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Method for determining tube numerical control bending spring back angle

A bending springback, pipe technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of elastic deformation components can not be fully recovered, errors and so on

Active Publication Date: 2016-09-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the material undergoes elastoplastic bending, the deformation is distributed nonlinearly along the thickness direction, and the elastic deformation components cannot be fully recovered during springback, and residual deformation, residual stress and residual bending moment all exist, and the loading moment during bending is not equal to that during unloading. The springback bending moment, at this time, there is a large error in calculating the springback by using the classical pure bending theory

Method used

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  • Method for determining tube numerical control bending spring back angle
  • Method for determining tube numerical control bending spring back angle
  • Method for determining tube numerical control bending spring back angle

Examples

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Embodiment 1

[0073] This embodiment is a method for calculating the springback angle of pipes in numerically controlled bending. In this embodiment, the curved pipe is made of TA18 titanium alloy, the outer diameter D is 6mm, and the initial wall thickness is t 0 is 0.6mm, the bending radius ρ is 18mm, the bending angle θ before springback is 90゜, and the initial elastic modulus E 0 is 97541MPa, the stable value E of elastic modulus with plastic deformation a It is 94215MPa, the coefficient ξ is -97.45, Poisson's ratio ν is 0.3, the strengthening coefficient K is 1038.9, the hardening exponent n is 0.093, and the material constant b is -0.0040.

[0074] The calculation of the bending springback angle is realized through the following steps, and the specific process is:

[0075] Step 1, determine the stress / strain neutral layer offset D e and the strain ε at the yield point s :

[0076] The stress neutral layer refers to the middle layer where the axial stress on the bending section is...

Embodiment 2

[0149] This embodiment is a method for calculating the springback angle of pipes in numerically controlled bending. In this embodiment, the curved pipe is made of TA18 titanium alloy, the outer diameter D is 12mm, and the initial wall thickness t 0 is 0.9mm, the bending radius ρ is 24mm, the bending angle θ before springback is 120゜, and the initial elastic modulus E 0 is 100380MPa, the stable value E of elastic modulus with plastic deformation a It is 94109MPa, the coefficient ξ is -59.08, Poisson's ratio ν is 0.291, the strengthening coefficient K is 1326.5, the hardening exponent n is 0.070, and the material constant b is -0.0006.

[0150] The calculation of the bending springback angle is realized through the following steps, and the specific process is:

[0151] Step 1, determine the stress / strain neutral layer offset D e and the strain ε at the yield point s :

[0152] The stress neutral layer refers to the middle layer where the axial stress on the bending section ...

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Abstract

A method for determining a tube numerical control bending spring back angle is based on a balance condition, and considers elasticity modulus change, wall thickness change, and neutrosphere offset, can improve the accuracy of spring back prediction, and then achieve accurate control of bended tube forming. The method which considers the elasticity modulus change, the wall thickness change, and the neutrosphere offset can improve the accuracy of spring back prediction, has a certain universality, can be applied to preliminary prediction of tube bending spring back, and plays an import guiding role in research about influence of all the parameters on spring back.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a method for determining the springback angle of numerically controlled bending of pipe materials, which is mainly used for numerically controlled bending. Background technique [0002] In recent years, with the development of large aircraft and a new generation of advanced aircraft in my country, it is urgent to improve the pressure bearing capacity of the hydraulic piping system to meet the requirements of aircraft mobility, stability, and safety. Due to the advantages of low density, high specific strength, excellent fatigue and corrosion resistance, and good welding performance, high-strength TA18 titanium tube can meet the requirements of high strength and light weight, and has received more and more attention and application. [0003] However, the high-strength TA18 titanium tube has the characteristics of high strength, small elastic modulus, and high yield-elastic rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 詹梅杨合王燕
Owner NORTHWESTERN POLYTECHNICAL UNIV
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