Bowed castings straightening
Bowed castings straightening
(OP)
We use castings that are made of astm a297 grade hh - type 2.
These are about 30" L by 3" wide and 1" tall. There is a drive lug on at the centre of the part.
For our application it is very important that these pieces are straight. We just had to send a shipment back for straightening b/c they were off by about 1/4" at the centre.
We have had this problem before, some suppliers heat and straighten while others cold press them. Is one way better than the other? Anything I should keep an eye out for?
Thanks
These are about 30" L by 3" wide and 1" tall. There is a drive lug on at the centre of the part.
For our application it is very important that these pieces are straight. We just had to send a shipment back for straightening b/c they were off by about 1/4" at the centre.
We have had this problem before, some suppliers heat and straighten while others cold press them. Is one way better than the other? Anything I should keep an eye out for?
Thanks





RE: Bowed castings straightening
I have been in the same situation for misc boiler parts exposed to elevated temperature service. I see no problems with using either method other than when the part is placed into elevated temperature service it may warp again especially from cold pressing.
However, in the case I mentioned above, straightness is needed for alignment for fit-up, which is achieved using cold pressing or local heat.
RE: Bowed castings straightening
Cold pressing involves the risk of cracking,especially if the carbon is at the higher end. It also runs the risk of causing harm to the operator.
Save water Drink Beer
RE: Bowed castings straightening
Either method will work and neither is risk free.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Bowed castings straightening
Thanks.
RE: Bowed castings straightening
RE: Bowed castings straightening
Color appearance is only an observation related to surface oxidation, nothing more at this point. I would perform a detailed visual inspection of the castings just to be sure. More importantly, I would certainly contact the supplier and inquire as to what exactly was done to the castings to meet your straightness requirements.
RE: Bowed castings straightening
In your case such minor discoloration should not be a cause of worry. Only it might call for an additional explanation to be given to the inspector.
You may sand blast the part now which will make it look uniformly good with no traces of rework.
Save water Drink Beer
RE: Bowed castings straightening