Updating Lab Testing for Nobake Molds
The development of a new thermal distortion tester for nobake processes could provide additional information on variations in the mold. ANDREW J. OMAN, SAM N. RAMRATTAN, AND MITCHELL J. KEIL, WESTERN MICHIGAN UNIVERSITY, KALAMAZOO, MICHIGAN
has many advantages but it is far from perfect. Problems with the sand cast- ing process arise from variation, which can stem from grain size, grain shape, chemical composition, additives and metallostatic pressure. Understanding these variations is key to achieving
T 32 | MODERN CASTING July 2013
he most popular medium for the production of cast metal parts is sand. Sand
good process control. Tis article is the first in a three-part series on advance- ments in mold testing. In chemically bonded sand systems, the binder system is a significant source of variation. Te level of binder in the sand and the mix of the binder constituents can have significant effects on the final castings. Addi- tionally, new binders are constantly
being developed in response to various environmental and product quality concerns, thus creating new potential sources of variation. As sand composites come into
contact with elevated temperatures in chemically bonded sand processes, a unique thermal gradient will develop to that particular composite. When sand composite comes into contact
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