1. Hydraulic expansion
The hydraulic expansion of tee is a forming process in which the branch pipe is expanded by axial compensation of metal material. The process is to use a special hydraulic press, and the diameter of the three tube billet into the liquid, through the hydraulic press two horizontal side cylinder synchronous movement extrusion tube billet, tube billet after the extrusion volume becomes smaller, the liquid in the tube billet with the volume of the tube billet decreases and the pressure rises, when the three tube branch pipe expansion required pressure, Under the double action of the liquid pressure in the side cylinder and the tube blank, the metal material flows along the inner cavity of the die and expands the branch pipe.
The hydraulic bulging technology of tee can be formed at one time, and the production efficiency is high. The wall thickness of the head and shoulder of the tee has increased.
Due to the large tonnage required by the hydraulic bulging process of seamless tee, it is mainly used in the manufacture of tee with standard wall thickness less than DN400 in China. The forming materials are low carbon steel, low alloy steel, stainless steel, including some non-ferrous metal materials, such as copper, aluminum, titanium and so on.
