Production technology and selection of seamless tee

The tee is a type of pipe used at the branch of the pipeline. For the use of seamless pipes to manufacture tee, the currently commonly used processes are cold forming and hot pressing.

  1 Cold forming process

  The hydraulic bulging of the tee is a forming process in which the branch pipe is expanded by the axial compensation of the metal material. The process is to use a special hydraulic press to inject liquid into the tube blank with the same diameter as the tee, and to squeeze the tube blank through the two horizontal side cylinders of the hydraulic press. The pressure of the liquid increases as the volume of the tube becomes smaller. When the pressure required for the expansion of the three-way branch tube is reached, the metal material flows along the inner cavity of the mold under the dual action of the side cylinder and the liquid pressure in the tube blank to expand the branch tube.

   2 Hot pressing process

Three-way hot pressing is to flatten a tube blank larger than the diameter of the three-way to the size of the three-way diameter, and open a hole in the stretched branch tube; the tube blank is heated, placed in the forming die, and placed in the tube blank A punching die is inserted into the stretched branch pipe; the tube blank is radially compressed under the action of pressure. During the radial compression, the metal flows in the direction of the branch pipe and forms a branch pipe under the stretching of the die. The whole process is formed by the radial compression of the tube blank and the stretching process of the branch tube. Different from the hydraulic bulging tee, the metal of the hot-pressed tee branch is compensated by the radial movement of the tube blank, so it is also called the radial compensation process.