swinging heavy loads and composite the joint action and failure

Abstract: aerospace, defense and some cutting-edge technology for self-lubricating bearings used more widely, bearing joints work in these areas is more complex conditions are often subjected to high-frequency pendulum, swinging heavy loads and composite the joint action and failure, but there is no uniform test equipment and test criteria to evaluate the self-lubricating bearings tribological properties, which severely restricts the reliability of self-lubricating bearings and bearing product upgrading. This article based on domestic self-lubricating bearings and overview of the development of test equipment proposed composite swing joint bearing performance test machine, and carry out the detailed design of the testing machine, calculation, installation, and commissioning work, through a type of self- lubricating bearings for friction and wear performance test to verify the test machine performance, this model also discussed joint bearing wear mechanism. The main research work is as follows: For the composite swing, high frequency, heavy self-lubricating bearings under conditions of friction and wear performance, service life and reliability of the design of the testing machine program, which implements joint bearing composite swing, breaking the current reported joint bearing testing machine wobble frequency does not exceed the limit of 1Hz to solve the wobble frequency and contact pressure can not raise conflicts. Draw a testing machine assembly diagram and drawings of each part of the process to complete the testing machine powertrain, loading system and the measuring system installation and commissioning work. Through simulation and performance tests on the test machine main parameters of the error analysis, the results showed: These parameters relative errors are less than the current literature, or equivalent, to meet the test requirements of precision. Meanwhile measurement repeatability of test data and test machine for different joint bearing friction and wear tests were evaluated for effectiveness, proven high repeatability of the test machine, and can be of different test pad bearings. Through a type of self-lubricating backing bearings for tribology testing, analysis of different forms of swing, swing different frequencies and different pressures on self-lubricating bearings friction and wear performance, verify the test machine of each system design is reasonable, operation stability and accuracy of measurement data, etc., to achieve the desired design goals. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and three-dimensional topography profiler on self-lubricating bearings friction and wear surface microscopic analysis, discusses its wear mechanisms under different conditions, the results showed that: mainly extrusion wear, abrasive wear, adhesive wear and fatigue wear.