A method for three-dimensional free bending of thin-walled tubes

A thin-walled tube, free technology, used in the field of tube bending and forming, can solve problems such as wrinkling, reduce distortion, reduce production costs, and improve forming quality.

Active Publication Date: 2019-11-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

[0003] Aiming at the wrinkling problem that is easy to occur in the process of three-dimensional free bending of thin-walled pipes, the present invention proposes a method for three-dimensional free bending of thin-walled pipes

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  • A method for three-dimensional free bending of thin-walled tubes
  • A method for three-dimensional free bending of thin-walled tubes
  • A method for three-dimensional free bending of thin-walled tubes

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with specific embodiments.

[0019] What this embodiment uses is that diameter is 15mm, the pipe material of wall thickness 2mm, as image 3 shown. This curved pipe has two curved sections and three straight sections: the length of the first straight section a is 400mm; the length of the second straight section c is 40mm; the length of the third straight section e is 65mm; the length of the first curved section b The bending radius is 120mm, the bending angle is 120°, and the bending direction is 0°; the bending radius of the second bending section d is 130mm, the bending angle is 120°, and the bending direction is 40°.

[0020] The multi-roller friction axial feeding and section distortion online correction bending die used in this embodiment is four-roller, specifically including four rolls. The movements of the four rollers are independent, and their friction coefficients and lubrication conditi...

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Abstract

The invention discloses a multi-roller friction axial material supplementation and cross section distortion online rectification bending die and method. The bending die comprises a plurality of rollers, wherein the rollers constitute the intrados of the bending die; the intrados is in contact with a tubular product; each of the rollers can rotate actively with the rotating speed controlled to drive the tubular product to roll in the axial direction and rub so as to supplement the material; during the free bending forming process, the cross section of the tubular wall is likely to have distortion under the extrusion of the inner side and outer side of a bending section; pulling stress can be obtained through enlarging the rotating speed of the rollers on the left and right sides of the bending section; and under the action of the pulling stress, the distortion generated when the thin-walled tubular product freely bends can be rectified on line, so that the defect that the thickness of the tubular wall of a formed piece is not uniform is effectively prevented; and in addition, under the extrusion of the rollers, the wrinkling defect on the inner side of the bending section of the thin-walled tube is overcome.

Description

technical field [0001] The invention relates to a method for three-dimensional free bending of a thin-walled pipe, which belongs to the technical field of pipe bending and forming. Background technique [0002] During the three-dimensional free bending forming process of the pipe, the tube blank is fed axially by the propulsion mechanism. During the bending process of the pipe, due to the axial thrust applied, the external thinning of the bending section is effectively suppressed. However, during the free bending process of thin-walled tubes, the axial thrust can easily cause wrinkling in the inner deformation zone. Therefore, in the free bending forming process of thin-walled tubes, the wrinkling of thin-walled tubes is the first problem to be solved. Contents of the invention [0003] Aiming at the problem of wrinkling that is easy to occur during the three-dimensional free bending forming process of thin-walled pipes, the invention proposes a method for three-dimension...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D7/08B21D7/16B21D37/10
CPCB21D7/08B21D7/16B21D37/10
Inventor 郭训忠占小红李恒封小松魏文斌马子奇潘蕾
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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