Abstract
The reliability of hydraulic cylinder sealing units is largely determined by the physical, mechanical and tribological properties of polymer materials of the support and guide rings. They provide optimal loading conditions for sealing assemblies and reduce wear of hydraulic cylinder parts. Analysis of loading conditions and failures of hydraulic cylinder support and guide assemblies shows that when modeling loading, it is necessary to synchronously take into account the processes of friction, wear and accumulation of residual deformations in polymer rings. The concept of accelerated loading of nodes, developed on the basis of the finite element method, allows you to simultaneously describe all the processes occurring during the period of trouble-free operation of the support and guide units of hydraulic cylinders. (Research purpose) The research purpose is evaluating the effectiveness of the use of polytetrafluoroethylene, polyamide 6 and composites based on them in the support and guide units of hydraulic cylinders on the basis of numerical approaches for determining the reliability of assemblies with polymer parts. (Materials and methods) Developed and implemented in ANSYS a finite element model of multi-cycle loading of hydraulic cylinder support and guide units. We performed a series of calculations for polytetrafluoroethylene, polyamide 6 and composites based on them. (Results and discussion) It was shown that the run-in period of polymer rings does not exceed two years. The service life of polymer rings is mainly determined by the processes of wear, and not due to the accumulation of residual deformations. It was revealed that the operating time for failure of support and guide assemblies with polymer rings is: polytetrafluoroethylene - 2.08 years, composite (polytetrafluoroethylene + 20 percent carbon) - 3.91 years, polyamide 6 - 3.11 years, composite (polyamide 6 + 0.5 percent graphite + 2 percent shungite) - 7.08 years. (Conclusions) The developed composite provides an increase in the service life of the rings of the support and guide units of hydraulic cylinders by more than 1.8 times compared with polytetrafluoroethylene and a composite based on it.
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