HEBEI PENGXIN PIPELINE EQUIPMENT GROUP CO.,LTD |
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ASTM A234 Grade WPB Carbon Steel Bend, Hot Rolled, 4IN, 45 Deg, 10D, Pipe Connection.
The pipe bender bends like the sheet metal. Under the condition of
pure bending, when the pipe with outer diameter of D, wall
thickness of t is bent by the action of external moment M, the
outer wall of neutral layer is subjected to tensile stress σ1, and
the inner wall of neutral layer is subjected to tensile stress. The
wall becomes thicker. Moreover, the shape of the cross section
changes from circle to approximate ellipse due to the action of
force F1 and F2. When the deformation is too large, the outer wall
will crack and the inner wall will wrinkle.
The degree of deformation of the pipe depends on the relative
bending radius R/D and the relative thickness t/D The smaller the
value, R/D and t/D, the greater the degree of deformation. In order
to ensure the forming quality of pipe fittings, the degree of
deformation must be controlled within the permitted range. The
bending forming limit of pipe material depends not only on the
mechanical properties and bending methods of the material, but also
on the use requirements of pipe fittings. The forming limit of pipe
fittings shall include the following:
(1) The maximum elongation deformation in the lateral tensile
deformation zone of the neutral layer does not exceed the plastic
allowable value of the material, resulting in rupture;
(2) In the inner compression deformation zone of the neutral layer,
the thin-walled structure subjected to tangential compressive
stress does not wrinkle beyond instability;
(3) Control the distortion of the pipe section if the pipe has the
requirement of ellipticity;
(4) Control the forming limit of wall thickness thinning if the
fittings have strength requirements to withstand internal pressure.
Chinese name | siphonium;bend;elbow;angle branch;syphon | classify;classification;assortment | Cold simmer and hot push |
Foreign Language | bend | paraphrase | Bending with a complete set of bending dies |
property;quality;character;nature | steel pipe;steel piping;steel tube;steel tubing | Main Origin | Capital of pipe fittings of Mengcun elbow in Cangzhou City, Hebei Province |