his is an expansion its solid carbide drilling portfolio and is for high performance, large volume drilling in steel. Designed to quickly and efficiently punch holes up to 8xD in any ISO-P steel material, the HPX drill provides up to twice the tool life and three times the productivity, compared to competing products, even in dry or minimum quantity lubrication (MQL) applications, Kennametal asserts.
The performance difference is in the design. Steels are used for a wide variety of automotive, commercial and industrial applications, often in production volumes where maximum tool life and throughput is critical. Yet steel creates a high degree of mechanical loading during drilling operations, resulting in forces that lead to rapid tool wear and chipping of the tool´s more vulnerable corners. Kennametal has eliminated this failure point by applying a small corner chamfer and straightening the HPX drill´s cutting edges. Together with the rounded margin lands running down the length of the flutes, this serves to stabilizs the drill while reducing friction.
Built-up edge is another common problem when drilling alloy steels. The HPX drill´s straight cutting edge helps eliminate some of this, but the real clincher is the drill´s optimised edge preparation. This gentle hone further reduces the friction that leads to built-up edge, as do the tool´s highly polished flutes. Coupled with a carbide grade designed specifically for steel—KCP15B—and a proprietary multilayer AlTiN coating, and the HPX drill sets a new standard for tool life in high-volume ISO-P drilling, the tool specialist says.
Special gashing on the HPX drill improves the chip formation and curls a smaller chip. The material-specific HPX point geometry creates significantly lower cutting forces, which works well for machines having lower spindle capabilities, in unstable cutting conditions, or where unstable workpiece clamping occurs. A continuous cross section makes the HPX drill more resistant against tool breakage and the ultrahigh polished chip flutes ensure superior chip evacuation.
For dry cutting or MQL systems, efficient chip evacuation along with low-friction cutting is a must, and the HPX drill delivers on both counts. In fact, the drill comes equipped with a leakproof MQL interface that meets DIN 6535 and 69090-03 standards—no more special orders or in-house modifications.