采用双层热丝化学气相沉积(CVD)法在硬质合金阶梯刀具表面制备了金刚石涂层, 对比分析了无涂层和涂层刀具钻削复合纤维刹车片的钻削特性和磨损性能以及加工孔的表面质量。结果表明: 在高速钻削条件下, 涂层刀具的轴向力和扭矩明显小于无涂层刀具的, 表现出更好的钻削性能; 当以相同的转速和进给量钻削出10个孔后, 涂层刀具的后刀面磨损高度约为0.025 mm, 远小于磨损标准(0.2 mm), 无涂层刀具的后刀面磨损高度(0.15 mm)则接近磨损标准, 涂层刀具的耐磨性能优于无涂层刀具的; 涂层刀具钻削孔的四周圆滑, 没有毛刺及撕裂现象, 其表面质量好于无涂层刀具钻削孔的。

The diamond coating was prepared on the surface of the cemented carbide step cutting tool by using double-layered hot filament assisted chemical vapor deposition (CVD). Then the drilling characteristics and wear properties of the uncoated and coated cutting tools during drilling the composite fiber brake pad, as well as the surface qualities of the machined hole, were compared and analyzed. The results show that under the high speed drilling condition, the axial force and torque of coated cutting tool were obviously lower than those of uncoated cutting tool, showing a better drilling performance. After drilling 10 holes at the same speed and feed rate, the flank wear height of the coated cutting tool was about 0.025 mm, which was much less than the wear standard (0.2 mm), while that (0.15 mm) of uncoated cutting tool was close to the wear standard, indicating that the wear resistant of the coated cutting tool was better than that of uncoated cutting tool. The hole boundary drilled by the coated cutting tool was smooth and had no burr and tearing. The surface quality was better than that drilled by uncoated cutting tool.