Method for improving printing and forming quality of FDM and implementation device

Abstract

The invention relates to a method for improving printing and forming quality of a FDM and an implementation device. The method adopts methods of excitation, synchronous compaction and printing quality detection and feedback; and forming quality is improved through stages such as a printing wire melting process and a printed part forming process. The implementation device of the method comprises mechanisms of excitation, synchronous compaction and quality detection. Through the excitation mechanism, a mixture of fibers and molten resin vibrates in the wire melting process, so that gas pores are reduced, melting wettability of the resin and the fibers is improved, and head blocking probability is reduced; the compaction mechanism with a rolling ball can improve combination strength among printing layers, so that instant compaction in any direction in the printing process is realized; and a compaction temperature, and a distance between the rolling ball compaction surface and the printing forming surface can be precisely adjusted. Besides, printing quality information can be obtained in real time through the quality detection mechanism integrated at the outlet of a spray head, and defects can be accurately positioned and judged to optimize printing parameters, so that the non-qualified rate of finished products is reduced.

Description

technical field [0001] The invention belongs to the intersecting field of additive manufacturing technology and composite materials, and specifically relates to a method and a device for improving the quality of FDM printed molded parts. Background technique [0002] The emergence and development of additive manufacturing technology has revolutionized the traditional manufacturing mode, which has the characteristics of rapid prototyping of complex parts and molds, and low cost. According to the division of printing process, it can be divided into selective laser sintering (Selective LaserSintering, SLS), powder droplet jetting (Three dimensional printing, 3DP), stereolithography (Stereolithography, SLA), fused deposition manufacturing (Fused Deposition Modeling, FDM ), laminated object manufacturing (Laminated Object Manufacturing, LOM), etc., in which fiber-reinforced resin fused deposition 3D printing technology is a key part of additive manufacturing technology, which can...

AI Technical Summary

Problems solved by technology

[0003] However, in the actual printing process, there are often gaps in the resin, and the fibers and resin are not fully infiltrated, which leads to low strength of the printed composite material; due to the layered manufacturing, the interlayer bonding is moved by the printing nozzle and extruded tow Bonding is achieved, there is inevitably a high temperature difference between the newly printed tow and the bottom layer, and there is a lack of compaction force between layers. These factors lead to weak bonding strength between layers, which seriously restricts its wider application.

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