The metal insert overmolding molds for automotive parts must balance the collaborative molding of metal inserts and plastic materials. The core lies in the control of positioning accuracy for metal parts in cavity design, where structures like positioning pins and clamping grooves are employed to prevent insert displacement. Meanwhile, the runner system should adapt to the characteristics of plastic melt—for example, using fan-shaped gates to reduce weld lines—ensuring a tight bond at the metal-plastic interface and avoiding defects such as bubbles and delamination.

These molds commonly adopt hot runner technology to shorten the molding cycle, coupled with a temperature control system for precise mold temperature regulation, enabling uniform cooling and shrinkage of plastic during metal overmolding. Aiming at the weather resistance requirements of automotive parts, the mold surface is typically hardened to enhance wear resistance. The ejection mechanism is designed with a multi-ejector pin structure for uniform force distribution, preventing deformation of overmolded parts due to stress concentration during demolding and ensuring product dimensions comply with assembly standards.