数字化多轴向三维编织原理样机及其工艺研究

Three-dimensional(3D)braided preforms are the reinforcements of high-performance composites. The level of digitalization of 3D braiding machines decides the forming precision, designability, and traceability of 3D braided preforms. To solve the low-level digitalization of traditional braiding machines, a digital multiaxial horizontal yarn delivery 3D braiding prototype machine was developed. According to the stepping drive method, the hollow shaft hexagonal horn-gears of the prototype machine were designed and implemented, and horizontal yarn carriers with constant tension were designed and manufactured by establishing the space motion model of the yarn. Visual Studio was adopted to design and develop CAE(Computer-Aided Engineering) real-time control program based on Windows 7 64-bit and higher version operating system, and the hardware of the lower computer control circuit of the prototype machine was designed based on the STM32 microcontroller. The trajectory model of the yarn motion was established in the Cartesian coordinate system, and the trajectory of the yarn motion was simulated by the principle of spatial kinematics. Braiding experiments were carried out by using 850D polypropylene fiber for verification. Simulation results were consistent with the braided structure after the experiment, which proves the feasibility of the multilayer fabric structure braided by the prototype machine and the accuracy of the simulation results.