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 an analysis of the maintenance system of the powertrain component of the Omni Power agrorobot and the Seed Master seeder, which is aggregated. It is shown that the specified equipment has different maintenance systems, the regulations of which are inconsistent with each other. The results of the calculations of forces in the moving connections of the seeder in the case of the use of carbon- plastic parts are presented. It is indicated that carbon-plastic details have a safety margin coefficient of 4.2 to 6.5 under different operating conditions. The results of field tests of the seeder, equipped with experimental parts developed at the Dnipro State Agrarian and Economic University, are presented. It is shown that the use of such parts does not require maintenance, and their replacement is advisable when the seeder works for 3500 hours. Thus, if the developed parts are used in the equipment that will be aggregated with the Omni Power agrorobot, the harmonization of the maintenance systems of the energy part of the agrorobot structure and equipment will be achieved.