how to turn nitrated-steel cylinder for repair job?

[spekkie]

I’m having problems to get a sufficiently smooth surface and trouble with very short toollife.Tried ceramic inserts and diamondtipped.Material to be turned are injection-cylinders used to inject dies with thermoplastics at very high pressure.Size is upto 4000×300×140mm(lenght×outer×inner).These cylinders are nitrates but the inner is worn,and the most of it is to be replaced by a bimetallic piece.

 

[CoryPad]

Nitrided steel is very hard. The best thing to do is grind, not turn.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[arunmrao]

agree with corypad. remove the nitrided layer by grinding and then attempt to turn.

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[EdDanzer]

Try CBN. Diamond will react with the carbon in the steel.

Ed Danzer

http://www.danzcoinc.com

http://www.dehyds.com

 

[eromlignod]

I don't think you'll get very good results cuting with a simple lathe bit. Even if it's hard enough to cut the case you'll find that the surface will chip and spall like glass and it will be difficult to get a good finish.

What you need is a grinder attachment for your lathe. It attaches to the toolpost and has an electric grinder wheel.

Don
Kansas City