Parting and grooving aluminium and non-ferrous materials
Non-ferrous metals are softer types of metals such as aluminium, copper, brass etc. Aluminium with a silicon content (Si) of 13% is very abrasive. Generally, high cutting speeds and long tool life can be expected for inserts with sharp edges.
To achieve these sharp edges as on geometry -RO, the edge line usually has to be ground and the carbide needs to be uncoated, or have a thin coating.
For components demanding an extremely high surface finish, a polycristalline diamond (PCD) tipped insert is recommended. It provides the possibility for using high cutting data and ensures long tool life.
Parting and grooving heat resistant super alloys (HRSA)
HRSA falls into three groups; nickel-based, iron-based and cobalt-based alloys. The physical properties and machining behaviour of each group varies considerably. Whether the metal is annealed or aged is particularly influential on the subsequent machining properties, as the hardness varies from 150 to 440 HB.
The machinability of HRSA is generally poor compared to both general steels and stainless steels. Preferable insert geometries for HRSAs are -GF and -TF For higher cutting speeds, a ceramic insert will drastically improve productivity.
Parting and grooving titanium alloys
Titanium alloys are typically machined in the annealed or solution treated and aged conditions, when hardness can vary between 250-440 HB.
The machinability is poor compared to both general steels and stainless steels, which imposes particular demands on the cutting tools.
We recommend inserts with sharp edge -GF geometry in an uncoated grade.
To achieve good chip-breaking in long-chipping materials, such as titanium alloys, and to prolong tool life, we recommend installing a high pressure coolant in the machine.
Hard part machining
Modern manufacturing technology places increasing demands on components to be made in one set-up, creating the need for machining hardened components. Cutting tool materials such as CBN (cubic boron nitride) act as a productivity booster when turning is used instead of grinding. Both hardened, and induction hardened components with hardness between 50–65 HRc can be machined.
We recommend inserts with -S geometries for grooving and -RE for profiling. For smaller holes, CBN-tipped grooving inserts are recommended. They are suitable for both continuous and interrupted cuts and designed to achieve good surface quality and to keep close tolerances.