High-Efficiency 7075-T6 Aluminum Milling with 3-Flute DLC End Mills
Optimizing metal removal rates (MRR) in 7075-T6 aircraft aluminum utilizing 3-flute 45° variable helix carbide end mills with DLC non-stick coating and high-feed dynamic pocketing.
Engineering Specifications & Parameters
Coating
DLC (Diamond-Like Carbon) / ZrN
Chip Load (fz)
0.15 - 0.28 mm/tooth
Cutting Speed (Vc)
400 - 750 m/min
Axial Depth of Cut (ap)
Up to 3x Tool Diameter (3D)
Metal Removal Rate (MRR)
Up to 1500 cm3/min on 20 kW spindle
Radial Depth of Cut (ae)
10% - 20% Tool Diameter (Dynamic HEM)
Dynamic High-Efficiency Milling (HEM) in 7075-T6
7075-T6 aerospace aluminum offers high hardness (150 HB), allowing aggressive radial chip thinning toolpaths without chip welding when paired with high-performance coated carbide.
Optimal 3-Flute Cutter Geometry
3-Flute Balance: 3-flute end mills offer 50% higher core rigidity than 2-flute cutters while preserving ample chip pocket volume for deep slotting.
45-Degree Variable Helix: Disrupts resonant harmonics, suppressing chatter in deep pockets up to 4D depth.
Radial Engagement (ae): 10% to 20% of tool diameter with full axial depth (ap = 2D to 3D).
Frequently Asked Questions
Why is 3-flute end mill geometry the industry standard for 7075 aluminum?
It provides the optimum cross-sectional core stiffness needed to avoid deflection while maintaining large chip gullets for rapid chip evacuation at 15,000+ RPM.
What is the benefit of dynamic radial chip thinning toolpaths in aluminum?
By maintaining a light radial engagement (15% ae), the actual chip is thinner than feed per tooth, allowing 2x higher table feed and spreading wear across the entire flute length.
