Investigation on changing loading path in sheet metal forming by applying a property-adjustable flexible-die

2020 ◽  
Vol 53 ◽  
pp. 364-375 ◽  
Author(s):  
Peng-yi Wang ◽  
Zhong-jin Wang ◽  
Nan Xiang ◽  
Ze-xin Li
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Loading Path ◽  
Flexible Die

Study on Loading Path Influences on the Thickness Distribution of TRIP Steels During Sheet Metal Forming

2009 ◽  
Author(s):  
W. J. Dan ◽  
W. G. Zhang ◽  
S. H. Li
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Martensite Transformation ◽  
Strain State ◽  
Thickness Distribution ◽  
Loading Path ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Forming Temperature

Loading path is one of key factors that influence the formability of sheet metal forming processes. In this study, the effect of several kinds of loading paths on the thickness distribution of TRIP steel is investigated in a deep drawing process based on a constitutive model accompanying the strain-induced martensite transformation. A kinetic model of transformation, that describes the relationship between the thickness distribution of a deep drawing process and the martensite transformation, is used to calculate the martensite volume fraction. The influences of loading path on the martensite transformation are also evaluated through the change in the stress-strain state, the forming temperature, the transformation driving force, the nucleation site probability and the shear-band intersection controlled by the stress-strain state and forming temperature at the minimum thickness location in the formed part.

scholarly journals Modeling of Cross Work Hardening and Apparent Normality Loss after Biaxial–Shear Loading Path Change

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 142
Author(s):  
Yanfeng Yang ◽  
Cyrille Baudouin ◽  
Tudor Balan
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Work Hardening ◽  
Metal Forming ◽  
Material Model ◽  
Shear Loading ◽  
Loading Path ◽  
Forming Simulation ◽  
Apparent Loss ◽  
Specific Loading

The specific loading-path change during sheet metal forming may lead to some abnormal deformation phenomena. Two-stage orthogonal loading paths without elastic unloading have revealed a phenomenon of apparent loss of normality, further modeled in the literature by non-normality theories. In this paper, a particular orthogonal strain-path change is investigated using the Teodosiu–Hu hardening rule within an associated plasticity framework. The results indicate that cross work-hardening has a significant contribution to the apparent loss of normality and subsequent asymmetric yield surface evolution. Detailed contributions of the model’s ingredients and features are clarified. The developed material model is intended for sheet metal forming simulation applications.

scholarly journals Recent Developments and Trends in Sheet Metal Forming

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 779 ◽  
Author(s):  
Tomasz Trzepieciński
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Numerical Algorithms ◽  
Production Cycle ◽  
Good Surface ◽  
Flexible Die Forming ◽  
Recent Developments ◽  
Home Appliance ◽  
Flexible Die

Sheet metal forming (SMF) is one of the most popular technologies for obtaining finished products in almost every sector of industrial production, especially in the aircraft, automotive, food and home appliance industries. Parallel to the development of new forming techniques, numerical and empirical approaches are being developed to improve existing and develop new methods of sheet metal forming. Many innovative numerical algorithms, experimental methods and theoretical contributions have recently been proposed for SMF by researchers and business research centers. These methods are mainly focused on the improvement of the formability of materials, production of complex-shaped parts with good surface quality, speeding up of the production cycle, reduction in the number of operations and the environmental performance of manufacturing. This study is intended to summarize recent development trends in both the numerical and experimental fields of conventional deep-drawing, spinning, flexible-die forming, electromagnetic forming and computer-controlled forming methods like incremental sheet forming. The review is limited to the considerable changes that have occurred in the SMF sector in the last decade, with special attention given to the 2015–2020 period. The progress observed in the last decade in the area of SMF mainly concerns the development nonconventional methods of forming difficult-to-form lightweight materials for automotive and aircraft applications. In evaluating the ecological convenience of SMF processes, the tribological aspects have also become the subject of great attention.

ИССЛЕДОВАНИЕ ТОЧНОСТИ ДЕТАЛЕЙ, ПОЛУЧАЕМЫХ ПРИ РАЗДЕЛИТЕЛЬНЫХ ОПЕРАЦИЯХ В ПЕРЕНАЛАЖИВАЕМЫХ ШТАМПАХ

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.

Sign in / Sign up

Export Citation Format

Share Document