Abstract
The dependence of the technological system state of repair equipment during its operation on the quality of repair of machine parts is revealed. The authors proposed a method to determine the quality of processing of repair parts, including ones of transfer function of the movable friction unit along the sliding guides of the metal-cutting machine under conditions of semi-fluid (mixed) friction in the form of an equivalent oscillatory link. The method is based on the integrated method for calculating and determining the technical state of a typical repair equipment based on the proposed integral criterion for the assessment of its vibration resistance. Using the theoretical developments and experimental data, the transfer functions of the machine support system for various designs were determined. The proposed complex method to calculate and determine the technical state of standard repair equipment will make it possible to develop new design solutions and re-equip the existing machine park of repair enterprises in agro-industrial complex.
Highlights
Modern agricultural machinery is a very high-technology product
In order to achieve a high quality of repair of equipment, the system of repair can be considered as a single integral criterion that can be used to synthesize and optimize technological systems by comparing output
The calculation of natural frequencies and vibration modes is carried out and the calculation of the frequency characteristics of an elastic system is performed taking into account damping at the second stage, revealing the nature changes in natural vibration modes. They propose to use a systematic approach to the design of machine tool layouts. It is a computational technique in which an elastic system is schematized with the help of so-called superelements subjected to automatic reduction in a limited frequency range during the formation of matrices of a mathematical model, which significantly reduces the time for the calculation of dynamic characteristics
Summary
Modern agricultural machinery is a very high-technology product. Its repair at a high professional level and quality is a laborious and difficult task. In connection with the above-mentioned problem, there is the task to create new repair equipment or modernize existing one, including precision machines, corresponding in their technical level to foreign ones The solution to this problem requires further research in the field of machine tool dynamics, the methods for the calculation and assessment of the dynamic state and subsequent optimization of dynamic characteristics for a number of limiting factors. The modern trend in the development of machine tools, due to the continuously increasing requirements for them, is accompanied by a constant increase in the rotational speed of the main movement up to 4000-6000 rpm, the operating and idle run rates up to 0.5-3.0 and 10-20 m / min, respectively, by reducing the acceleration and deceleration time of the operating elements to 0.02 s at high requirements for the accuracy and roughness of the surfaces of the workpieces, etc In this regard, the issues of further research of vibrations in machine tools are of particular importance. Thereby, this aspect highlights the need to improve the performance of repair equipment and achieve their optimal dynamic characteristics
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