Общий каталог Tungaloy 2020 - 2021 - страница 1657

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Drilling Tools B Guidelines for correct usage o f carbide drills

Holders for solid carbide drills: OK

A collet chuck holder is recommended for use with C carbide drills. When using a milling chuck holder, a collet chuck with a straight shank or straight collet should be used.

Collet chuck Drill chuck D

OK Chucking drills: Radial run out and lip height should be E less than 0.02mm. If run out or lip height

is larger (close to 0.05mm), machining is possible. However, less accurate holes or

short tool life may be a result.Run out0.02 mmF
Overhang length should be as short as
possible.
”0.02Clamp the chuckLongerDo not chuck
on the shankoverhang thanthe fl ute.
Lip height ”0.02 mmand ensure therequired
overhang is asis notG

short as possible. recommended.

Coolant Supply: External supply Internal supply When using a drill without a coolant hole, H

VerticalHorizontalThrough theThrough
such as the DSW-DE type, coolant shouldrotating holderthe spindle

always be directed to the entrance of the hole. Maintaining this supplying is very important for stable drilling performance. I External coolant should be Coolant pressure: 0.5 - 2.0 MPa

supplied at high pressure and (Air pressure for MQL: 0.3 - 0.5

directed at the hole entry point.MPa)J
Clamping workpieces:
As solid carbide drills have a higher thrust
force, machining with low rigidity or
Vibration orAdequate support

inadequate support can cause fractures or defl ection for preventing K

breakages through vibration. It is important defl ection the workpiece is rigidly clamped and has adequate support. L The criteria of tool life:

Corner wear width: equal to margin width Feed mark: 1 - 2 feed marks on the margin M Spindle load increase: 30% higher than starting level Corner wear width = margin width Irregular situation: worse chip control, hole diameter change, worse surface fi nish, larger burrs, bigger sound. Feed mark = 1 - 2 feed marks