Physical effects of Solid Particulate Contamination in Grease- Lubricated Ball Bearings

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สิทธัตถ์ มาดี ประมุข แย้มบุญชู

Abstract

This research was conducted on contaminated particles which are larger than the grease film into the bearings to investigate for abrasion failure generally occurs on ball bearings. In the experiment, the bearing design was tested in two cages can be tested simultaneously using a 1 HP 3P motor to rotate the shaft with the bearing set installed. The speed of the motor inverter can be adjusted with a speed of 1,450 RPM. The experiment is divided into 7 experiments. The experiment time setting is 240 minutes / time. There are six types of solid particles used in the experiment, the sand particles, Grinding powder, Dust Cutting, Rubbing Compound, Stone, the sand paper and particles of cutting tool. Particles of contaminants that enter the bearings are different sizes. The results of the experiments by using the microscope camera for investigating have found that the Inner Race, the Outer Race, and the Ball, all three of which do not have any scratches from the contaminations of Sand made of sandpaper, Dust Cutting, Rubbing Compound, Fine sand and Stone, but can be scratched on the Ball and dented into the Inner Race from the use of cutting tool particles. It was found that under a speed of 1,450 RPM and a trial time of 240 minutes / time. The particle size of the grease film was 50-150 microns, which is smaller than the particle material entered into the Bearings.

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