Title:
DIE FOR EXTRUSION FORMING OF METAL MATERIAL AND CRYSTAL FINING METHOD OF METAL MATERIAL USING THE DIE
Document Type and Number:
Japanese Patent JP2018149547
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a die for extrusion forming of metal material which permits fining of a crystal by efficiently applying a shear strain to metal material and can improve strength of the material without injuring tenacity even when addition of rare metal or the like is not performed.SOLUTION: An extrusion forming course 11 for performing extrusion forming of a columnar metal material includes: a material charging part 12 which arrives at an outlet of the extrusion forming course 11 and assumes a columnar shape; a material cross-section deformation part 13 which is provided successively on the material charging part 12 and deforms the metal material from a circular cross-section to an elliptical shape; a non-linear torsion part 14 causing the metal material deformed to the elliptical shape on the material cross-section deformation part 13 to assume a torsion shape which gradually increases a torsion rate while retaining the elliptical shape; and a cross-section shape recovery part 15 for recovering a shape of the metal material which gets to the elliptical shape while retaining such a state that rotation of the outlet of the non-linear torsion part 14 is not hindered to the columnar shape.SELECTED DRAWING: Figure 1
Inventors:
MIYAMOTO HIROYUKI
KOMADA NAOKI
KOMADA NAOKI
Application Number:
JP2017045565A
Publication Date:
September 27, 2018
Filing Date:
March 10, 2017
Export Citation:
Assignee:
DOSHISHA
International Classes:
B21C25/02; B21C23/08
Attorney, Agent or Firm:
Katsunori Sugimoto
Mitsuhiro Okada
Mitsuhiro Okada