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Friction Quality Test(FQT)

Real-scale brake testing machine at constant speed.
- An AC motor makes the brake disk rotate at a constant speed of 660 rpm.;
- At programmed time intervals brake applications are actuated.
They may be controlled in pressure or in torque modalities.
Use of the machine:
- It is a reference machine typically used for quality control or for the development of materials in the After Market sector:
  • A (sample) test is carried out on a given sample brake and the results are filed;
  • The brake component (lining, disk, caliper), the quality of which is required to be tested or which is in the development phase, is then fitted and the sample test repeated;
  • The differences between the sample and the tested material are evaluated by analyzing the results.
  • Features
    - The machine is managed by a PC, which monitors the tests execution.
    - The operator defines the following parameters by interacting with a test description environment:
    - The braking times and the pause between consecutive brakings.
    - The maximum and minimum temperatures for the testing and cooling phases of the brake.
    - The control modalities of each single brake application:
  • In pressure.
  • In torque.
  • In force (applicable if the machine is equipped with the Hand Brake option).

    - During the test, the following Time Histories are recorded:
  • Six temperatures (two of which inside the rotating part of the brake).
  • Pressure.
  • Torque.
  • Residual torque.
  • Force and stroke of the hand brake (optional).
  • Technical characteristics:
    - 140 kW motor.
  • - Maximum torque: 2 kN*m.
  • - Maximum pressure: 200 bars.
  • - Maximum force applicable to the hand brake: 2 kN.
  • - Maximum stroke of the hand brake: 500 mm.
  • Options
    - The machine can be equipped with:
    - Hand brake.
    - Automatic sprinkling of the brake (also with “salt” water).
    - Additional AC motor with vectorial control for tests at a low number of revolutions (from 0 to 10 rpm). This option allows the following types of tests to be carried out:
    - Evaluation of the friction at 3 rpm.
  • Sticking: evaluation of the detachment torque after the brake has been operated for 24 consecutive hours without any release.
  • Evaluation of the static friction (with the brake activation controlled under pressure or force exerted on the hand brake).
  • Hill hold: evaluation of the static holding of the brake during the cooling phase.
  • Creep Groan: research on the noise when starting to move.