Thin-wall steel tube

Thin-walled steel tube are made by cold drawing. Which is applicable to the general structure of carbon steel, low alloy steel, alloy steel thin-walled tube, mechanical structures; thin-walled fluid steel pipes used to transport general fluid; stainless steel thin-walled tube used in the chemical, petroleum, light industry, food, mechanical instruments industrial heat-resistant container, pipeline and mechanical structures. 

A wide range of thin-walled tube refrigeration, mechanical, chemical, and other industries, mass production of thin-walled tube bender Cold Roll Forming thin-walled steel wall support Destabilizing Critical lower curved portion often appear deflated wrinkles and other deformation defects. These defects not only weaken the strength of the steel pipe, reducing its carrying capacity, but also cause the velocity unevenness of the flowing medium in the tube, resulting in the vortex and the curved parts of the accumulation of dirt, affecting the normal use of the elbow, thus eliminating elbow defects became Elbow The biggest difficulty, we must attach great importance to. 
The thin-walled steel pipe bending force and deformation analysis 
When the bending of the thin-walled steel tube, the tube bending deformation under external force under tensile stress, and its outer edge of the bent portion of the wall thinning, while the edge under compressive stress in the tube wall thickening. Since the tensile stress and the compressive stress of the inner edge force in the bending process of the tube, the outer edge to the central role, resulting in the larger diameter of the bent portion of the tube in a horizontal plane, the vertical surface of the reduced diameter, oval appears. Meanwhile, the improper bending mold arc slot parameter selection, you can not play a role in wall enhanced bending parts, the inner edge of the tube under compressive stress, lower critical force due to wall instability arising wavy folds. From the above analysis: the thin-walled steel bending easy produce deflated wrinkle defects. Therefore, the design of thin-walled steel pipe bending mold, must be reasonable to determine the structural parameters, so that bending of the steel pipe, in the mold under the action of the tube to produce a pre-rection force, in order to offset the deformation of the ellipse is generated when the bending of the thin-walled steel, bent portion deflated wrinkled defects reasonable control.