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LMT has launched a range of Supertec turning inserts for normal and interrupted cutting of super alloy materials.

The inserts allow cutting speeds to be increased by up to 15 per cent and tool life to be improved by between 30 and 50 per cent.

The Supertec LC405Z and LC415Z inserts, developed for turning high-temperature alloys, combine a submicron substrate for higher machining stability with a high-temperature supernitride coating that enables greater cutting speeds to be achieved with improved thermal stability.

A positive macrogeometry and sharp-edge microgeometry improve chip breaking.

The inserts give improvements in cutting life between 30 and 50 per cent while enabling the cutting speeds to be increased by up to 15 per cent.

There are two turning grades and each grade is available with three styles of chipbreaker.

Positive macro geometry ensures a smooth chip flow and a hard metal layer acts as a heat shield.

From its tests, Boehlerit found a thin, high temperature resistant super-nitride coating gave the most impressive performance at higher cutting speeds due to the higher thermal loading tolerated by the coating.

Also, by incorporating a high aluminium content in the fine crystal structure, ‘in-cut’ life improved when machining any high-temperature-resistant alloys.

Within the LC405Z and LC415Z insert range are three geometries: Fine Medium Superalloy (FMS), Medium Superalloy (MS) and Medium Roughing Superalloy (MRS).

FMS provides a capability to machine with a depth of cut between 0.5 and 4mm with a feed rate of 0.06 to 0.25mm/rev on Inconel and titanium type superalloys while MS, with its sharp geometry, is suitable for any superalloy with a 1 mm to 3.2mm depth of cut and 0.1 to 0.32mm/rev feed rate.

The MRS geometry is suitable for interrupted cutting of stainless steels and special alloys with a depth of cut between 1.2 and 6.2mm and feed rate between 0.16 and 0.4mm/rev.

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