Hydraulic bulging
The hydraulic bulging of tee is a forming process of expanding branch pipe by axial compensation of metal materials. The process is to use a special hydraulic press to inject liquid into the tube blank with the same diameter as the tee, and extrude the tube blank through the synchronous centering movement of two horizontal side cylinders of the hydraulic press. The volume of the tube blank becomes smaller after being extruded, and the pressure of the liquid in the tube blank increases as the volume of the tube blank becomes smaller. When the pressure required for the expansion of the tee branch pipe is reached, the metal materials flow along the inner cavity of the mold under the dual effect of the side cylinder and the liquid pressure in the tube blank and expand the branch pipe.
The hydraulic bulging process of tee can be formed at one time with high production efficiency; The wall thickness of the main pipe and shoulder of the tee increased.
As the hydraulic bulging process of seamless tee requires large tonnage of equipment, it is mainly used for the manufacture of standard wall thickness tees smaller 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, titanium, etc.
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