Coremaking for Die Casting
The cost model for this process relies on the formulas below.
Expendable Tooling Cost = Sand Cost / Final Yield
Expendable tooling cost is a function of the following:
• Sand Cost (aggregated from child operations; based on core volume together with new sand cost per unit mass, sand disposal cost per unit mass, and sand density, listed in the sand lookup table)
Cycle Time = Process Time * Cycle Time Adjustment Factor
Cycle time is the product of the following:
• Process time (sum of the cored feature cycle times--see formula below)
• Cycle time adjustment factor: specified by the cost model variable cycleTimeAdjustmentFactor; 1 in aPriori starting point VPEs.
Cycle Time Per Cored Feature = Machine Base Cycle Time / Number of Corebox Cavities
Cycle time per cored feature is a function of the following:
• Machine base cycle time (specified as a machine property)
• Number of corebox cavities (see below)
• Machine process yield (specified as a machine property)
If the process setup option Corebox Cavity Calculation Mode set to Opportunistic (the default setting in starting point VPEs), the number of corebox cavities is the maximum number of cavities that will fit along the length direction of the coremaking machine. This depends on the following:
• Core feature dimensions (obtained from GCD extraction)
• Machine variables that specify maximum corebox dimensions
• Plant variables coreboxLengthAllowance and lengthCorePrint
If the setup option is set to Single Cavity, the number of corebox cavities is 1. The default setup option setting is specified by the cost model variable coreboxCalcMode (Opportunistic in starting point VPEs).