Method for accurately and efficiently forming front sleeve type plastic part

Abstract

The invention discloses a method for accurately and efficiently forming a front sleeve type plastic part. The method comprises the following steps: S1, injecting a material in a molten state into a mold body, enabling the material to flow into a forming device along the top of the mold body, and carrying out injection molding in the forming device; S2, injecting cooling liquid into the mold body to form a double-spiral cooling water channel for rapid and uniform cooling; and S3, through upward jacking of a material jacking device, providing driving force to realize and in-mold hot cutting in the forming device. The forming device used in step S1 comprises a sprue bush, a shaping upper mold and a cooling mechanism. A hot runner plate and the sprue bush are combined to solve the problems that the mold temperature is too high, and one-mold multi-cavity forming cannot be achieved, the problems of key position coaxiality and size precision are solved by adopting a three-plate matched machining and four-wall buckling method, and the problems that a disc type sprue is not easy to cut off and manual cutting is high in cost and long in period are solved by adopting in-mold hot cutting.

Description

technical field [0001] The invention relates to the field of methods for forming plastic parts such as front sleeves, in particular to a method for precisely and efficiently forming plastic parts such as front sleeves. Background technique [0002] For the front sleeve, its key dimensions and tolerances need to be controlled within 0.01mm, and it also has the requirements of coaxiality and roundness. Due to the thin wall thickness of the adjacent structure, it is difficult to control the dimensional accuracy and shape tolerance during the molding process. Defects such as insufficient roundness and dimensional deviation often occur. [0003] The front sleeve used in the existing market is usually solved by three-plate mold or hot runner mold, but due to the limitation of mold structure and temperature distribution, it is still unable to solve or fail to meet the above-mentioned dimensional accuracy and shape tolerance requirements, usually by reducing the number of mold cavit...

AI Technical Summary

Problems solved by technology

[0002] For the front sleeve, its key dimensions and tolerances need to be controlled within 0.01mm, and it also has the requirements of coaxiality and roundness. Due to the thin wall thickness of the adjacent structure, it is difficult to control the dimensional accuracy and shape tolerance during the molding process. Defects such as insufficient roundness and size deviation often occur

[0003] The front sleeve used in the existing market is usually solved by three-plate mold or hot runner mold, but due to the limitation of mold structure and temperature distribution, it is still unable to solve or fail to meet the above-mentioned dimensional accuracy and shape tolerance requirements, usually by reducing the number of mold cavities way to shape

As a result, production efficiency is low and dimensional and shape accuracy is insufficient

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