The structure of the slender inserts in the injection mold with precision small holes

Abstract

The invention relates to a colliding structure for slim inserts of a product injection mould with small precise holes. The colliding structure comprises a fixed mould, a moveable mould matched with the fixed mould, and a plurality of inserts, wherein the fixed mould is fixedly connected with a fixed mould core; the moveable mould is fixedly connected with a moveable mould core; the inserts are composed of a fixed mould insert and a moveable mould insert; the fixed mould insert and the moveable mould insert are respectively fixed on the fixed mould core and the moveable mould core; a pair of positioning tapered lug boss and groove in mutually matched shape are arranged on colliding end faces of the fixed mould insert and the moveable mould insert along the axes; and when the fixed mould and the moveable mould are closed, the end faces are collided after the fixed mould insert and the moveable mould insert are spliced through the positioning tapered lug boss and the groove. The colliding structure provided by the invention has the advantages that: the problems of stiffness and strength of the slim inserts with collided small holes are effectively solved; the problems of the product injection mould that the needle is broken, the hole position precision cannot be ensured and the deckle edges are easy to occur on the holes are solved; the mould precision and the performance index are greatly increased; the stability Cpk of the critical size of an injection molded part is more than or equal to 4.27; and the service life is increased for 2-3 times.

Description

Technical field: [0001] The invention relates to a molding technology of plastics, and more specifically relates to a collision structure of elongated inserts of injection molds with precision small holes for plastic products. Background technique: [0002] With the rapid development of science and technology, products are constantly being updated. In electronic products such as communications and automobiles, the requirements for the molding quality of various spare parts are also getting higher and higher, not only in the appearance of the molded products, but also Performance in the internal structure of the product also put forward high-precision requirements. For example, in the mold design of some connectors, we often encounter small through holes with large aspect ratio arranged in a matrix. How can these small through holes with large aspect ratio ensure the accuracy of the hole position and the holes without burrs, and the long-term Since then, there has been no sa...

AI Technical Summary

Problems solved by technology

Due to the different shapes and sizes of product through holes, the fixed mold inserts and movable mold inserts are also different, and the parting surfaces formed by them may not be in the same plane. The contact method is often unable to withstand the high temperature and high pressure impact of the molten plastic flow, and the fixed and movable mold inserts are easy to shift, deform and break, which has a great negative impact on the efficiency and life of the mold

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