Study of the Condition of the Surfaces Covered by Selective Transfer for the Spindle-Bearing Friction Pair

Abstract

Filip Ilie*, Alina Juganaru and George Ipate

The operation of pairs with minimal friction and wear (the friction pairs case with selective transfer) depends on the quality of the contact surfaces, the arrangement of the friction surfaces asperities, the geometry of the friction pairs surfaces, and the operating parameters (load, speed, operating environment, etc.). They influence the friction and wear behavior of the friction pairs, under the conditions of selective transfer. For the selective transfer study and the research of the roughness of the elements of a friction pair (here, the spindle-bearing pair of the sliding bearing), the friction pair elements kinematics, which causes the appearance and development of the selective transfer must be considered. Through selective transfer, a copper film appears on the friction surfaces, with little roughness. After the appearance of the copper film (with an average thickness of 2 μm), the friction surface roughness in the contact area is minimal (due to the selective transfer), becoming optimum so that friction and wear are as low as possible and confer that state of balance for which the friction pair operates with friction and wear, minimal. Therefore, the paper aims the study the asperities of the friction surfaces formed by selective transfer to the spindle-bearing friction pair, analyzing their macro and micro geometric parameters, for an operation with minimal friction and wear.

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