Bending device for thin-wall metal pipe

Abstract

A bending device for a thin-wall metal pipe comprises an inner support, an upper die and a lower die. A die cavity formed when the upper die and the lower die are in a die assembly state is matched with the bent metal pipe; the inner support is matched with a pipe cavity of the metal pipe; the inner support comprises a plurality of supporting balls connected to a soft rod in series through through holes, and the diameter of the supporting balls is matched with the inner diameter of the pipe cavity; a plurality of sliding balls with the diameter larger than that of the through holes are arranged on the soft rod at intervals, and the sliding balls are arranged in sliding cavities formed in the supporting balls along the through holes; and the middle point of the soft rod serves as the center point, when the inner support is matched with the bent metal pipe, the supporting balls are sequentially adjacent, and the sliding balls are all arranged at the sides, close to the center point, of the sliding cavities. The inner support plays a role in supporting the metal pipe, preventing deformation and assisting bending; and lubricating liquid is guided into all contact faces, friction force between the contact faces is reduced, and the thin wall of the metal pipe is protected. The metal pipe is limited through fixing rings, so that bending stability is guaranteed, excessive deformation of pipes at the two ends is prevented, the bending precision is improved, and high practicability and wide applicability are achieved.

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

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