International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The study investigates the influence of carbon fiber content (10, 15, and 20 wt.%) on the physico-mechanical and tribological properties of polyamide-6-based carbon fiber reinforced plastics intended for agricultural machinery applications. The composites were manufactured by extrusion and tested for compressive strength, friction coefficient, wear resistance, abrasive wear resistance, and hardness. The results showed that increasing the carbon fiber content improved strength and wear resistance while reducing the coefficient of friction and contact temperature. The CPA-6-20 composite showed the best overall performance, combining high strength, low friction and superior wear resistance. The obtained results confirm the potential of carbon fiber reinforced polyamide-6 composites for use in friction units and structural components of agricultural machinery.

The article presents a technology of carbon plastics producing based on polyamide-6 with the incorporation of PMS-400 grade lubricant into the material structure. A brief review of the results of carbon plastic applications in engineering is provided. The research methodology and initial parameters are outlined. The experiments were carried out using a single-screw extruder EKG-45, modernized to produce the carbon plastics. As the object of the study, a laboratory-produced carbon plastic СPA-6-20 was used. This material is a carbon plastic based on polyamide-6 reinforced with 20 wt.% carbon fiber. Experimental results established that the optimal screw rotation speed of the EKG-45 extruder is 90 min⁻ ¹. Under this processing mode, the compressive yield stress increased by 4%, while the impact toughness rose by 4.5%. At this stage of the research, mechanical strength properties were considered, as the most critical for applications in heavily loaded components of moving joints. The investigations carried out at the Dnipro State Agrarian and Economic University.

The paper presents the method of combining the results of soil compaction, which were obtained by the penetrometer of Ukrainian production S 600, into the software of digital agriculture. For example, it is shown how to enter the obtained soil compaction data into the AFS software.

The expediency of using parts made of polymer composites in moving joints of machines in the oil and fat industry is shown. The use of experimental moving joints provided an increase in the resource from 500 hours to 1080 hours minimum. Diagnostics of experimental moving joints revealed that some of them have signs of transfer of the composite material to the steel shaft. This is explained by the following factors: the presence of the transfer effect and operation at high temperatures of 140 °C. The operating modes of the equipment are maintained. Most of the experimental parts made of polymer-composite material are in a running-in state, as wear has not been recorded in them.