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Method for determining numerical control bending springback angle of homogeneous pipe

A bending springback, pipe technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as the error between the springback angle calculated value and the test value, and the change of the shrinkage strain ratio is not considered, so as to improve the prediction Accuracy, improving springback prediction accuracy, and the effect of improving springback prediction accuracy

Inactive Publication Date: 2017-07-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this invention does not consider the change of shrinkage strain ratio, which leads to a certain error between the calculated value of springback angle and the experimental value

Method used

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  • Method for determining numerical control bending springback angle of homogeneous pipe
  • Method for determining numerical control bending springback angle of homogeneous pipe
  • Method for determining numerical control bending springback angle of homogeneous pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] This embodiment is a method for calculating the springback angle of a homogeneous pipe 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 90゜, and the initial elastic modulus E 0 is 100380MPa, the stable value E of elastic modulus with plastic deformation a is 94109MPa, coefficient ξ, a 0 、a 1 , b 1 、a 2 and b 2 They are -59.08, 1.11687, 3.25907, 0.00409, 1.02701 and 0.02799 respectively, Poisson's ratio ν is 0.3, strengthening coefficient K is 1326.47MPa, hardening exponent n is 0.0702, and material constant b is -0.0006. The bending radius ρ is the distance from the bending center 9 to the geometrically neutral layer 1 .

[0064] The calculation of the bending springback angle is realized through the following steps, and the specific process is:

[0065] Step 1, det...

Embodiment 2

[0131] 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, and the bending angle θ before springback is different from the bending angle of 120° in Example 1, and the initial elastic modulus E 0 is 100380MPa, the stable value E of elastic modulus with plastic deformation a is 94109MPa, coefficient ξ, a 0 、a 1 , b 1 、a 2 and b 2 They are -59.08, 1.11687, 3.25907, 0.00409, 1.02701 and 0.02799 respectively, Poisson's ratio ν is 0.3, strengthening coefficient K is 1326.47MPa, hardening exponent n is 0.0702, and material constant b is -0.0006.

[0132] The calculation of the bending springback angle is realized through the following steps, and the specific process is:

[0133] Step 1, determine the stress / strain neutral layer offset D e and the str...

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Abstract

The invention discloses a method for determining a numerical control bending springback angle of a homogeneous pipe. Based on a Hill'48 anisotropic yield criterion and a static balance condition, a method for calculating bending springback of the homogeneous pipe by considering elastic modulus change and shrinkage strain ratio change is proposed, so that the springback prediction precision is improved and accurate control on pipe bending forming is realized. The method for calculating the bending springback of the homogeneous pipe by considering the elastic modulus change and the shrinkage strain ratio change in a pipe bending process is high in calculation speed, has a certain universality, can be used for preliminary prediction of the bending springback of the homogeneous pipe, and has an important guide effect for researching the influence of parameters on the springback.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a method for determining the springback angle of homogeneous pipe material numerical control bending, which is mainly used for homogeneous pipe material numerical control bending forming. Background technique [0002] Plastic processing of pipes is a processing technology that uses pipes as blanks to manufacture pipe parts through plastic processing. Because it is easy to meet the requirements for light weight, toughness, precision and low consumption of products, it is widely used in aviation, aerospace and automobile industries. It has been widely used and has become an important direction for the research and development of advanced plastic processing technology in the 21st century. Pipe bending forming is a plastic processing process that bends pipe blanks into a certain bending radius, certain bending angle and shape, and is an important part of pipe plastic processing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 詹梅王燕高鹏飞李恒郭良刚
Owner NORTHWESTERN POLYTECHNICAL UNIV
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