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Title:
THICKENING PROCESSING METHOD OF HOLE END PART
Document Type and Number:
Japanese Patent JP2016073995
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a thickening processing method of a hole end part capable of thickening the end of a hole, while maintaining accurately an inner surface shape of the hole, and reducing waste of a material.SOLUTION: A prepared hole 11 is punched out through a metal plate 10, and the prepared hole 11 is burring-processed to form a rising part 12 on the periphery of the prepared hole. A guide rod 15 is inserted into the center of the rising part 12, and a ring-shaped punch 16 is lowered to crush the rising part 12, and to thereby form a thickened part 17 on the periphery of the prepared hole. The thickness of the thickened part 17 can be controlled by a height H of the rising part.SELECTED DRAWING: Figure 2

Inventors:
SATO KOICHI
NAKAZAWA YOSHIAKI
Application Number:
JP2014205449A
Publication Date:
May 12, 2016
Filing Date:
October 06, 2014
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
International Classes:
B21D35/00; B21D19/08
Domestic Patent References:
JP2000135539A2000-05-16
JPH01143725A1989-06-06
JP2010142865A2010-07-01
JP2002239663A2002-08-27
JP2001286961A2001-10-16
Attorney, Agent or Firm:
Sekine/Yamamoto Patent Office