Spherical casting sand

Details Spherical casting sand Spherical casting sand

2011-08-02

2011-08-02

Kerns, Kevin P (Department: 1735)

Metal founding

Process

Shaping a forming surface

C164S525000, C164S349000

Reexamination Certificate

active

07987892

ABSTRACT:
A spherical casting sand having an average particle diameter of 0.03 to 1.5 mm, produced by a flame fusion method, usable together with a urethane binder. Casting sands capable of producing a mold having higher strength and excellent surface smoothness without deformation or breakage with fewer gas defects in producing a mold by using a urethane binder in the cold box process or in the urethane self-hardening mold making method. The casting sand has longer bench life in the cold box process. Amount of generated gas that is a problem of the mold making method using a urethane binder can be significantly reduced, and a casting with fewer gas defects can be obtained.

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“Chemical binders—back to basics,” Foundery Trade Journal, vol. 167, No. 3476, Jun. 4, 1993, XP-000361344, pp. 311-312, 314-316, 318-319.
Burditt et al., “Mold & Core Binders Keep Pace with Industry Demands,” Modern Casting, vol. 78, Jun. 1988, No. 6, pp. 20-24, XP-000020514.

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