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利用高频感应钎焊技术制备单层金刚石静强度实验样块和磨削砂轮,比较了单颗金刚石磨粒在磨削过程中所承受的平均法向和切向载荷分别与其钎焊后的静压强度和静剪切强度大小,结合对磨削过程中磨粒的磨损形态的观察,揭示钎焊金刚石砂轮在磨削过程中金刚石磨粒的磨损机理.实验结果表明:一般磨削过程中金刚石磨粒所承受的载荷远小于其静强度;钎焊后磨粒的静强度主要受钎焊时的真空度和钎焊加热时间的影响,真空度越高,静强度越大,钎焊时间越长,静压强度损失越大,而静剪切强度却存在一个最佳的钎焊时间;利用高频感应加热方式制备金刚石工具的磨粒焊接强度,完全能满足一般磨削加工要求,在磨削过程中磨粒以微破碎为主,很少有脱落和整颗折断现象.
Single-layer diamond static strength test specimen and grinding wheel were prepared by high-frequency induction brazing technique. The average normal and tangential loads of single diamond abrasive grains in the grinding process were compared with those after brazing Pressure intensity and static shear strength, the wear mechanism of diamond abrasive grains during the grinding process of brazed diamond wheel was revealed by observing the wear patterns of the abrasive grains during the grinding process.The experimental results show that during the normal grinding process, the diamond The load of abrasive particles is far less than their static strength. The static strength of brazed particles is mainly affected by the vacuum degree of brazing and the brazing heating time. The higher the degree of vacuum, the greater the static strength, the longer the brazing time Long, static pressure loss, the greater the static shear strength but there is an optimal brazing time; the use of high-frequency induction heating diamond abrasive preparation tool welding strength, fully able to meet the general grinding requirements, grinding Grinding the process of micro-broken abrasive-based, very few off and the whole broken phenomenon.