The probable cause for the pressure spike was the final filling of the core tooling due to the stopping of particle flow and "squeezing" of air as sand finally fills that section of core immediately under a blowtube.
Further, air is channeled into the small diameter blowtubes producing high air velocities and a large pressure loss.
Examination of the model's computed pressure distribution throughout the entire machine reveals that a large pressure-drop occurs along the blowtubes after filling.
Increasing the magazine pressure only causes a higher velocity and pressure drop in the blowtubes with a small increase in the core cavity pressure.
The software allows engineers to visualize the sand-filling pattern, determine the location and sizing of blowtubes
and vents, optimize blow parameters, and select the proper arrangement of cores on tooling.