The characteristics of the four screw thread pipe.

　　The four characteristics of screw thread pipe fittings threaded through the:

　　The four threaded hydraulic bulging is a forming process of metal materials by axial compensation expansion pipe. The process is to use special hydraulic machine, and four-way is equal to the diameter of the tube blank injection liquid, after hydraulic machine of two degrees of lateral cylinder synchronous motion extruded tube, tube extrusion volume change, the liquid in the billet tube with the tube billet volume became small and pressure rise, when arrived at the four-way branch expansion, the demand pressure, metal materials in the cylinder and the side tube blank inner liquid pressure on the dual role under along the mold cavity and expansion pipe. Screw thread pipe fittings series screw the hydraulic bulging process may be formed in one time, high in production efficiency; the supervisor and shoulder wall thickness were increased.

　　Due to the seamless four through the hydraulic expansion process required equipment tonnage is larger, the current domestic mainly used to be less than DN400 of the specification wall thickness of four links. It is suitable for cold hardening tendency of low carbon steel, low alloy steel, stainless steel, including some non-ferrous metal materials, such as copper, aluminum, titanium and so on.

　　Thread four-way hot embossing is will be greater than the diameter of tube blank, compressed to about four-way diameter size, open a hole in the tensile pipe parts; tube by heating, into the forming die and in the tube blank is loaded in the tensile pipe die; in under the action of pressure tube billet is radial contraction, in the process of radial contraction metal to the branch direction and in die tensile constitute a branch. The whole process is through the tensile process of billet and pipe parts and radial squeeze forming. Hydraulic expanding form four different, four-way branch of hot metal is by tube billet radial motion compensation, so it is also called the radial compensation process.

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