Process for preparing molding sand for green sand mold

Details Process for preparing molding sand for green sand mold Process for preparing molding sand for green sand mold

1998-10-08

2000-01-25

Green, Anthony

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 3827, 106 383, 106482, 106485, 106486, 164349, B28B 734, B22C 118, B22C 902

Patent

active

060173874

ABSTRACT:
A process for preparing a molding sand for a green sand mold is provided. The process comprises the step of drying under a reduced pressure of 0 to 0.3 atm for 0.5 to 30 seconds a green molding sand obtained by kneading silica sand, clay, and water, to dry the clay superficial part and to retain in a moist state the clay deeper part on the silica sand core part in each particle of the molding sand. The molding sand prepared by this process has enhanced flowability. Furthermore, the sand mold prepared from the molding sand has sufficient strength.

REFERENCES:
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patent: 4529028 (1985-07-01), Dybala et al.
patent: 4620586 (1986-11-01), Musschoot
patent: 5587008 (1996-12-01), LaFay et al.
Radhakrishnan et al., Effect of Water-Clay Ratio and Bentonite Content on the Flowability of Synthetic Sands, BR Foundryman, Aug. 1975, vol. 68, No. Part 8, Aug. 1975, pp. 202-208, XP-002091487.
Subba Rao V V et al., Effect of Clay-Water Ratio and Clay Content on the Physical Properties of Bentonite Bonded Homogeneous Sand Mixtures, BR Foundryman, Mar. 1976, vol. 69, No. Part 3, Mar. 1976, pp. 71-77, XP-002091488.
Hofmann et al., Statistical Evaluation of 200 Different Foundry Sands, American Foundryman's Society Transactions, vol. 80, No. 8, 1980, pp. 177-186, XP-002091489. [No Date].
Effect of Water in Green Sand Mixtures, Modern Casting, vol. 72, No. 7, Jul. 1982, p. 44, XP-002091490.
Blatz, J., Cooling of Moulding Sand Under Vacuum, Foundry Trade Journal, vol. 166, No. 3447, Feb. 7, 1992, p. 64, XP-000249509.

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