Forming
The calculations described in this section cover the cost models for the following processes:
• Expansion
• Flanging
• Flaring
• Flattening
• Knurling
• Notching
• Reduction
• Slotting
aPriori uses the formulas below to determine costs associated with these forming processes.
Accounting Calculations
Labor Time = Cycle Time * Machine Labor Time Standard * Machine Labor Ratio
Labor time is the product of the following
• Machine labor time standard (specified as a machine property). This value reflects the amount of time spent by machine operators in between machine cycles, including time performing maintenance and cleaning tasks as well as time pausing between tasks. The amount is expressed as a cycle time multiplier.
• Machine labor ratio (specified as a machine property)
Labor Cost = ((Labor Time / 3600) * Machine Labor Rate) / Process Yield
Labor cost is a function of the following:
• Labor time (see formula above)
• Machine labor rate (specified as a machine property)
• Process yield (see formula below)
Amortized Batch Setup =
(Machine Setup Time * (Machine Labor Rate + Direct Overhead Rate)) / Batch Size
Amortized batch setup is a function of the following:
• Machine setup time (specified as a machine property)
• Machine labor rate (specified as a machine property)
• Direct overhead rate (see
Direct and Indirect Overhead)
Process Yield = 1 / (Machine Process Yield/100)
Process yield depends on the machine property Process Yield.
Cycle Time Calculation
Cycle Time = Machine Load Time + Machine Unload Time + Form Cycle Time
Cycle time is the sum of the following machine properties:
• Machine Load Time
• Machine Unload Time
• Form cycle time depends on the following
o Number of formed features
o Machine property End Form Cycle Time