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Usinage - Perçage - Résolution Problèmes: -» De Foret   -» De Trou
Problème Causes Solutions
Rupture de foret

Drill breakage
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
Chipping of corner edge
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
Chipping of corner edge
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
Abnormal wear on corner part
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)
Tang breakage
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
 
 
 
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