The rolling schedule of Zircaloy-4 strip during multi-schedule and multi-pass hot rolling process

Hot rolled zirconium alloy strip has a feature of multi-schedule and multi-pass, which undergoes the complex working condition of repeatedly manual experiences. Rolling schedule is a key technology that directly influences strip product quality, which is affected by many factors such as mechanical properties, temperature, strain rate, and capacity of mill. The multi-objective optimization model for hot rolling schedule of zirconium alloy strip is presented by the improve particle swarm optimization algorithm (IPSO), rolling force ratio distribution, and good strip shape as the objective functions. Meanwhile, based on the penalty function method transforming the constraint problem into the unconstrained problem, we used on-line applications for optimized rolling schedule and the comparison provides an effective path as a reference of practical control technology.