Abstract
The paper reports an analysis into tribological efficiency of mating parts materials ‒ is carried out. Improperly selected materials produce significant operating costs in terms of tribology. Therefore, selecting the type of polymeric-composite materials to be used in the structures of nodes and machine parts is a task related to substantial improvement of their technical level. The testing of samples made from polymeric-composite materials for relative abrasive resistance when mated with samples made from has made it possible to establish that the lowest value for weight wear was demonstrated by material 66. Among the examined materials, the closest to 66 in terms of the values for relative abrasive resistance is the material that demonstrated the values that are 1.65 times less. During operation of machines, in the presence of abrasive wear, it is advisable to mate the materials Nylon 66 – 45 and PA-6-210KS – 45. The results from a tribotechnical study without lubrication at the friction machine SMC-2 for the mating parts material – 45 make it possible to establish that the least wear was demonstrated by sample made from the material that is 0.00083 g. In terms of wear resistance, the closest to it is a sample from the material PAG/6.6 R196-GF30, which is 6.1 times greater for weight wear. The sample made from mated with a sample from the material UPA-6-30 has the lowest value of weight wear, 0.00005 g. At the same time, the lowest value for the friction coefficient is demonstrated by the mated materials steel – UPA-6-30, 0.163. The progress of the mating process is achieved fastest, after 20 minutes, when using the material UPA-6-30 at a temperature in the friction zone of 348±2 K. Our research is necessary to substantiate further utilization and selection of polymeric-composite materials for mating parts working under difficult conditions. The current study is of interest to manufacturers of agricultural and quarry machinery and various transport machines.
Highlights
Results of operating agricultural machinery by various manufacturers at agricultural enterprises reveal that their rated efficiency is significantly different from actual
Results from our study of samples of polymeric-composite materials for relative abrasive resistance when mated with steel 45 have made it possible to establish that the smallest value of weight wear was demonstrated by material No 1 (Nylon 66), which was chosen as a reference
The closest values to the reference for the respective abrasive resistance among the examined polymeric-composite materials were demonstrated by material No 2 (PA-6-210KS), 1.65 times smaller
Summary
Results of operating agricultural machinery by various manufacturers at agricultural enterprises reveal that their rated efficiency is significantly different from actual. The main cause of low reliability of machines and mechanisms is the use, for moving mated parts of tribojunctions, of a material the type of “steel-steel”, which demonstrate a low level of tribological efficiency. Ensuring proper technical condition of moving mated machine parts is predetermined, first of all, by their high tribotechnical characteristics, that is, the proper level of tribological efficiency. The scientific-technical literature on the use of materials for heavily loaded mating parts notes that for machine engineering the most promising among them under respective operating conditions in agricultural and transport industries are the polymeric-composite materials. The physical-mechanical and tribological properties of polymeric-composite materials have not been studied sufficiently enough to substantiate their implementation for movable junctions of machine parts. Materials Science of machines, there is a need to prove the experimental feasibility of their application from a tribophysical point of view
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