Test sites report better than predicted metal removal rates using Mitsubishi VFX 5 titanium alloy milling tools

Mitsubishi Carbide's VFX cutter bodies are manufactured from 42 CrMo4 steel, chosen for structural rigidity and integrity even when subjected to high loads and temperatures. They have a novel system of internal coolant holes with changeable exit nozzle diameters that can be selected according to the coolant pressure available and the required level of chip evacuation. The insert pockets have been designed with a large axial contact face and double shallow V formation radial contact points to ensure overall clamping strength, high repeatability of insert positioning and for optimal dispersion of loads. These Mitsubishi Carbide MP9030 grade inserts are PVD coated using an accumulating coating method based on a Ti compound. Combined with a substrate that provides a balance of wear and lower cutting resistance, the inserts can deliver the performance and lower cutting resistance suitable for successful milling of titanium alloys. The cutting edge geometry, featuring a multi-stage convex rake face, aims to emulate that of a solid type carbide end mill and therefore achieves a higher than normal standard of wall finish, says Mitsubishi Carbide. A cutting action of this power requires the insert to be anchored securely. This is achieved with a larger than normal TS450 screw that can be tightened to a recommended torque of 5.0 Nm to make the most of the double V-formation and large face pocket clamping area. Additional inserts are now also available for the VFX6 series in a range of corner radii from 1.2 to 5.0 mm in two different chip breaker styles: MS and HS for medium and heavy applications respectively.