Cause
The design value of reamer outer diameter is too small;
The cutting speed is too low;
The feed rate is too large;
The main deflection angle of reamer is too small;
Improper selection of cutting fluid;
When sharpening, the worn part of the reamer is not worn off, and the elastic recovery reduces the aperture;
When reaming steel parts, the allowance is too large or the reamer is not sharp, which is easy to produce elastic recovery, so that the aperture is reduced and the inner hole is not round, and the aperture is unqualified.
Solution
Change the outer diameter of reamer;
Properly increase the cutting speed;
Reduce the feed rate appropriately;
Properly increase the main deflection angle;
Choose oil-based cutting fluid with good lubricating performance;
Exchange reamers regularly and grind the cutting part of reamer correctly;
When designing the reamer size, the above factors should be considered, or the value should be taken according to the actual situation;
Make experimental cutting, take appropriate allowance, and sharpen the reamer.