European Community (Ec)

Pier Carlo Tebaldi

Bertrand Causse D'Agraives

Ermanno Mascetti

Jan Toornvliet

The invention concerns a method for making identity cores for ultrasound seals. Each core comprises a chip consisting of a brazed stack of metal disks bearing at least one notch , the resulting identity being defined by the number, the size and the random angular position of the various notches in the stack and by the unpredictability of the brazing. The invention is characterized in that the notched disks provided with a central hole are first stacked in large numbers in a tubular metal sheath with a circular cross-section corresponding to said disks . The stack is then axially compressed in the sheath and a brazing bead is inserted in the channel constituted by the assembly of aligned central holes . After brazing in a vacuum oven, the two ends of the sheath are eliminated and the resulting column is segmented perpendicularly to its axis into a series of individual identity chips of predetermined thickness. Such a chip is finally associated by brazing with a metal block used as delay line to constitute the core. Identity control can be combined with integrity control by associating an integrity rod to with said block , whereby with one reading both identity and integrity can be ascertained.

Growing community of inventors

Brebbia, Italy

Pier Carlo Tebaldi