Today's KNOWLEDGE Share : Core defects leads to catastrophic results
Today's KNOWLEDGE Share Based on consulting requests, I realize that a lot of people forget that huge forces are developed during the molding process, as a result of pressure levels exceeding often 1000 bar/100MPa. That amounts to 1 metric Ton of equivalent force applied to each square cm of tool surface.That is why clamp tonnage numbers are what they are of course. But, no matter how good your steel or tool design is, metal will bend significantly when subjected to huge unbalanced forces. And, even more surprisingly, for balanced forces, the cavity will expand by "compressing" the steel by quite a few microns ! You can run a quick FEA to check that, by applying 1000-2000 bar on a piece of steel. Of course tubular shaped parts will readily see significant core shift problems as soon as flow is slightly unbalanced, since a differential of a few Tons-force can quickly appear if flow is not perfectly balanced. The problem here is, of course, that the more the core deflects, ...