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Title:
METHOD FOR SOFTENING ALUMINUM OR ALUMINUM ALLOY MEMBER AND WORKPIECE SUITABLE FOR PARTIAL SOFTENING
Document Type and Number:
Japanese Patent JP2011190518
Kind Code:
A
Abstract:

To provide a method for softening an aluminum or aluminum alloy member, by which a work-hardened part of the workpiece made of aluminum or aluminum alloy can be locally and efficiently softened, and the workpiece suitable for partial softening.

The workpiece 2 made of aluminum or aluminum alloy has an outer flange 22, inner flange or a flange at its end. The outer flange 22, the inner flange or the flange is bent with a radius of curvature with respect to a base 20. In the outer flange 22, the inner flange or the flange, the length l from a bent part 22 to the tip is ≥1 mm, and the radius of curvature R at the bent part 22 corresponds to ≥1/3 of the thickness t of the base 20. By applying electric current to an induction heating coil 1 disposed close to the workpiece 2, the workpiece 2 is locally softened by induction heating, particularly at the arc-like bent part 22.


Inventors:
KAITOKU KAZUMASA
IMAMURA YOSHIHAYA
HORIGUCHI KAZUSHIGE
Application Number:
JP2010059714A
Publication Date:
September 29, 2011
Filing Date:
March 16, 2010
Export Citation:
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Assignee:
KOBE STEEL LTD
International Classes:
C22F1/04; B21D26/14; H05B6/10; C22F1/00
Domestic Patent References:
JPS5554228A1980-04-21
JP2000515432A2000-11-21
Attorney, Agent or Firm:
Masanori Fujimaki