| "High-end CNC machine tools and basic manufacturing equipment" is one of the 16 major projects fromNational long-term Scientific and Technological Development Plan(2006 to 2020),and the equipment of manufacturing industry.However,due to the integrated non-linear effects of multiple factors,such as the structure,assembly,designing and so forth,in the process,there are a variety of errors produced on the machine which conversely causes some side effects on the quality of workpieces.Therefore,in the machine design process,the static and error are required to do some research.The relevant theory and technology are employed to effectively reduce or avoid the negative factors that may put adverse effects on the performance of machines.Coupling with more stringent requirements for the machine tool resulted from the new industry development,the international research strength is on the way to converge and integrate with the increasingly heated subject.That the mistakes existence parparts assembly or designing effect the overall accuracy of machine tool,and it's also a central issue and the difficulties for the research of geometric error correction technique described above within the category.In recent years,the research of error distribution methodhas become an important basis and necessary branch for the research of machine.For modern CNC machine tool and the future machine,at the same time,the result of error compensation will be the key index which canevaluate its performance,quality of productsand processing products.Based on the above contents,regarding the TX1600G Boring-milling machining center as the research object,some key technology and theories during the research course of its error modeling,compensation,structural optimization and analysis:(1)Researching on error modeling for boring system of TX1600G boring-milling machining center:Based on the boring systemof TX1600G boring-milling machining center,combining the movement principle of this system and the theory of multi-body system,the topology and matrix of low-order bodies were established,and accordingly the model of volumetric errors for the boring system is obtained;in the modeling process,the vertical factorwas introduced into the movement matrix of adjacent bodies for the first time,which improves the accuracy ofvolumetric error characterization and made the relationship equation of theore-tical errors between workpieces and tools closer to the reality,furthermore,errors of error matrix were verified and this method was also applicable to what analyzed the machining error of other types.(2)Research on method of error distribution based on genetic algorithm and sensitivity analysis:In order to save the cost of machinery,in the design stage the geometric errors generated by the machine were distributed reasonably in accordance with the machine structure,thus the accumulation of errors between adjacent parts was reduced.Based on the boring systemof TX1600G boring-milling machining center,combining multi-body system theory,model of volumetric errors for the boring system was established and accordingly formulas of cumulative errors were calculated in the first place.Secondly import geometric errors of components onto which you build formulas.With calculating and analyzing to get error sensitivity coefficient of related components,based on this kind of error distribution coefficients were proposed principle.With application of genetic algorithms to verify the accuracy of the method and this way was applicable to what analyzes other multi-axis machine error of error distribution in the final.(3)Researching on error compensation technology of boringError curves were fitted by data fitting of workbench ram stage for boring system in X,Y,Z direction,and earch movement axis have different characteristics in traveling for boring-milling machining center.These errors were compensated by segment and forming a complete error compensation curve and the experimental verification was obtained by this method in the final. |
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