CNC MILLING OF IMPELLER BLADE BY MACRO PROGRAMMING
Keywords:Impeller blade, MACRO Programming, Tangent Arc method, Bezier Spline
During machining of the curved profile, the tool path is converted into linear segments conventionally. It results in deviation of the tool path from the actual curved profile to be machined. MACRO programming technique for the parametric interpolation has been widely used due to its simplicity. Various programming methods, including conventional linear and circular interpolation as well as MACRO programming are studied in the present work. The geometry of impeller blade is studied as a curved tool path. Point cloud for the blade profile is scanned with needle scanner. These points are fitted to cut the blade with linear interpolation and obtained from series of arc of different radius. An inner surface and outer surface of blade profile are machined with Explicit, Implicit and Bezier spline function. In another approach, blade profile is segmented into three circular arcs to develop algorithms for MACRO programming.
Al-Zubaidy S (1996), “A rapid inverse approach for the design of centrifugal impellers”, Inverse Problems in Engineering, Vol. 3/1-3, 79-91.
Cai Y and Xi G (2003), “Efficient tool path planning for five-axis surface machining with a drum-taper cutter”, International Journal of Production Research, Vol. 41/ 15, 3631-3644.
Zheng G and Zhu L (2012), “Cutter size optimisation and interference-free tool path generation for five-axis flank milling of centrifugal impellers”, International Journal of Production Research, Vol. 50/23, 6667-6678.
Benini E (2003), “Optimal Navier–Stokes, Design of Compressor Impellers Using Evolutionary Computation”, International Journal of Computational Fluid Dynamics, Vol.17/5,357-369.
Li C and Bedi S (2008), “Accuracy improvement method for flank milling surface design”, International Journal of Advanced Manufacturing Technology, Vol. 38, 218–228.
Sugimura K and Obayashi S (2010), “Multi-objective optimization and design rule mining for an aerodynamically efficient and stable centrifugal impeller with a vane diffuser”, Engineering Optimization, Vol. 42/3, 271-293.
Young H and Chuang L (2004), “A five-axis rough machining approach for a centrifugal impeller”, International Journal of Advanced Manufacturing Technology, Vol. 23, 233–239.
Chu C and Chen J (2006), “Tool path planning for five-axis flank milling with developable surface approximation”, International Journal of Advanced Manufacturing Technology, Vol. 29, 707–713.
Senthilkumar and Gopalakrishnan (2014), “Application of grey relational analysis for multicriteria optimization of cutting parameters in turning aisi 4340 steel”, Journal of Manufacturing Engineering, Vol. 9/1, 030-035.
Parameshwari Dhaya Prasad S (2014), “Prediction of process parameters in cnc end milling of UNS c34000 medium leaded brass”, Journal of Manufacturing Engineering, Vol. 9/1, 036-044.
Hadiya J “Fluid power engineering”, 4th edtion, Book India publication, 328.