High volume, dry milling development

Intended for high volume metal removal and in dry cutting conditions, the solid carbide, Ti1000 coated, MCR VHM rough milling cutters feature an unequal pitch and optimal geometry tuning, this combined with a positive face angle with integrated chip breaker, provides cutting edge stabilisation and short chips, the latter being easily evacuated using compressed air. With three cutter lengths available as standard, coupled with a reduced neck, the MCR VHM series is truly universal in application and can be applied to a wide range of materials such as short and long-cutting steel, Chromium steels and hardened steel to 42HRC, in addition, it is equally at home machining cast irons, bronze, copper and similar materials. The application area also includes ramping, full slotting, interpolating and side cutting, all of which can be accomplished at elevated metal removal rates due to the geometry generating a reduction in cutting pressure between 20 and 25 %, and the efficiency of the titanium-based Ti1000 coating. For example, machining CrMo (1,2312) tool steel a metal removal rate of 305.7 cm3/min running at a surface speed of 200 m/min and a feed rate of 3057 mm/min using a 10 mm diameter cutter. For optimum performance WNT recommends that the tool is run dry with the application of compressed air at a pressure of 6-bar to provide swarf evacuation and cutter cooling. This can be provided by using the Cooljet system available from WNT (UK), which uses a blast of chilled air to remove swarf and to keep component and tool at a controlled temperature. While it is in the interest of the cutter to run it dry this process also has definite cost and environmental advantages.