WO2005113174A1 - レジンコーテッドサンド - Google Patents
レジンコーテッドサンド Download PDFInfo
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- WO2005113174A1 WO2005113174A1 PCT/JP2005/009598 JP2005009598W WO2005113174A1 WO 2005113174 A1 WO2005113174 A1 WO 2005113174A1 JP 2005009598 W JP2005009598 W JP 2005009598W WO 2005113174 A1 WO2005113174 A1 WO 2005113174A1
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- sand
- resin
- spherical
- rcs
- weight
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/62665—Flame, plasma or melting treatment
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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
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- 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
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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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- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
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- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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Definitions
- the present invention relates to a resin-coated sand used for a molding die of steel, steel, aluminum, copper, and alloys thereof.
- the shell molding method is a molding method in which a resin-coated sand in which natural sand is coated with a phenolic resin or the like is filled in a preheated mold and heated and cured, and is widely used in the construction industry.
- Silica sand is widely used as an aggregate for resin-coated sand.Since sand is widely used, its shape is indeterminate and poor in fluidity. There are limits to what you can do.
- silica sand has a large thermal expansion, and there is a problem in terms of dimensional accuracy.
- Japanese Patent Application Laid-Open No. 2004-202577 discloses spherical sand produced by a flame melting method. And describes a type III method in which spherical sand, a furan resin, and an alkaline phenol resin are combined. Disclosure of the invention
- the present invention relates to a resin-coated sand obtained by coating spherical binder sand having an average particle diameter of 0.02 to 1.5 mm and produced by a flame melting method with a binder composition.
- the present invention also relates to a resin-coated sand obtained by coating a spherical sand having an average particle diameter of 0.2 to 1.5 mm and a water absorption of 0.5% by weight or less with a binder composition.
- the present invention provides a mold obtained by using the resin-coated sand of the present invention, a product produced by using the mold, and a method of producing a mold by using the resin-coated sand of the present invention. Also provide.
- the present invention also provides a use of the resin-coated sand used in the production of a mold. Detailed description of the invention
- An object of the present invention is to provide a resin-coated sand capable of producing a mold for production having excellent fluidity, high strength, and a smooth surface.
- the additive manufacturing method that has recently attracted attention is an additive manufacturing method.
- the resin-coated sand proposed in the conventional method is not sufficient in terms of the mold strength and the discharge property of uncured sand.
- Resin coated sand that can be suitably used in the method is desired.
- the present inventors have found that refractory particles having a specific component composition and particle size, having a large sphericity, and having a low water absorption due to their smooth surface.
- a resin-coated sand in which spherical sand is coated with a binder composition.
- the present inventor has found that this resin-coated sand is suitable for a mold material used for producing a steel product and a steel product having a high filling temperature.
- the resin sand which is excellent in fluidity
- INDUSTRIAL APPLICABILITY The resin-coated sand of the present invention can withstand entrainment at high temperatures and is suitably used for steel and steel. Further, the resin sand of the present invention has a low expansion property, prevents structural defects (such as vaning and type cracking) due to sand expansion in the product, and improves the dimensional accuracy of the complicated product. Can respond to requests.
- the present invention provides a resin coated sand suitable for a shell molding method. Furthermore, since the resin-coated sand of the present invention uses spherical green sand having a smooth surface, the resin-coated sand is excellent in sand discharging property, can cover the surface with a small amount of added resin, and has a good shape when formed into a ⁇ shape. Adhesion is formed and high ⁇ -shaped strength can be obtained. Therefore, a high-quality product can be manufactured with a small amount of resin decomposition gas generated at the time of charging. It is economical. Furthermore, the resin-coated sand of the present invention is excellent in fluidity, and can increase the filling of small details. In addition, the disintegration of type III after implantation is good. Due to its excellent properties, the resin sand of the present invention can be sufficiently replaced by expensive zircon sand and ceramic sand, which are used as special sand in a petroleum factory.
- Spherical sand> Spherical sand used in the resin-coated sand (hereinafter abbreviated as RCS) of the present invention mainly includes two modes.
- a first embodiment is a spherical sand produced by a flame melting method and having an average particle size of 0.02 to 1.5 mm.
- a second embodiment is spherical sand having an average particle size of 0.02 to 1.5 mm and a water absorption of 0.5% by weight or less.
- spherical sand The spherical sand of the present invention has a particular feature in that it has a specific component composition and an average particle diameter, and has a large sphericity. With such a configuration, it is possible to produce a mold for manufacturing having excellent fluidity, high strength and a smooth surface. In addition, the mold can be manufactured with a smaller amount of resin than before, and regeneration is easy.
- the spherical shape 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. Whether or not the particles are spherical is determined by, for example, using an optical microscope or a digital scope (for example, VH-800, manufactured by Keyence) as described in Examples below. Observe and judge.
- a refractory and a refractory raw material known in the art which are formed into a spherical shape by a flame melting method, are used without any particular limitation.
- these refractory and anti-fire feedstock from the viewpoint of fire resistance and Chasse of the availability, those mainly composed of S i 0 2, mainly composed of A 1 2 0 3 and S i O 2 things, 1 ⁇ that the ⁇ Oyobi 3 1 ⁇ 2 as a main component is preferable.
- a refractory, in view of thermal expansion, especially those composed mainly of A 1 2 ⁇ 3 and S i 0 2 is preferred.
- the “main component” means that the above components are 60% by weight in the total amount of the whole sand.
- the total amount of these components is It is preferably 85 to 100% by weight, more preferably 90 to 100% by weight, based on all components.
- spherical ⁇ sand present invention as components other than the main component is, for example, C aO, F e 2 ⁇ 3, T I_ ⁇ 2, K 2 0, ⁇ a 2 0 a metal such as Oxides. These are derived from the starting materials.
- F e 2 ⁇ 3 and T i 0 2 preferably 5 wt% or less, respectively as their content.
- the content of F e 2 0 3 is 2. More preferably 5 wt% or less, 2 wt% or less is more preferred.
- the total content thereof is preferably 3% by weight or less, more preferably 1% by weight or less.
- a 1 2 0 3 and S I_ ⁇ 2 weight ratio is from 1 to 1-5. From the viewpoint of improving fire resistance and the efficiency of regenerating sand, 1.2 to L2 is preferred, and 1.5 to 9 is more preferred.
- Ca ⁇ ⁇ and MgO may be included as components other than the main components. In that case, from the viewpoint of improving the fire resistance of the spherical sand, 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. From the viewpoints of spheroidization, corrosion resistance, fire resistance, and improvement in the regeneration efficiency of natural sand, 0.2 to 9 is preferable, and 0.3 to 5 is more preferable.
- the M G_ ⁇ and S i 0 2 as a main component may include A 1 2 ⁇ 3 as a component other than the main component. This is derived from the raw material, but it improves the corrosion resistance of spherical sand. From the viewpoint, the content is preferably 10% by weight or less.
- the average particle diameter (mm) of the spherical sand of the present invention is in the range of 0.02 to 1.5 mm.
- the thickness is 0.02 mm or more, preferably 0.05 mm or more, the amount of resin required for the production of a mold can be reduced, and it becomes easy to regenerate as sand.
- the thickness is 1.5 mm or less, the porosity of the ⁇ ⁇ ⁇ type is reduced, and the ⁇ type strength is improved, which is preferable.
- the thickness is preferably 0.05 to lmm, more preferably 0.05 to 0.5mm, and particularly preferably 0.05 to 0.35mm.
- the finally obtained RCS of the present invention preferably has the same range of the average particle diameter.
- the average particle size can be determined as follows. In other words, when the sphericity from the projected cross section of the spherical sand particles is 1, the diameter (mm) is measured. On the other hand, when the sphericity is 1, the long axis diameter of the spherical sand particles (mm) is measured.
- the short-axis diameter (mm) are measured to obtain (long-axis diameter + short-axis diameter) No.2, and for each of 100 spherical sand particles, the values obtained are averaged.
- the major axis diameter and the minor axis diameter are defined as follows. When a particle is stabilized on a plane and the projected image of the particle on the plane is sandwiched between two parallel lines, the width of the particle that minimizes the interval between the parallel lines is called the minor axis diameter. The distance between two parallel lines perpendicular to the line when the particle is inserted is called the major axis diameter.
- the major axis diameter and the minor axis diameter of the spherical sand particles are obtained by obtaining an image (photograph) of the particles by using an optical microscope or a digital scope (for example, VH-8000, manufactured by KEYENCE CORPORATION). Can be obtained by image analysis. Also, the sphericity is The obtained image is subjected to image analysis to determine the area of the particle projected cross section and the perimeter of the cross section of the particle, and then [the circumference of a perfect circle having the same area as the area (mm 2 ) of the particle projected cross section] Length (mm)] / [perimeter of particle projection cross section (mm)] is calculated, and the obtained values are averaged for any 50 spherical sand particles.
- the spherical sand of the present invention preferably has a sphericity of 0.95 or more, more preferably 0.98 or more, from the viewpoint of improving the fluidity of the RCS. More preferably, it is 0.99 or more.
- the finally obtained RCS of the present invention preferably has the same range of sphericity. Therefore, as the spherical shape ⁇ sand of the first aspect of the present invention, for example, eight 1 2 ⁇ 3 Oyobi 3 i 0 2 Ri name containing as a main component, A 1 2 0 3 S I_ ⁇ 2 weight ratio :!
- Spherical sand produced by a flame melting method having an average particle size of 0.02 to 0.5 mm and a sphericity of 0.95 or more is preferred.
- the spherical sand according to the first embodiment of the present invention is obtained by a flame melting method. Therefore, it has a structural characteristic of high sphericity and denseness. The structural characteristics greatly contribute to the improvement of fluidity, mold strength, and surface smoothness of the manufactured animal.
- the water absorption (% by weight) of the spherical sand of the present invention is determined by suppressing the increase in the amount of resin used due to the absorption of the resin used in the manufacture of the mold into the sand.
- the content is preferably 3% by weight or less, more preferably 0.8% by weight or less, further preferably 0.5% by weight or less, and particularly preferably 0.3% by weight or less.
- the water absorption can be measured according to the method for measuring water absorption of JISA 1109 fine aggregate. If RCS coated with a binder or binder residue after incorporation remains, the components are removed by an appropriate method such as heat treatment (for example, 100 or more). After removal, the water absorption is measured. On the other hand, the water absorption of the spherical sand according to the second embodiment of the present invention is 0.5% by weight or less.
- the content is preferably 0.3% by weight or less, and 0.1% by weight or less. % By weight or less is more preferable.
- the water absorption of spherical sand is generally lower when the sand is prepared by the flame melting method than when the sand is prepared by a firing method other than the above method, as long as the sand has the same sphericity. .
- the main component of the spherical ⁇ sand second aspect of the present invention is similar to the spherical ⁇ sand of the first aspect, refractory, from the viewpoint of thermal expansion, in particular A l 2 ⁇ 3 and S i is preferably one composed mainly of ⁇ 2, a 1 2 0 3 / S i ⁇ 2 weight ratio 1-1 5 are preferred.
- the sphericity of the spherical mineral sand of the present invention is 0.98 or more
- the spherical mineral sand is preferably contained in a mixture with a known fluid sand having low fluidity such as silica sand. volume
- the natural sand comprising the mixture can sufficiently exhibit the desired effects of the present invention. That is, if the spherical natural sand of the present invention is gradually added to the known natural sand as described above, the desired effect of the present invention will be exhibited according to the amount of the addition. If the spherical sand of the present invention having the predetermined sphericity is contained in the sand of 50% by volume or more, the effect becomes remarkable.
- the content of the spherical sand of the present invention having a sphericity of 0.98 or more in the sand of the mixture is more preferably 60% by volume or more, and still more preferably 80% by volume or more.
- the spherical sand of the present invention is particularly preferably a sand having a sphericity of 0.98 or more because of its excellent utilization. Also, is it possible that a sand containing 50% by volume or more of such spherical sand can exhibit the same effect as the spherical sand of the present invention? Thus, such sand is also included in the present invention.
- the spherical sand of the first embodiment of the present invention is produced by a 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 and an electro-fusion atomizing method. It is preferable to produce by the flame fusion method similarly to the spherical sand of the first embodiment. Therefore, an example of the method for producing the spherical sand of the present invention by the flame melting method will be described below.
- Spherical ⁇ sand of the present invention for example, eight 1 2 ⁇ 3 as a main component Oyobi 3 i ⁇ 2, A 1 2 0 3 / S I_ ⁇ 2 weight ratio of 0.9 to 1 7, the average Powder particles having a particle size of 0.05 to 2 mm can be obtained as a starting material by a production method including a step of melting the powder particles in a flame and spheroidizing them.
- the raw material as a raw material and S i 0 2 source as A 1 2 ⁇ 3 source as described below be made of a mixture of, (a 1 2 ⁇ 3 + S i 0 2) even those made from the material alone as source, also, a 1 2 ⁇ 3 source as a raw material contact and / or S i ⁇ 2 sources as the the raw material (a 1 2 ⁇ 3 + S i 0 2) may be a mixture of the raw material as a source.
- the content of the total amount of ⁇ 2, from the viewpoint of the total amount of A 1 2 ⁇ 3 and S i 0 2 in the resulting spherical ⁇ sand is made to be the 8 0 wt% or more in all components, preferably Is 7 5 % By weight, more preferably at least 80% by weight, still more preferably 85 to 100% by weight, particularly preferably 90 to 100% by weight.
- the A 1 2 0 3 / S i ⁇ 2 weight ratio, from the viewpoint of A 1 2 ⁇ 3 ZS i ⁇ 2 weight ratio in the resulting spherical ⁇ sand is set to be 1 to 1-5, 0.9 To 17 and preferably 1 to 15.
- the average particle size is 0.05 mm or more from the viewpoint of obtaining a monodispersed spherical sand, and 2 mm or less from the viewpoint of obtaining a sand having a desired sphericity. 0.05 to 2 mm to meet. Further, from the viewpoint of improving the sphericity of the obtained natural sand, 0.05 to 1.5 mm is preferable.
- a 1 2 0 3 / S i ⁇ 2 weight ratio differs between the spherical ⁇ sand obtained raw material powder particles, and the A 1 2 0 lost amount of 3 and lost weight S i ⁇ 2 by material Because they are different.
- the average particle size of the raw material powder particles may be in the above-mentioned range since the irregular-shaped powder becomes spherical and the particle size decreases, but the particle size of the originally spherical powder does not change.
- the powder particles as the starting material taking into account the component evaporation during melting, the A 1 2 ⁇ 3 ZS i ⁇ 2 weight ratio and the average particle size is within the above range Prepare and use as appropriate.
- the water content (% by weight) of the starting material is preferably 10% by weight or less and 3% by weight or less from the viewpoint of adjusting the water absorption and sphericity of the obtained spherical sand to an appropriate range. Is more preferable, and 1% by weight or less is further preferable. Water content Is measured by weight loss when 10 g of powder particles are heated at 800 ° C. for 1 hour.
- Starting materials can be selected, for example, from refractory mineral and synthetic raw materials.
- the raw material of the A 1 2 ⁇ 3 sources include Bokisai bets, alum shale, oxide ⁇ Rumi two ⁇ beam, aluminum hydroxide and the like.
- the raw material as the Si 2 source include silica stone, silica sand, quartz, cristobalite, amorphous silica, feldspar, and pyrophyllite.
- a raw material of the (A 1 2 0 3 + S i 0 2) source kaolin, alum shale, Bokisai DOO, mica, Shirimanai DOO, Andarusai DOO, mullite DOO, Zeorai DOO, montmorillonite preparative high port Sites and the like can be mentioned. These raw materials can be used alone or in combination of two or more.
- the selected starting material is preferably calcined to reduce its water content or to facilitate its melting. Examples of the calcined raw material powder particles include calcined bun page, calcined mullite, calcined bauxite, a mixture of calcined aluminum hydroxide and kaolin, and the like.
- the starting material as described above is dispersed in a carrier gas such as oxygen and injected into a flame to be melted and spheroidized.
- a carrier gas such as oxygen
- Perform flame fusion method. In a preferred embodiment, it is charged into the following flame.
- the flame used is propane, butane, methane, natural liquefied gas, LPG, heavy oil, kerosene
- the ratio of fuel to oxygen is preferably from 1.01 to 1.3 in terms of volume ratio from the viewpoint of complete combustion.
- an oxygen gas burner is preferable.
- the structure of the burner is not particularly limited, Japanese Patent Application Laid-Open Nos. Hei 7-418118 and Hei 11-1132
- the burners disclosed in JP-A-421, JP-A-2000-205523 or JP-A-2000-346318 are exemplified.
- the following method is suitable for spheroidizing the refractory raw material powder having a large average particle size in the range of 0.05 to 2 mm used in the production method of the present invention.
- the introduction of powder particles into the flame is carried out by dispersing in a carrier gas.
- Oxygen is preferably used as the carrier gas.
- the oxygen of the carrier gas can be consumed for fuel combustion.
- Powder concentration in the gas from the viewpoint of securing sufficient dispersibility of the powder particles, preferably 0. 1 ⁇ 20 k gZNm 3, 0. 2 ⁇ : 1 0 k gZNm 3 is more preferable.
- the shape and composition of the raw material powder particles from the viewpoint of quickly performing spheroidization in a flame and obtaining a monodispersed spherical sand.
- the ratio of the major axis to the minor axis of the raw material powder particles is preferably 9 or less, more preferably 4 or less, More preferably, it is 2 or less.
- the composition from the viewpoint of obtaining monodispersed spherical particles which are not fused, it is particularly preferred that A 1 2 ⁇ 3 / S i 0 2 weight ratio is from 1.5 to 10.
- the powder particles can be suitably melted and spheroidized even in a plasma jet flame generated by ionizing N 2 inert gas or the like.
- the particle density (g / cm 3 ) of the spherical sand of the present invention is preferably in the range of 1 to 3.5 gZ cm 3 .
- the particle density is preferably in the range of 2.5 to 3.5 gZcm 3 . In this range, a solid, dense and high-strength ⁇ type can be obtained.
- the particle density is preferably in the range of 1 to 2.5 g / cm 3 . Those in this range are porous and have a space inside, so that a lightweight ⁇ type can be obtained.
- the particle density can be measured according to the particle density measurement method of JISR 1620.
- the spherical sand of the present invention preferably has a fire resistance of SK 17 (1480 ° C) or more, has a low thermal expansion property, and more preferably has a fire resistance of 1800 ° C or more.
- the above is more preferred.
- the upper limit is not particularly limited, but is preferably SK42 (2000) or less. This fire resistance was measured according to the Zegelkon method based on JISR2204.
- the spherical sand of the present invention has a smaller surface area than a granular aggregate having a polygonal surface, a porous aggregate having a porous surface, or a spherical aggregate having a poor sphericity. Can cover the surface.
- a granular aggregate having a polygonal surface a porous aggregate having a porous surface
- a spherical aggregate having a poor sphericity Can cover the surface.
- the surface of the limestone sand is smooth, good adhesion is formed even with a small amount of resin, and a high lipstick strength can be obtained.
- the RCS of the present invention is obtained by coating the above spherical sand of the present invention with a binder composition.
- the binder composition used in the present invention contains a resin, and if necessary, a disintegration accelerator and a lubricant. Agents, silane coupling agents, curing agents and the like.
- the resin is not particularly limited as long as it has a property of maintaining the mutual binding of the green sand at the time of pouring and breaking down the mutual bonding of the green sand after the pouring.
- the resin used in the present invention include a phenol resin, a urea resin, a melamine resin, an unsaturated polyester resin, an epoxy resin, a diaryl phthalate resin, a polyurethane resin, and a silicone resin. Examples thereof include resin, polyimide resin, and furan resin, but are not particularly limited thereto. Of these, a phenolic resin such as a novolak resin or a resol resin is preferable.
- a metal with a high pouring temperature for example,
- the temperature at the time of pouring is usually from 130 to 160). Even at this temperature, it is particularly preferable to use a resin having the above properties.
- the resin is preferably a resin that is solid at the time of being put into a mold, has a property of melting by the action of heating or the like, and has a property of binding the organic sand to each other.
- the melting point and solid content of the resin are set so that the fusion point (J-catch test method I-1) of the obtained RCS is 50 to 200: and then 80 to L20. It is preferred to adjust and coat.
- the content of the resin is 10 to 100% by weight, more preferably 50 to 98% by weight, particularly 60 to 90% by weight in the total solid content. preferable.
- a conventionally known disintegration accelerator may be contained.
- examples thereof include oxides of metals such as cobalt and nickel, various nitrates, phosphorus compounds, boric compounds such as triethyl borate and tributyl borate, and carboxylate salts.
- the lubricant calcium stearate, ethylene bisstearate A mid or the like can be used.
- the resin is a phenol resin
- 0.2 to 7 parts by weight of the lubricant is contained with respect to 100 parts by weight of the phenol resin. It is preferable in view of the strength of the mold obtained by the shell mold method.
- silane coupling agent ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -aminopropyltriethoxysilane and the like can be used.
- the silane coupling agent when the resin is a phenol resin, the silane coupling agent is contained in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the phenol resin. This is preferred from the viewpoint of the strength and disintegration of the obtained ⁇ type.
- a curing agent is added to the binder composition, especially hexamethylenetetramine for phenol resin. May be contained.
- the content of hexamethylenetetraamine is preferably 5 to 20 parts by weight based on 100 parts by weight of the phenol resin from the viewpoint of type III disintegration.
- the amount of the binder composition to be used in the present invention may be any amount as long as the amount of the resin in the composition is the minimum amount necessary for binding spherical sand. In other words, an amount that does not impair the disintegration after loading is used.
- the amount of the resin added is preferably 3 to 0.5 part by weight, more preferably 2.5 to 0.5 part by weight, per 100 parts by weight of the spherical sand of the present invention. 5 parts by weight.
- the method for coating the spherical sand of the present invention with a binder composition is not particularly limited, and examples thereof include a conventionally known dry hot method, semi-hot method, and cold method.
- the amount of resin to be coated can be reduced.
- the ihot method is preferred.
- the components of the binder composition may be used as a one-part composition containing all the components, or may be used separately.
- a procedure similar to the dry hot method according to the JACT resin coated sand manufacturing operation standard of the Association for the Promotion of Construction Technology can be mentioned. That is, when a binder composition containing a phenol resin is used as the resin, the sand of the present invention is heated at a temperature of 130 to 160, and the binder composition is added thereto. The binder composition (the resin in the composition) is melted by kneading.
- the temperature is lowered from 100 to 110 ° C, and a hardening agent such as hexamethylenetetramine, paraformaldehyde, and trioxane is added as an aqueous solution, for example, and further kneaded and solidified to coat the resin with the resin sand. Then, further kneading disintegrates into single particles to obtain the RCS of the present invention. It is preferable to add the lubricant at the stage where the kneaded material has begun to disintegrate into single particles after the hardener is added. In the case of a resole resin, a curing agent is not necessarily required, and RCS coated with the resin of the present invention can be obtained by simply heating.
- a hardening agent such as hexamethylenetetramine, paraformaldehyde, and trioxane is added as an aqueous solution, for example, and further kneaded and solidified to coat the resin with the resin sand.
- the RCS of the present invention can be used as a mold material for producing an animal. Furthermore, the RCS of the present invention uses spherical sand with a smooth surface, so that the surface can be covered with a small amount of added resin. To produce high-quality products with a low amount of resin decomposition gas generated at the time of filling, excellent fluidity, and high filling of mold details. It is possible to manufacture a hollow core, and it is particularly suitable for manufacturing a hollow core.
- the RCS of the present invention can be used to produce a core such as a core having a particularly thin portion with high productivity. It has a thin part with a wall thickness of 5 mm or less, preferably 4 mm or less. Among them, the core has high fluidity and can prevent poor filling.
- the “ ⁇ ” having a thin portion of 5 mm or less refers to a “ ⁇ ” in which the thickness of the narrowest portion of the ⁇ after molding is 5 mm or less.
- the surface roughness Ra is preferably 20 m or less, and more preferably 1 to 15 tm. Ra can be measured by a surface roughness measuring instrument described in Examples described later.
- the shell core used in the construction has the problem of degassing at the time of incorporation when used as a solid body, or reduction in the amount of RCS used, improvement in workability by reducing the weight of the core, and removal of sand from the construction product.
- a hollow core may be manufactured, that is, a hollow core may be manufactured.
- the core is hollowed out by filling the heated core with RCS, heating the core to form a hardened outer layer of the required thickness, and then discharging the uncured RCS inside. be able to.
- the method of discharging the uncured RCS inside is to invert the mold and drop the RCS by gravity (inverted sand removal method), and in addition to this, apply vibration to accelerate the RCS drop (vibration discharge).
- a product having a surface roughness Ra of preferably 8 m or less, more preferably 5 m or less can be obtained. It is suitably used for copper, steel, steel, aluminum, copper, magnesium and alloys thereof. Since the present invention can reduce the amount of resin added, It is suitable for copper, aluminum, magnesium, etc., which are severe against gas defects, because the amount of gas generated from the gas can be reduced. Ra can be measured by a surface roughness measuring instrument described later in Examples.
- the animal of the present invention can also be used for those having the most complicated structure and requiring the beauty and dimensional accuracy of the skin surface.
- animals include members and parts used for hydraulic valves, motors, dies, engine frames, machine tools, construction members, and the like of construction machines.In particular, piping parts, fins, and the like are used. Examples include complex motor parts (casings), pump parts that require smoothness (such as impellers), and parts for drive transmission devices.
- the mold forming method using the RCS of the present invention is generally a shell mold method, but other thermosetting mold molding methods are also included, and the shell mold method is preferable. That is, the RCS of the present invention is thermosetting sand for green molding, and is particularly suitable as shell sand for molding.
- the sand of the present invention is spherical and has a smooth surface, RCS made using the sand of the present invention has high fluidity, which may cause poor filling and breakage of a mold having a more complicated shape. Can be prevented. Further, the spherical sand of the present invention can cover its surface with a small amount of resin, and when a mold is made from RCS, good adhesion is formed and high mold strength is obtained. As described above, the spherical sand and RCS of the present invention can be used alone or obtained from conventionally known sand such as silica sand and fire-resistant aggregates.
- RCS and conventionally known additives and the like can be appropriately mixed and used.
- the additive manufacturing method for example, see Table 2
- the RCS conventionally provided in the additive manufacturing method is obtained by coating a binder sand on a natural sand, but the shape of the RCS is irregular due to the irregular shape of the natural sand.
- a large amount of resin is required to obtain the mold strength after curing, and there is a problem that a gas defect is caused when a foreign matter is introduced into the obtained mold.
- spherical synthetic sand is used for RCS, but the conventional synthetic sand has insufficient sphericity, and the smoothness of the surface cannot be said to be sufficient. ⁇
- a large amount of resin was required to obtain the mold strength. After the additive manufacturing, it is necessary to discharge the RCS in the uncured portion, but the flowability of the RCS for discharging was inadequate for complex ⁇ .
- the RCS of the present invention can solve these problems.
- the average particle size of the spherical sand used in the additive manufacturing method is as follows. If the particle size of the sand is too large, the surface unevenness of the sand layer is so large that the accuracy of the mold cannot be obtained. If it is too small, the surface irregularities in the sand layer can be reduced, but when kneading the organic sand and the binder composition to coat the binder composition, uniform kneading becomes difficult. From the viewpoint that the emission of generated gas becomes extremely poor at times, it is 0.02 to 1.5 mm, preferably 0.02 to 1 mm, more preferably 0.04 to '0.08, and 0.04 to 0.08. ⁇ 0.07 is particularly preferred.
- the average particle size of spherical sand is 0.02 to 1.5 mm. It is preferable that the diameter distribution is narrow.
- the thermal expansion property of the spherical sand is low. . This suppresses thermal expansion when the spherical sand is heated by the irradiation of heat rays, thereby increasing the accuracy of the molded mold. Also, during fabrication, distortion due to thermal deformation of the molded sand and core This is because cracking can be suppressed.
- a spraying step of spraying the RCS of the present invention to form a thin sand layer, and an irradiation step of irradiating the sand layer with heat rays to cure the binder composition are performed.
- the molding can be performed by laminating in the thickness direction.
- the binder composition melts and then thermosets, bonding adjacent sand. Therefore, the resin in the binder composition is a thermosetting type such as a phenol resin.
- the laser beam used in the irradiation process for example, C 0 2 laser, can choose YAG laser or the like, the visible, may be invisible any laser beam.
- the resin has a fusion temperature of RCS of 100 or more.
- the uncured layer of sand is discharged. Instead, the cavity is backed up with sand that is not coated with the binder composition. Even in the method of completing the advanced curing, the shape of the RCS is close to a true sphere and the amount of the coated binder composition is small, so that the uncured RCS is excellently discharged.
- the ⁇ type produced from the RCS of the present invention since the ⁇ type produced from the RCS of the present invention has high strength, the amount of resin added for obtaining the same strength can be reduced. Therefore, it is economical and can be efficiently regenerated when reused as natural sand. Furthermore, the mold obtained by the RCS of the present invention eliminates mold cracking, vaning, and seizure after embedding. In addition, since the surface is smooth, the surface of the obtained product is smooth, and a product having a small load in a polishing process as a subsequent process can be obtained. In addition, the ⁇ ⁇ type can be easily collapsed by vibration or the like after pouring. Brief Description of Drawings
- FIG. 1 is a diagram schematically illustrating the additive manufacturing method performed in Example 5 and the like.
- FIG. 2 is a diagram schematically showing a mold obtained by the lamination molding method performed in Example 5 and the like.
- FIG. 3 is a schematic diagram showing a method for evaluating sand discharge performance performed in Example 5 and the like.
- FIG. 4 is a diagram schematically showing a core manufacturing mold used in Example 6 and the like.
- FIG. 5 is a diagram schematically illustrating a core manufacturing method performed in Example 6 and the like.
- FIG. 6 is a schematic diagram illustrating a method for evaluating sand discharge performance performed in Example 6 and the like.
- the present invention product 1 In the natural sands of Table 1, the present invention product 1, the baked mullite sand, and the electrofused sand were each obtained by the following methods.
- a 1 2 0 3 / S I_ ⁇ 2 weight ratio 2. mixing aluminum hydroxide and force Orin so as to be 7, spherical powder particles using a spray drier (A 1 2 0 3 and S I_ ⁇ 2 was contained in a total amount of 96% by weight in an electric furnace at 1,500 for 1 hour to obtain spherical sand (fired mullite sand in Table 1).
- the raw material of synthetic particles containing alumina and silica is melted in an arc furnace, eluted at a temperature of 160 Ot to 2200, and then subjected to air atomization to form a spherical sand (electroforming method shown in Table 1). Sand).
- CS was manufactured. Specifically, after heating the sand at 150, the phenolic resin (AV Light, Asahi Organic Materials Industry Co., Ltd.) was added at 1.0 parts by weight to 100 parts by weight of the sand. And kneaded. Next, the temperature was lowered to 105 ° C., and at this temperature, an aqueous solution of hexamethylenetetramine (hardening agent) (concentration: 18% by weight) was added to 100 parts by weight of natural sand. 0.83 parts by weight (in terms of solid content, 0.15 parts by weight sound was added and kneaded, and further kneaded while blowing cold air. In addition, calcium stearate (lubricant) was added to improve fluidity. Was added and mixed with 100 parts by weight of natural sand to obtain RCS.
- phenolic resin AV Light, Asahi Organic Materials Industry Co., Ltd.
- Example 2 after the RCS of Example 1 was molded by a shell method to obtain a mold, sand subjected to roasting treatment at 100 ° C. for 30 minutes was used as regenerated roasted sand. .
- Comparative Example 4 0.8 parts by weight of the phenol resin and 0.66 parts by weight of the aqueous hexamethylenetetramine solution (concentration: 18% by weight) were used for 100 parts by weight of the mineral sand. was manufactured as described above.
- the amount of the phenolic resin per unit volume of RCS was reduced to be the same as in Example 1 and the like.
- a test piece for bending force was baked at 25 Ot :, 90 seconds using RCS. Flexural strength was measured according to JIS K_6910 method. The density of this test piece is also shown in Table 3.
- the coefficient of thermal expansion at 1 000 was measured using a thermal expansion measuring instrument.
- the sphericity was measured by RCS photographing with a microscope and image analysis.
- the fluidity was measured using a JISK 167 2 1 bulk specific gravity measuring instrument, taking an RCS of 100 Om in one cup, and putting this 100 m 1 RCS into the Kaza specific gravity measuring instrument. Evaluation was made by measuring the flow time. Table 1
- Phenol resin 1.0 part by weight Hexamethylenetetramine 0.15 part by weight Water 0.67 part by weight Calcium stearate 0.05 part by weight
- the RCS of the present invention has high fluidity and can fill finely shaped portions well when molding a mold. This is presumed to be due to the high sphericity and the smooth surface of the spherical sand of the present invention.
- Example 1 has higher flexural power than the RCSs of Comparative Example 3. Further, even in comparison with Comparative Example 3, it can be seen that Example 1 has a smaller amount of resin per volume for developing equivalent bending force, which is more advantageous. For this reason, the amount of gas generated at the time of filling can be reduced, and gas defects of rust can be reduced. This is considered to be an effect derived from the fact that the spherical sand of the present invention has a high sphericity and a smooth surface, so that a small amount of resin can realize a sufficient square strength.
- Examples 3 and 4 and Comparative Examples 5 and 6 RCS coated with resin in the same manner as in Example 1 using the natural sands of Table 1 and the molds obtained by using the composition of Table 4 were obtained.
- Test was performed. First, the test core was fired at 250 for 90 seconds using RCS. The test core was set in a separately molded main mold, and a molten metal of about 147 iron (FC200) was poured. After cooling down (after leaving for 2 hours from the end of the cooling), type III cracks were observed. After that, the ⁇ type was collapsed by the core knock, and the core surface was observed for vaning and baking. The results are shown in Table 4. In Table 4, “ ⁇ ” of type II crack means that there is no type II crack, and “X” means that type II crack has occurred.
- ⁇ in the vaning means that there is no baining
- ⁇ means that a little baking has occurred
- X means that the baining has occurred
- ⁇ in the baking indicates that there is no baking
- X indicates that baking has occurred.
- Example 4 50 50 0 o ⁇ ⁇
- Example 6 0 0 100 ⁇ ⁇ ⁇ Example 5 and Comparative Examples 7, 8
- RCS was manufactured by the following method and evaluated by the following method. Table 6 shows the results
- spherical spherical sand of the product 2 of the present invention in Table 5 obtained by the production method (flame melting method) and the mullite sand B of the firing method of Table 5 obtained by the firing method were used.
- RCS was produced in the same manner as in Example 1 and the like, except that the components shown in Table 6 were used in these organic sands in the amounts shown in Table 6.
- phenolic resin B is a phenolic resin of the novolak type
- the fusion temperature of RCS is 110. The fusion temperature was measured based on JACT test method C-11 (fusion point test method).
- Example 2 The same method as in Example 1 was used for the bending force.
- a light-shielding mask is installed above the sand layer, and an irradiation step of irradiating heat rays through the light-shielding mask with an electric heater is performed.
- the resin in the area of the sand layer that has been directly irradiated with the heat rays is thermoset and bonds the sand particles together to form a solidified layer.
- the binder composition in the non-irradiated area of the sand layer that has not been irradiated with heat rays is uncured.
- Such a spraying step and an irradiation step are alternately repeated to laminate the solidified layer in the thickness direction.
- Laminate about 50 sheets Type II having a cylindrical cavity with a diameter of 30 mm and a depth of 30 mm shown in Fig. 2 was prepared.
- the obtained ⁇ was inverted and the uncured RCS in the cylindrical cavity was discharged by gravity from the uncured portion having a diameter of 10 mm, and the weight (A) of the discharged RCS was measured. Thereafter, the mold was cracked and the weight (B) of the uncured RCS remaining inside was measured.
- 100 XAZ (A + B) was defined as sand removal (%) (Fig. 3).
- the product 2 of the present invention is obtained by manipulating the distribution of particle size using a sieve. Assuming that the total sand is 100%, those having a particle size of 50 m or more and 75; Approximately 60%, and those of 75 m or more and less than 100 zm were about 40% by weight. From this, it is considered that the particle size range of the product 2 of the present invention is 50 to 100 m. Table 6 Example 5 Comparative Example 7 Comparative Example 8
- Phenol resin B heavy 2.0 2.0 4.0
- Example 5 compared with Comparative Examples 7 and 8, the sand-removing property was higher, and the uncured RCS could be easily discharged. It can be easily presumed that discharge is easy even by vibration and suction.
- Example 6 and Comparative Examples 9, 10 RCS was manufactured by the following method and evaluated by the following method. The results are shown in Table 7
- RCS The product 1 of the present invention shown in Table 1 and calcined mullite sand were used.
- RCS was produced in the same manner as in Example 1 and the like, except that the components shown in Table 7 were used in these natural sands in the amounts shown in Table 7.
- phenol resin ⁇ is the same as in Example 5 and the like.
- a mold split mold having a cylindrical cavity with an inner diameter of 50 mm and a depth of 50 mm shown in Fig. 4 was heated to 250, and the cavity was filled with RCS from an opening with a diameter of 10 mm. It was baked for 30 seconds (Fig. 5).
- the RC S is slightly hardened by the heat of the mold near the opening, so after opening the opening with a drill with a diameter of about 10 mm, the mold is inverted and the uncured RC inside the 10 mm diameter hole is removed. S is discharged by gravity, and the weight of the discharged RC S (
- the RSC in the uncured portion can be easily discharged.
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Abstract
Description
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Priority Applications (3)
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KR1020067017524A KR101131363B1 (ko) | 2004-05-21 | 2005-05-19 | 레진 코티드 샌드 |
EP05743632.1A EP1757382B1 (en) | 2004-05-21 | 2005-05-19 | Resin coated sand |
US11/597,057 US7951454B2 (en) | 2004-05-21 | 2005-05-19 | Resin-coated sand |
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JP2004-152509 | 2004-05-21 | ||
JP2004152509 | 2004-05-21 | ||
JP2005-032999 | 2005-02-09 | ||
JP2005032999 | 2005-02-09 |
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WO2005113174A1 true WO2005113174A1 (ja) | 2005-12-01 |
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PCT/JP2005/009598 WO2005113174A1 (ja) | 2004-05-21 | 2005-05-19 | レジンコーテッドサンド |
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US (1) | US7951454B2 (ja) |
EP (1) | EP1757382B1 (ja) |
KR (1) | KR101131363B1 (ja) |
WO (1) | WO2005113174A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070270524A1 (en) * | 2006-05-18 | 2007-11-22 | Kerns Kelley J | Composition of matter and method of application for elimination of odors in shell sand encapsulation |
CN102310157A (zh) * | 2011-10-13 | 2012-01-11 | 李华山 | 一种泥芯型砂的配比 |
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EP2272603B1 (en) * | 2008-04-30 | 2017-09-20 | Kao Corporation | Method for producing mold |
JP5355805B1 (ja) * | 2013-02-19 | 2013-11-27 | 伊藤忠セラテック株式会社 | 鋳型用耐火性粒子の改質方法及びそれによって得られた鋳型用耐火性粒子並びに鋳型の製造方法 |
JP6191076B2 (ja) * | 2014-03-12 | 2017-09-06 | 三菱重工業株式会社 | 中子の製造方法、及び該中子の製造方法によって中子を取得するタービン部材の製造方法 |
CN104588567A (zh) * | 2014-12-01 | 2015-05-06 | 繁昌县恒鑫汽车零部件有限公司 | 一种震击造型背砂及其制备方法 |
CN105414488B (zh) * | 2015-12-23 | 2017-10-27 | 常州中车汽车零部件有限公司 | 一种涡轮壳流道芯的制芯方法 |
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CN107042285B (zh) * | 2016-11-29 | 2018-10-19 | 常州中车汽车零部件有限公司 | 一种涡轮壳流道泥芯的制造方法 |
EP3626691A4 (en) | 2017-05-19 | 2021-03-17 | AGC Ceramics Co., Ltd. | MATERIAL FOR MOLDING, FUNCTIONAL INGREDIENT, MOLDED PRODUCT AND PRODUCT |
CN113400649B (zh) * | 2021-06-30 | 2023-07-04 | 山东威高骨科材料股份有限公司 | 一种解决3d打印peek材料零件热变形的方法 |
CN114799037B (zh) * | 2022-04-20 | 2024-03-26 | 北京仁创砂业铸造材料有限公司 | 一种抗脉纹覆膜砂及其制备方法 |
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JP3115510B2 (ja) * | 1995-05-30 | 2000-12-11 | 花王株式会社 | 鋳型成型用組成物 |
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KR20060052187A (ko) * | 2004-11-02 | 2006-05-19 | 카오카부시키가이샤 | 세라믹스 입자 |
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- 2005-05-19 US US11/597,057 patent/US7951454B2/en not_active Expired - Fee Related
- 2005-05-19 WO PCT/JP2005/009598 patent/WO2005113174A1/ja active Application Filing
- 2005-05-19 EP EP05743632.1A patent/EP1757382B1/en not_active Expired - Fee Related
- 2005-05-19 KR KR1020067017524A patent/KR101131363B1/ko active IP Right Grant
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JP2000024750A (ja) * | 1998-07-13 | 2000-01-25 | Toyota Motor Corp | 積層造形用レジン被覆砂及びそのレジン被覆砂を用いる積層造形方法 |
JP2003251434A (ja) * | 2002-02-28 | 2003-09-09 | Yamakawa Sangyo Kk | 鋳型用砂及びその製造方法 |
JP2004202577A (ja) | 2002-12-09 | 2004-07-22 | Kao Corp | 球状鋳物砂 |
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US20070270524A1 (en) * | 2006-05-18 | 2007-11-22 | Kerns Kelley J | Composition of matter and method of application for elimination of odors in shell sand encapsulation |
CN102310157A (zh) * | 2011-10-13 | 2012-01-11 | 李华山 | 一种泥芯型砂的配比 |
Also Published As
Publication number | Publication date |
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EP1757382A4 (en) | 2008-04-02 |
KR20070018012A (ko) | 2007-02-13 |
US7951454B2 (en) | 2011-05-31 |
EP1757382B1 (en) | 2016-04-20 |
US20080274374A1 (en) | 2008-11-06 |
EP1757382A1 (en) | 2007-02-28 |
KR101131363B1 (ko) | 2012-04-04 |
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