Abstract
Aiming at the limited mechanical properties of general thermoplastic 3D printed models, a 3D printing process method for selective enhancement of continuous carbon fiber composite material is proposed. Firstly, the selective enhanced double nozzle working mechanism and crafts planning process are put forward. Then, based on the double nozzle carbon fiber 3D printing device, test samples are printed by polylactic acid (PLA) and carbon fiber material, and the test samples are enhanced by inserting layers of continuous carbon fiber material. The performance test of the samples is carried out. Experiment results show that when the volume fraction of continuous carbon fiber material increases gradually from 5% to 40%, the tensile strength increases from 51.22 MPa to 143.11 MPa. The performance improvement curve is fitted through experimental data. Finally, field scanning electron microscopy is used to observe the microscopic distribution of continuous fibers in the samples. The results of the research lay the foundation for the performance planning of 3D printed models.
Highlights
In the 30 years of the development of additive manufacturing technology, 3D printing has gradually broken through the product design concepts for manufacturing process and achieved the product design concepts for the performance of products [1]
The results showed that continuous fibers had a considerable degree of enhancement on the flexural strength and tensile strength of thermoplastic materials [24]
The research for long-fiber 3D printing in the world is mainly based on the printing of single-filament bundle carbon fiber
Summary
In the 30 years of the development of additive manufacturing technology, 3D printing has gradually broken through the product design concepts for manufacturing process and achieved the product design concepts for the performance of products [1]. Proposed a printing method for continuous carbon fiber composite models by modifying the 3D printer extrusion head to achieve long fiber bundle printing. Continuous carbon fiber and PLA filaments were used as the reinforced phase and matrix respectively, and they were simultaneously extruded by FDM 3D printing process to achieve integrated preparation and the forming of composite materials [21]. The research for long-fiber 3D printing in the world is mainly based on the printing of single-filament bundle carbon fiber In this way, the forming time is long, the printing cost is high, and the model cannot be selectively enhanced. Different layers can be flexibly selected to print the reinforced material, and the appropriate filling method can be selected according to the selective insertion of continuous carbon fiber composite material into thermoplastic material, the specific enhancement method is proposed and the performance test is designed
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