Research On The Generation Of Welding Repair Path Of Aero-engine Blade

In recent years, China civil aviation industry has developed rapidly in recent years, civil aircraft, cargo plane quantity rises year by year, aircraft servicing and aircraft maintenance and other tasks increase greatly, so no doubt China must continuously improve the level of aircraft maintenance technology. In the aircraft Repair technology, the most important and most difficult technology should be the repair of aero engine. Aircraft engine is known as the “heart of aircraft”, while aero-engine blade is called with “the heart of engine”. In China, the maintenance of civil aviation engine blade mostly belongs to the manual repair, the degree of automation is very low, a large number of damaged leaves which need complex maintenance process must be sent abroad to repair, which has been unable to meet the Requirement of aero engine blade welding repair efficiency and automation level from China’s increasingly tense of civil aviation transportation The development of equipment of welding repair of aero engine blade brooks no delay. The research on the welding path planning is very important in the repair equipment of aero engine blade.Only through a detailed analysis of aero engine blade working environment, the main parameters, the main failure form, the scope of repair welding and so on, path planning of welding repair is of practical value to the sixth stage blade of aero engine. Through the research on the issues including that how to synthesiz the point cloud from the reverse engineering to surface model by the domestic and foreign scholars, and how to extendand surface according to the known surface, using the NURBS surface to express the surface model for repairing blade.According to the study of a large number of slicing technology in rapid prototyping technology by the domestic and foreign scholars, by comparing the slicing technique based on STL model with directly CAD model slicing technology, by analyzing the scope of application of two methods respectively, finally the slicing method of the most suitable for the sixth stage blade of aero-engine compressor can be made. Finally, the repair path of aero engine compressor blade is obtained by equal arc length division, point coordinates calculation, three times spline interpolation calculation on the edge curve after stratification.After surface fitting, surface extension, layering the three-dimensional model, extraction of contour curve layered, segmentation curve, centerline extraction, the repairing path of sixth stage blade of aero-engine compressor is generated eventually. Using Imageware software to build and layer the three-dimensional model of the repairing part of aero engine blade, using Matlab software to extract the centerline of edge curve after stratification, that is the welding path planning, finally the task is completed. The simulation experiment proves that the welding path curve error constructed does not exceed 0.02 mm, meets the accuracy requirements of welding path fully.The welding repair of blade of air engine is a complex multidisciplinary problems, only analyzing the blade welding path from the machining direction, according to the experimental results, given the welding process parameters including the welding wire feeding speed, current and voltage size, by using the above method can quickly product the high accuracy welding repair path of aero engine blade.