This paper presents a numerical method for simultaneous optimization of blank shape and forming tool geometry in three-dimensional sheet metal operations. The proposed iterative procedure enables the manufacturing products with fitting within specific tolerances (surface edge deviations less than 0.5 or 1.0 mm, respectively) that prescribe maximum allowable deviation between simulated desired g...

In this work, cold bulge forming of an Aluminium-Magnesium (Al-Mg) sheet with a solid bulging medium is performed experimentally and numerically.  Mechanical properties and thickness variations of Al-Mg sheet are evaluated before and after the forming process.  The results indicated that the Al-Mg sheet has taken the desired shape without necking using the cold bulge forming process.  Also, the...

We give a method to obtain a 3D CSG model from a 2D engineering wireframe sketch which depicts a polyhedral shape. The method finds a CSG feature tree compatible with a reverse design history of a 2D line-drawing obtained by vectorising the sketch. The process used seeks the CSG feature tree recursively, combining all design or manufacturing features embedded in the sketch, proceeding in revers...

Windows CE 3.0, also known as Pocket PC for palm-sized devices, is becoming increasingly popular among professionals and corporate enterprises. It is estimated that by 2004 Windows CE will have a share of 40% of the marketplace for palm-sized devices. The documented vulnerabilities against a major competitor of WinCE, Palm, and the proliferation of palm-sized devices highlight the need for secu...

Digital libraries have great potential to improve the educational experience. There are a wide variety of such repositories, especially those that focus specifically on education. However, a survey of existing work shows relatively few that have both a narrow subject focus and ample affordances for content browsing. We present our prototype design and implementation for the HumanCentered Comput...

A nickel-hydride thin film was studied by the Attenuated Total Reflection (ATR) method. The differences between a “black” film and a pure nickel film “blank” behaviour are showed. The black Ni-hydride film has been obtained by a short electrolysis with 1 M Li2SO4 electrolyte in light water. A shift in the minimum of the observed reflected light occurs, together with a change in the minimum shap...