Showing papers on "Hydroforming published in 1990"
33 citations
TL;DR: In this article, a 32-sided polyhedron is described and analyzed, and the stress and strain distribution on the experimental shell are measured and analyzed by the "hastening-sphere" mechanism.
10 citations
TL;DR: In this article, a new kinematically admissible velocity field is suggested for the upper bound solution of hydroforming of longitudinally curved boxes with regular polygonal cross-section.
9 citations
01 Jan 1990
5 citations
01 Jun 1990
TL;DR: In this article, the advantages of the present solution from the technical and financial points of view are discussed from both a technical and a financial point of view, together with the characteristics of the final product.
Abstract: Superconducting accelerating structures made of niobium coated copper cavities are now being built in various laboratories. The standard manufacturing technique for the copper shells associates spinning and welding. But a parallel method, hydroforming of monolithic parts which leads to a better surface quality, has also been investigated at CERN. Parts have previously been produced in the l-2 GHz range, but this technique has now been extrapolated up to the 300 MHz range. Manufacturing procedures, in particular optimisation of the forming and heat treatment sequence, is presented together with the characteristics of the final product. The advantages of the present solution are discussed from the technical and financial points of view.
5 citations
25 Nov 1990
4 citations
Patent•
13 Jun 1990
TL;DR: In this article, a method for the production of tubular components in which, starting from a metal sheet, a tube is formed and the two ends are welded together and the tube obtained subjected to an expansion process is presented.
Abstract: The invention relates to a method for the production of tubular components in which, starting from a metal sheet, a tube is formed and the two ends are welded together and the tube obtained subjected to an expansion process. The object on which the invention is based is to provide a method for the production of tubular components by means of which high-quality tubular components, for baking tubes for example, can be produced economically and in an operationally reliable manner. The invention consists essentially in that, before the expansion process, the tube is mechanically pre-expanded and in that both ends of the pre-expanded tube are sealed, after which it is subjected to a hydroforming expansion process. The advantages obtained consist above all in that, when the method is employed, there is a considerable saving in materials for the body to be produced and that there is virtually no waste produced in the course of the production process. In addition, tooling costs for conversion to different types of tubular components are low. There is also no problem in using sheets of very different quality, e.g. normal deep-drawing steel and austenitic and ferritic stainless steel. Different thicknesses of sheet can also be processed without problems.
3 citations