Chen Wei

Bio: Chen Wei is an academic researcher. The author has contributed to research in topics: Continuous casting & Casting (metalworking). The author has an hindex of 1, co-authored 1 publications receiving 2 citations.

Optimization and Control of Secondary Cooling Parameters of Continuous Casting

Abstract: The essential aim of building numerical models for any process is to optimize it.The use of optimization strategies can be seen as a useful tool in the search of operational parameters that maximize or minimize some result of a dynamic process.In order to ensure product quality and high productivity,based on the subproblem approximation method,an artificial intelligence optimization system was established to search out the optimum water consumption in secondary cooling zone of continuous casting.This system can optimize the parameters of continuous casting for different steel grades,at different casting speed,with different metallurgical constraints and etc.The optimum process parameters would make it possible to run the caster at its maximum productivity,minimum cost and to cast defect free products.The optimization system,which includes both a numerical heat transfer module and a design optimization module,works by automatic iteration between the two modules.

Generalized constructal optimization for the secondary cooling process of slab continuous casting based on entransy theory

Abstract: Based on constructal theory and entransy theory, a generalized constructal optimization of a solidification heat transfer process of slab continuous casting for a specified total water flow rate in the secondary cooling zone was carried out. A complex function was taken as the optimization objective to perform the casting. The complex function was composed of the functions of the entransy dissipation and surface temperature gradient of the slab. The optimal water distribution at the sections of the secondary cooling zone were obtained. The effects of the total water flow rate in the secondary cooling zone, casting speed, superheat and water distribution on the generalized constructal optimizations of the secondary cooling process were analyzed. The results show that on comparing the optimization results obtained based on the optimal water distributions of the 8 sections in the secondary cooling zone with those based on the initial ones, the complex function and the functions of the entransy dissipation and surface temperature gradient after optimization decreased by 43.25%, 5.90% and 80.60%, respectively. The quality and energy storage of the slab had obviously improved in this case. The complex function, composed of the functions of the entransy dissipation and surface temperature gradient of the slab, was a compromise between the internal and surface temperature gradients of the slab. Essentially, it is also the compromise between energy storage and quality of the slab. The “generalized constructal optimization” based on the minimum complex function can provide an optimal alternative scheme from the point of view of improving energy storage and quality for the parameter design and dynamic operation of the solidification heat transfer process of slab continuous casting.

Study for the Initiation Locations of Longitudinal Surface Cracks on Beam Blank in the Mould of Continuous Casting

Abstract: During beam blank’s continuous casting production, lots of longitudinal cracks easily appear on the surface. In order to study the initiation locations of longitudinal surface cracks in the mould, a coupled thermo–elasto–plastic finite element model was established to compute the temperature and stress on the software ABAQUS. A user subroutine DFLUX was used to simulate the heat transfer process and thermal field. The stress field under the influence of thermal stress, surface friction, ferrostatic pressure was analyzed by the mean of contact algorithm and restart scheme. According to the results, it can be inferred that the forming locations of longitudinal surface cracks easily appear on the surface of the fillet, the web center, the flange tip and the flange center. Moreover, initiation locations of longitudinal surface cracks should be: on fillet at a distance of 200 mm to the meniscus, and the other three sections at a distance of 180 mm to the meniscus.