EXTRUSION DIE ENABLE TO MINIMIZE THICKNESS DEVIATION AND WELDING LINES

摘要

PURPOSE: An extrusion die capable of minimizing thickness variation and weld lines is provided to secure a space enough to integrate extruded billets passed through a mandrel by extending the distance between the leading end and the forming hole of the mandrel. CONSTITUTION: An extrusion die comprises a bridge(100), a die housing(300), and an extrusion forming member(200). The bridge comprises a hollow forming core(110) with a core(111) for forming the inner section of a drum pipe(P) and two or more mandrels(120) supporting the hollow forming core to be located in the center and forming a flow port(121). The die housing has a fusion chamber(310) to integrate extruded billets passed through the flow port and a discharge hole(320) formed in the center of the fusion chamber to discharge the extruded drum pipe to the outside of the mold, and the die housing is installed on one side of the bridge. The extrusion forming member is installed in the fusion chamber and encloses the end of the core protruding out of the bridge to form thickness and shape of the drum pipe.