Experimental determination of field microrelief ridgenessness after secondary tillage with Stepnyak 7.4 cultivator

Four wheels are installed on the frame in the front part, the rear part of the frame is supported by two rows of rollers to ensure stable operation of the Stepnyak-7.4 cultivator in depth and maintain the required ridgeness of the soil field. The speed of movement of the unit, the depth and the running uniformity of working tools, and the traction resistance of the machine depend on the ridgeness and microrelief of the field. A priori ranking of factors of the cultivator’s operation revealed that the most significant factors in studying the ridgeness of the cultivated soil are the speed of movement of the unit V a , the diameter of the rolling basket drum Drb and the setting angle of the scraper γ. The variation levels of natural factors are established and values of coded values of factors are calculated. An orthogonal central composite design was used to design the experiments. Based on the results of experimental data processing, a mathematical model of field ridgeness variation after processing depending on the varied factors is obtained, and rational ranges of operational parameters are determined. The studies revealed that the minimum ridgeness of the field soil is achieved with a rolling basket diameter of 0.40-0.45 m and an inclination angle of the scraper bend of 75-80 degrees with a unit speed ranging from 2.8 to 3.2 m/s.