Five Axis Machining Mechnology Research Of Non-developable Ruled Surface Integral Impeller

Non-developable ruled surface integral impeller as the typical artifacts in whole impeller, it is widely used in aerospace and automotive engine inside turbocharged components, because of its complex shape of blade, narrow space of runner, the traditional three-axis CNC machine tools can’t achieve machining of its shaped surface,while the problem of precision that is caused by blade deformation in multi-axis machining also restricts the performance and service life of the product. In order to achieve high efficiency, high quality objective of non-developable ruled surface integral impeller, in this paper, the problem of processing inefficiencies and machining accuracy which exists CNC machining with the use of five-axis machines.Cutting heat and residual stress are the main factors leading to not high quality of overall impeller surface. This paper through establish the overall impeller milling model in ABAQUS, make the dynamic simulation analysis, set different processing parameters control, then the influence law of cutting heat and the surface residual stress that are produced when the milling speed, radial cutting depth and each tooth feeding on overall impeller, the optimize of process parameters of the integral impeller is achieved; in order to improve the precision of overall impeller blades, this paper divide the blade and other parameters into a number of milling unit, milling force is loaded to the corresponding milling unit, the overall deformation law of blade is analysised, and based on the amount of elastic deformation that correspond with the blade unit, the blade flank milling modification compensation algorithm for machining error is proposed, under the premise of generating blade flank milling without interferencecutter shaft vector, using B-spline interpolation method, finally the target machining surface is obtained by fitting method.To verify the effectiveness of blade side milling compensation algorithm, this paper obtain corresponding cutter location file by CNC machining for leaf blade surface and fitting target machining surface in UG-CAM module, and build the virtual simulation machining system of DMU210 FD based on VERICUT, making machining simulation of overall impeller model, further make a comparative analysis for compensation cutter location file and uncompensated cutter location files on the impact of integral impeller model had and less cut data, and the NC program is loaded into the machine of DMU210 FD for actual machining verification.The simulation machining and actual machining verification show that: the integral impeller process parameters that is optimized and the NC program that is generated by loading the blade side milling compensation algorithms post-processing, the machining error that is caused by side milling integral impeller blades is reduced, and surface machining quality of overall impeller is improved, the purposes of improving machining precision and quality is achieved, it has a certain guide significance for the actual processing of non-developable ruled surface integral impeller.