Internal pulling type double-color injection mold

Abstract

The invention discloses an internal pulling type double-color injection mold which comprises a front mold, a rear mold, ejection mechanisms, loose cores, fixing blocks and needle plate driving mechanisms. Each ejection mechanism is arranged on the front mold side and comprises a needle plate, ejector rods and an ejector block, wherein the ejector block is arranged in the front mold in an embeddedmode, the needle plate is located on the side, away from the rear mold, of the ejector block, and the ejector block is fixedly connected with the needle plate through the ejector rods. The loose coresare arranged in the ejector blocks and are in sliding fit with the ejector blocks, and the included angle between the relative movement direction of each loose core and the corresponding ejector block and the mold opening direction is an acute angle. The fixing blocks are located at the ends, away from an injection molding cavity, of the loose cores and detachably and fixedly connected with the front mold, and one side of each fixing block is hooked to the corresponding loose core. The needle plate driving mechanisms are arranged outside the front mold and the rear mold, one end is connectedwith the needle plate, and the other end is connected with the rear mold. A double-color product piece is prevented from being damaged by direct ejection during mold opening, the structure is simple,mold opening motion is used to drive the loose cores to retreat from an inverted buckle state, the steel consumption is reduced, the cost and the process difficulty are reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of injection molds, in particular to an internally drawn two-color injection mold. Background technique [0002] The two-color injection mold is used to form an injection product with a combination of hard rubber and soft rubber. The rear mold of the two-color injection mold has two rear mold cavities, and the front mold of the two-color injection mold has two front mold cores. Each of the rear mold cavities can be matched with the two front mold cores respectively. The injection molding process is divided into two parts. First, the hard plastic parts are injected and molded. After the mold is opened, the hard plastic parts stay in the rear mold. The injection molding machine drives the rear mold to rotate 180° and then closes the front mold. There is a rear mold cavity with hard plastic parts. Cooperate with another front mold core to form a soft injection molding cavity. After injecting soft glue, the sof...

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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to propose an internally drawn two-color injection mold, which solves the problem of large undercuts of product parts, direct ejection after mold opening will damage the product parts, and the structure of the core-pulling drive mechanism is complicated. , high manufacturing cost and difficult process

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