A bending device for thin-walled metal pipes

Abstract

A bending device for thin-walled metal pipes, comprising an inner support, an upper die, and a lower die; the mold cavity of the upper die and the lower die in a mold-closed state is adapted to the bent metal pipe; the inner support is adapted to the metal pipe The inner support includes a number of support beads connected in series on the soft rod through through holes, the diameter of the support beads matches the inner diameter of the lumen; a number of sliding beads with a diameter larger than the diameter of the through hole are arranged at intervals on the soft rod, and The sliding balls are placed in the sliding cavity provided along the through hole inside the supporting beads; with the midpoint of the soft rod as the center point, when the inner support fits the bent metal tube, the supporting beads are adjacent in turn and the sliding beads are placed on the sliding The side of the cavity near the center point. The inner support plays the role of supporting, preventing deformation and assisting bending in the metal pipe; by introducing lubricating fluid into each contact surface, the friction force between the contact surfaces is reduced, and the thin wall of the metal pipe is protected. The metal tube is limited by the fixing ring, which ensures stable bending, prevents excessive deformation of the tubes at both ends, improves the bending accuracy, and has strong practicability and wide applicability.

Description

technical field [0001] The invention relates to a bending device, in particular to a bending device for thin-walled metal pipes. Background technique [0002] In the prior art, there are usually three main methods of bending metal pipes: rolling bending, die bending and dieless bending, which are generally completed by manual control depending on the positioning of fixtures and dies. Under the pressure of the upper or lower die of the bending machine, the metal pipe first undergoes elastic deformation and then enters plastic deformation. In the initial stage of plastic bending, the metal pipe is free to bend. With the application of the upper or lower die to the sheet Pressing, the metal pipe fittings and the inner surface of the V-groove of the lower mold gradually get closer, and at the same time the radius of curvature and the bending arm also gradually become smaller, continue to pressurize until the stroke ends, so that the upper and lower molds are in full contact with...

AI Technical Summary

Problems solved by technology

[0003] For thin-walled metal pipes, buckling and wrinkling are prone to occur during bending and forming, and weaken the wall thickness of local bends, resulting in low production efficiency and low yield, resulting in low quality and efficiency, which restricts the use of bends

Images