WO2006082949A1 - 球状鋳物砂 - Google Patents
球状鋳物砂 Download PDFInfo
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- WO2006082949A1 WO2006082949A1 PCT/JP2006/301931 JP2006301931W WO2006082949A1 WO 2006082949 A1 WO2006082949 A1 WO 2006082949A1 JP 2006301931 W JP2006301931 W JP 2006301931W WO 2006082949 A1 WO2006082949 A1 WO 2006082949A1
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- Prior art keywords
- sand
- spherical
- weight
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- urethane binder
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Classifications
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- 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
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- 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
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12993—Surface feature [e.g., rough, mirror]
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Definitions
- a granular aggregate such as silica sand is mainly composed of a polyol compound and a polysiloxane compound.
- a binder composed of an organic solvent solution is mixed, and the resulting mixture is filled into a model and cured by a urethanization reaction catalyzed by tertiary amines to obtain a desired saddle shape.
- the cold box method or the urea self-molding method is widely known and implemented.
- the present invention relates to a spherical clay sand produced by a flame melting method having an average particle size of 0.03 to 1.5 mm and used with a urethane binder.
- the present invention relates to a spherical sediment sand having an average particle size of 0.03 to 1.5 mm and a water absorption of 0.5% by weight or less, which is used together with a urethane binder. To do.
- this invention relates to the manufacturing method of the cage
- the strength of the saddle is increased by increasing the amount of binder in order to prevent breakage (for example, core breakage) after the penetration. Since increasing the amount of binder leads to gas defects, the problem of gas defects becomes even more pronounced.
- the phenolic resin component and the polyisocyanate component are mixed, and then the vertical shape is cured by aeration of gaseous amine. However, before the amine is aerated, the urethanization reaction proceeds gradually. Then there is a risk of starting to cure. Therefore, the vertical composition stored in the sand hopper for a long time may not obtain the desired vertical strength, which may cause molding defects and requires cleaning in the sand hopper.
- the present invention has less gas defects, higher strength, no deformation or breakage, and smooth surface when manufacturing a saddle mold using a urethane binder, such as the cold box method or urethane self-hardening molding method.
- the present invention relates to a sand that can produce a bowl having good properties. Furthermore, in the cold box method, it relates to dredged sand with a longer pot life. According to the present invention, it is possible to greatly reduce the amount of gas generated, which is a problem of a forging method using an urethane binder, and it is possible to obtain a product with few gas defects.
- the spherical sand used in the present invention is roughly composed of two embodiments and is particularly suitable for cores.
- the first embodiment is spherical earth sand produced by a flame melting method having an average particle diameter of 0.03 to 1.5 mm.
- the second embodiment is spherical sand having an average particle size of 0.03 to 1.5 mm and a water absorption of 0.5% by weight or less.
- spherical sand which is the shape of the spherical sand of the present invention, means a sphericity of 0.88 or more, preferably 0.90 or more. From the viewpoint of manifesting the effects of the present invention, the sand with a sphericity of 0.95 or more is preferable.
- the sand is made of an optical microscope, a digital scope (for example, V H-8 00 0 type manufactured by Keyence Corporation), etc. Can be observed and judged.
- the main component of the spherical sand of the present invention is not particularly limited, and conventionally known refractories and refractory raw materials obtained by spheronization by the flame melting method are used.
- the main component M g O and S i 0 2 are particularly preferable.
- the “main component” means that the above components are contained in a total amount of 60% by weight or more in all the components of the sand.
- the total amount of these components is preferably 8 5 to 1 among all the components of the spherical sand.
- Fe 2 0 3 and Ti 0 2 When Fe 2 0 3 and Ti 0 2 are contained, their content is preferably 5% by weight or less. The content of F e 2 ⁇ 3 2. More preferably 5 wt% or less, 2 wt% or less is more preferred.
- K 2 0 and Na 2 0 When contained, their total content is preferably 3% by weight or less, more preferably 1% by weight or less.
- a 1 2 0 3 and S i 0 2 are the main components, the A 1 2 0 3 / S i 0 2 weight ratio is preferably 1 to 15. From the viewpoint of improving fire resistance and the efficiency of reclaiming sand, 1.2 to 12 is preferable, and 1.5 to 9 is more preferable.
- C a O and Mg 0 may be included as components other than the main components.
- the total content thereof is preferably 5% by weight or less.
- the weight ratio of MgOZS i 0 2 is from 0.1 to 1 0 are preferred. In view of easiness of spheroidization, corrosion resistance, fire resistance, and improvement of recycle efficiency of dredged sand, 0.2 to 9 is preferable, and 0.3 to 5 is more preferable.
- a 1 2 0 3 can be included as a component other than the main components. This originates from the raw material, but is it from the viewpoint of improving the corrosion resistance of spherical sand
- the content is preferably 10% by weight or less.
- the acid consumption (ml / 5 0 g) of the sand according to the present invention is preferably 10 (m 1 to 50 g) or less, more preferably 5 ( m 1 5 0 g) The acid consumption was measured by the method described in J ACT Test Method S-4.
- the dredged sand of the present invention has an elution strength of 1 mo 1 Zg or less, and further 0.8 mo 1 Zg or less, per 1 g of the dredged sand. It is preferable that The amount of alkali eluted is the amount of strong alkali extracted from dredged sand and measured as follows.
- Amount of elution Al (imo 1 / g) Titrate at neutralization point (ml) X 0. 1 X 5 0/2 5/50 X 1 0 0 0
- the value includes the amount of acid reacting with the sand surface.
- sand produced by the flame melting method is presumed to have many functional groups on the sand surface, and there were cases where the pot life was long even if the acid consumption was high.
- the content of Na 20 K 2 0 in the dredged sand composition is preferably 0.8% by weight or less, more preferably 0.5%, respectively. % By weight or less, more preferably 0.3% by weight or less.
- the Ca 0 content is preferably 1% by weight or less, more preferably 0.5% by weight or less.
- the containing chromatic amount of MgO preferably 1 wt% or less, more preferably 0.5 wt% or less der The By using these contents, it is possible to reduce the amount of acid consumption and the amount of alkali eluted, and to prevent shortening of the usable time.
- the thermal expansion coefficient of the spherical sand is preferably 0.2% or less. Urethane binders do not need to be heated at the time of curing, so it is possible to manufacture molds with higher dimensional accuracy, in particular cores. This is preferable because accuracy can be improved.
- the thermal expansion coefficient of the spherical sand can be controlled by adjusting the composition of the sand, the crystal structure, the ratio of the amorphous component, and the like.
- the thermal expansion coefficient of the sand is measured according to J ACT test method M-2.
- the maximum value of rapid thermal expansion at is defined as the coefficient of thermal expansion.
- the average particle diameter (mm) of the spherical sand is preferably in the range of 0.03 to 1.5 mm.
- a thickness of 0.03 mm or more is preferable because it does not require a large amount of binder for the production of the mold and can be easily regenerated as clay sand. 1. If it is 5 mm or less, it is preferable because the porosity becomes small and leads to improvement in dredging strength.
- spherical dredged sand When producing spherical dredged sand by the flame melting method, obtain dredged sand with high sphericity. It is preferable from the viewpoint.
- the thickness is preferably 0.07 to l mm, more preferably 0.07 to 0.5 mm, and still more preferably 0.07 to 0.35 mm.
- the average particle size of the spherical sand of the present invention is from 0.1 mm to 0.5 mm. Is preferred. From the viewpoint of enhancing both air permeability and saddle strength, the strength is preferably 0.1 mm to 0.5 mm, more preferably 0.1 mn! ⁇ 0.3 mm is preferred.
- the dredged sand of the present invention has an effect of extending the pot life compared with conventionally known dredged sand.
- the strength is reduced if the crushed sand, polyol component, and isocyanate component are kneaded and then left standing and then gashed.
- the rate of strength decrease is small, and in some cases the strength increases.
- the saddle type using the spherical sand of the present invention particularly the core, has a good filling property because the sand is spherical, and the surface of the saddle can be smoothed. Can be smooth.
- the average particle size is preferably 0.03 to lmm, more preferably 0.03 to 0.35mm, still more preferably 0.03 to 0.15mm, and 0.03. ⁇ 0.1 mm is particularly preferred.
- the average particle size of the spherical sand can be determined as follows.
- the diameter (mm) is measured when the sphericity is 1 from the projected particle cross section of the spherical earth sand particle, while the major axis diameter (mm) of the spherical earth sand particle is measured when the sphericity is 1
- the major axis diameter and minor axis diameter are defined as follows.
- the width of the particle that minimizes the distance between the parallel lines is called the minor axis diameter.
- the distance when a particle is sandwiched between two parallel lines perpendicular to the line is called the major axis diameter.
- the major axis diameter and the minor axis diameter of the spherical sand particles are obtained by using an optical microscope or a digital scope (for example, VH-800 model, manufactured by Kiens Corporation). It can be obtained by image analysis of the obtained image.
- the sphericity is obtained by analyzing the obtained image to obtain the area of the particle projection cross section of the particle and the perimeter of the cross section, and then [the area of the particle projection cross section (mm 2 ) Calculate the circumference of the perfect circle (mm)] / [perimeter of the particle projection cross section (mm)], and select any 50 spheres. Obtain the average value of the obtained values for each kind of sandstone particles.
- the spherical sand of the present invention preferably has a sphericity of 0.95 or more and 0.98 or more from the viewpoint of improving fluidity and the smoothness of the bowl-shaped surface. More preferred are those having 0.99 or more.
- the water absorption rate (% by weight) of the spherical earth sand according to the first aspect of the present invention is the suppression of the increase in the amount of resin used due to the absorption of the resin used during the manufacture of the sand mold inside the earth sand.
- the content is preferably 1% by weight or less, more preferably 0.5% by weight or less, more preferably 0.3% by weight or less, still more preferably 0.2% by weight or less, and 0.1% by weight. % Or less is particularly preferred.
- the water absorption rate can be measured according to the method of measuring the water absorption rate of JIS A1 109 fine aggregate.
- the water absorption of the spherical sand of the second embodiment of the present invention is 0.5% by weight or less. From the viewpoints of suppressing the increase in the amount of resin used due to the absorption of the resin used in the manufacture of the saddle shape into the sand and improving the strength of the saddle shape, it is preferably 0.3% by weight or less. % By weight or less is more preferable, and 0.1% by weight or less is more preferable.
- the water absorption rate of spherical sand is usually lower when the sand is prepared by the flame melting method and the same sphericity as compared with the sand prepared by a firing method other than the method. .
- the sphericity is preferably 0.95 or more, 0.9 It is more preferably 7 or more, more preferably 0.98 or more, and particularly preferably 0.99 or more.
- the water absorption is preferably 1% by weight or less, more preferably 0.5% by weight or less, more preferably 0.3% by weight or less, still more preferably 0.2% by weight or less, and particularly preferably 0.1% by weight or less.
- the details of the reason for the effect of extending the pot life, which is a problem specific to urethane binders, by using the spherical sand of the present invention for urethane binders are currently unknown, but are presumed as follows.
- the phenol resin component and the polyisocyanate component are mixed, and then the vertical shape is cured by aeration of gaseous amine.
- the urethanization reaction gradually There is a risk that it will progress and begin to cure.
- the polyisocyanate component has high reaction activity and reacts with moisture in the air in addition to the urethanization reaction.
- the isocyanate reaction may be accelerated by impurities on the sand surface. Since the spherical sand of the present invention has a low water absorption rate or is produced by a flame melting method and has a high degree of sphericity, the surface area of the sand is small, so the binder and the surface of the sand, especially This is because there is relatively little contact with impurities, and in the case of the same addition amount, the film thickness of the binder is large and the proportion of contact with moisture in the air is relatively small. It is inferred that the isocyanate, which is a component unique to the urethane pine, suppresses the reaction before the amine aeration.
- the binder film thickness can be increased with a low addition amount as compared with conventionally known sand, it is assumed that the above-described effect can be obtained without causing gas defects.
- the spherical sand of the present invention can be used alone or in combination with conventional well-known sand such as silica sand, refractory aggregates, and other conventionally known additives. Use it. If the spherical sand of the present invention is gradually added to the known sand, the desired effect of the present invention is exhibited depending on the amount added.
- the spherical sand of the present invention having the predetermined sphericity is preferably contained in an amount of 50% by weight or more, more preferably 80% by weight or more, the effect becomes remarkable.
- the fine sand of the mixture may contain fine powder of 0.1 1 mm or less, but from the viewpoint of improving strength, the fine sand of 0.0 1 mm or less is fine sand of the mixture. Of these, 0.1% by weight or less is preferable, and 0.05% by weight or less is more preferable.
- the spherical sand of the first aspect of the present invention is produced by the flame melting method.
- the spherical sand of the second aspect of the present invention can be produced by a known method such as a method of granulating and sintering, an electromelting method, etc.
- a known method such as a method of granulating and sintering, an electromelting method, etc.
- An example of the method for producing the spherical sand of the present invention by the flame melting method is a flame melting method as disclosed in Japanese Patent Application Laid-Open No. 20 00-2 0 25 5 7.
- refractory powder particles having an average particle size of 0.05 to 2 mm are used as starting materials, and the powder particles are dispersed in a carrier gas such as oxygen and melted in the following flame to form a spheroid.
- a carrier gas such as oxygen
- the flame used is produced by burning propane, butane, methane, natural liquefied gas, LPG, heavy oil, kerosene, light oil, pulverized coal, etc. with oxygen, or by ionizing N 2 inert gas.
- a plasma jet flame can be used. Further, from the viewpoint of improving the pot life, it is preferable to wash and dry before and / or after the treatment by the flame melting method.
- the spherical sand of the present invention is used together with a urethane binder.
- the urethane binder is a binder that uses a polyol compound (particularly phenol resin) and a polyisocyanate compound as a binder and hardens the mold by using their polyaddition reaction.
- the polyol compound in the urethane binder include conventionally known phenol resins and aliphatic polyols, and are not particularly limited.
- solvent-soluble benzyl ether type phenolic resin resol type phenolic resin, nopolac type phenolic resin obtained by adding and condensing phenols and aldehydes (preferably formaldehyde).
- aldehydes preferably formaldehyde
- Orthocresol-modified phenolic resins these modified phenolic resins, and mixtures thereof.
- These phenolic resins are generally dissolved in a solvent from the viewpoints of lowering viscosity, compatibility with the polyisocyanate component described later, coating properties on dredged sand, and dredged physical properties.
- the solution is preferably used in a state of about 30 to 80% by weight.
- the polyisocyanate compound in the urethane binder has two or more isocyanate groups in the molecule that can form a chemical bond between the sediments by polyaddition reaction with the active hydrogen of the above polyol compound.
- Specific examples of such compounds include aromatic, aliphatic or cycloaliphatic polyisocyanates such as diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate (hereinafter referred to as polymeric MDI).
- polymeric MDI polymethylene polyphenylene polyisocyanate
- these polyisocyanate compounds can be obtained by reacting with polyols such as polyether polyols and polyester polyols.
- Preborima, etc. with two or more isocyanate groups can be mentioned various known polyisobutyl Xia sulfonates, they may be used alone, or may be used in combination of two or more kinds.
- a solvent is used as a solvent, and it is dissolved in this organic solvent so that the concentration is about 40 to 90% by weight. It is preferable to use it as a solution.
- Solvents used for the above polyol compounds and polyisocyanate compounds are non-reactive with respect to polyisocyanate compounds and are used for solutes (phenolic resins or polyisocyanates) to be dissolved.
- organic solvents generally, a polar solvent for dissolving the phenol resin and a nonpolar solvent for dissolving the polyisocyanate compound in an amount that does not cause separation of the phenol resin are used in combination. Is preferred.
- Dipolar acid alkyl esters such as methyl ester mixture of dicarboxylic acid (DuPont; product name: DBE; mixture of dimethyl dartrate, dimethyl adipate and dimethyl succinate), rapeseed oil and the like as polar solvents for dissolving phenolic resin
- Methyl esters of vegetable oils such as methyl esters, esters of fatty acid monoesters such as ethyl oleate, ethyl palmitate, and mixtures thereof, for example, ketones such as isophorone, ethers such as isopropyl ether, Examples include ril alcohol.
- Non-polar solvents for dissolving the polyisocyanate compound in an amount that does not cause separation of the phenol resin include, for example, petroleum hydrocarbons such as paraffins, naphthenes, and alkyl benzenes. And Ivzol 150 (made by Idemitsu Oil Co., Ltd .; petroleum-based solvent), hyzol (made by Showa Shell Sekiyu Co., Ltd .; petroleum-based solvent), and the like.
- Examples of the inorganic solvent include alkyl gayates and hydrolysates thereof, and examples thereof include hydrolysis products of citrate esters such as methyl silicate, ethyl silicate, propyl silicate, and butyl silicate.
- the main components of a urethane binder are a polyol compound and a polyisocyanate compound, and may contain a solvent.
- the amount of urethane binder used (when solvent is included, the amount including the solvent) is 0% by weight with respect to 100 parts by weight of the sand containing the spherical sand of the present invention from the viewpoint of saddle strength. It is preferably 3 to 3 parts by weight, more preferably 0.3 to 2.2 parts by weight, and still more preferably 0.3 to 1.7 parts by weight.
- the urethane binder curing catalyst that can be used in the present invention is preferably a tertiary amine compound. For example, in the cold box molding method, triethylamine, dimethylethylamine, dimethyl n-propylamine, dimethylisopropylamine.
- a readily vaporizable compound such as ruamine is used in the form of gas or aerosol.
- 4-phenylpropylpyridine, ethylmorpholine, N-methylimidazole, etc. are used as is or in organic solvents. Those appropriately diluted with can be suitably used.
- the curing catalyst for urethane self-hardening molding method can be added and mixed in advance with the polyol compound component of the urethane binder.
- the amount of the curing catalyst used is 0.1 to 20 parts by weight relative to 100 parts by weight of the polyol compound in both the cold box molding method and the urethane self-hardening molding method. preferable.
- an organic solvent solution containing a polyol compound as a main component, and a polyisocyanate compound, or poly Add a binder composed of an organic solvent solution containing an isocyanate compound as a main component, stir and mix, fill the resulting mixture into a model, and then add the mixture to a gaseous or aerosol-like mixture.
- a binder composed of an organic solvent solution containing an isocyanate compound as a main component stir and mix, fill the resulting mixture into a model, and then add the mixture to a gaseous or aerosol-like mixture.
- an organic solvent solution mainly composed of a polyol compound, a polyisocyanate compound mainly composed of a polyol compound, a polyisocyanate compound, Alternatively, a binder composed of an organic solvent solution containing a polyisocyanate compound as a main component and a liquid tertiary amine as a curing catalyst are added, stirred and mixed, and the resulting mixture is filled into a model. And a method for producing a forging mold to be solidified.
- a conventionally known additive that is, a silane coupling agent, a disintegration improver, an odor reducing agent, a pot life extender, a stain, is appropriately used.
- Anti-sticking agents, strength improvers, etc. can be used.
- the amount of the silane coupling agent is preferably 0.01 to 10 parts by weight with respect to 100 parts by weight of the urethane binder from the viewpoint of disintegration.
- disintegration improvers include silicic acid esters, silica sols, organohalophosphates, phosphites, alkali metal oxyacid salts, and one metal selected from the group consisting of iron, copper, nickel, cobalt and zinc. And at least one metal oxide having an element.
- odor reducing agents include carboxylic acids such as fumaric acid, alkali metal salts, alkaline earth metal salts, and inorganic oxides.
- pot life extenders and methods include acid chlorides such as isophthalic acid chloride, phosphite esters, 2,2'-dipyridyl, 1,10-phenanthral A substituted alkyl derivative thereof, an aromatic compound such as catechol or pyrogallol, a boron compound such as boric acid, a binder composition having a divalent metal salt content of 5 O ppm or less, an epoxy resin and an acrylated organic polyisocyanate And a method of combining an oxidizing agent composed of a reactive unsaturated acrylic monomer, a polymer, and a mixture thereof, and hydroperoxide.
- acid chlorides such as isophthalic acid chloride, phosphite esters, 2,2'-dipyridyl, 1,10-phenanthral A substituted alkyl derivative thereof, an aromatic compound such as catechol or pyrogallol, a boron compound such as boric acid, a binder composition having a divalent metal salt content of 5 O pp
- anti-smudge agents include aliphatic monoisocyanates, urethane prepolymers obtained by reacting polyisocyanates and polyether polyols, polybutadienes, and modified polybutadienes having functional polybutadienes or phenolic hydroxyl groups. Etc.
- strength improvers include acid amides and urea derivatives.
- the saddle type having a thin wall portion of 5 mm or less, preferably 4 mm or less, especially the core has high fluidity and poor filling by using the spherical sand of the present invention. Can be prevented.
- the saddle mold having a thin portion of 5 mm or less represents a saddle mold in which the thickness of the narrowest portion of the mold after molding is 5 mm or less.
- the spherical cocoon sand of the present invention has a high sphericity and a high filling property, the cocoon-shaped surface becomes smooth, and the surface of the obtained cocoon, that is, the cocoon with a smooth skin is obtained.
- the saddle shape containing the spherical sand and urethane binder of the present invention preferably has a surface roughness R a of 20 m or less, more preferably 1 to 15 ⁇ . Ra can be measured by a surface assembly measuring instrument as in the examples described later.
- the bowl using the spherical sand of the present invention is spherical, it collapses easily after pouring, and the sand can be easily removed even with a bowl having a complicated shape.
- sand in an uncured part and an unnecessary part can be easily removed, so that it can be suitably used.
- the spherical sand of the present invention can be reused after the molding or after pouring.
- the regeneration treatment can be performed by a conventionally known method, mechanical treatment such as roasting treatment or interparticle friction type, water washing, pickling, alkali washing, solvent washing and the like.
- so-called reclaimed sand can be used again for the vertical molding of the present invention.
- the method for measuring the sphericity and water absorption rate of spherical sand is measured after removing the binder component as appropriate according to the binder type. For example, in the case of an organic binder, the organic content is removed at 100 ° C. for 1 hour, and then the sphericity and water absorption are measured.
- methods such as washing with water, pickling and washing with alkali are used.
- the core obtained by using the spherical sand of the present invention uses sand with high sphericity, so it has good air permeability, disappearance model forging method, full mold method, V process, suction forging.
- the core can be suitably used for a manufacturing method in a field where air permeability is required.
- the core can reduce the amount of gas generated, gas defects and crab defects occur in particular. It can also be suitably used for easy mold fabrication methods such as low pressure fabrication, high pressure fabrication, and die casting cores.
- the core of the present invention has the most complicated structure as a bowl, and can be used for those that require a beautiful skin surface and dimensional accuracy.
- FIG. 1 is a schematic view of the core used in the examples and comparative examples.
- FIG. 2 is a schematic view of the porcelain produced in the examples and comparative examples. Examples The following examples describe the practice of the present invention. The examples are illustrative of the invention and are not intended to limit the invention. The following shows the sand used in the examples and comparative examples. Table 1 shows the composition and physical properties of each.
- the composition obtained by the flame melting method is A 1 2 0 3 : 63.8 wt%, S i 0 2 : 3 0.2 wt%, Fe 2 0 3 : 1. 3 wt%, T i ⁇ 2 : 2.9% by weight, C a ⁇ : 0.3% by weight, MgO: 0.1% by weight, Na 2 0: 0.1% by weight, K 2 ⁇ : 0.1% by weight (pair
- the average particle size is 0.15 mm, the sphericity is 0.98, the water absorption is 0.02% by weight, and the acid consumption is 1.3 m 1/5 0 g. Spherical glaze sand.
- Spherical sediment sand obtained by the flame melting method which is different in composition and physical properties from the spherical sediment sand (1).
- Spherical powder particles with a diameter of 0.2 mm (total of 8 1 2 0 3 and ⁇ i 0 2 9 6% by weight) was obtained by firing in an electric furnace at 1,500 ° C. for 1 hour.
- the total content of A 1 2 0 3 and S i 0 2 is 97% by weight, A 1 2 0 3 / S i 0 2
- the weight ratio is 2, 7, the average particle size is 0.18 mm, and the sphericity is 0 8 9.
- Water absorption was 1.2% by weight, acid consumption was 1.6 m 1/50 g, particle density was 2.7 g / cm 3 .
- Table 1 Composition of dredged sand (% by weight) Average particle size Water absorption rate Acid consumption Elution alkali amount Sphericality
- the main mold was made of a self-curing mold using the same type of sand kneading sand as the core and using the same amount of phenol urethane binder as the urethane binder.
- This phenol urethane binder consists of an organic solvent solution of a polyol compound (trade name rPEPSET Part R, manufactured by Hodogaya Ashland Co., Ltd.), an organic solvent solution of a polyisocyanate compound (trade name “PEPSET Part M”, Made by Tsuchiya Ashland Co., Ltd.) and a curing catalyst [trade name “PEPSET Part 1”, made by Hodogaya Ashland Co., Ltd.]
- ⁇ means no gas defects
- ⁇ means 1 to 4 gas defects
- X means 5 or more gas defects.
- the amount of the urethane binder added is the amount relative to 100 parts by weight of the sand.
- the surface roughness measuring instrument (1) shows the smoothness of the surface of the cage made using the sand obtained in Example 2 and Comparative Example 1 and the surface of the cage made using the cage.
- Surface roughness [centerline average roughness: Ra (m)] was measured using a surf coder SE-30H) manufactured by Kosaka Laboratory. The smaller the Ra, the better the surface smoothness.
- the results are shown in Table 3 below. As shown in Table 3, when the sand of Example 2 was used, a sand mold with excellent surface smoothness was obtained compared with the case of using the sand of Comparative Example 1. It can be seen that the surface of the prepared porcelain is also excellent in smoothness.
- each was filled into a mold of 22 mm thickness x 22 mm width x 180 mm length, and 0.14 wt% of triethylamine was injected into the sand and vaporized. Then, it was aerated for 30 seconds to be cured and removed. Ten minutes after punching, the bending strength (bending strength) was measured with a GF bending tester (distance between fulcrums 150 mm). In addition, the strength reduction rate (%) was determined by [(Folding strength after 2 hours of kneading) / (Folding strength immediately after kneading)] X100.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/883,388 US7987892B2 (en) | 2005-02-02 | 2006-01-31 | Spherical casting sand |
CN2006800039293A CN101111332B (zh) | 2005-02-02 | 2006-01-31 | 球状型砂 |
EP06713074.0A EP1844877B1 (en) | 2005-02-02 | 2006-01-31 | Spherical molding sand |
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JP2005025872 | 2005-02-02 |
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US (1) | US7987892B2 (ja) |
EP (1) | EP1844877B1 (ja) |
CN (1) | CN101111332B (ja) |
WO (1) | WO2006082949A1 (ja) |
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WO2005113174A1 (ja) * | 2004-05-21 | 2005-12-01 | Kao Corporation | レジンコーテッドサンド |
US9637143B2 (en) | 2013-12-30 | 2017-05-02 | Nevis Industries Llc | Railcar truck roller bearing adapter pad systems |
US9216450B2 (en) * | 2011-05-17 | 2015-12-22 | Nevis Industries Llc | Side frame and bolster for a railway truck and method for manufacturing same |
CN102688979A (zh) * | 2012-06-26 | 2012-09-26 | 长沙南托造型材料有限公司 | 一种长保质期覆膜砂及其生产方法 |
WO2014066693A1 (en) | 2012-10-25 | 2014-05-01 | Kohler Co. | Engineered composite material and products produced therefrom |
US9758181B2 (en) | 2013-12-30 | 2017-09-12 | Nevis Industries Llc | Railcar truck roller bearing adapter pad systems |
US10358151B2 (en) | 2013-12-30 | 2019-07-23 | Nevis Industries Llc | Railcar truck roller bearing adapter-pad systems |
CN104525837A (zh) * | 2014-12-01 | 2015-04-22 | 繁昌县恒鑫汽车零部件有限公司 | 一种灰铸铁大件用手工型砂及其制备方法 |
CN106424536B (zh) * | 2016-10-12 | 2018-07-27 | 山东科技大学 | 无游离醛、游离酚的新型三乙胺冷芯盒铸造用粘结剂 |
CN108772532A (zh) * | 2018-06-19 | 2018-11-09 | 马鞍山市益丰实业集团有限公司 | 一种砂箱造型砂配方及制备工艺 |
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JP2001205386A (ja) * | 2000-01-28 | 2001-07-31 | Hodogaya Ashland Kk | 鋳型製造用粘結剤組成物、鋳型製造用組成物、および鋳造用鋳型の製造方法 |
JP2002113549A (ja) * | 2000-07-31 | 2002-04-16 | Hodogaya Ashland Kk | 気体状第三級アミン硬化性鋳型製造用粘結剤組成物、鋳型製造用組成物、及び鋳造用鋳型の製造方法 |
JP2004202577A (ja) * | 2002-12-09 | 2004-07-22 | Kao Corp | 球状鋳物砂 |
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CN1022094C (zh) * | 1990-09-30 | 1993-09-15 | 国营青岛电站阀门厂 | 铸造用型砂 |
KR100998461B1 (ko) | 2002-12-09 | 2010-12-06 | 카오카부시키가이샤 | 구상 주물사 및 그 제조방법 |
JP2004237288A (ja) | 2003-02-03 | 2004-08-26 | Toyota Motor Corp | 人工焼結砂およびその製造方法 |
JP4323187B2 (ja) | 2003-02-27 | 2009-09-02 | 旭有機材工業株式会社 | 鋳型用有機粘結剤及びこれを用いて得られる鋳物砂組成物並びに鋳型 |
JP4323223B2 (ja) | 2003-06-06 | 2009-09-02 | 旭有機材工業株式会社 | 鋳型用有機粘結剤及びこれを用いて得られる鋳物砂組成物並びに鋳型 |
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- 2006-01-31 CN CN2006800039293A patent/CN101111332B/zh active Active
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JP2001205386A (ja) * | 2000-01-28 | 2001-07-31 | Hodogaya Ashland Kk | 鋳型製造用粘結剤組成物、鋳型製造用組成物、および鋳造用鋳型の製造方法 |
JP2002113549A (ja) * | 2000-07-31 | 2002-04-16 | Hodogaya Ashland Kk | 気体状第三級アミン硬化性鋳型製造用粘結剤組成物、鋳型製造用組成物、及び鋳造用鋳型の製造方法 |
JP2004202577A (ja) * | 2002-12-09 | 2004-07-22 | Kao Corp | 球状鋳物砂 |
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Also Published As
Publication number | Publication date |
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CN101111332A (zh) | 2008-01-23 |
US7987892B2 (en) | 2011-08-02 |
EP1844877B1 (en) | 2017-11-01 |
CN101111332B (zh) | 2012-09-05 |
US20080138650A1 (en) | 2008-06-12 |
EP1844877A4 (en) | 2008-10-08 |
EP1844877A1 (en) | 2007-10-17 |
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