In the same way an approach was proposed for the large sized
castings, where the temperature of the holding and melting
furnace is continuously varying to the moulding line. For this a
Cumulative SUM chart was introduced (CUSUM) (Fig 7). The
statistics used in this chart was the cumulative sum of the
absolute deviations of the temperature from the reference value,
k. This reference value is the target temperature for the
respective weight class [6]. The cumulative sum value should
be reset once the change in weight requires.