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Patent Searching and Data


Title:
METHOD FOR MANUFACTURING CYLINDRICAL MEMBER
Document Type and Number:
WIPO Patent Application WO/2021/024572
Kind Code:
A1
Abstract:
In a method for forming, through a spinning process, a cylindrical member having a straight tube part and a reduced tube part that is adjacent to the straight tube part and has an axis that has at least a relationship of being eccentric, inclined, or twisted with respect to the axis of the straight tube part, and that has a final target shape having a portion protruding further outside than a virtual extension surface of the straight tube part, a first step is performed to cause a portion of a workpiece having a straight tube shape to protrude toward the outside of the virtual extension surface to an extent equal to or greater than the final target shape by making the pressing force on one side of the workpiece due to a processing tool smaller than the other side, and thereafter the final target shape is formed by reducing the difference in the pressing force between one side and the other side. Accordingly, the cylindrical member provided with the reduced tube part protruding outward from the virtual extension surface of the straight tube part can be more easily formed. The first step may involve a state where in at least a portion of a plurality of paths of the processing tool, the processing tool does not make contact with one side of the workpiece. At at least a path start point in the path, it is preferable that the processing tool presses the workpiece.

Inventors:
IWAMOTO HIROKAZU (JP)
HAYAKAWA HISASHI (JP)
KIMURA TSUNEHIKO (JP)
Application Number:
PCT/JP2020/019876
Publication Date:
February 11, 2021
Filing Date:
May 20, 2020
Export Citation:
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Assignee:
SANGO CO LTD (JP)
International Classes:
B21D22/14; B21D41/04; B21D53/84
Foreign References:
JPH11151535A1999-06-08
JP2003181554A2003-07-02
JP2003010935A2003-01-15
Attorney, Agent or Firm:
PROSPEC PATENT FIRM (JP)
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