Hole requirements – Sandvik Coromant Machining carbon fibre materials User Manual
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Hole requirements
Stacked materials
Common demands
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Cpk>1,33
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Ra<3,2 in carbon fibre
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Ra<1,6 for Aluminium and titanium
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Hole tolerance: +/- 20 µm to +/- 40 µm
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No delamination or chipping in the hole exit
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No chip erosion on the carbon fibre from the metallic stacked material
Criteria
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Chips evacuation
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Lubrification through the center
Dimension control
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Holes are commonly pre-drilled
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Finish hole size produced with one shot solution if possible
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Reamer to be used when high demands on finish and size control
Holes are usually measured as diagram shows above every 90 degree
Material 1
Material 2
2 mm in from Entrance
Middle of material
2 mm from Exit
2 mm in from Entrance
Middle of material
2 mm from Exit
SANDVIK COROMANT USER’S GUIDE - COMPOSITE SOLUTIONS
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