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Title:
VARIABLE BLADE MANUFACTURING METHOD AND VARIABLE BLADE IN VGS TYPE TURBO CHARGER
Document Type and Number:
WIPO Patent Application WO/2003/014548
Kind Code:
A1
Abstract:
A variable blade manufacturing method based on plastic working technology capable of minimizing cutting and welding operations in manufacturing variable blades assembled in a VGS type turbo charger, comprising the steps of punching out a blank material from a metal material with an approximately constant plate thickness to form a raw material (W) forming the prototype of the variable blades (1), holding the raw material (W) by a pair of opposed molds, molding blade parts (11) and shaft parts (12) to specified shapes, trimming non−product portions projected from product portions, pressing the shaft parts (12) of the raw material (W) against a pair of dies to roll to a specified diameter so as to bring the shape and dimensions of the raw material into the state of a near net shape nearing the specified variable blades, characterized in that, when the variable blades (1) are finished to a blade height of the variable blades (1) equal to the blade width dimension of the variable blades (1), the raw material (W) formed in the state of the near net shape is held and pressed by a pair of opposed molds to realize the accuracy of the blade height in a completed state.

Inventors:
OHISHI SHINJIROH (JP)
Application Number:
PCT/JP2002/007942
Publication Date:
February 20, 2003
Filing Date:
August 02, 2002
Export Citation:
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Assignee:
SOGHI KOGYO CO LTD (JP)
OHISHI SHINJIROH (JP)
International Classes:
B21H7/16; B21K3/04; B23P15/02; F01D17/16; F02B37/24; (IPC1-7): F02B37/12; B21H7/16; B21K3/04; F02B39/00
Foreign References:
JP2000301283A2000-10-31
JPH11151542A1999-06-08
JPH05123808A1993-05-21
JP2000301283A2000-10-31
Other References:
See also references of EP 1422400A4
Attorney, Agent or Firm:
Higashiyama, Takahiko (Chisan Mansion Hontori 23-1, Hontori 3-chom, Shizuoka-shi Shizuoka, JP)
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