Precision mold for multiple times of injection of single melt

Abstract

The invention belongs to the technical field of rubber and plastic injection molding molds, and relates to an injection molding mold, in particular to a precision mold for multiple times of injectionof single melt. According to the mold, insert guide rails of an outer drive mold are adopted for indirectly controlling the change of the size of a mold cavity; a sprue cutoff device is adopted by themold and can cut off a cold sprue of the single time of injection of the single melt, and it is guaranteed that a runner is smooth at next time of injection; and the insert guide rails cooperate withthe sprue cutoff device, multiple times of injection molding of the single melt can be completed, and size precision control of an ultralarge-thickness or variable-thickness product is achieved. According to the precision mold for multiple times of injection of the single melt, the melt filling and densification process of the ultralarge-thickness or variable-thickness precision product can be effectively achieved, research and development of related new products are facilitated, and a multi-color injection molding machine is not needed; and the mold structure is simple, the equipment and mold cost is saved, and the mold is suitable for production of multiple varieties and small batches of products.

Description

technical field [0001] The invention belongs to the technical field of rubber and plastic injection molding molds, and relates to an injection molding mold, in particular to a precision mold for multiple injections of a single melt. Background technique [0002] Observation windows in the deep sea exploration and aerospace fields, oil pipeline fittings in the petroleum and petrochemical field, and large water treatment filter plates in the environmental protection field are all relatively thick (the thickest can reach nearly 100 mm). The shrinkage rate is large, and defects such as surface sink marks, local vacuum bubbles, and warping deformation often occur during the injection molding process, which requires comprehensive consideration from product design, process optimization, and mold design. It is technically difficult to produce the above-mentioned ultra-thick-walled products by traditional injection molding, and the corresponding manufacturing cycle is long and the mo...

AI Technical Summary

Problems solved by technology

It is technically difficult to produce the above ultra-thick-walled products by traditional injection molding, and the corresponding long manufacturing cycle and high mold cost

[0003] At present, multiple injection molding molds mainly involve multi-color injection or overmolding injection, the mold structure is complex, and multi-color injection machines are needed to realize

For example, Patent No. CN201410331919.9 discloses a method and equipment for manufacturing thick-walled optical elements, which requires more than two injection processes or injection units to complete material pouring, and additional cooling stations are required between different injection processes to ensure The preform is fully cooled. This solution is based on the precision turntable mold and the gripping and positioning of the manipulator. The mold design and processing are difficult, and the cost of automation equipment is high. It is not suitable for small batch production and early technology development of ultra-thick-walled products. use

Patent No. CN201510654476.1 discloses a multi-melt multi-injection mold. By setting the first injection runner and the second injection runner on the gating system, it can be realized without using a two-color injection molding machine. Sequential injection molding of two materials is proposed. This solution has certain limitations in mold design and product development that require three or more injections, and the precision and automation control of the molding process is not good enough to adapt to stable small batch production.

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