Prodn. method for flat metal ornamental object - involves pre-formed workpiece positioned between two soft material discs and sandwich-type union formed under pressure with workpiece subsequently removed

摘要

The workpiece (1) is formed of precious metal or a precious metal alloy and the sandwich discs used are roundels of lead, tin, rubber or plastics. Before formation, between the contact surfaces of the metal roundels intermediary material is inserted which influences the sepn. and/or surface formation. The intermediary material is sheet- or powder-form, and by material displacement in the inner area of the disc star-shaped, material-free holes are produced. USE/ADVANTAGE - To produce an ornamental piece of jewellery of precious metal with a star-shaped centre formation.