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Tool Path Planning And Simulation In Five-axis NC Machining Of Integral Impeller

Posted on:2013-10-14Degree:MasterType:Thesis
Country:ChinaCandidate:Q Y CengFull Text:PDF
GTID:2231330362971003Subject:Mechanical engineering
Abstract/Summary:PDF Full Text Request
Integral impeller is a key part widely used in many fields, such as energy power, aerospace andpetrochemical industry. It is a typical part usually with thin and twisted blade which is difficult tomachine. In this paper, the process of intergral impeller rough and finish machining is determinedaccording to the geometric features of impeller, the tool path of five NC machining of integralimpeller is planned and the feasibility of the tool path is verified through simulation. The maincontent of this paper are as follows:The machining process of impeller is determined. Based on the geometric characteristics ofimpeller, a machining process route of impeller is proposed, which includes the division of processingstages, the design of special fixture, the selection of proper machine tool, blank, cutter, cuttingparameters and so on.The tool path generation algorithm of rough machining for impeller is researched. First thechannel is divided into five unit machining regions and the boundary of each region is determined,then the different diameter cutters are used to machining the channel. Offset-hub layered strategy isadopted, the calculation methods of cutting step, path interval and cutter location of the roughmachining are presented, and the tool path is planned according to the zig-zag cutting strategy.The tool path generation algorithm of finish machining for impeller is studied. As to blade finishmachining, the way of determining cutter location of blank flank milling is given, the over-cut error isanalyzed and controlled by rotating initial tool axis vector. As to hub finish machining, first the hubsurface is divided into two areas by obtaining dividing line, the calculation methods of cutting step,and cutter location of each area are given.Using the tool-path generation algorithm of impeller presented in this paper, cutter locationsource files are obtained by programming in Visual C++6.0environment based on UG/Open APIinterface functions. UG/Post Builder is used to create the special post processing file and then thecutter location source files are transformed into NC code. The simulation of machining process ofintergal impeller is accomplished in VERICUT system, and the result shows the tool path whichpresented in this paper is feasible.
Keywords/Search Tags:Integral impeller, Five NC machining, Tool-path planning, Post-processing, Simulation
PDF Full Text Request
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