Current location: Sigmavision / Products / Green Tyre Runout & Profiling

Green Tyre Runout & Profiling

The problem

Semi automatic tyre building machines suffer inherent variability as they rely on operators to accurately and repeatably position and splice green tyre components during 1st and 2nd stage processes. If there are variations in component thickness, profile and length then these problems are compounded leading to excessive runout and non-uniformity of the green tyre. Data suggests a direct correlation between green tyre errors, such as runout and finished tyre errors.

The solution

Portable systems comprising a tripod mounted laser spot sensor or laser sheet of light sensor may be used to diagnose green tyre errors. Green tyre runout may be measured to high accuracy using a variant of the Finished Tyre Runout system configured for green tyres. A 3D profile of the 1st stage carcass and 2nd stage belts and tread may be obtained using a laser sheet of light solution to determine component position, component symmetry about the centreline, step profiles and the presence of localised high or low spots. Read more

System setup is by positioning the tripod mounted laser sensor close to the TMB drum and rotating the drum at normal speed. Encoder feedback or use of a "Top of drum" marker is used generate profiles. During 1st stage building of the carcass a 3D profile of the liner, abrasion strips and body plies may be obtained. For the 2nd stage process a 3D profile of the steel cord, cap ply / JBL and tread may be obtained. In both cases profiles may be used to determine component positions and step profiles.

System features:

Laser spot sensor or laser sheet of light sensor mounted on a tripod adjacent to 1st stage or 2nd stage TBM drum.

Determine position, symmetry, step profiles, radial runout and high/low spots of the green tyre.

Lap top based software and user interface for display of profiles and target values.

Statistical reporting and network compatible.

Simple to set up, operate and maintain.

Runout measurement accuracy to <0.02mm.

Profile measurement accuracy to <0.2mm.

Click on each image for a large version

Green tyre 3D profiling

3D height maps of green tyre

Green & finished tyre runout