Molding die

摘要

Provided is a molding die including a die body for molding a molded article, which has an undercut, and a demolding core movable to approach and separate from the die body. When the demolding core is separated from the die body, the demolding core elastically deforms the molded article such that the undercut separates from the die body and makes it possible to remove the molded article from the die body. The die body includes a recess where the depth gradually reduces along the direction in which the demolding core separates from the die body. During molding of the molded article, a projection is formed on the undercut in accordance with the shape of the recess. During removal of the molded article, the engagement between the projection and the recess regulates the movement of the molded article in a direction intersecting the movement direction of the demolding core.

主权项

1. A molding die comprising:
a die body to form a molded article with an undercut, wherein the die body comprises a fixed die and a movable die that acts cooperatively with the fixed die to form the molded article, wherein the molded article is demolded from the movable die in a parting direction along as first axis; and a demolding core arranged to move toward and away from the die body, wherein while moving away from the die body, the demolding core elastically deforms the molded article such that the undercut moves away from the die body, thereby making the molded article detachable from the die body, the die body includes a molding surface for forming the undercut, the molding die includes a recessed portion formed in the molding surface of the die body while being reduced in depth gradually and extending in a direction in which the demolding core moves away from the die body, a projecting portion is formed on the undercut in conformity with the shape of the recessed portion during formation of the molded article, during detachment of the molded article, engagement between the projecting portion of the undercut and the recessed portion of the die body restricts movement of the molded article in a direction crossing the movement direction of the demolding core, the direction of movement of the demolding core is perpendicular to, and away from the first axis, the recessed portion of the movable die has a groove shape and extends in the movement direction of the demolding core, and the projecting portion has a ridge shape, and the projection portion of the undercut is formed on a surface of the undercut.