How to salvage core portion out of a bar stock for expensive material?
How to salvage core portion out of a bar stock for expensive material?
(OP)
Experts: we buy large diameter nickel based alloys and we really prefer material in tube format, but you know often times we end up with getting bar stocks. What is the best way to get the core portion out and save it for small parts?





RE: How to salvage core portion out of a bar stock for expensive material?
http://www.americanheller.com/trepanning-main.html
http://www.amhollow.com/main/whatwedo.php
RE: How to salvage core portion out of a bar stock for expensive material?
Mike Halloran
Pembroke Pines, FL, USA
RE: How to salvage core portion out of a bar stock for expensive material?
RE: How to salvage core portion out of a bar stock for expensive material?
You mention your preferred stock requirement is a large diameter tube. Depending upon your actual length/diameter/wall thickness requirements, rolled rings may be more cost effective. With a rolled ring there is a cost involved with the rolling process, but there is also no material selvage like there is with trepanning. Ring rolling can be cost effective where the material cost is very high. The ring rolling process is relatively inexpensive, since it is largely automated and requires no tooling.
Terry
RE: How to salvage core portion out of a bar stock for expensive material?
RE: How to salvage core portion out of a bar stock for expensive material?
The material under discussion is high Ni alloy,and often one might find it difficult to source in other forms.
But, I have seen similar methods being adopted for 316 grades,which is a waste.
_____________________________________
"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: How to salvage core portion out of a bar stock for expensive material?
You might also want to look at these process if your part is amenable to them. Wisconsin Centrifugal is very good and has several ways to get to the end product. Dynamic though limited in sizes makes a very good product.
http://ww
http://www
RE: How to salvage core portion out of a bar stock for expensive material?
To unclesyd, thank you for the pointers. Will check them out. Conern I have they may have long lead time. Our qty is very low and time is tight as we are in prototype. Definitely will consider them for production.
RE: How to salvage core portion out of a bar stock for expensive material?
RE: How to salvage core portion out of a bar stock for expensive material?
Some bar operations will give you a core charge for your chips, provided they're segregated by material. That can be better than hauling them off to a scrap dealer who will need to find a market for them.
RE: How to salvage core portion out of a bar stock for expensive material?
I wouldn't use a treapnned core for anything that scrap wasn't a suitable raw material for.
rp
RE: How to salvage core portion out of a bar stock for expensive material?
Huge, huge savings at the end of the day rather than trying to use solid material, and actually ended up with better mechanical props as a result.
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
RE: How to salvage core portion out of a bar stock for expensive material?
To redpicker, we are talking about aging or precipitation hardening steel, so I personally feel dimension is not that critical, right? How about a re-heat treatment to the core?
To ornerynorsk, that is a cool job. I agree flat rolled and welded plates got superior straightness, concentricity, consistent wall thickness. Sadly, a lot of people don't even consider welded tube at all. Our case is corrosion is obstacle.
RE: How to salvage core portion out of a bar stock for expensive material?
RE: How to salvage core portion out of a bar stock for expensive material?
RE: How to salvage core portion out of a bar stock for expensive material?
rp
RE: How to salvage core portion out of a bar stock for expensive material?
Over the years I've never seen any measurable problem with large diameter high alloy bar. In some case we have used wrought bar for high speed impellers that equal forged blanks.
We use a lot of tool steels and PH steels in components where the highest operational stresses would be at the center of the starting bar stock in some cases a 10" diameter bar.
I will also agree that if you have any reservations about the application you may not want to use the core unless you do a through analysis of the material.
RE: How to salvage core portion out of a bar stock for expensive material?
RE: How to salvage core portion out of a bar stock for expensive material?
_____________________________________
"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: How to salvage core portion out of a bar stock for expensive material?