Abstract:
A sublimation pattern casting method capable of achieving the optimum discharge of generated gas, comprising the step of performing a casting while discharging the gas generated by the sublimation of the pattern to the outside of a mold through a discharge passage having a discharge gas suppressing means when a product is cast by filling molten metal into the mold formed by burying a synthetic resin foam body pattern in foundry sand to sublimate the pattern by the molten metal, wherein the permeability of the discharge passage is controlled based on the material and shape of the pattern and the type and temperature of the molten metal.
Abstract:
A binder composition for self-curing mold formation, comprising at least one condensate (A) selected from furfuryl alcohol condensate and furfuryl alcohol/formaldehyde condensate, and an acid-curable resin (B), wherein about the condensate (s) (A), the presence ratio by mole of its/their furan rings (a) to the total of its/their methylol groups (b), methylene groups (c) and oxymethylene groups (d), a : (b + c + d), is from 1 : 1.00 to 1 : 1.08, and the content by percentage of the at least one condensate (A) is from 0.3 to 8.0% by weight.
Abstract:
To improve a hardening speed and strength of a mold to thereby enhance productivity with the result that work environment, profitability and quality of casting are improved concurrently. A specified caking additive composition for forming a mold contains 6.0 to 25.0 weight percents of metallic salts of organic sulfonic acid, a specified hardener composition for forming a mold contains 0.5 to 20.0 weight percents of metallic salts of organic sulfonic acid, and a sand composition for forming a mold contains the caking additive composition for forming a mold and/or the hardener composition for forming a mold.
Abstract:
Disclosed is a spherical molding sand having an average particle diameter of 0.03-1.5 mm which is produced by a flame fusion method. The spherical molding sand is used together with an urethane binder.
Abstract:
A binder composition for use in producing molds, which contains a binder obtained by the polycondensation of monomers mainly comprising furfuryl alcohol, urea and an aldehyde and wherein a difference (A-B) between the weight percentage (A) of the feed furfuryl alcohol and the weight percentage (B) of the unreacted furfuryl alcohol, both based on the binder, ranges from 5.0 to 60.0. The composition serves to accelerate the hardening of the binder without worsening the working environment.
Abstract:
An acid-curable, refractory particulate material composition for forming a mold which can improve the mold strength. The composition comprises a refractory particulate material, a binder composition containing an acid-curable resin, an acid-containing curing agent composition, and at least one solvent selected from among the alcohols (1): R 1 -OH, ether alcohols (2), and esters (3). In said formulas R 1 represents a straight-chain or branched aliphatic haydrocarbon group having 3 to 12 carbon atoms or a benzyl group: R 2 represents a straight-chain or branched aliphatic hydrocarbon group having 1 to 10 carbon atoms or a phenyl or benzyl group: R 3 represents an ethylene or trimethylene group; n is an integer of 1 to 12; R 4 represents a phenyl or methyl group; and R 5 represents an aliphatic hydrocarbon group having 2 to 6 carbon atoms or -(R 3 -O)n -R 2 .
Abstract:
The present invention provides a refractory granular material composition for a self-hardening molding by acid-hardening, consisting essentially of: a refractory granular material, an acid-hardening resin-containing binder composition, an acid-containing hardener composition, and at least one solvent selected from the group consisting of (1) alcohols, (2) ether alcohols and ester shown below:wherein R1 represents a C4 to C8 straight-chain or branched aliphatic hydrocarbon group or a benzyl group; R2 represents a C1 to C10 straight-chain or branched aliphatic hydrocarbon group, phenyl group or a benzyl group; R3 represents an ethylene group or a propylene group; n is an integer of 1 to 12; R4 represents, phenyl group or a methyl group; and R5 is a C2 to C6 aliphatic hydrocarbon group or (R3 -O)n R2.
Abstract:
A BINDER COMPOSITION FOR SELF-CURING MOLD FORMATION, COMPRISING AT LEAST ONE CONDENSATE (A) SELECTED FROM FURFURYL ALCOHOL CONDENSATE AND FURFURYL ALCOHOL/FORMALDEHYDE CONDENSATE, AND AN ACID-CURABLE RESIN (B), WHEREIN ABOUT THE CONDENSATE (S).(A), THE PRESENCE RATIO BY MOLE OF ITS/THEIR FURAN RINGS (A) TO THE TOTAL OF ITS/THEIR METHYL GROUPS (B), METHYLENE GROUPS (C) AND OX METHYLENE GROUPS (D), A : (B + C + D), IS FROM 1 :1.00 TO 1 : 1.08, AND THE CONTENT BY PERCENTAGE OF THE AT LEAST ONE CONDENSATE (A) IS FROM 0.3 TO 8.0% BY WEIGHT.
Abstract:
CERAMIC PARTICLES A ceramics particle produced by a flame fusion method, wherein the ceramics particle contains MgO and SiO2 as main components, and has a MgO/SiO2 weight ratio of from 0.1 to 10, and an average particle size of from 0.001 to 1.5 mm; a spherical molding sand produced by a flame fusion method, wherein the spherical molding sand contains MgO and SiO2 as main components, and has a MgO/SiO2 weight ratio of from 0.1 to 10, and an average particle size of from 0.001 to 1.5 mm; a spherical molding sand, wherein the spherical molding sand comprises MgO and SiO2 as main components, and has a MgO/SiO2 weight ratio of from 0.1 to 10, an average particle size of from 0.001 to 1.5 mm, and a spherical degree of 0.95 or more; a process for producing the above spherical molding sand; a casting mold containing the spherical molding sand as defined above; and a casting produced by casting with the mold as defined above. (Figure 1)