Research On Core-Parts Processing Error Analysis And Virtual Measurement Of Toroidal Drive

The toroidal drive combines rolling contact technology and planet-worm drivetechnology, which has the advantages of compact structure, large transmission ratio, hightransmission efficiency, strong carrying capacity, etc., also was widely used in aerospace,national defense equipment, wind power generation, and other advanced new technologyareas, and has important strategic significance. The core-blocks of the drive are the toroidalstator and sun-worm of which both working profiles are complex spatial surfaces.Undoubtedly its precision directly determines the transmission accuracy, reliability andservice life of the mechanism. Since the toroidal core component profile is one of typicalcomplex curved surfaces, The influences of programming errors, machine errors, tool wearerrors on the core-block profile in the actual processing lack systematic analysis.Therefore, ithas been an important technology bottleneck to improve manufacture precision effectively ofthe toroidal drive core-block. In order to prediction and control the core-block of theprocessing error scientific effectivily, considered core-block of the toroidal drive processingerrors and virtual measurements as study object. Space conjugate surface meshing theory,multi-body system errors theory, CNC programming technology, virtual the measuringprinciple and Matlab simulation software, VC++language and UG/Open Grip theory andtools were adopted expose programming errors, the combined effect profile surfacemachining error of the core-block of the specific research machine error, tool wear error andoriginal errors systemic. Special studies are as follows:1) The analysis of the processing error, the application of multi-body system theory inthe analysis of machining error was summed up.3D models of the core-block of the toroidaldrive was established, which laid theoretical foundation for follow-up study.2) Established the spatial geometric error model has been focused on the movementrelationship between each axis of five-axis CNC machine tool and inferring machine motiondiagram and low-order body arrays table. Derived profile equation with the toroidal stator andthe sun-worm with machine error by using single-side method and generating method. Giventhe definition and calculation method of the normal error the of core-block of the toroidaldrive, and infer the core-block profile normal of formula.3) Compiled the multi-axis CNC machining error analysis program of the profile oftoridal stator and sun-worm by using Matlab software based on the core containing theoriginal error derived from the2) parts contour surface equation. Explored the influence of theoriginal errors on the profile of the core-block law, the results of single-side method and generating method have been compared.4) Exploited the core-block of torsional drive computer-aided manufacturing andcomputer-aided measurement CAM/CAT integrated system by using UG based on the virtualmeasuring principle. Used the three offset algorithm method to extract the torsional stator andthe sun-worm of the cutter file, realized simulation manufacturing and virtual measurement inthe integrated system, comparative analysis the degree of the measuring agreement with thetheoretical value and verify exploiting the system is effective and reliable.In conclusion, the studies laid a theoretical foundation for the realization of thecore-block of processing error of scientific prediction and control, the tutorial drive accuracyimprove effectively.