Sandvik Coromant Heat resistant super alloys - Manual (Page 11)

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2. Turning of nickel-based materials
– aerospace engine and stationary gas turbines
Classification of machining stages
The production cycle for the machining of a HRSA component can be broken into three dis-
tinct stages, each with specific demands on the tooling and the machined surface.
FSM – First stage machining – up to 10 mm depth of cut
The forged components often have rough,
uneven skin or scale. They are generally
machined in the soft condition (the hard-
ness is typically 26 HRC) at the foundry
to the basic component shape. Coated
carbide grades are used at high feed rates,
large depths of cut and low speeds.
Ceramics may also be used with good
machine and forging conditions. Here the
main priorities are productivity and large
stock removal – in the total machining proc-
ess, up to 80% of the original weight will
be machined away, and the bulk of it will be
removed during FSM.
The component shapes are simple and
standard general turning tool holders can
be used. Many critical parts have a ring
removed at this stage for material analysis.
CoroCut insert in geometry -TF and grade
GC1105 is outstanding for this operation.
Material to be
removed