SECTOR FOCUS: TESTING


Triboscreening for industrial lubricants


Ameneh Schneider, Gregor Patzer, Optimol Instruments Prueftechnik GmbH, Munich/Germany


Introduction: The SRV®


Test System (Schwing Reib Verschleiß – oscillation friction wear) developed by the lubricant industry. It was designed as a development tool of Optimol Ölwerke, a German lubricant manufacturer. In 1964, Optimol pioneered oscillatory test motion. Oscillatory movement created stressful operating conditions and produced distinguishable results. Since then, oscillatory test motion has been established worldwide as a quick and effective way of tribotesting. Decades of expertise in analysing application problems very close to daily practice resulted in the development of the latest generation. Figure 1 shows the SRV®


5 equipped with a touch screen and changeable load module. Figure 1. SRV® 5


range from 0.001 Hz to 500 Hz with strokes of 0.01 mm to 5 mm. With 3 different changeable load modules the normal loads can be adjusted in 3 different ranges up to 2500 N. Ambience conditions, such as test piece temperature (-40°C to 1000°C), humidity (30% RH – 90% RH) or atmosphere (gases, steam, etc.) can be controlled by using optional features.


Precision is one of the most important features a tribo-testing system needs to provide. SRV®


is the


industry standard in tribological model testing. 20 international and national standards have been achieved with this tribometer up to now. The precision will be proved annually by Round Robin (RR) tests, that are carried out by more than 120 participants. Figure 2 shows the number of participants for RR tests from the beginning of the SRV®


development.


The basic SRV®


system, equipped for oscillation, has


an electromagnetic linear drive, which generates – as the relative motion of the test contact – a periodic sinusoidal translational movement in the frequency


26 LUBE MAGAZINE NO.144 APRIL 2018 Figure 2. Distribution of SRV® models used in RR tests


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