C276 Holes
C276 Holes
(OP)
All:
We need to place 1 1/8" diameter holes in some 1" thick C276. What is the best process for this without impacting the integrity of the material? The last vendor we used had no problem with our AL6XN but a world of trouble with the C276 which makes no sense. We found out what too much heat input will do and cannot afford that mistake.
We need to place 1 1/8" diameter holes in some 1" thick C276. What is the best process for this without impacting the integrity of the material? The last vendor we used had no problem with our AL6XN but a world of trouble with the C276 which makes no sense. We found out what too much heat input will do and cannot afford that mistake.





RE: C276 Holes
ht
RE: C276 Holes
RE: C276 Holes
Sounds thick to water jet to me, but I have been out of the work for a while.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: C276 Holes
Aaron Tanzer
www.lehightesting.com
RE: C276 Holes
RE: C276 Holes
C-276 is very wear resistant and quickly work hardens so use only a very rigided setup and the proper tooling is required. In drilling the operation should be continuous with no stops and starts. Power feeding is recommended. Drill bits have to be sharpened regularly.
I would contact bit manufacturer, like Gurhing, to get there recommendation
RE: C276 Holes
RE: C276 Holes
assuming Rb, are at the upper end of the scale and in reality
are not that different. Over the years we learned that the
hardness range of C-276 was not a very usable physical
property. We actually depended on the MTRs for the thermal
history and other physical properties even though these were quite variable in even in the same heat.
As posted above the material is extremely hard, but not
impossible, to machine. I've been trying to find more specifics our machining process.
RE: C276 Holes
We did a sample production weld for hole testing as well. I didn't let the material reach much over 300 deg. one inch from the weld. I talked to the welding super to see how they monitored heat input and the answer was, "we didn't". Knowing that now, I suspect our issues can be solved.