Study on high-speed machining of Inconel 718 focusing on tool surface topography of CBN cutting tool
Study on high-speed machining of Inconel 718 focusing on tool surface topography of CBN cutting tool
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DOI：
10.1007/s00170-015-8006-1
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
T. Sugihara;Shota Takemura;T. Enomoto
中科院分区：
文献类型：
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作者：
T. Sugihara;Shota Takemura;T. Enomoto
镍基超合金如Inconel 718提供了几个优点，包括高温强度和高耐腐蚀性。因此，对这种材料的需求迅速增加，特别是在航空工业中。另一方面，由于其机械和化学性质，它们被认为是最难切削的材料之一，并且刀具寿命极短。最近，立方氮化硼（CBN），这是所有已知材料中第二硬的材料，作为切削工具的材料受到了极大的关注，并且已经在许多切削领域建立了自己的地位。然而，CBN刀具在实际使用中的性能仍然不足，特别是在Inconel 718的高速加工中。为了克服这个问题，我们首先进行了正交切削实验Inconel 718在广泛的切削速度（20-300米/分钟），以确定在连续切削操作的CBN刀具的磨损机制。其结果是，它被发现，微工具的表面形貌，如工具前刀面上的磨削痕迹，影响CBN刀具的凹坑磨损的进展时，切削速度增加到超过100米/分钟。基于这些结果，我们准备了几个不同的表面形貌的切削刀具，并评估其切削性能。实验结果表明，抛光前刀面减少了约40%的初始凹坑磨损相比，非抛光工具。
Nickel-based superalloys such as Inconel 718 provide several advantages, including high-temperature strength and high corrosion resistance. Therefore, the demand for such materials has rapidly increased, particularly in the aircraft industries. On the other hand, they are known to be among the most difficult-to-cut materials due to their mechanical and chemical properties, and the tool life is extremely short. Recently, cubic boron nitride (CBN), which is the second hardest of all known materials, has received a great deal of attention as a material for cutting tools and has already established itself in many areas of cutting. However, the performance of CBN tools is still insufficient in practical use, especially in the high-speed machining of Inconel 718. To overcome this problem, we first conducted orthogonal cutting experiments on Inconel 718 in a wide range of cutting speeds (20–300 m/min) in order to identify the wear mechanisms of the CBN tool in continuous cutting operation. As a result, it was found that the micro-tool surface topography, such as grinding marks on the tool rake face, affected the progression of the crater wear of the CBN tool when the cutting speed was increased to over 100 m/min. Based on these results, we prepared several cutting tools with different surface topography and evaluated their cutting performances. The experimental results showed that the polished rake face reduced the initial crater wear by approximately 40% compared to the non-polished tool.