Abstract
Values of static and kinetic friction coefficient in micro slide bearings, consisting of journals and bushings (with the diameter of 3.5 mm) made of pairs of 5 polymer materials (16 chosen combinations of PA11, ABS, PC, PS and PETP), were determined. A method of measuring static and kinetic friction coefficient, at various values of: load, rotational speed, and standstill time, as well as the structure of a dedicated test rig, were discussed. Chosen mechanical properties of polymers measured using indentation method, and conclusions from the conducted experiments, are shown. The presented results provide key information for a proper choice of polymer materials, which are to work as a friction node. The biggest observed difference in the moment of friction among the tested slide bearings reached almost 40% (with respect to the highest value).
Highlights
Due to technological reasons: injection, 3D printing, polymers are more and more often implemented in manufacturing machines and devices [1]–[5]
Journals and bushings made of 5 thermoplastic polymers Polyamide 11 (PA11), ABS, PC, PS and PETP were used. 16 material combinations were studied
Hardness and viscosity of each of the studied polymers are given in Table 1, calculated on the basis of transformed Eq (5), (7), (4), respectively
Summary
Due to technological reasons: injection, 3D printing, polymers are more and more often implemented in manufacturing machines and devices [1]–[5]. Mainly due to the development of 3D printing, one may encounter devices, in which there are mating polymer pairs of friction elements in the form of: slide bearings, gear wheels, guideways. A variety of polymers available on the market constitutes a significant problem for a designer, whose task is, among other things, their optimal choice with respect to tribological reasons. Tribological aspects of polymers in mechanisms and micromechanisms have been found to be a major issue in durability of those devices [6]–[9]. Companies manufacturing polymers introduce their own designations and keep the chemical composition and technological process of manufacturing secret.
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