| 摘要 |
PROBLEM TO BE SOLVED: To prevent buckling, thinning or bursting and to obtain a bulged product having excellent quality by controlling a shaft pushing quantity and a forming inner pressure in accordance with a proper relation between the shaft pushing quantity and the forming inner pressure which is preliminarily obtained. SOLUTION: Hydraulic bulging is executed by applying an inner pressure while compressing a metallic tube stock 7 in the axial direction with shaft pushing tools 3, 4. Thereupon, the forming inner pressure is set and controlled with a forming inner pressure setting device 12 and a pressure generating device. The shaft pushing quantity is set and controlled with first, second shaft pushing position setting devices 13, 14 and shaft pushing cylinders 1, 2. With respect to input and output signals into and from a controller 20, a set value and a detected value of the forming inner pressure are respectively expressed by Ps anti Pi, and a set value and a detected value of the shaft pushing quantity are respectively expressed by Xs1, Xs2 and Xi1, Xi2. A proper relation between the shaft pushing quantity Xs1 and the forming inner pressure Ps is preliminarily obtained. And the shaft pushing quantity and the forming inner pressure are controlled using the controller 20 in accordance with the relation.
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