Hard steel machining

[Gus]

Hey Guys..

I'm quoting on a job that requires us to counterbore 2" dia. holes 1-1/2" deep into liner plates with 400 BHN min. I'm used to aluminum and mild steel on our mill, and not really familiar with speeds/feeds for hard steels. Any recommendations for speeds and feeds, so I can run an acurate backplot for the quote. I have 2000 holes to do.Also what tooling recommended.

 

Thanks Gus

[Irongate Machine Inc]

I would suggest the Ingersoll quad drill for the drilling.

[jeff]

Iscar Cham-drills are very good also.

400 brinell is about 43r/c if i'm correct,so it isn't "that" hard.

Hanita Varimills could be useful for finishing the c/bores if needed.

[Hardmill]

Look into one of the high-feed mills, ive only used Sandviks and they rock.

No need to drill either.

 

Thay also have alot of different apps that may apply.

 

 

PEACE

[Gus]

What about speeds and feeds??

[?Mark]

Just recently run some duramax rods with a bore of 2.5" in 4340. Used seco feed mill 1.5" S1528 F183.

Took about 30 seconds to rough this hole.

Hardmill is right again, thats the fastest and easiest way, unless you've got some serious hp to use drills that big

 

 

edit:

if you go with seco-carboloy, for 2.00 bore you'd need 1.0 or 1.25 feedmill.

It's best to get a local rep to bring a tool for a test. Some people can't stomach those feeds