Development of cBN(cubic boron nitride)-Coated Cutting Tools

在这项研究中，我们制造和评估cBN涂层刀具，这可能适用于难切削材料的切削过程和环境友好的制造工艺。众所周知，cBN具有优异的耐热性和耐磨性，但其抗倾翻性不足。因此，我们认为，cBN涂覆的切削工具，其中薄cBN膜粘附在碳化钨基体上，具有与上述性能相当的性能。首先，我们研究了用PVD法制备的cBN薄膜的摩擦学性能。结果表明，cBN薄膜在大气和真空条件下均具有良好的摩擦学性能，如低摩擦系数和耐磨性，模拟了实际切削过程中的刀具刃口状况。接下来，我们研究了实际切削刀具的切削性能，例如CBN涂层钻头和球头端米尔斯。即， 关于我们 我们制造了这些工具，并通过几次切削试验，例如切削模具钢工件，评价了cBN涂覆的工具的有利特性。结果表明，所制备的CBN涂层刀具具有比由高速钢和碳化钨制成的传统刀具更好的切削性能。然而，我们也观察到，制造的cBN涂层的工具的切削性能是显着不如传统的TiN和氮化钛涂层的工具，因为cBN膜的厚度和粘附力是不够的。最后，我们研究了具有特殊设计的切削刃的烧结cBN球头米尔斯立铣刀的切削性能。预计这些工具具有良好的切削性能，类似于具有大厚度和良好粘附性能的cBN涂层工具。我们的实验结果表明，新设计的烧结cBN立铣刀米尔斯具有优异的切削性能，与传统的氮化钛涂层碳化钨立铣刀相比。少

In this study, we fabricated and evaluated cBN-coated cutting tools, which may be applicable to the cutting process of difficult-to-cut materials and environmentally friendly manufacturing processes. It is well known that cBN has excellent heat resistance and antiwear properties, but its anti-tipping property is insufficient. Therefore, we consider that a cBN-coated cutting tool, in which a thin cBN film is adhered on a tungsten carbide substrate, has properties comparable to those mentioned above. First, we investiga1ed the tribological properties of the cBN film, which was fabricated by the PVD process. The results showed that the cBN film has excellent tribological properties, such as a low frictional coefficient and an antiwear property, under both atmospheric and vacuum conditions, which simulated the tool edge condition in an actual cutting operation. Next, we investigated the cutting properties of actual cutting tools, such as cBN-coated drills and ball-nosed end mills. Namely, … More we fabricated these tools and evaluated the advantageous characteristics of the cBN-coated tools through several cutting tests, such as the cutting of a mold steel workpiece. The results clarified that the fabricated cBN-coated tools have better cutting performance than conventional tools made of high-speed steel and tungsten carbide. However, we also observed that the cutting performance of the fabricated cBN-coated tools is significantly less progressive than those of conventional TiN-and TiAIN-coated tools, because the thickness and adhesion of the cBN film are insufficient. Finally, we investigated the cutting performance of the sintered cBN ball-nosed end mills with a specially designed cutting edge. It was expected that these tools have good cutting performance, similar to that of the cBN-coated tool with large-thickness and good adhesion properties. The results of our experiment clarified that the newly designed sintered cBN end mills have excellent cutting performance, compared with a conventional TiAIN-coated tungsten carbide end mill. Less