CN114918363A - Thin-wall sand core for automobile cylinder body and preparation method - Google Patents
Thin-wall sand core for automobile cylinder body and preparation method Download PDFInfo
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- CN114918363A CN114918363A CN202210606353.0A CN202210606353A CN114918363A CN 114918363 A CN114918363 A CN 114918363A CN 202210606353 A CN202210606353 A CN 202210606353A CN 114918363 A CN114918363 A CN 114918363A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000005245 sintering Methods 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 139
- 239000004576 sand Substances 0.000 claims description 76
- 239000005011 phenolic resin Substances 0.000 claims description 33
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 32
- 229920001568 phenolic resin Polymers 0.000 claims description 32
- 239000005056 polyisocyanate Substances 0.000 claims description 30
- 229920001228 polyisocyanate Polymers 0.000 claims description 30
- 239000006004 Quartz sand Substances 0.000 claims description 27
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 21
- 150000001412 amines Chemical class 0.000 claims description 15
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 9
- WDPYDDUVWLUIDM-UHFFFAOYSA-N ethyl carbamate;phenol Chemical compound CCOC(N)=O.OC1=CC=CC=C1 WDPYDDUVWLUIDM-UHFFFAOYSA-N 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 239000004927 clay Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract description 8
- 210000003462 vein Anatomy 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000010437 gem Substances 0.000 description 4
- 229910001751 gemstone Inorganic materials 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052845 zircon Inorganic materials 0.000 description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2246—Condensation polymers of aldehydes and ketones
- B22C1/2253—Condensation polymers of aldehydes and ketones with phenols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2273—Polyurethanes; Polyisocyanates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
- B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mold Materials And Core Materials (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses a thin-wall sand core for an automobile cylinder body, which has the advantages of few types of core making materials, stable quality of the sand core, low gas generation of the sand core, proper air permeability, excellent high-temperature resistance, good thermal stability and high dimensional precision of a casting; the method for preparing the thin-wall sand core for the automobile cylinder body has the advantages that the reasonable selection and preparation of the types of core making materials, the correct selection of material performance indexes and particle size distribution, the control of the material mixing process and the core making process parameters, the core making formability is good, the yield is higher than 96%, the minimum wall thickness of the water jacket core is 3mm, the inner cavity of the water jacket of the cylinder body is clean, the defects of vein, sintering and the like are avoided, the core making efficiency is high, and the comprehensive core making cost is low.
Description
Technical Field
The invention relates to the technical field of engine part casting, in particular to a thin-wall sand core for an automobile cylinder body and a preparation method thereof.
Background
In the equipment manufacturing industry, casting is the basis of the national manufacturing industry, and castings are widely applied and are core components of the equipment manufacturing industry. With the continuous development of the casting industry, the customer demand is continuously improved, and the requirements on the overall stability, durability and economy of the engine are higher and higher. Along with the increasingly strict requirements on environmental protection, automobiles are developed to be light, the requirements on the wall thickness of an automobile engine cylinder body are higher and higher, the quality of an inner cavity is higher and higher, the inner cavity of a cylinder water jacket is used as the circulation position of engine cooling water, the quality of the inner cavity plays a vital role in the heat dissipation effect of the engine, the temperature of molten iron poured into the cylinder body is high, the position structure of the water jacket is complex, the wall is thin, and the inner cavity often has the defects of veins, sintering and the like, so that the requirements on the performances of the sand core such as high-temperature deformation and expansion resistance, thermal stability, formability, surface quality and the like are improved. Meanwhile, with the rising of the price of the original auxiliary materials, the operating pressure of the foundry is increased, and the operation can be controlled by measures such as core making materials, core making qualified rate, core making efficiency optimization and the like.
Document 1: discloses a casting process of an oil duct core of an engine cylinder body, which comprises the following steps: putting the gem sand and the raw sand into a sand mixer for mixing according to the weight ratio of 64-80:20-36, adding a binder into the sand mixer for mixing within 15-20s, wherein the binder accounts for 1.5-2.0% of the total weight of the gem sand and the raw sand, and putting the binder into a core shooter head for standby; closing the sand core mold; the core shooting machine is used for shooting sand and core making, the sand shooting pressure is 3-8bar, the sand shooting time is 2-6s, triethylamine is blown in for solidification, a box is taken out for coring, the sand core is cleaned by compressed air to remove floating sand, and the oil duct core of the engine cylinder body is obtained.
The sintering of the inner cavity of the cylinder body of the automobile engine and the vein can influence the performance of the cylinder body engine and the comprehensive cost and efficiency of core making. At present, in order to avoid the defects of vein lines or sintering of an inner cavity and the like, some additive materials such as iron oxide, aluminosilicate, cellulose and the like are often added into the thin-wall sand core for casting the automobile engine cylinder body, but the gas generation of the sand core is increased, the core making efficiency is reduced, and more negative effects are brought; or the quality of the inner cavity of the cylinder body is improved by using the jewel sand, the chromite sand or the zircon sand according to a certain proportion, but the jewel sand has high cost and high density, and the resources of the chromite sand and the zircon sand are few, so that the cost is high.
Disclosure of Invention
The invention relates to a thin-wall sand core for an automobile cylinder body and a preparation method thereof, aiming at the problems in the prior art, the invention creatively designs the thin-wall sand core for the automobile cylinder body and the preparation method thereof, and the core-making formability is good and the size precision of a casting is high by reasonably selecting and preparing the types of core-making materials, correctly selecting the performance indexes and the particle size distribution of the materials, controlling the material mixing process and the core-making process parameters.
One of the technical schemes for realizing the invention is as follows: the thin-wall sand core for the automobile cylinder body is characterized by comprising the following components: synthetic sand, quartz sand, and phenol urethane resin.
The optimized scheme of the thin-wall sand core for the automobile cylinder body is prepared from the following raw materials, by weight, 45-55 parts of artificial sand, 45-55 parts of quartz sand and 1-3 parts of phenol urethane resin.
Further, the phenolic urethane resin is phenolic resin and polyisocyanate.
The optimized scheme of the thin-wall sand core for the automobile cylinder body is prepared from the following raw materials, by weight, 50 parts of artificial sand, 50 parts of quartz sand, 0.935 part of phenolic resin and 0.765 part of polyisocyanate.
Further, the artificial sand comprises Al 2 O 3 ％≥43at.％，SiO 2 ％≤52at.％，Fe 2 O 3 The percentage is less than or equal to 4 at.%, and the other percentage is less than or equal to 3 at.%; the characteristic parameter of the artificial sand is that the bulk density is 1.4-1.7g/cm 3 Angular coefficient is less than or equal to 1.1, thermal expansion rate (1000 ℃) is less than or equal to 0.2%, refractoriness is more than or equal to 1760 ℃, ignition loss is less than or equal to 0.2%, and acid consumption valueNot more than 5mL/50g, the water content is not more than 0.25%, the granularity is not less than 80 wt% in 40+50+70 meshes, the weight of a 40/50/70-mesh single sieve is not more than 18-38 wt%, the weight of 30 meshes and above is not more than 22%, the weight of 100 meshes and below is not more than 10 wt%, and the weight of 140 meshes and below is not more than 1 wt%.
Further, the quartz sand comprises the following parameters of SiO 2 ％≥91at.％，Fe 2 O 3 The percentage is less than or equal to 0.7 at.%, the mud content is less than or equal to 0.20 wt.%; the quartz sand is characterized by the conductivity being less than or equal to 100uS/cm, the acid consumption value being less than or equal to 5mL/50g, the ignition loss being less than or equal to 0.3 wt.%, the granularity being 50+70+100 meshes being more than or equal to 80 wt.%, the 50/70/100 meshes being less than or equal to 48 wt.%, the granularity being 140 meshes and less than or equal to 3 wt.%, and the granularity being 40 meshes and more than or equal to 10 wt.%.
Further, the phenolic resin has a density of 1.02-1.15g/cm at 20 ℃ and characteristic parameters 3 The viscosity is less than or equal to 30s at 25 ℃; the polyisocyanate component and the characteristic parameters are that the density is 1.05-1.22g/cm at 20 DEG C 3 And the viscosity is less than or equal to 20s at 25 ℃.
The second scheme for realizing the invention is as follows: a preparation method of a thin-wall sand core for an automobile cylinder body is characterized by comprising the following steps:
1) selecting materials: selecting 50 parts of artificial sand, 50 parts of quartz sand, 0.935 part of phenolic resin and 0.765 part of polyisocyanate according to the parts by weight, wherein the temperature of the artificial sand, the quartz sand, the phenolic resin and the polyisocyanate is 25-35 ℃;
2) mixing materials: starting a sand mixer, wherein the sand mixer is vertical to a central shaft, the rotating speed of the sand mixer is 90-100 r/min, artificial sand and quartz sand are simultaneously added into the sand mixer, when 3/4 is added into the artificial sand and the quartz sand, phenolic resin is started to be added, the interval between the phenolic resin and a polyisocyanate addition port is 200-300mm, the distance between the phenolic resin and the polyisocyanate addition port and the central rotating shaft of the sand mixer is 150-200mm, after 2-4 seconds of phenolic resin is added, polyisocyanate is added, the adding time of the phenolic resin and the polyisocyanate is 5-15 seconds, and after the simultaneous addition of the phenolic resin and the polyisocyanate is completed, the timing is started for 40 seconds;
3) preparing a sand core: curing by using triethylamine, wherein the amine blowing time is 7.0 +/-1 s, the initial amine blowing pressure is 0.2 +/-0.1 bar, the amine blowing finishing pressure is 4.0 +/-1.0 bar, the amine addition amount is 1.13g of amine per kilogram of sand, the curing time is 25 +/-5 s, and the triethylamine heating temperature is 100-; the sand shooting pressure is 4.0 +/-0.5 bar, and the sand shooting time is 3 +/-0.5 s.
In the step 1), the artificial sand is formed by calcining flint clay at high temperature, pulverizing and sintering, and the composition parameters of the artificial sand are Al 2 O 3 ％≥43at.％，SiO 2 ％≤52at.％，Fe 2 O 3 The percentage is less than or equal to 4 at.%, and the other percentage is less than or equal to 3 at.%; the characteristic parameter of the artificial sand is that the bulk density is 1.4-1.7g/cm 3 The angular coefficient is less than or equal to 1.1, the thermal expansion rate (1000 ℃) is less than or equal to 0.2%, the refractoriness is more than or equal to 1760 ℃, the ignition loss is less than or equal to 0.2%, the acid consumption value is less than or equal to 5mL/50g, the water content is less than or equal to 0.25%, the granularity is 40+50+70 meshes and more than or equal to 80 wt%, the single sieve of 40/50/70 meshes is less than or equal to 18-38 wt%, the number of 30 meshes and more than or equal to 22%, the number of 100 meshes and less than or equal to 10 wt%, and the number of 140 meshes and less than or equal to 1 wt%.
In step 2), the addition time of the phenolic resin and the polyisocyanate is 10 seconds.
The thin-wall sand core for the automobile cylinder body and the preparation method have the beneficial effects that:
1. the thin-wall sand core for the automobile cylinder body has excellent high-temperature resistance and good thermal stability, the weight of molten iron poured in each mold is 105kg, the pouring temperature is 1425-;
2. a method for preparing a thin-wall sand core for an automobile cylinder body comprises the steps of reasonably selecting and preparing core-making materials, correctly selecting material performance indexes and particle size distribution, controlling material mixing and making processes and core-making process parameters, and having the advantages of good core-making formability, high qualified rate higher than 96%, high core-making efficiency and low core-making comprehensive cost.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the scope of the invention as claimed is not limited to the following embodiments.
Example 1:
the thin-wall sand core for the automobile cylinder body is prepared from the following raw materials, by weight, 45 parts of artificial sand, 45 parts of quartz sand and 1 part of phenol urethane resin.
Example 2:
the thin-wall sand core for the automobile cylinder body is prepared from the following raw materials, by weight, 45 parts of artificial sand, 45 parts of quartz sand and 3 parts of phenol urethane resin.
Example 3:
the thin-wall sand core for the automobile cylinder body is prepared from 55 parts of artificial sand, 55 parts of quartz sand and 3 parts of phenol urethane resin by weight.
Example 4:
the thin-wall sand core for the automobile cylinder body is prepared from 55 parts of artificial sand, 55 parts of quartz sand and 1 part of phenol urethane resin by weight.
Example 4:
the thin-wall sand core for the automobile cylinder body is prepared from 50 parts by weight of artificial sand, 50 parts by weight of quartz sand, 0.935 part by weight of phenolic resin and 0.765 part by weight of polyisocyanate.
Example 5:
the preparation method of the thin-wall sand core for the automobile cylinder body comprises the following steps:
1) selecting materials: selecting 50 parts of artificial sand, 50 parts of quartz sand, 0.935 part of phenolic resin and 0.765 part of polyisocyanate according to the parts by weight, wherein the temperature of the artificial sand, the quartz sand, the phenolic resin and the polyisocyanate is 25-35 ℃;
2) mixing materials: starting a sand mixer, wherein the central axis of the sand mixer is vertical, the rotating speed of the sand mixer is 90-100 r/min, artificial sand and quartz sand are added into the sand mixer, when 3/4 is added into the artificial sand and the quartz sand, phenolic resin is added, the interval between phenolic resin and polyisocyanate addition ports is 200-300mm, the distance between the phenolic resin and polyisocyanate addition ports is 150-200mm away from the central rotating shaft of the sand mixer, after 2-4 seconds of phenolic resin addition, polyisocyanate is added, the adding time of the phenolic resin and the polyisocyanate is 5-15 seconds, and after the simultaneous addition of the phenolic resin and the polyisocyanate is finished, the timing is started for 40 seconds;
3) preparing a sand core: curing by using triethylamine, wherein the amine blowing time is 7.0 +/-1 s, the initial amine blowing pressure is 0.2 +/-0.1 bar, the amine blowing finishing pressure is 4.0 +/-1.0 bar, the amine addition amount is 1.13g of amine per kilogram of sand, the curing time is 25 +/-5 s, and the triethylamine heating temperature is 100-; the sand shooting pressure is 4.0 +/-0.5 bar, and the sand shooting time is 3 +/-0.5 s.
The method for preparing the thin-wall sand core for the automobile cylinder body as claimed in claim 8, wherein the artificial sand is prepared by high-temperature calcination of flint clay, pulverization and sintering, and the composition parameter of the artificial sand is Al 2 O 3 ％≥43at.％，SiO 2 ％≤52at.％，Fe 2 O 3 The percentage is less than or equal to 4 at.%, and the other percentage is less than or equal to 3 at.%; the characteristic parameter of the artificial sand is that the bulk density is 1.4-1.7g/cm 3 The angular coefficient is less than or equal to 1.1, the thermal expansion rate (1000 ℃) is less than or equal to 0.2%, the refractoriness is more than or equal to 1760 ℃, the ignition loss is less than or equal to 0.2%, the acid consumption value is less than or equal to 5mL/50g, the water content is less than or equal to 0.25%, the granularity of 40+50+70 meshes is more than or equal to 80 wt.%, the single sieve of 40/50/70 meshes is less than or equal to 18-38 wt.%, the granularity of 30 meshes and more than or equal to 22%, the granularity of 100 meshes and less than or equal to 10 wt.%, and the granularity of 140 meshes and less than or equal to 1 wt.%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The thin-wall sand core for the automobile cylinder body is characterized by comprising the following components: synthetic sand, quartz sand, and phenol urethane resin.
2. The thin-wall sand core for the automobile cylinder body as claimed in claim 1, which is prepared from the following raw materials, by weight, 45-55 parts of artificial sand, 45-55 parts of quartz sand and 1-3 parts of phenol urethane resin.
3. The thin-walled sand core for an automobile cylinder block as claimed in claim 1 or 2, wherein said phenol urethane resin is a phenol resin and a polyisocyanate.
4. The thin-wall sand core for the automobile cylinder body is characterized by being prepared from the following raw materials in parts by weight of 50 parts of artificial sand, 50 parts of quartz sand, 0.935 part of phenolic resin and 0.765 part of polyisocyanate.
5. The thin-walled sand core for automotive cylinder blocks as claimed in claim 1, wherein said artificial sand has a composition parameter of Al 2 O 3 ％≥43at.％，SiO 2 ％≤52at.％，Fe 2 O 3 The percentage is less than or equal to 4 at.%, and the other percentage is less than or equal to 3 at.%; the characteristic parameter of the artificial sand is that the bulk density is 1.4-1.7g/cm 3 The angular coefficient is less than or equal to 1.1, the thermal expansion rate (1000 ℃) is less than or equal to 0.2%, the refractoriness is more than or equal to 1760 ℃, the ignition loss is less than or equal to 0.2%, the acid consumption value is less than or equal to 5mL/50g, the water content is less than or equal to 0.25%, the granularity is 40+50+70 meshes and more than or equal to 80 wt%, the single sieve of 40/50/70 meshes is less than or equal to 18-38 wt%, the number of 30 meshes and more than or equal to 22%, the number of 100 meshes and less than or equal to 10 wt%, and the number of 140 meshes and less than or equal to 1 wt%.
6. The thin-walled sand core for automobile cylinders as claimed in claim 1, wherein the quartz sand has a composition parameter of SiO 2 ％≥91at.％，Fe 2 O 3 The percent is less than or equal to 0.7at percent, and the mud content is less than or equal to 0.20wt percent; the quartz sand is characterized by the conductivity being less than or equal to 100uS/cm, the acid consumption value being less than or equal to 5mL/50g, the ignition loss being less than or equal to 0.3 wt.%, the granularity being 50+70+100 meshes being more than or equal to 80 wt.%, the 50/70/100 meshes being less than or equal to 48 wt.%, the granularity being 140 meshes and less than or equal to 3 wt.%, and the granularity being 40 meshes and more than or equal to 10 wt.%.
7. The thin-walled sand core for automobile cylinder bodies as claimed in claim 3, wherein the phenolic resin component and characteristic parameters are such that the density at 20 ℃ is from 1.02 to 1.15g/cm 3 The viscosity is less than or equal to 30s at 25 ℃; the polyisocyanate component and the characteristic parameters are that the density is 1.05-1.22g/cm at 20 DEG C 3 And the viscosity is less than or equal to 20s at 25 ℃.
8. A preparation method of a thin-wall sand core for an automobile cylinder body is characterized by comprising the following steps:
1) selecting materials: selecting 50 parts of artificial sand, 50 parts of quartz sand, 0.935 part of phenolic resin and 0.765 part of polyisocyanate according to the parts by weight, wherein the temperature of the artificial sand, the quartz sand, the phenolic resin and the polyisocyanate is 25-35 ℃;
2) mixing materials: starting a sand mixer, wherein the central axis of the sand mixer is vertical, the rotating speed of the sand mixer is 90-100 r/min, artificial sand and quartz sand are added into the sand mixer, when 3/4 is added into the artificial sand and the quartz sand, phenolic resin is added, the interval between phenolic resin and polyisocyanate addition ports is 200-300mm, the distance between the phenolic resin and polyisocyanate addition ports is 150-200mm away from the central rotating shaft of the sand mixer, after 2-4 seconds of phenolic resin addition, polyisocyanate is added, the adding time of the phenolic resin and the polyisocyanate is 5-15 seconds, and after the simultaneous addition of the phenolic resin and the polyisocyanate is finished, the timing is started for 40 seconds;
3) preparing a sand core: curing by using triethylamine, wherein the amine blowing time is 7.0 +/-1 s, the initial amine blowing pressure is 0.2 +/-0.1 bar, the amine blowing finishing pressure is 4.0 +/-1.0 bar, the amine addition amount is 1.13g of amine per kilogram of sand, the curing time is 25 +/-5 s, and the triethylamine heating temperature is 100-; the sand shooting pressure is 4.0 +/-0.5 bar, and the sand shooting time is 3 +/-0.5 s.
9. The method for preparing the thin-wall sand core for the automobile cylinder body as claimed in claim 8, wherein the artificial sand is prepared by calcining flint clay at high temperature, pulverizing and sintering, and the composition parameter of the artificial sand is Al 2 O 3 ％≥43at.％，SiO 2 ％≤52at.％，Fe 2 O 3 The percentage is less than or equal to 4 at.%, and the other percentage is less than or equal to 3 at.%; the characteristic parameter of the artificial sand is that the bulk density is 1.4-1.7g/cm 3 The angular coefficient is less than or equal to 1.1, the thermal expansion rate (1000 ℃) is less than or equal to 0.2%, the refractoriness is more than or equal to 1760 ℃, the ignition loss is less than or equal to 0.2%, the acid consumption value is less than or equal to 5mL/50g, the water content is less than or equal to 0.25%, the granularity is 40+50+70 meshes and more than or equal to 80 wt%, the single sieve of 40/50/70 meshes is less than or equal to 18-38 wt%, the number of 30 meshes and more than or equal to 22%, the number of 100 meshes and less than or equal to 10 wt%, and the number of 140 meshes and less than or equal to 1 wt%.
10. The method for preparing the thin-walled sand core for the automobile cylinder body as claimed in claim 8, wherein the adding time of the phenolic resin and the polyisocyanate is 10 seconds.
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