Multivariate estimation of production duration of steel wire batches on the basis of situational-regulatory models. Message 1

The article considers the tasks of system analysis and development of models required for the synthesis of a situational (multivariate) procedure for estimating the standard duration of manufacturing a batch of products within a multi-structural steel wire complex (object of study), including independently functioning units with continuous, semi-continuous and discrete technological processes (etching, drawing, annealing, copper plating), which are connected by a single material flow. The complex is distinguished by: a variety of technological routes, allowing to produce a wide range of products (steel wire), corresponding to different standards, steel grades, diameters, shapes and masses of finished products; multivariate specialization of drawing mills; flexible connections between departments; parallel, sequential and combined work of the main and auxiliary equipment; equipment by specialized vehicles (cranes, conveyors, transfer carts, electric vehicles). During the system analysis of the research object, the following issues were resolved: a number of technological routes in the branches of complex were identified and described, their characteristics were evaluated. Graphic models of production processes have been developed, displaying sequence and parallelism of operations, their decomposition into elements and microelements for each compartment. The determining factors were identified characterizing the organization of production processes for all departments. Regulatory models have been developed for the duration of operations based on the integration of various research methods. The solution of the above task is based on the clock approach and includes: building a factor model of the piece situational tact of the s-type drawing mill, “pickling bath-tap” subsystem, heat treatment furnace, and the copper plating line. Additionally, the concept of piece equivalent operation of equipment was introduced to bring to a comparable form with the strokes of coarse-drawing mills. To ensure the coordinated work of the coarse drawing department with other departments, an appropriate amount of pickling, thermal, fine drawing equipment and copper plating has been determined. Models of interconnected part-time steps of the work of previous and subsequent branches (in relation to the rough drawing department) are formed. The degree of work coordination was determined on the basis of comparison of the part-time work cycles of equipment and vehicles at the entrance and exit of each section. To do this, regulatory models of vehicle operation were pre-built. The results of the performed work allow us to proceed to the presentation of the algorithm itself for estimating production duration of batches of steel wire, which will be presented in the second message. 

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