Tube shape: one is due to the short size of the mandrel, the difference between the two mandrels before and after hollow rolling and the upper and lower raceway holes; the other is caused by the turning of the mandrel, the excessively large rolling groove and the gap. Roller, mandrel inner diameter and tube blank size are too large, diameter reduction is too large.
Geometric deviation: Usually due to the wear of the deformed tool, the reduction of the mandrel and the adjustment of the size, the amount of springback after rolling is not considered. The deviation of the diameter of the rolling tube is mainly caused by the problem of the finishing part of the hole shape.
In the production process of fine boring rolling pipes, the common problems are often the above problems. In the work production, if the above phenomenon is solved in time, the waste in the production process can be reduced as much as possible, and the production efficiency is provided.