| 摘要 |
PURPOSE:To improve the efficiency in forming and the quality of a product by providing the booster for ordinary forming and for repeatedly pressurizing and working in repitition the booster for repeatedly pressurizing via a primary reducing valve and secondary reducing valve as well. CONSTITUTION:The boosters 16, 17 for ordinary forming and repeatedly forming are connected in parallel between a water supply pipe line 4 and pipe line 4, and the primary and secondary reducing valves 14, 15 of a pressure reducing device 13 are respectively arranged in parallel on a pipe line 12 as well. In the case of ordinary forming it is performed by maintaining the pressure constantly with the intermittent work of the booster 16 via the driving of a water supply pump 3. In the case of a repeat pressure forming the booster 16, 17 are simultaneously worked to perform the forming by repeating the force ascent and descent in plural times within the set pressures of the primary and secondary reducing valves 14, 15. The forming body of compact structure is thus obtd. without increasing the forming pressure to improve the forming efficiency and product quality.
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