Pressure Behavior in Mold Cavity during Titanium Casting : Differential Pressure Casting Unit with Two Chambers

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  • OKAWA Seigo
    Division of Dental Biomaterial Science, Department of Oral Health Science, Course for Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences
  • KANATANI Mitsugu
    Division of Dental Biomaterial Science, Department of Oral Health Science, Course for Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences
  • WATANABE Kouichi
    Division of Dental Biomaterial Science, Department of Oral Health Science, Course for Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences
  • NAKANO Syuji
    Division of Dental Biomaterial Science, Department of Oral Health Science, Course for Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences
  • MIYAKAWA Osamu
    Division of Dental Biomaterial Science, Department of Oral Health Science, Course for Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences

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Other Title
  • チタン鋳造時の鋳型空洞の圧力挙動 : 二室加圧型鋳造機の場合
  • チタン鋳造時の鋳型空洞の圧力挙動 : 二室加圧鋳造機の場合

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Description

Since the mold cavity is exposed to the melting chamber in a two-chamber casting unit, the cavity is filled with Ar gas till casting of molten titanium. Thus, the gas evacuation rate immediately after melt casting must influence the castability and generation of internal defects. In this study, the cavity pressure was measured using a mold simulating a two-chamber casting process at room temperature and the results were converted into the casting pressure. Mold permeability and preset pressures in the melting and casting chambers were considered as factors influencing the quality of casting. The higher the mold permeability and the higher the difference between the preset pressures, the higher level the casting pressure rapidly reached. The results suggested that the choice of investment material should be made from the perspective of mold permeability suitable to the casting mechanism.

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