Sand Core Filling Video

October 09, 2012

For Immediate Release

New YouTube video shows the filling/shooting of an automotive cylinderhead waterjacket core.

Arena-flow YouTube Video

To watch the video click here.

The video is an example of how simulation technology may be used during process development to determine how factors such as core geometry, blow tubes (number, locations, geometry), venting, and other factors affect core-making.

In this example, a complex  head waterjacket is filled through an integrated core print.  The sand flow is influenced by both gravity and air flow.  The air flow is determined by the blow pressure and the air escape pathways through discrete vents.  As the core fills and vents become covered, the air flow changes as well, further affecting the filling.

Several things can be learned from the video.  While the core print region on the right is last to fill, this is not necessarily a problem.  A large volume of core is located here, and the sand fills the print with a high energy (high velocity).  More or larger blow tubes may help filling, if desired.

Some poor filling is also noted in the critical, thin, pattern-forming passages inside the waterjacket itself.   Here the region is filled by slow-moving sand.  For a cold-box core, any variation in condition from blow to blow (vents clogging, binder aging, poor tool seal, inadequate blow pressure, etc.) can exaggerate the variation and lead to potential problems here.

While this example only shows one case typical of early prototype development, the Arena-flow Sand Core Engineering technology can be used to perform trial-and-error in a virtual simulation environment, before cutting and modifying costly tooling.