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Tech Tips for Machining Hardened Materials with Ceramic and CeramiX

1/12/2021

29 Comments

 
Machining Hardened Materials with Ceramic
Here are some simple quick tips when you are machining machining hard materials. 
  • As material hardness goes up the SFM goes down.
  • Use the strongest possible insert shape to maximize insert strength.
  • Ceramic is a hard material therefore, the insert needs some edge preparation in order to withstand cutting forces and optimize performance.
  • Utilize positive geometries for close tolerances or thin-walled parts.
  • If multiple passes are required with one edge, vary the DOC to move the wear on the insert edge and improve tool life.
  • If you encounter chatter, increase your feed rate. Heavy chatter is often a sign of the tooling being above centerline or there is too much toolholder overhang. The machine, part and tooling set-up must be rigid.
When you're considering inserts from NTK Cutting Tools for hard turning, take a look at the grades and styles.
  1.  Light edge preps T styles ( T-land:  T0425  & T0525)
  2.  Heavy edge preps:  Z and S style ( T-land and honed edge: Z0820, Z0825, S0820, S0825) or  J, P, and Q style (Double Chamfered and Honed edge: P4815,  P8015, Q8015)
NTK hard Turning SFM Speed chart based upon material hardness
Hard Turning Speed SFM chart based upon a material's Shore Hardness.. As the hardness increases the SFM decreases.
Hard Turning IPR Feed Rate based upon ceramic insert nose radius and DOC
Some good rules of thumb for Hard Turning: The IPR Feed Rate is based upon ceramic insert nose radius and Depth of Cut (DOC)
Hard Turning SFM IPR chart Speed Feed
Best choice of ceramic insert grades for use in hard turning from NTK
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I didn't know about the SFM. My office needs to add a couple of cubicle spaces in the building. We'll have to talk to a contractor about the floor plan.

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