the melt cycle.) In Fig. 1a, the melt time of one system is 40 minutes and the time required for the off-time functions is 22 minutes. Te overall melt cycle time is 62 minutes, mean- ing the power supply utilization is 65% (40 divided by 62). In Fig. 1b, the melt time of the second system is 60 minutes and the off time is only 14 minutes, meaning the overall melt cycle time is 74 minutes. Tis example has a power sup- ply utilization of 81%. Being more efficient with off-time functions can increase utilization.


Five Hypothetical Cases


Five hypothetical melt systems, all with varying power demands and capabilities, are shown in Fig.s 2a-2e to illus- trate how the highest rate of production versus demand can be achieved by maximizing efficiency, melt system performance and utilization.


Te first three examples are heel melting operations with


differing configurations and capabilities. System 1 is a one- on-one mains frequency system pouring 6.5 tons per hour


Figs. 2a-2c. The first three hypothetical systems are differently configured heel melting operations.


48 | MODERN CASTING February 2015


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