Stamping

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

Process for producing resonant tag

Abstract: A process for producing a resonant tag, wherein a metal foil having a thermal adhesion adhesive applied to at least one face thereof is stamped out into a circuit-like shape and is adhered to a base sheet, the process comprising: stamping out the metal foil into a predetermined shaped metal foil portion ( 4 c ) while being passed through a die roll ( 1 ) having thereon a stamping blade with a predetermined shape and a transfer roll ( 2 ) in contact with the die roll ( 1 ) which functions also as a die back-up roll; holding this metal foil portion obtained by the stamping-out operation onto the surface of the transfer roll by suction holes formed in the transfer roll; and thermally adhering the stamped metal foil portion to the base sheet ( 7 ) in contact with the transfer roll ( 2 ) at its another face by an adhesive roll ( 3 ) in contact with the transfer roll through the base sheet. The present invention has such advantages as no damage to the base sheet since the stamping-out operation for the metal foil and the thermal adhesion operation thereof to the base sheet are carried out in separate positions, and no requirement of carrier sheet because the resultant metal foil portion obtained by the stamping-out operation is sucked and held onto the surface of the transfer roll.

Energy absorption of longitudinally grooved square tubes under axial compression

Abstract: This paper investigates the energy absorption characteristics of longitudinally grooved square tubes under axial compression by using explicit nonlinear finite element code LS-DYNA. The grooves are fabricated by stamping and the distributions of the effective plastic strain and the thickness variation from the stamping process are considered in the following crash analyses. From the simulation results, we find that when grooves are introduced on the sidewalls, the specific energy absorption of conventional tubes can be increased by up to 82.7% and the peak force can be reduced by up to 22.3%. The influences of several parameters, including the width of the tube, the length of the groove and the number of the grooves, are analyzed and the features of the deformation modes of grooved tubes are described. The introduction of groove is found to be an effective way to improve the crashworthiness of thin-walled structures.

An experimental study of in-plane large shear deformation of woven fabric composite

Abstract: Textile composites used as structural components have attracted more and more attention due to their superior properties and efficient stamping operations. However, formability of textile composite sheets, restricted by failure mechanisms such as wrinkling, remains as a crucial and challenging issue. Although in stamping of real parts, wrinkling depends on many factors, this paper mainly focuses on the in-plane characterization of pure shear deformation and its contribution to wrinkling. A comprehensive experimental study on woven fabric composites is presented. Modified picture frame tests were conducted up to wrinkling. The effect of test conditions was investigated, and the reduction of yarn width was found to be a key for wrinkling. The onset of wrinkling was determined by a densification method and by a laser scanning technique. Moreover, the cross-sectional profiles of fabric samples during the test were traced, helping to build up a theoretical model of the composite sheets during their large shear deformation.