| 摘要 |
PROBLEM TO BE SOLVED: To adjust the clamping force of a blank holder so that the inflow of a plate is optimized according to the forming shape during the sequential forming operation. SOLUTION: A plate 1 is placed on a supporting base 2, and the periphery of the plate is fixed by clamps 4 via the blank holder 3 divided into a plurality of components. Each clamp 4 changes the clamping force of the blank holder 3 by the hydraulic pressure of a hydraulic cylinder 8, and each hydraulic cylinder 8 individually controls the hydraulic pressure via a control valve 10 by a hydraulic controller 15. The hydraulic controller 15 determines the optimum hydraulic pressure based on the three-dimensional data of the forming shape stored in a computer 16 and real time position information of a bar-shaped pressing member 17. COPYRIGHT: (C)2003,JPO
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