The Study Of Cylinder Tube's Non-Resin Winding Preforming Technique

In this dissertation, the technology of cylinder non-resin winding preforming was put forward and studied comprehensively and systematically. This technology was established under the requirement of fast producing, low cost manufacture and large thickness preforming in the field of cylinder composite.The technology of cylinder non-resin winding preforming was based on the traditional circular helix winding technology. But this new technology of cylinder non-resin winding preforming got rid of the process of resin soaking (and drying). It was a new explore of directly wind by yarn without resin or yarn only with some water. On the base of non-resin winding preforming experiments, this dissertation summarized and analyzed possible problems in non-resin winding preforming. Feasibility and significance of cylinder non-resin winding preforming was also analyzed and discussed.Considering the significance of yarn stability problem in non-resin winding technology, a spatial mechanics model was established. And by means of calculus and differential geometry theory, mechanics analyzing was achieved in different plane during the non-resin winding process. Furthermore, the mechanics balance requirement of non-resin winding was deduced.In the study of stability, the factor of instability in traditional winding which named relax inside and tightness outside was analyzed. Under the model of yarn layer pressure which emphasized particularly on pressure between different yarn layers, the gradient descent formula of winding tension was brought forward for realizing of equal yarn stress. Under the model of increasing winding radius which took increasing winding radius into account only, the transformation trend of winding tension was deduced and calculated. And the velocity modifying formula was put forward, which was fit for large thickness cylinder preforming. Obviously, this formula also achieved indirectly control of winding tension.Depending on section partition theory in tradition winding technology, the principle of three sections in non-resin winding was established in the dissertation. And the length of three sections and displacement difference between drop-yarn point and draught-yarn point in different retracing curves were calculated and deduced. Using tangent point method and standard line method in line type analyzing of traditional winding technology for reference, the method of same orientation tangent point analyzing inwhole track was put forward under the three sections principle. And by means of this method of same orientation tangent point analyzing in whole track, the formula of line type and winding rule for non-resin winding were deduced.Finally, the special CAD (Computer Aid Design) software for non-resin winding technology was developed on the base of formulae and arithmetic acquired in above paragraphs. The functions of the software included stability analysis, parameter calculation, process design, planar technology diagram output and 3D (three-dimensional) simulation, and so on. The software had abundant functions and good compatibility. Anyway, it could decreased man-made and subjective guesstimate, reduced the working intensity, optimized the parameter design and even shortened the process period, reduced producing cost and improved the manufacture efficiency.