Research On Flexible Assembly System Of Engine Complex Pipe Fittings

Special shaped pipe production requires special welding equipment.For each product,a special set of welding equipment is required.In the special equipment welder assembly,first accurately control the key dimension parameters such as the length and angle of the complex pipe fittings,use the pin to limit and fix the flange mounting positions at both ends with the bolt,and the middle parts are positioned and supported by the rigid fixing bracket.After the repair and assembly of the components,the relative positions and directions are fixed,and then the key points are welded.With the rapid development of new types of aerospace equipment and new products,more and more tooling molds are being developed and produced.The cost for the development and production of complex pipe tooling molds is huge.The management and storage of tooling molds has become a problem for enterprises.Obstacles to development urgently require the solution of complex pipeline production technologies that can adapt to the rapid development of new aerospace equipment.In this paper,the technical parameters of the positioning platform are determined according to the type,structure and shape parameters of various complex pipelines,and the platform mechanical structure that meets the production requirements of most complex pipelines is designed,including the actuator(positioning and supporting components);positioning transmission system(X Unit;Y unit;Z unit,2 rotary units);drive system;support system(base).Calculate and analyze the selection of drive system and drive system.The D-H method was used to derive the coordinate transformation matrix from the positioning point of the flexible platform’s top positioning support mechanism to the pose coordinate system of the base.The three-dimensional model of the flexible platform structure is rationally simplified.The ADAMS software is used to simulate the movement of the pipe fitting assembly.From the perspective of kinematics and dynamics,the rationality of the design of the flexible platform structure is verified.The finite element analysis is performed on the mechanical properties of the main components of the structure,and the strength and stiffness of the components are inspected,and the hazardous locations are optimized for design and disposal.The dynamic characteristics of the flexible platform servo system are analyzed,and the dynamic characteristics of the Y axis are analyzed using Simulink simulation methods.Through reasonable parameter settings,fast and accurate position command tracking in the Y direction is achieved,and the anti-interference performance is analyzed at the same time.Provide reference for optimization of system parameters.Based on the LMS system’s key support structure after the flexible positioning platform is installed,the base support,Y-direction movement pair,and Z-direction support vertical column are subjected to modal testing,combining Time MDOF(Time Domain Analysis)and Poly Max Modal Analysis.It is verified that the first three-order frequencies of the flexible positioning support structure under two conditions are obtained,which provides a basis for the flexible platform to avoid the resonant frequency during normal operation.