Bulging of stainless pipe cross

　　The bulging of Butt Welding Pipe Fitting Straight Cross is a kind of forming process of expanding branch pipe by axial compensation of metal material. The process is to use a special press to inject liquid into the tube blank with the same diameter as the four-way pipe, and extrude the tube blank through two horizontal side cylinders of the hydraulic press synchronously. The volume of the tube blank becomes smaller after being extruded, and the pressure of the liquid in the tube blank increases with the volume of the tube blank becoming smaller. When the pressure required by the expansion of the four-way pipe is reached, the liquid pressure in the side cylinder and the tube blank of the metal material is double Under the heavy action, the branch pipe flows along the inner cavity of the mold and expands.

　　The bulging process of the cross can be formed in one time with high production efficiency; the wall thickness of the main pipe and shoulder of the cross is increased. Due to the large tonnage of equipment required for the hydraulic bulging process of seamless cross, it is mainly used for the manufacture of standard wall thickness cross less than dn400 in China at present. 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.