Deep Hole Drill With Replaceable Tips

Deep Hole Drill With Replaceable Tips

A replaceable tip drill lets machinists dial in runout without dismantling the tool assembly, adding or removing shims to the tool turret, or relying on an experienced colleague’s unorthodox fixes.deep hole drill changeable tips Combined with offline presetting and attention to coolant and chips, these tools can leave holes straight and smooth enough to make dedicated finishing tools unnecessary.

According to Kennametal, a supplier of deep hole drills, replacing the drill tip with a fresh one can reduce exit burrs and improve tool life, especially for steels and cast irons.deep hole drill changeable tips The new tip may also eliminate end milling procedures, resulting in savings of time and money.

The company’s T-A drill line, for example, is available with a range of solid carbide tips that are shaped to the required dimensions of the drill body and designed for optimum performance in the application.deep hole drill changeable tips This ensures that operators receive a perfectly factory-ground surface or drill point each time, which can improve consistency and reduce the number of regrind operations.

The inserts that go into the replaceable-tip drills come in a variety of grades, with options for hardness and wear resistance to match the material being cut. Depending on the application, some tips feature a coating that is said to increase the wear resistance of the cutting edge, while others offer superior toughness for cutting speeds up to 14,000 fpm.

A tungsten carbide base, for example, is used to create the core of a T-A drill, which provides strength and rigidity to withstand the cutting forces generated by the tip. In addition, a coating like titanium nitride (TiN) or aluminum titanium nitride (AlTiN) is applied to the tip to enhance hardness and improve surface finishes in the drilled hole.

In addition to cutting edges, the replaceable-tip drills contain guide pads that help keep the tool centered and stable during drilling. The pads may be made of ceramic or carbide materials, such as alumina, zirconia, or titanium carbide. They are typically bonded to the tip with a high-strength adhesive.

The drills use a unique tip design to improve chip control, according to the manufacturer. Its four margin lands and asymmetrically arranged cutting edge corner distribute the cutting forces evenly across the entire drill face, reducing the possibility of the tool wandering or deviating from its desired position in the material being cut.

Another key feature of these deep hole drills is their ability to be indexed quickly and easily. When a cutting edge becomes dull, for example, indexing the replaceable-tip drill in the machine with its whip guides allows the operator to rotate the tip forward and expose a new cutting edge. This eliminates the need for tool changes and downtime, and it can even speed up the process compared to a brazed gundrill.

With a cautious approach, modern thinking and careful attention to the cutting tools and their setup, the potential of these replaceable-tip drills for deep CNC holemaking applications should be unleashed. These tips can help achieve a level of accuracy and consistency that will allow reliable tool life forecasting for the most demanding applications.

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