Compared to inserts that are coated using the conventional chemical vapour deposition (CVD) process, Walter’s new Tiger.tec Gold inserts additionally boast higher wear resistance on flank faces, reduced hairline cracking, a greater resistance to plastic deformation plus improved process reliability.
The inserts will initially be available in the WKP35G grade for milling steel and cast iron; other grades will follow.
In numerous tests at cutting speeds between 120 m/min and 320 m/min on various grades of steel and cast iron, the Tiger.tec Gold WKP35G inserts not only demonstrated extended tool life but also higher wear resistance on flank faces and improved resistance to plastic deformation.Tool life increases of up to a staggering 200% have been achieved.
The new development has been achieved by using TiAlN with a significantly high aluminium content of 85% in combination with a new ‘ultra-low pressure’ CVD process. A gold-coloured coating results, ideal for tool wear indication.
Titanium nitride (TiN) is used as both a key between the carbide base substrate and the TiAlN coating, and as the top, textured layer (above the main coating). The ultra-low pressure CVD process subjects the inserts/coatings to compressive residual stress rather than tensile residual stress, which underpins the benefits witnessed.
