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Spring-back compensation method working out factor reversely

A springback compensation and factor technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problems of non-convergence of springback compensation iterations and many times of calculation convergence, so as to reduce the number of trials and improve the The effect of compensation efficiency

Active Publication Date: 2015-05-13
HUAQIAO UNIVERSITY
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Problems solved by technology

For large springback and asymmetric parts, there is a problem of non-convergence of springback compensation iterations in the reverse stress method (FDM). Even in the case of symmetrical workpieces and small springback, the calculation convergence times to reach the final required product shape are more

Method used

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  • Spring-back compensation method working out factor reversely
  • Spring-back compensation method working out factor reversely
  • Spring-back compensation method working out factor reversely

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Embodiment Construction

[0030] In the geometric correction method of springback compensation, the product parts are discretized into a finite number of unit grids, assuming that the product forming die surface after compensation is C, which is a unit set composed of n nodes, and the product surface after springback is S, which is:

[0031] C={c i |c i ∈C 3} 1≤i≤n (1)

[0032] S={s i |s i ∈ S 3} 1≤i≤n (2) Design product part R, expressed as:

[0033] R={r i | r i ∈ R 3} 1≤i≤n (3) The geometric correction of springback compensation is performed on the product part R, and the correction process can be expressed as:

[0034] C=R-α(S-R) (4)

[0035] where α is the compensation factor;

[0036] Due to the inaccurate pre-determined value of α and the nonlinearity in the forming process, the springback part of the stamped product after compensation often deviates from the designed product shape. To avoid the problem of unknown α value, the compensation geometry correction of the die surface is u...

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Abstract

The invention provides a spring-back compensation method working out factor reversely. A test die stamping part is regarded as an imaginary product part and subjected to forming and spring-back simulation, and a simulated spring-back value is worked out; through a forcing-deformation simulation method, the difference value between a test die surface and a test die is calculated and used as an actual compensation value, and a compensation factor is worked out; the compensation factor is applied to die surface compensation of an actual designed part. When the spring-back compensation method is applied to forming of a two-dimensional bent part, spring-back can be well controlled only through once compensation, the compensation efficiency is greatly improved, the die testing frequency is reduced, and reference and basis are provided for spring-back compensation of the two-dimensional bent part.

Description

technical field [0001] The invention relates to a springback compensation method adopting reverse calculation factor. Background technique [0002] Springback is a common problem in stamping forming, especially in the process of bending and shallow drawing. It directly affects the shape and dimensional accuracy of stamping parts, and will bring difficulties to the subsequent assembly process. In recent years, the use of high-strength steel in automobiles has increased year by year, and the strength level has also continued to increase, making the forming accuracy problems caused by springback more and more prominent. [0003] Stamping forming simulation technology has been widely used in the automobile industry, but since the stamping forming research involves many disciplines such as mechanics, materials science, manufacturing technology and numerical calculation methods, the parameters affecting the numerical simulation technology are extremely complex, and the springback ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 江开勇辛秀敏刘华林俊义刘斌
Owner HUAQIAO UNIVERSITY
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