由于化工、发电设备热交换器的可靠性日益提高,胀管器的研制工作已趋于实际应用。过去采用滚子胀管法即利用滚子的滚压作用进行胀接,管子内表面往往容易加工硬化。在胀管过程中,管子受到连续往返的变形,由于受到双重作用力而使管壁减薄,有时甚至在管子内表面会产生微裂纹。此外,一般管子还可能会产生加工残余应力,而降低耐腐蚀性能。 Due to the increasing reliability of heat exchangers in chemical industry and power generation equipment, the development of the expander has become more and more practical. In the past the use of roller expansion method that is the use of rolling roller expansion joint, the inner surface of the tube is often easy to work hardening. During the expansion process, the pipe is subject to continuous round-trip deformation, thinning the pipe wall due to double forces and sometimes even microcracking on the inner surface of the pipe. In addition, the general pipe may also produce machining residual stress, and reduce corrosion resistance.