A Hot Rolling Scheduling Method for Compact Hot Strip Production

Abstract

The invention discloses a hot-rolling scheduling method for compact strip production. The method comprises the steps of constructing a hot-rolling production scheduling model including a non-outsourcing material optimization model and a plate blank thickness optimizing model with the target of minimizing the quantity of non-outsourcing materials, minimizing the maximum thickness change amount of two adjacent plate blanks in the same rolling unit, and minimizing the changing time of the thickness of the plate blanks; determining the constraint conditions of the non-outsourcing material optimization model and the plate blank thickness optimizing model according to technological constraints in an actual hot-rolling production process; adopting an improved heuristic algorithm to solve the non-outsourcing material optimization model to obtain the quantity of optimal rolling units and the quantity of the non-outsourcing materials; adopting a multi-objective evolutionary algorithm based on decomposition to solve the plate blank thickness optimizing model to obtain the optimal change value of the thicknesses of adjacent plate blanks and the optimal thickness changing time. According to the comparison between a scheduling plan obtained through the hot-rolling scheduling method and a production plan which is worked out manually, the plate blank specification skip cost and roll replacement cost can be effectively reduced, and thus the production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of compact hot strip production, and more particularly relates to a hot rolling scheduling method for compact hot strip production. Background technique [0002] In the hot-rolling scheduling of compact hot-strip production, during the rolling process, due to high pressure and high speed, the working rollers are severely worn, so it is necessary to replace the rolls after rolling several slabs, otherwise the quality of the slabs will be affected. The slab rolled in one roll change cycle is called a rolling unit, and each rolling unit contains slabs with different thicknesses and is ordered according to certain rules. If the slab of a certain thickness is not enough, it is necessary to add non-commission material to meet this constraint. How to reasonably determine the rolling sequence of rolled slabs has become a key issue in hot rolling scheduling, which is directly related to product quality and productio...

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Problems solved by technology

[0003] Chinese patent CN102981413A discloses a simulation method for continuous casting and rolling steelmaking planning, but the simulation method mainly solves the matching problem of steelmaking and rolling, and does not give a specific method for solving the hot rolling scheduling problem

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