The problem of developing a calculation-experimental method for calculating wear of a sliding bearing based on a two-factor wear model (contact pressure - sliding velocity) with identification of wear resistance parameters was considered. On the basis of the proposed wear model, the wear-contact problem for a cylindrical sliding bearing was solved. The equation of equilibrium for medium pressures and the approximating function of linear wear from the arc of contact between the shaft and the bushing were used as the determining equations. To identify parameters of wear resistance in the wear model, a calculation-experimental method for determining calculated dependences of wear resistance parameters was developed on the basis of the wear test by the «cone – three balls» scheme. The results of wear tests of bronze conical specimens with a variable wear spot and two values of sliding velocity were taken as a base. The obtained results were recommended for predicting wear of sliding bearings at the design stage and optimizing their design and operational parameters.

Study and development of the technology for hardening rope blocks by reeling

The study proposes the form of the wear law for two factors, contact pressure and sliding speed, taking into account the properties of lubricants and struc

The article provides a review of information materials on the effectiveness of surface plastic deformation in order to increase the wear resistance of friction pairs. The analysis revealed that the increase in the wear resistance of parts by surface plastic deformation is significantly affected by the stabilization of the rolling forces, as well as the values of the optimal modes of rolling parts by rollers В статье приведен обзор информационных материалов по эффективности применения поверхностного пластического деформирования с целью повышения износостойкости пар трения. При анализе было выявлено, что на повышение износостойкости деталей поверхностным пластическим деформированием в значительной степени влияют стабилизация усилия обкатывания, а также значения оптимальных режимов обкатывания деталей роликами В статье приведен обзор информационных материалов по эффективности применения поверхностного пластического деформирования с целью повышения износостойкости пар трения. При анализе было выявлено, что на повышение износостойкости деталей поверхностным пластическим деформированием в значительной степени влияют стабилизация усилия обкатывания, а также значения оптимальных режимов обкатывания деталей роликами

This article presents the results of experimental studies on the rolling of parts that are subject to wear and tear by rollers. The physical and mechanical

The work scientifically substantiates the application of effective technology for the restoration of worn car parts by applying new electrospark coatings based on electroerosion nanomaterials. The developed technology is characterized by technological flexibility, cheapness, simplicity, does not require the use of expensive and scarce materials and equipment, and also meets the requirements of environmental safety. The proposed technology can be used to restore a wide range of parts for cars, tractors and other machines. Experimentally established dependences of the effect of the properties of electroerosive materials on the properties of electrospark coatings of restored car parts. It is shown that the content of nano-sized particles in the electrode material contributes to the improvement of the physical and mechanical properties of electrospark coatings. The dependences of the influence of the properties of electrospark coatings on the resource of restored car parts were experimentally established. It is shown that the resource of the shafts of turbocompressors restored according to the recommended technology is higher than the resource of new shafts by an average of 1.5 times. Experimentally established rational modes of applying wear-resistant coatings to worn shafts of turbocompressors, which provide the necessary complex of physical and mechanical properties of the coating and the given resource of the shafts as a whole (rotation frequency of the part, min - 1 - 50; electrode feed, mm/min - 0.4 ... 0.5). The characteristics of wear resistance of electrospark coatings of turbocompressor shafts, obtained using electroerosion nanomaterials, were studied. It is shown that the average value of the coefficient of friction of the electrospark coating was 0.146 instead of 0.486 without coating, which is 3.3 times lower. According to the results of production tests, it was found that the duration of operation of the turbocharger, with the restored method of electrospark treatment with a nanostructured electrode shaft, increased by 2.1 times compared to a new industrially manufactured shaft. Thus, when abrasive material containing a fraction of 0.1...0.4 mm was introduced, the operating time of the turbocompressor with a restored shaft was 12.8 hours, and the operating time of the turbocompressor with a new shaft without wear of the nominal size was 8.1 hours.