Study On Effect Of Vibration Of Fixed Diamond A-Brasive Grain Saw On Surface Morphology Of Slice

The Fixed Diamond Abrasive Wire Saw(FDAW)is the preferred tool for machining SiC single crystals,and wire saw slicing is also a key process in the processing technology of SiC single crystal materials.In order to reduce the scrap rate in the subsequent process and improve economic efficiency,it is necessary to cut a section with a small surface damage layer and a low surface roughness.Because the wire saw has great flexibility,its vibration has a significant effect on the microscopic geometry of the slices.Therefore,the dynamic characteristics of the wire saw and the effects of wire saw vibration on the surface roughness of the chips are studied in this paper.The vibration model of the wire saw was constructed based on the theory of axial movement string.The multi-scale method was used to solve the parametric vibration model of the tension fluctuation The effects of tension fluctuation,wire saw velocity and damping on the steady-state region of the wire saw system were analyzed.When the fluctuation of the tension is large,the parametric resonance of the system has large amplitude,and the steady-state response area also becomes large.Increasing the wire saw velocity and damping coefficient will reduce the steady-state response area and amplitude of the systemConstructing a random external excitation model for the vibration of the wire saw.Based on the random distribution of the abrasive particles in the longitudinal direction of the wire,a cutting force random amount model for wire saw machining was established.The influence of different processing parameters on the main parameters of the random cutting force model was analyzed.With the feed rate and tension pressure of the workpiece are increased,the force of a single abrasive particle would increase.The sawing velocity was increased,the number of abrasive particles involved would be reduced,reducing the force of a single abrasive grain.The experimental results verify the reliability of the modelThe multiple-regression method was used to establish the slicing surface roughness model with feed speed,wire saw velocity,and tension of the wire saw.The indirect effect that the wire saw vibration on the surface quality was quantitatively analyzed.Through the range analysis,the optimal parameters of the experiment and the effects of different processing parameters on the surface roughness of the slicing were obtained.The correctness of the roughness model was verified by experiments.The vibration of the wire saw and its effect on the roughness of the slicing surface were analyzed by experimental methods,and the direct effect that the wire saw vibration on the cutting quality was qualitatively studied.The wire saw velocity increased or the feed rate of the workpiece reduced,the main frequency of the wire saw had a little influence,but the amplitude of wire saw vibration was decreased.The tension of the wire saw has a key effect on the main frequency of the wire saw.The increase of main frequency of the wire saw and the decrease of the amplitude were favorable to the surface roughness of the slice.