3.2 The Concept of Energy
55
Figure 3.11 Representation of exact consumption profiles and consumption profiles of a
machine determined by mean value formation [RRS2018, p. 76]
producing state, the additional electrical power requirements P are proportional
to the quantity of input material being processed [Be2017, p. 135; GDT2006,
p. 624]:
P = P I DL E + k ∗ ˙
v
(3.16)
with P I DL E power required in the “idle” state in kW
k
machine specific constant in kJ/cm 3
˙
v
rate of material processing in cm 3 /sec
While P I DL E comes from the equipment required to support the production
process, k comes from the process physics 9 .
9 „For example, for a cutting tool, P 0 comes from the coolant pump, hydraulic pump, computer
console and other idling equipment, while k is the specific cutting energy which is closely
related to the work piece hardness and the specifics of the cutting mechanics. For a thermal
process, P o comes from the power required to maintain the furnace at the proper temperature,
while k is related to the incremental heat required to raise the temperature of a unit of product“
[GDT2006, p. 624].