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22RESEARCH OF MECHANICAL PROCESSING PROCESS ON THE BASIS OF MODERN METHODS OF MEASUREMENT AND CONTROL
Sardorxo'ja Doniyorxo'ja o'g'li Rustam Jaxongir o'g'li Karimov
Mirzaxo'jaev
Fergana Polytechnic Institute ABSTRACT
The building materials industry uses a variety of large-sized machinery and equipment. Along with the creation of new units, there is a continuous improvement and change of existing ones. The most important factor in increasing the efficiency of large-sized bodies of revolution is their reliability, which largely depends on the quality of installation work, timely preventive and repair maintenance.
Keywords: measurement and control, mechanical processing process, modern methods
The most short-lived, but the most critical part of the cement kiln is its support units. The presence of initial defects in them, as well as the action of excessive loads, lead to deviations in the operation of the cement kiln from the nominal modes, up to stopping it for repair work. The cost of repairing the support units is commensurate with the cost new support nodes.
Purpose of the work: development of scientifically based technological methods of periodic individual processing of large-sized parts to restore the geometric accuracy of their base surfaces during operation without dismantling using built-in portable machine modules and methods of active control of shape parameters during processing.
It is proposed to approximate the contour of the band in cross section with circular arcs. This approach makes it possible to determine a closed contour with sufficient accuracy provided that the lengths of the circular arcs approximating the real contour are correctly selected.
Figure 1 shows the approximation of circular arcs a) a contour of an arbitrary shape, provided that each starting point of the next arc coincides with the midpoint of the previous arc, the way of conjugation of arcs with overlap, b) a section of the contour of a closed shape.
Using the method of approximation by arcs with overlapping, allows you to derive mathematical relationships to obtain a parametric model of the section. Fig. 2 shows the design scheme for determining the mathematical relationships.
Fig.1. Approximation of a closed contour by circular arcs.
As it was established in the course of the study of the restoration processing of large-sized parts having the shape of bodies of revolution, the main parameter that determines the required operability of the unit is the given roundness of the shape of the tires and support rollers in the cross section.
To study the change in the shape parameters of the band in the process of multipass restorative treatment, the cross-sectional shape was simulated at various deviations from the roundness (Fig. 2), as well as its change with the step-by-step approach of the cross-sectional shape to the shape of a circle.
Fig.2. Parametric section models with different deviations from the circularity of the
cross-sectional profile.
In the course of modeling, the analysis of the change in the section parameters was carried out during the implementation of the process of step-by-step approximation of the shape to the circle. Based on the measurement results for the arbitrary contour, a sweep of the radii along the sections was constructed.
The analysis of the results revealed a pattern in the change in the section parameters. It can be seen from the diagrams that with a step-by-step correction of the shape of the cross-section as it approaches the shape of a circle, the values of the radii of the approximating arcs Rt at all points are leveled, the value of the average value from all radii Rcp approaches the value of the radius of the inscribed circle.
Fig.3. Modeling results of section shaping.
Main results of work and conclusions
1 In the work, regularities are established and parameters are determined that characterize the change in the geometric shape of the cross-section of a large-sized part during multi-pass recovery processing
2 A new method for measuring the geometric parameters of large-sized parts of rotation without a stationary axis of rotation has been developed and experimentally tested, which makes it possible to determine the change in the parameters of the geometric shape during the recovery processing
3 A method has been developed for determining the deviations of the shape of the band, which makes it possible to establish the limiting dimensions of the section and the allowance required for restoration processing.
4. Developed a new modular technology for processing, based on the use of methods of active control of the geometric shape in multi-pass processing.
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