Article From: 8/15/2008 Production Machining
Precision Dormer's CDX-Inox drills are designed for drilling stainless steels and exotic alloys to depths of 3× diameter and 5× diameter. To combat the work hardening commonplace when machining stainless steels, the drills have a thin margin, which reduces contact with the hole surface. This minimizes friction between the drill cylindrical land and the hole walls, decreasing work hardening and generated temperatures.
Because of the high toughness of stainless steel, problems associated with chip breaking and evacuation are also common, according to the company. The positive geometry and coolant feed holes of both drills ensure excellent chip management, allowing the tools to perform at high feed rates while minimizing machine downtime, the company says.
Several elements are designed to enhance tool life: The smooth, curved design of the cutting edge results in a uniform wear pattern; the 140-degree point promotes excellent centering and ensures that thrust forces exerted at high penetration rates are low; improved TiAlN-Top multi-layer coating resists built-up edge and allows the drills to operate at high speeds, the company says.