Optimization of sheet metal forming processes by the use of numerical simulations

2002 ◽  
Vol 130-131 ◽  
pp. 54-59 ◽  
Author(s):  
Gašper Gantar ◽  
Tomaž Pepelnjak ◽  
Karl Kuzman
Keyword(s):  
Numerical Simulations ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming

The Effect of Anisotropy on Spring-Back of CK67 Steel Sheet in L-Dies Bending Processes

2011 ◽  
Vol 291-294 ◽  
pp. 672-675
Author(s):  
Jafar Bazrafshan ◽  
A. Gorji ◽  
A. Taghizadeh Armaky
Keyword(s):  
Numerical Simulations ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Steel Sheet ◽  
Elastic Recovery ◽  
Sheet Thickness ◽  
Bend Angle ◽  
Spring Back ◽  
Geometric Changes

One of the most sensitive features of sheet metal forming processes is the elastic recovery during unloading, called spring-back, which leads to some geometric changes in the product. This phenomenon will affect bend angle and bend curvature, and can be influenced by various factors. In this research, the effects of sheet thickness and die radiuses an sheet anisotropy on spring-back in L-die bending of CK67 steel sheet were studied by experiments and numerical simulations.

Developments in Finite Element Technology and Optimization Formulations for Sheet Metal Forming

2012 ◽  
pp. 287-318 ◽  
Author(s):  
Robertt A. F. Valente ◽  
Ricardo J. Alves de Sousa ◽  
António Andrade-Campos ◽  
Raquel de-Carvalho ◽  
Marisa P. Henriques ◽  
...  
Keyword(s):  
Finite Element ◽  
Numerical Simulations ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Single Point ◽  
Experimental Result ◽  
Comprehensive Overview ◽  
Plastic Forming ◽  
Main Ideas

This contribution aims to provide a comprehensive overview of some research developments in the field of computational mechanics and numerical simulations applied to metal forming processes. More specifically, this chapter’s goal is to encompass three main fields of research applied to plastic forming processes: (i) the development of alternative finite element formulations for the simulation of sheet metal forming processes; (ii) the development and discussion of distinct optimization procedures and formulations suitable for the characterization of constitutive parameters to be used in numerical simulations, relying on experimental result data; (iii) the study of non-conventional forming processes, particularly the case of single-point incremental forming operations. For each of these topics, a summary of the formulations and main ideas is provided, as well as a list of references for the interested reader. The main goal of this chapter is, therefore, to provide a comprehensive source of information for researchers from both academia and industrial worlds, about some recent achievements and future trends in the numerical simulation field.

Numerical simulations of sheet-metal forming

1995 ◽  
Vol 50 (1-4) ◽  
pp. 168-179 ◽  
Author(s):  
L. Taylor ◽  
J. Cao ◽  
A.P. Karafillis ◽  
M.C. Boyce
Keyword(s):  
Numerical Simulations ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming

Determination of FLD for Ti-6Al-4V Titanium Alloy Sheet

2016 ◽  
Vol 687 ◽  
pp. 171-178
Author(s):  
Piotr Lacki
Keyword(s):  
Titanium Alloy ◽  
Numerical Simulations ◽  
Real Time ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Forming Limit Diagram ◽  
Alloy Sheet ◽  
Forming Limit

Ti-6Al-4V is the most widely applied titanium alloy in technology and medicine due its good mechanical properties combined with low density and good corrosion resistance. However, poor technological and tribological properties make it very difficult to process, including the problems with sheet-metal forming. The best way to evaluate sheet drawability is to use Forming Limit Diagram (FLD), which represents a line at which failure occurs. FLD allows for determination of critical forming areas.The FLDs can be determined both theoretically and experimentally. Recently, special optical strain measurement systems have been used to determine FLDs.In this study, material deformation was measured with the Aramis system that allows for real-time observation of displacements of the stochastic points applied to the surface using a colour spray. The FLD was determined for Ti-6Al-4V titanium alloy sheet with thickness of 0.8 mm. In order to obtain a complete FLD, a set of 6 samples with different geometries underwent plastic deformation in stretch forming i.e. in the Erichsen cupping test until the appearance of fracture.The real-time results obtained from the ARAMIS software for multiple measurement positions from the test specimen surface were compared with numerical simulations of the cupping tests. The numerical simulations were performed using the PamStamp 2G v2012 software dedicated for analysis of sheet-metal forming processes. PamStamp 2G is based on the Finite Element method (FEM). The major and minor strains were analysed. The effect of friction conditions on strain distribution was also taken into consideration

A Complex Measuring and Evaluation System for Determination of Forming Limit Diagrams

2008 ◽  
Vol 589 ◽  
pp. 233-238 ◽  
Author(s):  
Péter Kovács ◽  
Miklós Tisza
Keyword(s):  
Numerical Simulations ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Evaluation System ◽  
Measuring System ◽  
Forming Limit ◽  
Forming Limit Curves ◽  
Complex Measuring

Forming limit curves are very important for the prediction of failure during sheet metal forming both in practical forming operations and particularly in numerical simulations. The reliability of numerical simulations in sheet metal forming processes is strongly influenced by the reliability of forming limit curves. Therefore, both the theoretical aspects and the experimental determination of the forming limit curves are challenging problems for scientific researchers and industrial practitioners as well. There are various experimental techniques and mathematical models used to determine the forming limit curves. In spite of the standardization efforts made recently by several institutions world wide, there are still significant differences in determining the forming limit curves. Recently, a new, complex measuring system capable for the automatic determination of FLCs was installed at the Department of Manufacturing Engineering. In this paper, first a short overview will be given on the theoretical background of FLCs, then the application of the complex measuring system will be shown.

Advanced design of tooling for sheet-metal forming through numerical simulations in the scope of SRF crab cavities at CERN

2019 ◽  
Author(s):  
A. Amorim Carvalho ◽  
S. Barrière ◽  
J. Brachet ◽  
B. Bulat ◽  
R. Calaga ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming
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