三通的分类Classification of three links
国标、电标、化标、水标、美标、德标、日标、俄标等，具体如下：GB/T12459-2005,GB/T13401-2005,ASME B16.9,SH3408,SH3409-96,SH3410-96,HG/T21635,DL/T 695,SY/T 0510,DIN 2615。
Partition according to diameter
The ends of the connecting ends of equal diameter three links are all of the same size.
The diameter of the three way main pipe takes the same size, and the size of the branch pipe nozzle is smaller than the nozzle size of the main pipe.
According to process division
1. hydraulic bulging
The three way hydraulic bulging is a forming process that expands the branch pipe by axial compensation of metal material. The process is to use a special hydraulic press to inject liquid into the pipe billet equal to the three pass diameter. Through the two horizontal cylinders of the hydraulic press, the tube blank is extruded synchronously, the volume becomes smaller after the extrusion of the tube, and the pressure of the liquid in the tube billet increases with the volume of the tube, when the pressure is needed to reach the three pipe. Under the action of the liquid pressure in the side cylinder and the tube blank, the metal material flows along the inner cavity of the die and expands the branch pipe.
The three way hydraulic bulging process can be formed at one time, and the production efficiency is higher. The head and shoulder wall thickness of the three links increase.
Because of the large tonnage of the hydraulic bulging process with seamless three links, the current domestic manufacture is mainly used for the standard wall thickness of less than DN400 three links. The suitable forming materials are low carbon steel, low alloy steel and stainless steel, which have relatively low cold hardening tendency, including some nonferrous metal materials, such as copper, aluminum, titanium and so on.
2. hot pressing forming
The three way hot pressing is to flatten the tube blank with a diameter greater than three diameters to about three diameters.
Cold - drawn three - way
Cold - drawn three - way
A hole is opened in the part of the drawing branch; the tube is heated to be put into the forming die and loaded into the die in the tube blank; the tube is compressed in radial direction under the action of pressure, and the metal flows into the direction of the branch pipe during the radial compression and forms a branch under the tension of the die. The whole process is formed by the radial compression of the billet and the drawing process of the branch. Unlike the hydraulic bulging three way, the metal of the hot pressing three way branch pipe is compensated by the radial movement of the tube blank, so it is also called the radial compensation process.
Due to the use of heating to suppress three passes, the equipment tonnage required for material forming is reduced. The three - pass hot press is suitable for the material with wide adaptability to low carbon steel, alloy steel and stainless steel, especially for the three through thick diameter and tube wall, which is usually used in this forming process.
Carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon leaching, PVC and so on.
Dividing by making methods
Top making, pressing, forging, casting, etc.
Dividing by manufacturing standards
The national standard, the electric standard, the standard, the water mark, the American Standard, the German standard, the Japanese standard, the Russian standard and so on, as follows: GB/T12459-2005, GB/T13401-2005, ASME B16.9, SH3408, SH3409-96, SH3410-96, HG/T21635, DL/T 695, SY/T 0510, DIN 2615.