Shrink analysis enables you to determine an appropriate shrinkage allowance to use to cut the mold taking into account the shrinkage characteristics of the material being used to mold the part and the molding conditions.
Every part which is injection molded requires someone to select the dimensions to which the mold must be cut. In the past, many precision parts have required molds to be heavily modified so that tolerances can be met successfully. On some occasions, molds have been scrapped several times over, in order to achieve the required dimensions, incurring huge costs and significant delays in time to market for the product.
Material shrinkage is defined as the reduction in the size of a molded component in any direction after it has been ejected from the mold. It is related to the flow and cooling conditions under which the component is injection molded. Shrinkage data characterizes this reduction in component size due to shrinkage for a range of different processing conditions. Shrink analysis is available for any material in the Materials Database that has been shrinkage characterized.
Although it is possible to run a Shrink analysis with a fiber-filled material without selecting the Fiber-orientation analysis option, the result will not take orientation into account and will not be as accurate. If you are analyzing a fiber-filled material you should turn on the fiber analysis option in the Fill+Pack process settings.
You can determine an appropriate shrinkage allowance by running a Shrink analysis.
This dialog is used to modify shrink related settings.
Shrink analysis calculates a recommended shrinkage allowance to be used when designing the mold taking into account the shrinking characteristics of the current material as obtained from shrinkage testing.
There are several shrinkage models used in this product, depending upon how much information about the material is available.