Continued from page 25
There was only one outlier in the case of fluid B when used in a combination of steel and 16MnCr5 for all test results. In such cases a third test will be recommended.
For all material pairings, coolant C has shown the best tribological performance followed by coolant B and A.
Running the tests with the same parameters as for steel but with aluminium as workpiece, the results were not so clear but still repeatable.
Looking at the values in the first 10 minutes (ramping the velocity from 0 to 3.14 m/s) one can see that the correct test speed for aluminium for all three fluids should be maximum of 1 m/s. At higher velocity the ranking of fluids was not possible (see Figure 6).
• SRV®
allows to determine the optimised parameters for any material pairing.
This new MWF set-up for SRV® rotation modus
enables the formulators to identify, test, confirm and finally find the best MWF for multi-metal application. Additionally, it helps to solve upcoming challenges such as improved economic efficiency of manufacturing processes by using more efficient formulations for extending the tool life.
References:
[1] Radoslav Rakic et al, The influence of the metal working fluids on machine tool failures; Wear, Vol. 252 (2002), Iss. 5–6, Pages 438-444 [2] Neil Canter, Metalworking fluids: Current options for machining multi-metal alloy, TLT magazine March 2022, Pages 44-54
www.optimol-instruments.de
Figure 6: CoF-values for 3 coolants during speed ramping for Al as workpiece.
Optimising of speed and other test parameters, such as normal load for aluminium, is carried out by Optimol Instruments for these three and many other fluids. The results are ongoing and will be presented in due course.
Summary
For steel as a workpiece: • A good differentiation in performances can be shown for all selected material pairings with this new set-up.
• Repeatability of results is very good. • Temperature fluctuations during the tests for the disk and coolants are stable: + 1 to 2 °C due to good cooling effects • Online wear measurements work precisely.
For Aluminium as a workpiece: • Different activity of additives to Al-alloy surface is observed.
• For ranking of fluids, the test parameters should be adapted.
• Repeatability was also good in this material combination.
https://www.brb-international.com/lac
Technology in Motion
The art of new perspectives: At BRB Lube Oil Additives and Chemicals, we see and do things differently. Our business is not just about developing components for your formulations, it’s about fast-forward innovations that master tomorrow’s challenges today.
LUBE MAGAZINE NO.174 APRIL 2023
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