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Extra Long SUPER MULTI-DRILLs
MDW … XHT/PHT Type
Recommended Tooling Strategy
MDW … PHT
MDW … XHT
B A
A
DC
E
A a B: Preperation of pilot hole with MDW …PHT type
vc= 50-80m/min, f= 0,15-0,25mm/rev, doc:1-2xD
A a C: Entering into pilot hole with long Multi-Drill (MDW ….XHT type)
N= 500 rpm, vf =2000mm/min
At C the drill should stay (about. 3 sec.) and increase speed to set recommended cutting conditions.
C a D: Deep hole drilling
After reaching required number of revolution operation can be started taking into consideration mentioned
recommendation for the feed rates. At cross holes and irregular or angled surfaces feed should be reduced.
D a E: After hole drilling
Decrease spindle rotation to N=500~700rpm and pull back with high feed rate F= 2000 mm/min.
Application Examples
Work piece: Crank shaft (C45E, 1.1191) Tool life 200pcs
Machine Cutting edge after 66,4m drilling
Machine: Horizontal M/C
Coolant: MQL (Synthesized ester)
Air pressure 0,9MPa
Supplying rate 20cc/h
Process and cutting condition Multi-Drills
1) Pilot hole (5,75 x 12mm, Top angle of drill: 150°)
vc = 80m/min, f = 0,2mm/rev.
2) Deep hole (5,70 x 83mm x 4 holes, XHT type)
vc =100m/min, f = 0,15mm/rev. F = 873mm/min
Work piece: Connecting rod (C53,1.1213) Tool life 300pcs
Machine
Machine: Vertical M/C (BT40)
Coolant: Internal cooling (Emulsion)
Pump pressure 2,0MPa
Process and cutting condition Cutting edge after 39,0m drilling
1) Pilot hole (5,85 x 10mm, Top angle of drill: 175°) * Current tooling (with 5,8 x130mm gun drill)
vc = 80m/min, f = 0,05 g 0,15mm/rev.
2) Deep hole (5,80 x 130mm, XHT type) vc = 100m/min, f = 0,03mm/rev. F = 164mm/min.
vc = 90m/min, f = 0,20mm/rev. F = 988mm/min
( Tool life 120pcs )
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