Injection molding method and injection molding die for thick plastic parts

Abstract

The invention relates to an injection molding method and injection molding die for thick plastic parts. The plastic injection molding method and injection molding die are mainly applied to molding ofthick plastic parts with a thickness of more than 4 mm. According to the invention, the molding die is provided with at least one primary blank mold cavity and a finished product mold cavity at the same time, wherein the thickness of the primary blank mold cavity must be less than the thickness of a finished part; after opening of the molding die is opened, a primary blank is moved from the primary blank mold cavity into the finished product mold cavity; then the primary blank in the finished product mold cavity and the primary blank mold cavity are simultaneously subjected to injection coating and injection molding; and after die-closed pressure maintaining and cooling, the primary blank and the finished part are simultaneously produced. With such an injection molding manner, pressure maintaining and cooling time during injection molding can be greatly shortened, so production cost can be significantly lowered and production capacity can be improved.

Description

technical field [0001] The invention relates to the technical field of optical plastic molding, in particular to a thick plastic injection molding method with a thickness exceeding 4 mm and a mold thereof. Background technique [0002] The general plastic injection molding is to inject at least one mold cavity, a flow channel and an injection port in a pair of molding molds. After the granular plastic raw materials are heated to become fluid, the fluid plastic is injected into the mold by means of a screw mechanism. In the forming mold, that is, the fluid plastic has to go through the injection port and the flow channel, and finally reach and fill the cavity, and then cool the fluid plastic in the cavity through a cooling water channel set in the forming mold, so that The fluid plastic is finally formed into a solid and then released from the mold to become a finished plastic part, thus completing a cycle of plastic injection molding. [0003] Furthermore, generally for the...

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Problems solved by technology

[0003] Furthermore, generally for the plastic injection molding of thick parts, one injection machine is used together with a set of molds, and one-stage injection molding is used, pressure is kept to prevent shrinkage, and the mold is opened after cooling and solidification. Due to the thickness of the finished product, it is necessary to A long holding time and cooling and solidification time are used to avoid "shrinkage marks" on the surface of the product, so the entire injection molding cycle time is long, making the process cost of producing thick products high and the production volume low, making thick plastic products The unit price of finished products is high

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