Design and Stress Analysis of Type-Disk Rotary Blades for Portable Cultivator

Abstract A disc-type rotary blade is a type of cultivator blade used for tillage on a small plot of land. Due to its small design, fast manufacturing process, and low production cost, the disk-type rotary blade was ideal for use in cultivator packages. The design of disk-type rotary blade for cultivator packs is presented in this work, along with structural strength analysis. This research aimed to come up with a cultivator blade design that was lighter and cheaper to produce. The research method used is to use the finite element method to analyze the strength of the structure. This analysis yields a stress, deformation, and safety factor distribution assuming a load of 160 N calculated from the average soil-specific gravity and disc-type rotary blade volume. The safety factor reveals that this disc-type rotary bar is quite safe, with the lowest value in the notch region valued at 3. The values of stress and deformation in this region of the disk are displacements of 6 MPa and 0, respectively. This is due to the box-shaped reinforcement designed to strengthen the rigidity of the disk, preventing it from being easily plastically deformed. The greatest pressure and deformation of the disk-type rotary blades when on the blades averages 87 MPa, and the displacement is 2.4 mm. As a result, the blade had to be strengthened so that there was no excessive deformation while the portable cultivator was being operated.