Material Cost and Utilization for Stretch Forming

Material Cost = Raw Material Cost – Scrap Material Credit – Scrap Part Credit

Material Cost depends on the following:

• Raw material cost: see formula

• Scrap material credit: this is 0 if the setup option Enable Scrap Material Credit is un-checked (the default in starting point VPEs). Otherwise, it is specified by the formula below.

• Scrap part credit: this is 0 if the setup option Enable Scrap Part Credit is un-checked (the default in starting point VPEs). Otherwise, it is specified by the formula below.

Raw Material Cost = (Material Cost Per Mass * Rough Mass) / Final Yield

Raw material cost is the cost of material for one part, including the cost of scrap produced during manufacture of the part, as well as the amortized cost of scrapped parts. It depends on the following:

• Material cost per mass: specified by the material property Cost per KG.

• Rough mass: see formula.

• Final yield: see Yields for Stretch Forming.

Rough Mass = Finish Mass / Utilization

Rough mass depends on the following:

• Finish mass: product of part Volume and material Density.

• Utilization: calculated by the cost engine. This is part mass divided by stock mass. See Material Stock Selection for Stretch Forming.

Scrap Material Credit = Material Cost Per Mass * Scrap Cost Percent * Scrap Mass

Scrap material credit is the product of the following:

• Material cost per mass: specified by the material property Cost per KG.

• Scrap cost percent: this is 0 if the setup option Enable Scrap Material Credit is un-checked (the default in starting point VPEs). Otherwise, it is specified as a percentage by the material property Scrap Cost Percent.

• Scrap mass: see formula.

Scrap Mass = Rough Mass – Finish Mass

Scrap mass depends on the following:

• Rough mass: see formula.

• Finish mass: product of part Volume and material Density.

Scrap Part Credit =

(Material Cost per Kg * Scrap Cost Fraction) *

((Number of Scrap Parts + Number of Scrap Parts Down Stream) *

Rough Mass) /

Total Production Volume

Scrap part credit is 0 if the setup option Enable Scrap Part Credit is set to false. Otherwise, it is the product of the following:

• Material cost per mass: specified by the material property Cost per KG.

• Scrap cost fraction: this is 0 if the setup option Enable Scrap Part Credit is un-checked (the default in starting point VPEs). Otherwise, it is specified as a percentage by the material property Scrap Cost Percent.

• Number of scrap parts: number of parts discarded as scrap by this process. See Yields for Stretch Forming.

• Number of scrap parts down stream: number of parts discarded as scrap by downstream processes. See Yields for Stretch Forming.

• Rough mass: see formula.

• Total production volume: specified in the Production Scenario tab of the Cost Guide.