High-Frequency Reciprocating Rig (HFRR)
The two-station Fuel Lubricity Wear Test Machine incorporates two test
positions with heater pads and mounting arrangements for fuel lubricity
test specimens. Load is applied manually by means of dead weights directly
to the fixed ball specimen carrier by means of a loading yoke. Machine
controls are limited to speed control of the drive motor to give the
required frequency, temperature control of the specimen bath and test
duration. Test data is limited to post test wear scar measurement only
and no facilities are provided for friction force measurement.
The electro-mechanical drive is used to achieve a wide range of frequencies,
and the 1 mm stroke is generated with a cam. This ensures that the amplitude
remains constant as friction forces vary in the contact. The ball specimen
is mounted in a holder connected to the horizontal oscillating shaft.
The shaft is double ended and two tests can be run at the same time.
The holder is hinged to ensure that the line of action of the oscillator
remains in the horizontal plane of contact. This also means that loads
can be applied directly to the contact without loading the oscillator
shaft. A simple yoke locates on the oscillating shaft and load is applied
by calibrated weights.
The plate specimen is located in a bath that both seals and clamps the
specimen. Beneath the bath is a block that is heated by an electrical
resistance element and the temperature is controlled by a thermocouple
closely located beside the specimen. Each heater block is mounted on
a stiff fabricated support. A clear acrylic cover is provided to house
the test heads. Operation of the machine is straightforward. The machine
is equipped with two digital programmable controllers for temperature.
Temperature setpoint can therefore be set independently for each station.
In addition, there is a digital programmable frequency controller and
The controllers are pre-set when the machine leaves the factory to the
operating conditions required of the test methods. Once enabled, the
machine heats each of the baths to a set point of 60°C. Once this
temperature is reached the motor is switched on automatically to run
at 50Hz. The test timer is preset for the duration of 75 minutes, which
commences once the motor starts. At the end of the test the machine
automatically switches off.
Test specifications: ASTM D6079; ISO 12156
Contact Geometry: Ball on Plate
Ball Specimen: 6 or 10 mm diameter
Load: 1.95 to 10.00 N (± 0.01 N)
Stroke: 1 mm (± 0.02 mm)
Frequency: 2.5 to 50 Hz (± 1 Hz)
Fluid Volume: 2 mL (± 0.2 mL)
Test Temperature: Ambient to 100°C
Heating Power: 250W at each station
Temperature Sensor: K-type thermocouple
Test Duration: 75 min (± 0.1 min)
Bath Surface Area: 6 cm2
115V 50/60Hz, Single Phase
230V 50/60Hz, Single Phase