Research On Simulation System Of Manufacture For Spiral Surface Products Within NX CAM/VERICUT Double Environment

Spiral surface is one of the widely used complex surfaces in modern engineering,including mechanical manufacturing, aerospace field and national defense industry.And high precision machining of spiral surface products has became one of importantsymbols to assesses manufacturing level of one country. But the sufficient applicationof spiral surface products are restricted in a certain extent with the enormousdifficulty, low efficiency and high defective percentage of machining. With buildingthe platform of machining simulation, this paper studies the NC machining simulationof spiral surface products in theoretical methods and key techniques. All above inorder to reasonable planning of cutter track, effectively avoid situation of excess andgouge machining, avoid interference and collision between cutters and workpiece,simulate machining process of products, reduce the detection time of NC codes. Andto achieve the goals that reducing production cycle and machining cost and highquality&high efficiency machining for spiral surface products.According to different classification criteria of spiral surface, this papersummarizes the classification of it and puts forward the mathematical expression ofspiral surface with characteristics of generatrix building motion based on the theoryof differential geometry and matrix method. Plan to research on machining method ofa special category of curved spiral-surface, arc-shaped section line of spiral surface,with using the theory of plane analytic geometry. A searching method of driving ruledsurface has been put forward. And this method suits for the planning of cutter track ofspiral groove with feature that smaller groove width and just need one single layer ofdriving ruled surface.Plan to research on machining method of non-arc-shaped section line of spiralgroove with a modified method of generating equidistant ruled surface based on theparticular case and accumulation. A searching method of driving ruled surface hasbeen put forward and the conditions of spiral surface of fitting this method have beenput forward too. This searching method could be used in planning of cutter track ofspiral groove with features that large groove width and needing more than one layer of driving ruled surface.In order to verify the operational feasibility and correctness of the searchingmethod of driving ruled surface, a digital machining simulation system has been builtwithin NX CAM and VERICUT double environment. In NX CAM takes workpieceof arc-shaped section line of spiral surface as machining object and uses spiralscanning method to digital model it. According to the planning of NC machiningprocess of workpiece and the searching method of driving ruled surface used forcurved spiral-surface, to plan the cutter track of workpiece. And according toparameters&characteristic of VMC850E NC machine tool and research on generalmodeling method in virtual machine tool, in VERICUT, it has been done that toestablish a virtual machine tool for machining simulation. This system could provideactive and convenient solution for the planning/testing of cutter track andgenerating/testing/optimizing machining code. And this system applies to those spiralsurface products could be machined in four-axis linkage machine tools.Plan to carry out experiment of four-axis NC milling machining usingVMC850E machine tool. Test the characteristic parameters of spiral groove aftermachining it, then contrast with the results come from virtual testing. In this way toverify the rationality of NC machining process and correctness of NC code both inmachining simulation system, and further to prove the rationality and correctness oftheory and technology of research in this paper.