To propose hydroforming equipment and a hydroforming method by which the loading passage of hydroforming is simply determined.
In this hydroforming method, the processes from a first step to a third step are repeated until all contact is sensed with touch-sensitive sensors. The first step where pipe ends are pushed axially in the state where the internal pressure is held at a fixed value by using a hydroforming die in which touch-sensitive sensors which are possible to determine the contact with a metallic pipe are mounted in at least two or more different positions in the axial direction of the pipe in the inside of a die and the progress of the axial pushing is stopped when a non-contact touch-sensitive sensor which is mounted in the nearest position by the end of the pipe senses the contact with the metallic pipe is performed. Next, the second step where only the internal pressure is raised as fixing the position of the pipe end and the rising of the internal pressure is stopped when the contact is determined with at least one of the non-contact touch-sensitive sensors is performed. Successively, the third step where the internal pressure is lowered to the value before raising as fixing the position of the pipe end is performed.
SATO KOICHI
WADA MANABU
KURIYAMA YUKIHISA
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nakamura Asayuki
Nagasaka Tomoyasu
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