To reduce the warp of a bottom plate 4 in a cooler 1 for a power device.
A cooler bottom plate 4, heat radiation fins 5, a cooler top plate 3, and a substrate for a power device (a DBA substrate) 2 are layered together with a brazing filler metal, and heated and joined by the brazing. In this condition, several recesses 10 having the depth in the direction orthogonal to the bottom surface of the cooler bottom plate 4 are formed in the bottom surface of the cooler bottom plate 4. In a brazing process, a plurality of locking tools 12 supported by a tool base stand 11 are inserted in the plurality of recesses 10 in the depth direction before starting the hardening of a brazed metal to regulate the motion (thermal shrinkage) of the cooler bottom plate 4 in the direction parallel to the bottom surface.
| JPS58128761 | 【考案の名称】半田付け部品取外し具 |
| JP4412915 | Flux transfer device and flux transfer method |
OTSUKA KENJI
Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda
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