Tube hydroforming is a process in which tubular sections of different geometries are produced from base circular tubes. At recent years, the use of hydroforming products in aircraft and automotive industries have been increased due to their advantages over products of conventional processes. Advantages of this process include an integrated product, reduced weight, high toughness and structural strength, lower-cost tools, less demand of additional treatment, and high dimensional precision. Tube hydroforming can be defined as a process which is started by a straight or bended tube.
Then tube ends are isolated and the tube is formed into the die-cavity as a result of the internal fluid pressure (Fig.1). Water is usually used with an anti-corrosion complementary for applying an internal pressure. …