The Design And Performance Analysis Of Mobile Drilling System

Drilling is a key link in the process of aircraft assembly,the quality of the hole affects the service life and performance of the aircraft body directly.With the rapid development of modern aviation industry,higher requirements and expectations for the quality and performance of modern aircraft are put forward.Automatic assembly technology is now the main development trend;it can meet the various requirements of the aircraft manufacturing industry,and improve production efficiency.Therefore,this paper focus on the automatic drilling,deal with the design and analysis of the movable drilling system,and provide a theoretical reference for the design of automatic hole tooling.Firstly,this paper has designed a movable drilling system specifically for large hard moving aircraft parts,which can be suitable for the little change in curvature of the workpiece’s surface.The drilling system is composed of three parts: a drilling unit,the attitude adjusting platform mechanism and a bottom moving mechanism,the attitude adjusting platform mechanism has adopted an asymmetric parallel mechanism with symmetrical layout and asymmetric structure.In the process of drilling,the movable drilling system can complete a series of hole making process in the processing area,such as positioning,adjusting position,pressing,drilling and returning.Computer aided design technology is used in the part design,that is using CATIA software to design parts,and virtual assembly technology to complete the geometry of virtual prototype.Theoretically,this article is on the perspective of the degree of freedom,analyzing the attitude platform by screw theory,and verifying the correctness of its structural design.Secondly,use ADAMS software to analyze the dynamic performance of the mobile system.The virtual geometry model created in CATIA is imported into ADAMS to add material,constraint and drive,generate functional virtual prototype to meet the requirements of simulation experiment.This paper is based on the virtual environment,simulate the virtual prototype of the drilling system,and analysis the results,in order to verify the correctness of the mechanism design,function design and parameter design of the mobile drilling system,and obtain the motion performance of the mechanism.Lastly,use Workbench to analyze the statics of mobile drilling system.Through the analysis of the stress nephogram,deformation nephogram and relevant data,checking the strength and optimizing the layout of the system.At the same time,the static stiffness of the different position of the drilling unit,the bearing capacity of platform X,Y,Z three directions and the static stiffness of X,Y and Z in the bottom bearing mechanism under different loads is analyzed.The main content of this paper is focused on four aspects: the structural design and analysis of the movable drilling,the screw theory of freedom analysis,the dynamic analysis and the finite element statics analysis,the designed hole making system can meet all the requirements of drilling,and has certain research significance and use value.