This section lists some important Injection Molding, Reaction Injection Molding, and Structural Foam Molding cost model variables, together with default values and descriptions. For Compression Molding, see Compression Molding Cost Model Variables.
Variable | Value | Unit Type | Units | Description |
|---|---|---|---|---|
defaultNumTryOuts | 3 |
|
| Default number of tryouts. (Tooling Cost Driver) |
defaultPercentGas | 0 |
|
| Default usage percentage by part weight for physical gas. Only applicable for Structural Foam Molding. User may override via Process Setup Options. |
defaultRegrindAllowance | 0.25 |
|
| Default allowable percentage of runners and scrap allowed with virgin material. (Material cost driver) |
clampForceSafetyFactor | 1.1 |
|
| Multiplier of clamp pressure required to ensure that the machine is capable of applying the necessary mold pressure. |
densityPolystyreneForShotSize | 1040 | Density | kilogram / millimeter^3 | Industry standard density of polystyrene used to define shot size in grams. |
largeInsertArea | 36 | Area | inch ^ 2 | Standard 6" x 6" area of a large insert. Used to calculate the insert volume of a large rib. |
largeLifterVolume | 1500 | Volume | inch ^ 3 | Standard volume of a large lifter. Used to calculate the total volume of a large lifter bundle. |
largeSlideVolume | 2000 | Volume | inch ^ 3 | Standard volume of a large slide. Used to calculate the total volume of a large slide bundle. |
mediumInsertArea | 9 | Area | inch ^ 2 | Standard 3" x 3" area of a medium insert. Used to calculate the insert volume of a medium rib. |
mediumLifterBundleWidthThreshold | 127 | Length | millimeter | Width threshold between a medium and large lifter bundle (based on 5 inches). |
mediumLifterVolume | 500 | Volume | inch ^ 3 | Standard volume of a medium lifter. Used to calculate the total volume of a medium lifter bundle. |
mediumSlideBundleWidthThreshold | 304.8 | Length | millimeter | Width threshold between a medium and large slide bundle (based on 12 inches). |
mediumSlideVolume | 1100 | Volume | inch ^ 3 | Standard volume of a medium slide. Used to calculate the total volume of a medium slide bundle. |
percentFilled | 75 |
|
| Percentage of the mold that is initially filled before foam expansion occurs. Only applicable for Structural Foam Molding. User may override via Process Setup Options. |
scrapTimeInMinutes_IM | 15 | Time | minute | Initial setup time for Injection Molding where parts are assumed to be scrap. Determine the setup cost per part. |
scrapTimeInMinutes_RIM | 30 | Time | minute | Initial setup time for Reaction Injection Molding where parts are assumed to be scrap. Determine the setup cost per part. |
scrapTimeInMinutes_SFM | 30 | Time | minute | Initial setup time for Structural Foam Molding where parts are assumed to be scrap. Determine the setup cost per part. |
shotSizeSafetyFactor | 1.02 |
|
| Multiplier of required shot size to account for material left in chamber. Used to calculate the required shot size. |
smallInsertArea | 1 | Area | inch ^ 2 | Standard 1" x 1" area of a small insert. Used to calculate the insert volume of a small rib. |
smallLifterBundleWidthThreshold | 76.2 | Length | millimeter | Width threshold between a small and medium lifter bundle (based on 3 inches). |
smallLifterVolume | 75 | Volume | inch ^ 3 | Standard volume of a small lifter. Used to calculate the total volume of a small lifter bundle. |
smallSlideBundleWidthThreshold | 76.2 | Length | millimeter | Width threshold between a small and medium slide bundle (based on 3 inches). |
smallSlideVolume | 75 | Volume | inch ^ 3 | Standard volume of a small slide. Used to calculate the total volume of a small slide bundle. |
timePerTryoutBase | 12 | Time | hour | Basic time per tryout for clamp force under 500 tons. (Tooling cost driver) |