关键词: STEP-NC标准, 加工特征, 加工工步序列, 神经网络, 加工操作选择

Abstract: Aiming at the generation problems of STEP-NC oriented workingsteps sequence for STEP-NC nonlinear process planning,a typical intelligent decision method of workingsteps sequence based on BP neural network was put forward.The STEP-NC data model based on machining features was analyzed,and the model for selection of STEP-NC oriented working steps sequence included selection of machining operations,selection of machine and selection of tool were constructed.The intelligent algorithm for solving STEP-NC oriented working steps sequence was proposed and the model valielity was trained and tested.The presented method was fully integrated the quantitative decision of machining experience into job shop with qualitative decision of neural network.STEP-NC oriented workingsteps sequence of the given part was intelligently generated by means of the selection probability of workingsteps sequence.A prototype system was developed based on Solidworks CAD platform,and an illustration for workingsteps sequence generation of a hole was given to verify the correctness and effectiveness of the proposed method.

Key words: STEP-NC, machining features, workingsteps sequence, neural networks, machining operation selection