高強(qiáng)度鋼高效磨拋用釬焊金剛石磨盤的制備及性能研究
[Abstract]:High strength steel is more and more widely used in aerospace, ship manufacturing, chemical equipment and other fields. At present, resin grinding wheel is mainly used for surface grinding and polishing treatment, which exposes problems such as low material removal rate, easy wear and tear of grinding wheel, and large smell dust and so on. In order to solve the above problems, the paper uses brazing technology to weld diamond on the surface of steel substrate to make grinding and polishing tools. The advantage of good heat dissipation effect is to realize high efficiency grinding and polishing of high strength steel. The innovative research work accomplished in this paper mainly includes: (1) in order to obtain the brazing effect of fine abrasive particles and uniform thickness of solder layer, the technological conception of vacuum brazing diamond with large grain size alloy solder is put forward and the geometric model is established. The equations of the relationship between large grain size alloy solder and diamond grain size are obtained, and the practical solution based on the wetting angle of alloy solder is obtained. On the basis of this, the new abrasive distribution technology is determined, and the geometric model of reasonable brazing between diamond abrasive and solder is established, and the matching formula of diamond particle size and solder particle size with ideal brazing effect is obtained. The formula shows that the optimum particle size of Ni-Cr alloy brazing diamond is 60 mesh. The results of brazing test show that the alloy solder has a good climbing effect on diamond, and the average embedding height is about 30% of the diameter of diamond. (2) by analyzing the wear characteristics of resin grinding wheel, the matrix of brazed diamond disc is designed structurally. Combined with ANSYS finite element simulation analysis and grinding force model, the optimum size of grinding disc matrix was determined. The machining process of brazed diamond disc matrix is determined by stamping process and outer circle chamfering process to control the precision of matrix dimension. (3) based on the grinding conditions and abrasive particle parameters, the machining process of brazed diamond disc matrix is determined. Based on the analysis of the optimum selection mechanism of abrasive particles, the abrasive geomorphology with uniform distribution or point (cluster) order of grinding and throwing slope surface, dense and uniform arrangement of grinding edge and cluster-like arrangement of grinding plane leaf sequence is determined. The ordered arrangement of diamond abrasive particles is realized by laser drilling process, and the effective arrangement of plane and arc surface can be realized by the template material with good adhesion. (4) the brazed diamond grinding disc is developed by synthetically utilizing the above research results. The grinding and polishing test of AH36 marine high strength steel was carried out. Compared with the conventional resin grinding wheel of the same specification, the average material removal rate is increased by about 40%, and the polishing life is increased by more than 11 times. The comparative analysis of abrasive wear state and wear debris morphology shows that the single abrasive particle removal amount of brazed diamond disc is large, the grinding point temperature is lower than that of resin grinding wheel, and it is not easy to form a molten ball. (5) based on the principle of elastic vibration isolation, it is difficult to form a molten ball. (5) based on the principle of elastic vibration isolation, The vibration isolator of grinding disk is designed, and the free damping structure grinding disk is designed based on the principle of damping vibration and noise reduction. The results of noise and vibration test show that the vibration value of the disc without vibration isolator is 31.6 higher than that of the same size 100mm resin grinding wheel, and the vibration value of the disc with vibration isolator is 4, and the vibration value of the free damping structure grinding disc is 31.3 lower than that of the resin grinding wheel, and the noise value is 7.8.
【學(xué)位授予單位】:南京航空航天大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:TG74
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