Reasons of causing shape defects of the retaining ring by hydraulicexpanding and principles and methods of sizing the shape are briefly presented.
本文扼要介绍了护环液压扩胀时产生形状缺陷的原因及校正的原理与方法。
2
Thermal expansion Pipe adopted by two-step pipe mill set for expansion cone-type mold Expanding skills numerals medium-frequency induction heating skills skills in a hydraulic machine.
热扩钢管采纳的二步促进式扩管机集锥模扩径技能，数目字中频感应加热技能，液压技能于一机。
3
The principle of ultra - high pressure hydraulic tube expanding technology for liquid bag type expander is addressed in this article anddeveloping process for this new equipment has been discussed.