Research On Mechanics Characteristics And Wear Mechanisms Of Micro Milling Cutter

With the increasing need for microminiaturization product and the development of the technology, Micro milling technology plays an more and more important role in complicated 3D micro parts manufacture. Currently, more and more research has been carried out on Micro milling technology in developed countries. Micro machine tools which focused on surface quality, cutting force, wear, cutting life, chip, and the processing capacity have been manufactured.Based on the micro three-axis vertical milling machine, On purpose of increasing the tool life, improving efficiency, assuring the quality, and providing a theory and experiment basis, method of finite element analyze and experiment has been used. Meanwhile the mechanics identity, wear mechanisms, and cutting life of the micro tool have been studied.First of all, the mechanics characteristics of micro milling cutter have been analyzed using FEM. The inherent frequency and mode of vibration have been studied. The stress and distortion characteristics of the micro milling cutter have been discussed.Secondly, through substantial tool wear experiments, and the using of SEM and alpha ray spectrometer, the wear mechanisms of micro milling cutter have been researched, using the TiAlN coated carbide alloy microtool (diameter 0.5mm), and duralumin LY12, high flexibility alloy steel 3J21, stainless steel as the workpieces. The wear mechanisms of uncoated carbide alloy micro cutter, with the workpiece of LY12, have been researched, too. The coat shed, tool tip breakage, diffusive wear have been observed as the main form of tool wear.Finally, the life of micro milling cutter has been studied. The tool wear characteristics have been analyzed, in the condition of down milling, with the spindle speed of 160000r/min, 140000r/min, 120000r/min, as well as in the condition of up milling with the spindle speed of 140000r/min. With the date of the experiments, the curve of ln ~ lnT has been plotted, the expression of ~ T has been established. It is found that the wear rate of up milling is faster than that of the up milling. The faster of the cutting speed, the faster of the tool wear rate, but the affect of the cutting speed is smaller that of conventional milling cutter. vc vc...