The insert becomes part of the die — plan for it.
Positioning and retention
The insert must locate repeatably in the die, resist shifting during shot, and provide mechanical interlock so the casting cannot spin or pull free in service. Knurling, holes and flanges are the usual anchors.
Remember the insert heats and expands with the casting; differential expansion between materials drives residual stress.
Process and service questions
Consider the insert's thermal path, whether platings or oils on it will gas the melt, and how the finished part will be inspected — interfaces hide defects that only sectioning or NDT will find.
Agree the interface acceptance criteria with your caster before tooling starts.
FAQ
Can any metal be used as an insert?
The insert must survive the casting temperature and not react problematically with the alloy; surface treatments need review.
How are inserts positioned in the die?
Usually by dedicated locating pins in the die, loaded by hand or automation each cycle.
How do we verify the bond?
Mechanical testing, sectioning during development, and defined NDT for production-critical interfaces.
All figures above refer to standard product data sheets; final confirmation is subject to written quotation.