| Metal cutting develops toward high-speediness, high precision andautomation. If chips are not broken, the metal cutting processes will not carry outefficiently and smoothly, especially in automated machining systems. Three-dimensional groove insert has a good chip breaking performance,the wide rangeof chip breaking and service life. So a great deal of research has been devoted inunderstanding the mechanism of chip-breaking grooves. Because of chipbreaking process is complex, the study on cutting force model is still in the initialstage in now days. Correspondingly its cutting force model is systematicallystudied and its cutting force model predictive system is developed in thisdissertation by simulation. Some researching results of theory significance andapplication value have been drawn.Firstly, the varying rules of cutting force is found based on cuttingexperiments, The effect rules of chip breaking on chip section profile isresearched,the model of chip section profile coefficient is established.Secondly, the analysis of deformation of cutting layer in cutting process andthe distribution of Stress and frictional force on the rake face,study on thevarying of tool geometry in groove structure,the model of rake face with theskeleton of lean groove is established.Thirdly, using the minimum energy method, shear angle model isestablished when three-dimensional chip breaking groove cutting. Combinedwith the theoretical formula of cutting force can be predicted.Chip-breaking areasare compared with experimental data. Results show the model is reasonable.Lastly, Application of simulation technology to carry out a series ofcomparative study.Through analysis of whether the groove structure、chenging the parameters of tool geometry(boss height、ratio of groove width to depth)and studying effect rules of cutting force for surface coating insert.The objectfunction is optimized by the optimization theory to provide theoretic basis. |
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