PRECISION CASTING METHOD

PURPOSE:To allow stable precision casting by forming a casting pressure between a pressure melting chamber and vacuum casting chamber and casting a metallic material under this casting pressure. CONSTITUTION:Titanium is made into a circular cylindrical ingot and is subjected to arc melting on a copp...

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Bibliographic Details
Main Author OKUDA REIICHI
Format Patent
LanguageEnglish
Published 28.02.1990
Subjects
APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
CASTING
CASTING OF METALS
CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
DENTISTRY
HUMAN NECESSITIES
HYGIENE
MEDICAL OR VETERINARY SCIENCE
PERFORMING OPERATIONS
POWDER METALLURGY
TRANSPORTING
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Summary:PURPOSE:To allow stable precision casting by forming a casting pressure between a pressure melting chamber and vacuum casting chamber and casting a metallic material under this casting pressure. CONSTITUTION:Titanium is made into a circular cylindrical ingot and is subjected to arc melting on a copper crucible 7. The pressure change in the pressure melting chamber 2 and the vacuum casting chamber 3 of this time is such that the pressure in the pressure melting chamber 2 is increased by the inflow of gaseous argon simultaneously with an arc start, as the insides of both the chambers are evacuated to a vacuum by a vacuum pump 20. The pressure in the pressure melting chamber 2 increases rapidly and the pressure in the vacuum casting chamber 3 gradually attains about >=3kg/cm when a pouring switch is pushed. A leak valve operates at this time and the pressure is maintained. The pressure difference at the point of the time when a molten metal is poured from a crucible, i.e., the casting pressure attains about >=5kg/cm . The complete crown casting body which is cast to the pointed part at the tip is obtd. in this way without having blowholes.
Bibliography:Application Number: JP19880209378