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Technical Information for Mach long Drills MLD productivity : MLD0680-20A (∅ 6.8㎜
x 140 x 170L x 7S)
Tool
vc(m/min)
fn(mm/rev)
n(min-1)
vf(mm/min)
Coolant
Gun Drills (Carbide) High Speed Steel Long Drills Mach Long Drills
100
0.04
4,683
187
Through coolant oil
No required
15
0.10
703
70
Outer coolant oil
15mm/9times
80
0.14
3,747
525
MQL- Air 0.5MPa, Oil 20cc/h
No required
Step operation
Cycle time Advantages of MLD against conventional drills ∙Shorting cycle time up to 1/3 ~ 1/8 times ∙Increasing productivity by process reduction ∙It is easy to reduce running cost. ∙Improving of effective working condition ∙Drill guide bush is not required.
■Function of MLD & MLDP Relationship of point angle between MLD & MLDP
To make the optimal of MLD
MLD
�Pliot drilling
Shock on edge of drill : Large
∙vc = Normal ∙fn = Normal
1st
Toughness limit that edge can withstand
�1st MLD drilling (Entering stage) ∙vc = 15mm/min ∙fn = 0.5
MLD
<Small point angle of Pliot Drill : Unstable condition> MLDP
Indexable Drills Mach(long) Drills
MLD
�2nd MLD drilling (Machining stage)
2nd
�Stable condition
Drills
� Increase of edge chipping
Pilot drill
>>>
�Unstable condition
∙vc = Normal ∙fn = Normal
Toughness limit that edge can withstand
�3rd MLD drilling (Piercing stage)
Shock on edge of drill : Small
∙vc = Normal ∙fn = Normal feed / 2
3rd Pilot drill
<Large point angle of Pliot Drill : Stable condition>
Vulcan Drills
■Application example 1)
■Application example 2) Workpiece : Part of automobile (GC250) �Machine : Rotary milling machine �Coolant : Oil (3Kg/㎠, 2ℓ/min) �Designation : MLD0400-25A (∅4mm, Aspect ratio 16D) �Cutting condition vc : 63m/min fn : 0.1mm/rev �Tool life : 4400 holes, 207m
C2
C2
C4
C4
C6
Carbide Drills Deep Hole Drills
Workpiece : Part of automobile (SCM440, HB255~330) �Machine : Horizontal milling machine �Coolant : MQL (30cc/h) / Air : 0.7MPa �Designation : MLD0600-22A (∅6mm, Aspect ratio 18D) �Cutting condition vc : 70m/min fn : 0.18mm/rev �Tool life : 1000 holes, 105m
C6
G 23