embodiments, the present invention is further described.
Embodiment 1
A kind of internal combustion engine water pump sand core for casting, is made of the raw material of following weight percent:
Diatomite 1%, magnesia 0.3%, resin 3%, curing agent 0.8% and coupling agent 0.009%, surplus are roughing sand；
The resin is mixed by phenolic resin, polyvinyl resin and epoxy resin by weight 1:2:0.5.
SiO in the roughing sand2Mass fraction >=90%.
SiO in the diatomite2Mass fraction >=90%.
The curing agent is glycerol triacetate.
The coupling agent is vinyltriethoxysilane.
A kind of preparation method of above-mentioned internal combustion engine water pump sand core for casting, comprising the following steps:
(1) by 60% roughing sand and resin mixing 8min, coupling agent is then added, continuess to mix 1min, obtains mixed sand；
(2) by remaining roughing sand, diatomite and magnesia mixing 2min, step (1) mixed sand and curing agent is then added, mixes again
1min is closed, resin sand is obtained；
(3) core box is heated to 160 DEG C, penetrates sand 3s into core box by penetrating sand mouth, the in-core of falling shakeout is vibrated in crust solidification 4 seconds
Chamber does not have cured resin sand, and the solidification of 160s sand core terminates, takes out, core finishing from core box, obtain finished product sand mold；
(4) the sand core external coating fireproof coating obtained by step (3) is put burning coating material, is dried after the completion of burning, i.e., after the completion of brushing
?.
Fireproof coating described in step (4) is prepared from the following raw materials in parts by weight:
70 parts of mullite powder, 15 parts of attapulgite clay powder, 0.5 part of graphene oxide, 5 parts of fatty alcohol polyoxyethylene ether, dodecane
5 parts of base sodium sulphate, 1 part of sodium carboxymethylcellulose, 0.01 part of defoaming agent and 100 parts of water.
Drying temperature described in step (4) is 200 DEG C, time 60min.
Embodiment 2
A kind of internal combustion engine water pump sand core for casting, is made of the raw material of following weight percent:
Diatomite 2%, magnesia 0.5%, resin 2%, curing agent 1% and coupling agent 0.01%, surplus are roughing sand；
The resin is mixed by phenolic resin, polyvinyl resin and epoxy resin by weight 3:5:1.5.
SiO in the roughing sand2Mass fraction >=90%.
SiO in the diatomite2Mass fraction >=90%.
The curing agent is glycerol triacetate.
The coupling agent is vinyltriethoxysilane.
A kind of preparation method of above-mentioned internal combustion engine water pump sand core for casting, comprising the following steps:
(1) by 50% roughing sand and resin mixing 6min, coupling agent is then added, continuess to mix 2min, obtains mixed sand；
(2) by remaining roughing sand, diatomite and magnesia mixing 1min, step (1) mixed sand and curing agent is then added, mixes again
3min is closed, resin sand is obtained；
(3) core box is heated to 170 DEG C, penetrates sand 4s into core box by penetrating sand mouth, the in-core of falling shakeout is vibrated in crust solidification 3 seconds
Chamber does not have cured resin sand, and the solidification of 150s sand core terminates, takes out, core finishing from core box, obtain finished product sand mold；
(4) the sand core external coating fireproof coating obtained by step (3) is put burning coating material, is dried after the completion of burning, i.e., after the completion of brushing
?.
Fireproof coating described in step (4) is prepared from the following raw materials in parts by weight:
80 parts of mullite powder, 12 parts of attapulgite clay powder, 0.6 part of graphene oxide, 4 parts of fatty alcohol polyoxyethylene ether, dodecane
6 parts of base sodium sulphate, 1 part of sodium carboxymethylcellulose, 0.01 part of defoaming agent and 80 parts of water.
Drying temperature described in step (4) is 200 DEG C, time 50min.
Embodiment 3
A kind of internal combustion engine water pump sand core for casting, is made of the raw material of following weight percent:
Diatomite 2%, magnesia 0.5%, resin 3%, curing agent 1% and coupling agent 0.01%, surplus are roughing sand；
The resin is mixed by phenolic resin, polyvinyl resin and epoxy resin by weight 2:3:1.
SiO in the roughing sand2Mass fraction >=90%.
SiO in the diatomite2Mass fraction >=90%.
The curing agent is glycerol triacetate.
The coupling agent is vinyltriethoxysilane.
A kind of preparation method of above-mentioned internal combustion engine water pump sand core for casting, comprising the following steps:
(1) by 60% roughing sand and resin mixing 8min, coupling agent is then added, continuess to mix 2min, obtains mixed sand；
(2) by remaining roughing sand, diatomite and magnesia mixing 2min, step (1) mixed sand and curing agent is then added, mixes again
2min is closed, resin sand is obtained；
(3) core box is heated to 170 DEG C, penetrates sand 4s into core box by penetrating sand mouth, the in-core of falling shakeout is vibrated in crust solidification 4 seconds
Chamber does not have cured resin sand, and the solidification of 150s sand core terminates, takes out, core finishing from core box, obtain finished product sand mold；
(4) the sand core external coating fireproof coating obtained by step (3) is put burning coating material, is dried after the completion of burning, i.e., after the completion of brushing
?.
Fireproof coating described in step (4) is prepared from the following raw materials in parts by weight:
75 parts of mullite powder, 12 parts of attapulgite clay powder, 0.8 part of graphene oxide, 5 parts of fatty alcohol polyoxyethylene ether, dodecane
6 parts of base sodium sulphate, 1.5 parts of sodium carboxymethylcellulose, 0.02 part of defoaming agent and 100 parts of water.
Drying temperature described in step (4) is 200 DEG C, time 50min.
Embodiment 4
A kind of internal combustion engine water pump sand core for casting, is made of the raw material of following weight percent:
Diatomite 3%, magnesia 0.6%, resin 1%, curing agent 0.5% and coupling agent 0.005%, surplus are roughing sand；
The resin is mixed by phenolic resin, polyvinyl resin and epoxy resin by weight 2:4:1.
SiO in the roughing sand2Mass fraction >=90%.
SiO in the diatomite2Mass fraction >=90%.
The curing agent is glycerol triacetate.
The coupling agent is vinyltriethoxysilane.
A kind of preparation method of above-mentioned internal combustion engine water pump sand core for casting, comprising the following steps:
(1) by 60% roughing sand and resin mixing 5min, coupling agent is then added, continuess to mix 2min, obtains mixed sand；
(2) by remaining roughing sand, diatomite and magnesia mixing 1min, step (1) mixed sand and curing agent is then added, mixes again
3min is closed, resin sand is obtained；
(3) core box is heated to 170 DEG C, penetrates sand 5s into core box by penetrating sand mouth, the in-core of falling shakeout is vibrated in crust solidification 2 seconds
Chamber does not have cured resin sand, and the solidification of 120s sand core terminates, takes out, core finishing from core box, obtain finished product sand mold；
(4) the sand core external coating fireproof coating obtained by step (3) is put burning coating material, is dried after the completion of burning, i.e., after the completion of brushing
?.
Fireproof coating described in step (4) is prepared from the following raw materials in parts by weight:
75 parts of mullite powder, 12 parts of attapulgite clay powder, 0.8 part of graphene oxide, 6 parts of fatty alcohol polyoxyethylene ether, dodecane
8 parts of base sodium sulphate, 2 parts of sodium carboxymethylcellulose, 0.02 part of defoaming agent and 120 parts of water.
Drying temperature described in step (4) is 220 DEG C, time 30min.
Embodiment 5
A kind of internal combustion engine water pump sand core for casting, is made of the raw material of following weight percent:
Diatomite 3%, magnesia 0.8%, resin 4%, curing agent 1.5% and coupling agent 0.02%, surplus are roughing sand；
The resin is mixed by phenolic resin, polyvinyl resin and epoxy resin by weight 3:4:1.5.
SiO in the roughing sand2Mass fraction >=90%.
SiO in the diatomite2Mass fraction >=90%.
The curing agent is glycerol triacetate.
The coupling agent is vinyltriethoxysilane.
A kind of preparation method of above-mentioned internal combustion engine water pump sand core for casting, comprising the following steps:
(1) by 70% roughing sand and resin mixing 10min, coupling agent is then added, continuess to mix 3min, obtains mixed sand；
(2) by remaining roughing sand, diatomite and magnesia mixing 3min, step (1) mixed sand and curing agent is then added, mixes again
1min is closed, resin sand is obtained；
(3) core box is heated to 160 DEG C, penetrates sand 5s into core box by penetrating sand mouth, the in-core of falling shakeout is vibrated in crust solidification 3 seconds
Chamber does not have cured resin sand, and the solidification of 100s sand core terminates, takes out, core finishing from core box, obtain finished product sand mold；
(4) the sand core external coating fireproof coating obtained by step (3) is put burning coating material, is dried after the completion of burning, i.e., after the completion of brushing
?.
Fireproof coating described in step (4) is prepared from the following raw materials in parts by weight:
80 parts of mullite powder, 10 parts of attapulgite clay powder, 0.8 part of graphene oxide, 8 parts of fatty alcohol polyoxyethylene ether, dodecane
10 parts of base sodium sulphate, 3 parts of sodium carboxymethylcellulose, 0.03 part of defoaming agent and 100 parts of water.
Drying temperature described in step (4) is 220 DEG C, time 40min.
Embodiment 6
A kind of internal combustion engine water pump sand core for casting, is made of the raw material of following weight percent:
Diatomite 4%, magnesia 1%, resin 5%, curing agent 2% and coupling agent 0.03%, surplus are roughing sand；
The resin is mixed by phenolic resin, polyvinyl resin and epoxy resin by weight 2:3:1.
SiO in the roughing sand2Mass fraction >=90%.
SiO in the diatomite2Mass fraction >=90%.
The curing agent is glycerol triacetate.
The coupling agent is vinyltriethoxysilane.
A kind of preparation method of above-mentioned internal combustion engine water pump sand core for casting, comprising the following steps:
(1) by 60% roughing sand and resin mixing 10min, coupling agent is then added, continuess to mix 2min, obtains mixed sand；
(2) by remaining roughing sand, diatomite and magnesia mixing 2min, step (1) mixed sand and curing agent is then added, mixes again
2min is closed, resin sand is obtained；
(3) core box is heated to 180 DEG C, penetrates sand 4s into core box by penetrating sand mouth, the in-core of falling shakeout is vibrated in crust solidification 4 seconds
Chamber does not have cured resin sand, and the solidification of 150s sand core terminates, takes out, core finishing from core box, obtain finished product sand mold；
(4) the sand core external coating fireproof coating obtained by step (3) is put burning coating material, is dried after the completion of burning, i.e., after the completion of brushing
?.
Fireproof coating described in step (4) is prepared from the following raw materials in parts by weight:
70 parts of mullite powder, 15 parts of attapulgite clay powder, 1 part of graphene oxide, 3 parts of fatty alcohol polyoxyethylene ether, dodecyl
9 parts of sodium sulphate, 2.5 parts of sodium carboxymethylcellulose, 0.03 part of defoaming agent and 110 parts of water.
Drying temperature described in step (4) is 210 DEG C, time 50min.
Comparative example 1
The present embodiment and 3 internal combustion engine water pump sand core for casting of embodiment are essentially identical, and the same thing is not repeated, somewhat different
It is:
A kind of internal combustion engine water pump sand core for casting, is made of the raw material of following weight percent:
Diatomite 2%, magnesia 0.5%, resin 3%, curing agent 1% and coupling agent 0.01%, surplus are roughing sand；The resin is
Furane resins.
Comparative example 2
The present embodiment and 3 internal combustion engine water pump sand core for casting of embodiment are essentially identical, and the same thing is not repeated, somewhat different
It is:
A kind of preparation method of internal combustion engine water pump sand core for casting, comprising the following steps:
(1) by resin and coupling agent mixing 2min, roughing sand, diatomite, magnesia and curing agent is then added, continuess to mix
4min obtains resin sand；
(2) core box is heated to 170 DEG C, penetrates sand 4s into core box by penetrating sand mouth, the in-core of falling shakeout is vibrated in crust solidification 4 seconds
Chamber does not have cured resin sand, and the solidification of 150s sand core terminates, takes out, core finishing from core box, obtain finished product sand mold；
(3) the sand core external coating fireproof coating obtained by step (3) is put burning coating material, is dried after the completion of burning, i.e., after the completion of brushing
?.
Sand core prepared by 1-6 of the embodiment of the present invention and comparative example 1-2 carries out tensile strength detection, and for interior
The foundry trial of combustion engine water pump, testing result see the table below 1.
Sand core testing result prepared by table 1 1-6 of the embodiment of the present invention and comparative example 1-2
As shown in Table 1, compared with Example 3, resin replacement is furane resins by comparative example 1, and comparative example 2 will be various
Raw material disposably mixes addition, and sand core tensile strength significantly reduces, and gained water pump surface quality decline, yield rate is remarkably decreased,
Comparative example 1 is particularly evident.
1-6 internal combustion engine water pump sand core for casting tensile strength of the embodiment of the present invention may be up to 1.93MPa, the internal combustion cast
Machine water pump cast(ing) surface is smooth, flawless, and high yield rate is up to 100%.
Claims (9)
1. a kind of internal combustion engine water pump sand core for casting, which is characterized in that be made of the raw material of following weight percent:
Diatomite 1-4%, magnesia 0.3-1%, resin 1-5%, curing agent 0.5-2% and coupling agent 0.005-0.03%, surplus are original
Sand；
The resin is mixed by phenolic resin, polyvinyl resin and epoxy resin by weight 1-3:2-5:0.5-1.5.
2. internal combustion engine water pump sand core for casting according to claim 1, which is characterized in that SiO in the roughing sand2Matter
Measure score >=90%.
3. internal combustion engine water pump sand core for casting according to claim 1, which is characterized in that SiO in the diatomite2's
Mass fraction >=90%.
4. internal combustion engine water pump sand core for casting according to claim 1, which is characterized in that the curing agent is glycerol three
Acetic acid esters.
5. internal combustion engine water pump sand core for casting according to claim 1, which is characterized in that the coupling agent is vinyl
Triethoxysilane.
6. internal combustion engine water pump sand core for casting according to claim 1, which is characterized in that the resin is by phenolic aldehyde tree
Rouge, polyvinyl resin and epoxy resin are mixed by weight 2:3:1.
7. a kind of preparation method of internal combustion engine water pump sand core for casting described in any one of claims 1-6, which is characterized in that packet
Include following steps:
(1) by 50-70% roughing sand and resin mixing 5-10min, coupling agent is then added, continuess to mix 1-3min, is mixed
Sand；
(2) by remaining roughing sand, diatomite and magnesia mixing 1-3min, step (1) mixed sand and curing agent is then added, again
1-3min is mixed, resin sand is obtained；
(3) core box is heated to 160-180 DEG C, penetrates sand 3-5s into core box by penetrating sand mouth, crust solidification 2-4 seconds, vibration is fallen
Shakeout in-core chamber does not have cured resin sand, and the solidification of 100-160s sand core terminates, takes out from core box, core finishing obtains finished sand
Type；
(4) the finished product sand mold external coating fireproof coating obtained by step (3) is put burning coating material, is dried after the completion of burning after the completion of brushing
It is dry to get.
8. the preparation method of internal combustion engine water pump sand core for casting according to claim 7, which is characterized in that step (4) institute
The fireproof coating stated is prepared from the following raw materials in parts by weight:
70-80 parts of mullite powder, 10-15 parts of attapulgite clay powder, 0.5-1 parts of graphene oxide, fatty alcohol polyoxyethylene ether 3-8
Part, 5-10 parts of lauryl sodium sulfate, 1-3 parts of sodium carboxymethylcellulose, 0.01-0.03 parts of defoaming agent and 80-120 parts of water.
9. the preparation method of internal combustion engine water pump sand core for casting according to claim 7, which is characterized in that step (4) institute
The drying temperature stated is 200-220 DEG C, time 30-60min.
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