Analysis Of Improving Design In Circular Track Drilling System Of A Certain Aircraft

In order to meet the requirements of high-life,high-efficiency,and high-quality assembly of contemporary aircraft,automated hole-making technology has been greatly developed in the field of aircraft assembly.In foreign countries,automatic drilling and riveting machines,robotic automatic hole-making systems,and flexible track automatic hole-making systems have been widely used in practical projects and have begun to show benefits.This thesis takes the ring-shaped orbital drilling system of a large aircraft fuselage docking area jointly developed by Xifei Company and Zhejiang University as the research object,and improves the design and analysis of a series of problems caused by visual measurement errors in the drilling system.The main research contents of the paper are as follows:First,the research background and significance of the thesis are introduced.The domestic and international development status of automatic hole making technology in digital assembly of aircraft is summarized.The visual positioning technology in automatic hole making technology is expounded.Secondly,the structure composition and function of each component of the ring-shaped hole-making system are explained in detail,the control system hardware of the ring-shaped hole-making system is decomposed in detail,and the working process of the hole-making system is explained.The problem of inaccurate camera calibration position caused by the inconsistency between the vision camera and the main axis of rotation of the main axis is brought forward.An improved design is proposed.The detailed analysis of the vision positioning improvement scheme is introduced,and the embedded camera scheme is introduced to ensure that the visual field of vision sensor is consistent with the center of the main axis.For camera calibration,the pinhole camera model and the lens distortion model are analyzed,and the camera calibration based on Zhang Zhengyou’s calibration method is selected,and the camera calibration test is performed.The hand-eye transformation matrix is established to solve and the hand-eye transformation matrix is optimized.The hole position error calculation is performed based on the interpolation Coos error surface method,and the hole position error is compensated to the theoretical coordinates of the hole to be processed to achieve the hole position correction.Then,it summarizes the normal vector correction process of the ring rail hole making system,establishes the relationship between the world coordinate system,the tool coordinate system,the laser displacement sensor coordinate system,and the camera coordinate system.The normal vector calculation method calculates the normal vector on the surface of the aircraft siding and completes the normal vector correction of the cutter.The test results show the reliability of the improved method.Finally,a hole-making test is performed on the improved ring-shaped orbital hole-making system.The experimental results show that the improved ring-shaped orbital hole-making system can meet the pore diameter accuracy of+/-0.05mm,+/-0.05mm nest depth accuracy and+/-0.5mm row line spacing position accuracy meet requirements.