高效加工硬质合金沉孔用新型金刚石工具与工艺研究

介绍了一种加工硬质合金沉孔用新型金刚石工具与加工工艺。采用电镀和烧结金刚石磨头在数控铣床上，以螺旋进刀的加工方式，在不同进刀量和进给速度条件下，研究加工效率和磨头寿命的关系；研究不同尺寸、槽型的电镀和烧结金刚石磨头对不同材质的硬质合金沉孔的加工效率和沉孔精度等的影响；并采用扫描电镜（SEM）和光学显微镜分析金刚石磨头的显微组织。结果表明:与电镀金刚石磨头相比，烧结金刚石磨头具有更好的使用寿命和加工效率，将传统硬质合金沉孔（φ13 mm×5 mm）每孔的加工时间由2 h缩短为10~15 min，且每只磨头的打孔寿命约为33~42个。该研究有望进一步增大硬质合金等硬脆带孔材料的应用范围。 

Research on new diamond tools and technology for highefficiency machining cemented carbide counterbore

A new diamond tool for machining cemented carbide counterbore and its processing technology are introduced. The relationship between the machining efficiency and the service life of the diamond grinding head is studied under the conditions of different cutting depth and feed speed by using the electroplating and sintered diamond grinding head on NC milling machine. The effects of different size and groove electroplating and sintered diamond grinding head on the efficiency and the precision of the cemented carbide counterbore with different materials are studied. The micro-structure of the diamond grinding head is analyzed by SEM and optical microscope. Results show that the sintered diamond grinding head has better working life and efficiency. The processing time of the per counterbore (φ13 mm×5 mm) of the traditional cemented carbide is shortened from 2 hours to 10-15 min, and the serving life of each sintered diamond grinding head can reach 33-40. The application of hard and brittle materials with counterbore machining will be promisingly expanded.