An easy-to-remove curved anti-wrinkle mandrel

Abstract

The invention discloses an easy-to-detach wrinkle-proof mandrel for bent pipes, which comprises a limit core wire, a plurality of mandrel elements and limit balls. The mandrel element is respectively provided with a plurality of winding holes, and the plurality of winding holes are distributed in a circular direction, and the corresponding winding holes of the plurality of mandrel elements form a core-pulling channel; the plurality of winding holes in each mandrel element are in groups of two, The core-pulling wires correspond to the perforation groups one by one. One end of each core-pulling wire is bound to one end of the first perforation hole in the perforation grouping, and the other end passes through the first perforation hole, then bypasses the mandrel element and then reverses. Pass through the second winding hole corresponding to the grouping of winding holes, and then the other end of the core-pulling wire passes through the core-pulling passage part formed by the surrounding piercing holes corresponding to the positions of other mandrel elements in turn. The core-pulling wires are combined into a bundle to form a core-pulling wire bundle. The invention realizes the function of protecting the tube wall during the core pulling process of the flexible mandrel.

Description

technical field [0001] The invention relates to the field of bent pipe anti-wrinkle mandrels, in particular to an easy-to-detachable bent pipe anti-wrinkle mandrel. Background technique [0002] With the continuous progress and development of social science and technology, pipe bending technology is more used in equipment such as ships, aero-engines and nuclear reactors, and the requirements for the forming and performance of pipe fittings are also more stringent. The bending radius is getting smaller and the wall thickness of the pipe is getting thinner, which makes it more prone to forming defects. The anti-wrinkle mold is an effective means to reduce the bending defects of the pipe fittings. However, due to the radial deformation of the pipe fittings after the pipe is bent, the pipe fittings are easily worn when the anti-wrinkle mold is taken out, resulting in a decrease in the forming quality. When bending pipe fittings, a bent pipe anti-wrinkle mandrel that is easy to ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an easy-to-disassemble bent pipe anti-wrinkle mandrel to solve the problems of difficult core pulling and easy wear of the pipe wall in the prior art flexible mandrel

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