Fukui Prefectural Government

Koichi Tomita

Makoto Nojiri

Provided is a high-pressure casting method and a high-pressure casting device which are capable of safe and high-quality casting of a high-fusion-point metal having a fusion point exceeding 1000 K. After melting a casting material () inside a melting container () of cartridge type, the melting container () is linearly moved to pass through a guide () attached to a casting port bush () to thereby be communicated with the casting port bush (). The melting container () is brought into close contact with the guide () and is setting to a cooling state. After the elapse of prescribed time, a plunger () is brought into contact with a plunger tip (), and is immediately transferred together with a molten metal to the casting port bush (). The molten metal is pressurized inside the casting port bush (), and is injection-filled into a cavity ().

High-pressure casting method and high-pressure casting device

Provided is a dissimilar metal joint product of nickel-titanium alloy material and pure titanium material, having a tensile strength at the joint not less than that of the pure titanium material before joining, having a small variation in the strength at the joint, and having narrow heat-affected zone after joining, and a method for joining thereof. A round rodof the nickel-titanium alloy material is integrally joined with a round rodof the pure titanium material, while rotating at least one of the joining faces for conducting frictional pressure welding, applying a specified upset force thereto to compress thereof, after the start of deceleration of the rotation, in a period where peripheral velocity in the outermost periphery of the rotation in the joining face is not less than 0.5 m/sec. A reaction layer structure is formed at the joint by the compressive force induced by the upset force and by the rotational force of decelerating rotation.

Growing community of inventors

Fukui, Japan

Koichi Tomita