Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"Yedilkhan AMIRGALIYEV"

Vibroabrasive machining of large-size products on hydropulse drive machines DOI:10.15199/48.2019.04.07

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Depuration of outer as well as inner surfaces of complex shape items from forge scales, corrosion, scum as well as processing these surfaces prior to coating by physical and chemical method or paint has been a pressing issue for the enterprises. The present day production faces such difficulties when preparing gas and oil pipes for installation, manufacturing hydraulic power cylinders and turntable-type bearing using low quality pipes, further mechanical processing of which requires expensive tools or ecologically hazardous methods of chemical refinement [2, 3]. Vibroabrasive machining is the most efficient method for depuration of long-length (> 2 meter length) large diameter tubes (> 120 mm). The known plane vibration item load, which is used by the most types of vibratory equipment is not efficient enough when processing large machine parts with complex surfaces. The most technologically advanced equipment for vibroabrasive machining of large machine parts is hydro-pulse drive machine (HPD), which ensures a complex space mode of vibration load. Vibration machines with hydro-pulse drive have a simple system for adjusting frequency and amplitude of oscillation of movable objects as well as energy of one working stroke in each direction of vibration load. Vibration machines hydro-pulse drive of complex space load may be built according to the control circuit for the actuating hydrocylnders by one or more pressure pulse generator (PPG). PPG may be connected to the actuating hydrocylnders “to the input", “to the output", or “combined" [5]. From the point of view of design simplicity, the interest attracts the hydro pulse drive vibromachine of a complex space load with one PPG, switched to the actuating hydrocylnders “to the output". The dynamic model applied When developing the hydropulse drive for the vibromachine of the complex space load, with an aim to receive the highest probable frequency of p[...]

Generator modes for technological installations with variable parameters of the oscillating circuit DOI:10.15199/48.2019.04.33

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In technological installations for ultrasonic machining (USM), piezoelectric and magnetostrictive transducers (PET and SME) of electric oscillations are used in mechanical deformation of the medium with processed products as executive bodies in various technological processes. To generate electric oscillations, specialized generators (inverters) are used. Technical characteristics and operating modes of this generator are subject to special requirements. Generally, the PET is a package of piezoceramic washers with a diameter of 20 to 120 mm and a thickness of 3 to 10 mm, reinforced with metal straps. When the piezo packet is generated by electric oscillations due to the secondary piezoelectric effect, its bends occur and mechanical oscillations arise [1]. For example, in engineering technologies where ultrasonic treatment is applied, a variety of operations can be performed. Such as:  Cleaning and washing products,  Cutting, microwelding, brazing,  Shaping of parts from hard or brittle materials,  Hardening of the cutting tool,  Actuation of a percussion instrument. In technological installations, especially where percussion impacts on the tool are used, there is a sharp change of the load PET. This affects the generator operating modes. It is known [2,3] that piezoceramics possess a very high electromechanical Q-factor and its resonance characteristic is very sharp, so if the frequencies of the feeding generator and the instrument do not coincide, emergency regimes may arise. In this case, the generator will operate in modes from idle to short circuit, which is accompanied by the occurrence of either over voltages or over currents in the circuit. Formulation of the problem On the assumption of the foregoing, it is possible to determine a number of requirements for supplying PET generators capable of operating both on a regular basis and in emergency conditions:  Sinusoid[...]

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