| Popis: |
This paper presents the influence of load and sliding velocity on several tribological parameters like friction coefficient and wear rate of the wear scar diameter of the balls used in a four-ball test, when using rapeseed oil as lubricants. The test parameters for were: loading force - 100 N, 200 N and 300 N (± 5%), sliding speed of 0.38 m/s, 0.53 m/s and 0.69 m/s, corresponding to the spindle speeds of the four-ball machine 1000 rpm, 1400 rpm and 1800 rpm (± 6 rpm), respectively, test time - 60 minutes (± 1%). The test balls are lime polished, made of chrome alloyed steel balls (EN31), having 12.7±0.0005 mm in diameter, with 805 N/mm2 hardness VHN, as delivered by SKF. The sample oil volume required for a test was 8 ml ± 1 ml. A general view of the results on friction coefficient reveals that this vegetal oil could be used in application with mild regime as concerning the load and speed. |
