Title:
METHOD FOR FORMING YOKE PART OF SHAFT JOINT FOR VEHICLE STEERING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2015/186903
Kind Code:
A1
Abstract:
The objective of the present invention is to form a yoke part at one end portion of a shaft joint for a vehicle steering system and extend the use lifespan of an extrusion punch by reducing a forging extrusion load of the extrusion punch for forming the yoke part. To this end, the present invention comprises: a chamfer forming step for forming a chamfered part on one side of the material by supplying, to a die, a material cut into a predetermined length and pressing the material with a punch; an extrusion molding step for forming a shaft and a head part by transferring and supplying the material to an extrusion molding die by pressing the material with the punch; a preliminary forming step for forming a preliminary yoke at one side of the shaft by transferring and supplying the material to a preliminary forming die and pressing the material with the punch; a yoke part forming step for forming the yoke part at one side of the shaft by transferring and supplying the material to a yoke forming die and pressing the material with the punch, wherein a square inclined surface is formed in the formed yoke part by using a square punch when the yoke part is formed, so as to reduce a pressing load of the punch such that the durability of a punch mold is improved; and a spline forming step for forming splines on the shaft by supplying the material to a spline forming die and pressing the material with the punch.
Inventors:
KIM JUNG HYUN (KR)
Application Number:
PCT/KR2015/003808
Publication Date:
December 10, 2015
Filing Date:
April 16, 2015
Export Citation:
Assignee:
SUNGJIN FO MA INC (KR)
International Classes:
B21D28/14; B62D1/16
Foreign References:
| JP2012051068A | 2012-03-15 | |||
| KR101029220B1 | 2011-04-14 | |||
| KR100767105B1 | 2007-10-12 |
Attorney, Agent or Firm:
PARK, JUNG HO (KR)
박정호 (KR)
박정호 (KR)
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