A mold structure for automatic shear gate of plastic pipe fittings

Abstract

The invention relates to the technical field of injection molds, in particular to a mold structure capable of automatically shearing a sprue in a mold for a plastic pipe. The mold structure capable ofautomatically shearing the sprue in the mold for the plastic pipe comprises a movable mold body, a fixed mold body, a pulling core A and a pulling core B, wherein the pulling core A and the pulling core B are connected to the movable mold body in a sliding mode; a blade which corresponds to the sprue and is used for cutting off the sprue is connected and fixed to the movable mold body; and the pulling core B drives the plastic pipe to move towards the blade after the pulling core A and the movable mold body are separated from the plastic pipe, so that the blade cuts off the sprue which is connected to the plastic pipe. According to the mold structure capable of automatically shearing the sprue in the mold for the plastic pipe, a scraper plate is arranged and fixes the blade, the plastic pipe moves in the core de-molding direction under the holding force of the core to the position of the blade to cut off the sprue, and therefore the phenomena that the plastic pipe is inclined and thelike can be avoided, and the cutting position is stable and accurate.

Description

technical field [0001] The invention relates to the technical field of injection molds, in particular to an in-mold automatic shear gate mold structure for plastic pipe fittings. Background technique [0002] In the mold industry, various molds and tools are used to obtain the required products by injection blow molding, extrusion, die-casting or forging, smelting, stamping, etc. In short, molds are tools used to make shaped objects. This kind of tool is composed of various parts, and different molds are composed of different parts. In the plastic mold manufacturing industry, there are more and more plastic products with appearance parts. The requirements for this kind of appearance parts are very strict. Flow marks, burrs, gates, etc., which put forward higher requirements for the manufacture of plastic molds. [0003] After the injection molding of the product in production, there is still a gate on the product, such as a lap gate or a side gate. The plastic outside the g...

AI Technical Summary

Problems solved by technology

[0005] The automatic shearing side gate mechanism in the pipe injection mold needs the thimble to eject the formed pipe first, and then the cylinder drives the cutter to complete the shearing. When the pipe is tilted during ejection, it is agreed that the pipe is not in place and easy to cut. Scratch the molding surface of the pipe fittings, and the mold needs to install the position of the cylinder, which increases the external size of the mold and requires a larger injection molding machine, which increases the cost

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