Design Of Docking And High Speed Drilling Machine For Carbon Fiber Reinforced Plastics Cylindrical Component And Low-pressure Chamber

Because of its excellent mechanical properties, Carbon Fiber Reinforced Plastics (CFRP) has been widely used in the sphere of aerospace and transportation. Especially in the sphere of Aeronautics and Space, the strict requirements on specific strength and specific stiffness for the critical components greatly promote the utilization of CFRP.As a typical large diameter and thin wall component, the CFRP cylindrical component needs to be docked and co-drilled with the low-pressure chamber. However, the traditional docking and the drilling method’s low efficiency and bad precision render it outdated. A machine, which can automatically realize high precision and convenient docking and drilling, is in pressing need.After the introduction of the research background, a thorough review of the development of the machining of CFRP both in domestic and abroad was carried out to present the aim of the research in this paper. The main research in this paper is presented as follows:Firstly, the design scheme of the machine was presented according to related requirements with the functional analysis design method. Based on the analysis of the docking and drilling processes of the CFRP cylindrical component and the low-pressure chamber, the machine should have three subsystems, docking subsystem, drilling subsystem and supporting subsystem. To improve drilling process’s centripetal precision, the arched girder was employed to support the to-be-drilled components.Based on the design scheme, general design of the machine was finished based on the platform of Pro/Engineer. Moreover, each component’s detailed design and3D model for the three subsystems was accomplished using the top-down design approach.Finally, the key components of the machine were investigated by Finite Element Analysis using ANSYS/Workbench to guarantee the reliability of the design. The dimensions of the arched girder and the support column were modified according to the results from Finite Element Analysis. Moreover, the drilling component was optimized using parameterized optimization method, through which the natural frequencies of the arched girder and support were increased without any mass addition. Eventually, the design of a machine was presented. This machine can realize high precision docking and high speed drilling between the CFRP cylindrical component and the low-pressure chamber.