TOOLING MATERIALSApplication / Foundry
A core box forms the expendable sand core that creates an internal cavity in a metal casting. The reusable core box needs accurate joints, repeatable location, adequate venting and reliable core release. Its duty differs from an external foundry pattern.
Engineering requirements
01 / PROCESS
Specify the sand and binder, filling or shooting method, curing process and actual tool temperature. A resin board or cast resin suitable for one process is not automatically suitable for a heated core box.
02 / TOOL DESIGN
Plan parting, vents, filling points, ejection, locating bushes and replaceable wear areas. Joints must remain aligned and sealed during repeated filling and demoulding.
Engineering requirements
| Route | EPTEK family | Project check |
|---|---|---|
| CNC-machined core box | PUBOARD 1350 for Coldbox core boxes | Sand abrasion, detail strength, joints, inserts and operating temperature |
| Cast or replicated core box | project-specific casting systems, subject to core-making trials | Release behaviour, fillers, cure, dimensional change and wall thickness |
| Surface layer or repair | Compatible tooling gelcoats and repair systems | Adhesion, edge detail, abrasion and repair machining |
Engineering requirements
Trial the actual sand and binder system. Inspect core dimensions, parting-line mismatch, surface damage and release consistency. Follow with a casting trial to confirm core location and the resulting internal geometry.