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WO2014098129A1 - Sable enrobé, procédé de fabrication de celui-ci et procédé de fabrication d'un moule - Google Patents

Sable enrobé, procédé de fabrication de celui-ci et procédé de fabrication d'un moule Download PDF

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Publication number
WO2014098129A1
WO2014098129A1 PCT/JP2013/083903 JP2013083903W WO2014098129A1 WO 2014098129 A1 WO2014098129 A1 WO 2014098129A1 JP 2013083903 W JP2013083903 W JP 2013083903W WO 2014098129 A1 WO2014098129 A1 WO 2014098129A1
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WO
WIPO (PCT)
Prior art keywords
mold
coated sand
water
water glass
sand
Prior art date
Application number
PCT/JP2013/083903
Other languages
English (en)
Japanese (ja)
Inventor
田中　雄一郎
Original Assignee
旭有機材工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 旭有機材工業株式会社 filed Critical 旭有機材工業株式会社
Priority to JP2014553179A priority Critical patent/JP6193884B2/ja
Priority to EP13864998.3A priority patent/EP2937160A4/fr
Priority to CN201380067209.3A priority patent/CN104903023B/zh
Publication of WO2014098129A1 publication Critical patent/WO2014098129A1/fr
Priority to US14/706,296 priority patent/US20150231691A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
    • B22C1/188—Alkali metal silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening

Definitions

  • the present invention relates to a coated sand, a method for producing the same, and a method for producing a mold, and more particularly, a dry coated sand having fluidity at room temperature, a method for producing the sand, and a casting using such a coated sand.
  • the present invention relates to a method for manufacturing a casting mold.
  • thermosetting resin such as phenol resin, which is an organic binder among these binders. Clarified in JP 2009-90334 A.
  • the manufacturing method disclosed therein after filling the resin-coated sand into the mold, the temperature of the resin-coated sand is raised by blowing water vapor into the mold, and then the heated gas is poured into the mold.
  • the target mold is manufactured by blowing into the mold to evaporate the condensed water in the mold and heating the resin-coated sand binder to a temperature at which it is solidified or cured.
  • JP 2012-76115 A as a binder, water glass, sodium chloride, sodium phosphate, sodium carbonate, vanadium are used to obtain a binder-coated refractory (coated sand) having good fluidity.
  • a water-soluble inorganic compound selected from the group consisting of sodium oxide, sodium borate, sodium aluminum oxide, potassium chloride and potassium carbonate, the surface of the refractory aggregate in a solid coating layer containing this water-soluble inorganic compound A caking refractory coated with a binder is proposed.
  • a coating layer made of a water-soluble inorganic compound such as water glass or sodium chloride is formed on the surface of the refractory aggregate as a solid coating layer.
  • a water-soluble inorganic compound such as water glass or sodium chloride
  • the present invention has been made in the background of such circumstances, and the problem to be solved is a dry coated sand having excellent room temperature fluidity and an advantageous production method thereof, Another object of the present invention is to provide a method for producing a mold having excellent characteristics by using such coated sand, and another object is to provide a mold used for mold making into a mold cavity. It is an object of the present invention to provide a coated sand, a method for producing the same, and a method for producing a casting mold using such a coated sand, in which the filling property can be remarkably improved and the strength of the obtained mold can be further enhanced. .
  • the present invention can be suitably implemented in various aspects as listed below, and each aspect described below is adopted in any combination. Is possible. It should be noted that aspects or technical features of the present invention are not limited to those described below, and can be recognized based on the inventive concept that can be grasped from the description of the entire specification. Should be understood.
  • a water glass aqueous solution is mixed as a binder to the heated refractory aggregate, and the moisture is evaporated to form a coating layer of the binder on the surface of the refractory aggregate.
  • a coated sand characterized in that it is a dry coated sand having room temperature fluidity and is adjusted so that its moisture content is 0.5% by mass or less.
  • the aqueous water glass solution is an aqueous solution of an alkali metal silicate.
  • water glass is used as the binder, and the aqueous solution is applied to the refractory aggregate.
  • the adhesive formed on the surface of such a refractory aggregate is used. Since the coating layer of the binder is configured as dry coated sand in which moisture is evaporated and the total moisture content is 0.5% by mass or less, the fluidity of the coated sand is further improved. This can be further improved, and the filling property of the coated sand into the mold cavity of the mold for mold making can be remarkably improved, so that a healthy mold having excellent mold strength is advantageously produced. It became possible.
  • the present invention by reducing the amount of lumps in the coated sand, it is possible to further increase the strength of the mold obtained using such coated sand, and further, an aqueous water glass solution.
  • water glass with high concentration can be used as a water glass aqueous solution diluted with water, and the water glass is efficiently and evenly formed on the refractory aggregate.
  • the coated sand according to the present invention is prepared by mixing a water glass aqueous solution as a binder with a heated refractory aggregate and evaporating water from the mixture, in other words, the water glass aqueous solution.
  • a dry coating layer made of water glass, which is a binder is formed on the surface of the refractory aggregate, is in a dry state, and has good room temperature fluidity
  • adjustment is made so that the moisture content of such coated sand is 0.5% by mass or less, preferably 0.3% by mass or less. It has been done.
  • the lower limit of such a moisture content is so good that it approaches 0 infinitely.
  • the coated sand provided with the water glass coating layer in a dry state having a very low moisture content and no moisture, it became a smooth state, and an effective room temperature fluidity was imparted.
  • it is possible to effectively improve the filling property of the coated sand into the mold cavity of the mold for mold making, and it is possible to advantageously obtain a healthy mold.
  • it can contribute to the improvement of mold strength.
  • the coated sand according to the present invention is desirably a composite particle in which a plurality of particles are produced in the production process, and is preferably a low content of so-called lumps, and is generally extracted from the production process.
  • the amount that could not pass through the 20 mesh sieve in other words, the amount of lumps on the 20 mesh sieve was 3% by mass or less, more preferably 1% by mass with respect to the total amount of the coated sand. % Or less is recommended.
  • the amount of lumps in the coated sand increases, the filling ability of the mold for molding the mold into the molding cavity deteriorates, and in addition to the problem that a defective mold is likely to be generated, Further improvement is difficult to achieve.
  • the refractory aggregate constituting such a coated sand is a refractory substance that functions as a base material of a mold, and any of various refractory granular materials conventionally used for molds is used. Specifically, silica sand, recycled silica sand, special sand such as alumina sand, olivine sand, zircon sand, chromite sand, and slag such as ferrochrome slag, ferronickel slag, converter slag, etc. Artificial particles such as system particles, alumina particles, and mullite particles, and regenerated particles thereof; alumina balls, magnesia clinker, and the like.
  • refractory aggregates may be fresh sand, or reclaimed sand or recovered sand that has been used once or a plurality of times as a casting sand for casting molds. Even mixed sand made by adding new sand to sand or recovered sand and mixing them can be used.
  • Such a refractory aggregate generally has a particle size of about 40 to 80 in AFS index, and preferably has a particle size of about 60 or less in order to facilitate the ventilation and drying of water vapor during mold molding. As a thing, it will be used.
  • the water glass used as the binder is a soluble silicate compound, and is preferably an aqueous solution of an alkali metal silicate, such as sodium silicate, silicate.
  • an alkali metal silicate such as sodium silicate, silicate.
  • examples include potassium, sodium metasilicate, potassium metasilicate, lithium silicate, ammonium silicate, colloidal silica, and alkyl silicate. It is also possible to use a mixture of a plurality of alkali metal silicates.
  • the alkali metal silicates those having a silicon dioxide / alkali metal oxide molar ratio of 1.0 or more and less than 3.0 are desirable.
  • sodium silicate sodium silicate
  • sodium silicate sodium silicate
  • Such sodium silicates are usually classified and used as commercial products according to the molar ratio of SiO 2 / Na 2 O as No. 1 to No. 5 types.
  • sodium silicate No. 1 has a SiO 2 / Na 2 O molar ratio of 2.0 to 2.3
  • sodium silicate No. 2 is SiO 2 / Na 2 O The molar ratio is 2.4 to 2.5
  • sodium silicate No. 3 has a SiO 2 / Na 2 O molar ratio of 3.1 to 3.3.
  • sodium silicate No. 4 has a SiO 2 / Na 2 O molar ratio of 3.3 to 3.5
  • sodium silicate No. 5 has a SiO 2 / Na 2 O molar ratio. Is 3.6 to 3.8.
  • sodium silicate Nos. 1 to 3 are also defined in JISK1408. These sodium silicates may be used alone or in combination, and the molar ratio of SiO 2 / Na 2 O can be adjusted by mixing.
  • sodium silicate used as a caking additive is such that the molar ratio of SiO 2 / Na 2 O 1 It is desirable that the range be 0.0 or more and less than 3.0, and it is more desirable that the range be 2.0 or more and less than 3.0. There is no commercial product of sodium silicate having a SiO 2 / Na 2 O molar ratio of less than 2.0, but such a product may be formed and used. Since it is easily available and has good fluidity and moldability, it should be 2.0 or more and less than 3.0, and in the above-mentioned classification of sodium silicate, silicic acid corresponding to No. 1 and No.
  • These sodium silicates No. 1 and No. 2 provide a coated sand having stable filling characteristics and good strength characteristics, even in a wide range of the concentration of the water glass aqueous solution.
  • the coated sand obtained by using sodium silicate having a SiO 2 / Na 2 O molar ratio of 2.0 or more and less than 3.0 as a binder has good fluidity and moldability. Because of its higher water absorption than other sodium silicates, such coated sands are preferably applied in applications where they are ready to use, for example in dry areas where the air is dry It is suitable for use in cold regions, and when stored, it is recommended that it be stored in a dry area.
  • the water glass aqueous solution used in the present invention means water glass in a state dissolved in water, and is used in the state of a stock solution as purchased in the market, and water is added to such a stock solution. Thus, it is used in a diluted state.
  • a solid content obtained by removing a volatile substance such as water or a solvent from such a water glass aqueous solution is called a non-volatile content, and this corresponds to the above-described soluble silicate compound such as sodium silicate.
  • concentration in water glass aqueous solution becomes so thick that the ratio of such a non volatile matter (solid content) is high.
  • the non-volatile content of the aqueous water glass solution used in the present invention corresponds to the ratio excluding the amount of water in the stock solution when it is composed of the stock solution, while the stock solution is water.
  • the ratio excluding the amount of water in the stock solution and the amount of water used for dilution corresponds to the nonvolatile content of the aqueous water glass solution used. Will be.
  • the non-volatile content in the water glass aqueous solution is set to an appropriate ratio depending on the type of the water glass and the like, but is preferably contained in a ratio of 20 to 45% by mass. It is desirable.
  • the water glass component corresponding to this non-volatile content is uniformly and uniformly applied to the refractory aggregate when mixed (kneaded) with the refractory aggregate.
  • a mold having high bending strength and high hardness when scratching the surface can be advantageously formed.
  • the heating temperature is increased or the heating time is increased for drying the coated sand. For this reason, problems such as energy loss are caused.
  • the proportion of non-volatile components in the water glass aqueous solution becomes too high, it becomes difficult to uniformly coat the surface of the refractory aggregate with the water glass component, resulting in an increased amount of lumps and mold characteristics. It is desirable to prepare a water glass aqueous solution so that the non-volatile content is 45% by mass or less, and therefore the water content is 55% by mass or more.
  • such a water glass aqueous solution is desirably used in a proportion of 0.1 to 2.5 parts by mass in terms of solid content when considered as only a non-volatile content with respect to 100 parts by mass of the refractory aggregate, Among these, a ratio of 0.2 to 2.0 parts by mass is particularly advantageously employed, and a water glass coating layer is formed on the surface of the refractory aggregate.
  • the solid content was measured on a heating plate that weighed and contained 10 g of a sample in an aluminum foil dish (length: 90 mm, width: 90 mm, height: 15 mm) and held at 180 ⁇ 1 ° C. After placing and leaving for 20 minutes, the sample pan was inverted and left on the heating plate for an additional 20 minutes.
  • Solid content (%) [weight after drying (g) / weight before drying (g)] ⁇ 100 If the amount of the water glass aqueous solution used is too small, it is difficult to form an effective coating layer of water glass on the surface of the refractory aggregate, and the coated sand is not sufficiently solidified or hardened. In addition, even if the amount of water glass aqueous solution used is too large, the water glass aqueous solution is excessively attached to the surface of the refractory aggregate, making it difficult to form a uniform coating layer, and the amount of lumps generated. This is because there is a risk of increasing the amount of metal, which in turn adversely affects the physical properties of the mold and makes it difficult to remove the sand from the core after casting the metal.
  • the coated sand in which a coating layer is formed on the surface of the refractory aggregate using the above-mentioned water glass aqueous solution is the object.
  • the layer can contain a predetermined additive as required.
  • a method of kneading or mixing the refractory aggregate with a refractory aggregate after blending a predetermined additive in a water glass aqueous solution in advance, or separately from the water glass aqueous solution A method of adding a predetermined additive to the refractory aggregate and kneading or mixing the whole uniformly is adopted.
  • solid oxides and salts are advantageously used as one of such additives.
  • the moisture resistance of the coated sand can be advantageously improved.
  • the solid oxide it is effective to use oxides of silicon, zinc, magnesium, aluminum, calcium, lead, and boron, for example.
  • silicon dioxide, zinc oxide, aluminum oxide, and boron oxide is desirable.
  • silicon dioxide precipitated silicic acid and exothermic silicic acid are preferably used.
  • the salt there are silicofluoride, silicate, phosphate, borate, tetraborate, carbonate, etc.
  • potassium acid zinc carbonate, potassium metaborate, sodium tetraborate, tetraborate
  • potassium acid tetraborate
  • These solid oxides and salts are used at a ratio of 100% by mass or less, preferably about 0.5 to 5% by mass with respect to the nonvolatile content in the water glass aqueous solution.
  • a coupling agent that strengthens the bond between the refractory aggregate and water glass (binder).
  • a coupling agent that strengthens the bond between the refractory aggregate and water glass (binder).
  • silane coupling agent, zircon coupling agent, titanium cup A ring agent or the like can be used.
  • a lubricant that contributes to improving the flowability of the coated sand.
  • waxes such as paraffin wax, synthetic polyethylene wax, montanic acid wax; stearic acid amide, oleic acid amide, erucic acid amide, etc.
  • Fatty acid amides such as methylene bis stearic acid amide and ethylene bis stearic acid amide; stearic acid, stearyl alcohol, stearic acid metal salt, lead stearate / zinc stearate, calcium stearate / magnesium stearate, stearin Acid monoglycerides, stearyl stearate, hydrogenated oils and the like can be used.
  • release agents paraffin, wax, light oil, machine oil, spindle oil, insulating oil, waste oil, vegetable oil, fatty acid ester, organic acid, fine graphite particles, mica, meteorite, fluorine release agent, silicone release agent An agent or the like can also be used.
  • Each of these other additives is generally contained in a proportion of 5% by mass or less, preferably 3% by mass or less, with respect to the nonvolatile content in the water glass aqueous solution.
  • a water glass aqueous solution as a caking additive is kneaded or mixed with an additive as necessary with respect to the heated refractory aggregate.
  • the method of obtaining sand is to be adopted, but the water vaporization of the water glass aqueous solution (coating layer) at that time needs to be performed quickly before the water glass solidifies or hardens.
  • the water glass aqueous solution is added (mixed) to the refractory aggregate within 5 minutes, more preferably within 3 minutes, and the water content is removed to dry state. It is desirable that the powder coated sand. If the transpiration time becomes long, the mixing (kneading) cycle becomes long and the productivity is lowered, and the water glass aqueous solution is in contact with CO 2 in the air for a long time and may cause problems such as deactivation. Because it becomes higher.
  • the refractory aggregate is preheated, A method of kneading or mixing a water glass aqueous solution to be mixed is employed.
  • the water glass aqueous solution is kneaded or mixed with the preheated refractory aggregate so that the water in the water glass aqueous solution is evaporated very quickly by the heat of the refractory aggregate. Therefore, the moisture content of the coated sand obtained can be effectively reduced, and a dry powder having room temperature fluidity can be advantageously obtained.
  • the preheating temperature of the refractory aggregate is appropriately selected according to the water content of the aqueous water glass solution and the blended amount thereof, but is generally about 100 to 150 ° C., more preferably It is desirable to heat the refractory aggregate to a temperature of about 100 to 120 ° C. If the preheating temperature is too low, it is not possible to effectively evaporate moisture, and it takes time to dry. Therefore, it is desirable to set the temperature to 100 ° C. or higher. If the temperature becomes too high, the hardening of the water glass proceeds when the coated sand obtained is cooled, and in addition, the formation of composite particles proceeds, which causes problems in the function as the coated sand, particularly physical properties such as strength. Because it becomes like this.
  • the coated sand according to the present invention is manufactured with a moisture content adjusted to 0.5% by mass or less, preferably 0.3% by mass or less, and for mold molding.
  • the filling ability of the mold into the mold cavity is further improved, and even in a mold formed using such coated sand, excellent characteristics are imparted. It is.
  • the coated sand is filled into a molding cavity of a mold that gives a target mold, and then steam is blown. By passing through the filled phase of the coated sand and holding it in the mold until it is dried, the filled coated sand is solidified or cured.
  • a mold such as a mold or a wooden mold to be filled with dry coated sand is preliminarily kept warm by heating, so that drying of the coated sand moistened with water vapor is advantageous. It can be made to progress.
  • the temperature for preheating is preferably about 60 to 140 ° C., preferably about 80 to 130 ° C., particularly about 100 to 120 ° C.
  • this heat retention temperature is high, it becomes difficult for steam to pass to the surface of the coated sand filling layer filled in the mold, and when the temperature is too low, it takes time to dry the molded mold. Become.
  • the coated sand filled in the mold should be kept in the mold for a certain period of time until the mold is taken out after the water vapor is passed, and until the mold is dried.
  • the holding is preferably performed in the mold for 30 seconds to 300 seconds, more preferably 30 seconds to 180 seconds. This is because the coated sand moistened with water vapor has good heat transfer by preheating the mold, so that the coated sand can be heated uniformly by holding in the mold and solidified or cured. I can do it.
  • the dry coated sand to be filled in such a mold is also preferably preheated.
  • the bending strength of the obtained mold can be increased more advantageously by filling the molding die with the coated sand heated to a temperature of 30 ° C. or higher.
  • the heating temperature of such coated sand is preferably about 30 to 100 ° C., and particularly, coated sand heated to a temperature of about 40 to 80 ° C. is advantageously used.
  • the mold is heated as described above. Specifically, after the dry coated sand is filled into the mold cavity, the mold is provided in the filling phase formed there. Through the vents, water vapor is passed under pressure to wet the coated sand that constitutes the filling phase, and they are bonded and joined together to form an integral mold-shaped coated sand aggregate (bonded product). It is formed.
  • Water glass is usually solidified by evaporation to dryness of water if no additives are added, and it is cured when oxides or salts are added as curing agents. It becomes. In the present invention, practically, since the curing agent is added, the filling phase is cured, but it may be simply solidified.
  • the steam may be saturated steam or superheated steam, but the superheated steam is in the form of wet steam containing water droplets.
  • the state of dry steam which does not contain a water droplet in superheated steam, it is not used for moistening a coated sand according to this invention, However, It can be used for drying.
  • the temperature of the water vapor that is blown through the vent of such a mold and allows the inside of the coated sand filling phase to pass through is generally about 80 to 150 ° C., more preferably about 95 to 120 ° C. .
  • a steam temperature around 100 ° C. is advantageously employed.
  • a gauge pressure value of about 0.01 to 0.3 MPa, more preferably about 0.01 to 0.1 MPa is advantageously employed.
  • the pressure for venting water vapor is about the above-mentioned gauge pressure
  • the water vapor can be evenly vented to the mold formed in the mold
  • the water vapor passage time and the mold drying time are short, and the molding speed can be reduced.
  • such a gauge pressure has an advantage that molding is possible even when the breathability of the coated sand is poor. If the gauge pressure is too high, a squeezing occurs near the vent, and if it is too low, the whole may not be ventilated and the coated sand may not be sufficiently moistened.
  • a method for venting water vapor as described above a method is adopted in which water vapor is blown from a vent provided in the mold, and the coated sand (phase) filled in the molding cavity of the mold is vented.
  • the ventilation time water vapor is supplied to the surface of the filled coated sand so that the water glass as the binding material on the surface is sufficiently moistened and the coated sand can be bonded (bonded) to each other.
  • the time is appropriately selected depending on the size of the molding die, the number of vents, and the like. Generally, a ventilation time of about 2 seconds to about 60 seconds is adopted. If the water vapor passage time is too short, it will be difficult to sufficiently wet the coated sand surface.
  • the binder on the coated sand surface may dissolve and flow out. This is because of the above.
  • the improvement in water vapor permeability in the coated sand filled in the mold can be further enhanced by performing water vapor ventilation while sucking the atmosphere in the mold from the exhaust port of the mold. Is possible.
  • the method is not particularly limited as long as the coated sand can be moistened in addition to aeration of water vapor, but since the molding time and the molding process are simple, the above water vapor is used. A venting technique is advantageously employed.
  • the coated sand is rapidly dried to the inside of the filled phase, and the solidification or curing of the filled phase is further advantageously promoted.
  • the curing rate can be advantageously increased, and the properties such as the bending strength of the obtained mold can be advantageously enhanced, and it can also contribute to shortening the molding time of the mold.
  • the air such as dry air is ventilated at the same time as the aeration with water vapor so that the aeration is continued even after the aeration of water vapor.
  • At least one gas of carbon dioxide (CO 2 gas), ester, and carbonate may be passed between the water vapor and the dry air.
  • the solidification can be further promoted by neutralizing the binder with the carbon dioxide, ester, or carbonate gas.
  • the carbon dioxide, ester, or carbonate gas may be ventilated at the same time as the water vapor, or after the water vapor, or at the same time as the dry air. There is no problem even if it is attached.
  • the inside of the cavity of the mold may be depressurized before venting of water vapor, and the inside of the cavity may be set to a pressure lower than the atmospheric pressure. Therefore, an apparatus for sucking air in the cavity may be provided in the mold manufacturing apparatus.
  • the mold formed as described above can be heated by microwaves.
  • microwaves there exists an advantage which can evaporate only a water
  • binder binder
  • the method of heating the molded mold with microwaves can be considered as an effective means for the preservation of the mold and the improvement of the casting quality.
  • various known forming methods can be appropriately employed in addition to the method of filling the forming die with the coated sand and forming the mold.
  • an additive manufacturing method as disclosed in Japanese Patent Application Laid-Open No. 7-507508, Japanese Patent Application Laid-Open No. 9-141386, and the like, specifically, a layer of coated sand is sequentially laminated. It is also possible to employ a method in which a portion corresponding to the mold to be cured is cured and a three-dimensional mold is directly formed.
  • mm -Measurement of scratch hardness (mm)- About the test piece of width: 25.4mmxthickness: 25.4mmxlength: 200mm obtained using each CS, the scratch hardness is measured using a scratch hardness meter (GF type). .
  • GF type scratch hardness meter
  • the tip of the scratch hardness tester is pressed against the surface of the test piece, and the upper black lever is rotated once in a clockwise direction and once in a counterclockwise direction, and the rotation is repeated five times.
  • the depth of the tooth penetration is read from the scale on the side (mm).
  • the scratch hardness is stronger (higher) as the value is smaller, and weaker (lower) as it is larger.
  • Example 1 of CS (Example 1)- Lunamos # 50 (trade name: manufactured by Kao Corporation), a commercially available artificial sand for casting, is prepared as a fireproof aggregate, and commercially available sodium silicate No. 1 (trade name: Fuji Chemical Co., Ltd.) is used as a binder.
  • a water glass aqueous solution having a non-volatile content (a ratio obtained by removing the amount of water from the water glass aqueous solution) of 46.1% was prepared by diluting with a company.
  • Example 2-9 (Examples 2-9)- As a binder, commercially available sodium silicate No. 1 (trade name: manufactured by Fuji Chemical Co., Ltd.) was diluted with water, and the non-volatile content was 44.0%, 41.6%, 39.7%, 37. CS2 to 9 were obtained according to the same procedure as in Production Example 1, except that a water glass aqueous solution having 5%, 33.5%, 30.0%, 25.0%, or 20.0% was prepared. .
  • a water glass aqueous solution having 5%, 33.5%, 30.0%, 25.0%, or 20.0% was prepared. .
  • Examples 10-15 As a binder, commercially available sodium silicate No. 2 (trade name: manufactured by Fuji Chemical Co., Ltd.) was diluted with water, and the nonvolatile content was 46.3%, 44.1%, 41.3%, 38.38, respectively.
  • CS10 to 15 were obtained according to the same procedure as in Production Example 1 except that a 3%, 26.9%, or 20.0% water glass aqueous solution was prepared.
  • CS16 to 18 were obtained according to the same procedure as in Production Example 1, except that an aqueous glass solution was prepared.
  • Example 22 The same as Production Example 1 except that commercially available alumina-based spherical aggregate ESPAL # 60 (trade name: manufactured by Yamakawa Sangyo Co., Ltd.) was used as the refractory aggregate, and the non-volatile content was 33.5%. According to the procedure, CS22 was obtained.
  • Example 23 Use solid Mikawa sand 7 (trade name: manufactured by Mikawa Silica Co., Ltd.) as fireproof aggregate, solid content when water glass is considered as non-volatile content only for 100 parts of Mikawa Sand 7 CS23 was obtained according to the same procedure as in Production Example 1, except that it was added at a rate of 1.0 part in terms of conversion, and the non-volatile content was 33.5%.
  • -CS Production Example 24 (Comparative Example 1)- As a caking additive, commercially available sodium silicate No. 1 (trade name: manufactured by Fuji Chemical Co., Ltd.) was diluted with water, and the non-volatile content (ratio obtained by removing the water content from the water glass aqueous solution) was 15.0%.
  • CS24 was obtained according to the same procedure as in Production Example 1 except that a water glass aqueous solution was prepared.
  • -CS Production Example 25 (Comparative Example 2)- As a caking additive, commercially available sodium silicate No. 2 (trade name: manufactured by Fuji Chemical Co., Ltd.) was diluted with water, and the non-volatile content (the ratio of water content removed from the water glass aqueous solution) was 13.3%.
  • CS25 was obtained according to the same procedure as in Production Example 1 except that a water glass aqueous solution was prepared.
  • CS26 Comparative Example 3
  • commercially available sodium silicate No. 3 (trade name: manufactured by Fuji Chemical Co., Ltd.) was diluted with water to make the non-volatile content (ratio of water content from the water glass aqueous solution) 9.6%.
  • CS26 was obtained according to the same procedure as in Production Example 1 except that an aqueous water glass solution was prepared.
  • -CS Production Example 27 (Comparative Example 4)- As a caking additive, commercially available sodium silicate No. 5 (trade name: manufactured by Fuji Chemical Co., Ltd.) was diluted with water, and the non-volatile content (ratio obtained by removing the water content from the water glass aqueous solution) was set to 15.0%. CS27 was obtained according to the same procedure as in Production Example 1 except that a caking additive was prepared.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

La présente invention a pour but de fournir un sable enrobé à l'état sec ayant une fluidité supérieure à température normale, un procédé avantageux pour la fabrication de celui-ci, et un procédé pour la fabrication d'un moule ayant des caractéristiques supérieures utilisant ce sable enrobé. Le sable enrobé à l'état sec ayant une fluidité à température normale est formé par mélange d'un agrégat réfractaire qui a été chauffé avec une solution aqueuse de verre soluble comme additif de concrétion et évaporation de l'eau pour former une couche de revêtement de l'additif de concrétion sur la surface de l'agrégat réfractaire. Le pourcentage d'humidité de celui-ci est ajusté à 0,5% en masse ou moins. Après avoir rempli de sable enrobé à l'état sec une cavité de moulage d'une matrice de formage, on effectue la solidification ou le durcissement de ce sable enrobé par ventilation avec de la vapeur d'eau et on obtient un moule ciblé.
PCT/JP2013/083903 2012-12-19 2013-12-18 Sable enrobé, procédé de fabrication de celui-ci et procédé de fabrication d'un moule WO2014098129A1 (fr)

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JP2014553179A JP6193884B2 (ja) 2012-12-19 2013-12-18 コーテッドサンド及びその製造方法並びに鋳型の製造方法
EP13864998.3A EP2937160A4 (fr) 2012-12-19 2013-12-18 Sable enrobé, procédé de fabrication de celui-ci et procédé de fabrication d'un moule
CN201380067209.3A CN104903023B (zh) 2012-12-19 2013-12-18 覆膜砂及其制造方法以及铸型的制造方法
US14/706,296 US20150231691A1 (en) 2012-12-19 2015-05-07 Coated sand, manufacturing method for same, and manufacturing method for mold

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CN115069968A (zh) * 2021-03-10 2022-09-20 西南科技大学 铸造湿型砂、环保型碳质添加剂及其制备工艺
WO2024079946A1 (fr) * 2022-10-11 2024-04-18 新東工業株式会社 Procédé de formage de coulée et matériau coulé
JP7537964B2 (ja) 2020-01-07 2024-08-21 花王株式会社 鋳型造型用組成物

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DE102017111515A1 (de) 2017-05-26 2018-11-29 Gebrüder Dorfner GmbH & Co. Kaolin- und Kristallquarzsand-Werke KG Composit-Partikel mit hydrophilen und hydrophoben Oberflächenbeschichtungen
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JP2021074725A (ja) * 2019-11-06 2021-05-20 トヨタ自動車株式会社 鋳型用接着剤の製造方法、鋳型の製造方法、及び鋳型
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WO2016143051A1 (fr) * 2015-03-09 2016-09-15 技術研究組合次世代３Ｄ積層造形技術総合開発機構 Matériau granulaire, dispositif de fabrication de moule de moulage de stratifié tridimensionnel et procédé de fabrication de moule de moulage de stratifié tridimensionnel
JP6027264B1 (ja) * 2015-03-09 2016-11-16 技術研究組合次世代３Ｄ積層造形技術総合開発機構 粒状材料、３次元積層造形鋳型の製造装置および３次元積層造形鋳型の製造方法
JP2020006412A (ja) * 2018-07-09 2020-01-16 花王株式会社 耐火性骨材
WO2020012934A1 (fr) 2018-07-09 2020-01-16 花王株式会社 Sable à enduit inorganique
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CN113646107B (zh) * 2019-03-29 2024-05-03 旭有机材株式会社 铸型材料组合物及使用其的铸型的制造方法
JP7537964B2 (ja) 2020-01-07 2024-08-21 花王株式会社 鋳型造型用組成物
CN115069968A (zh) * 2021-03-10 2022-09-20 西南科技大学 铸造湿型砂、环保型碳质添加剂及其制备工艺
CN115069968B (zh) * 2021-03-10 2023-05-23 西南科技大学 铸造湿型砂、环保型碳质添加剂及其制备工艺
WO2024079946A1 (fr) * 2022-10-11 2024-04-18 新東工業株式会社 Procédé de formage de coulée et matériau coulé

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