To explore the mechanism of formation and methods of control of edge burr in the grinding and forming of cemented carbide micro-drill, the morphology, material composition, and the edge structure of the generated area of the edge burrs are studied. Through indentation and scratch experiments, the critical grinding depth (h_c) of grinding machining is calculated to be 0.793–1.052 μm. The grinding experiments have verified the effects of the actual grinding depth h₀ of different single abrasive particles on the edge burr and the effectiveness of the method of controlling the burr by increasing the cutting angle of the abrasive particles. The experimental results show that edge burrs are mainly concentrated on the cutting edge close to the outer cylinder of the micro-drill. When the actual grinding depth h₀ of a single abrasive particle is less than the critical grinding depth h_c, workpiece material is mainly subjected to plastic deformation removal, the length L of the edge burr along the edge direction is 10–20 μm, the width W of the burr perpendicular to the edge direction is 1–3 μm. The formation of edge burrs is mainly related to the actual grinding depth and the abrasive grain cutting angle γ of abrasive grains. With the increase of h₀, the length L of the edge burr decreases, and the width W thereto first increases, then decreases. Increasing the cutting angle of abrasive particles can control the edge burr. By changing the grinding direction of the grinding wheel, the cutting angle of the abrasive particles can be changed from an acute angle to an obtuse angle, thereby eliminating the edge burr without affecting the performance of micro-drilling.

为了探索硬质合金微钻磨削成形中刃口毛刺的形成机理和控制方法，研究了刃口毛刺产生区域的形貌，材料组成和边缘结构。通过压痕和划痕实验，磨削加工的临界磨削深度（h _c）计算为0.793–1.052μm。磨削实验已经验证了实际磨削深度h _0的影响边缘毛刺上不同的单个磨料颗粒的分离以及通过增加磨料颗粒的切割角度来控制毛刺的方法的有效性。实验结果表明，边缘毛刺主要集中在靠近微钻外筒的切削刃上。当单个磨料颗粒的实际磨削深度h ₀小于临界磨削深度h _c时，主要对工件材料进行塑性变形去除，沿边缘方向的毛刺长度L为10–20μm，宽度W垂直于边缘方向的毛刺的长度为1-3μm。边缘毛刺的形成主要与实际磨削深度和磨粒的磨粒切削角γ有关。随着h ₀的增加，边缘毛刺的长度L减小，并且其宽度W首先增大，然后减小。增加磨料颗粒的切割角度可以控制边缘毛刺。通过改变砂轮的磨削方向，可以将磨料颗粒的切割角度从锐角改变为钝角，从而消除了边缘毛刺而不会影响微钻孔的性能。