EMO 2019: September 16-21 Hall 5, Stand B06 | First insert drill bit for 7xD hole depths

CoroDrill® DS20 insert drill bit offers reliability and predictability for extended tool life in 4-7xD applications

The CoroDrill^® DS20 from cutting tool and tool system specialist Sandvik Coromant is the first chuck drilling concept capable of producing hole depths up to 7xD. The drill, which includes complete new designs for both the drill body and the change plates, provides users with reliable and predictable chip control and excellent penetration values in all 4-7xD applications.

Replacing the existing CoroDrill 880 and CoroDrill 881 tools with the 4-5xD CoroDrill DS20 inserts results in tool life improvements of up to 25% and productivity improvements of up to 10%, depending on the workpiece material. The 6-7xD variants represent a whole new range of insert drilling capabilities from Sandvik Coromant. To complement the introduction, the company is introducing a new Modular Drilling Interface (MDI) that acts as a coupling between the drill bit and adapter. Available in Coromant Capto^® and HSK shank types, the MDI offers high accuracy, excellent centering capabilities and reduced tool stock.

CoroDrill^® DS20 insert drills are both versatile and cost-effective, increasing tool life and productivity in virtually all workpiece materials compared to current best-in-class concepts. Pilot hole drilling is not required.

"The most important factors when drilling depths greater than 5xD include controlled cutting forces, sure chip removal and high centering capabilities," explains Håkan Carlberg, Senior R&D engineer insert drills at Sandvik Coromant. "When going from a 5xD to a 7xD drill bit, the theoretical difficulty increases about three times, due to an increased tendency to bend. Designing a CoroDrill DS20 7xD drill requires careful considerations with respect to approximately 50 parameters, all of which depend on each other. The outcome offers process reliability through lower cutting forces and lighter cutting, especially at entry. In turn, users get lower cost per hole, the ability to drill deeper and lower geIuid levels."

The drill body is strong and fatigue-resistant with higher levels of rigidity than ever before achieved, while chip grooves are individually designed for each drill size and insert. This combination of factors results in reduced vibration, predictable wear patterns and increased tool life. In addition, next-generation "double-step" (double-step) technology reduces entry cutting forces by up to 75% compared to CoroDrill 880 tools for improved centering capabilities. Strong change plate design and bulk toughness provide additional robustness, with four true cutting edges on both center and circumferential change plates.

As for the new MDI, double centering with high fitting accuracy allows for good concentricity and optimum repeatability. Here, flange and surface contact between the drill body and the nut provides increased stability and promotes hole quality. One size can be used for different drilling diameters.

CoroDrill DS20 insert drills are available from 15 to 65 mm in diameter with a selection of shank types, grades and geometries for all material types and applications, including those found in general engineering, automotive, oil and gas, pump and valve, and aerospace sectors.

Find out more at https://www.sandvik.coromant.com/nl-nl/products/corodrill_ds20/