Abstract
The working parts of tillage machines, including harrow discs, wear out and fail during tillage. Basically, they are hardened at the manufacturing stage to increase wear resistance. Conducting tests to verify their operability in order to select the most effective hardening technologies requires a lot of time and material costs. A modern alternative to these tests is the use of computer simulation at the initial stage of the selection and development of hardening technologies. (Research purpose) The research purpose is investigating and evaluating the influence of technological factors on the wear resistance of the working parts of tillage machines, in particular harrow discs, using computer modeling tools. (Materials and methods) Carried out computer simulation of their working conditions using the computational fluid dynamics method by using the SOLIDWORKS Flow Simulation program to evaluate the effectiveness and selection of various hardening technologies. We created solid-state disk models that were used to simulate the operating conditions of harrow disks with various parameters. (Results and discussion) As a result of modeling, pressure distribution patterns were obtained, which are a color gradient on the selected surface of the model, showing the values of soil pressure on the disk. The pressure distribution on the disc of the disc harrow in the factory version and with reinforcing rollers at various angles of attack of 10, 15 and 20 degrees and speeds of 6, 12 and 24 kilometers per hour was shown. The patterns of pressure distribution on the disk with various geometric parameters of the applied reinforcing rollers were revealed. (Conclusions) With all the various technological factors presented, the harrow discs with reinforcing rollers showed a decrease in soil pressure on their surface. It was found that the pressure of the soil on the disk is most strongly reduced when applying rollers with a width of 6 and a height of no more than 2 millimeters.
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