Abstract: The present invention provides an improved method for hydro-mechanical stamping wherein hollow products are formed from flat blanks by the cooperation of a punch and a liquid female tool. The present method particularly provides for submerging in the liquid the blank which is to be stamped, the level of the liquid being also maintained above the usual stamping ring. The invention further provides apparatus which acts to center the blank relative to the stamping ring, the present apparatus comprising an additional ring rigidly connected to the stamping ring and having radial apertures therein which form portions of circuitous liquid paths through which liquid flows on stamping, the paths acting to prevent localized rupture during stamping. The present method and apparatus find particular application to the high-speed manufacture of hollow, thin-walled articles of non-cylindrical shape.

Abstract: A process for producing thermoformed articles from thin-walled blanks composed of aluminum or magnesium alloys, the present invention particularly provides for forming a layer of alumina or magnesia on the surfaces of the respective aluminum or magnesium blank. The alumina or magnesia layers so formed are artificially formed in order to obtain desired thicknesses, the regular layers allowing ready removal of the articles from thermoforming molds. The present process is particularly intended for the production of thin-wall packaging members and motor vehicle components.

Abstract: A hermetic closure cap of resilient thermoplastic material constructed so as to be removably securable in an aperture made in a rigid sheet.This cap is retained by a normally non-deformable but laterally retractable part pressing against the edges of the rigid sheet defining the aperture and which cap is maintained in position before opening by a removable locking element which is inserted into a slot in the cap that is of similar cross-section to that of the locking element.The sealing cap thus designed can be used, for example, in cans containing a beverage under pressure.