CN1255234C - Method for making core by blowing to harden cold-box - Google Patents
Method for making core by blowing to harden cold-box Download PDFInfo
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- CN1255234C CN1255234C CN 01133477 CN01133477A CN1255234C CN 1255234 C CN1255234 C CN 1255234C CN 01133477 CN01133477 CN 01133477 CN 01133477 A CN01133477 A CN 01133477A CN 1255234 C CN1255234 C CN 1255234C
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- blowing
- box
- sand
- cold
- making core
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Abstract
The present invention relates to a method for making cores by blowing to harden cold-box, which mixes raw sand and adhesive through sand jetting, manual molding and blowing hardening and uses water glass as the adhesive. The present invention is characterized in that gas used in the present invention is mixed gas of C2 to C4 of organic ester with air or nitrogen; the volume of the organic ester is of 10 to 90 of the total amount of the volume of the mixed gas; the blowing time is from 1 to 120 seconds. The present invention has the advantages of wide sources of the adhesive for making cores, low price, no poison, no smell and low cost of core making, and the present invention is favorable for improving working sanitary conditions and protecting environments.
Description
Technical field:
The present invention relates to foundry engieering, provide a kind of especially and done the cold-box process method that binding agent is blown into atomizing organic ester and dry air with waterglass.
Background technology:
In Foundry Production, adopt vegetable oil in the past, close lipid thermosetting material and make the coremaking binding agent.Need baking ability sclerosis in several hours in stove behind the core consolidation, the energy consumption height, the production cycle is long, and is prone to core distortion, damage in the production process, influences casting quality.Five, shell core has successively appearred in the sixties, the hot box process technology.Shell core and hot box adopt synthetic resin to make binding agent, and core a few minutes in the core box of heating can harden, and have realized the mechanization production in enormous quantities of coremaking.The oil-sand technology that has progressively replaced baking.The triethylamine cold-box process has been invented by nineteen sixty-eight U.S. Ashland company, and adopting the component I of binding agent is phenolic resins, and component I I is many aromatic radicals isocyanates.Be blown in the core box, realize the core cold(-)setting with triethylamine (or dimethyl amine, trimethylamine etc.) aerosol.Cold-box is compared with hot method coremaking, and core box need not heat, and need not consider the influence of mold hot distortion to the core size during mould design, and mould not only available metal is manufactured, and also available plastics, timber are manufactured.Core production efficiency height, dimensional discrepancy are little, energy efficient, and working condition is improved relatively, and later various countries have developed furane resins SO again in succession
2Method, alkalescent phenol resin methyl formate method (β-set method), phenolic resins are sneaked into the red hard cold-box process of acidic materials air blowing sclerosis acetal, (Red-Set method) acrylates blows CO
2Method, alkalescent phenol resin blow CO
2Method.These cold-box processes have remedied the deficiency of blowing the amine cold-box process, the range of application of having widened cold core box process.Make cold core box process become one of topmost core manufacturing craft in the present Foundry Production, but these technologies all should be made binding agent with the artificial synthetic resin, cost an arm and a leg, increase the production cost of foundry goods.These binding agents contain harmful substances such as aromatic substance, free phenol, free aldehyde, isocyanide root in various degree, and influence labour health condition, and antiquated sand, the flue gas of generation also pollute environment.In blow cores gas, triethylamine (dimethyl amine, trimethylamine), SO
2All poisonous, penetrating odor is arranged.The severe exacerbation working condition, the infringement field personnel's is healthy.Development along with society; people more and more recognize the harm of environmental pollution; environmental protection causes whole world attention; cold-box process binding agent and blow cores are with the harm of gas to environment; be the problem that vast casting technique person pays close attention to, developing free of contamination cold core box core process is one of foundry engieering developing direction always.For this reason, the inventor had once submitted a relevant " non-toxic air-blowing hardening core-making method " on January 15th, 1997 to Patent Office of the People's Republic of China, use nontoxic, tasteless air to blow in this method, nontoxic waterglass is made bonding agent, can prevent effectively that foundry goods from producing pore, hot tearing, burr and vein defective, but firm time is longer, generally needs 2 minutes, leads thereby reduced labour productive forces.
Summary of the invention:
The invention provides and a kind ofly make the coremaking binding agent, and can realize the cold box process of core quick-hardening with waterglass.Be specially roughing sand is mixed, penetrates sand or offhand, air blowing sclerosis with bonding agent, make bonding agent with waterglass, it is characterized in that: gases used gaseous mixture for the organic ester of C2～C4 and air or nitrogen, organic ester account for 45～65% volumes of mist total amount, gassing time 10～15s.
In the method for making core by blowing to harden cold-box of the present invention, can be after air blowing, intermittently 5～20s is blown into air or nitrogen, time 5-15s again.
In the method for making core by blowing to harden cold-box of the present invention, used organic ester preferably accounts for 45～65% volumes of mist total amount, can be for methyl formate, Ethyl formate, methyl acetate any or multiple.The most frequently used ester is the methyl esters methyl esters.
In the method for making core by blowing to harden cold-box of the present invention, described air or nitrogen are that dew point is lower than dry air or the nitrogen below-20 ℃, can handle through freezing or adsorption and dehumidification.
In the method for making core by blowing to harden cold-box of the present invention, described waterglass is casting water glass, consists of:
M
2OmSiO
2The 30-60% quality
H
2O 40-70% quality
M wherein
+Be Na
+, K
+, Li
+, Rb
+In one or more, m is 1.6～3.5.
Described casting water glass can also add modifier, modifier is selected from dextrin, sugar, molasses, xylitol, Sodium Polyacrylate, polyacrylamide, sodium phosphate trimer, cellulose, humic acid, sodium humate, resin, the hydrogenated glucose one or more, consists of:
Casting water glass 90.9% quality
Modifier 9.1% quality.
In the method for making core by blowing to harden cold-box of the present invention, the modulus of waterglass, m are preferably and are 2-3.
In the method for making core by blowing to harden cold-box of the present invention, coremaking can be selected various castings roughing sand such as natural silica Sand, washing silica sand, selected silica sand, zircon sand, magnesia, sillimanite sand, aquamarine stone sand, forsterite sand for use with roughing sand, the most frequently used is the washing silica sand, and mix material proportioning is:
Roughing sand 97.09-98.04% quality
Bonding agent 1.96-2.91% quality.
Proportioning commonly used is: washing silica sand 97-98.5%, waterglass 1.5-3.0%.
The mixed system of medium sand compound of the present invention can adopt the efficient puddle mixer of batch (-type): as the bowl-type puddle mixer, and the special-purpose puddle mixer of also available common cold-box core making machine.
Coremaking can be adopted common cold-box core making machine, and gas generator can adopt methyl formate argoshield generator, and air dewetting can be adopted and blow amine cold core box process universal air dehydrating unit.Also can be used for worker's consolidation for small lot coremaking, be equipped with hand-guided cold-box gas generator.
Core-making method of the present invention has following advantage:
1. coremaking binding agent source is wide, low price, and nonpoisonous and tasteless, the coremaking cost is low, helps improving labour health condition and protection environment.
With blow amine cold-box and SO
2Cold-box is compared, and it is nontoxic relatively to blow strong-willed body.Improved working condition.
3. do not contain harmful elements such as N, P, S in the adhesive system, help guaranteeing castability, be particularly suited for producing carbon steel, stainless steel, alloy steel casting, nodular iron casting.
4. the core produced of this method has suitable thermoplasticity at the cast initial stage, can prevent that foundry goods from producing hot tearing, burr, vein defective, is particularly useful for producing the pump housing, valve body moulding.
5. blow cores gas tail gas need not installed tail gas treatment device without specially treated.
6. die for making core available metal, plastics or timber are manufactured, the manufacturing cycle is short, and expense is low.
7. mould need not heat, so dimensional variations is little, and it is little to make the core dimensional discrepancy, thereby can improve casting dimension accuracy.
8. coremaking efficient height, applying flexible can be used for core production in enormous quantities, also can be used for the single and mini-batch production core and manufactures.
9. coremaking energy consumption is low.
The specific embodiment:
Embodiment 1:
Coremaking feeds absorption dehumidifying device with compressed air, and the dehumidifying back feeds the core making machine intake valve.Take by weighing the calibrating casting binder and put into the bowl-type puddle mixer, add m=2.5, M again with normal sand 2000g
2OmSiO
2Content is the Na waterglass 50g of 39% quality, and mixed 20s shakes out, and with the mixture adding Z861 core shooter blasting unit of sand and bonding agent, penetrates real standard " 8 " shape sample with the Z861 core shooter under 0.4-0.6Mpa, takes off blasting unit, and Sha Kou is penetrated in sealing.Open the gas generator magnetic valve, make the methyl formate air gas mixture of 50～60% content feed core box 10-15s.Close the gas generator magnetic valve, open the dry air magnetic valve, feed core box 5-15s after making dry air make temperature be heated to 30-100 ℃ through the gas generator heater, close the dry air magnetic valve, with cylinder core box is opened, take out " 8 " shape sample, with Swy type hydraulic universal strength-testing machine test sample tensile strength.The results are shown in Table 1.
Table 1
| Penetrate sand pressure MPa | Methyl formate | Blow air themperature ℃ | Blow air pressure MPa | Tensile strength MPa | ||
| ％ | Pressure MPa | Immediately | 24h | |||
| 0.55 | 45％ | 0.05 | 30 | 0.1 | 0.1～0.2 | 1.0～1.1 |
| 0.55 | 55％ | 0.05 | 30 | 0.1 | 0.2～0.3 | 1.1～1.4 |
| 0.55 | 65％ | 0.05 | 30 | 0.1 | 0.2～0.35 | 1.2～1.6 |
Embodiment 2. embodiment 3. embodiment 4
Embodiment 2, and embodiment 3, and embodiment 4 gets m=2.2 casting water glass 40g respectively, 50g, and 60g blows strong-willed body and adopts the air Mixture that contains methyl formate 50%, and other process conditions are with embodiment 1, and each technological parameter sees Table 2.
Table 2
| Embodiment is other | Normal sand (g) | Waterglass (g) | Tensile strength MPa | |
| Immediately | 24h | |||
| Embodiment 2 | 2000 | 40 | 0.15-0.2 | 0.5-0.6 |
| Embodiment 3 | 2000 | 50 | 0.2-0.3 | 0.9-1.2 |
| Embodiment 4 | 2000 | 60 | 0.25-0.35 | 1.0-1.5 |
Embodiment 5 embodiment 6 embodiment 7
Embodiment 5 adopts m=2.1 Na
+Glass
Embodiment 6 adopts m=2.1 Na
+95%K+5% waterglass.
Embodiment 7 adopts m=2.1 Na
+94.9%.K5% Li
+0.1% waterglass blows strong-willed body and adopts the air Mixture that contains methyl formate 50%, and other implementation conditions are with embodiment 1.Each technological parameter sees Table 3
Table 3
| Embodiment is other | M is other | Normal sand (g) | Waterglass (g) | Tensile strength MPa | |
| Immediately | 24h | ||||
| Embodiment 5 | Na + | 2000 | 50 | 0.2-0.3 | 1.2-1.4 |
| Embodiment 6 | Na +K + | 2000 | 50 | 0.2-0.4 | 1.2-1.3 |
| Embodiment 7 | Na +K +Li + | 2000 | 50 | 0.2-0.4 | 1.2-1.3 |
Embodiment 8, embodiment 9, embodiment 10, wash silica sand, chromite sand with water respectively, blow strong-willed body and adopt the air Mixture that contains methyl formate 50%, other process conditions are with embodiment 1.Each technological parameter sees Table 4.
Table 4
| Embodiment is other | Sand is other | Sand amount (g) | Waterglass (g) | Tensile strength MPa | |
| Immediately | 24h | ||||
| Embodiment 8 | The washing silica sand | 2000 | 50 | 0.2-0.3 | 1.2-1.4 |
| Embodiment 9 | Chromite sand | 2000 | 50 | 0.2-0.4 | 1.3-1.9 |
| Embodiment 10 | Zircon sand | 2000 | 50 | 0.2-0.4 | 1.3-2.0 |
Embodiment 11, embodiment 12, embodiment 13 adopt respectively to contain 50% methyl formate, Ethyl formate, and the air Mixture of methyl acetate is done blast gas, and other conditions are with embodiment 1, and each technological parameter sees Table 5.
Table 5
| Embodiment is other | Sclerosis gas | Normal sand (g) | Waterglass (g) | Tensile strength | |
| Immediately | 24h | ||||
| Embodiment 11 | Methyl formate | 2000 | 50 | 0.2-0.3 | 1.2-1.4 |
| Implement 12 | Ethyl formate | 2000 | 50 | 0.2-0.25 | 0.9-1.2 |
| Embodiment 13 | Methyl acetate | 2000 | 50 | 0.1-0.2 | 0.8-1.2 |
Embodiment 14, embodiment 15, embodiment 16,
Add modified water glass among the embodiment 14,15,16, modifier is respectively sugar, hydrogenated glucose, xylitol.Blow strong-willed body and adopt the air Mixture that contains methyl formate 50%, other process conditions are with embodiment 1.Each technological parameter is listed in table 6.
Table 6
| Embodiment is other | Modifier | Normal sand (g) | Waterglass (g) | Tensile strength MPa | ||
| Title | Addition (g) | Immediately | 24h | |||
| Embodiment 14 | Sugar | 5 | 2000 | 50 | 0.2-0.25 | 1.2-1.4 |
| Embodiment 15 | Hydrogenated glucose | 5 | 2000 | 50 | 0.2-0.28 | 1.0-1.2 |
| Embodiment 16 | Xylitol | 5 | 2000 | 50 | 0.2-0.3 | 1.2-1.5 |
Claims (10)
1, a kind of method of making core by blowing to harden cold-box, roughing sand is mixed, penetrates sand and offhand, blows and harden with bonding agent, make bonding agent with waterglass, it is characterized in that: gases used gaseous mixture for the organic ester of C2～C4 and air or nitrogen, organic ester accounts for 45～65% volumes of mist total amount, gassing time 10～15s.
2, according to the method for the described making core by blowing to harden cold-box of claim 1, it is characterized in that: after the air blowing, intermittently 5～20s is blown into air or nitrogen, time 5-15s again.
3, according to the method for claim 1 or 2 described making core by blowing to harden cold-box, it is characterized in that: organic ester accounts for 45～65% volumes of mist total amount.
4, by the method for claim 1 or 2 described making core by blowing to harden cold-box, it is characterized in that: described air or nitrogen are that dew point is lower than dry air or the nitrogen below-20 ℃.
5, by the method for claim 1 or 2 described making core by blowing to harden cold-box, it is characterized in that: described organic ester is any or multiple of methyl formate, Ethyl formate, methyl acetate.
6, by the method for claim 1 or 2 described making core by blowing to harden cold-box, it is characterized in that: described waterglass is casting water glass, consists of:
M
2OmSiO
2The 30-60% quality
H
2O 40-70% quality
M wherein
+Be Na
+, K
+, Li
+, Rb
+In one or more, m is 1.6～3.5.
7, by the method for the described making core by blowing to harden cold-box of claim 6, it is characterized in that: m is 2-3.
8, press the method for the described making core by blowing to harden cold-box of claim 6, it is characterized in that: described casting water glass adds modifier, modifier is selected from dextrin, sugar, molasses, xylitol, Sodium Polyacrylate, polyacrylamide, sodium phosphate trimer, cellulose, humic acid, sodium humate, resin, the hydrogenated glucose one or more, consists of:
Casting water glass 90.9% quality
Modifier 9.1% quality.
9, by the method for the described making core by blowing to harden cold-box of claim 8, it is characterized in that: m is 2-3.
10, press the method for claim 1 or 2 described making core by blowing to harden cold-box, it is characterized in that: coremaking is selected natural silica Sand, washing silica sand, selected silica sand, zircon sand, magnesia, sillimanite sand, aquamarine stone sand, forsterite sand for use with roughing sand, and mix material proportioning is:
Roughing sand 97.09-98.04% quality
Bonding agent 1.96-2.91% quality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133477 CN1255234C (en) | 2001-11-21 | 2001-11-21 | Method for making core by blowing to harden cold-box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133477 CN1255234C (en) | 2001-11-21 | 2001-11-21 | Method for making core by blowing to harden cold-box |
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| Publication Number | Publication Date |
|---|---|
| CN1419980A CN1419980A (en) | 2003-05-28 |
| CN1255234C true CN1255234C (en) | 2006-05-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101314175B (en) * | 2007-05-28 | 2010-09-08 | 洛阳双瑞特种装备有限公司 | Alkalescent phenol resin sand carbonic anhydride induration cold box core-manufacturing method and application thereof |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004042535B4 (en) * | 2004-09-02 | 2019-05-29 | Ask Chemicals Gmbh | Molding material mixture for the production of casting molds for metal processing, process and use |
| CN102085564B (en) * | 2009-12-02 | 2013-03-13 | 广西玉柴机器股份有限公司 | Curing gas blowing device and method for manufacturing core by using cold core box die |
| CN102189225B (en) * | 2011-03-23 | 2012-10-31 | 苏州明志科技有限公司 | Core making device with insulating gas blowing cover |
| BR112014001275B1 (en) * | 2011-07-19 | 2019-02-05 | Ask Chemicals L.P. | "cold box" process and apparatus for forming a cured molten form |
| DE102011115024A1 (en) * | 2011-10-07 | 2013-04-11 | Ask Chemicals Gmbh | Coating compositions for inorganic casting molds and cores comprising formic acid esters and their use |
| CN104439041A (en) * | 2014-10-20 | 2015-03-25 | 沈阳汇亚通铸造材料有限责任公司 | Core-making sand composition of warm core box and sand making method |
| CN110064727A (en) * | 2019-06-10 | 2019-07-30 | 沈阳汇亚通铸造材料有限责任公司 | A kind of ester solidification sodium silicate sand used for casting composition |
-
2001
- 2001-11-21 CN CN 01133477 patent/CN1255234C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101314175B (en) * | 2007-05-28 | 2010-09-08 | 洛阳双瑞特种装备有限公司 | Alkalescent phenol resin sand carbonic anhydride induration cold box core-manufacturing method and application thereof |
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|---|---|
| CN1419980A (en) | 2003-05-28 |
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Granted publication date: 20060510 Termination date: 20131121 |