Metal and plastic layered joint part structure and mold and method thereof

The invention relates to a metal and plastic layered joint part structure and a mold and method thereof, and relates to the technical field of injection molding equipment, the structure comprises a metal core part and a plastic wrapping layer wrapping the metal core part; the metal core piece comprises a first insert, a second insert and a third insert, the second insert and the third insert are assembled at the two ends of the first insert respectively, and steps are arranged at the positions where the first insert is matched with the second insert and the third insert; a matching hole and a key groove are formed in the center of the first insert, and the first insert and the positioning shaft are assembled in a hole-shaft clearance fit mode and connected in a key positioning mode. According to the method, the batch manufacturing requirement of the parts is met, and the manufacturing cost of the parts is reduced. The part structure is optimized, injection molding is adopted, the part requirement is met throu