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B. Kianian and C. Andersson
Table 33.1 PPC input parameters (Ståhl et al. 2007)
Description
Symbol
Unit
Running/maintenance hours
h P,M
h/h
Hours per year and shift
h year
h/year
Interest rate
i
%
Annual cost of producing a product
K
SEK
Investment
K 0
SEK
Tool, lubricant and additive costs
k A
SEK/unit
Material cost per part
k B
SEK/unit
Personnel costs
k D
SEK/h
Cost of Maintenance
K M
SEK
Maintenance cost of equipment/hour
k Mh
SEK/h
Eq. running costs (e.g. energy)
k ph
SEK/h
Cost for renovation
k ren
SEK
Additional costs
K SUM
SEK
Annual cost of production area
k y
SEK/m2
Estimated equipment lifetime
n
Year
Nominal batch size
N 0
Unit
Numbers of operators
n op
-
Number of batches connected to a specific tool
n pA
-
Number of renovation during the lifetime of the equipment
N ren
SEK
Quality
Q
%
Performance
P
%
Availability
A
%
Nominal cycle time per part
t 0
Min
Production time for a batch
T b
h
Required production time
T p
h
Total paid and planned production time during a given period
T plan
h
Set-up time
T SU
Min
Machine utilization
U IC
%
Area of production and area needed to facilitate production
Y
M2
evaluated. In the Eqs. (33.2) and (33.3), k cp is the equipment cost during the operation (hourly), and k cs is equipment cost during standby and downtime (hourly) (Ståhl
et al. 2007).