Journal of Machinery Manufacture and Reliability最新文献

This article is devoted to analysis of the configuration, control methods, and functionality of the servo drive system, using the example of the FANUC CNC. Primary attention is paid to the methods of control of servomotors; control schemes for the CNC system of semi-closed and closed circuits, closed loop with double position feedback, have been developed. The main functions of the connectors of servo amplifiers of the ALPHA i, Dis Series Built-In types are described.

The results of a series of experiments aimed at studying oscillatory and dynamic processes in a backlash-free gear engagement are presented. The causes of oscillatory processes in gear engagements are considered. The parameters of oscillatory processes (vibration velocity and vibration displacement) are measured during the electric spindle and backlash-free gear engagement rotations with different values of the axial tension. The machine tool electric spindle deformation values and the change during axial movement of the wheels are determined.

The article is devoted to the development of an original approach to determining the value of the surface energy of metals and products made from them. A method has been developed for determining the value of surface energy based on measuring the contact potential difference, taking into account the surface hardness of the metal being studied. A machine learning model has been developed that allows the gradient boosting method to calculate the value of the surface energy. A practical example shows the application of the developed method for determining the value of the surface energy of parts made of structural and tool steels and alloys.

Laser shock peening of materials, focusing on the effect of various laser parameters (power density, laser spot radius, and overlapping coefficient) on the mechanical response of the material (compressive residual stresses, the occurrence depth, surface plastic deformation, and roughness), was studied. This study, conducted using linear regression analysis, was conducted on the V95 aluminum alloy. The optimization of laser parameters is shown to provide both the deepest layers of compressive residual stresses and the smallest surface plastic deformation and roughness.

A tribodynamic approach is used to study the causes of failures of electric submersible vane pump filters. Test benches are developed on which the amplitude–frequency characteristics of the filter assembly and the bearing support shaft are obtained. The main cause of bearing failure is identified as being in the operating frequency range of the second harmonic of natural oscillations and causing impacts of the bearing bushings during their edge contact due to shaft bending with a vibration acceleration of up to 30 m/s². During the experiments, damage to the bearings is obtained during operation in the near-resonant zone. Shaft failure is due to the interaction of fragments of the destroyed bearing with the shaft surface. The results are useful for designing a tribodynamic system and analyzing failure causes.

The task of automating the process of quality inspection of the fit of a small gear onto the shaft of a locomotive traction motor during the assembly of wheel-motor units by applying axial force during repair work is addressed. The necessity of automating this quality inspection process for the fit of a small gear onto the shaft of a locomotive traction motor is substantiated. A description of an automation system for measuring and recording for this inspection is provided, and its main functions are reviewed. The control program for the information-recording complex of the automated quality inspection device is described, and its operational algorithm is presented.

Vibration processes and machines are widely used in various industries. This article considers the development of an elastic suspension of the working element of a single-mass vibration machine with two inertial self-synchronizing vibration exciters, equipped with an automatic resonant adjustment system with changing process load mass. The requirements for the elastic suspension of the considered class of machines are formulated. The parameters of the elastic suspension are calculated, and the design scheme is developed. The proposed design ensures a fairly wide range of possible adjustment of the rotation speed of the eccentric weight near the first resonant frequency and stable antiphase self-synchronization of the vibration exciter eccentric weights.

The activation energy of the surface of materials is considered in the context of collision theory. The necessary condition for the efficiency of collisions consists in the fact that the collision energy satisfies the conditions. Theoretical approaches to the studies on the mechanisms of the temperature effect exerted on the reaction rate are considered.

In the framework of this study, a comparative analysis of the experimental data and of the results of other authors obtained using various technologies of mechanical pressure treatment was carried out.

A new solution for creating machines and devices that convert the energy of solid explosive charges into useful work with a controlled frequency and high thermodynamic efficiency and power is the use of disposable combined reflectors that are destroyed after the accumulation and flow of explosion products from them into the environment with minimal losses. To increase the efficiency of energy conversion in reflectors, a new method was proposed that allows studying the modes of their effective destruction.