TE 91 PRECISION ROTARY VACUUM TRIBOMETER

 





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    Description

    The TE 91 Precision Rotary Vacuum Tribometer is based on a bench mounted test chamber. A motor driven test spindle, in the form of standard rotary feedthrough, projects downwards into the chamber and carries tooling for mounting rotating test samples. A servo motor with encoder feedback provides a variable speed turn-down ratio of 100:1.

    The various fixed specimen test adapters may be mounted on a mandrel projecting through the bottom of the chamber and coaxial with test spindle. The mandrel is sealed to the chamber by means of a flexible stainless steel bellows. The non-chamber end of the mandrel is attached to a cross beam, which is guided by linear bearings on the vertical machine columns. The beam is loaded from underneath by a pneumatic bellows actuator assembly which includes an in-line force transducer for measurement of the load applied outside the chamber.

    The force applied by the actuator is adjusted by means of a precision servo pneumatic valve. A second force transducer may be mounted inside the test chamber to measure the resulting in-chamber load force in order to calibrate the external load force transducer for different chamber operating pressures.

    The friction torque measuring assembly incorporates a linear torsional flexure, the rotary displacement of which is sensed by means of a linear capacitance probe. The capacitance probe is subjected to an oscillating frequency and the response measured correlates with the change in capacitance as the gap between probe and target varies. As a charge as opposed to current device, the sensor is not subject to the unwanted sensor heating effects associated with equivalent strain gauge devices.

    Test Assembly with Capacitance Probe

    The fixed specimen tooling is electrically insulated from its surroundings and the rotating test spindle is fitted with an electrical slip ring allowing electrical contact potential measurements to be made across the specimen contact.

    Bake-out heaters are provided within the test chamber to assist with out-gassing.

    Bake-out Heaters On

    Sliding Friction and Wear Tests

    Sliding friction and wear tests are performed with test configurations equivalent to those specified in ASTM D2266 (sliding four ball), ASTM D3702 (thrust washer) and ASTM G99 (three in on disc).

    Four Ball Adapter

    Pin on Disc Adapter

    Spiral Orbit Adapter

    Rolling Contact Fatigue Tests

    Rolling contact fatigue tests may be performed using the spiral orbit ball on disc test configuration. A lubricated ball is clamped between two parallel plates with one plate fixed and one plate rotating. The ball follows a spiral track and is maintained in orbit by contact once per revolution with an instrumented guide plate.

    Instrumentation used with this adapter includes an orbit counter, piezo transducer and charge amplifier for scrub friction measurement and a high speed data acquisition card for scrub force data capture.

     

     

     



  • Technical Specifications

    Tribometer
    Load: 20 to 2000 N
    Rotational Speed: 10 to 1700 rpm
    Maximum Friction Torque: 5 Nm
    Load Actuation: Pneumatic Bellows
    Test Configurations: Four ball wear (ASTM D2266)
    Thrust washer (ASTM D3702)
    Three pin on disc (ASTM G99)
    Spiral orbit ball on disc (ASTM F2661)
    Motor Type: Servo with encoder feedback
    Roughing Pump: Rotary vane pump
    Vacuum Pump: Turbomolecular
    Interface: Serial Link Interface Module
    Software: COMPEND 2000
    Test Chamber
    Vacuum: Down to 100 Picobar (10-5 Pa)
    Environment: Air, inert gas or vacuum
    Material: 304 stainless steel
    Surface Treatment: Glass bead blasted
    Viewports: Fused Silica
    Electrical Feedthrough: 1 kVolts , 15 Ampere
    Coaxial Feedthrough: BNC through Flange
    Thermocouple: Type K through Flange
    Vacuum Transducer: Cold Cathode and Pirani
    Leak rate: < 10-7 mbar l/s
    Rotary Feedthrough: Pressure up to 10-7 Pa
    Rotary Feedthrough: Temperature up to 80ÂșC
    Computer Controlled Parameters Rotational Speed
    Test Duration
    Load
    Manually Controlled Parameters Operating Pressure
    Recorded Parameters – Sliding Friction & Wear Load
    Rotational Speed
    Friction Torque
    Temperature
    Operating Pressure
    Electrical Contact Potential
    Number of Revolutions
    Test Duration
    Sliding Speed
    Sliding Distance
    Recorded Parameters – Rolling Contact Fatigue Load
    Rotational Speed
    Scrub Force
    Temperature
    Operating Pressure
    Electrical Contact Potential
    Number of Revolutions
    Number of Ball Orbits
    Test Duration
    Services
    Electricity: 220/240V, single phase, 50 Hz, 3 kW
    110/120 V, single phase, 60 Hz, 3 kW



  • Publications

     

  • Applications

    aerospace materials
    ball on disc
    ceramics
    coatings
    hertzian contact
    rolling bearing materials
    space applications
    spiral orbit tribometer
    thrust washer
    ultra high vacuum

  • User List

    Launched 2011

    Lanzhou Institute of Physics China
    SINOPEC RIPP China


  • Download the Machine Leaflet