一、Divided by pipe diameter
The connecting ends of the equal-diameter tees are all the same size; the main pipes of the reducing tees have the same size, while the branch pipes are smaller than the main pipe.
二、Divided by process
1. Hydraulic bulging
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. The two horizontal side cylinders of the hydraulic press synchronize the centering movement to extrude the tube blank. After the tube blank is squeezed, the volume becomes smaller and the inside The liquid pressure rises 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.
The hydraulic bulging process of the tee can be formed at one time, and the production efficiency is high; the wall thickness of the main pipe and the shoulder of the tee are increased. Due to the large tonnage of equipment required for the hydraulic bulging process of seamless tee, it is mainly used for the manufacture of tee with standard wall thickness less than DN400 in China. The applicable forming materials are low-carbon steel, low-alloy steel, and stainless steel with a relatively low tendency of cold work hardening, including some non-ferrous metal materials, such as copper, aluminum, and titanium.
2. Hot press forming
Tee hot press forming is to flatten the tube blank larger than the diameter of the tee to the size of the diameter of the tee.
3. Cold drawn tee
Open a hole in the stretched branch tube; the tube blank is heated, put into the forming die, and the punching die for the stretched branch tube is installed in the tube blank; the tube blank is radially compressed under the action of the pressure, and the tube blank is compressed in the radial direction. During the process, the metal flows in the direction of the branch pipe and forms the 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.
As the tee is pressed after heating, the tonnage of equipment required for material forming is reduced. Hot-pressed tee has a wide adaptability to materials, and is suitable for low-carbon steel, alloy steel, and stainless steel; especially for tee with large diameter and thicker tube wall, this forming process is usually used.
三、Divided by material
Carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon leaching, pvc, etc.
四、Divided by production method
Topping, pressing, forging, casting, etc.
五、Divided by manufacturing standards
National standard, electrical standard, chemical standard, water standard, American standard, German standard, Japanese standard, Russian standard, etc., as follows: GB/T12459-2017, ASME B16.9, SH3408, SH3409-96, SH3410-96, HG/ T21635, DL/T695, SY/T 0510, DIN 2615.
