Каталог Iscar сверла со сменной режущей частью 2022 - страница 128

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Troubleshooting

Irregular Conditions for DR Drills

Chipping Along Machine Troubleshooting Cutting Edge Vibrations

If surface slope exceeds 5º, reduce feed by 50% Solutions Solutions

during penetration or when exiting. It is preferred1 Reduce entrance feed.1 Check mounting of drill.
to pre-face the surface to eliminate slope.2 Choose a tougher grade.2 Check mounting
3 Choose a geometryof workpiece.
123with open chip breaking3 Increase feed. If drilling

for higher feeds. a very soft material, (SOMT, WOLH) reduce feed and 4 Reduce feed.* increase speed.* 5 Reduce cutting speed. 4 Reduce cutting speed.

6 Increase coolant pressure. 1 Drilling into a pre-hole reduces feed to eliminate deflection (1) of the drill body. 2 Drilling an interrupted cut reduces feed during crossing to eliminate deflection (1) of the drill body. 3 Insufficient stability of workpiece requires additional support. Reduce feed.

(1) Deflection may be observed by a mark on the drill body.Chipping of Center InsertInsufficient Torque
Note: For irregular applications, use DR drills with XOMT

inserts as a first priority. Solutions Solutions

Stacked Plates1 Check mounting of drill.1 Reduce feed.*
2 Check mounting2 Choose a geometry with

Drilling operation is not recommended, but may be done of workpiece. a looser chipformer.

by specially designed drills in 16-60 mm range. 3 Reduce entrance feed. Apply standard cutting data. 4 Reduce cutting speed. 5 Check drill runout Regular Conditions for DR Drills (should be 0.05 mm

maximum).

Note: For irregular applications, use DR drills with XOMT inserts as a first priority.

Indexable Insert Drills -

Troubleshooting DR Chips

Chip Jamming due Chip Jamming to Long Chips despite Short Chips

Solutions Solutions 1 Increase feed. If drilling a 1 Increase coolant very soft material, reduce pressure/volume. feed and increase speed. 2 Reduce cutting speed. 2 Choose a geometry with a tighter chipbreaker for lower feeds (GF). 3 Long chips that rotate around the drill are problematic. If chip formation can not be improved by changing the machining conditions, use a pecking cycle.

Excessive Flank Wear Insufficient Power Solutions Solutions 1 Reduce cutting speed. 1 Reduce cutting speed. 2 Increase coolant 2 Reduce feed.* pressure/volume. 3 Choose a geometry with 3 Choose a better wear a looser chipformer. resistant grade. * Use GF chipformer