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我厂液压车间生产的CB32和CB45型齿轮油泵泵体，其材料为ZL101，内孔加工尺寸为φ52+0.029、φ52+0.010，表面光洁度为▽8（图1），由于是铝合金材料，强度、硬度低、塑性大，刀刃易粘屑瘤，故内孔的几何精度和表面光洁度质量差。为了改进镗刀的角度，经过多次试验，终于摸索出加工铝合金内孔镗刀。材料选用YG6硬质合金，经过近一年的生产实践证明，效果良好，达到了图纸设计要求。
The CB32 and CB45 type gear pump body produced by our hydraulic workshop has the material of ZL101, inner hole machining size of φ52 + 0.029, φ52 + 0.010, and surface finish of ▽ 8 (Figure 1). Since it is made of aluminum alloy, the strength , Low hardness, plasticity, easy cutting edge, so the geometric accuracy of the hole and the surface finish quality is poor. In order to improve the perspective of boring knife, after many tests, finally worked out the processing of aluminum bore boring knife. Material selection YG6 cemented carbide, after nearly a year of production practice has proved that the effect is good, to achieve the design requirements of the drawings.