Design And Simulation Of Loom Shedding Mechanism For Weaving Carbon Fiber

Carbon fiber material is widely used in various fields because of its excellent performance in all aspects.However,the weaving process of carbon fiber is more difficult,mainly because carbon fiber is prone to fuzzing,breakage and other problems in the weaving process,which greatly reduces the weaving efficiency and increases the production cost.In this paper,the shedding mechanism of carbon fiber weaving equipment is studied.(1)On the basis of understanding the development status of loom shedding mechanism at home and abroad,a new groove cam shedding mechanism for weaving carbon fiber is designed by using mechanical design theory,and then a heald frame supporting bar is designed by using truss principle.Finally,the three-dimensional model of the opening mechanism is built in Solidworks,and the motion simulation analysis of the groove cam opening mechanism is carried out,and the motion law of the heald frame is verified to meet the quintic polynomial motion law;(2)Copper plating in heald eye is proposed to reduce the wear between heald eye and carbon fiber tow.The micro wear simulation model of heddle eye and carbon fiber is established in ABAQUS,and the tensile test of carbon fiber tow is carried out.The correctness of the micro wear model is verified by comparing the test results with the simulation results of the micro model.Based on the progressive damage mechanism,the initial damage of the micro model of the heald eye and the carbon fiber tow is analyzed.The damage of the carbon fiber tow is compared and analyzed by changing the non-ferrous metal material plated in the heald eye.The simulation results show that the damage of the carbon fiber tow caused by copper plating in the heald eye is the least;(3)Based on the analysis of the wear between carbon fiber bundles in the process of opening,it is proposed to reduce the wear of carbon fiber bundles by copper plating on the surface of carbon fiber monofilament.The micro model of copper plated carbon fiber bundles is established in ABAQUS.The Archard adhesive wear model is used to simulate the wear of carbon fiber bundles,and the optimal thickness of copper plating layer is calculated.The simulation results show that the wear resistance of carbon fiber copper plating layer is 1micron.At the same time,it also provides a theoretical basis for coating a layer of copper coated carbon fiber on the surface of the cam to reduce wear;(4)In the aspect of the cam design in the opening mechanism,this paper proposes to plating a layer of carbon fiber with copper as 1 micron on the inner groove surface of the groove cam contacting with the roller to improve its wear resistance,so as to improve the motion stability of the heald frame and reduce the fuzzing and breakage of the carbon fiber.Based on the Archard adhesive wear mechanism,the wear of the simplified cam roller model is analyzed in ABAQUS,and the wear of the cam roller model is calculated by ale mesh and umeshmotion subroutine.The wear between the pure metal cam roller and the cam roller with a layer of copper carbon fiber is compared.The simulation results show that the cam roller with a layer of copper carbon fiber has the same wear as the cam roller with a layer of copper carbon fiber The results show that the wear between the rollers decreases and the heald frame moves stably.