Path Planning For Blisk Blade Surface Belt Grinding And Spatial Axis Analysis

Thrust-weight ratio is one of the comprehensive performance indexes of aeroengine, the design to improve thrust-weight ratio has become the core task of modernaero engine manufacturing. The aero-engine turbine, compressor, fan design as a wholeblisk structure (Blisk) is an important measure to improve the aero-engine thrust weightratio. As key components of aero engine, the blisk structure eliminates the useof traditional connection tenon, mortise and locking device, so the structure weight isreduced, the number of parts is reduced, and the loss of tenon airflow is avoided. Thewhole structure of the engine is greatly simplified, the weight ratio and reliability isobviously improved. The blisk as the next generation of aircraft engine key componentsto achieve functionality improvement and technology across, its manufacturingtechnology is the key to promote the progress and development of aviation engine.The process of blisk is usually machined by NC milling or electrolytic processingand subsequent polishing finishing combination. Blisk grinding and polishing is mainlyused to remove blisk surface residual marks before of the former procedure, improvingblade surface quality. At present domestic still use manual grinding and polishing torealize the finishing of blisk. Manual polishing processing efficiency is low, grindingallowance uneven. As a result, the blisk surface consistency is influenced by the skilledworkers. In actual work process, technical workers use detecting templatesfor planning polish machining allowance, evaluating polishing quality. However, thedetection is low efficiency and poor generality. The quality and efficiency of the bliskfinishing has seriously restricted the development of aero engines in china. According tothe present situation of aero-engine blisk blade inner and outer arc surface processing,mainly study the blade surface NC polishing tool path planning technology. The maincontents of this paper include the following aspects:Compare the commonly used tool path planning method, such as isoparametric linemethod, the intercept method and scallop height method. Combine with the free-formsurface characteristics of blade. Select isoparametric line method and scallop heightmethod for tool path planning, and on this basis improve it..Applying three-dimensional software function, analyze the blisk blade surfacecurvature characteristics, select a reasonable the tool path mode. The traditional chorderror checking method, determine the step length conservative, prone to false defects. Put forward suggestions to improve the checking method, give the improved chord errorchecking method.3.From the study of the relative position and orientation of the tool and the workpiece in grinding process, fully consider the characteristics of belt grinding, analyzes themachine structural characteristics and each axis movement forms, establish thekinematic model of the machine, using the D-H method to solve each axis of motionparameters. Give consideration to the machine tool processing efficiency andquality of machine tool, research the grinding machine feeding speed.4. Use UG secondary development tools for the blade CAD model, through theblade surface analysis, access the position coordinates of each point on the blade, thenormal vector and the surface curvature information. Finally, the theories and modelingmethods discussed above are applied to a specific case of blisk grinding simulation.Verify the feasibility of trajectory planning.