| Fault condition | Failure causes and eliminating methods |
| Diameter is too large, the diameter is too small | 1, the main axis of the position adjustment is too far; 2, rolling time is too short; 3, rolling pressure is too low. |
| Diameter is too large, diameter qualified | Blank diameter is too large |
| Diameter is qualified, outside diameter is too small | Blank diameter is too small |
| Diameter is qualified, outside diameter is too large | Blank diameter is too large |
| Diameter is too small, outside diameter is too large | 1, the center of the spindle is too small; 2, rolling time is too long; 3, rolling pressure is too high. |
| No taper in the middle diameter, outside diameter of taper | Blank with taper |
| Middle diameter taper | Two the parallel adjustment of the rolling wheel is not good, so the adjustment should be carried out. |
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