Abstract
We have studied technological processes related to the restoration of worn-out parts of agricultural machinery (plowshares, cultivator sweeps) that operate under conditions of intensive abrasive wear. We have determined the influence of operating parameters of the technological process on the quality of the restored surface of the cutting elements of machines’ working bodies under conditions of regular and vibration deformation. It was noted that the restoration technologies based on vibratory oscillations make it possible to create new machining methods characterized by higher intensity: the physical-mechanical properties of the recovered parts’ material, their shape and dimensions, as well as machining regimes. We have performed a strain gauge study of changes in the parameters of cutting elements in the working bodies of tillage machines, which made it possible to determine the magnitude of deformation when parts are machined. We have constructed a mathematical model of the dynamics of abrasive wear of the above-specified working bodies, which allowed us to define the patterns in the wear intensity distribution of a working body’s cutting element. Based on the derived curves of density distribution of wear magnitudes for cutting elements in the specified parts, we have defined a wear law that revealed patterns of change in the strained-stressed state of the working surface in a cutting element. We have estimated the influence of basic factors on the processes occurring in the material of parts during operation. The main factors for vibration machining of the parts’ working surface have been established: the amplitude, frequency of oscillations of a machining tool, the time of hardening. The criteria for the threshold condition of parts under conditions of abrasive wear have been defined: the thickness of edge of the cutting element of parts and a change in size. We have established the positive role of compressive stresses when machining the parts’ material in their wear-resistance improvement. A dependence of the magnitude of parts’ wear on the following key factors has been established: their material, restoration technique, operation duration. It has been proven that the use of vibratory oscillations of the machining working body reduces the intensity of wear of parts in tillage machinery, which is important and relevant to improving the reliability of agricultural machines
Highlights
Application of effective technological processes, both in the manufacture of new parts and when restoring the wornout ones, contributes to improving the strength of their contacting surfaces and, durability and reliability.Changes in the qualitative characteristics of technolo gical processes related to the operation of modern machines present challenges to the repair service as they imply im proving their resource
The intensity of wear of plowshares, at amplitude A = 0.5 mm, frequency n = 1,400 min-1 of oscillations of the machining tool, and treatment duration t = 20 s, restored in line with a given technology, is 1.42 times lower compared to new plowshares
The data acquired from the results of our study, the amplitude, duration, and the number of oscillations of the machining tool, allow their application when developing technological operations aimed at restoring other parts of tillage machinery
Summary
Application of effective technological processes, both in the manufacture of new parts and when restoring the wornout ones, contributes to improving the strength of their contacting surfaces and, durability and reliability.Changes in the qualitative characteristics of technolo gical processes related to the operation of modern machines present challenges to the repair service as they imply im proving their resource. Application of effective technological processes, both in the manufacture of new parts and when restoring the wornout ones, contributes to improving the strength of their contacting surfaces and, durability and reliability. Improving the durability of parts is a set of tasks: the use of materials with the required physical and mechanical properties; the use of efficient technologies in manufacture and restoration of parts; optimal operating modes, etc. The reliability of agricultural machines is typically determined by the durability of pairs at friction. In this regard, it is an important issue to conduct a research aimed at searching for effective technologies of strengthening the surface of layers of parts in contact
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More From: Eastern-European Journal of Enterprise Technologies
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