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Method for determining numerical control bending springback angle of homogenous tubular product

A technology of bending springback and pipe materials, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of not considering the change of shrinkage strain ratio, the error between the calculation value of springback angle and the test value, etc., and achieve an increase in average Prediction accuracy, springback prediction accuracy improvement, effect of improving springback prediction accuracy

Inactive Publication Date: 2017-08-04
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 homogenous tubular product
  • Method for determining numerical control bending springback angle of homogenous tubular product
  • Method for determining numerical control bending springback angle of homogenous tubular product

Examples

Experimental program
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Embodiment 1

[0062] 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 .

[0063] The calculation of the bending springback angle is realized through the following steps, and the specific process is:

[0064] Step 1, det...

Embodiment 2

[0127] 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.

[0128] The calculation of the bending springback angle is realized through the following steps, and the specific process is:

[0129] Step 1, determine the stress / strain neutral layer offset D e and the str...

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Abstract

Provided is a method for determining a numerical control bending springback angle of a homogenous tubular product. A method for determining bending springback of a homogenous tubular product by considering elasticity modulus change and contraction strain ratio change is provided based on Hill'48 anisotropic yield criteria and static balance conditions so as to improve the springback prediction precision, and accordingly accurate control of bent pipe forming is achieved. The method for determining the bending springback of the homogenous tubular product considers the elasticity modulus change and contraction strain ratio change in the tubular product bending process is high in calculation speed, has certain universality, can be used for preliminary prediction of bending springback of the homogenous tubular product and has the important research guiding effect on the influence of parameters on 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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IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 詹梅王燕高鹏飞李恒郭良刚
Owner NORTHWESTERN POLYTECHNICAL UNIV