Table 3.
Levels of factors in orthogonal experiments.
| Level | Factor | |||
|---|---|---|---|---|
| (A) D2/(mm) | (B) b2/(mm) | (C) φ/(°) | (D) Z | |
| 1 | 166 | 9 | 80° | 7 |
| 2 | 162 | 8 | 70° | 6 |
| 3 | 158 | 7 | 60° | 5 |
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