近α钛合金砂带磨削的磨粒磨损研究

Study of abrasive wear in belt grinding of a close alpha titanium alloy

针对锆刚玉磨料砂带和近α钛合金工件材料的特点,通过三维体式显微镜对锆刚玉磨料砂带干式磨削近α钛合金时的磨粒磨损面积、磨粒高度、磨损量和金属去除量进行了研究;同时采用扫描电子显微镜和能量分散光谱扫描对磨粒磨损形态进行研究;并分析不同磨粒磨损阶段对磨削工件表面的影响。研究表明:磨粒磨损形态有脱落,磨耗和破碎,主要以磨耗磨损为主;砂带线速度vs、进给速度vw和磨削深度ap增大均使砂带磨粒磨损加剧。在低切削速度、低进给量、低切削深度下锆刚玉磨料砂带加工钛合金时的切削加工性最好,因此锆刚玉磨料砂带适用于钛合金的干式磨削加工。

Zireonia alumina belts were used for the dry grinding of a close alpha titanium alloy. Wear flat and hold height of worn abrasive were analyzed with 3D-Viewer microscopy. The ground surface roughness was measured with the Mahr Perth meter M1 instrument, and the stock removal was measured. SEM and EDS analyses were carried out on the worn abrasives to determine the grain wear mechanisms. Special experiments were designed to investigate the ground surface with different grinding stages of belts abrasive for grinding close alpha titanium alloy titanium alloys. The results showed that under the grinding conditions of lower grinding speed, lower feed rate and lower depth of cut, the zireonia alumina belts have a longer service life, lower cutting abrasive wear and better surface. It means the zirconia alumina belt is suitable for the dry grinding processes of the close alpha titanium alloy.