English to Lithuanian Tech/Engineering Energy / Power Generation

"Investment casting process allows the use of alloys that are difficult to form or machine and provides great design flexibility for inter-nal cooling schemes. For example, ceramic coring is used extensively in these castings to form air-cooling passages and to provide weight reduction."

Ar tai tas pats "coring", kaip čia: http://en.wikipedia.org/wiki/Coring ? Gal žinote, kaip tai vadinama lietuviškai?