Surface finish from an investment casting
Surface finish from an investment casting
(OP)
Hi All
Hope this is the right place to post it.
Anyone has the surface finish specification from an investment casting? What is the standard on ICI (Investment Casting Institute) handbook?
Thanks for all help
Season
Hope this is the right place to post it.
Anyone has the surface finish specification from an investment casting? What is the standard on ICI (Investment Casting Institute) handbook?
Thanks for all help
Season





RE: Surface finish from an investment casting
A quick Google search shows: Link
Chris, CSWA
SolidWorks 14
SolidWorks Legion
RE: Surface finish from an investment casting
Google search tell me the standard finish from an investment casting can be reached is 125 (3.2) microfinish, but our supplier said they can reach to 250 (6.3) only, so I just want to know what is standard requirement on ICI handbook.
Season
RE: Surface finish from an investment casting
RE: Surface finish from an investment casting
In reality, investment castings can be supplied with almost any level of surface roughness you want. The casting surfaces can be smoothed out using various secondary processes like tumbling or hand polishing if you are willing to pay for it. Many investment castings undergo shot blasting to remove the shell material, so the general surface roughness of the delivered castings would be whatever results from the shot blast process. However, there may be local areas on the casting that are very rough, such as locations where saw cuts and hand grinding were done to remove sprues or flash. You should allow for very rough surface finish in these locations, and also allow for a fair amount of surface mismatch.
RE: Surface finish from an investment casting
125Ra is probably achievable over the bulk of the part, but the slightest imperfection will violate that limit. As a casting vendor I would be wary of any such specification that applies uniformly over the whole part. Consider using SCRATA surface comparators.