초록 ▼

High strength to weight ratio, improved dimensional and surface quality hollow metal moldings are formed by injecting thixotropic, semi-solid metal billets as a "short shot" into a mold cavity; introducing an inert gas into the charge under pressure to force the metal into full and faithful contact

High strength to weight ratio, improved dimensional and surface quality hollow metal moldings are formed by injecting thixotropic, semi-solid metal billets as a "short shot" into a mold cavity; introducing an inert gas into the charge under pressure to force the metal into full and faithful contact with cavity surfaces and to form a hollow portion in the molding; maintaining the pressure of the gas on the charge in the cavity until the metal has solidified and then venting the gas for molded product removal.

대표청구항 ▼

[ We claim:] [1.] A method of making a molded hollow part from a metal alloy comprising:injecting a charge of thixotropic, semi-solid metal into a mold cavity having product defining surfaces and formed by complementary mold members, the volume of said charge being less than the volume of said cavit

[ We claim:] [1.] A method of making a molded hollow part from a metal alloy comprising:injecting a charge of thixotropic, semi-solid metal into a mold cavity having product defining surfaces and formed by complementary mold members, the volume of said charge being less than the volume of said cavity;confining said charge in said cavity and injecting a gas that is chemically inert with respect to said metal into said charge so as to force said metal against the cavity surfaces and to create a hollow region within said metal charge;cooling the semi-solid metal charge to solidify it while maintaining the pressure of said gas on the charge;venting the gas from the mold cavity after solidification of the metal; andremoving the solidified molding from the cavity and mold.