Ultra-high-speed grinding is an effective technology used in high-performance precision grinding of engineering ceramic, glass, carbide, titanium alloy, stainless steel and other difficult materials. In ultra-high-speed grinding, grinding wheel speed reaches 150–300 m/s or higher, comparable to muzzle velocity of a bullet. When the working grinding wheel is broken during high-speed rotation, the flying speed of the debris is even higher than the muzzle velocity of a bullet. This condition poses a threat to the operator’s safety and damages the machine tool, resulting in large economic losses. This study assessed the accidental explosion of an ultra-high-speed bronze bond CBN grinding wheel in actual working process. Based on fractography analysis of explosion grinding wheel and numerical analysis of the grinding wheel safety caused by centrifugal force, grinding forces, and adhesive failure between the grinding wheel matrix and abrasive layer, this study investigated the causes of the explosion of an ultra-high-speed grinding wheel. The following reasons for the accident were found: (1) defects appear at thread holes in the abrasive layer of the grinding wheel, (2) powder metallurgy defects in the transition layer of the grinding wheel, (3) fatigue cracks appear along the interface between the bond and grain under the centrifugal and grinding forces, and (4) adhesive failure at the interface between the grinding wheel matrix and abrasive layer.

超高速磨削是一种有效的技术，用于对工程陶瓷，玻璃，碳化物，钛合金，不锈钢和其他难加工材料进行高性能精密磨削。在超高速磨削中，砂轮速度达到150-300 m / s或更高，与子弹的枪口速度相当。当工作砂轮在高速旋转中损坏时，碎屑的飞行速度甚至比子弹的枪口速度还要高。这种情况会对操作人员的安全构成威胁，并损坏机床，从而造成巨大的经济损失。这项研究评估了在实际工作过程中超高速青铜结合剂CBN砂轮的意外爆炸。在对爆炸砂轮进行分形分析的基础上，对离心力，磨削力以及砂轮基体与磨料层之间的粘结破坏引起的砂轮安全性进行了数值分析，研究了超高碳钢爆炸的原因。高速砂轮。发现事故的原因如下：（1）砂轮磨料层的螺纹孔处出现缺陷，（2）砂轮过渡层的粉末冶金缺陷，（3）沿界面出现疲劳裂纹（4）砂轮基体和磨料层之间的界面处的粘合破坏。这项研究调查了超高速砂轮爆炸的原因。发现事故的原因如下：（1）砂轮磨料层的螺纹孔处出现缺陷，（2）砂轮过渡层的粉末冶金缺陷，（3）沿界面出现疲劳裂纹（4）砂轮基体和磨料层之间的界面处的粘合破坏。这项研究调查了超高速砂轮爆炸的原因。发现事故的原因如下：（1）砂轮磨料层的螺纹孔处出现缺陷，（2）砂轮过渡层的粉末冶金缺陷，（3）沿界面出现疲劳裂纹（4）砂轮基体和磨料层之间的界面处的粘合破坏。