A double irregular pre-deformation device and method for precision bending

Abstract

The invention discloses a double irregular pre-deformation device and method for precision pipe bending. The double irregular pre-deformation device is characterized in that two groups of pre-deformation assemblies are correspondingly arranged on two sides of the position, with the demand for bending deformation, of a pipe; and in each group of pre-deformation assemblies, a movable fork frame is of a U-shaped structure, an output rod of a hydraulic cylinder is connected with the outer side of the middle of the U-shaped structure of the movable fork frame, a deformation press wheel is coaxiallyfixed outside a rotating shaft, two ends of the rotating shaft are hinged to branches at two ends of the U-shaped structure of the movable fork frame through tapered roller bearings, the deformationpress wheel is in contact with the surface of the pipe, and the deformation press wheel on the movable fork frame is driven by the hydraulic cylinder to apply pre-deformation pressure to the surface of the pipe. The double irregular pre-deformation device and method disclosed by the invention are applicable to the reduction of irregular cross section distortion during the precision pipe bending process; aiming at the different degrees of cross section distortion, the double irregular pre-deformation device and method are very high in adjustability; and the possibility that the pipe wall wrinkles and cracks during the pipe bending process of a pipe bender can be reduced to a great extent.

Description

technical field [0001] The invention relates to a device and method for pre-deformation of pipe fittings, in particular to a double irregular pre-deformation device and method for precision pipe bending, which is used to reduce the problem of irregular distortion of the section of pipe fittings in the process of precision pipe bending, and belongs to cold processing of materials technology field. Background technique [0002] With the rapid development of my country's manufacturing industry, the demand for bent pipes of various materials is also increasing rapidly. Due to the increasingly complex application scenarios, the shape requirements of metal pipes are also complicated. However, the current pipe bending technology cannot meet the corresponding precision standards under the requirements of precision pipe bending. Moreover, when the pipe is bent, the outer material of the bending part is stretched under the tangential tensile stress, and the inner material is subjecte...

AI Technical Summary

Problems solved by technology

The deformation of the bending part is affected by the bending radius and relative thickness of the pipe. The smaller the bending radius and relative thickness, the greater the probability of section distortion in the bending part. The degree of radial deformation of different sections is different, which greatly affects the quality and performance of pipe fittings

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