PURPOSE:To reduce the loss of energy and to improve the efficiency and working property in working a metallic material generating superhigh pressure instantaneously, by unifying the hydraulic pressure generating section and forming section. CONSTITUTION:A metalic material is inserted into a forming die, and filled with liquid. Then, hammers 11, 11' are accelerated in upright cylinders 4, 4' by pneumatic pressure. Plungers 12, 12' are thrusted into the liquid to generate high hydraulic pressure in hydraulic pressure chambers 5, 5'. Generated high hydraulic pressure is transmitted from upper and lower liquid inlets 9, 9' of the forming section B to a hydraulic forming chamber through the shortest distance, and the metallic material is plastically worked. The die 15 is fitted to allow free separation to enable the metallic material in the working chamber 10 to go in and out. Thus, loss of energy is reduced and the efficiency and working property are improved.
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