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The Study On WEDG Craft Based On The Wire Electrode Cutting Machine

Posted on:2005-10-15Degree:MasterType:Thesis
Country:ChinaCandidate:H Q FengFull Text:PDF
GTID:2121360122999907Subject:Mechanical Manufacturing and Automation
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With the development of micro mechanical technology, the process technology of micro-axial is playing an important role in micro machine producing. Because of the cutting force, routine machine finishing is very difficult to manufacture micro-axial of diameter range from 10 to 100 u m ,especially the axial with large length-diameter ratio. Without the macro cutting force, Electro-discharge machining is fit to manufacture micro-axial and shaped-axial.The article analysis world widely research about WEDG. The conclusion: the experimental equipment of manufacture micro-axial by WEDG is special discharge grinding apparatus triturated by laboratory itself. Not only the equipment cost is higher, but the field of application is narrow. To analysis the working element of WEDG, we believe, wire electrode cutting machine may get the function of WEDG by adding the auxiliary device. Then by study the craft of WEDG, we may get a kind of WEDG craft based on the wire electric cutting machine. So the craft of WEDG is easy to accomplish and be used popularly. 1. The study and disease on mass and roughness of surfacethe article analysis the affecting factors to the mass and roughness of surface in WEDG machining. The mass consists of the roughness of surface, the envenomation and mechanical character. In common, the surface roughness of WEDG is indicated by Ra and Rmax . The largest affecting factor to surface roughness is simple pulse energy, for the larger the simple pulse energy, the larger the erosion, the worse the roughness of surface. By adjust the accuracy of the machinery, choice the treatment fluid and analysis the power, we get some ways to deceasethe roughness of surface.2. Manufacture the auxiliary device of wire electrode machineAbout wire electrode cutting machine: the essential different between WEDM and WEDG is chief axial system. First the article get the function of WEDG in wire electrode machine by manufacture the chief axial system; Second the current of wire electrode machine dose not meet the challenge of micro-machining. We get different current by series resistance and decease the simple pulse energy, then decease the roughness of surface; the tremble of wire electrode influence the roughness of surface greatly. We decease the tremble of wire electrode by shortening the length of wire electrode and adding the limit apparent of wire electrode. The apparent lays in X-axial bridging beam in wire electrode machine. 3.The study and experiment of processing parameterBase on remodeling the apparent, the article study the manufacture the micro-axial by WEDG, the rational choice of electric spark forming processing parameter influences the roughness of surface greatly. To study difference parameters causing difference roughness of surface, through orthogonal optimum design the experiment get natural factor level and code pattern, then design testing program, produce the specimens test coupon. By using HL-II flying-spot microscope, the experiments get boundary data of coupons, Using orthogonal design method analysis the experiment data, get optimum regression equation, then get optimum processing parameter. In electric spark forming multiple cutting may get higher roughness of surface, so the experiment cut several times using optimum processing parameter and get =80 m micro-axial and = 100 m micro-cutting, the roughness of axialsurface is Ra<0. 3 m.
Keywords/Search Tags:wire electric discharging grinding(WEDG), wire electrode cutting machine, micro-axial, roughness of surface
PDF Full Text Request
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