TUG

Uniformity measurement in production lines is a difficult subject regarding compactness, robustness, cycle time and reliability. inmess is a leading provider of Tire uniformity measurement machines

Tire Uniformity Grading Machine (TUG)

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Tire Uniformity Grading Machine (TUG)

The tire uniformity measuring machine is used to measure the tire uniformity for complete vehicle wheels and determines the radial and lateral force fluctuations of the rolling wheel, optionally its ply steer and cone effect, as well as the radial and lateral runout and customer-specific calculations such as TUZ for example.

The machine is optionally available with a DOT detection system as well as a geometry measuring system

Measurement process

The wheel to be measured is fed in and centered by the centering unit. Here it is assumed that the complete wheels are made available by the conveyor technology with an accuracy of ±30 mm transverse to the conveying direction. If this cannot be guaranteed, the cycle time will be adversely affected.
The outside diameter of the wheel is measured via the centering.
The measured diameter is compared with the test plan. If there is a deviation, the system goes into malfunction.
After centering, the main wave will be lifted by the fixture. The wheel will be centered and clamped.
The load wheel will be pressed against the tire by means of a ball screw spindle, according to the given clamping force.
The forces are absorbed by the load cells in which the load wheel is installed and transmitted to the machine control system.
For the process it is necessary that the wheel type is transmitted to the machine via barcode reader (optional) or conveyor control. The wheel type or wheel number can also be entered via the existing touch panel. This information is necessary to position the sensors for the run-out and lateral run-out measurement.
The recorded measured values are visualized, classified and transferred to the plant control system. Based on the results and the tolerances stored in the test plan, an IO/NIO decision is transmitted.

Applied Standards and Patents

2006/42/EG -CE machinery directive
WDK-directive 109-2- Uniformity measurement of pneumatic tires Radial and lateral force variation
WDK-directive 109-3-Uniformity measurement of pneumatic tires Test condition for passenger car tires
WDK-directive 109-8- Uniformity measurement of pneumatic tires Test parameters and quality values for passenger car tires
WDK-directive 109-9-Uniformity measurement of pneumatic tires- Test parameters and quality values for motorcycle tires
SAE International J332– Testing Machines for Measuring the Uniformity of Passenger Car and Light Truck Tires
ISO 13326 Test methods for measuring tyre uniformity
WO 2004-010095 – inmess Patent Method of checking the air pressure in vehicle wheels with pneumatic tires.
DE 10 2020 000 157.2 Inmess Patent registration ”Tire uniformity measurements – compensation of load wheel and fixture for wheel assemblies and tires ”