Thin-walled metal tube bending and forming method

A metal tube and thin-wall technology, applied in the field of metal plastic forming, can solve the problems of increasing the friction between the outer wall of the tube and the mold cavity, increasing the complexity of the forming process, and the wrinkling effect is not obvious, so as to eliminate buckling and wrinkling phenomenon, improvement of wall thickness uniformity, and low manufacturing cost

Active Publication Date: 2014-07-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it also has many disadvantages: (1), while the internal high pressure reduces the inner compressive stress of the elbow, it also increases the friction between the outer wall of the pipe and the mold cavity, resulting in an actual increase of the inner compressive stress, some even All offset its positive side, so the actual effect of improving wrinkling is not obvious; (2), using internal high pressure as a support, it is necessary to deal with the sealing problem between the pressurized medium and the pipe, which will increase the complexity of the forming process

Method used

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  • Thin-walled metal tube bending and forming method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The first step is to use 1mm thick 6061 aluminum alloy sheet coil welding to form a tube blank 1 with a diameter of 202mm, and the axial length of the blank is about 260mm;

[0026] The second step is to cut the carbon steel pipe 2 with an inner diameter of 202mm, a wall thickness of 3mm, and a plasticity better than 6061 aluminum alloy along the axial direction, and cut it into two symmetrical half pieces, and implement the two half pieces of carbon steel pipe 2. Phosphating and saponification treatment to improve the lubrication conditions of the inner and outer surfaces and reduce friction;

[0027] The third step is to completely cover the 6061 aluminum alloy pipe 1 with the two half pieces of carbon steel, and perform spot welding on both ends of the two half pieces of carbon steel to partially connect the two half pieces of carbon steel;

[0028] The fourth step is to pour a low-melting point alloy inside the 6061 aluminum alloy tube 1, and wait for the low-meltin...

Embodiment 2

[0034] The first step is to blank the titanium alloy seamless pipe 1 with a diameter of 48.5mm and a wall thickness of 1mm, and the axial length of the blank is about 115mm;

[0035] In the second step, the carbon steel pipe 2 with an inner diameter of 48.5 mm, a wall thickness of 2 mm, and a plasticity better than that of titanium alloy is cut in half along the axial direction, and is cut into two symmetrical half pieces, and the two half pieces of the carbon steel pipe are subjected to phosphorus Chemical and saponification treatment, improve the lubrication conditions of internal and external surfaces, and reduce friction;

[0036] In the third step, after the two halves of carbon steel are completely covered with the titanium alloy seamless pipe 1, spot welding is performed on both ends of the two halves of carbon steel to partially connect the two halves of carbon steel;

[0037] The fourth step is to insert cylindrical polyurethane rubber inside the titanium alloy seamle...

Embodiment 3

[0043] The first step is to roll weld the stainless steel with a wall thickness of 1mm to obtain a tube blank 1 with a diameter of 100mm, the axial length of the blank is about 314mm, and seal the tail of the stainless steel tube blank at the same time;

[0044] The second step is to cut the carbon steel pipe 2 with an inner diameter of 100mm, a wall thickness of 5mm, and a plasticity better than stainless steel along the axial direction, and cut it into two symmetrical halves, and then phosphating and curing the two halves of the carbon steel pipe. Saponification treatment to improve the lubrication conditions of the inner and outer surfaces and reduce friction;

[0045] The third step is to completely cover the stainless steel pipe with the two half pieces of carbon steel, and perform spot welding on the end of the carbon steel to partially connect the two half pieces;

[0046] The fourth step is to weld the tail of the carbon steel pipe 2 to seal the bottom, inject filling ...

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Abstract

The invention discloses a thin-walled metal tube bending and forming method and belongs to the technical field of metal plastic forming. The thin-walled metal tube bending and forming method includes: firstly, applying support to the inner surface and the outer surface of a thin-walled metal tube; secondly, subjecting the outer surface to lubricating treatment and three layers to integral bending and forming, and removing supporting materials on the inner and outer layers to finally obtain the thin-walled metal tube. The inner support and the outer support are provided simultaneously through an inner support layer and the outermost-layer metal tube, the situations that buckling and wrinkling are easy to occur during bending and forming of the thin-walled metal tube are removed, and uniformity of wall thickness of the bending tube is improved at the same time.

Description

technical field [0001] The invention relates to a push-bending forming method of a metal pipe, in particular to a push-bending forming method of a thin-walled metal pipe, and belongs to the technical field of metal plastic forming. Background technique [0002] Thin-walled metal pipes generally refer to metal pipes with a diameter-to-thickness ratio greater than 50. At present, because the aviation, aerospace and automobile industries are highly concerned about material weight reduction, there is a very urgent demand for thin-walled pipe fittings. Due to the relatively thin wall thickness of the thin-walled tube, it is very easy to buckle, wrinkle and crack under axial compression during the bending forming process, resulting in plastic instability. Existing processes such as winding, press bending, push bending, and roll bending all adjust the bending forming process by adjusting local deformation, reducing friction coefficient, and applying reverse thrust, etc., which can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D9/12
Inventor 郭训忠陶杰金先玉裴文娇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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