The 90 ° double socket bend is bent with a complete set of bending equipment, which is divided into two processes: cold simmer and hot push. No matter what kind of machinery, equipment and pipelines, most of them use 90 ° double socket bends, which are mainly used for oil, gas, infusion, engineering bridge construction, etc.
The deformation degree of the pipe depends on the relative bending radius R/D and the relative thickness t/D values. The smaller the R/D and t/D values, the greater the deformation degree. For the forming quality of pipe fittings, the degree of deformation shall be controlled within the allowable range. The bending forming of pipe fittings depends not only on the mechanical properties of materials and bending methods, but also on the use requirements of pipe fittings. The forming of pipe fittings shall include the following contents:
(1) The elongation deformation in the tensile deformation zone outside the neutral layer does not exceed the allowable plastic value of the material, resulting in cracking;
(2) In the compression deformation zone at the inner side of the neutral layer, the thin-walled structure under the action of tangential compressive stress will not wrinkle beyond instability;
(3) If the pipe fitting has the requirement of ovality, control the distortion of its section;
(4) If the pipe fittings have strength requirements to withstand internal pressure, the forming of wall thickness reduction shall be controlled.
