Optimum blank design in sheet metal forming by the deformation path iteration method

A numerical optimization system for sheet metal forming process has been developed based on a combination of response-surface-based optimization strategy with finite element simulation. The most important feature of the optimization system is introduction of a new fracture criterion to predict fracture limit under non-proportional deformation. In addition, a sheet-edge fracture criterion is also introduced to predict fracture limit under stretch-flanging deformation. The numerical optimization system is developed using the fracture criteria as accurate fracture constraints to avoid sheet breakage. The developed optimization system is applied to the optimum blank design for a square-cup deep drawing process of perforated blank. The optimum blank design, which minimizes the amount of material and avoids the sheet fracture, is obtained successfully. The effect of definition of fracture constraints on optimization calculation is also discussed.

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Improvement of the Iterative Algorithm for Numerical Simulation of Springback in Sheet Metal Forming

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.102-104.1 ◽

2010 ◽

Vol 102-104 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Jun Han ◽

Fa Zhong Shi ◽

Li Kang Shao

Keyword(s):

Numerical Simulation ◽

Iterative Algorithm ◽

Sheet Metal ◽

Sheet Metal Forming ◽

Metal Forming ◽

Iteration Method ◽

Potential Problem ◽

Use Of Self ◽

Numerical Examples

Springback is an inevitable process of sheet metal forming phenomenon. Numerical simulation is an effective way to solve the springback problem, and more and more attention to industry and academia. This paper describes the implicit springback analysis of the BFGS equilibrium iteration method, and proposes a strategy for optimizing the calculation, reducing the computation and avoiding the potential problem of instability in the calculation. At last, the use of self-developed software gives numerical examples.

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ИССЛЕДОВАНИЕ ТОЧНОСТИ ДЕТАЛЕЙ, ПОЛУЧАЕМЫХ ПРИ РАЗДЕЛИТЕЛЬНЫХ ОПЕРАЦИЯХ В ПЕРЕНАЛАЖИВАЕМЫХ ШТАМПАХ

Open Information and Computer Integrated Technologies ◽

10.32620/oikit.2018.81.06 ◽

2018 ◽

pp. 52-63

Author(s):

Е. А. Фролов ◽

В. В. Агарков ◽

С. И. Кравченко ◽

С. Г. Ясько

Keyword(s):

Sheet Metal ◽

Sheet Metal Forming ◽

Metal Forming ◽

Balance Method ◽

Experiment Planning ◽

Practical Recommendations

To determine the accuracy of the readjustable punches for separating operations (perforation + punching out) of sheet-metal forming, the accuracy parameters were analyzed using the random balance method using the method of experiment planning. Analytical dependencies are obtained to determine the values of deviation of the outer and inner contour dimensions of perforated and punched out sheet parts. From the dependencies obtained, it is possible to estimate and predict the value of deviation in the dimensions of the resulting part at any time during the operation of the punch. Practical recommendations on the calculation of the actuating dimensions of the working elements (stamping punch, matrix) of readjustable punches are offered.

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