Dry turning insert offers high productivity
1 min read
The latest development from LMT Boehlerit's specialist carbide and coating division is targeted at users requiring higher productivity when rough and finish turning cast iron materials under dry cutting conditions.
As a result, proving trials involving the new Casttech LC610H grade of turning insert, available from LMT (UK) of Coventry, have shown that the tooling can be run without coolant at speeds of up to 500 m/min.
The advantage of the new insert is the combination of a hard substrate with a special chip breaker and coating that ensures control over the formation of chips while reducing the levels of friction. The TiCN-TiC coating is combined with aluminium oxide which helps create the ultimate surface hardness giving new levels of durability under harsher cutting conditions. This minimises the onset of cratering on the top of the insert and the build up of thermal stress that is a problem especially when machining without coolant.
The LC 610H insert grade has been demonstrated at cutting speeds of up to 500 m/min on pearlitic cast iron (180 HB) with a depth of cut between 0.05 and 0.25 mm and 300 m/min at feed rates between 0.8 and 0.04 mm. Grey cast iron (260 HB) can be machined at up to 270 m/min at depths of cut up to 0.25, nodular graphite iron (250 HB) at 200 m/min and malleable cast iron (230 HB) at 240 m/min.
Due to the combination of coating and substrate, the Casttech LC610H insert also has the stability for use under interrupted cutting conditions.
