Техническая информация Sumitomo - страница 17

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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

cooling effect & chip removal Collet chucks (thrust bearing Collet ability as it is highly soluble. type) provide strong and If cutting speed is below 40m/min

（ secure grip force.）and longer tool life is a priority,
Drill chucks and keyless chucksnon-water cutting oil JISA1 type 2,
are not suitable for MultiDrills asan activated sulphuric chloride oil,

they have a weaker grip force. Collet Chuck Drill Chuck is recommended for its lubricity. Use high pressure Easy usage

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

  • Internal supply of coolant

If there are marks, repair with an If using an external supply of

(2) Drill Installation oilstone or change to a new one. coolant, fill a substantial amount

from the inlet. Oil pressure range: Coolant supply

  • The peripheral run-out of the holder

0.3 to 0.5 MPa, oil level range: 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

pressure must be at least 1.5MPa If drill flute inside the holder,

chip removal will be obstructed to ensure a sufficient supply of

  • Machine internal supply
thus causing damage to thecoolant.
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
Do not grip on the Edge run-out to be times the diameter.

within 0.03mm. drill flute.

  • Calculation of Power Consumption and Thrust
  • Work Clamping

High thrust forces occur during Especially

Calculating Cutting Speed large drills high-efficiency drilling. Therefore, the workpiece must be supported to πxDCxn

v = prevent fracture caused by bending.

c1,000Also, large torques and horizontal
n
Hcutting forces occur. Therefore, the

1,000 x v workpiece must be clamped firmly Bending Fracture

n = c π x DC enough to withstand them. DC

  • Drill Regrinding

Calculating Feed Rate Per Revolution and Per Tooth v : Cutting Speed (m/min)

c

π: Circular Constant ≈ 3.14●
vTool life determinant
v = n x ff =f● When to regrind
fnDC : Drill Diameter (mm)
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 smallfeed marks
v: Feed Rate (mm/min)chipping occurs, it indicates that the drill needs to be sent
● Calculation of Cutting Timeffor regrinding.
f: Feed Rate per Revolution (mm/rev)
HH: Drilling Depth (mm)
  • How and where to regrind

T = T : Cutting Time (min)

v We recommend applying regrinding and recoating. f 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.

N

××●Excessive
Power Consumption(kW)=HB× DC0.68v 1.27f 0.59/36,000Regrinding on your own

c marks Customers regrinding their own drills can obtain MultiDrill Regrinding Instructions from us directly or Thrust(N)=0.24× HB× DC0.95×f 0.61× 9.8

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