Research On 3D Spacer Woven Fabric Structure And Virtual Prototype Of Weaving Machine

Most of the traditional light weight composites are honeycomb sandwich structure and foam sandwich structure. The composite preform is mainly manufactured by ply sewing methods, and low velocity impact or shear loads usually causes delamination failure in the process of use. In order to overcome these shortcomings, using three-dimensional weaving method weaves 3D spacer fabric structure as the composite perform. It not only has light weight and high strength characteristics, but also has good integrity, inter layer and anti-impact performance.Compared with the 2D fabric structure, the pattern law of 3D spacer fabric is complex,and structure form is more. But it is usually interwoven by multi-layer warp and weft together, after weaving is completed, weft is pushed to woven cloth-fell smoothly.Therefore, the design of the shedding mechanism, weft insertion mechanism and beating-up mechanism become the key of the development and research of the 3D weaving machine. The cam mechanism, linkage and the combination of the two mechanisms can be used for the shedding mechanism, weft insertion mechanism and beating-up mechanism.According to the pattern law of the fabric, how to determine the optimal combination of mechanism form, determine the optimal parameters of mechanisms, and do the structure design of mechanisms is the key to the development of the three-dimensional weaving machine, and it is also the main purpose of this thesis.This thesis mainly studies rectangular spacer fabric, introduces its fabric structure,weaving process and principle. In order to weave this kind of fabric structures, it focuses on the design and simulation study of three-dimensional weaving machine virtual prototype. The main contents of this thesis are as follows:Firstly, the thesis designs the rectangular interval woven fabric structure, establishes3 D model of the fabric, and determines the weaving process and weaving principle;Secondly, aiming at different width and different pattern contexture of spacer woven fabric, it develops four kinds of virtual prototype model of the 3D weaving machine. The simulation design and optimization of the parts of mechanisms for loom are carried out,and the optimal parameters of the mechanisms is determined. With the help of Pro/E、CATIA and Solid Works establishes the model of the three-dimensional weaving machine;Thirdly, in the development process of three-dimensional loom, two kinks of shedding mechanisms, nine kinds of beating-up mechanisms and four kinds of weft insertion mechanisms are designed;Fourthly, this thesis is aiming at series of heald frame for the rapier loom. The dynamic characteristic analysis and comparison of the aluminum alloy, carbon fiber composite material and aluminum alloy composite,and carbon fiber composite structure heald frames are performed in ANSYS software. The layer design and analysis of 190 cm width of heald frame is carried out by ANSYS classic version and ACP module in the ANSYS Workbench;Lastly, the dynamic characteristic analysis of different type of frames are carried out in ANSYS Workbench, and it provides a reference for improving the vibration resistance of frames.