Topic
Stamping
About: Stamping is a research topic. Over the lifetime, 22501 publications have been published within this topic receiving 83554 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the authors investigated the applicability of gap supports and forming without blank holder in hot stamping and found that the forming limit in both cases was improved as compared with that in the conventional blank holding method.
19 citations
29 Aug 2011
TL;DR: In this article, a numerical modeling approach for predicting springback by considering the variations of elastic modulus on springback in stamping AHSS was presented, and experiments were conducted with a simple geometry such as U-shape bending and more complex geometry, such as the curved flanging and S-rail stamping.
Abstract: This paper presents a numerical modeling approach for predicting springback by considering the variations of elastic modulus on springback in stamping AHSS. Various stamping tests and finite‐element method (FEM) simulation codes were used in this study. The cyclic loading‐unloading tensile tests were conducted to determine the variations of elastic modulus for dual‐phase (DP) 780 sheet steel. The biaxial bulge test was used to obtain plastic flow stress data. The non‐linear reduction of elastic modulus for increasing the plastic strain was formulated by using the Yoshida model that was implemented in FEM simulations for springback. To understand the effects of material properties on springback, experiments were conducted with a simple geometry such as U‐shape bending and the more complex geometry such as the curved flanging and S‐rail stamping. Different measurement methods were used to confirm the final part geometry. Two different commercial FEM codes, LS‐DYNA and DEFORM, were used to compare the experiments. The variable elastic modulus improved springback predictions in U‐shape bending and curved flanging tests compared to FEM with the constant elastic modulus. However, in S‐rail stamping tests, both FEM models with the isotropic hardening model showed limitations in predicting the sidewall curl of the S‐rail part after springback. To consider the kinematic hardening and Bauschinger effects that result from material bending‐unbending in S‐rail stamping, the Yoshida model was used for FEM simulation of S‐rail stamping and springback. The FEM predictions showed good improvement in correlating with experiments.
19 citations
TL;DR: In this paper, a large scale pin-on-disk test campaign has been carried out using a large-scale pin-disk device designed and realized by the Authors to investigate the influence of pressure, sliding velocity and temperature.
Abstract: In conventional sheet forming processes, such as stamping or drawing, significant contact phenomena take place between workpiece and die surfaces. Especially, relative motion and normal loads generate friction which influences some aspects of processes such as material flow, tools wear and life and total force needed to complete the process. In the current paper an experimental test campaign has been carried out using a large scale pin-on-disk device designed and realized by the Authors to investigate the influence of pressure, sliding velocity and temperature. The purpose is to test the developed device and to find which and how these parameters mostly affect friction. The pin-on-disk test consists of two specimens, a pin and a plate representing respectively die and workpiece, which are compressed by means of a known force and then moved one over the other. Compression and friction forces are sampled during the tests and the friction coefficient is estimated as the ratio of these two forces. The tested materials are H13 die steel on FeP04 and AZ31 sheets.
19 citations
Patent•
14 May 1999
TL;DR: A rotary hot foil stamping machine is provided in this paper for repeatedly stamping a foil image onto a continuous product web at a consistent interval along the length of the product web, including first and second die stations, each die station comprising a servo driven rotary die holder with at least one removable die attached thereto.
Abstract: A rotary hot foil stamping machine is provided for repeatedly stamping a foil image onto a continuous product web at a consistent interval along the length of the product web. The rotary hot foil stamping machine includes first and second die stations, each die station comprising a servo driven rotary die holder with at least one removable die attached thereto. Counter rolls are mounted adjacent each die holder such that the outer surfaces of the dies engage the counter rolls as the dies are rotated past the counter rolls. The die holders are driven at a constant speed such that said die surfaces engage the counter rolls simultaneously at regular timed intervals.
19 citations
01 Aug 1984
TL;DR: In this paper, a simplified heuristic solution of nesting metal stamping blanks with near optimum layouts is presented, including a complete analysis, including press capacity, coiled or strip stock, cost analysis etc.
Abstract: In a metal stamping operation, the major cost is that of materials; any efforts during the design stage to minimize scrap by selecting interlocking figures or by using careful layouts may result in substantial savings.A number of template layout solutions has been developed but most of the methods require rather lengthy computation time even on a large computer. In addition, the solutions are not particularly geared towards metal stamping operations.This paper presents a simplified heuristic solution of nesting metal stamping blanks with near optimum layouts. A complete analysis, including press capacity, coiled or strip stock, cost analysis etc. is also suggested.
19 citations