|
 | 
|
The TE 90 Short Stroke High Frequency Friction Machine combines many of the features of the standard TE 77 High Frequency Friction Machine with the simplified loading and driving mechanism of the TE 80 Fuel Lubricity Wear Test Machine. It is designed primarily as replacement for the TE 70SLIM Micro Friction Machine.
The TE 90 is a bench mounting test machine offering friction evaluation and wear testing in a reciprocating ball-on-plate contact configuration. The unit is designed for testing under lubricated and unlubricated contact conditions at fixed stroke under light loads at varying frequencies.
The control unit includes the SLIM 2000 Serial Link Interface Module and SLIM COMPEND control and data acquisition software. The TE 90 conforms to the test conditions specified in the ISO/DIS 12156-2 HFFR Diesel Fuel Lubricity Test.
The TE 90 uses a motor driven fixed stroke scotch yoke drive mechanism of similar design to that used on the successful TE 77 High Frequency Friction Machine, but at a reduced scale. The ball or cylinder specimen is mounted in a holder connected to the horizontal oscillating moving specimen shaft. The holder is hinged to ensure that the line of action of the shaft remains in the horizontal plane of contact. This also means that loads can be applied directly to the contact without loading the shaft.
A simple yoke locates on the top of the moving specimen holder and load is applied by dead weights applied to a load pan, which is guided by a linear bearing.
The fixed plate specimen is located on two screw fittings in a stainless steel reservoir. Special inserts are provided for mounting the ISO Fuel Lubricity Test specimens. The reservoir is clamped to a block that is heated by two electrical resistance elements and the temperature is monitored by a thermocouple pressed against the side of the specimen or holder.
The heater block is mounted on two flexures, which are stiff in the vertical (loading) direction, but offer small resistance to horizontal forces. Movement in the horizontal direction is resisted by a piezo-force transducer and this measures the friction forces in the oscillating contact.
The ball carrier is electrically isolated from the plate specimen. This allows a millivolt potential to be applied across the contact from a Lunn-Furey Electrical Contact Resistance Circuit. Variations in this voltage are indicative of the level of metallic contact, provided that both test specimens are conductors of electricity. This measurement is valuable for observing the formation of chemical films from anti-wear and extreme pressure lubricants, the breakdown of non-conducting layers and coatings or the build-up of oxides.
Both the contact potential and friction force signals are time smoothed by true rms/dc converter for data logging purposes.
The TE 90 has PC based sequence programmable control and data acquisition. This is provided by an integrated Serial Link Interface Module and COMPEND 2000 software running on a host PC, operating under Windows. Data is stored to hard disc in standard spead sheet compatible file formats (.csv or .tsv).
Tests are defined by a sequence of steps, each step containing set-point, data recording rates and alarm level information. Set-points may be adjusted by step change or ramp. The test sequence is followed unless interrupted by the operator or an alarm. Set-points may also be adjusted manually using on screen toggles.
| Contact Configurations: | Ball on Plate |
| Cylinder on Plate | |
| Plate Specimen: | 22 mm x 40 mm x 2.5 mm thick (standard) |
| ISO Test Plate: | 10 mm diameter |
| Ball Specimen: | 6 mm and 10 mm diameter (standard) |
| ISO Ball Specimen: | 6 mm diameter |
| Cylinder Specimen: | 6 mm diameter x 12 mm long |
| Load: | 2 to 20 N |
| Stroke: | 1 mm |
| Frequency: | 2.5 Hz to 50 Hz |
| Temperature: | Ambient to 200°C |
| Heating Power: | 400 W |
| Temperature Sensor: | k-type thermocouple |
| Friction Transducer: | Piezo-Electric |
| Contact Potential: | 50 mV dc signal |
| Interface: | SLIM 2000 Serial Link Interface Module |
| Software: | COMPEND 2000 |
| Specimen Load |
| Frequency | |
| Temperature | |
| Test Duration |
| Friction Force | |
| Temperature | |
| Contact Potential | |
| Test Duration | |
| Friction Coefficient |
| Electricity: | 220/240V, single phase, 50 Hz, 1.2 kW |
| 110/120 V, single phase, 60 Hz, 1.2 kW | |
| PC and Printer: | Minimum Specification |