Abstract:

A new multi plate the first mock examination with two cavities and a submarine gate and two⁃plate was innovatively designed for the injection molding of synchronous sealing shell plastic parts. In this mold， a zone and step demolding mode was adopted to achieve automated injection molding production of the plastic part. Such a specific method decomposed the entire circular groove on the inner wall into four sections， in which two sections were involved in the inward sliding blocks for core demolding， and other two sections were kept to use two "tile"⁃shaped lifters for side⁃core demolding. The semi⁃circular groove on the outer wall used two fixed mold side half slider blocks for side⁃core demolding， and the plastic part was ultimately pushed out of the mold by an ejector plate. The complete demolding of plastic parts was achieved through five actions of the mold， including three opening actions and two ejection actions， in which the third opening and two ejection actions were synchronous. The first mold opening allowed the inward sliding block to partially demold the inner wall circular groove， followed by the action of the half slider block of the outer wall to complete the side⁃core demolding. The second mold opening allowed the plastic part to detach from the cavity insert. The third mold opening included the second ejection action of the secondary ejection mechanism. The first ejection was achieved by using the first ejection plate of the second ejection mechanism to push the lifters out of the remaining circular groove on the inner wall. The second ejection plate pushed the plastic part out of the core molded part to complete demolding.

Key words: synchronous sealing shell, outer wall circular groove, inner wall circular groove, half slider, internal slider, diagonal roof, secondary ejection