A New Method For Multilayer Orderly Arrangement Diamond And Its Application

Diamond grinding tools are widely used to stone machine hard and brittle materials, such as cemented carbide,engineering ceramics,optical glass,semiconductor materials. The orderly arraying of diamond grits on the tool is considered as a novel trend for improving the performance of the tool, and has drawn much attention by domestic and overseas scholars and industry. While existing methods of orderly arrangement have some disadvantages such as the complex processes, low efficiency and the difficulty of industrialization.In this thesis, a new improved orderly arrangement of diamond grits method was presented, namely, arraying micro-hole adsorbent orderly arrangement.The orderly arraying device was designed and prepared to investigated the effect of different factors such as influence of adsorption pressure, micropore diameter and particle size, auxiliary vibration on the diamond grits adsorption and orderly feeding in the process of orderly arrangement of diamond grits. Based on the novel method for orderly arrangement of diamond grits, different diamond saw blades were prepared to saw granite in order to test the grinding performance such as sharpness,wear rate and the surface roughness of the different diamond saw blades in the process of grinding Luoyuan Red granite. And the tangential grinding force of single diamond particle of different diamond saw blades in the process of grinding are analyzed. The different wear form of diamond grits were observed and analyzed in sawing the granite with different saw blades. Research results show that there is a minimum pressure of adsorbing single diamond particle using the orderly arraying device depends on the micro-hole’s diameter and the size of diamond grits. By controling the frequency and time of auxiliary vibration could improve the effect of adsorbing diamond grits.The data shows that the density of microhole and particle size of the powder are related with feeding depth when using the orderly arraying device. The problem in feeding diamond grit can be sovled by using the sieved powder (150-200),reducing the return rate and keeping quantitative positive pressure.The sharpness of the saw blades with diamond grit’s orderly arrangement are higher than that of regular saw blade. The wear rate of saw blades with diamond grit’s orderly arrangement is also lower than the regular one in wet sawing. While this phenomenon is not obvious in dry sawing. The tangential grinding force for single diamond gritof the saw blade with orderly arrangement of diamond grit is lower than that of regular one, and the titanium coating diamond grit owns the smallest tangential grinding. The morphology analysis shows that there are five forms of diamond wear, namely,complete protrusion,micro-fracture,polished,macro-fracture and pull-out. The diamond grit’s pull-out percentage of the saw blade with orderly arrangement is lower than that of regular one. And the the blade with orderly arranged titanium coating diamond grits owns the smallest pull-out percentage.