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Patent Searching and Data


Title:
CONICAL SPRING AND APPARATUS FOR FORMING THE SAME
Document Type and Number:
Japanese Patent JP2009255139
Kind Code:
A
Abstract:

To provide an apparatus for forming a conical spring by which a highly accurate conical spring is obtained at high speed and at low cost by performing helical shearing work without having the slit width and forming of a spring in one process.

In an apparatus 1 for forming a conical spring which is provided with a one-turn coil (formed coil) 5, a power source means for energizing the one-turn coil 5 and a die 2 provided with a forming part 2A, electromagnetic force is generated by making the current flow to the one-turn coil 5 from the power source means in the state where a sheet 3 is interposed between the one-turn coil 5 and the die 2 and the sheet 3 is pressed against the die 2 by the electromagnetic force, and the forming part 2A is made by forming a helical shape into a mortar shape on the die 2.


Inventors:
MIYAZAKI HIROAKI
SHIMOJO TAKUTO
AIZAWA TOMOKATSU
OKAGAWA KEIGO
Application Number:
JP2008108436A
Publication Date:
November 05, 2009
Filing Date:
April 18, 2008
Export Citation:
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Assignee:
TOPRE CORP
International Classes:
B21D53/00; B21D26/14
Attorney, Agent or Firm:
Ryoichi Yamashita