Injection mold with side gate valve needle and injection molding method

Abstract

The invention discloses an injection mould with a side sprue valve needle and an injection molding method. The injection mould comprises a fixed molding board and a movable molding board corresponding to the fixed molding board, wherein a side spray nozzle fixing plate positioned on the side surface of a mould cavity is arranged on the fixed molding board; a side spray nozzle is arranged in the side spray nozzle fixing plate; a side spray nozzle block is arranged on the side spray nozzle; a spray nozzle head is arranged in the side spray nozzle block; an opening-closing valve needle is arranged in the spray nozzle head; an air cylinder assembly and a starting valve needle which is connected with the air cylinder assembly for linkage are arranged on the fixed molding board; and the tail end of the starting valve needle is provided with an inclined-surface slide slot corresponding to the tail end of the opening-closing valve needle. In this way, according to the injection mould with the side sprue valve needle and the injection molding method, the structure is compact and the mounting is quick; by virtue of multi-stage flexible control on the air cylinder assembly, molten resin is prevented from being cured in a side spure, so that the demolding effect and the product quality are improved.

Description

technical field [0001] The invention relates to the field of injection molding, in particular to an injection mold with a side gate valve needle and an injection molding method. Background technique [0002] In the design of plastic products, when the top or bottom of the product does not allow gate marks, the side gate design will be used, and in order to improve the efficiency and quality of injection molding, hot runner injection molding with valve gate is usually used system. [0003] The side gate direction of the side gate hot runner injection mold is different from the opening and closing direction of the mold, which makes it very difficult to install the valve needle device of the side gate, and some side gate valve needle devices require a very large installation space. As a result, the overall size of the mold becomes larger, and the assembly and disassembly operations in different positions and different axes are very complicated and difficult, and there are many...

AI Technical Summary

Problems solved by technology

[0003] The side gate direction of the side gate hot runner injection mold is different from the opening and closing direction of the mold, which makes it very difficult to install the valve needle device of the side gate, and some side gate valve needle devices require a very large installation space. As a result, the overall size of the mold becomes larger, and the assembly and disassembly operations in different positions and different axes are very complicated and difficult, and there are many joints with other parts, resulting in an increase in the number of parts purchased to prevent glue leakage at the joints

[0004] In addition, according to the traditional molding method, part of the resin in the cavity will be immersed in the front end of the gate and solidified in the gate. This part of the cured resin will be stuck at the gate when the mold is opened to take out the product, resulting in the failure to take out the product smoothly. , if it is taken out forcibly, there will be bad undercuts on the surface of the product

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