Problem is to know the die area below IHS, I put 12x12mm at one moment, but now dies are larger and often change with generations. Make a die every year is a pain... I don't know really if differences between 12x12 and 16x12 for example will be great, not sure, because IHS acts as a good smoother... Need tests and data, or numerical studies to get a first approach, I'll make tests with Fluent one day, not difficult to model at all...
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