An injection mold for an automobile engine cylinder head cover

Abstract

The invention discloses an injection mold for an automobile engine cylinder head cover. The injection mold comprises a fixed mold assembly (1), a movable mold assembly (2), a side core-pulling device (3) and an inclined core-pulling device (4), wherein a cavity (13) of the fixed mold assembly, a core (24) of the movable mold assembly, the right end of a small inclined guide rod (257), the right end of a large inclined guide rod (258), a side core I (318), a side core II (326) and a side core III (335) of the side core-pulling device and an inclined core (48) of the inclined core-pulling device are combined and jointly define the injection-molded cavity of the automobile engine cylinder head cover. The injection mold can be applied to plastic pieces which are provided with long holes inconsistent with the mold opening direction, inclined pipe structures and concave structures (holes or chutes are formed in the outer walls of the concave structures) in the middles; manufacture and maintenance are facilitated under the base of one-mold two-cavity layout, the easily-worn parts are convenient to replace, the precision of the plastic pieces is ensured, and the maintaining charge of the mold can be reduced.

Description

technical field [0001] The invention relates to an injection mold, in particular to an injection mold for an automobile engine cylinder head cover, and belongs to the technical field of injection molding. Background technique [0002] The car engine is the heart of the car, providing power for the car to walk. The cylinder head of the car engine belongs to the gas distribution mechanism. Its main function is to close the upper part of the cylinder and form a combustion chamber with the piston top. With the emergence of the overhead valve engine, the cylinder head The cylinder head cover is the shield above the cylinder head, that is, the upper cover of the valve chamber, which can protect the valve lifters, cover and seal the cylinder head, keep the oil inside, isolate it from the air, and keep dirt and moisture, etc. Contaminants are kept out and act as an oil filler and sensor mount. [0003] The early cylinder head covers of automobile engines were all made of metal. In ...

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Problems solved by technology

[0004] Automobile engine cylinder head cover generally designs its shape and internal structure according to its function. According to the number of cylinder heads and the installation position, the automobile engine cylinder head cover is generally a structure with multiple grooves and holes inside and outside, and the structure is more complicated. And it is not easy to demould, and the processing is more difficult

[0005] In the prior art, the cylinder head cover of an automobile engine is generally formed by one-time injection molding. In order to improve production efficiency, a multi-cavity layout is often used. The manufacturing of a multi-cavity mold is more complicated than a single-cavity mold, and the manufacturing price will also increase according to the increase in the number of cavities. increase; and every time one cavity is added, the dimensional accuracy of the plastic part will decrease, so the layout of one mold and two cavities is generally adopted

[0006] Automobile engine cylinder head covers generally have structures such as side holes, side recesses and side bosses, which generally need to be formed by side core-pulling injection molds, so side core-pulling injection molds have always played a very important role in plastic molds , but the existence of the side core-pulling structure tends to increase the manufacturing cost and processing difficulty of the mold

[0007] The existing one-mold and two-cavity injection molds in the actual production process of automobile engine cylinder head covers, especially for the long holes that are inconsistent with the mold opening direction, the inclined tube structure and the concave structure in the middle. In the production of plastic parts with holes or grooves on the outer wall of the shaped structure, hydraulic lateral parting and core-pulling mechanisms are often used. The mold structure and manufacturing process are complex and difficult to demould; the mold core has a single function, inconvenient maintenance, and fragile The parts are not easy to replace, so it is difficult to ensure the accuracy requirements of plastic parts, and the service life of the mold is short; the production cost is high, and the maintenance cost of the mold is high

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