A NON DESTRUCTIVE TESTING METHOD TO PREDICT/ASSESS TORSION VALUE IN TYRE BEAD WIRES BY ELECTROMAGNETIC SORTING TECHNIQUE

摘要

The present invention relates to a non destructive testing method to predict / assess torsion value in tyre bead wires by electromagnetic sorting technique and comprises of collecting a plurality of different coils of tyre bead wires and making a plurality of specimens from each coil, the said specimen being of a predetermined length. Then samples of tyre bead wires with known torsion values are collected. The instrument is then balanced and one known specimen is then replaced by the unknown specimen. When the shifting of the point from balancing is marked. The torsion testing is then carried out for all the specimen of coil no. 1 and the procedure is repeated for the remaining coils including the initial calibration. The shift in point for different specimen with varying torsion values are marked and a plurality of graphs with different pattern for the different coils are plotted with change in impedance in terms of point representation wherein wires of high torsion value is segregated from wires of low torsion value.