Trans-scale Design Method On Safety And Research On Wave Mechanics Damage Characteristics Of High Speed Milling Cutter

In the high-speed milling process, because of its high cutting speed and intermittent cutting load condition, milling cutter and its components under high strain rate stress state change, which makes the safety problem become prominent. Because of the difference of the stress level and the nature, safety problem also shows different form and degree. Safety problem were occurred before ISO15641 macro criterion make sense, the macro criterion of delayed performance is more prominent, control of cutter mesoscopic level and the criteria need to be revealed.For uneven wear of high-speed milling process, cutter tooth friction contact state model was established under the effect of vibration according to the influence of vibration on the cutter contact relationship, which solve the cutter tooth friction contact point position of the contact point and the cutting speed.Based on molecular dynamics and continuum mechanics overlapping band model, a high-speed cutter cross-scale correlation method was put forward. Fe super cell model was established by computing element type and then the number of atoms. The verification of sensitivity that mesoscopic atomic group exercises have on the macro-structure deformation was given by exerting the different properties and horizontal load.Milling cutter safety entropy model was given to make quantitative measurements of atomic motion state and mesoscopic safety on the foundation of high-speed cutter macro security characterization and mesoscopic scale cross-linked. The use of milling cutter safety trans-scale response reveals the intrinsic link macro-Milling cutter design mesoscopic domains, and a high-speed cutter macro-structural level across the mesoscopic scale correlation was achieved using axiomatic design method.Through the analysis of the wave mechanics excitation of internal structure and propagation characteristics in the macro mesoscopic structural levels, the macro level and mesoscopic load transfer law were given, as well as the respective hierarchy caused structural damage and other security issues macro mesoscopic manifestations. This thesis utilize Hopkinson bar experiments to verify wave dynamics macro load failures in the internal structure of the transfer and establish contact between mesoscopic structure layer's deformation in the dynamic load shock and transformation forms of metal microstructure under the impact of action using molecular dynamics simulation, which provide a new theoretical basis for across scales design of milling cutter safe.The cutter tooth friction contact state model was established under the effect of vibration, and the cross-scale analysis method is proposed to determine the safety cutter's mesoscopic macro control variables through the research of the effect of forced vibration on the cutting contact relationship of each tooth. By the simulation of molecular dynamics, the variation characteristic of atomic group's energy under load was received, which revealed the sensitivity of high-speed cutter macro-mesoscopic structures across scales and characterized milling cutter's macroscopic and mesoscopic security. This thesis achieved the design of cross-scale correlation of a high-speed cutter macro-structural level using axiomatic design method and studied the macro-mesoscopic load's transfer law, what's more, analyzed macro mesoscopic features of milling cutter's structural damage.