What Are The Common Problems in Deep Hole Machining?
Dec 13, 2021
1. The center line of the hole after reaming is not straight:
The reason why the center line of the hole is not straight after forming the reaming is: the reamer is not straightened before the reaming, especially when the hole diameter is small, because the rigidity of the reamer is relatively poor, the original curvature cannot be corrected; the cutting part is inverted The cone is too large; the reamer is displaced in the gap in the middle of the intermittent hole; when hand reaming, too much force in one direction forces the reamer to deflect to one end, destroying the verticality of the reaming hole.
2. The inner and outer surfaces of the hole have obvious edge surfaces:
The reason why the inner and outer surfaces of the hole have obvious edge faces is: the margin of the reaming hole is too large. The clearance angle of the cutting part of the reamer is too large. The reaming cutting edge band is too wide. There are pores, blisters, and excessive spindle swing on the surface of the workpiece.
3. The surface roughness of the inner hole is high:
The reason for the high surface roughness value of the inner hole is as follows: an inappropriate cutting fluid is selected. The cutting speed is too high. The margin of the reaming hole is too large or uneven or too small, and part of the exterior is not hinged. Reaming chip removal is not smooth; the reamer is excessively worn; the reamer is scratched, and there are burrs or chipping on the cutting edge; there is a built-up edge on the cutting edge; because of the data, it is not suitable for zero rake angle or negative rake angle reamer .
4. The service life of the reamer is low:
The reasons for the low service life of the reamer are: the reamer is burned during sharpening. Select the unsuitable cutting fluid, the cutting fluid does not flow smoothly, and the surface roughness value of the cutting part and the reaming cutting edge is too high. The reamer information is inappropriate.
5. The azimuth accuracy of the reamed hole is too poor:
The reasons for the poor azimuth accuracy of the reamed hole are: the wear of the guide sleeve or the distance between the bottom end of the guide sleeve and the workpiece is too far. The short length of the guide sleeve, poor accuracy, and looseness of the spindle bearing will cause the reamed hole to have an extremely poor azimuth accuracy.
6. The reamed inner hole is not round:
The reasons for the non-circular reamed inner hole are: the length of the reamer is too long, and the rigidity is still lacking, oscillation will occur during reaming; the main deflection angle of the reamer is too small. Reaming cutting edge is narrow. Reaming allowance is too low. There are gaps and cross holes on the outside of the inner hole. There are blisters and pores on the outside of the hole. The spindle bearing is loose, there is no guide sleeve, or the gap between the reamer and the guide sleeve is too large, or the thin-walled workpiece is clamped too tightly, and the workpiece is deformed after removal.
