The stainless steel bipolar plate has received much attention due to the cost of graphite bipolar plates. Since the micro-channel of bipolar plates plays the role of fuel flow field, electric connector and fuel sealing, an investigation of the deep drawing process for stainless steel micro-channel arrays is reported in this work. The updated Lagrangian formulation, degenerated shell finite elem...

* Current address – Department of Industrial Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI 53201 † Corresponding author – [email protected] Tel: +91-80-22932301 Fax: +91-80-23600648 ABSTRACT Surface texture of the die plays an important role on friction during metal forming. In the present study, unidirectional and random surface finishes were produced on hardened stee...

We describe here for the first time the low temperature superplasticity of nanostructured low carbon steel (microalloyed with V, N, Mn, Al, Si, and Ni). Low carbon nanograined/ultrafine-grained (NG/UFG) bulk steel was processed using a combination of cold-rolling and annealing of martensite. The complex microstructure of NG/UFG ferrite and 50-80 nm cementite exhibited high thermal stability at ...

This paper focuses on understanding the influence of laser milling process parameters on the final geometrical and surface quality of micro-channel features fabricated on AISI H13 steel. Optimal selection of process parameters is highly critical for successful material removal and high dimensional and surface quality for micro-sized die/mold applications. A set of designed experiments is carrie...

This paper describes a system which integrates computer vision and rapid manufacturing technologies to scan physical objects and to replicate the reconstructed shapes as steel faced dies using shaping deposition processes. A light-atripe range finder is used to scan t,he 3-D data of the object. Range data is then processed in order to generate a solid model representation. A simulation process ...

OBJECTIVES Marginal adaptation is important for long-term success of full-coverage restorations. The aim of this study was to determine the effect of porcelain firing cycle and different thicknesses of IPS e.max core on marginal accuracy of all-ceramic restorations. MATERIALS AND METHODS A standard stainless steel die with 0.8 mm classic chamfer finish line and 10° taper was used in this in v...

The correct selection of process parameters for manufacturing is one of the most important aspects taken into consideration in the majority of manufacturing processes and particularly, in process related to EDM. The machining characteristics are greatly influenced by the nature of dielectric used during micro-EDM. The present paper investigates the fuzzy logic model for micro-electrical dischar...

Objective. To investigate the accuracy of dies obtained from single-step and 2-step double-mix impressions. Material and Methods. Impressions (n = 10) of a stainless steel die simulating a complete crown preparation were performed using a polyether (Impregum Soft Heavy and Light body) and a vinyl polysiloxane (Perfectim Blue Velvet and Flexi-Velvet) in two consistencies, in one or two (without ...

The Finite-Element-Analysis (FEA) is of major importance for the design and improvement of forging processes. In this field, FEA is traditionally used to predict die fill, residual stresses and forming forces. The intention of the work presented in this paper is the development of an advanced simulation model for the description of phase transformation processes in forging dies based on FEA. Th...

The effects of contact conditions at the wire–die interface on temperature distribution specimen and die are investigated to understand wire drawing process. Finite element analysis experiments performed analyze a drawn based different using low-carbon steel wire. maximum (Tmax) decreases as heat transfer coefficient increases, whereas that increases with coefficient. Tmax thermal conductivity ...