CN101293271A - Method for making core with aeration ossification - Google Patents
Method for making core with aeration ossification Download PDFInfo
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- CN101293271A CN101293271A CNA2007100110834A CN200710011083A CN101293271A CN 101293271 A CN101293271 A CN 101293271A CN A2007100110834 A CNA2007100110834 A CN A2007100110834A CN 200710011083 A CN200710011083 A CN 200710011083A CN 101293271 A CN101293271 A CN 101293271A
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Abstract
The invention discloses a core making method by gas-blowing hardening, which is characterized in that the mass percentage of mixing materials of the making core sand is as follows: 0.9-7.0 percent of soluble glass, 0.1-1.0 percent of moisture absorption resistant agent and raw sand for the rest; the used moisture absorption resistant agent can be triacetyl glycerine, diacetin, glycerol mono acetate bulk, diethylene glycol acetic ester, propylene glycol acetic ester, other polylol organic acid ester or the mixture thereof; the volume percentage of the blowing gas for hardening is as follows: 25-100 percent of C2-C4 organic ester and 0-75 percent of C1-C2 alcohols. The method of the invention has no toxicity and odor in production process, and the produced cores have better stripping strength.
Description
Technical field
The present invention relates to foundry engieering, provide a kind of sclerosis of blowing to prepare the method for core especially.
Background technology
The quality of the binding agent that in Foundry Production, adopts and its core manufacturing craft direct relation foundry goods, Foundry Production power, work situation, production cost reaches the influence to ecological environment.Past, Foundry Works adopted the coremaking of clay-bonded sand oven drying method, adopted vegetable oil afterwards, close the lipid thermosetting substance and do core binder, core is consolidation by hand, working condition is abominable, must put into stove baking ability sclerosis in several hours after the molding, power consumption is high, the production cycle is long, core easily produces distortion, and the breakage rate height influences casting quality during carrying.After World War II finishes, shell core, hot box technology put it over, shell core, hot box adopt thermoset synthetic resin to make binding agent, core is subjected to heat cure in mould, the core sclerosis is fast, and the coremaking quality is good, coremaking efficient height, realize the production of the mechanization in enormous quantities of core, progressively replaced the baking core manufacturing craft.The triethylamine cold-box process has been invented by nineteen sixty-eight Ashland company, realized the core cold(-)setting, mould normal temperature is operation down, has eliminated the influence of mold hot distortion to the core size, coremaking efficient height, dimensional discrepancy be little, save energy consumption, labour intensity is low, and this technology is still extensive use at present.
The shortcoming of this technology is: binding agent is nitrogenous, the alloy-steel casting of nitrogen pore sensitivity is used be restricted.As: various carbon steels, alloy steel casting; Catalytic gas is various amine (dimethyl amines, triethylamine, trimethylamine, and composition thereof), and is poisonous, penetrating odor arranged.
Along with the concern of the whole world to ecological environment, poisonous, have the flavor binding agent use will progressively be restricted.For improving the influence of coremaking to ecological environment.Alkaline phenol formaldehyde resin methyl formate method, acrylates CO
2Method, alkaline phenol formaldehyde resin CO
2Method is successively come out, and has solved to blow that strong-willed body is poisonous the flavor problem, but has all failed thoroughly to solve on the technology or the problem that exists in the environmental protection.Use waterglass to make binding agent in the invention of Chinese invention patent ZL97105026.0 and ZL01133477.0, the sclerosis gas that uses is air or air and C
2～C
4The mixture of ester has been accomplished nontoxic, low smell substantially.But above binomial invention exists molding intensity on the low side, and at wet weather, the sand core strength loss is big, influences it and applies, and needs further perfect.
Summary of the invention
The object of the present invention is to provide a kind of method of making core with aeration ossification, this method is nontoxic in process of production, odorlessness, and the product core of being produced has better molding intensity.
The invention provides a kind of core-making method of the sclerosis of blowing, it is characterized in that:
---the mass percent of used coremaking sand compound is:
Roughing sand 92～99%;
Waterglass 0.9～7.0%;
Anti-hygroscopic agent 0.1～1.0%;
Anti-hygroscopic agent wherein is triacetyl glycerine, two acetoglycerides, acetoglyceride, diethylene glycol acetate, propane diols acetate, other polyalcohol organic acid esters or its mixture;
---usedly blow strong-willed body percent by volume and be:
C
2～C
4Organic ester 25～100%;
C
1～C
2Alcohol 0～75%;
Air, carbon dioxide or nitrogen are as vector gas.
The present invention blows in the core-making method of sclerosis, and used roughing sand is selected from the washing silica sand, cleans silica sand, selected silica sand, Reshaping Silica Sand, zircon sand, chromite sand, forsterite sand, mound sand, regenerating used sand.Especially wash silica sand, perhaps the reclaimed sand of its waterglass ester curing or waterglass air blowing hardening process old sand.
The present invention blow the sclerosis core-making method in, used waterglass is the casting water glass that meets standard JB/T8835, meets the novel waterglass of casting of standard Q/HYT.01.Especially be selected from S103, S102, the novel waterglass of S101, S106 casting.
The method of making core with aeration ossification of the present invention adds anti-hygroscopic agent in the sand compound, core still can guarantee to have tensile strength more than the 0.3Mpa at rainy wet season.
The continuous muller of sand mixture available standards of the present invention or batch (-type) puddle mixer mix system.Mould can adopt common cold-box mould, and gas generator adopts the inferior logical FXS gas generator of making of Shenyang remittance.
Coremaking of the present invention can be used the manual method consolidation, also can adopt core shooter to penetrate real moulding.Be blown into sclerosis gas then, the time that is blown into sclerosis gas is 1～120s; Intermittently 1～10s, be blown into 30～120 ℃ of hot-airs of air blowing temperature, carbon dioxide or nitrogen 10～150s again, open box afterwards and get core.
Used C in the making core with aeration ossification method of the present invention
2-C
4Organic ester preferably be selected from methyl formate, Ethyl formate, ethyl ester methyl esters any or multiple, the most frequently used be methyl formate.
The anti-hygroscopic agent that the present invention adopts preferably is selected from triacetyl glycerine, propane diols acetate, diethylene glycol acetate and composition thereof.
Making core with aeration ossification method of the present invention has following advantage:
1, coremaking waterglass is inorganic binder, the source is wide, low price, nontoxic, tasteless, the coremaking cost is low, help improving working conditions and preserving the ecological environment.
2, compare with amine gas, sulfur dioxide, ester class, alcohols gas be nontoxic, have no irritating odor.
3, harmful element such as nonnitrogenous in the adhesive system, sulphur, phosphorus helps guaranteeing casting quality.
4, Zhi Bei core moisture resistance is good, and in the relative humidity 95% above environment, 24h sample tensile strength is greater than 0.3Mpa.
5, do core with sodium silicate binder, suitable thermoplasticity is arranged during cast, can prevent that foundry goods from producing hot tearing.Be casing, valve body, the first-selected technology of pump housing steel-casting.
6, air blowing gas, nonpoisonous and tasteless, tail gas treatment device need not be installed, save equipment investment.
7, die for making core available metal, plastics or timber are manufactured, and the manufacturing cycle is short, and expense is low.
8, 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.
9, the flexibility of coremaking is good, not only can adopt core making machine to realize castings production in enormous quantities, also can be used for the production that manual core making is used for the single and mini-batch production foundry goods.
10, energy consumption is saved in coremaking, and old sand can regeneration.
The specific embodiment:
Embodiment 1:
Take by weighing the calibrating casting binder and put into ST195 type cement mortar mixer with normal sand 1200g, add the ZS2.50 casting water glass 30g that meets the JB/T8835 standard, triacetyl glycerine 3g, stirring 60s shakes out, above-mentioned mixed sand compound is added in the Z861 core shooter blasting unit, under 0.4～0.6Mpa air pressure, penetrate real standard " 8 " shape sample with the Z861 core shooter, take off blasting unit, Sha Kou is penetrated in sealing, open FXS gas generator magnetic valve, make to contain methyl formate 60%, ethanol 40%, volume of air accounts for 30% of sclerosis mist, feeds core box 10～30s, close sclerosis gas source of the gas, intermittently 3s opens and blows the hot-air air valve, feeds 50～100 ℃ of hot-air 60～80s, after air blowing finishes, stop air feed, open core box, take out " 8 " shape sample.With SWY type hydraulic pressure strength testing machine, survey instant tensile strength of " 8 " sample and indoor placement 24h and survey tensile strength, list table 1 in.
Embodiment 2, embodiment 3, embodiment 4, embodiment 5, embodiment 6, embodiment 7, embodiment 8 get respectively and meet standard JB/T8835, ZS2.90 casting water glass and meet standard Q/HYT.01 standard casting with novel waterglass S101, S102, S103, S104, S105, S106, other conditions are identical with embodiment 1, and the gained detected intensity is listed table 1 in.
The different waterglass of table 1 are to the influence of mechanical property
Embodiment 9, embodiment 10, embodiment 11, embodiment 12, embodiment 13, embodiment 14, embodiment 15, embodiment 16, embodiment 17, embodiment 18, implementation procedure is identical with embodiment 1, adopt waterglass to be S103, the sclerosis carrier gas is a nitrogen, nitrogen accounts for sclerosis gas volume percentage implementation condition and lists table 2 in, the condition that excludes is identical with embodiment 1, blows hard sample and surveys instant and 24h tensile strength respectively, and list the result in table 2.
The different air hardening gases of table 2 influence mechanical property
Embodiment 17, embodiment 18, embodiment 19, embodiment 20, embodiment 21, embodiment 22, embodiment 23, embodiment 24, implementation procedure is identical with embodiment 1, and adopting waterglass is S101, and addition is 30g, blowing strong-willed body is methyl formate 50%, ethanol 20%.Carrier is an air, air blowing temperature and gassing time are listed table 3 in, the condition that excludes table 3 is identical with embodiment 1, and embodiment 17, embodiment 18, embodiment 19, embodiment 20, embodiment 21, embodiment 22, embodiment 23, embodiment 24 " 8 " the sample mechanical property of surveying are listed table 3 in.
The different air blowing temperature of table 3 are to the influence of mechanical property
Embodiment 25, embodiment 26, embodiment 27, embodiment 28, embodiment 29, embodiment 30, implementation procedure is identical with embodiment 1, and the waterglass addition sees Table 4 among the embodiment, and other conditions are identical with embodiment 1, and the mechanical property of " 8 " word sample sees Table 4.
Table 4 waterglass addition is to the influence of mechanical property
Embodiment 31, embodiment 32, embodiment 33, embodiment 34, embodiment 35, embodiment 36, embodiment 37, embodiment 38, embodiment 39, implementation procedure is identical with embodiment 1, add S101 waterglass 30g, anti-hygroscopic agent adding condition sees Table 5, other conditions of blowing hard sample are identical with embodiment 1, put into the drier of relative humidity 95～100% after sample blows firmly, and temperature is 30～35 ℃ in the drier, place 24h, survey tensile strength and list table 5 in.
Comparative Examples 40
Implementation procedure is identical with embodiment 1, adds S101 waterglass 30g, does not add anti-hygroscopic agent, and other conditions are identical with embodiment 31-embodiment 35, and the tensile strength of surveying is listed table 5 in.
Table 5 adds the influence of anti-hygroscopic agent to mechanical property under super-humid conditions
Embodiment 41, embodiment 42, embodiment 43, embodiment 44, embodiment 45, embodiment 46, embodiment 47, embodiment 48, embodiment 49, the roughing sand of employing are respectively the washing silica sand, clean silica sand, selected silica sand, Reshaping Silica Sand, zircon sand, chromite sand, forsterite sand, mound sand, selected silica sand, ester sodified water glass sand regenerating used sand.The adding condition sees Table 6, implementation procedure, and other implementation conditions are identical with embodiment 1, blow hard back " 8 " sample mechanical property and list table 6 in.
Embodiment 50
The sand compound is pressed embodiment 1 condition and is implemented, with sand compound pack into manual air blowing " 8 " shape sample core box, manual consolidation, strickling, compress the air blowing plate, open FXS gas generator magnetic valve, make and contain methyl formate 60%, ethanol 40%, volume of air and account for 30% of sclerosis mist, feed core box 10～30s, close sclerosis gas source of the gas, intermittently 3s opens and blows the hot-air air valve, feeds 50～100 ℃ of hot-air 60～80s, after air blowing finishes, stop air feed, open core box, take out " 8 " shape sample.With SWY type hydraulic pressure strength testing machine, survey instant tensile strength of " 8 " sample and indoor placement 24h and survey tensile strength, list table 6 in.
The different roughing sand of table 6 influence the sample mechanical property
Claims (9)
1, a kind of core-making method of the sclerosis of blowing is characterized in that:
---the mass percent of used coremaking sand compound is:
Roughing sand 92～99%;
Waterglass 0.9～7.0%;
Anti-hygroscopic agent 0.1～1.0%;
Used anti-hygroscopic agent is triacetyl glycerine, two acetoglycerides, acetoglyceride, diethylene glycol acetate, propane diols acetate, other polyalcohol organic acid esters or its mixture;
---usedly blow strong-willed body percent by volume and be:
C
2～C
4Organic ester 25～100%;
C
1～C
2Alcohol 0～75%.
2, according to the core-making method of the described air blowing sclerosis of claim 1, it is characterized in that: air, carbon dioxide or nitrogen account for 5～40% of sclerosis gas volume amount as vector gas.
3, according to the core-making method of the described air blowing sclerosis of claim 2, it is characterized in that: air, carbon dioxide or nitrogen account for 25～35% of sclerosis gas volume amount as vector gas.
4, according to the core-making method of the described air blowing sclerosis of claim 1, it is characterized in that: used roughing sand is selected from the washing silica sand, cleans silica sand, selected silica sand, Reshaping Silica Sand, zircon sand, chromite sand, forsterite sand, mound sand, regenerating used sand.
5, the core-making method of blowing and hardening according to claim 4, it is characterized in that: roughing sand is selected from the washing silica sand, perhaps the reclaimed sand of its waterglass ester curing or waterglass air blowing hardening process old sand.
6, according to the core-making method of the described air blowing sclerosis of claim 1, it is characterized in that: used waterglass is the casting water glass that meets standard JB/T8835, meets the novel waterglass of casting of standard Q/HYT.01.
7, the core-making method of blowing and hardening according to claim 6 is characterized in that: coremaking is selected from S 103, S 102, S 101, the novel waterglass of S 106 castings with waterglass.
8,, it is characterized in that organic ester is selected from any or multiple of methyl formate, Ethyl formate, ethyl ester methyl esters according to the blow core-making method of sclerosis of claim 1.
9, the core-making method of blowing and hardening according to claim 8 is characterized in that being methyl formate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100110834A CN101293271A (en) | 2007-04-24 | 2007-04-24 | Method for making core with aeration ossification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100110834A CN101293271A (en) | 2007-04-24 | 2007-04-24 | Method for making core with aeration ossification |
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| Publication Number | Publication Date |
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| CN101293271A true CN101293271A (en) | 2008-10-29 |
Family
ID=40063955
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|---|---|---|---|
| CNA2007100110834A Pending CN101293271A (en) | 2007-04-24 | 2007-04-24 | Method for making core with aeration ossification |
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| CN102248130A (en) * | 2011-06-17 | 2011-11-23 | 河南豫兴铸造有限公司 | Manufacturing process of core assembly for butterfly valve body |
| CN102380582A (en) * | 2011-12-02 | 2012-03-21 | 苏州明志科技有限公司 | Cold core making method |
| CN103588490A (en) * | 2013-10-11 | 2014-02-19 | 铜陵市经纬流体科技有限公司 | Anti-moisture absorption CO2 gas blowing hardened water glass sand and preparation method thereof |
| CN103624208A (en) * | 2012-08-25 | 2014-03-12 | 天津湶钰冒口有限公司 | Hot core box molding technology of riser for casting |
| CN103857480A (en) * | 2011-10-07 | 2014-06-11 | Ask化学品股份有限公司 | Coating compositions for inorganic casting molds and cores, comprising formic acid esters, and use thereof |
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