CN109967690B - Precoated sand for gravity casting of thin-wall aluminum alloy casting and using method thereof - Google Patents
Precoated sand for gravity casting of thin-wall aluminum alloy casting and using method thereof Download PDFInfo
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- CN109967690B CN109967690B CN201910238106.8A CN201910238106A CN109967690B CN 109967690 B CN109967690 B CN 109967690B CN 201910238106 A CN201910238106 A CN 201910238106A CN 109967690 B CN109967690 B CN 109967690B
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- sand
- mold part
- precoated sand
- casting
- thin
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- 239000004576 sand Substances 0.000 title claims abstract description 115
- 238000005266 casting Methods 0.000 title claims abstract description 54
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 22
- 230000005484 gravity Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000314 lubricant Substances 0.000 claims abstract description 9
- 239000004831 Hot glue Substances 0.000 claims abstract description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 109
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical group [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 10
- 235000013539 calcium stearate Nutrition 0.000 claims description 10
- 239000008116 calcium stearate Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 239000005011 phenolic resin Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- YMHQVDAATAEZLO-UHFFFAOYSA-N cyclohexane-1,1-diamine Chemical compound NC1(N)CCCCC1 YMHQVDAATAEZLO-UHFFFAOYSA-N 0.000 claims description 4
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 4
- 229920002554 vinyl polymer Polymers 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims 1
- 239000011347 resin Substances 0.000 abstract description 10
- 229920005989 resin Polymers 0.000 abstract description 10
- 238000007599 discharging Methods 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000003110 molding sand Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- QQGISFDJEJMKIL-JAIQZWGSSA-N (5z)-5-[[3-(hydroxymethyl)thiophen-2-yl]methylidene]-10-methoxy-2,2,4-trimethyl-1h-chromeno[3,4-f]quinolin-9-ol Chemical compound C1=CC=2NC(C)(C)C=C(C)C=2C2=C1C=1C(OC)=C(O)C=CC=1O\C2=C/C=1SC=CC=1CO QQGISFDJEJMKIL-JAIQZWGSSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 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
- 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
-
- 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
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
Abstract
The invention discloses precoated sand for gravity casting of thin-wall aluminum alloy castings, which comprises inner mold part precoated sand and outer mold part precoated sand, wherein the inner mold part precoated sand comprises 1.5-2% of resin, 0.08-0.16% of curing agent, 0.02-0.08% of lubricant and the balance of pure sand; the external mold part coated sand comprises 5-12% of polyvinyl alcohol, 3-8% of EVA hot melt adhesive, 0.1-0.15% of curing agent, 0.01-0.05% of lubricant and the balance of pure sand. The sand-coated sand of the internal mold part has high density, and the polyvinyl alcohol and the EVA hot melt adhesive in the sand-coated sand of the external mold part are separated from the sand-coated sand in high-temperature nitrogen flow, so that the external part of the sand-coated sand forms a uniform porous structure, and the porous structure is favorable for discharging air during casting.
Description
Technical Field
The invention relates to the field of casting, in particular to precoated sand for gravity casting of a thin-wall aluminum alloy casting and a using method thereof.
Background
The inorganic molding sand is a material for manufacturing a mold core in casting production, is widely used for producing complex castings of automobile cylinder bodies, cylinder covers, intake manifolds, various pipe fittings, pump bodies and the like, has the advantages of strong adaptability, good fluidity, good collapsibility, smooth casting surface, high yield and the like, and has an irreplaceable position in the casting industry. The core is mostly surrounded by the high temperature liquid metal in the mold, and the size of the supporting and positioning portion is generally small, so that the core sand should have high strength, air permeability, collapsibility, and collapsibility in addition to the performance of the general molding sand. The core sand is divided into clay core sand, water glass core sand, oil core sand, synthetic fat core sand, resin core sand and the like according to different binders. Coating a layer of solid resin film on the surface of the inorganic molding sand to obtain resin sand, driving the resin sand into a mold cavity, forming the resin sand by a heating or catalyst method, and then putting the formed mud core into a casting mold for casting.
The aluminum product has excellent properties of easy processing, good mechanical property, light weight and the like, and plays an important role in production and life, and the most common preparation of the aluminum product is aluminum liquid gravity casting molding. When resin sand is used for gravity casting of aluminum alloy, the resin sand meets the requirements of high sand core strength, good heat conduction, low gas evolution and the like, and particularly, the casting is incomplete due to the fact that the temperature of molten aluminum is reduced quickly and the filling is not good when the gravity casting of thin-wall aluminum alloy parts with the wall thickness of less than 5mm is carried out. Therefore, special precoated sand is needed for gravity casting of thin-wall aluminum alloy products.
Disclosure of Invention
The invention provides precoated sand for gravity casting of thin-wall aluminum alloy castings and a using method thereof, aiming at the problem that the existing precoated sand cannot meet the gravity casting requirement of thin-wall aluminum alloy workpieces.
The technical scheme for solving the technical problems is as follows: the precoated sand for gravity casting of the thin-wall aluminum alloy casting comprises inner mold part precoated sand and outer mold part precoated sand, and is characterized in that the inner mold part precoated sand comprises the following components in percentage by weight: 1.5 to 2 percent of resin, 0.08 to 0.16 percent of curing agent, 0.02 to 0.08 percent of lubricant and the balance of pure sand; the outer mold part precoated sand comprises the following components in percentage by weight: 5 to 12 percent of polyvinyl alcohol, 3 to 8 percent of EVA hot melt adhesive, 0.1 to 0.15 percent of curing agent, 0.01 to 0.05 percent of lubricant and the balance of pure sand.
The resin is phenol resin or phenolic resin; the curing agent is one of urotropine, vinyl triamine or diaminocyclohexane; the lubricant is selected from calcium stearate or a mixture of calcium stearate and graphite powder according to the weight percentage of 1: 1; the pure sand is silica sand or limestone sand.
The invention also discloses a using method of the precoated sand, which comprises the following steps:
1) respectively weighing the components of the inner mold part precoated sand and the outer mold part precoated sand according to the weight percentage, and respectively and uniformly mixing for later use;
2) constructing a casting space in the mold by using the inner mold part precoated sand, filling the space except the inner mold part precoated sand by using the outer mold part precoated sand, and compacting;
3) the compacted precoated sand is put into a nitrogen incinerator at the temperature of 200-250 ℃, and the temperature is kept to be N2The flow is 10-40L/min, and the material is taken out after being burned for 2-4 h;
4) and casting the aluminum liquid into the precoated sand, cleaning the outer external mold part precoated sand after solidification and shaping, cleaning the inner mold part precoated sand, and respectively placing for recycling.
The invention has the beneficial effects that: the precoated sand comprises inner mold part precoated sand and outer mold part precoated sand, the molding sand density of the inner mold part precoated sand is high, the fixed mold molding effect is achieved, polyvinyl alcohol and EVA hot melt adhesive in the outer mold part precoated sand are separated from the molding sand in a high-temperature nitrogen flow, a uniform porous structure is formed outside the precoated sand, the porous structure has a supporting effect on the inner mold part precoated sand, the porous structure is also beneficial to air discharge during casting, and the phenomenon of poor aluminum liquid filling mold can be effectively reduced. The precoated sand is suitable for gravity casting of thin-wall aluminum alloy castings, has the advantages of high hardness, moderate heat conduction, strong aluminum liquid impact resistance and the like, is moderate in proportion of the lubricant added in the formula, has good infiltration on aluminum liquid, is good in aluminum liquid mold filling when the thin-wall aluminum alloy castings are cast, and is complete in shape and smooth in surface of aluminum alloy workpieces. The precoated sand disclosed by the invention is simple in component and convenient to use, and can improve the gravity casting yield of aluminum alloy castings with the wall thickness of less than 5mm to more than 95%.
Detailed Description
The present invention is described below with reference to examples, which are provided for illustration only and are not intended to limit the scope of the present invention.
Example 1
The precoated sand for gravity casting of the thin-wall aluminum alloy casting comprises inner mold part precoated sand and outer mold part precoated sand, wherein the inner mold part precoated sand comprises the following components in percentage by weight: 1.5% of phenol resin, 0.08% of urotropine, 0.02% of calcium stearate and 98.4% of silica sand; the outer mold part precoated sand comprises the following components in percentage by weight: 5% of polyvinyl alcohol, 8% of EVA hot melt adhesive, 0.1% of urotropine, 0.01% of calcium stearate and 86.89% of pure sand.
Example 2
The precoated sand for gravity casting of the thin-wall aluminum alloy casting comprises inner mold part precoated sand and outer mold part precoated sand, wherein the inner mold part precoated sand comprises the following components in percentage by weight: 1.7 percent of phenolic resin, 0.12 percent of vinyl triamine, 0.05 percent of mixture of calcium stearate and graphite powder according to the weight percentage of 1:1 and 98.13 percent of limestone sand; the outer mold part precoated sand comprises the following components in percentage by weight: 8% of polyvinyl alcohol, 6% of EVA hot melt adhesive, 0.13% of vinyl triamine, 0.03% of mixture of calcium stearate and graphite powder according to the weight percentage of 1:1 and 85.84% of pure sand.
Example 3
The precoated sand for gravity casting of the thin-wall aluminum alloy casting comprises inner mold part precoated sand and outer mold part precoated sand, wherein the inner mold part precoated sand comprises the following components in percentage by weight: 2% of phenol resin, 0.16% of diaminocyclohexane, 0.08% of calcium stearate and 97.76% of silica sand; the outer mold part precoated sand comprises the following components in percentage by weight: 12% of polyvinyl alcohol, 3% of EVA hot melt adhesive, 0.15% of diaminocyclohexane, 0.05% of calcium stearate and 84.8% of pure sand.
Embodiment 1-3 method of using precoated sand for gravity casting of thin-walled aluminum alloy castings, comprising the steps of:
1) respectively weighing the components of the inner mold part precoated sand and the outer mold part precoated sand according to the weight percentage, and respectively and uniformly mixing for later use;
2) constructing a casting space in the mold by using the inner mold part precoated sand, filling the space except the inner mold part precoated sand by using the outer mold part precoated sand, and compacting;
3) the compacted precoated sand is put into a nitrogen incinerator at the temperature of 200-250 ℃, and the temperature is kept to be N2The flow is 10-40L/min, and the material is taken out after being burned for 2-4 h;
4) and casting the aluminum liquid into the precoated sand, cleaning the outer external mold part precoated sand after solidification and shaping, cleaning the inner mold part precoated sand, and respectively placing for recycling.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The precoated sand for gravity casting of the thin-wall aluminum alloy casting comprises inner mold part precoated sand and outer mold part precoated sand, and is characterized in that,
the internal mold part precoated sand comprises the following components in percentage by weight: 1.5-2% of phenol resin or phenolic resin, 0.08-0.16% of curing agent, 0.02-0.08% of lubricant and the balance of pure sand;
the outer mold part precoated sand comprises the following components in percentage by weight: 5 to 12 percent of polyvinyl alcohol, 3 to 8 percent of EVA hot melt adhesive, 0.1 to 0.15 percent of curing agent, 0.01 to 0.05 percent of lubricant and the balance of pure sand.
2. The coated sand for gravity casting of thin-walled aluminum alloy castings according to claim 1, wherein the curing agent is one of urotropin, vinyl triamine, or diaminocyclohexane.
3. Coated sand for gravity casting of thin-walled aluminium alloy castings according to claim 1, characterized in that the lubricant is selected from calcium stearate or a mixture of calcium stearate and graphite powder in a weight ratio of 1: 1.
4. The coated sand for gravity casting of thin-walled aluminum alloy castings according to claim 1, wherein the pure sand is silica sand or limestone sand.
5. A method of using precoated sand according to any one of claims 1 to 4, characterized by comprising the steps of:
1) respectively weighing the components of the inner mold part precoated sand and the outer mold part precoated sand according to the weight percentage, and respectively and uniformly mixing for later use;
2) constructing a casting space in the mold by using the inner mold part precoated sand, filling the space except the inner mold part precoated sand by using the outer mold part precoated sand, and compacting;
3) the compacted precoated sand mold is put into a nitrogen incinerator at the temperature of 200-250 ℃, and the temperature is kept to be N2The flow is 10-40L/min, and the material is taken out after being burned for 2-4 h;
4) and casting the aluminum liquid into a precoated sand mold, cleaning the precoated sand of the outer external mold part after solidification and shaping, cleaning the precoated sand of the inner mold part, and respectively placing for recycling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910238106.8A CN109967690B (en) | 2019-03-27 | 2019-03-27 | Precoated sand for gravity casting of thin-wall aluminum alloy casting and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910238106.8A CN109967690B (en) | 2019-03-27 | 2019-03-27 | Precoated sand for gravity casting of thin-wall aluminum alloy casting and using method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109967690A CN109967690A (en) | 2019-07-05 |
| CN109967690B true CN109967690B (en) | 2020-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201910238106.8A Active CN109967690B (en) | 2019-03-27 | 2019-03-27 | Precoated sand for gravity casting of thin-wall aluminum alloy casting and using method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109967690B (en) |
Families Citing this family (1)
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| CN110560628B (en) * | 2019-08-30 | 2021-08-31 | 宁夏共享化工有限公司 | Preparation method of curing agent for self-hardening furan resin |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3077648A (en) * | 1960-02-01 | 1963-02-19 | Union Carbide Corp | Multi-layer shell mold |
| CN1083752A (en) * | 1993-08-31 | 1994-03-16 | 秦升益 | A kind of compound technology for filming sand |
| CN1275455A (en) * | 2000-06-13 | 2000-12-06 | 秦升益 | Composite mould (core) making technology and device thereof |
| CN1544183A (en) * | 2003-11-21 | 2004-11-10 | 徐开华 | Precoated sand and fence-mending sand composite core making method |
| CN1569360A (en) * | 2003-11-21 | 2005-01-26 | 徐开华 | Precoated sand and water glass sand composite core making method |
| CN103586397A (en) * | 2013-11-27 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Casting sand for casting stainless steel end enclosure |
| CN104209450A (en) * | 2014-09-04 | 2014-12-17 | 河南省西峡汽车水泵股份有限公司 | Special precoated sand for cast of high alloy material |
| CN108746479A (en) * | 2018-09-03 | 2018-11-06 | 王韶华 | A kind of preparation method of the easy defeated and dispersed precoated sand of easy filling |
-
2019
- 2019-03-27 CN CN201910238106.8A patent/CN109967690B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3077648A (en) * | 1960-02-01 | 1963-02-19 | Union Carbide Corp | Multi-layer shell mold |
| CN1083752A (en) * | 1993-08-31 | 1994-03-16 | 秦升益 | A kind of compound technology for filming sand |
| CN1275455A (en) * | 2000-06-13 | 2000-12-06 | 秦升益 | Composite mould (core) making technology and device thereof |
| CN1544183A (en) * | 2003-11-21 | 2004-11-10 | 徐开华 | Precoated sand and fence-mending sand composite core making method |
| CN1569360A (en) * | 2003-11-21 | 2005-01-26 | 徐开华 | Precoated sand and water glass sand composite core making method |
| CN103586397A (en) * | 2013-11-27 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Casting sand for casting stainless steel end enclosure |
| CN104209450A (en) * | 2014-09-04 | 2014-12-17 | 河南省西峡汽车水泵股份有限公司 | Special precoated sand for cast of high alloy material |
| CN108746479A (en) * | 2018-09-03 | 2018-11-06 | 王韶华 | A kind of preparation method of the easy defeated and dispersed precoated sand of easy filling |
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Address after: No. 67 Shangzhuang Road, Fushan District, Yantai City, Shandong Province, 264000 Patentee after: Yantai Tongdingzhou Auto Parts Co.,Ltd. Address before: No. 67 Shangzhuang Road, Fushan District, Yantai City, Shandong Province, 264000 Patentee before: YANTAI TONGDINGZHOU AUTO PARTS CO.,LTD. |
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