First indexable drill for 7xD hole depth

The CoroDrill DS20 from cutting tool and tooling system specialist Sandvik Coromant is said to be the first indexable drill concept capable of producing hole depths up to 7xD.

Replacing the existing CoroDrill 880 and CoroDrill 881 tools, 4-5xD CoroDrill DS20 indexable drills provide tool life improvements of up to 25% and productivity gains up to 10%, depending on workpiece material, reports Sandvik Coromant. However, the 6-7xD variants represent an entirely new capability range of indexable drills. To complement the introduction, the company is releasing a new Modular Drilling Interface (MDI) that acts as a coupling between the drill and adaptor. Available in Coromant Capto and HSK shank types, the MDI provides high precision, good centring capabilities and reduced tool inventory.
“Among the most important factors when drilling to depths of more than 5xD is controlled cutting forces, secure chip evacuation and high centring capabilities,” explains Håkan Carlberg, senior R&D engineer – indexable drilling at Sandvik Coromant. “Going from a 5xD to a 7xD drill, the theoretical difficulty increases approximately three-fold due to an increased inclination to bend. Designing a CoroDrill DS20 7xD drill requires careful consideration for around 50 parameters that all depend on each other. The outcome is improved process security through lower forces and lighter cutting, particularly at entry. In turn, users achieve lower cost per hole, the ability to drill deeper and reduced sound levels.”
The drill body is strong and fatigue-resistant with higher levels of stiffness than ever achieved before, while chip flute shapes are individually designed for each drill size and insert. This combination of factors leads to less vibration, predictable wear patterns and increased tool life.
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