磨料預釬焊金剛石工具的基礎研究
[Abstract]:With the development of science and technology and the progress of society, the application of sintered metal binder diamond tools is becoming more and more extensive, but the weak holding strength of metal binders to diamond abrasives is the most important factor that affects the service life of tools. Focusing on the key problem of holding strength of diamond abrasives, a new technology of surface metallization of diamond abrasives using high temperature brazing technology, I. E. diamond abrasive prebrazing technology, is put forward in this paper. The prebrazing diamond abrasive and its tools were prepared by this process. The main work of this paper is as follows: (1) the pre-brazing process of diamond abrasive is developed, and the pre-brazing diamond is prepared by using the Ni / Cr alloy composite solder and the Cu / Sn / Ti alloy brazing filler metal, respectively, which have been added with Cu / C _ e alloy powder, and the results are as follows: (1) the diamond pre-brazing technology is developed. The compressive strength of pre-brazed diamond is analyzed. The strength losses caused by the two kinds of brazing filler metals to diamond are 12% and 4.6%, respectively, which meet the requirements of application. (2) the optimum range of Ni / Cr alloy content in the composite brazing alloy is determined to be 30% and 35% respectively. The microstructure of the bonding zone of prebrazed diamond, the bonding area of prebrazed diamond and the fracture surface of pre-brazed diamond were analyzed by means of scanning electron microscope, energy spectrometer and X-ray diffractometer. The results show that The interfacial bonding strength of the chemically bonded Ni / Cr alloy pre-brazed diamond knots is higher than that of the non-brazed diamond knots. (3) the pre-brazing of Cu, Sn and Ti alloys has been determined. The average weight gain coefficient of diamond should not exceed 6.4. The microstructure of the bonding zone of prebrazed diamond, the bonding area of prebrazed diamond and the fracture surface of pre-brazed diamond were analyzed by means of scanning electron microscope, energy spectrometer and X-ray diffractometer. The results show that the interfacial bonding strength of the pre-brazed diamond knots formed between the brazing alloy and the diamond is higher than that of the non-brazed diamond segment. (4) the geometry of diamond abrasive particles is studied by ANSYS finite element simulation. The effects of abrasive concentration, thickness of carbide layer and area of prebrazing layer on the overall stress distribution and mechanical properties of pre-brazed diamond joints are investigated. The variation trend of the simulation results is consistent with the experimental results. (5) the slotted grinding wheel is prepared by pre-brazing diamond abrasive particles. The machining properties of diamond grinding wheel without pre-brazing diamond grinding wheel and pre-brazing diamond grinding wheel with Cu _ (Sn) Ti alloy prebrazed with Ni / Cr alloy composite brazing alloy were studied. The results show that when the content of Ni / Cr alloy is 35% or 30%, the comprehensive processing property of grinding wheel is the best, and the average weight gain coefficient of pre-brazed diamond is 6.4%. The sharpness and service life of the grinding wheel are the highest, and the processing performance of the two pre-brazed diamond grinding wheels is better than that of the non-brazed diamond grinding wheel.
【學位授予單位】:南京航空航天大學
【學位級別】:博士
【學位授予年份】:2016
【分類號】:TG731
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