Fluorescent Penetrant Testing
The aPriori Starting Point VPEs define a single machine for this process.
Cost is based on the following formula:
Process Time = Penetrant Dwell Time + Excess Penetrant Removal Time +
Developer Dwell Time + Examination Time
Process time is the sum of the following:
• Penetrant dwell time: retrieved from a node attribute of an upstream process. See the Cost Model Workbench Guide for information on node attributes. Dwell time is determined as follows:
o If machining is permitted with the current primary process group, dwell time is the value of the node attribute penetrantDwellTime for the node Machining (10 minutes in aPriori Starting Point VPEs).
o If machining is not permitted with the primary process group, dwell time is the value of the node attribute penetrantDwellTime for the primary process group’s top-level node (for example, with the Transfer Die process group, the node Sheet Metal – Transfer Die).
o If machining is not permitted and the primary process group’s top-level node lacks the attribute penetrantDwellTime, dwell time is the value of the cost model variable defaultPenetrantDwellTime (10 minutes in aPriori Starting Point VPEs).
• Excess penetrant removal time: specified by the machine property Excess Penetrant Removal Time (120 seconds in aPriori Starting Point VPEs).
• Developer dwell time: retrieved from a node attribute of an upstream process. See the Cost Model Workbench Guide for information on node attributes. Dwell time is determined as follows:
o If machining is permitted with the current primary process group, dwell time is the value of the node attribute developerDwellTime for the node Machining (10 minutes in aPriori Starting Point VPEs).
o If machining is not permitted with the primary process group, dwell time is the value of the node attribute developerDwellTime for the primary process group’s top-level node (for example, with the Transfer Die process group, the node Sheet Metal – Transfer Die).
o If machining is not permitted and the primary process group’s top-level node lacks the attribute developerDwellTime, dwell time is the value of the cost model variable defaultDeveloperDwellTime (10 minutes in aPriori Starting Point VPEs).
• Examination time: calculated as the product of the part surface area and the cost model variable visualInspectTimeStandard (5 min/m2 in aPriori Starting Point VPEs).