Stamping

About: Stamping is a research topic. Over the lifetime, 22501 publications have been published within this topic receiving 83554 citations.

Experimental and finite element analysis of spring back in sheet metal forming

Abstract: This paper presents an experimental and numerical study of 2D draw bend spring back phenomenon occurring during the forming operations of steel blank strips. The prediction of this phenomenon is important to evaluate the design of tools used mainly for stamping. In order to truthfully validate materials parameters, both experimental and Finite Elements (FE) analyses were cross compared. This investigation gave a very truthful validation of the FE model, proving its capability to predict spring back values and sidewall curl in 2D draw bending. The experimental device gives better reliable results about spring back criterion for approaching to the real industrial forming conditions. This model is a simple and an efficient way to take apart the responsibilities between the steel maker (steel selection) and the sheet stamping designer (selection of the forming conditions) in the metal stamping process. [Received 24 April 2006, Accepted in revised form 19 January 2007]

Stamping Plant 4.0 – Basics for the Application of Data Mining Methods in Manufacturing Car Body Parts

Abstract: Data-driven quality evaluation in the stamping process of car body parts is quite promising because dependencies in the process have not yet been sufficiently researched. However, the application of data mining methods for the process in stamping plants would require a large number of sample data sets. Today, acquiring these data represents a major challenge, because the necessary data are inadequately measured, recorded or stored. Thus, the preconditions for the sample data acquisition must first be created before being able to investigate any correlations. In addition, the process conditions change over time due to wear mechanisms. Therefore, the results do not remain valid and a constant data acquisition is required. In this publication, the current situation in stamping plants regarding the process robustness will be first discussed and the need for data-driven methods will be shown. Subsequently, the state of technology regarding the possibility of collecting the sample data sets for quality analysis in producing car body parts will be researched. At the end of this work, an overview will be provided concerning how this data collection was implemented at BMW as well as what kind of potential can be expected.

Experimental and numerical investigations of a new U-shaped thin plate energy absorber subjected to bending and friction

Abstract: To explore diversified energy absorption methods, a new energy absorption structure was proposed based on the plastic forming mechanisms of stamping in this paper. Through three repeated quasi-static tests, this new energy absorption structure was proven to be feasible. Moreover, the effects of thickness, friction coefficients and the fillet radius of the plates on the energy absorption of this structure were studied using a verified numerical simulation model. The results show that the structure has good test reproducibility and the deformation mode of the U-shaped plates is both stable and reliable. Stamping forces rise to an initial peak value with increasing stroke and then rapidly decrease to a steady-state force and consequently stabilize. The efficiencies of stamping forces in the three tests were greater than 80%. With increasing plate thickness and friction coefficient, the total energy absorption increased, whilst plastic energy was rarely affected by friction coefficient. The initial peak value of stamping force was sensitive to fillet radius changes of the U-shaped plates; when the fillet radius was larger than 8 mm, stamping forces show an unobvious initial peak value. Steady-state force and energy distribution percentages were little impacted by the fillet radius of the plates. Furthermore, the steady-state force stabilized at around 100 kN and the energy dissipation proportions of the plastic and friction energies were basically in equilibrium.