Novel3D Braiding Process Equipment Based On Space Group P(3|-) Symmetry

3D braided composites have the characteristics of high specific strength andspecific modulus, high damage tolerance and fracture toughness, impact resistance,non-hierarchical, anti-crack and anti-fatigue.3D braiding technology which can formcomplex parts and reduce the amount of secondary processing has excellent designableperformance by changing the density and orientation angle of the braiding yarn toachieve the desired mechanical properties. Therefore,3D braiding technology washighly regarded in the aerospace, transportation, defense and health care, sports andother fields. However, the3D braiding method was limited to four-step and two-stepbraiding process and new braiding process must be developed.Novel3D braiding process based on space groupP(3|-)symmetry was developedby our research group when research geometric structure of braided materials usingsymmetry group theory.3D braiding process was proved feasible by experimentalverification.3D braided composites based on space groupP(3|-)symmetry which havehigh fiber volume fraction and stable structure were better than composites based onfour-step braiding method. Plate3D braiding process based on space group P(3|-)symmetry and the technological equipment were studied.The mechanical structure, transmission mechanism and control system of thetechnological equipment were designed to meet the plate3D braiding processrequirement based on the space group P(3|-) symmetry. Two design schemes of thetechnological equipment workbench were proposed and models of the fabric based onthe two schemes were established. Physical properties of two kinds of fabric werecalculated and compared with each other. Geneva mechanism was designed accordingto the characteristics of technological equipment and the solution of long transmissionchain error accumulation was proposed.3D fabric braiding by multi-functional three-dimensional multi-directional braiding equipment provided experimental basis for the process of plate3D based onspace groupP(3|-)symmetry and laid the foundation for industrial application of thetechnological equipment base on the novel process. The development of novelequipment provides technical support for diversification of3D braiding compositematerials.