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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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