Casting device

Abstract

A casting device includes: dies formed with a cavity including an opening at a lower portion; a pressurizing chamber disposed below the dies and containing molten metal and further formed with a sealed space above the molten metal; a cylindrically-shaped stalk having an upper end opening communicating with the opening of the cavity and a lower end opening immersed into the molten metal contained inside the pressurizing chamber; a pressurizing means configured to supply a gas to the sealed space of the pressurizing chamber to pressurize the inside of the pressurizing chamber; a depressurizing means configured to discharge a gas from the cavity to depressurize the inside of the cavity; and a control device. The control device, when the molten metal is provided to the cavity from the pressurizing chamber, pressurizes the inside of the pressurizing chamber by the pressurizing means until the molten metal reaches the opening of the cavity and depressurizes the inside of the cavity by the depressurizing means while continuing pressurizing the inside of the pressurizing chamber after the molten metal reaches the opening of the cavity.

What is claimed is: 
     
         1 . A casting device, comprising:
 a die formed with a cavity including an opening at a lower portion;   a pressurizing chamber disposed below the die, containing molten metal, and further formed with a sealed space above the molten metal;   a stalk formed in a cylindrical shape, and having an upper end opening communicating with the opening of the cavity and a lower end opening immersed into the molten metal contained inside the pressurizing chamber;   a pressurizing means configured to supply a gas to the sealed space of the pressurizing chamber to pressurize the inside of the pressurizing chamber;   a depressurizing means configured to discharge a gas from the cavity to depressurize the inside of the cavity; and   a control device, when the molten metal is provided to the cavity from the pressurizing chamber, configured to pressurize the inside of the pressurizing chamber by the pressurizing means until the molten metal reaches the opening of the cavity and configured to depressurize the inside of the cavity by the depressurizing means while continuing pressurizing the inside of the pressurizing chamber after the molten metal reaches the opening of the cavity.   
     
     
         2 . The casting device according to  claim 1 , further comprising a gate seal pin formed movable back and forth relative to the opening, and configured to open and close the opening,
 wherein the control device closes the opening by the gate seal pin after the molten metal is filled in the cavity.   
     
     
         3 . The casting device according to  claim 1 , further comprising a pressurizing pin formed movable back and forth relative to a molten metal basin communicating with the cavity, and configured to pressurize the molten metal filled inside the cavity. 
     
     
         4 . The casting device according to  claim 2 , further comprising a pressurizing pin formed movable back and forth relative to a molten metal basin communicating with the cavity, and configured to pressurize the molten metal filled inside the cavity.