What is PVD coating for cutting tools
In modern CNC machining, the performance of cutting tools depends not only on their geometry but also on the type of coating applied to the tool's surface.
One of the most widely used technologies in the industry is PVD (Physical Vapor Deposition) coating. This technology allows the application of extremely hard, micron-thick layers that improve the tools' resistance to wear and temperature.
What PVD means
PVD is an industrial process in which a solid material is vaporized in a vacuum chamber and deposited as a thin layer on the tool's surface.
This layer can have a typical thickness of 1 to 7 microns, but it offers superior mechanical properties to the base material.
PVD layers are designed to improve:
• wear resistance
• temperature resistance
• friction coefficient
• machining stability
Why coatings are important for tools
During the cutting process, tools are subjected to extreme conditions:
• very high temperatures
• high pressures in the cutting zone
• continuous friction with the workpiece material
Without adequate coating, tool wear would be much faster.
PVD coatings act as a protective layer that reduces friction and protects the carbide or HSS substrate.
Common types of PVD coatings
Several types of coatings are used in the cutting tool industry.
Among the most widespread are:
TiAlN (Titanium Aluminum Nitride)
Very resistant to high temperatures and frequently used in milling and drilling.
AlTiN / AlTiSiN
Modern coatings with high resistance to oxidation and wear.
nACo
Nano-composite coating based on aluminum, titanium, and silicon, used for high-performance applications.
TiXCo
nACo-based coating with a top layer of Titanium Silicon Nitride, recommended for difficult applications in tool steels.
DLC (Diamond Like Carbon)
Coating with a very low friction coefficient, used for aluminum or non-ferrous materials.
Advantages of PVD coatings
Applying the correct coating can bring multiple benefits:
• increased tool life
• reduced friction during cutting
• better resistance to high temperatures
• greater stability of the machining process
In many cases, the lifespan of a coated tool can be several times longer than that of an uncoated tool.
Recoating tools after reconditioning
After regrinding carbide tools, the original coating is removed during the grinding process.
To restore the tool to maximum performance, a PVD layer needs to be reapplied.
This process allows for the reuse of worn tools with performance comparable to that of a new tool.
PVD coatings for reconditioned tools – Sefira
SEFIRA offers PVD recoating services for carbide and HSS cutting tools.
The most common coatings provided:
• nACo
• TiXCo
• DLC
These are applied under controlled industrial conditions to ensure high adhesion and consistent performance in production.
Do you have worn tools?
If you have carbide tools that require reconditioning and recoating, the Sefira team can analyze them and send you a quick quote.
📧 info@sefira.ro
📞 +40 712 333 902
More information about services can be found on www.sefira.ro