Extrusion molding method and extrusion molding device null of twisted

摘要

PURPOSE: To provide a method and device for extruding a twisted body by which the pitch of twist of formed product to be extruded from a die is shortened and the under fill in the cross-sectional shape is prevented. ;CONSTITUTION: In an extruding method of the twisted body that is made so as to extrude a material 15 to be formed from a die 2 in which a spiral-shaped profile 3 for forming is carved, a freely rotatable mandrel 10 is provided in the center part of the die 2 along the extruding direction and the material 15 to be formed is extruded while revolving the mandrel 10 in the spiral direction of the profile 3 for forming.;COPYRIGHT: (C)1994,JPO