Boring 316L insert recommendations

[GoetzInd]

Boring a lot of 316ss with 3/8 indexable CCMT 1/4 IC

insert. Right now we've been using Widia's SS grade and the tool life has been pretty sad. Iv'e gone from 300 to 800 sfm and .004 to .008 ipr staying with .015 DOC. Bar stickout is about 4d. I'm wondering what you guys have been using on this stuff. We used to cut this stuff pretty often and I don't remember it being this bad. Maybe we've got a little soft with all the 7075 and 303 comin through. Any help would be greatly appreciated.

 

Thanks,

MIke

[chris m]

So you almost tripled your SFM and doubled your feedrate? I confused

 

The smaller the TNR the better with stainless for the most part. We don't do much austenitic SS but typically we run cermet for finishing, which is what I'm assuming you're talking about.

[jeff]

Sandvik has some really good inserts for SS.

2025 grade if I remember correctly.

[GoetzInd]

Chris,

What I'm saying is that we've tried feeds and speeds in this range, without much difference. Which

makes me think it's time to look at a different insert.

[chris m]

OK, now I get you. If you're going to use carbide from Sandvik, 2015 is a pretty good grade; 5015 is a good cermet grade from them. 400-450SFM would be the max for reliability on that material, I would think

[GoetzInd]

quote:

---

400-450SFM would be the max for reliability on that material, I would think

---

That's where we saw the best tool life. The widia rep insisted on 800sfm and we preceded to watch it make about 10 parts before throwing in the towel.

 

Mike

[GoetzInd]

BTW we're seeing alot of chip welding.

 

Mike

[Goldorak]

Sumitomo makes the best inserts for ss316L

(gr AC630M)

 

 

and i tested them ALL...

 

350 SFM .06 DOC .01 IPR

this will cut forever

[Gary]

iscar has a good stainless grade 908 or 907 I believe. 350sfm and light .005 feed works pretty good. I think you could bump the doc cut up some to make up some time. .03-.035 doc.

[Goldorak]

i used the AC630M up to 500 SFM .250DOC and .018 IPR with pretty good tool life on our Okuma Crown

 

the Iscar's IC908 is a good choice too

[Larry1958]

.015 DOC is way to light. The more passes you are taking with the insert = less parts. Try taking a deeper cut. I usually go with 3 times my nose rad. (min.) if setup is rigid enough.