The number of inserts on die-cast parts should not be excessive; secondly, the connection between the inserts and the die-cast part must be firm, and grooves, protrusions, knurling, etc., are required on the inserts; thirdly, inserts must avoid sharp corners to facilitate placement and prevent stress concentration in the casting. If there is severe electrochemical corrosion between the casting and the insert, the surface of the insert needs to be plated for protection; finally, castings with inserts should avoid heat treatment to prevent volume changes caused by phase transformation of the two metals, which could loosen the inserts.
All parts of the die-cast part should have rounded corners (except at the parting line) to ensure smooth flow of metal during filling, facilitate gas escape, and prevent cracks caused by sharp corners. For die-cast parts that require electroplating and coating, rounded corners can be evenly plated to prevent paint buildup at sharp corners. The radius R of the rounded corners of die-cast parts should generally not be less than 1 mm, and the minimum radius is 0.5 mm.
