Feasibility study of resistance hydro rotary draw bending of commercial pure titanium tubes

This is a feasibility study of resistance hydro rotary draw bending of titanium tubes with small and critical bending ratios. A heating resistance device was designed and fabricated for bending titanium tubes with a fluid mandrel. The results show that with simultaneous application of resistance heating and fluid pressure in the tubes during the rotary bending process, the springback and ovality of the tubes cross-section at bending area decreased, and the wrinkles in the bending area were evenly distributed. It was also observed that increasing the pressure at 120 bar and heating the tube to a temperature of 300 °C, reduced the cross-sectional distortion. Finally, it will be shown that the proposed new process can be used for bending titanium tubes and the minimum distortion of the cross-section at 100 bar and 400 °C was obtained 2.1 %.