Виконані дослідження глибини, ступеня наклепування і дифузії хімічних елементів поверхневого шару. Основним механізмом дифузії є градієнт щільності дислокацій. Досліджено процес зношування контактних поверхонь тертя при коченні з врахуванням проковзування. Запропоновані спосіб, тех нологія і пристрій для обкатування канат них блоків клиновим роликом, які забезпе чують низьку шорсткість і високий ступінь наклепування поверхні Ключові слова: контактна міцність, зно шування, поверхневе пластичне деформу вання, клиновий ролик, канатний блок Выполнены исследования глубины, сте пени наклепа и диффузии химических эле ментов поверхностного слоя. Основным механизмом диффузии является градиент плотности дислокаций. Исследован процесс износа контактных поверхностей трения при качении с учетом проскальзывания. Предложены способ, технология и устрой ство для обкатывания канатных блоков клиновым роликом, которые обеспечивают низкую шероховатость и высокую степень наклепывания поверхности Ключевые слова: контактная прочность, износ, поверхностное пластическое дефор мирование, клиновой ролик, канатный блок
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.
The article presents the results of a study of the contact strength of V-belt pulleys when they work on contact collapse. To increase the wear resistance and contact strength of the tribological conjugation, a method for rolling around the side surfaces of pulleys with a roller and a device for its implementation are proposed. The proposed method and device can increase the wear resistance of the pulleys, and hence the durability of 1.6 ... 2.1 times.
The article discusses the method of surface plastic deformation of steel parts by smoothing. The positive influence of this method on the wear resistance of the tool has been established under conditions of intense wear and with abundant lubrication
The physical mechanisms have been investigated that form and transform the corpuscular-vortex-wave thermal complexes of disturbances in contact tribosystems based on the quantum-mechanical exchange interaction. The presence of a contact gap determines the generation of pairs of quasi-particles-disturbances stabilized by wavelength and frequency. Internal instability and collapse processes in such a system of disturbances lead to the formation of defects in a tribopair's material and underlie the emergency friction regimes. This paper gives specific technical examples of the generation of thermal complexes at fretting, during the friction of sliding and rolling, and at cutting. It has been established that the destructive nature of the process of fretting at low values of reverse sliding speeds is caused by the generation and collapse of the corpuscular-vortex-wave thermal complexes. An example of acoustic friction emission in the ultrasonic region of the spectrum has been used to show the quantum nature of the disturbances generated by friction. The high-frequency spectrum of acoustic emission corresponds to the unbalanced composition of the disturbances and leads to the formation of wear particles. The exchange interaction in a tribosystem involving rolling on the plane has been considered. The results of statistical analysis of such rolling showed the existence of the effect of negative friction caused by the quantum generation of longwave disturbances. It has been demonstrated that the collapsed component of the generation of disturbances is significantly increased under the modes of materials destruction, including when cutting the materials. The corpuscular-vortex-wave mechanism of selective transfer and hydrogen wear in tribosystems has been described. It is shown that the properties of a servovite film under the mode of selective transfer are provided by the collapse processes in the system of disturbances. Similar processes at the vortex-wave transfer of hydrogen atoms in metals lead to the wear and destruction of the surface layer of friction
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