The Technique Research Of Shaping Internal Helical Gear By EDM

The thesis aimed at the characteristic of the quenched internal helical gear, especially with few number of tooth, big module and high pressure angle hard to hard to manufacture either by cutting or by grinding, the auther carried through a research about the machining of the quenched internal helical gear, adopting a method of shaping internal helical mold gear by EDM. The equipment for shaping internal helical gear by EDM is developed based on the HCD250 accurate shaping EDM machine tool, and the theoretic and experimental research is carried out.Aiming at the EDM characteristic and the parameter of the workpiece gear ,the finishing analysis and parameter design of tool gear are finished, and a compensating method of tool electrode is put forward. Aiming at the non-standard gear involved in complicated calculation, a computer aided parameterization design calculation and simulation are carried out. Using the second exploitation software block :ObjectARX2000 of the Autodesk Company ,the advanced program blocks based on AutoCAD2000 are developed for drawing theoretic gear form ,the simulation of gear generation and the gear profile plotting according to the measuring data from the 3-dimmension measuring engine.The theoretic analysis is finished about the machining error of craft, and the theoretic model about error of craft is established. The source and influence of the helical mechanism error are discussed, and the solution for diminishing the error is also proposed. 'According the characteristic of involute gear form ,the theoretic analysis about the relation beteen the intensity of electic field and curvature along involute gear form is studied through mathematic induction and numeric simulation. The relation beteen discharge gap and tool electrode curvature is analyzed through experiment. The new measuring method of gear accuracy is proposed. The data processing and precision analyse for internal helical gear are finished through the calculation programme of MATLAB language according to figure data from 3-dimmension engine.The research in this paper about the machining of the quenched internal helical gear provides a new idea for the machiming of quenched internal gear,gear with peculiar form and so on,so it is significanct.