Integrated Optimization Of Layout-selecting And Production Scheduling Of Order-based Robot Stamping Cell

With the current development trend of personalized customization,the multi-variety and small-batch order-based production mode will challenge the management and operation of traditional stamping production.An idea of integrating and optimizing layout-selecting and production scheduling is proposed to deal with the problems of long production preparation cycle,low efficiency and low resource utilization in order-based stamping production.Aiming at the stamping cell with multiple handling robots,a systematic study is carried out on the integrated optimization problem of the layout-selecting and production scheduling of the orderbased robot stamping cell.The main research work is as follows.(1)An idea of integrated optimization layout-selecting and production scheduling is proposed.In view of the defects of long preparation cycle,low efficiency and low resource utilization in the traditional stamping production method,and the use of the mixed layout continuous stamping method,the mixed production scheduling is difficult,and the inventory is easy to be backlogged.An integrated optimization method for layout-selecting and production scheduling is proposed.an integrated optimization model was established with the optimization objectives of minimizing intermediate inventory,die changing time and total delay time.(2)Aiming at the above integrated optimization model,a multi-layer structure encoding and decoding are designed.encoding method consists of three parts: order-selecting array,CNC punching selection array and process sorting array.This method can express a scheduling scheme succinctly and effectively,and realize the unified solution of the integrated optimization problem of the layout-selecting and production scheduling of the order-based robot stamping cell.In the decoding process,the scheduling of the robot is considered,and the unified distribution of material transportation tasks and production tasks in the robot stamping unit is realized.Among them,the robot scheduling strategy follows the principle of the earliest arrival at the starting point of handling and the principle of the shortest execution time,and at the same time verifies the feasibility of encoding and decoding.(3)Based on the above coding and decoding,a hybrid whale optimization algorithm based on whale optimization algorithm and NSGA-Ⅱ is designed for the model.Several sets of test cases are designed and compared with other algorithms,the results verify the feasibility and effectiveness of the algorithm.And for a single case,the integrated optimization result is compared with the continuous stamping method of mixed layout,which shows the feasibility and superiority of the method in this paper.(4)The dynamic scheduling problem considering order insertion and periodic rescheduling of the integrated optimization problem of the layout-selecting and production scheduling of the order-based robot stamping cell is studied.Firstly,the dynamic problem is expounded.Then a rescheduling strategy is designed to solve the dynamic scheduling problem by combining the hybrid whale optimization algorithm with the rolling scheduling strategy driven by events and cycles.Finally,the effectiveness of the proposed strategy is verified by experiments.