Injection molding production method of transparent product with thick-walled curved surface structure

A technology for injection molding and transparent parts, which is applied in the field of injection molding of transparent plastic parts. It can solve the problems of difficult realization of curved surface structure and small size of thick-walled transparent parts, so as to avoid vacuum bubbles and reduce warping deformation. and optical imperfections for precisely controlled effects

Active Publication Date: 2015-05-20
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

[0003] The purpose of the present invention is to provide an injection molding manufacturing method of thick-walled precision transparent parts to solve the

Method used

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  • Injection molding production method of transparent product with thick-walled curved surface structure
  • Injection molding production method of transparent product with thick-walled curved surface structure
  • Injection molding production method of transparent product with thick-walled curved surface structure

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Embodiment

[0026] The thickness of the injection molded part is 10mm, and the shape of the injection molded part is as attached figure 2 shown;

[0027] (1) The gate of the injection molded part is located in the edge area, and its shape adopts a slit expansion structure with a continuous step change in thickness, as shown in the attached figure 1 As shown, the glue injection point 1 is located on the side close to the maximum thickness of the gate, the maximum thickness of the gate is 20mm, the minimum thickness of the gate is 7mm, and the length of the gate is 50mm; Move the platen back to expand the mold cavity until the parting surface gap is 5mm, the mold temperature rises to 160°C, and the screw advances 5mm / s-10mm / s-20mm / s low-speed multi-stage injection filling. By adjusting the screw back pressure and the screw Stroke and other parameters, so that the injection volume is 108% of conventional injection molding; (3) The holding pressure of the screw after filling is 105%-120% of...

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Abstract

The invention relates to an injection molding production method of a transparent product with a thick-walled curved surface structure, and in particular relates to an injection molding production method of a transparent plastic product with a complex curved surface, high surface quality requirement and good optical property. According to the injection molding production method provided by the invention, a sprue with a slit expansion type structure and a continuous stepwise variation thickness is adopted, so that the problems of a jetting phenomenon of melt filled for molding a thick-walled product and incomplete filling and insufficient injection caused by premature cooling of the sprue are avoided. The melt filling resistance can be effectively reduced by expansion of a mould cavity and low-speed injection, so that the orientation of molecular chains of materials and the flow-induced residual stress of the product are reduced, and the buckling deformation and optical defects caused by the stress are reduced. Compression action subjected to equal pressure control is achieved on the whole molded surface of the mould cavity, a role in compensating cooling shrinkage of the product can be played, so that the residual stress caused by pressure maintaining of a screw rod is reduced, the size precision of a geometric shape is guaranteed, and the high-precision production and molding of the product can be achieved.

Description

technical field [0001] The invention relates to an injection molding manufacturing method of a thick-walled curved surface transparent part, in particular to an injection molding manufacturing method of a transparent plastic part with a complex curved surface, high surface quality requirements and good optical performance. Background technique [0002] A large number of transparent parts are used in the fields of aerospace, automobile industry, and marine ships. Among them, the observation and lighting systems have high requirements on the performance of transparent parts, and the shape of the parts is also very complicated. Curved surface shape, large thickness geometric structure and high optical performance require good surface quality, light transmission, small optical distortion, no bubbles and air marks, low residual stress, and high three-dimensional dimensional accuracy. Good impact resistance and pressure resistance, all of which put forward higher requirements on m...

Claims

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Application Information

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IPC IPC(8): B29C45/77B29C45/27B29C45/72B29C45/73
Inventor 王韬颜悦厉蕾葛勇
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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