DETERMINATION OF THE NUMBER OF ELLIPTICAL CUTTING BLADES OF A ROTARY WORKING ELEMENT

Abstract

An active rotary working element with an approach angle was studied. The elliptical cutting blades of the working element are deflected from the rotation plane. The experiment confirmed that the blades form a groove in the shape of a segment of an ellipse in cross-section, and a parallelogram when viewed from above. The bottom of the furrow contains ridges. It was established that the ridge height should not exceed 1/2 of the processing depth. The expression of the dependence of the central angle between adjacent elliptical cutting blades on the ridge height at the furrow bottom was formulated. The experiments were carried out using a physical model of the working element (scale 1:3). The approach angle was 40 degrees, the kinematic parameter was assumed to be equal to: 0.90; 1.20; 1.60; 2.20. The theoretical data are consistent with the data obtained from the experiment. The dependences of the number of elliptical cutting blades of the working element on the kinematic parameter and the approach angle of the working element were identified. It was found that increasing the approach angle and the kinematic parameter requires to reduce the number of blades. At an angle β = 40 °, λ = 0.90, c = 1/2 h, the number of elliptical cutting blades of the rotary working element should be 10-16 pieces.