Method for automatic material interchange in urgent specification change of hot rolling production line

Abstract

The invention provides a method for automatic material interchange in urgent specification change of a hot rolling production line. When a three-level computer receives a second-level specification change telegraph text, virtual slabs which are not brought into a rolling mill operating plan yet and meet contract matching conditions are searched for interchange. Model constraint conditions include that the width and thickness of hot rolling materials are identical to the target width and target thickness of an order, actual steel codes of the slabs are identical to representative steel codes or nominal steel code of the order, the nominal width of the slabs minus the maximum side pressure quantity of the slabs is smaller than or equal to a target width value of a hot rolling procedure outlet, the nominal width of the slabs minus the minimum side pressure quantity of the slabs is larger than or equal to the target width value of the hot rolling procedure outlet, checking weight is larger than or equal to a minimum inlet piece weight and smaller than or equal to a maximum inlet piece weight, and solution can be worked out by translating matching between the contract and the slabs into a 0-1 knapsack problem. Using the method can improve operating efficiency, shorten delivery time for users, reduce overstocked products, quicken logistic circulation and reduce coil surplus and capital employment rate.

Description

technical field [0001] The invention belongs to the field of automatic control of steel rolling, and in particular relates to an automatic exchange and conversion method of materials used for emergency specification change of a hot rolling production line. Background technique [0002] In the production process, due to the influence of restrictive conditions such as production technology, specification group spacing, contract quantity, and roll change, the rolling line needs to change specifications urgently, thereby producing indefinite quantities of non-entrusted steel coils that do not belong to any contract. It is called unplanned steel coil. At present, the domestic hot rolling production line, as unplanned steel coils in the steel coil warehouse, is manually operated by the contractor according to the shortage of the contract, so as to realize the exchange and conversion. In actual operation, due to many matching conditions, the comparison work is cumbersome, the work...

AI Technical Summary

Problems solved by technology

In actual operation, due to many matching conditions, the comparison work is cumbersome, the work efficiency is low, and the accuracy is poor

And due to the time difference of the operation, the matching contract can be included in the rolling plan to arrange production or production completion, so it will cause repeated production

If these steel coils are not processed in time, it will occupy a large number of warehouses, increase the inventory, cause a backlog of funds, and affect the turnover of funds