Tee is also called pipe tee or tee pipe fitting, tee joint and so on. It is mainly used to change the direction of the fluid, and is used at the main pipe branch. It can be classified according to the pipe diameter. Generally made of carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon, pvc and other materials.
The hydraulic bulging of the tee is a forming process that expands the branch pipe through the axial compensation of the metal material. The process is to use a special hydraulic machine to inject liquid into the tube blank equal to the diameter of the tee, and squeeze the tube blank through the centering movement of the two horizontal side cylinders of the hydraulic machine. After the tube blank is extruded, the volume becomes smaller and the tube As the volume of the tube blank becomes smaller, the pressure rises. When the pressure required to swell the tee branch tube is reached, the metal material flows along the cavity of the mold under the double action of the liquid pressure in the side cylinder and the tube blank to expand the branch tube.
The hydraulic bulging process of the tee can be formed at one time, and the production efficiency is high; the wall thickness of the tee's main pipe and shoulder are increased.
Due to the large tonnage of the equipment required for the hydraulic bulging process of the seamless tee, it is mainly used in the manufacture of standard wall thickness tees less than DN400 in China. The applicable forming materials are low carbon steel, low alloy steel and stainless steel with relatively low cold work hardening tendency, including some non-ferrous metal materials such as copper, aluminum and titanium.
