Tribotechnical research into friction surfaces based on polymeric composite materials
The technique of controlling coefficients of friction and temperature was developed. As a result of application of a tribometer, which excludes misalignment of the sample and the counter sample, it was possible to avoid the macro-alignment. Applicability of the Euler’s formula for calculating friction coefficients was proved both when operating by the scheme «shaft - sleeve» and when operating with a flexible steel belt - the counter sample. The developed technique of controlling the mode of friction and lubrication by the character of oscillograms and by measuring temperature change rate ΔT/Δt allowed determining the region of boundary friction. This is the range of small velocities of up to 0.1 m/s, on which at an increase of sliding velocity V, temperature increase rate ΔT/Δt also grows. Comparative research into tribotechnical characteristics of the polymeric material «Moglice» and the developed new polymeric composite material DC-6 were conducted. Coefficients of sliding friction of the couples «cast iron - DC-6» and «cast iron - moglice» are close in magnitude and are within 0.050…0.058. Temperature of friction of materials «Moglice» and «DC-6» increases with an increase in sliding velocity up to 0.078 m/s and reaches 60 °C and 70 °C, respectively. Thus, to restore damaged or worn friction surfaces of metal-cutting machine tools, it is possible to apply such polymeric materials as «Moglice» and «DC-6». The composite polymeric material «DC-6» has friction coefficients and thermal resistance, which are similar to those of the polymer «Moglice» and can replace the more expensive repair material «Moglice». This result opens up broad prospects for the application of new polymeric material that would significantly reduce the cost of repairing and restoration work of the guides of machine tools.