Common Problem Of Deep Hole Drilling

Poor   hole deflection

a)           Incorrect   workpiece positioning and fixture mounting, incorrect alignment

b)          Substandard   drill bush, large clearance between the drill bush and drill bit

c)           Drill   stem not properly supported.

d)          Workpiece   structure (such as too big wall thickness difference) and material (material   not uniform) problem

e)           Clearance   existing between drill bush and workpiece.

Poor   surface finish

a)           Tool   low rotary and feeding of main shaft

b)          Improper   cutting oil selected, low pressure and flow, too high oil temperature

c)           Poor   filter effect of cutting oil

d)          Worn   cutter

e)           Machine   tool vibration, unstable workpiece fixation.

Too   big hole diameter

a)           Substandard   drill bush, Incorrect workpiece positioning and fixture mounting, incorrect   alignment.

b)          Clearance   existing between drill bush and workpiece.

c)           Improper   drill bit cutting angle ground.

Bellmouth hole

a)           Too   large clearance between drill bush and drill bit

b)          Poor   rigidity of guiding mechanism

Short   cutter life or cutter burst

a)           Too   high or low rotary and feeding speed of main shaft, select suitable cutting   parameters according to the material to be machined.

b)          Improper   drill bit grinding angle.

c)           Improper   gun drill brand and model selected.

d)          Improper   cutting oil selected, low pressure flow, too small oil tank volume, improper   oil temperature control

Unsmooth   chip removal or

interrupted   chip removal

a)           Low   cutting oil pressure or flow

b)          Difficult   chip breaking of cutting material (such as stainless steel), grind chip   breaker groove.

c)           Too   big cutting feed, relatively slow rotary speed of main shaft.