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Thus the trajectory of the spin-ning point is not a straight line but a plane curve. The spinning point moves forward toward the axe in accordance with the changes of the inlet outline as the main axe rotates. Fig.6 and Fig.7 show the simulation picture and the experimental one, respec-tively, at the designed angle of 70°. In this experiment, the axes cooperate well and run stably, but collision is likely to happen between the spinning mouth and the mould, which means the phase of the original points must be strictly con-trolled. (2) Vane winding To verify the practicability of the patch wind-ing method, another experiment is conducted with a vane. Fig.8 and Fig.9 show its simulation and ex-perimental results respectively. The difficulty of the vane winding lies in the tail part of the mould due to its highly irregular shape hard to be described with an equation. The results of the simulation and the experiment have shown the effectiveness of patch winding method in solving the problem. Fig.6 Inlet winding in simulation. Fig.7 Inlet winding in experiment. Fig.8 Vane winding in simulation. Fig.9 Vane winding in experiment. 4 Results and Discussion 4.1 The advantage of patch winding (1) It is evidenced that the method is easy to be put into practice. Because of the mould surface friction modulus, the winding angle can change with different doffing points of the mould surface. The winding angle can be fine tuned according to the mould surface, which provides great flexibility for the line design and pressure loading capacity de-sign. (2) It is easy to design axial and radial inten-sity. The fiber direction changes along with the winding angle. At the same time, the intensity direc-tion is decided by fiber direction. As a result, it is easy to control the intensity of a product by chang-ing winding angle. (3) Following the basic winding theory, this method is based on easily obtainable surface nodes, which makes the design process timesaving and convenient, and, moreover, easy to learn and use. 4.2 The shortage of patch winding It is clear that to acquire discrete points from a mould surface, especially for an abnormal mould proves to be a very burdensome and tedious work. The line type and product quality rely on the point density. Fig.10 shows the trend that gyration error changes with point density and mould size. Fig.10 Gyration error changing trend line. The gyration error turns bigger as these points become more scattered. On the condition that the number of the points is the same, the bigger be-comes the mould radium size, the more influences will the point distribution density bring. Therefore, it is a key problem in the future research to acquire the useful abnormal mould surface coordinate more quickly and accurately. 5 Conclusions Focusing on the characteristics of patch wind-ing, the Slip line condition and the Bridge condition are analyzed in detail and the judgment principles are proposed as well. The feasibility of the patch winding is verified in simulation and winding ex-periments of two airplane typical parts, an inlet and a vane. Besides, this paper provides certain theo-retical evidence for the composite material patch winding of the abnormal shape mould. The analysis performed herein is only a part of an ongoing research program. Improving this theory will be paid much more attention in the further work. References [1] Fu H Y, Huang K B, Zhu F Q, et al. Boundary conditions and stability formulas for the non-geodesic winding. Journal of Harbin Institute of Technology 1996; 28(2): 125-129. [in Chinese] [2] Wang Z J, Li F, Liu J C. Study design for cone structure. FRP/CM 2005(2): 34-37. [in Chinese] [3] Beakou A, Mohamed
A. Influence of variable scattering on the optimum winding angle of cylindrical laminated composites. Composite Structures 2001; 53(3): 287-293. [4] Zhao L Y, Mantell S C, Cohen D, et al. Finite element modeling of the filament winding process. Composite Structures 2001; 52(3): 499-510. [5] Sala G, Cutolo D. Heated chamber winding of the thermoplastic powder-impregnated composites: Part 2. Influence of degree of impregnation on mechanical properties. Composites 1996; 27(5): 393-399. [6] Henninger F, Hoffmann J, Friedrich K. Thermoplastic filament winding with online-imprehnation: Part B. Exprimental study of processing parameters. Composites 2002; 33(12): 1677-1688. [7] Polini W, Sorrentino L. Winding trajectory and winding time in robotized filament winding of asymmetric shape parts. Journal of Composite Material 2005; 39(15): 1391-1411. [8] Wang X F, Fu H Y, Han Z Y. Analysis and realization of patch winding method for complex form. Aerospace Materials and Tech- Technology 2006; 36(6): 39-41.[in Chinese] [9] Han Z Y. Research on CAD/CAM technology for filament wind-ing composites and its application. Dissertation for the Doctor Degree of Harbin Institute of Technology. [in Chinese] [10] Wang X F, Fu H Y, Han Z Y. The validation of the feasibility of abnormal form patch winding. Materials Science Forum 2006; 532-533: 129-132. [11] Xu Z, Wu Y C, Tian H F. Research of fiber placement molding technology. Fibre Reinforced Plastic/Composites 2002; (5): 44-46. [in Chinese] [12] Mark A L, Steve F B, Mark B G, et al. Manufacturing flat and cylindrical laminates and built up structure using automated ther-moplastic tape laying, fiber placement, and filament winding. SAMPE Journal 2003; 39(2):30-38. Biographies: Fu Hongya Born in 1963, as a professor in Harbin Insti-tute of Technology (HIT), he has published many scientific papers in various periodicals. His main research interests are numerical control technology and composite winding tech-nology. E-mail: hongyafu@hit.edu.cn Wang Xianfeng Born in 1980, as a doctor candidate in HIT, he has published 8 papers and applied 3 patents. His main research interests are composite winding technology and winding machine control theory. E-mail: wx2003_999@126.com