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Title:
METHOD FOR MANUFACTURING ENGINE VALVE, AND UPSETTER THEREFOR
Document Type and Number:
Japanese Patent JP2007203315
Kind Code:
A
Abstract:

To secure the shape precision of a finally manufactured engine valve while keeping an axial straightness of a first intermediate body formed from a bar-shaped work.

The method for manufacturing the engine valve comprises; a first process (a blank cut-off) for forming a fixed size of the bar-shaped work 6 by cutting off the bar-shaped work 6; a second process (upsetting) for forming the primary intermediate body 7 having dumpling-state expanding diameter part 7a by upsetting the one end part of the bar-shaped work 6 while heating it; a third process (forging) for forming the secondary intermediate body 8 having the original shape near the engine valve by forging the primary intermediate body 7; and a forth process (annealing, strain-removing, before-processing, surface treatment and pre-processing). Especially, in the forge-compacting processing in the secondary process, the bar-shaped work 6 is pressed in the axial direction toward the metallic mold with a pressing element while holding with a holding body through a prescribed gap.

COPYRIGHT: (C)2007,JPO&INPIT


Inventors:
AKAI TAKAAKI
Application Number:
JP2006022437A
Publication Date:
August 16, 2007
Filing Date:
January 31, 2006
Export Citation:
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Assignee:
AISAN IND
International Classes:
B21J9/08; B21J5/08; B21K1/24
Attorney, Agent or Firm:
Patent Business Corporation Cosmos Patent Office