Coremaking--Stock Core

Since stock cores are made by a relatively inexpensive extruder that extrudes a sand mixture through an extruding head, the cost model considers labor and overhead to be negligible for this process. All Stock Core costs are in expendable tooling.

Expendable Tooling Cost = Aggregated Operation Expendable Tooling / Final Yield

• Sand cost: aggregated from child operations—see formula below.

• Final yield (see Yields for Sand Casting)

Operation Expendable Tooling = (Stick Expendable Tooling + Stick Labor Cost + Stick Direct Overhead Cost) / Cores Per Stick

Expendable tooling cost depends on the following:

• Stick Expendable Tooling: based on stick volume together with new sand cost per unit mass, sand disposal cost per unit mass, and sand density, listed in the sand lookup table by sand type (specified by a machine property), as well as sand additive rate and percent (if applicable--see the PSO Sand Additive Type in Melting Setup Options) listed in the lookup table tblSandAdditive.

• Stick labor cost (see formula below)

• Stick direct overhead cost (see formula below)

• Cores per stick (depends on stock core length and core length)

Stick Labor Cost = Stick Cycle Time * Machine Labor Rate * Machine Operators

Stick labor cost depends on the following:

• Stick cycle time (depends on stock core sticks per hour specified in the Stock Cores lookup table)

• Machine labor rate (specified as a machine property)

• Machine operators (specified as a machine property)

Stick Direct Overhead Cost = Stick Cycle Time * Machine Overhead Rate * Machine Operators

Stick direct overhead cost depends on the following:

• Stick cycle time (depends on stock core sticks per hour specified in the Stock Cores lookup table)

• Machine overhead rate (specified as a machine property)

• Machine operators (specified as a machine property)