Demoulding device with spring-piece type tapered pin anti-breaking mechanism

Abstract

The invention relates to a demoulding device with a spring-piece type tapered pin anti-breaking mechanism, which comprises a moving die, wherein a core of the moving die is provided with a tapered pin through hole. The demoulding device is characterized in that a tapered pin in a square block form is arranged in the tapered pin through hole, the lower end of the tapered pin is provided with a transverse sliding chute which is connected with the upper end of a longitudinal push rod, a flange at the lower end of the push rod is arranged on a push plate fixing board with a step hole, an annular spring piece with an arc section is placed between the flange at the lower end of the push rod and the pushing plate fixing board, the pushing plate fixing board is fixed with the pushing plate through a bolt, and the tapered pin in the square block form obliquely slides in the tapered pin through hole under the actions of the pushing plate and the push rod, and can carry out transverse core-loosing demoulding while a finished product is ejected out. The invention can counteract over-drawing displacement generated by interference fit formed by the heating expansion of a tapered pin positioningsurface when the tapered pin returns by press elastic deformation of the annular spring piece with the arc section, avoids breaking the tapered pin, ensures that the tapered pin works stably, and prolongs the service life of the tapered pin.

Description

technical field [0001] The invention relates to a demoulding device with a shrapnel-type oblique pin anti-breakage mechanism, which is suitable for plastic product forming molds, especially for injection molds with barbs, grooves or protrusions. Background technique [0002] In the molding mold of plastic products, for the barbs and inner grooves on the inner surface of the product, the oblique pins are used to eject the mold. In the prior art, a square-shaped oblique pin is adopted, which slides obliquely in the through hole of the oblique pin under the action of the thimble push plate, and performs horizontal core-pulling and demoulding while ejecting the finished product. Because when the oblique pin is pulled back to the end point, the positioning surface of the oblique pin is matched with the through hole of the oblique pin with high precision. During the injection molding process, the positioning surface is thermally expanded between the movable mold core and the obliq...

AI Technical Summary

Problems solved by technology

Because when the oblique pin is pulled back to the end point, the positioning surface of the oblique pin is matched with the through hole of the oblique pin with high precision. During the injection molding process, the positioning surface is thermally expanded between the movable mold core and the oblique pin due to the high temperature of the molding. , forming an interference fit to produce over-tension displacement, and under the action of deformation stress that is often alternated between cold and heat, the oblique pin steel is brittle, so the positioning surface of the oblique pin is easy to cause over-tension fracture during the return process

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