To provide a hydraulic forming method for a laminated plate and an apparatus therefor where, even in a preform having a hollow part, the reduction of the plate thickness in a flange part after forming does not occur.
In a state where a movable pad part 27 advancing and retreating with respect to a preform 10 in a cavity 23 is projected into the cavity 23, the preform 10 is abutted against the inner face of the movable pad part 27, so as to form a top wall Pa, further, the other part of the preform 10 is abutted against the inside face of the cavity 23 along thereto, so as to form a side wall Pb, liquid pressure is injected while gradually retreating the movable pad part 27, thus the side wall Pb is expanded while causing friction resistance between the side wall Pb and the inside face 23a of the cavity 23, the inflow of the material from a flange part F is suppressed, and then, forming is performed.
COPYRIGHT: (C)2009,JPO&INPIT
Noriaki Kawauchi
| JP7155857A | ||||
| JP2003211232A |
Yasuo Nara
Katsuyuki Utani
Ken Fujita
Masanori
Toshihiro Hasegawa