Milling Easy solution for difficult-to-machine materials

Editor: Alexander Stark

UK — Tool manufacturer Dormer Pramet has launched a new generation of solid carbide five-flute end mills, specifically for dynamic milling in general machining and die and mould applications.

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The new additions — S722HB, S765HB and S768 — support most common operations.
The new additions — S722HB, S765HB and S768 — support most common operations.
(Source: Dormer Pramet)

The S7 assortment of solid carbide mills offered by Dormer Pramet covers a wide range of operations in a variety of steels, cast irons and difficult-to-machine materials, including stainless steels and super-alloys.

The latest additions, S770HB, S771HB, S772HB and S773HB, offer increased feed rates up to 25 percent, compared with four-flute cutters, the company states. All feature a positive rake angle for smooth cutting action and to reduce the risk of work-hardening.

An AlCrN coating provides thermal stability, reduced friction, excellent wear resistance and prolonged durability, while a small corner radius and cutting-edge design gives a stable performance and prolonged tool life.

The S771HB and S773HB cutters are suitable for narrow pocketing, trochoidal slotting and profiling applications. These end mills include a chip divider to break swarf into manageable smaller pieces, helping to reduce spindle load and increase metal removal rates. This provides a 50 percent bigger width of cut compared to tools without a chip divider. A neck recess helps avoid contact with the wall in shoulder operations, while through coolant improves welding resistance and enables a wide range of processes, especially for difficult-to-machine materials.

The S770HB and S772HB are more suitable for profiling, trochoidal slotting, and semi-finishing applications, offering maximum productivity due to optimal metal removal rate and reduced machining time.

Meanwhile, Dormer Pramet has added three multi-application high performance cutters within its S7 range for use on both CNC and conventional machine tools.

The new additions — S722HB, S765HB and S768 — support most common operations, such as slotting, plunging, contour milling, ramping and copy milling in various materials, including medium strength steels, stainless steels and super alloys.

These four-flute cutters have a specific tooth design for improved chip evacuation. The AlCrN and Titanium Silicon Nitride (TiSiN) coatings support longer tool life, higher cutting speeds and increased heat resistance, making them ideal for dry machining.

Finally, the global manufacturer has added a new solid carbide cutter to enhance its assortment of end mills for hardened steel above 49HRC. The S561 is specifically for high performance milling in a variety of applications, including die and mould machining. This four-flute end mill features a specific tooth design for improved chip evacuation. A sharp cutter for hardened steel (52-70HRC), the S561 offers excellent surface finishing, while a gash land to improve strength and chipping resistance.

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