Cast iron mold for plastic molding

Details Cast iron mold for plastic molding Cast iron mold for plastic molding

1984-06-06

1986-02-25

Bashore, S. Leon

Metal treatment

Compositions

Heat treating

75123CB, 148139, 249135, 164 581, C21D 500, C22C 3704

Patent

active

045727511

ABSTRACT:
A cast mold for plastic molding, made of a nodular graphite cast iron comprising spheroidal graphite particles. The mold includes a peripheral portion defining a molding surface which contacts a plastic material to be molded. At least the peripheral portion of the mold has a particle size distribution of spheroidal graphite in which not less than 90% of the graphite particles are not greater than 10 microns, and not less than 50% of the graphite particles are not greater than 6 microns. Preferably, the nodular graphite cast iron consists by weight of 2.5-3.8% of carbon, 2.0-3.0% of silicon, not more than 0.8% of manganese, 2.0-5.0% of nickel, 0.2-1.0% of molybdenum, and the balance being iron, spheroidizer and impurities.

REFERENCES:
patent: 3702269 (1972-11-01), Church
patent: 4153477 (1979-05-01), Beyer et al.
patent: 4236944 (1980-12-01), Yaman et al.
patent: 4435226 (1984-03-01), Neuhauser et al.
patent: 4484953 (1984-11-01), Kovacs et al.
Dubois et al., "Plastics Mold Engineering Handbook," Van Nostrand Reinhold Co., 1978, pp. 149-150.

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