Техническая информация Sumitomo - страница 17

Technical Guidance
Drilling Edition MultiDrill Usage Guidance
■ Drill Maintenance ■ Using Cutting Oil
● External supply of coolant
(1) Collet Selection (1) Choosing of Cutting Oil ● Vertical drilling
and Maintenance ● If cutting speed is more than
● Ensure proper chucking of 40m/min, cutting oil JISW1 type 2
drills to prevent vibration. is recommended for its good
Collet cooling effect & chip removal
Collet chucks (thrust bearing
ability as it is highly soluble.
type) provide strong and ● If cutting speed is below 40m/min
secure grip force.

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and longer tool life is a priority,
Drill chucks and keyless chucks non-water cutting oil JISA1 type 2,
are not suitable for MultiDrills as an activated sulphuric chloride oil,
they have a weaker grip force. Collet Chuck Drill Chuck Use high pressure Easy usage
is recommended for its lubricity.
at entrance
* Non-water soluble oil may be
● When replacing drills, flammable. To prevent fire, a
Collet substantial amount of oil should
regularly remove cutting ● Horizontal
debris inside the collet by be used to cool the component drilling
cleaning the collet and the so that smoke or heat will not be
generated.
spindle with oil. Repair marks
with an oilstone. Use high pressure at entrance
(2) Supply of Coolant
If there are marks, repair with an ● If using an external supply of ● Internal supply of coolant
(2) Drill Installation oilstone or change to a new one. coolant, fill a substantial amount
● Coolant supply
from the inlet. Oil pressure range:
● The peripheral run-out of the 0.3 to 0.5 MPa, oil level range: holder
drill mounted on the spindle 3 to 10L/min.
should be controlled within ● If using an internal supply of
0.03mm. coolant (Ex: HK Type) for holes
● Do not chuck on the drill flute. For holes ø4 or smaller, the oil

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If drill flute inside the holder, pressure must be at least 1.5MPa
chip removal will be obstructed to ensure a sufficient supply of
● Machine internal supply
thus causing damage to the coolant.
drills. holes ø6 or larger: 0.5 to 1.0 MPa
for hole depths below 3 times the
drill diameter, and 1 to 2 MPa or
more for hole depths more than 3
Edge run-out to be Do not grip on the times the diameter.
within 0.03mm. drill flute.

■ Calculation of Power Consumption and Thrust ■ Work Clamping
Especially
● Calculating Cutting Speed
High thrust forces occur during
high-efficiency drilling. Therefore, large drills
the workpiece must be supported to
π x DC x n prevent fracture caused by bending.
vc =
1,000
Hole Depth


n Also, large torques and horizontal
H cutting forces occur. Therefore, the
1,000 x vc workpiece must be clamped firmly Bending Fracture
n= enough to withstand them.
π x DC DC


● Calculating Feed Rate Per Revolution and Per Tooth vc : Cutting Speed (m/min) ■ Drill Regrinding
v π : Circular Constant ≈ 3.14 ● When to regrind
● Tool life determinant
vf = n x f f = f DC : Drill Diameter (mm)
n When one or two feed marks (lines) appear on the margin, 1 to 2
n : Spindle Speeds (min-1) when corner wear reaches the margin width, or when small feed marks
chipping occurs, it indicates that the drill needs to be sent
vf : Feed Rate (mm/min)
● Calculation of Cutting Time for regrinding.
f : Feed Rate per Revolution (mm/rev)
H H : Drilling Depth (mm)
● How and where to regrind
T= T : Cutting Time (min)
vf We recommend applying regrinding and recoating.
HB : Brinell Hardness Recoating is recommended to prevent shortening of
Appropriate
tool life. Note, ask us or an approved vendor to recoat
tool life
● Calculation of Power Consumption and Thrust
with our proprietary coating.

Power Consumption(kW)=HB× DC0.68× vc1.27× f 0.59/36,000 ● Regrinding on your own
Customers regrinding their own drills can obtain
Excessive
marks
N
Technical Guidance /


MultiDrill Regrinding Instructions from us directly or
Thrust(N)=0.24× HB× DC0.95× f 0.61× 9.8
References


your vendor.
* When designing the machine, an allowance of 1.6 x Power Consumption
and 1.4 x Thrust should be given.
Over-used


N25