Device and method for prefabricating local beneficial wrinkles of pipe

Abstract

The invention relates to the technical field of pipe forming, discloses a device and method for prefabricating local beneficial wrinkles of a pipe. The problems of global buckling or serious bending and the like when the local beneficial wrinkles of a thin-wall pipe with a large length-diameter ratio or a bent axis are prefabricated are solved. A first electrode contact and a second electrode contact are used for heating the to-be-wrinkled position of the pipe, and a first mechanical arm and a second mechanical arm are used for directly applying axial force to the two ends of the to-be-wrinkled position of the pipe, so that whether the pipe with the large length-diameter ratio or the pipe with the to-be-wrinkled position located in the bending area, the beneficial wrinkles can be accurately prefabricated at the to-be-wrinkled position of the pipe, serious bending of the bent area of the pipe can be avoided, global buckling of the pipe can be avoided, operation is flexible and variable, the limitation that local beneficial wrinkles can only be prefabricated on a straight short-axis pipe in the prior art is broken through, production efficiency can be improved, and the labor cost is saved.

Description

technical field [0001] The invention relates to the technical field of pipe forming, in particular to a device and method for prefabricating local beneficial wrinkles on pipes. Background technique [0002] With the continuous progress and development of manufacturing technology, high pressure forming technology for pipes, as an advanced lightweight forming technology, has been widely researched and applied. At present, the axis of most internal high pressure forming parts is not a simple straight line, but is bent in a two-dimensional or three-dimensional state, and the length of the pipe is much larger than the diameter of the pipe. It is necessary to bend the pipe first, and then preform and Internal high pressure forming, and finally get the required pipe fittings. For the position where the expansion rate is required to be high, the material needs to be supplemented to the required position through axial compression during the forming process, and for the pipe with a l...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, the local beneficial wrinkles for pipe prefabrication are basically concentrated on the shorter straight pipes, while for the pipes whose axes are in a two-dimensional or three-dimensional state, when the existing technology is used to prefabricate the local beneficial wrinkles of the pipe, it is easy to make the pipe The bending area of ​​the pipe is severely bent, causing global buckling of the pipe, which seriously affects the quality of the pipe. For long pipes, when the existing technology is used to prefabricate the local beneficial wrinkles of the pipe, it will also cause global buckling of the pipe, and it cannot be accurately Precisely form local beneficial wrinkles at the position of desired prefabricated beneficial wrinkles

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