EXPERIMENTAL STUDY OF CHANGES IN CUTTING FORCE DEPENDING ON SOIL DEVELOPMENT CONDITIONS

Abstract

For soil development, depending on the conditions and type of soil, machines with soil-developing working bodies of various  types are used: active, passive and passive-active. The most widespread are passive-type working bodies. The most significant component of the energy intensity of the working process of soil development by working bodies is the conditions of soil development by cutting elements. Experimental studies were conducted to determine the cutting forces in the conditions of blocked, semi-blocked, asymmetric blocked and free methods of soil development. The experiments were carried out on the soil channel of the Department of Construction, Road and Land Reclamation Machinery of the NUWEE. A comparative analysis of the convergence of experimental and theoretical research results for sandy-clay soil was carried out. The ratio between the values of soil cutting forces under different conditions of its development is determined. When developing hard sandy loam of category 1 with passive soil-developing tools to a depth of h=0.1 m with soil moisture ω=14% for the ratio b/h=0.25…1.0, the  relative cutting force during asymmetric blocked cutting is 110–150% of the blocked cutting force; during semi-blocked cutting – 50–70% of the blocked cutting force; during free cutting – 40–55% of the blocked cutting force. With an increase in the width of the cutting elements of the soil-developing tools, the influence of the ratio of the knife width b to the development depth h on the cutting force decreases.