International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Natural gas serves as the primary energy source for heating slabs in the Pusher Furnace prior to their rolling into steel plates. The required quantity of natural gas for a 24-hour operational period must be estimated in advance. This study employs multifactor regression analysis to develop a straightforward yet effective predictive equation for natural gas consumption, incorporating key variables such as projected production, the number of slabs to be heated, effective operating time, and the average dimensions of the slabs over a 24-hour workday. Extensive data collected over an extended period formed the matrix for determining the regression coefficients. The resulting model demonstrates a high correlation coefficient (R² = 0.99), underscoring the accuracy of the regression equation. This indicates that the model reliably predicts natural gas consumption with minimal deviation from actual usage during a 24-hour workday.

The hardness of iron-nickel coatings during the restoration of worn parts is an important factor determining the service life of machines. This mechanical property depends on many factors, the simultaneous influence of which cannot be taken into account in conventional experiments. Therefore, we have made an attempt to simultaneously use the complex methods of similarity theories and planning multifactorial experiments to study the hardness of iron-nickel coatings. The composition of the electrolyte was obtained by us with a copyright certificate for the invention No. 700568, Moscow, 1989, Katsitadze J.V.,. Kikabidze D . N . “Electrolyte for obtaining plated iron-nickel alloy”. This approach to the issue allows taking into account the simultaneous influence of a large number of factors on the optimization parameter, obtaining reliable and reasonable results in the form of regression equations, optimizing the process of restoring machine parts with an iron-nickel electrolytic alloy and generalizing the results obtained.
In the article, the influence of technological similarity criteria on the hardness of iron-nickel coatings is explored, the response function is obtained depending on the dimensionless similarity criteria and the corresponding mathematical model is used to carry out targeted experiments according to the Box-Benkin plan. As a result of mathematical processing of the obtained data, an adequate regression equation was derived, according to which the optimal electrolyte composition and electrolysis conditions have been

The basic features of calculating the reliability of agricultural machinery are shown, in contrast to industries such as mechanical engineering, radio and television equipment, automation systems and etc., in which machines and apparatus operate in steady modes, while agricultural machines do in difficult soil and climatic and dynamic conditions.

Еconomic aspect of reliability is substantiated and patterns of change in the efficiency of use of agricultural machinery in time are established, the economic parameters of reliability are determined. With the help of the theory of similarity and dimensions as well as the planning of multifactor experiments, through the original installation manufactured by us, the basic physical and mechanical properties of metal coatings are studied, obtained by welding under flux, there are relevant similarity criteria determined that characterize the process of restoration of worn parts and, after processing of experimental data an analytical view of criterion equation is formed and rational modes of the restoration of parts under submerged arc welding are set. Further, to optimize the process, the scheduling theory of extreme experiments has been used and as factors in the regression equation there have been chosen most significant similarity criteria. In methodics elaborated by us, it was obtained an adequate equation and by a method of steep ascent (movement along the gradient), there were determined optimal modes of recovery for metal coatings with high physical and mechanical properties (hardness, wear resistance).

Under these regimes there were recovered worn ploughshares and their operational check showed an increase of resource as many as 1.4…1.5 times. For surfacing worn parts with complex configurations (ploughshare plows, cultivators paws), we have manufactured a special copier allowing to recover the items automatically, in a continuous mode. The feasibility study of the developed resource-saving innovative technology has shown that the restoration of 800 ploughshares provides an yearly economic effect of EURO 1,462.

The paper considers the issues of qualimetric assessment of quality of reinforced steel. The dependences of the rate group of the mechanical properties from room profile. Built a regression equation characterizing the effects of deformation processing on the quality of rebar.