CNC Information | Learn CNC | CNC Programming G-Code

Hello guys
We are trying Hard part turning on PUMA 400 lathe(hardness upto 62 HRC).
Has anybody done it?
Let me know more info. about it if anybody having it.
Thnx.

Our shop runs a lot of K-500 Monel (heat treated) which can be as hard as what you are asking about.

Good inserts preferrably ceramic coated carbide.

The hardness you are talking about is going to wear out the best inserts quickly. 0.015 per pass roughing and .003 - .005 for a finish pass.

Watch for sparks. Flip the insert and start again. Up the feed a bit to prevent premature wear. You'll have to learn as you go, and may break an insert regardless of what you do.

I have to offset a few tenths from part to part to maintain tolerances.

It's tricky stuff and has to be watched carefully with your hand on the E-Stop.

Good Luck.

Turning the workpiece at 62 HRC is challenging. It requires different technology.

First and foremost, machine should be specially designed for hard part turning. Secondly, insert selection : You can use cermet or CBN or PCD insert, cermet being the cheapest among the three. Thirdly, Cutting parameter : You will have to use a cutting speed as low as 150 m/min and a feed rate of 0.12 mmpr. Use lot of flood of coolent.

let me know the result !?

regards,

Jasmin shah

Thank you for your valuable info.
I am happy to tell you that we have succesfully turned components of 62 HRC hardness within 0.006-0.008 mm accuracy and repeatability.
But there is a small problem we are facing.
Microstructure looks slightly reddish.
Any suggestions?
Whether it will affect when component is used in pnumatic machinary?