What Are CNC Bit Coatings?
CNC bit coatings are thin layers of material applied to the surface of the cutting tool. They’re designed to protect from wear, corrosion, and heat–reducing friction and improving chip evacuation. This can enhance cutting speed, accuracy, and surface finish while also increasing tool life.
Benefits of CNC Bit Coatings
CNC bit coatings are used to improve the performance and longevity of cutting tools. They can increase tool life, improve surface finish, allow for higher cutting speeds, and resist corrosion.
Types of CNC Bit Coatings
Just like there’s different types of paint for different types of materials, There are several types of CNC bit coatings and each serve a purpose for different applications. Basically, there are 2 kinds of thin film deposition, Physical Vapor Deposition (PVD), and Chemical Vapor Deposition (CVD)
Some popular coatings are:
-Titanium Nitride (TiN) coatings are gold in color. They are the most commonly used coating because the ceramic base is hard and heat resistant.
-Titanium CarboNitride (TiCN) coatings are harder than TiN, and create less friction with most materials, so you’ll want to use these when you cut aluminum and other gummy metals.
-Chromium Nitride (CrN) coatings are silvery and metallic. These coatings offer similar benefits of TiCN, such as creating less friction, but the coating can get hotter than TiCN and still maintain its innate qualities and better lubrication qualities.
–Aluminum Titanium Nitride (AlTIN or TiAlN) coatings are normally dark gray in color. They’re normally used when the job is too hot for Titanium Nitride coated tools, because it’s harder and can maintain this hardness at higher temperatures than Titanium Nitride coated tools. This is perfect for cutting steel.
–Titanium Aluminum CarboNitride: You’ll be able to identify Titanium Aluminum CarboNitride (TiAlCN) by its pink coating. This coating is a nano coating, which means it’s extremely hard, and can be used at high temperatures and still yield low friction.
-Zirconium nitride (ZrN) are gold in colour and coated tools are suited to non-ferrous metal applications like the machining of aluminium alloys, brasses, copper alloys and titanium
– Aluminum Titanium Nitride + Silicon Nitride nACo coating is a micro-thin ceramic coating which enables the tool’s cutting edge to retain crucial sharpness and lubricity.
How to Choose the Right CNC Bit Coating
When choosing a coating for your CNC bit, it is important to consider the application. The material you will be cutting and the cutting parameters (feed rate, depth of cut and spindle speed) must be taken into account when evaluating coatings. Additionally, environmental conditions such as temperature and humidity may impact your choice of coating. It’s important to consider the properties of each individual coating before making an informed decision about which one best meets your needs. Finally coatings were designed to help CNC bits machine a wider range of metals and alloys because of the wide range of material hardness and temperatures created when machine. Where some coating maybe be slightly beneficial when machining to extend tool life for the most part the are not required.
Advantages of Using CNC Bit Coatings
- Increased tool life
- Improved surface finish
- Higher cutting speeds
Resistance to corrosion
- Improved chip evacuation
- Reduced tool wear and cutting forces, which results in less vibration and chatter. This leads to increased productivity and reduced costs associated with machine downtime or repair. In addition, the thermal conductivity of a CNC bit coating allows it to transfer heat away from the cutting edge more efficiently than uncoated carbide tools do, which means you can run your machine at higher speeds without damaging its components or causing excessive heat buildup within the tool itself.