| Summary: | The work is devoted to the main tillage, namely the theoretical substantiation of the profile of a flat-cutting working body of a plough. The article has a research character, which is expressed in the fact that the theoretical analysis of the method of determining the angle of sharpening of soil–processing working bodies according to the degree of gradual wear of working bodies were shown in works on this problem. There was also substantiated the type of the proposed design, there were given its description and flow of a technological process. As a result of the work done, there were obtained the theoretical dependence of the sharpening angle of working bodies and influence of the degree of wear on traction resistance of an arable unit. The conclusions set out the main results achieved so far.
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