面向工程陶瓷的单颗金刚石磨粒划擦磨损规律

为了研究工程陶瓷平面磨削中金刚石砂轮的磨粒磨损规律,制备圆锥形单颗粒金刚石磨具模拟实际磨粒切削刃。以金刚石磨粒的尖端圆弧半径表征磨粒切削刃锋利程度与磨削能力,并用圆弧半径的磨损规律等效描述切削刃磨损特性。采用基于扫描电镜与数据拟合的技术测量单颗磨粒金刚石尖端圆弧半径。运用单因素试验及正交试验分析了金刚石颗粒尖端形状、材料种类与加工参数对磨粒磨损规律的影响。实验结果表明,当顶锥角2θ为120°、磨削深度ap0.01 mm时,金刚石磨粒具有较高划擦寿命。各因素的影响主次顺序为:顶锥角>磨削深度>工作台速度。本研究为金刚石砂轮磨粒规格和磨削用量的选取提供了重要参考。

Wear rule of single diamond grit when scratching on engineering ceramics

To investigate the abrasive wear mechanism of surface grinding on engineering ceramics, conical single diamond tools were designed and prepared to simulate the cutting edges of actual abrasive grain. The tip arc radius of the diamond grain was taken to characterize the sharpness and grinding ability of the grain, and the abrasive wear rule of the arc radius was used to describe the wear performance of cutting edges. The tip arc radius of the single diamond grit was measured based on the scanning electron microscope and data fitting theory. The effects of different single diamond grit shape, different types of materials and machining parameters on the abrasive wear rules were analyzed by means of single factor tests and orthogonal test. The results showed that the single diamond grit with the tip angle 120° at the grinding depth 0.01 mm had higher service life. The influence degree sequence of parameters was shown as follows： tip angle 〉 the grinding depth 〉 the feeding of workbench. The results of this study provides important reference for the selection of abrasive type of diamond grinding wheel and the grinding parameters during engineering ceramics grinding process.