Design And Research On Automatic Polishing Mechanical System Of Wing Skin Surface

Wings are one of the important components of an aircraft.The surface quality of the wing has an important impact on the flight of the aircraft,which is directly related to the aircraft’s service life and various aspects of mechanical properties.Grinding,as a finishing process in mechanical processing,plays an important role in the production and processing of wing skins.At present,the wing skin surface is usually polished by hand in the aircraft manufacturing industry in China.Manual grinding is not only difficult to ensure the consistency of the wing skin surface,which makes the material removal uneven,and the rate of waste products is high.Production efficiency is relatively low.In addition,workers who have been engaged in grinding operations for a long time will inhale a large amount of dust and endanger their health.Based on the many disadvantages of the traditional manual sanding of the wing skin surface,the paper designs a mechanical system for automatic grinding of the wing skin surface to replace the traditional manual grinding operation and improve the grinding of the wing skin surface Cutting quality and production efficiency.The main research contents of the paper are as follows:1.According to the existing manual grinding method,the automatic grinding process of the robot is analyzed,and the overall design scheme and system composition of the automatic grinding mechanical system for the wing skin surface are initially determined.By establishing a model of the material removal rate of the wing skin surface,the need for constant force control of the contact force between the grinding tool and the wing skin surface during the automatic grinding operation of the robot was summarized.2.Structural design of the constant force device.By analyzing the working requirements to be achieved by the constant force device,the design scheme is determined,and the components,functions and working methods of each part are detailed.3.According to the characteristics of the wing skin,a flexible fixture is designed to fit the shape of the thin-walled parts of the wing skin in a discrete lattice manner to achieve contoured clamping.Determine the transmission scheme of the positioning / support unit in the flexible fixture system in the three directions of X,Y,and Z respectively,and carry out the specific structural design of the flexible fixture.4.Using ANSYS finite element software to perform static and modal simulation analysis of the positioning / support unit in the flexible fixture system,and verify the strength and stability requirements of the structure.5.Based on the multi-point positioning theory of thin-walled parts with curved surfaces in NURBS space,the method of solving the positioning / supporting point coordinates of thin-walled wing skin parts is introduced.Using ANSYS finite element software to simulate and analyze the deformation of the thin-walled skin of the wing under different uniform positioning / support methods,and combined with the genetic algorithm to optimize the layout of the positioning of the flexible fixture positioning / support units,reducing the grinding process Deformation of thin-walled skin parts of the wing improves the grinding quality of the wing surface.