The core of the molding coil manufacturing process involves injecting epoxy resin, polyurethane, or other thermosetting plastics into a metal mold containing a pre-wound coil under heat and pressure, allowing it to solidify. Key steps include preparing the winding, placing it in the mold, injecting the material, heating and pressurizing for curing, and demolding.
The specialized mold used in the manufacturing process typically includes a lower fixed mold and an upper sprue mold that close to form the coil's injection cavity, as well as a first insert for the coil's shaft hole to pass through. The first insert has opposing upper and lower ends; the upper end forms a sprue communicating with the upper sprue mold, and the lower end forms a locating post. The lower fixed mold has a locating hole to receive the locating post and also includes a locating pin that vertically limits the first insert. The locating pin vertically limits the first insert, securing the injection-molded coil and insert to the lower fixed mold during demolding, simplifying the process and helping to maintain the stability of the mold and coil during demolding.
