INFLUENCE OF LUBRICATION ON ENDURANCE OF ROLLING CONTACTS.
Abstract
Additional radioactive wear tests at 150 lbs load were run in a rolling four-ball testing machine. The wear vs speed function followed the same trend observed at a load of 50 lbs. The rolling speed above which the wear is negligible, according to the radiotracer results, corresponds to the speed at which previous electrical conductivity results had indicated essentially complete hydrodynamic separation of the surfaces. Preliminary endurance tests on 1/2-in. steel balls were run in a rolling 4-ball (Barwell) testing machine under a series of loads. The purpose of these tests was to determine the load range within which the cubic load-life relationship (as found for complete ball bearings) is valid. Test results indicate that for 52100 steel balls of 62-64 R sub c hardness, the theoretical loadlife relationship is valid up to a spindle load of 182 lbs on a 4-ball set of 1/2-in. balls having 40 degree contact angle. Some further development of the mathematical theory of electrical contact oacurrences is presented. A description of experimental arrangements and procedures used to analyze the microgeometry of ball surfaces is presented. Results frnm this analysis serve as an input to the electrical contact thenry 4entioned above. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 22, 1963
- Accession Number
- AD0421866