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Patent Searching and Data


Title:
METHOD FOR MACHINING STEEL MATERIAL
Document Type and Number:
Japanese Patent JPH05285562
Kind Code:
A
Abstract:

PURPOSE: To provide a method for processing steel material by which lightening holes are formed even in steel material high in strength and small in elongation such as SS materials and in which cracks are hardly occurred around the lightening holes after they are formed.

CONSTITUTION: By previously boring elliptic holes without corners on the steel material 17 and stretching this steel material 17 in the direction perpendicular to the longitudinal direction of the holes, the web 17A of the steel material 17 is subjected to plastic deformation, and the lightening holes 20 stretched from the holes are formed on the steel material 17.


Inventors:
YOSHIDA KAZUYOSHI
Application Number:
JP9455392A
Publication Date:
November 02, 1993
Filing Date:
April 14, 1992
Export Citation:
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Assignee:
MISAWA HOMES CO
International Classes:
B21D28/24; B21D31/04; B21D35/00; E04C3/08; (IPC1-7): B21D35/00; B21D28/24; B21D31/04; E04C3/08
Domestic Patent References:
JPS5841641A1983-03-10
JPS5775229A1982-05-11
Attorney, Agent or Firm:
Shinzo Kinoshita (2 outside)