5 common questions about CBN inserts along with their answers
1. What is the optimum cutting speed for CBN inserts?
The optimum cutting speed depends on the type of material being machined and the specific specification of the insert. Generally, CBN inserts are suitable for high cutting speeds, typically ranging from 100 m/min to 400 m/min. It is recommended to refer to the technical manuals provided by the insert manufacturer for optimal cutting parameters.
2. How can I extend the service life of CBN inserts?
Ways to extend the life of CBN inserts include:
- Selecting the proper cutting speed and feed rate to avoid overloaded cutting.
- Use appropriate coolant to reduce the cutting temperature.
- Regularly check the wear condition of the inserts and replace them in a timely manner.
- Ensure proper installation of the inserts to avoid vibrations and instability during cutting.
3. What materials are CBN inserts suitable for?
CBN inserts are particularly suitable for machining hard materials such as hardened steel, hardened alloys, cast iron and certain high temperature alloys. They perform well in the cutting of these materials, providing excellent wear resistance and surface finish.
4. How is the cutting performance of CBN inserts assessed?
The cutting performance of CBN inserts can be assessed in the following ways:
- Cutting efficiency (cutting speed, feed rate and depth of cut).
- Tool wear (e.g., tip wear, bit wear, etc.).
- Machined surface quality (e.g. surface roughness and dimensional accuracy).
- Tool life (usage time and cutting length).
5. How to deal with worn and broken CBN inserts?
For worn CBN inserts:
- Replace inserts promptly when wear reaches the limit of tool life to ensure machining quality.
- If the insert has minor wear, consider resharpening (if applicable).
For broken CBN inserts:
- Discontinue use immediately and check the cause (e.g. improper cutting parameters or equipment failure).
- Record the broken insert and analyse the cause to avoid the same problem in the future.
With answers to these common questions, users can better understand the use and maintenance of CBN inserts to improve machining efficiency and tool life.
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