Under-cut demolding device for straightly pulling and transversely extracting injection mold

Abstract

The invention discloses an under-cut demolding device for straightly pulling and transversely extracting an injection mold. The demolding device comprises two under-cut core blocks (1), two straight-pulling slide blocks (2) and an oil cylinder (2). The technical scheme is adopted as follows: a molded surface is arranged on the centrifugal side surface of each under-cut core block; an inclined slide rail is arranged on the centripetal side surface of each under-cut core block; an inclined slide groove corresponding to the inclined slide rail is formed in the centrifugal side surface of each straight-pulling slide block; the two straight-pulling slide blocks are respectively arranged in vertical mounting grooves formed in the left side surface and the right side surface of a mold core; the lower surfaces of the straight-pulling slide blocks are connected with a piston rod of the oil cylinder; a cylinder body of the oil cylinder is fixedly connected with a movable mold support plate; the two under-cut core blocks are arranged in horizontal mounting grooves in the left side surface and the two side surface of the mold core, and are in sliding fastened connection with the straight-pulling slide blocks through inclined slide rail grooves; the oil cylinder pulls the straight-pulling slide blocks downwards during working; the straight-pulling slide blocks drive the under-cut core blocks to transversely move along the horizontal mounting grooves through the inclined slide rail grooves in a centripetal manner, so that the under-cut core blocks are transversely extracted from an under-cut structure in a product; and then the product is pushed out from a top plate and a top rod upwards, and thus, due to the injection mold with a plurality of under-cut demolding devices, the shape is reduced, and the cost is lowered.

Description

technical field [0001] The invention relates to an undercut core-pulling stripping device for an injection mold, in particular to an injection mold for pulling a core-pulling block from an underturn structure inside a product for core-pulling and stripping. mold device. Background technique [0002] In the prior art, an inclined top core-pulling device composed of an inclined ejector rod and an inclined top slider is used to realize the molding of the internal undercut structure of the product and the demoulding of the inclined top core-pulling; because the inclined top core-pulling device needs to occupy a large internal space of the mold For automotive lampshade products with upturned left and right sides inside the product, the internal space of the mold is too cramped. As a last resort, the shape of the mold is enlarged to accommodate two sets of inclined top core-pulling devices at the same time to meet the left and right sides of the product. The oblique top core-pull...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, an inclined top core-pulling device composed of an inclined ejector rod and an inclined top slider is used to realize the molding of the internal undercut structure of the product and the demoulding of the inclined top core-pulling; because the inclined top core-pulling device needs to occupy a large internal space of the mold For automotive lampshade products with upturned left and right sides inside the product, the internal space of the mold is too cramped. As a last resort, the shape of the mold is enlarged to accommodate two sets of inclined top core-pulling devices at the same time to meet the left and right sides of the product. The oblique top core-pulling requirement of side undercuts increases the shape of the mold and the cost is high; the mold with a large shape must use a large-sized injection molding machine during production and operation, resulting in a further increase in operating costs. Therefore, the existing technology has Big, high-cost problems and deficiencies

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