Title:
ENERGIZING CAULKING METHOD FOR ALUMINUM ALLOY CASTING
Document Type and Number:
Japanese Patent JPH1177192
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To join an aluminum alloy casting to an opponent material with a sound caulked part not having a crack, a fusion, etc. SOLUTION: An aluminum alloy casting is laid on an opponent material in a state that a caulking protrusion 2 arranged to the aluminum alloy casting 1 is fitted into a hole part 4 of the opponent material 3. The aluminum alloy casting 1 including the caulking protrusion 2 is sandwiched between a pair of electrodes 5, 6, while pressing the aluminum alloy casting 1, energizing heating is repeated several times while interposing a non-energizing period and a low current energizing period. In energizing heating, a supply current and an energizing time are adjusted so that the protrusion 2 has a temp. of < the fusion temp. Between a non-energizing period and a low current energizing period, a time is adjusted so that the protrusion 2 is kept at >=250 deg.C. The welding force applied to the protrusion 2 is adjusted to a value that a pressing stress obtained by dividing the welding force with a cross sectional area of the protrusion 2 is smaller than a proof stress of a material to be caulked at a normal temp. in order to prevent the protrusion 2 from deforming in a low temp. range where the deformation ability is poor.
Inventors:
MAKITA SHINYA
HOTTA MOTOJI
HORI HISASHI
HOTTA MOTOJI
HORI HISASHI
Application Number:
JP24537097A
Publication Date:
March 23, 1999
Filing Date:
September 10, 1997
Export Citation:
Assignee:
NIPPON LIGHT METAL CO
International Classes:
H05B3/00; B21D39/00; B21D39/03; (IPC1-7): B21D39/00; B21D39/03; H05B3/00
Attorney, Agent or Firm:
Wataru Ogura