Cemented Carbide Drill Processing Abnormal &Solutions

Cemented carbide drill tool is used for drilling in the solid material through holes or blind holes and reaming of the existing holes.

Cemented carbide drill processing abnormal causes and countermeasures

Situation	Reasons	Solution
Drilling into the oval	Form threaded scratches	1.Using a suitable drill sets 2.Reduce the clearance angle 3.Check the drill bit tip angle is symmetrical with both sides length
	Produce fibrillation, vibration	1.Reduce the clearance angle 2.Web thinning 3.Shorten cemented carbide drill length , increased drill bit rigidity 4.Check cemented carbide drill angle grinding is correct or not 5.Check the fixture cemented carbide drill contact situation 6.Pre-drilled center hole 7.Improve the rigidity of the working machine
	The chip discharge is not easy	1.Increase the weekly amount of feed 2.Select the correct helix angle 3.Increasing the groove width ratio 4.Intermittent feed
Drilling tilt	Adverse when cutting	1.Using the appropriate drill sets 2.Reduce the cut when the weekly amount of feed 3.Pre-drilled center hole
	Drill rigidity is bad	Shorten cemented carbide drill length , increased drill bit rigidity
	Drill bit angle is wrong	Resharpening cemented carbide drill
Exterior angle wear	Cutting speed is too fast	1.Reduce the cutting speed 2.Increase the clearance angle 3.Sufficiently supplied cutting fluid 4.Improve cemented carbide drill material
Hole wall roughness	Blade wear is too large	Resharpening cemented carbide drill
	Feed speed too large	Lower feed speed
	Cutting obstruction	Increase the number of retraction
	Other	1.Web thinning 2.Use suitable guide bush 3.Improve the rigidity of the working machine
Drill breaks while cutting	Feed too large	To reduce Every feed rate
	Cutting obstruction	1.Increasing the groove width ratio 2.Select the appropriate helix angle
	Insufficient rigidity of the drill	1.Reduce the weekly amount of feed 2.Shorten drill length and increase cemented carbide drillrigidity 3.Increase web thickness
		1.Reduce weekly feed 2.working remains fixed 3.Improve the rigidity of the working machine
Chipping of the cutting edge	Feed too fast	Reduce the weekly amount of feed
	Insufficient strength of the cutting edge	1.Reduce the clearance angle 2.Reduce weekly feed 3.working remains fixed
	For use in the operations of the counterbore	1.Increase the drill tip angle 2.Reduce the cutting speed
Pore size-tolerance	Drill tip angle is not symmetrical or blade different sizes	1.Resharpening cemented carbide drill 2.Web thinning 3.To reduce cemented carbide drill tip angle 4.Use drill sets

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