Research On Surface Quality In Diamond Cutting Of Titaum Alloys

Titanium alloy characterizes high specific strength, high te mperatureresista nce, good corrosion resistance and a series of excelle nt mecha nicalproperties, so it has became aerospace manufacturing strategic materia ls.However, its lower therma l conductivity, lower elasticity modulus, goodchemical activity make it very hard to get good surface machining quality. Thisis important and difficult proble m for our aerospace industry develop ment. Inorder to get high qua lity cutting process, respectively to study the surface qua lityand tool wear. Altho ugh dia mond tool is the best choice ofprecis ion and ultra-precis ion processing, it prone to a serious tool wear in theprocess of titanium alloy cutting, making it difficult for excelle nt surface quality.But ultrasonic vibration cutting can reduce cutting force and cutting temperature,improve cutting performance of lubrication. So, we applied ultrasonic vibrationto the cutting tita nium a lloy for improve tool life and get a better surface quality.Titanium a lloy surface quality and tool wear ma inly affected by cuttingtemperature and cutting force. Two-dime ns iona l finite eleme nt model ofTi-6Al-4V has established with the cutting specia l software AdvantEdge toanalyse cutting force and cutting te mperature distribution of three cutting ways,they are ordinary precisio n cutting, one dimens iona l ultrasonic vibration cuttingand ultrasonic elliptica l vibration cutting. Than we ana lyzed the influence ofcutting parameters and ultrasonic vibration cutting parameters on the temperatureand force, it provides theoretica l basis for future experiment.Residua l stress is a important measure of surface quality. On the based ofTwo-dimens iona l finite ele ment model, the resid ual stresses of three cuttingmodes were studied. Combined cutting te mperature and cutting force distributionwith plastic strain in the workpiece surfaces to discuss the reason of residua lstress. After that, we researched the different cutting parameters take the impacton the residual stress in different cutting way, than investigated the optima lparameter values in order to attain a lower res idual stress inultrasonic elliptica l vibration cutting.On the basis of above research, we carried on one dimens iona l ultrasonic vibration cutting experiment, respectively measured cutting temperature andcutting force than co mpared with s imulatio n result, va lidating the s imulationmodel is verified. Used SEM observed and analysed the microstructure and ma incomponents of used tools to probed the tool wear morphology and mecha nis m. Inorder to get better surface quality, we explored the impact between tool wear andcutting parameters, than ana lysed master-subordinate relations hip of differentparameters on surface quality. For titanium allo y prec isio n cutting processparameter optimization provide theoretical foundation.