Hot runner injection method of plastic part with side core-pulling and forming mold thereof

Abstract

The invention provides an injection method used for a plastic part hot runner which requires lateral core drawing; during the die opening process, as an elastic ejecting device is arranged between a hot runner plate and a concave die, the concave die is forced to generate the displacement correspondingly to the hot runner plate prior to a convex die and drives the sliding block of a sliding blockcore drawing mechanism to move externally by a stroke required by the core drawing, thus completing the side core drawing action; the forming die used for the injection method comprises the hot runner plate, the concave die and the convex die; a sliding block core drawing mechanism and an elastic ejecting device are arranged between the hot runner plate and the concave die; the sliding block of the sliding block core drawing mechanism generates the displacement to the external side when moving in the die opening direction and generates the displacement to the internal side when moving along the die opening direction; the injection method of the invention is especially applicable to the plastic parts where the injection side surface has large-area openings or hollows and the core drawing stroke is short.

Description

technical field [0001] The invention relates to a hot runner injection method for plastic parts requiring side core pulling, in particular to a hot runner injection method for plastic parts with large-area openings or depressions on the side; it also relates to its forming mold, and more specifically relates to The invention relates to a hot runner injection molding mold which uses the principle of three-plate mold structure to complete side core pulling. Background technique [0002] Hot runner injection molding mold, because the hot runner technology is an advanced technology applied to the pouring channel system of plastic injection mold, it is a hot direction in the development of plastic injection molding process. The so-called hot runner molding refers to relying on the separate heating of the hot runner, the plastic sent from the nozzle of the injection machine to the gate is always in a molten state, and does not need to be solidified every time the mold is opened an...

AI Technical Summary

Problems solved by technology

However, for side core-pulling of plastic parts with large openings or depressions on the side, and to prevent reverse thrust during injection, a large-tonnage oil cylinder must be used to ensure stable and reliable core-pulling action, which will inevitably increase costs, and Large-tonnage oil cylinders still need to occupy space. Under the premise that the mold needs to be equipped with at least one large-area side core-pulling mechanism, it is difficult to arrange space for installing large-tonnage oil cylinders.

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