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Method for regulating and controlling polymer injection cell structure by utilizing 3D printing and product

A 3D printing and polymer technology, used in manufacturing auxiliary devices, processing data acquisition/processing, additive processing, etc., can solve problems such as deformation and failure of 3D printing parts, achieve good consistency, solve poor interface performance, Small product warpage effect

Pending Publication Date: 2022-05-27
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the combination of 3D printing and foam injection molding also faces corresponding technical difficulties. For example, compared with ordinary injection, foam injection generally requires rapid injection, which is easy to cause pre-placed 3D printed parts to be damaged during foam injection. Deformation during the process leads to failure; how to design the structure of 3D printed parts to be more conducive to the shape of cells; how to improve the performance of 3D printed parts and lead to better performance of combined parts; Whether the interface between the materials is firm, etc.
[0005] It can be seen from the above that the development of the combined manufacturing process of 3D printing and foam injection molding has great research significance and engineering value, and it is also a challenge for researchers and industrial practitioners to realize the perfect combination of the two

Method used

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  • Method for regulating and controlling polymer injection cell structure by utilizing 3D printing and product
  • Method for regulating and controlling polymer injection cell structure by utilizing 3D printing and product
  • Method for regulating and controlling polymer injection cell structure by utilizing 3D printing and product

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Embodiment 1

[0035] The cell structure control method described in this embodiment mainly involves a combined manufacturing technology of injection foam molding and 3D printing. In terms of equipment, an ordinary injection machine and 3D printer are required. The cavity shape of the mold used is the dog-bone shape used for standard tensile splines, and the raw and auxiliary materials used are all commercially available. The material used is thermoplastic resin: PP, its tensile strength is 27.5MPA, the heat deformation temperature is 100 degrees, and the melting point is 165 degrees. The FDM process used in 3D printing, the material selected is PLA, and the heat deformation temperature is 80 degrees. The tensile strength is 42.6MPA, and the foamed gas comes from the self-made foaming masterbatch. The process route diagram of the present invention is as follows figure 1 shown.

[0036] First, according to the shape of the mold cavity, the structure of the 3D printed part is designed, which...

Embodiment 2

[0062] Example 2 is similar to Example 1, except that supercritical carbon dioxide is introduced into the barrel of the injection machine, so that the foaming raw material used is a foamable raw material containing supercritical carbon dioxide. Similarly, an integrated composite product is obtained, the cross-sectional results of which are as follows Figure 8 , from which it can be seen that the cell distribution of the post-injection material after foaming is characterized by a vertical orientation along the direction of the 3D printed parts, which is closely combined with the 3D printed parts. The mechanical properties of the article were tested, and its tensile strength was 34.5MPA.

Embodiment 3

[0064] Embodiment 3 is similar to Embodiment 1, except that variable speed printing is not used in the printing process. Similarly, an integrated composite article is obtained. The mechanical properties of the article were tested, and its tensile strength was 32.8MPA.

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Abstract

The invention discloses a method for regulating and controlling a polymer injection foam structure by utilizing 3D printing, which mainly comprises the following steps of: (1) according to requirements and structural characteristics, specially designing a workpiece with a cavity structure and a placing part, and processing and manufacturing the workpiece by utilizing a 3D printing method; (2) putting the printed part into a mold; (3) mixing the thermoplastic plastic to be foamed with gas to form a gas melting compound; (4) injecting the gas-melted compound into a cavity of the printed part in the mold to form a combined material; and (5) after a certain period of time, the mold is opened, and a corresponding foaming workpiece is obtained. The invention also discloses a polymer foaming injection product for regulating and controlling the foam structure by using the method, and the mechanical property of the product is obviously superior to that of similar products.

Description

technical field [0001] The present invention relates to an injection molding manufacturing method and products thereof, in particular to a method for regulating and controlling polymer injection cell structure by 3D printing and its products. Background technique [0002] Polymer foam materials refer to microporous materials based on polymers (plastics, rubbers, elastomers or natural polymer materials) with countless air bubbles inside them, and can also be regarded as composite materials with gas as filler. Due to the needs of shock resistance, sound insulation, heat insulation, light weight, etc., forming numerous fine cells inside the product can significantly expand the application range of plastic products. Polymer injection molding is a general product processing method, and foam injection molding can quickly form such products with a microcellular structure. Therefore, the application of polymer foam injection products is becoming more and more extensive. However, fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/12B29C44/34B29C44/42B29C44/60B29C64/386B33Y50/00
CPCB29C44/12B29C44/34B29C44/42B29C44/60B29C64/386B33Y50/00
Inventor 周应国李亚宁
Owner JIANGSU UNIV OF SCI & TECH
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