Primary Direct Costs for Plastic Molding

IM and RIM Primary Direct Costs

Material cost and direct overhead cost are calculated using the formulas below.

Material Cost = (Part Volume * Material Cost Per Volume) / Utilization

aPriori calculates the cost for material based on the following factors:

• Part volume (obtained by GCD Extraction)

• Material cost per volume (see formula below)

• Material utilization rate (see Material Utilization for Plastic Molding)

Material Cost Per Volume = Material Cost Per Mass * Material Density

Material cost per volume is the product of the following quantities:

• Material cost per mass (specified in the Material Selection dialog)

• Material density (listed in the Material Selection dialog)

Labor Cost = Labor Rate * Labor Time

Labor cost is the product of the following:

• Labor rate

• Labor time (see Times for Plastic Molding below)

SFM Primary Direct Costs

Material cost and direct overhead cost are calculated using the formulas below.

Material Cost = (Part Volume x Material Cost Per Volume x Percent Filled) / Utilization –

Foam Cost Per Part

With SFM, injection partially fills a part’s mold with material. Only after the foam expands is the mold’s entire volume occupied. So aPriori calculates the cost for material based on the following factors:

• Part volume (obtained by GCD Extraction)

• Material cost per volume (see formula below)

• Percent filled (default of 0.75 specified in plant variables or user-specified value—see User Inputs for Plastic Molding)