针对模具热处理车间生产难以有效控制这一实际问题,提出一种基于负荷控制理论的生产计划与控制方法。建立模具制造车间三层负荷控制模型,并针对热处理车间,分析其负荷控制的关键问题,给出一种考虑负荷动态均衡性的热处理任务转序决策方法;构建以交货表现和设备利用率为双目标的优化调度模型;应用离散事件仿真原理和折衷规划理论,建立一类基于周期和事件驱动的混合滚动调度求解算法,并分析该算法的时间复杂度;以所提算法为基础,开发热处理车间生产计划系统,通过该系统计算得到多组目标函数权重下的算法调度结果,进一步分析不同权重对算法的影响,并同时与其他几类算法的调度结果进行对比分析,说明所提算法的实用性和有效性。
Due to various complicated factors in mould manufacturing system,it is especially difficult to control the mould heat-treatment production.To deal with this problem,a workload-control-based production planning and control approach is proposed.A three-level model of workload control for mould shop floor is presented.For heat-treatment shop floor,the key problems for its workload control are analyzed.Moreover,the workload dynamic balancing is taken into consideration,the rules on determining when and where the heat-treatment jobs must go are also proposed.Both the delivery performance and machine utilization rate are used for developing the scheduling optimization model.A periodic and event-driven rolling horizon algorithm is developed via the discrete event simulation and the compromise programming.And the analysis of algorithmic time complexity is then presented.The production planning system of heat-treatment shop floor is developed on the basis of the algorithm,thereby obtaining multi scheduling results,where each result corresponds to a team of weights.Based on these results,the effects of different weights on the algorithm are analyzed.At the same time,the performances of the proposed algorithm and other similar algorithms are compared,which shows that the proposed algorithm is more practical and effective.