Uniformity correction by ablation at different track locations along a tire bead

摘要

A system and method for reducing the magnitude of one or more harmonics of one or more uniformity parameters in a cured tire involves selective removal of tire material at one or more track/area locations along first and second bead profiles. Selective removal may occur via ablation at the bead seat, low flange and/or high flange zones to correct for a selected number of harmonics of such parameters as radial, lateral and tangential force variation. Ablation patterns are calculated and implemented on first and second tire beads to achieve desired levels of force reduction at selected angular locations (within the expanse from 0-360 degrees along each tire bead). Ablation patterns may be calculated for implementation at fixed or varied tire rotational speeds and/or fixed or varied levels of laser power.

主权项

1. A method for reducing a magnitude of one or more harmonics of one or more uniformity parameters in a cured tire, said method comprising the steps of:
identifying one or more uniformity parameters and a selected number of harmonics for each parameter for which correction is desired; determining a plurality of different track locations for ablation defined along the profile of each tire bead, the plurality of different track locations including two or more of a bead seat, a low flange zone, and a high flange zone, the plurality of different track locations being determined based at least in part on a sensitivity associated with the bead seat, the low flange zone, and the high flange zone; calculating a plurality of ablation patterns for each tire bead to correct for the selected number of harmonics for each identified uniformity parameter, each pattern in the plurality of ablation patterns being designed for ablation at one of the plurality of different track locations defined along the profile of a tire bead in two or more of the bead seat, the low flange zone and the high flange zone; and selectively removing tire material along a first and second tire beads according to the plurality of ablation patterns calculated for each tire bead.