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Minor radius bend forming method of ultrathin tubular product

A technology of bending forming and small radius, which is applied in the field of material plastic processing, can solve the problems of increasing the normal compressive stress of the pipe wall, increasing the friction force between the pipe and the mold, and difficult implementation, so as to improve the bending forming limit and suppress the reduction of wall thickness Thin, improve the effect of destabilization and wrinkling

Active Publication Date: 2014-05-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using a liquid medium to provide internal pressure requires special equipment, which is difficult to implement, requires a large investment in equipment, and the forming mold is complicated and liquid sealing is difficult.
The size of the formed fillet mainly depends on the internal pressure, and it is difficult to achieve precise quantitative control
In addition, the increase of internal pressure increases the normal compressive stress of the pipe wall, which will increase the friction between the pipe and the mold

Method used

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  • Minor radius bend forming method of ultrathin tubular product
  • Minor radius bend forming method of ultrathin tubular product
  • Minor radius bend forming method of ultrathin tubular product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for bending and forming an ultra-thin pipe with a small radius, comprising the steps of:

[0031] 1). The diameter of the pipe 2 is 60mm, the thickness is 0.73mm (that is, the ratio of diameter to thickness is 82), and the length is 400mm. The material of the pipe 2 is pipe 201; the steel wire 1 is a round steel wire, and the diameter of the steel wire is 1.5mm. The specific wrapping layer is 1.5mm thick, the bending radius is 90mm, the length of the part C to be bent is 200mm, the outer diameter of the mandrel (multi-ball mandrel) 3 is 57.8mm, and the diameter of the ball contained is 57.4mm. The arrangement form is that the three balls are connected in series on the mandrel through the hinge; figure 1 shown;

[0032] The steel wire 1 is used to tightly wrap the part C to be bent of the pipe 2, and the gap between the wrapped steel wire and the pipe is about 0.1mm (the outer diameter difference between the wrapped steel wire and the pipe is about 0.1mm);

...

Embodiment 2

[0039] A method for bending and forming an ultra-thin pipe with a small radius, comprising the steps of:

[0040] 1). The diameter of the pipe 2 is 60mm, the thickness is 0.73mm (that is, the ratio of diameter to thickness is 82), the length is 400mm, and the material of the pipe 2 is 201; the steel wire 1 is square steel wire, and the square steel wire is equilateral 1.5× 1.5mm, the specific wrapping layer is 1.5mm thick, the bending radius is 90mm, the length of the part to be bent is 200mm, the outer diameter of the mandrel (multi-ball mandrel) 3 is 57.8mm, and the diameter of the ball contained is 57.4mm , the arrangement of the balls is that three balls are connected in series on the mandrel through a hinge; figure 1 shown;

[0041] The steel wire 1 is used to tightly wrap the part C to be bent of the pipe 2, and the gap between the wrapped steel wire and the pipe is about 0.1mm (the outer diameter difference between the wrapped steel wire and the pipe is about 0.1mm); ...

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Abstract

The invention relates to a plastic processing forming method of metal material, in particular to a minor radius bend forming method of an ultrathin tubular product. The minor radius bend forming method of the ultrathin tubular product is characterized by including following steps: 1) using a steel wire to tightly twine and wrap a portion of a tubular product, to be bent; 2) placing a core rod inside the tubular product after being wrapped with the steel wire, and then using a normal numerical control bending device to perform numerical control bend forming on the tubular product after being wrapped with the steel wire; 3) using a winding machine to dismantle the steel wire which wraps the tubular product after the bend forming finishes so as to obtain the ultrathin tubular product which is minor in bend radius. The minor radius bend forming method of the ultrathin tubular product introduces an additional pulling stress to the tubular product by wrapping the tubular product when the bend forming is performed on the tubular product, enables the center layer of the tubular product to move towards the outer side of the tubular product, and accordingly reduces the pulling stress on the outer side of the tubular product so as to reduce reduction amount of the wall thickness of the outer side of the tubular product, and simultaneously effectively reduces unstable corrugation defect rate of the inner layer of the tubular product when the tubular product is bent.

Description

technical field [0001] The invention relates to a metal material plastic processing forming method, in particular to a new method for ultra-thin pipe material bending forming with small radius, and belongs to the technical field of material plastic processing. Background technique [0002] With the development trend of lightweight, high performance and low cost in the field of aerospace and automobile transportation, the requirements for bent pipe fittings are getting higher and higher, and the ratio of diameter to thickness (the ratio of diameter D to wall thickness t) is required to be larger, and the bending Radius (radius R of pipe bending neutral layer 0 The ratio of pipe diameter D) is smaller and the forming accuracy is higher. The use of ultra-thin pipe fittings with a small curvature radius can not only reduce weight and achieve lightweight, but also make the layout of the piping system compact and save costs. However, with the increase of the diameter-thickness r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D9/00B21D9/16
Inventor 胡志力华林严勇吴超
Owner WUHAN UNIV OF TECH
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