Development of situation models for duration of production cycles of manufacturing finished rolled products. Message 1

Abstract

The problems of system analysis and development of a complex set of models necessary for constructing an algorithm for situational (multivariant) estimation of the duration of production of different batches of rolled products in the conditions of a modern automated medium-sized shop (object of study), including rigidly connected production sections with continuous and cyclic technological processes (feeding blanks, heating in method furnaces, rolling, cutting the rolled stock into strips, cooling, trimming the ends of the bundles of rolled stock, cutting to cut lengths, forming and tying bundles of finished rolled products, loading bundles into railway cars). The study of the functioning of the rolling shop was carried out in the following order: the study of technological processes; technical characteristics of the main and auxiliary equipment; analysis of technical and economic indicators; performance of chronometric and monitoring observations of the metal flow, the operation of units and equipment; decomposition of the production process into operations, elements and trace elements; analysis of the influence of the human factor in the organization of production and operational management of processes; analysis of expert assessments of real and possible production situations related to the fulfillment of orders for finished products. The duration of production cycles is proposed to be classified as follows: piece (corresponding to a workpiece, a pack of workpieces, a package of finished rolled products); batch (corresponding to the shipment of products); subsystem and system (related to sections, departments, workshop as a whole); technically possible, normative, planned, predictive and actual. Based on the preliminary development of situational batch models of the duration of production cycles of the departments of the shop, a situational system model of the duration of the production cycle for manufacturing a batch of finished rolled products is determined by selecting the models of the unit with the maximum cycle duration. To bring the duration of the production cycles of subsystems and the system as a whole into a comparable form, the quantitative characteristics of rolled products batches are determined. Mathematical models of the duration of the production cycle of the warehouse of blanks are built; technological line. The clock models of work of the warehouse of blanks, the production line, the warehouse of finished products have been formed.