Changing the Loading Conditions of the Blade of a Soil Processing Machine during Abrasive Wear
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ging the Loading Conditions of the Blade of a Soil Processing Machine during Abrasive Wear V. I. Myalenko* Kuzbass State Agricultural Academy, Kemerovo, 650056 Russia *e-mail: [email protected] Received March 2, 2020; revised July 5, 2020; accepted July 7, 2020
Abstract—Any work of soil-processing machines is accompanied by abrasive wear of working bodies and, first of all, their blades with the characteristic formation of rear chamfers on them. The use of methods and bench equipment for accelerated simulation loads in this study allowed us to determine the areas of normal pressure plots on the friction surfaces and predict the consequences of wear results. It was found that an increase in the angle of the rear chamfer as a result of wear increases the area of the plots of normal pressure on the blades, while increasing the energy consumption and reducing the quality of work. The research results obtained in this paper are proposed to be used in the development of new designs of working bodies of soil-processing machines. Keywords: accelerated simulation tests, normal pressure diagrams, friction surfaces DOI: 10.3103/S106836662005013X
INTRODUCTION The execution of the technological process by soilworking machines is accompanied by abrasive wear of their working bodies. The blades of the working bodies are knives of bulldozers, various teeth of cultivators, and plowshares of plows, carry out the initial introduction and separation of soil during work and perceive the greatest force loading while undergoing intense abrasive wear. The abrasive solids in the soil abrade the friction surface of the blade, changing its original shape and size [1]. Moreover, the fact of the loss of a certain amount of metal from the surface of the blade during wear is not always the root cause during rejection and replacement of worn parts. More often culling is done much earlier. Depending on the properties of the treated soils and the design features of the blades, sometimes with slight wear, a quick dulling of the blade occurs, which prevents further quality assurance of the technological operations of the soilprocessing machine. The nature of blunting and the very shape of a blunted blade is reduced, as a rule, to a slight rounding of the edge of the blade and the formation of a rear chamfer on the back of the blade [2]. This characteristic shape of a blunted blade significantly changes the force loading of the working bodies of soil-processing machines during subsequent work. The rear chamfer itself can be located parallel to the direction of movement of the blade in the soil, but more often at a different angle of this direction with an
inclination towards the lower untreated part of the soil [2, 3] This circumstance, associated with such a phenomenon as the formation of a rear chamfer during wear of the blades, is important to consider when repairing and designing new working bodies of soilprocessing machines [4]. Aim of this study: to establish the patterns of change in the loading conditions of the blades of soil-processing mach
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