New Milling Concept From Sandvik Coromant Optimizes Aluminium Machining
Sandvik Coromant, a global leading supplier of cutting tools, tooling solutions and know-how to the metalworking industry, introduces RAL90, an innovative tool for machining aerospace components made of aluminium and aluminium alloys. The new milling concept for machining operations on high-speed spindles has a high-strength tempered base body that increases tool flexural stiffness and natural frequency. Thanks to its high-speed stability, RAL90 allows manufacturers of challenging aero structure components made of aluminium copper, aluminium silicon, aluminium magnesium, aluminium zinc and aluminium lithium alloys to achieve excellent metal removal rates.
An optimally designed, high-precision insert seat with seat numbering ensures a maximum runout accuracy of 20 microns axially and 15 microns radially, a feed rate of 0.3 mm/tooth and cutting depths of up to 14 mm. In addition, RAL90 secures inserts with a specially engineered, high-strength screw (M4, 5.0 Nm tightening torque). (Sandvik Coromant Unveil Small Thread Milling Cutter Range)
The new insert geometries with polished surfaces are designed for maximum metal removal rates during roughing and semi-finishing operations. To guarantee a defined chip formation in the recut, the inserts provide a double remote entering angle on the inner front side – ideal for linear and circular ramping without having to reduce the programmed feed rate. The inserts can be employed with nose radii (0.5, 0.8, 2.0, 2.5, 3.1, 4.0 and 5.0 mm) specified for the aerospace industry with no need to modify the cutter or alter programmed tool length.
RAL90 is prepared for minimum quantity lubrication and high-pressure coolant (with replaceable nozzles). As standard the tools are supplied with a balancing quality of G6,3 (at 24,000 rev/min) or, by customer request, of G2,5. Depending on diameter, speeds up to 35,000 rev/min are possible. RAL 90 is available with cylindrical shank, screw coupling, HSK63A holding and TDA interfaces.
