Research On The Key Technology Of T-section Therr-dimensional Braiding And Design The Braiding Equipeng

The prefabricated parts of the three-dimensional braided composite have a unitary structure which are braided by high-performance fibers using a three-dimensional braiding process.Since the traditional three-dimensional braiding process adopts the stepping motion mode,the production efficiency of the prefabricated parts is low and the three-dimensional braiding equipment is expensive.The prefabricated parts can only be produced in small scale and cannot be manufactured in large quantities,limiting the wide application of the three-dimensional braided composite materials.This paper takes the three-dimensional braid with T-section as the research object,and studies its threedimensional braiding process.Based on the rotary three-dimensional braiding principle,a three-dimensional braiding process which adopts the continuous motion mode is proposed,braiding process is simulated dynamically,model of the braid structure is established,A three-dimensional braiding equipment is assembled,verify the correctness of the braiding process and fabric model by braiding experiments.The main research contents of this paper are as follows:(1)Based on Cartesian three-dimensional braiding principle,rotating threedimensional braiding principle and hexagonal three-dimensional braiding principle,this paper design four braiding processes for three-dimensional braid with T-section and research on four braiding processes.Further research on the rotating three-dimensional braiding processes for three-dimensional braid with T-section and select the principle of rotary three-dimensional weaving.Study the continuous motion mode of the carriers,the moving track of the carriers and the "10" arrangement of the carriers and give the arrangement of horn gear and the braid structure enhancement scheme.(2)This paper constructs a mathematical model of the arrangement of horn gear in the T-section three-dimensional rotary braiding process.According to the mathematical model constructed,the spatial coordinates of the yarn are obtained,and build threedimensional for braiding structures by using cubic B-spline curve that adopts the points to approach the bending status of the yarn,and the model is optimized to make it closer to the real braid structure.According to the mathematical model constructed,the yarn model and the spindle model are also established.Dynamic simulation of motion of the carriers,yarn interlacing motion and braid traction motion in the braiding process are then performed.(3)Study the structure and transmission system of the rotary braiding equipment and propose the overall design scheme of the three-dimensional braiding equipment.In order to improve the performance of the braid structure and reduce the cost of the braiding equipment,the arrangement of horn gear in the T-section three-dimensional rotary braiding process is optimized.According to the optimized arrangement of horn gear,the structure and transmission system of the three-dimensional braiding equipment are designed.(4)A three-dimensional braiding equipment is developed,and braiding experiments were carried out on the equipment to verify the feasibility of the three-dimensional braiding process proposed in this paper and the correctness of the dynamic simulation of the braiding process.