CN112792295A - Casting molding process with low content of water glass - Google Patents
Casting molding process with low content of water glass Download PDFInfo
- Publication number
- CN112792295A CN112792295A CN202011508188.2A CN202011508188A CN112792295A CN 112792295 A CN112792295 A CN 112792295A CN 202011508188 A CN202011508188 A CN 202011508188A CN 112792295 A CN112792295 A CN 112792295A
- Authority
- CN
- China
- Prior art keywords
- sand
- water glass
- raw
- casting
- core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 235000019353 potassium silicate Nutrition 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005266 casting Methods 0.000 title claims abstract description 26
- 238000000465 moulding Methods 0.000 title claims abstract description 19
- 230000008569 process Effects 0.000 title claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 130
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 122
- 239000000377 silicon dioxide Substances 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 4
- 230000008929 regeneration Effects 0.000 abstract description 4
- 238000011069 regeneration method Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 150000002895 organic esters Chemical class 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000003110 molding sand Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- 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
- 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
- B22C1/18—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 inorganic agents
- B22C1/186—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 inorganic agents contaming ammonium or metal silicates, silica sols
- B22C1/188—Alkali metal silicates
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention provides a casting molding process with lower water glass content, which adopts a molding method of facing sand and back sand in the casting process, wherein the sand mold next to a movable part adopts facing sand, and the facing sand is formed by adding water glass which accounts for 3.7-4.2% of the proportion of the raw sand into the raw sand; the sand mould far away from the movable part and the riser box sand mould adopt back sand, and the back sand is formed by adding water glass which accounts for 2.8-3.5% of the proportion of the reclaimed sand into the reclaimed sand; the sand core is made of raw sand and 3.8-4.5% of water glass is added; the dry lifting method is adopted to blow CO to the sand mould and the sand core2And after the sand mold is hardened, stripping and core stripping are carried out. The beneficial effects are as follows: the addition of the water glass is greatly reduced under the condition of ensuring the quality of the casting, the hardness and collapsibility of the used water glass sand are improved, and a convenient condition is provided for realizing the regeneration of the used water glass sand; the consumption of the water glass is reduced, and the cost of purchasing the water glass by enterprises is further reduced; realizes the recycling of the silica sand and greatly saves the casting costSilica sand is an irreproducible resource.
Description
Technical Field
The invention relates to the field of casting, in particular to a casting molding process with low water glass content.
Background
In order to change collapsibility of the sodium silicate-bonded sand, some manufacturers add a plurality of crumbling agents such as kaolin, limestone powder, iron oxide powder, magnesium oxide powder and the like during sand mixing separately or simultaneously. The collapsibility of the water glass sand is improved to a certain extent, but the effect is not obvious because the adding amount of the water glass is higher
The resin sand appeared in the later period has high hardening strength and good collapsibility. But the odor is pungent and has certain toxicity and the price is expensive, so that the application of the odor in a large scale is not realized.
In recent years, with the stricter requirements on environmental protection, research on nontoxic and odorless sodium silicate-bonded sand is promoted, and ester-hardened (organic ester) self-hardening sand is greatly influenced. The technology of adding modified water glass and organic ester (also called curing agent) into the self-hardening sand has great breakthrough in improving collapsibility, and the adding amount of the water glass is also lower. However, sand on the surface of the casting is not easy to fall off, and the subsequent procedure is difficult to shovel sand, the size precision of the casting is affected by the creep phenomenon of a sand mold (core), special baking equipment and the like are needed, even the casting is produced by matching with automatic production equipment, and the organic ester is expensive and needs certain investment. The cost is higher compared with the water glass CO2 hardened sand.
Most foundries still adopt the water glass sand CO2 hardening method to produce and manufacture.
The water glass CO2 hardened sand is the earliest method for gas hardening molding (core) for industrial application, and is still the main molding sand for steel casting production in China at present. Sodium silicate-bonded sand was regarded as important after the emergence of the CO2 hardening method in 1947. The CO2 hardening method of sodium silicate sand has various advantages of air hardening method modeling (core), but has the problems of poor collapsibility of molding sand, low hardening strength, difficult regeneration of used sand and the like, so that the application of the method is limited.
Disclosure of Invention
The invention provides a casting molding process with low water glass content to solve the problems in the prior art.
The technical scheme of the invention is realized as follows:
a casting molding process with low water glass content adopts a molding method of facing sand and back sand in the casting process, the sand mold next to a movable part adopts facing sand, and the facing sand is formed by adding water glass which accounts for 3.7-4.2% of the proportion of raw sand into the raw sand; the sand mould far away from the movable part and the riser box sand mould adopt back sand, and the back sand is formed by adding water glass which accounts for 2.8-3.5% of the proportion of the reclaimed sand into the reclaimed sand; the sand core is made of raw sand and 3.8-4.5% of water glass is added;
in the process of molding stripping and sand core box stripping, a dry stripping method is adopted to blow CO to the sand mold and the sand core2And after the sand mold is hardened, stripping and core stripping are carried out.
Furthermore, the facing sand is prepared by adding water glass which accounts for 4 percent of the proportion of the raw sand into the raw sand.
Furthermore, the back sand is prepared by adding water glass which accounts for 3 percent of the specific weight of the reclaimed sand into the reclaimed sand.
Furthermore, the sand core is made of raw sand and 4% of water glass is added into the raw sand.
The beneficial effects are that:
1. under the condition of ensuring the quality of the casting, the adding amount of the water glass of the sand mold (core) is greatly reduced, the hardness and collapsibility of the used water glass sand are improved, and a convenient condition is provided for realizing the regeneration of the used water glass sand;
2. the consumption of the water glass is reduced, and the cost of purchasing the water glass by enterprises is further reduced;
3. the cooperation has the enterprise of sand regeneration facility, can better realize the recycle of grit, has practiced thrift this non-renewable resource of silica sand for the casting greatly, reduces or has avoided carrying out the environmental pollution that solid abandonment discharged and bring because of not good recycle.
Detailed Description
All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
A casting molding process with low water glass content adopts a molding method of facing sand and back sand in the casting process, the sand mold next to a movable part adopts facing sand, and the facing sand is formed by adding water glass which accounts for 3.7-4.2% of the proportion of raw sand into the raw sand; the sand mould far away from the movable part and the riser box sand mould adopt back sand, and the back sand is formed by adding water glass which accounts for 2.8-3.5% of the proportion of the reclaimed sand into the reclaimed sand; the sand core is made of raw sand and 3.8-4.5% of water glass is added;
the raw sand refers to used silica sand, and the reclaimed sand refers to used silica sand which is recycled.
In the process of molding stripping and sand core box stripping, a dry stripping method is adopted to blow CO to the sand mold and the sand core2And (3) stripping and core stripping are carried out after the sand mold is hardened, and the strength of the sand mold can meet the requirement under the condition of lower compactness of the sand mold by a dry stripping method.
The sand mold has low compactness, can better realize the recycling of sand, greatly saves the non-renewable resource of silica sand for casting, and reduces or avoids the environmental pollution caused by solid waste discharge due to poor recycling.
Example one
The facing sand is prepared by adding water glass which accounts for 4 percent of the proportion of the raw sand into the raw sand.
The back sand is prepared by adding water glass which accounts for 3 percent of the proportion of the reclaimed sand into the reclaimed sand.
The sand core is made of raw sand and 4% of water glass is added into the raw sand.
The low water glass adding amount of the water glass sand mold is beneficial to the stripping of sand on the surface of a casting to a certain extent, obviously improves the difficult situation of recovering and crushing the used water glass sand, and provides possible conditions for the recycling of the sand.
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 (4)
1. A casting molding process with low water glass content is characterized in that: a molding method of facing sand and back sand is adopted in the casting process, the sand mold close to the movable part adopts facing sand, and the facing sand is formed by adding water glass which accounts for 3.7-4.2% of the proportion of the raw sand into the raw sand; the sand mould far away from the movable part and the riser box sand mould adopt back sand, and the back sand is formed by adding water glass which accounts for 2.8-3.5% of the proportion of the reclaimed sand into the reclaimed sand; the sand core is made of raw sand and 3.8-4.5% of water glass is added;
in the process of molding stripping and sand core box stripping, a dry stripping method is adopted to blow CO to the sand mold and the sand core2And after the sand mold is hardened, stripping and core stripping are carried out.
2. A casting molding process with low water glass content as claimed in claim 1, characterized in that: the facing sand is prepared by adding water glass which accounts for 4 percent of the proportion of the raw sand into the raw sand.
3. A casting molding process with low water glass content as claimed in claim 1, characterized in that: the back sand is prepared by adding water glass which accounts for 3 percent of the proportion of the reclaimed sand into the reclaimed sand.
4. A casting molding process with low water glass content as claimed in claim 1, characterized in that: the sand core is made of raw sand and 4% of water glass is added into the raw sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011508188.2A CN112792295A (en) | 2020-12-19 | 2020-12-19 | Casting molding process with low content of water glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011508188.2A CN112792295A (en) | 2020-12-19 | 2020-12-19 | Casting molding process with low content of water glass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112792295A true CN112792295A (en) | 2021-05-14 |
Family
ID=75807009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011508188.2A Pending CN112792295A (en) | 2020-12-19 | 2020-12-19 | Casting molding process with low content of water glass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112792295A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1682030A1 (en) * | 1989-07-06 | 1991-10-07 | Институт проблем литья АН УССР | Method of preparation of water glass binder for mould and core sand |
| CN1613573A (en) * | 2004-10-18 | 2005-05-11 | 中铁宝桥股份有限公司 | Water glass and resin mixed CO2 hardening method |
| CN101391453A (en) * | 2008-10-24 | 2009-03-25 | 华中科技大学 | Microwave heating method for water glass sand mold or sand core |
| CN101509667A (en) * | 2009-03-09 | 2009-08-19 | 上海市机械制造工艺研究所有限公司 | Grate production process for steel mill sintering apparatus |
| CN101947636A (en) * | 2010-04-09 | 2011-01-19 | 温州开诚机械有限公司 | Composite molding process of alkaline phenol formaldehyde resin facing sand and ester-hardened sodium silicate backing sand |
| CN105665646A (en) * | 2016-03-08 | 2016-06-15 | 沈阳汇亚通铸造材料有限责任公司 | Efficient molding core production method for water glass sand blowing hardening |
| CN106378420A (en) * | 2016-03-08 | 2017-02-08 | 沈阳汇亚通铸造材料有限责任公司 | Mould core making method for casting sodium silicate sand air-blowing hardening |
| CN109420743A (en) * | 2017-08-31 | 2019-03-05 | 沈阳汇亚通铸造材料有限责任公司 | A kind of efficient core-making method of water-glass sand air blowing hardening |
| US20190388960A1 (en) * | 2016-02-05 | 2019-12-26 | Jinan Shengquan Group Share-Holding Co., Ltd. | Curing agent for water glass molding and manufacturing method and use thereof |
| CN110711846A (en) * | 2019-11-06 | 2020-01-21 | 中国第一汽车股份有限公司 | Method for making core of inorganic binder sand cold core box for casting |
| CN110860646A (en) * | 2019-12-05 | 2020-03-06 | 中铁山桥集团有限公司 | Foundry sand composition and casting method |
-
2020
- 2020-12-19 CN CN202011508188.2A patent/CN112792295A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1682030A1 (en) * | 1989-07-06 | 1991-10-07 | Институт проблем литья АН УССР | Method of preparation of water glass binder for mould and core sand |
| CN1613573A (en) * | 2004-10-18 | 2005-05-11 | 中铁宝桥股份有限公司 | Water glass and resin mixed CO2 hardening method |
| CN101391453A (en) * | 2008-10-24 | 2009-03-25 | 华中科技大学 | Microwave heating method for water glass sand mold or sand core |
| CN101509667A (en) * | 2009-03-09 | 2009-08-19 | 上海市机械制造工艺研究所有限公司 | Grate production process for steel mill sintering apparatus |
| CN101947636A (en) * | 2010-04-09 | 2011-01-19 | 温州开诚机械有限公司 | Composite molding process of alkaline phenol formaldehyde resin facing sand and ester-hardened sodium silicate backing sand |
| US20190388960A1 (en) * | 2016-02-05 | 2019-12-26 | Jinan Shengquan Group Share-Holding Co., Ltd. | Curing agent for water glass molding and manufacturing method and use thereof |
| CN105665646A (en) * | 2016-03-08 | 2016-06-15 | 沈阳汇亚通铸造材料有限责任公司 | Efficient molding core production method for water glass sand blowing hardening |
| CN106378420A (en) * | 2016-03-08 | 2017-02-08 | 沈阳汇亚通铸造材料有限责任公司 | Mould core making method for casting sodium silicate sand air-blowing hardening |
| CN109420743A (en) * | 2017-08-31 | 2019-03-05 | 沈阳汇亚通铸造材料有限责任公司 | A kind of efficient core-making method of water-glass sand air blowing hardening |
| CN110711846A (en) * | 2019-11-06 | 2020-01-21 | 中国第一汽车股份有限公司 | Method for making core of inorganic binder sand cold core box for casting |
| CN110860646A (en) * | 2019-12-05 | 2020-03-06 | 中铁山桥集团有限公司 | Foundry sand composition and casting method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210514 |
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| RJ01 | Rejection of invention patent application after publication |