Forming device for thixoextrusion and method thereof

A thixoextrusion molding apparatus, comprising:

• a container having a first through-hole storing 10 to 30 parts weight of a semi-solid billet therein and a heater installed outside the first through-hole to maintain the temperature of the semi-billet constant;
• a stem insertable into the first through-hole from the front of the container to pressurize the semi-solid billet in the backward direction;
• a die ring coupled to the back of the container and having a plurality of coolant inflow/outflow holes to prevent thermal deformation in the circumferential direction;
• a die body disposed inside the die ring and having a second through-hole, which is in communication with the first through-hole of the container and has a smaller diameter than the first through-hole of the container, through which the semi-solid billet is extruded and a plurality of thermocouple insertion holes for measuring the temperature of the semi-solid billet;
• a die body support coupled to the back of the die body inside the die ring and having a plurality of coolant inflow/outflow holes so as to change the phase of the extruded semi-solid billet to a solid extrudate;
• a die balance support held in close contact with the die body support and coupled to the back of the die ring;
• and
• a cooling unit coupled to the die balance support to cool the solid extrudate.