Abstract: An optimization design for internal pressure water bulging process of new type of stainless steel straigh-through pipe joints is introduced,the second water replenishment and the turbocharging technology is adopted to realize synchronous pressure supplement and precise positioning for mould,and overcome the difficulties in complicated internal high pressure water bulging process and hard to position precisely,which has resulted in bottleneck problems such as inconsistant wall adherence,poor forming quality and energy consumption and so on, energy-saving analysis and verification has been done as well.At the same time,sample machine has been made and after operation,it is found that the cost has been reduced significantly,and the pipe forming quality is high,which has proven that this plan is feasible,and has provided preferences for improvement of all kinds of water bulge forming process.

Key words: internal pressure, water bulge forming, synchronous pressure compensation, energy saving