Research Article
[Retracted] An Improved Ant Colony Optimization Approach for Optimization of Process Planning
Table 4
Precedence constraints for Part 1.
| Constraints | Descriptions | Hard or soft |
| Tool interactions | OP1 should be prior to OP2. | Hard | Datum interactions | OP6 should be prior to OP7. |
Hard | OP10 should be prior to OP11. | OP13 should be prior to OP14. | Thin-wall interactions | OP9 should be prior to OP8. |
Soft | OP12 should be prior to OP10. | Material removal interactions | OP8 should be prior to OP9. |
Soft | OP10 should be prior to OP12. | OP13 should be prior to OP14. | OP3 should be prior to OP4. |
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