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Tech Tips for Machining Hardened Materials with Ceramic and CeramiX

1/12/2021

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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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Tough, Precise, and Fast —Carmex HBA carbide grade is available today for tomorrow’s materials

10/21/2020

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Carmex HBA Carbide Hard Threading inconcel titanium
As more applications require the use of super-hard alloys, manufacturers are demanding tooling that can deliver precision threads and high production in less time.

To meet these challenges, Carmex Precision Tools Ltd. has engineered carbide grade HBA — an extra-fine, submicron grade with high toughness for optimized performance on hardened steel Titanium and super alloys including Hastelloy, Inconel and Nickel base alloys up to 62 HRc.

Available for internal and external threading in both 60° and 55° partial profile, as well as ISO metric and UN, HBA delivers high wear and heat resistance and excellent edge stability. The unique combination of carbide substrate, coating type and edge conditions provide superior performance over extended tool life.

Case Study in Threading D2 at 53-56HRc

16 ER 1.5 ISO HBA
16mm (3/8" I.C.) LAYDOWN INSERT FOR ISO (METRIC) EXT-RH THREAD; PITCH: 01.50mm; GRADE: HBA
In a recent test involving an external right-hand thread:
  • Thread: M32x1.5 and a length of 65mm (2.56")
  • Material: D2 hardened steel @ 53-56 HRc,
  • Insert: 16 ER 1.5 ISO grade HBA
  • Results: Operated at 1772 IPM (45 m/min) at 28 passes produced 36 threads per corner.

Hard machining is increasingly becoming the rule rather than the exception in complex part production. Carmex HBA was engineered to meet the challenges inherent in threading hard materials while delivering high production and longer tool life. 

Bring us your most challenging hard threading applications and lets try  the new Carmex HBA engineered performance carbide .
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    Technical Support Blog

    At Next Generation Tool we often run into many of the same technical questions from different customers. This section should answer many of your most common questions.

    We set up this special blog for the most commonly asked questions and machinist data tables for your easy reference.

    If you've got a question that's not answered here, then just send us a quick note via email or reach one of us on our CONTACTS page here on the website
    email us

    Authorship

    Our technical section is written by several different people. Sometimes, it's from our team here at Next Generation Tooling & at other times it's by one of the innovative manufacturer's we represent in California and Nevada.

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Established 1995
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Next Generation Tooling
10240 Cavalletti Drive
Sacramento CA 95829
916.765.4227
Northern California
23 Maxwell Street
Suite B
Lodi, CA 95240
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22343 La Palma Avenue
​Suite 126
Yorba Linda, CA 92887
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