Document Type and Number:
Japanese Patent JPS6358056
Kind Code:
B2
Abstract:
A method of forming an extrusion die comprises forming an extrusion aperture 11 in a die piece 10, forcing a flowable materiat 14 partly through the extrusion aperture so that the leading surface of the material becomes deformed in the extrusion direction, and then removing the exposed surface of the extrusion aperture 11. by chemical or electro-etching, so that the effective axial bearing depth of the extrusion aperture at any location around its periphery corresponds to the deformation of the leading surface of the flowable material at that location. The axial bearing depth of the completed die at any location is thus inversely proportional to the resistance to flow at that location, resulting in substantially uniform flow over the whole of the die aperture.
Inventors:
DEIBITSUDO EDOWAADO SUCHUAATO
JOOJI RICHAADO NIKORUSON
JOOJI RICHAADO NIKORUSON
Application Number:
JP9222083A
Publication Date:
November 14, 1988
Filing Date:
May 25, 1983
Export Citation:
Assignee:
HOBUSON LTD
International Classes:
B29B7/00; B21C25/10; B23P15/24; B29C47/00; B29C48/30