New geometries boost LMT Steeltec performance

RP geometry has a totally new, optimised 'chip-channel', developed for arduous roughing cycles, while the MP geometry incorporates a 'stabilisation' chamfer along with an improved Drytec heat dissipation surface, for more universal turning requirements. RP is a negative indexable insert that features a special micro geometry 'chip-channel' that creates a very soft chip-breaking scenario when taking roughing cuts, which reduces the power required from the machine under heavy duty cutting conditions. On a recent trial, machining the face of a turbine disc at 70 m/min with 10 mm depth of cut and 0.8 mm/rev feed rate, tool life of the Steeltec insert was raised above the incumbent insert supplier by 33 per cent; from 45 mins per corner to 60 mins. RP inserts can be applied with feed rates between 0.45 and 1.2 mm/rev; depths of cut between 3.5 and 12 mm; and cutting speeds between 30 and 200 m/min. Ther universal MP geometry combines a 'stabilisation' chamfer with optimised micro geometry that prevents chip impact under cut, and especially when turning against a shoulder. The micro geometry also prevents cratering of the insert and reduces friction enabling the flexibility of applying a wide range of feed rates to be used to tailor the process for the most productive solution. By incorporating the Drytec heat dissipation surface, which is increased by some 200 per cent over previous LMT Steeltec inserts, and is ground on both location faces of the insert after coating, this further improves the dynamic performance and enhances smoother cutting characteristics with the virtual elimination of any vibration under cutting conditions. MP inserts can be applied with feed rates between 0.15 and 0.45 mm/rev; depths of cut between 1.5 and 4.5 mm; and cutting speeds between 60 and 300 m/min.