Hydraulic forming process, hydraulic forming device and...

Metal deforming – By application of fluent medium – or energy field – With actuated tool engaging work

Reexamination Certificate

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Reexamination Certificate

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06938449

ABSTRACT:
By using a hydraulic forming device20, a metal plate body11is placed on a support section21bwith a hollow section21aformed on a lower die21filled with hydraulic fluid A. Subsequently, a blank holder23is lowered to clamp the peripheral edge section of the placed metal plate body11with the support section21b. Then, the upper die22is lowered relative to the lower die21to pressedly deform the central section of the metal plate body11and to compress the hydraulic fluid A to increase the fluid pressure. A rib-like convex section12is transferred onto the metal plate body11by the increased fluid pressure of the hydraulic fluid A and a formed section22a. Further, the fluid pressure of the hydraulic fluid A is kept for a predetermined time. Then, the increased fluid pressure of the hydraulic fluid A is released.

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