Studies in coatings for working bodies of deep-rippers recovered by plasma surfacing
2019
Shakhov, V., Orenburg State Agrarian Univ. (Russian Federation) | Ivanovs, S., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Uchkin, P., Orenburg State Agrarian Univ. (Russian Federation) | Ushakov, Yu., Orenburg State Agrarian Univ. (Russian Federation)
Abrasive soil particles affect the working bodies of tillage machines and cause their wear-out, due to which the agrotechnical parameters of soil cultivation are being disturbed. The use of innovative restoration technologies makes it possible to increase the resource of the deep-ripper working bodies. One of such methods is plasma surfacing, which is now widely applied in the above working bodies repair. However, to obtain high-quality surfaces, it is necessary to study the process of layer formation and establish optimal modes of the coat application as well as the most efficient materials, among which tungsten carbide is most commonly used. To find out the best performance of the surfacing process, the laboratory studies of samples, having been coated by means of the plasma method, and production tests of the deep-ripper chisels, restored in specified modes, have been carried out. As a result of the experiments conducted, the most expedient parameters of plasma surfacing of the deep-ripper chisels, i.e.: working voltage – 35 V, deposition rate – 4.5 m•hE–1, content of powders in the mixture (tungsten carbide + PG-S27) – 50 to 50 % by volume, have been determined. Using these modes, the surface layer with a hardness of about 70 HRC and wear resistance, exceeding that of a new working body up to 5 times, can be obtained. The conducted studies allow us to recommend this method of restoration of the working bodies of deep-rippers for use by enterprises engaged in the repair of tillage equipment.
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