To enhance the joining strength of metal sheets by accelerating the formation of a protrusion protruded from a protrusion-shaped part by pressing.
The method includes a caulking step where a caulking part 6 for forming the protrusion 5 which is locked to the inner peripheral part 11a on another side face of a recess-shaped part 11 of the outer peripheral part 21a of a protrusion-shaped part 21 is made between the punch 3 and a die 4 with which the other side face of the protrusion-shaped part 21 by engaging recess-and protrusion-shaped parts 11, 21 which are formed in the end parts of two metal sheets 1, 2 each other and pressing one-side surface of the protrusion-shaped part 21. When performing the caulking step, the protrusion amount and thickness of the protrusion 5 are secured sufficiently by providing a relief part E for accelerating the protruding of the protrusion 5 in the locking part of the recess-shaped part 11 on the opposite side in the forming portion of the protrusion 5.
COPYRIGHT: (C)2010,JPO&INPIT
| JPH066702 | [Name of device] Laminated iron core |
| JPH08332532 | CALKING STRUCTURE |
SAITO MASAMOTO
MASHIMA SATOSHI
IGARASHI KATSUJI
MORITA TSUKASA
NAKAMURA KIMIHIKO
SEKI TOSHIHIRO
WATARI TOMOAKI
WATANABE TAKUJI
| JP2003080329A | 2003-03-18 | |||
| JP2007160360A | 2007-06-28 | |||
| JPS59179241A | 1984-10-11 | |||
| JP2003311547A | 2003-11-05 | |||
| JP2000288661A | 2000-10-17 |
Iwa Saki Kokuni
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu
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