Simple Solutions That Work! Issue 10

23 Contact: SVETLANA DODIK-PELJA [email protected] HOW TO between feeder and casting, precisely where poorly compacted sand may occur with other designs. Tele-feeder designs using exothermic materials in both upper and lower sections guarantees that such feeder designs provide up to 50% efficiency rate of their volume to the casting. And the introduction of very low-to-no fluorine exothermic materials used in c-b feeders provides on-going benefit for the recirculating green sand system. The valuable benefits in practice has been the formation of a defined break-off point as a part of contact area that enhances separation of the feeder from the casting and significantly reduces cleaning costs compared to other designs. The most powerful value of the tele-feeder is the exothermic neck which allows: • The connection between the casting and upper part of the feeder stays hot for a longer time, without increasing feeder size. • The neck geometry provides directional solidification and avoids undesirable matrix degeneration around the contact area. • The significantly reduced contact area of the tele-feeder allows for many options in positioning the feeder on the casting to provide very accurate feeding of critical spots on the casting prone to shrinkage. Further benefits include: • The centering pins have a very simple maintenance-free design and are relatively inexpensive to manufacture. • The centering pins provide an air vent during the molding process. All these benefits enhanced reasons to use the tele-feeder technology to make shrink-free castings with significant savings in molten metal and reduced or eliminated time in the cleaning operation.