METHOD AND APPARATUS FOR EXTRUSION-FORMING METALLIC LONG SIZE MATERIAL

PURPOSE:To continuously form a wire rod having the necessary length from molten metal without forming a billet, etc., by continuously extrusion-forming a metallic long size material from a metallic base material in the molten state. CONSTITUTION:The molten metal 2 is spouted to a tapered tube 6 from a spouting tube 5 by an electromagnetic pump 3. The tapered tube 6 is kept at the temp. slightly lower than the m.p. of the molten metal 2 and the heat of the molten metal 2 is slowly radiated in the inner part of the tapered tube 6, and while becoming half-solidified state gradually from the outer side, the metallic base material is extruded and drawn to and in the tip end side of the tapered tube 6 having more slender inner diameter by pressurizing force applied by the electromagnetic pump and gradually made slender. Further, the molten metal 2 in the half-solidified state is further cooled, solidified and extruded in a nozzle tube 7 kept at the temp. lower than that of the tapered tube 6.