Fig 1.
The layout illustration of the machining workshop for large-size valves.
Fig 2.
Machining features of a butterfly valve body.
Fig 3.
Sequence relationship network of features.
Table 1.
Related processing information of the butterfly valve body.
Fig 4.
Simplified AND/OR graph of the butterfly valve body.
Table 2.
Explanation of the mathematical model’s symbols.
Fig 5.
The framework of the proposed NSAG-II method.
Fig 6.
An encoding instance of two jobs.
Fig 7.
Cross-sectional views of a butterfly valve and a gate valve of large size.
Table 3.
Pertinent parameters of machines.
Table 4.
Processing information on all the parts for the butterfly valve and the gate valve.
Table 5.
Parameters of the presented method.
Fig 8.
The comparison of two criteria optimization objectives.
Fig 9.
Gantt chart of a best optimal set.
Table 6.
A detailed process planning arrangement from a chosen solution in an optimal set (partial).