Problème |
Causes |
Solutions |
Rupture
de foret
|
In accurate machine
Work material deformation |
Increase the rigidity of machine, drill
and work clamping |
Relief angle is too small |
Regrind correctly |
Feed rate is too high |
Decrease the feed rate |
Excessive tool wear |
Regrind |
Chip packing |
Select suitable drill (wide flute, high
helix oil hole drill). Change cutting conditions (feed
rate or adopt step drilling). |
Difficulty entering the material |
Select high rigid tool & rigid machine
Increase work clamping rigidity
Select a low cutting resistance thinning
Use centering
Work piece should be horizontal
Use bush drill |
Problème |
Causes |
Solutions |
Ébrèchement
des angles extérieurs
|
In appropriate tool material |
Choose suitable tool material |
Uneven hardness distribution on the work
material |
Iso static treatment
Change tool, material & cutting conditions, machining
method (EDM) |
Cutting or feed speed is too high |
Reduce cutting speed or feed |
Not enough coolant |
Change lubrication method |
Problème |
Causes |
Solutions |
Ébrèchement
de l'arrete tranchante
|
Large run out after attached to machine
Loose hold |
Check holder and/or select another one
Check run out after fixing to the chuck |
Relief angle is too small |
Regrind correctly |
Tool material is not suitable |
Choose suitable tool material |
Cutting speed or feed is too high |
Reduce cutting speed or feed |
Problème |
Causes |
Solutions |
Usure anormale
des angles extérieurs
|
Tool late regrinding |
Regrind after a shorter time of use |
Bad alignment (for lathe turning) |
Check/adjust the alignment |
Cutting speed too high |
Decrease the cutting speed |
Point dimensions are not suitable |
Select correct point dimensions |
Tool materials not suitable |
Choose suitable tool material |
Coolant is not suitable |
Change coolant |
Problème |
Causes |
Solutions |
Grande usure,
ébrèchement, écrasement de l'arrete |
Feed rate is too large |
Decrease feed rate |
Point dimensions are not suitable |
Select correct point dimensions |
Tool materials is not suitable |
Choose suitable tool material |
HAUT |
Relief angle is too small |
Increase relief angle |
Problème |
Causes |
Solutions |
Ébrèchement
de la dépouille tranchante |
Bush diameter is too small
Chip packing between drill & bush |
Select correct bush diameter or select
drill with chip breakers |
Problème |
Causes |
Solutions |
Acumulation
de matière sur la dépouille |
High heat generation due to large wear
on the cutting edge |
Regrind |
Lubrication is insufficient |
Change lubrication method |
Coolant is not suitable |
Change coolant |
Bad chip ejection
Ductile material |
Change drill or the cutting conditions |
Problème |
Causes |
Solutions |
Rupture
du tenon (tang)
|
Shank slippage due to some kind of defect |
Take off the defect by honing the surface |
Defect of the inner surface of Morse taper
holder |
Change holder or correct the surface of
Morse taper holder |
Low accuracy of regrinding |
Regrind correctly |
Problème |
Causes |
Solutions |
Bruit de
vibration |
Relief angle is too big |
Grind a smaller relief angle |
Low rigidity of the tool |
Use drill with high rigidity |
Problème |
Causes |
Solutions |
Enrolement du copeau
autour du foret |
Low extended and curly chips
Chips are stubbed in the flute |
Change drill and cutting conditions |
Problème |
Causes |
Solutions |
Usure d'un
seul coté HAUT
|
Large run out after attached to machine |
Check holder and/or select another one
Check run out after fixing to the chuck |
Bad alignment (for lathe turning) |
Check/adjust the alignment |