FEEDS & SPEEDS

[stingray69]

Hi there .This is not really a mastercam topic but i need so i thought i just ask anyways.

I am trying to machine a small bore (approx 38mm) with a shouler in the back in duplex.I can seem to acheive chip breakage therefore have problem with evacuation thus breaking insert and seat on bar.Has anyone machined this material and can give me an ideal starting point for feeds and speeds used

Thank You all for your support

[Guest]

Well, I just found this in a google search

 

quote:

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Duplex stainless steels, such as EN 1.4462, are generally more difficult to machine than conventional austenitic steels and have different machining properties than those of high-alloy austenitic steels. The main difference is that duplex steels are relatively easier to machine with high-speed tools than with cemented carbide tools compared to austenitic stainless steels with similar alloy content. For more detailed information on machining please refer to ”Cutting data recommendations for EN 1.4462”, which can be obtained on request.

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Linky

 

 

quote:

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Machinability

 

Although machinable, the high strengths of duplex stainless steels makes machining difficult. As an example, machining of 2205 is around 20% slower than for 304.

 

Machining can be enhanced by using the following rules:

 

· Cutting edges must be kept sharp. Dull edges cause excess work hardening.

 

· Cuts should be light but deep enough to prevent work hardening by riding on the surface of the material.

 

· Chip breakers should be employed to assist in ensuring swarf remains clear of the work

 

· Low thermal conductivity of austenitic alloys results in heat concentrating at the cutting edges. This means coolants and lubricants are necessary and must be used in large quantities.

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Linky 2

[Lars Christensen]

I do not know how much this is going to help you, but I had to machine this stuff a couple of years ago, and started this thread.

Link

 

Good luck

[stingray69]

Just wanted to say thanks guys