PURPOSE: To obtain a casting having only a little blow hole and flow mark by suitably controlling suction for venting and introduction and venting of inert gas in a melting chamber and a casting chamber at the time of casting a material for casting in the melting chamber into a mold in the casting chamber, reducing gas flow from the melting chamber to the casting chamber as far as possible and pouring.
CONSTITUTION: An apparatus body 10 is divided into upper and lower parts by a partition wall 11, and the upper part is the melting chamber 1 and the lower part is the casting chamber 2. In the melting chamber 1, an arc electrode 13 is hung and molten metal (m) is charged into a crucible 3 supported by supporting blocks 31 and melted by arc discharge under using the arc electrode as minus electrode. By varying magnetic flux of electromagnet 131 at side wall, Lorentz's force acts to the discharging arc and the material (m) for casting and the arc is moved to execute uniform melting. The mold 4 is successively connected below a funnel-shaped bush 14 having wide opening arranged at a passage 12. The gas is sucked to introduce by a vacuum pump 5 and an argon gas cylinder 6 and at the time of pouring the material (m) into the mold 4 from the crucible, the inner pressures in both chambers are made to almost the same pressure, and gas flow is stopped and at the same time of completing the pouring the suitable inner pressure difference between both chambers is made.
OGINO HIROYA
TOMAI TOORU
| JPS565622A | 1981-01-21 | |||
| JPS596739A | 1984-01-13 | |||
| JPS56126063A | 1981-10-02 |
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