| 摘要 |
PURPOSE:To provide an tube extrusion mold capable of further improving the dimensional accuracy such as roundness, straightness or cylindricality of a molded tube. CONSTITUTION:The length DELTAL in the extrusion direction of the molding area 11c in a nozzle die part 1 is set to limited length and the leading end part going toward the extrusion direction of a core metal part 22 in a mandrel part 21 is allowed to protrude by deltaL from the surface surrounded by the molding area 11c toward the extrusion direction. |
