Друковані видання. Кафедра агроінженерії та автомобільного транспорту

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Browsing Друковані видання. Кафедра агроінженерії та автомобільного транспорту by Author "Dudnikov, A. A."

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    Effect of vibration treatment on increasing the durability of tillage equipment working bodies
    (Eastern-European Journal of Enterprise Technologies, 2021-04-20) Dudnikov, A. A.; Ivankova, O. V. ; Gorbenko, O. V. ; Kelemesh, A. O. ; Дудніков, Анатолій Андрійович; Горбенко, Олександр Вікторович; Келемеш, Антон Олександрович; Іванкова, Олена Володимирівна
    This paper reports a study into the durability of tillage equipment working bodies. It has been established that the quality of surface layers during plastic deformation depends on a series of factors. These factors include the degree of hardening, the thickness of the hardened layer, the size and nature of the distribution of residual stresses. The study has shown that the technology to restore working bodies that involves vibration oscillations provides for higher durability. Investigation of deformed samples demonstrates that when exposed to vibration treatment, the microstructure is more fine-grained and even; the hardness of the treated surface of a ploughshare blade increases by 22‒35 %. This contributes to hardening the machined surface. It has been established that the tillage equipment working body wear is a random process, which is predetermined by changes in the structural dimensions and shape of cutting elements. An analysis of the wear distribution density of cutting elements has revealed its compliance with the law of normal distribution. It should be noted that the most influential geometric parameter of a working body affecting the part’s resource is the wear depth. This parameter determines the residual thickness of the ploughshare wall. Data from surface-layer studies at hardening make it possible to note a decrease in the limiting state of the examined parameters. In particular, the wear of a ploughshare tip was 17 % less than the limiting state. The study of durability has shown that the amount of tillage equipment working body wear is 1.28 times less when using vibrational plastic deformation. Accordingly, when restoring ploughshares, in order to increase the working bodies’ resource, it is more expedient to use a method that implies the welding of tires made from steel 45 involving sormite surfacing and vibration treatment.
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    Improving the technological process of restoring the tillage machine working parts
    (Eastern-European Journal of Enterprise Technologies, 2020-04-30) Dudnikov, A. A.; Gorbenko, O. V. ; Kelemesh, A. O. ; Drozhchana, O. U. ; Дудніков, Анатолій Андрійович; Горбенко, Олександр Вікторович; Келемеш, Антон Олександрович; Дрожчана, Ольга Урешівна
    An analysis of the wear of machine parts has made it possible to establish characteristic requirements for the technological process of restoring worn surfaces. Experimental studies on hardening the working surfaces of plowshares have made it possible to determine processing parameters: oscillation frequency of the processing tool of 1,400 min-1, the oscillation amplitude of 0.5 mm and processing time of 20 s. Studies of the influence of conventional and vibration working on strength characteristics were carried out first on models and then on actual parts. New shares served as models. Experimental studies of these shares provided the identity of the nature of the cutting element wear. The sameness of the model and the actual part deformation degree was provided by the same conditions of the passage of the hardening processes. The trustworthiness of the results of experimental studies was assessed in accordance with the law of theoretical distribution at a given value of confidence probability α=0.95. The studies have established that the share width of 116–117.5 mm which has a certain effect on the share efficiency corresponds to the highest probability of 0.39. It has been experimentally established that the degree of hardening of the shares made of L-53 steel and surfaced with sormite and vibration hardened is 1.85 times greater than in conventional processing. The studies have made it possible to determine the nature of change in the share shape and thickness of the cutting edge and choose a more efficient process of its restoration by vibration hardening. A method of recovering shares by welding strips of 45 steel with automatic hard surfacing and vibration hardening was proposed.