Casting Sand inclusion/Porosity
Casting Sand inclusion/Porosity
(OP)
Hi All,
We faced a problem with a Chinese foundry on a precision casting: They poured the same part from CD4MCuN with no problem before but now they have this sand inclusion problem with A216 WCB (as shown attached)! I am wondering if any body has experienced this kind of defect and know the root cause? This is the critical path for a big project so any recommendations would be much appreciated!
Thanks.
http://files.engineering.com/getfile.aspx?folder=1...
We faced a problem with a Chinese foundry on a precision casting: They poured the same part from CD4MCuN with no problem before but now they have this sand inclusion problem with A216 WCB (as shown attached)! I am wondering if any body has experienced this kind of defect and know the root cause? This is the critical path for a big project so any recommendations would be much appreciated!
Thanks.
http://files.engineering.com/getfile.aspx?folder=1...





RE: Casting Sand inclusion/Porosity
How large is the casting, how large is this protrusion into the part, how large is the section thickness around the hole, is the hole in the cope, drag or made by a core, how is the mold made, if made by a core how is it made, and what kind of sand is used?
RE: Casting Sand inclusion/Porosity
It appears to be case of broken core, leading to metal penetration in the hole.
Was the defective casting shipped to you without your consent?
Since you continue to patronize China foundry, it will help if you keep a copy of " International Atlas of Casting Defects" by AFS.
"Even,if you are a minority of one, truth is the truth."
Mahatma Gandhi.
RE: Casting Sand inclusion/Porosity
The sand intrusion is not only around the centre bore. See the attached picture for the moulding. They used what they called it urea! I'll try to get more info for the sand.
http://files.engineering.com/getfile.aspx?folder=e...
RE: Casting Sand inclusion/Porosity
"Even,if you are a minority of one, truth is the truth."
Mahatma Gandhi.