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US 4,727,922 AGranted
Mold for high-temperature molten metal and method of producing high-melting metal article
OwnerAkio Nakanoinventor
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OwnerAkio Nakanoinventor
Estimating the term…
A mold and method for producing, or casting a high-melting metal article from a high-melting metal having a melting point of about 900.degree. to 1600.degree. C. includes a pair of male and female molds provided with a core part or liner part, one or both of the male and female molds formed of a ceramic, gases generated within a cavity in the solidification process of the molten metal are sucked out through the vent formed by incorporating a heat resistant, porous, gas-permeable material in which inserted detachably into the vent port of the gas vent passed through outward from the predetermined part of the cavity surfaces on the both molds of the core part and the liner part is drawn outward by a minute amount at a predetermined timing from the start of the pressurization of the interior of the mold cavity so that internal gases generated at a predetermined part of the interior of the mold cavity (at a thicker part where solidification occurs later than at other parts) are effectively discharged into the well in the auxiliary vent by the time the molten metal at the predetermined part is solidified, whereby even an article having a thicker part is molded without leaving gases in the thicker part.
A mold for a high-temperature molten metal, comprising:
A mold for a high-temperature molten material, comprising a pair of male and female molds provided with a core part or liner part, one or both of said male and female molds form of a ceramic, a vent provided by incorporated a heat-resistant, porous, gas-permeable material into said core part or liner part, an auxiliary vent leading from a predetermined part of mold cavity surfaces of said male and female molds to the exterior of said mold, a well provided in said auxiliary vent in the vicinity of said mold cavity surfaces, and a vent plug provided at the outlet of said auxiliary vent so as to be capable of being freely inserted and drawn out, said vent plug formed of a heat-resistant material, wherein said ceramic is a hot-pressed .alpha.-sialon ceramic or normal pressure sintered .alpha.-sialon ceramic which is a solid solution having the .alpha.-Si.sub.3 N.sub.4 structure and comprising a dense composite structure phase in a compositional region which can be called "partially stabilized" .alpha.-sialon region, namely, a region in which 60% by volume of granular crystals of .alpha.-sialon represented by the formula M.times.(Si, Al).sub.12 (O, N).sub.16, wherein M is Mg, Ca, Y or the like, coexists with 40% by volume of columnar crystals of .beta.-Si.sub.3 N.sub.4.
A method of producing a high-melting metal article comprising the steps of pouring a molten metal into a mold cavity of a pair of male and female molds, pressurizing the interior of said mold cavity, removing gases or the like generated in the solidification process of said molten metal in said mold cavity by sucking out said gases or the like through a vent provided by incorporating a heat-resistant, porous, gas-permeable material into a part of said molds, and drawing outward, at a predetermined timing from the start of said pressurization and by a minute amount, a vent plug provided so as to be capable of being freely inserted and drawn out, thereby discharging internal gases generated at a predetermined part of the interior of said mold cavity to the exterior of said mold cavity.
Dependencies are inferred from the claim text.