Research Article
A Graph-Based Ant Colony Optimization Approach for Process Planning
Table 2
Precedence constraints between operations.
| Features | Operations | Precedence constraints description |
| F1 | Op1 | Op1 is prior to Op2 and Op3 for Rule 2. Op1 is prior to Op4 and Op5 for Rule 5. |
| F2 | Op2 | Op2 is prior to Op3 for Rule 3. |
|
F3 | Op4 | Op4 is prior to Op5 for Rule 3. | Op4, Op5 | Op4 and Op5 are prior to Op6 for Rule 5. Op4 and Op5 are prior to Op7 for Rule 5. |
| F4 | Op6 | Op6 is prior to Op2 and Op3 for Rule 4. |
|
F6 | Op8 | Op8 is prior to Op9 for Rule 3. | Op8, Op9 | Op8 and Op8 are prior to Op7 for Rule 5. |
|
|