Off-line Programming And Simulation System Of Automatic Drilling Machine

In the assembly process of modern aircrafts the quantity manufacturing of connection holes is very critical,while the assembly quality and the production cycle of the complete set of a plane are determined directly by the quality of the hole processing and drilling efficiency.The trend that the application of automatic hole processing equipments replaces the traditional manual hole processing is for sure inevitable to meet the high efficiency and quality requirements of aircraft manufacturing.In quantity production of modern aircrafts,the automation techniques for hole drilling become even an important guarantee to satisfy the requirements for high precision hole-making.This paper proposed a set of custom-made off-line programming/simulation system,which is derived basically from the functional characteristics of the five axis automatic equipment for hole-processing in the flexible assembly operation of the whole wing frame of a plane.On the platform of CATIA V5 and exploitation of the existing CAD/CAM technical achievements,this paper proposed an off-line programming/simulation system,which is developed,to establish a virtual operational vision in mapping of the related actual assembly site and realize the integrated management of those digital models such as tooling,equipment,workpiece,accessories,etc.Through a further development of CATIA V5,a set of human-computer interaction is custom-made,and the related algorithm processing program is developed accordingly to realize the off-line programming for automatic hole-making including the simulation function for the hole processing.This paper firstly performed an analysis on the motions of mechanical structure of the automatic hole-making equipment,secondly created its kinematic structure,and finally calculated both positive kinematics and inverse kinematics solution,which provides a theoretical foundation for the subsequent research work.In addition,the proposed system divided the off-line programming and simulation into two different models according to the related functions,which makes the system structure more clear;and also,the simple and intuitive interface design results in moreconvenient and smooth operation.The key techniques in the proposed off-line programming model include the area planning for hole processing,the positioning error compensation or correction,etc.,while the perfection of theses techniques may ensure the actual value of the system.The system simulation module may intuitively reflect the positioning accuracy and safety of cutting tools during the hole processing through such functions as implementation of data path,the data path of tools and NC program data files,the movement of the total 3D simulation,the tool path tracking as well as detection methods for collision or interference.The design concept for the proposed system focuses on ensuring the hole processing quality and improving the production efficiency,as result,the execution of above mentioned R&D practically solved not only the problem of low efficiency,but also the problem of poor assembly accuracy in the operation of existing aircraft assembly.