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Wing

The main challenges for machining these types of structural components are the hole making, edging and surface machining. ​

 

​Application examples

 
 

​Hole making in CFRP

Facts and demands
  • Resin rich material
  • Electrical or pneumatic versions
  • Minimal delamination of fibres
  • Good surface finish and dimensions
  • CNC machining centre
Solutions
  • CoroDrill 854 drill point, diameter 6.35 mm (0.250 inch)
  • N20C diamond coating
Cutting data
  • VC: 130 m/min (495 ft/min)
  • fn: 0.05 mm/rev (0.002 inch/rev)
Benefits
  • Excellent hole quality, minimal delamination
  • 800 hole tool life
  • Good hole production economy

 








​Sturtz milling: profiling of carbon fibre

Facts and demands
  • Tilting of tool 2-10 degrees- High rpm and feed rate
  • Primary structure carbon fibre
  • Hand held pneumatic machine design
  • 2D and 3D feature solutions
  • Good surface finish and dimensions
Solutions
  • CoroMill 390
  • Cutter: R390-032A32-11H
  • CD10 PCD inserts (3 mm (0.118 inch) modied radii)
  • Cutting data
  • Vf: 1800 mm/min (70.866 inch/min)
  • 2 mm (0.079 inch) depth of cut
  • 5 degree sturtz angle
  • fz: 0.2 mm/tooth (0.008 inch/tooth)

Suitable process for large areas of shallow curvature, i.e. many aircraft wing and fuselage components.

 

Ball end scanning Vs Sturtz

32 mm (1.260 inch) diameter tools used with the same cutting data. 
32 mm Ball​
32 mm Sturtz​
Surface Speed, m/min​
(ft/min)
2011​
(6597.69)
​2011
(6597.69)
RPM​ 20000​ ​20000
Feed/tooth, mm/min​
(in/tooth)
0.12​
(0.005)
0.12​
(0.005)
Table feed, mm/min
(in/min)
12000​
(472.441)
12000​
(472.441) 
No of flutes​ 5​ 5​
Step over, mm
(in)
3.52​
(0.139)
11​
(0.433)
Passe/Sq Metre​ 284​ 91​
Time for 1 Sq Metre​ 23.7​ 7.6​
Over 3 times faster generating the surface
 
Typical to use smaller ball end tools resulting in even greater productivity when switching to Sturtz techniques.
 
 


Surface machining of carbon fibre

Facts and demands
  • Primary structure carbon fibre
  • Minimal splintering of fibres and delamination
  • Good surface finish and dimensions
Solutions
  • CoroMill Century with PCD inserts
  • Cutter: R590-04C3-11M
  • Inserts: R590-1105H-PS2-NL CD10
Cutting data
  • Cutting speed: 300 m/min (984.24 ft/min)
  • Fz: Roughing: 0.16 mm/tooth (0.006 in/tooth) / Finishing: 0.1 mm/tooth (0.004 in/tooth)
  • AP: Roughing: 2.5 mm (0.098 in/tooth) / Finishing: 0.5 mm (0.020 in/tooth)

 

 

CoroMill Century

 
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