A range of PCBN tools were utilized for turning iron-based superalloy in dry environment and their cutting performance was researched from the perspective of tool wear, tool life, cutting force, cutting temperature, and machined surface roughness. The experimental results revealed that the cutting temperature increased, while the resultant cutting force exhibited an initial rise followed by a decline as the cutting speed increased. The PCBN tools with TiC or TiC+SiCw ceramic bonding agent and low CBN content (≤65 %) were chipped and even fractured in the preliminary stage of the cutting process and were not suitable for cutting the iron-based supperalloy. The PCBN tools with Co-W-Al ceramic bond agent and high CBN content (85 %) performed well in the cutting process, while for every 50 m/min increase of cutting speed, tool life was reduced by approximately a half. An exceptional surface quality could be achieved using this specific type of PCBN tools. However, once the wear value of the flank faces reached about 0.25 mm, the surface roughness began to increase noticeably. In order to achieve higher surface quality, the suggested cutting time for continuous dry cutting iron-based superalloy using the PCBN tools at different cutting speeds was obtained. Rake face wear was dominated by adhesion, chipping, flaking and grooving, and built-up-edge and microcracks also appear at relatively higher cutting speed. Flank face wear showed brittle flaking off at the lower cutting speed (50 m/min), while when cutting speed was increased (100 m/min-200 m/min), abrasion and adhesion wear were dominant.

中文翻译：

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PCBN 工具在干切削铁基高温合金中的性能


在干燥环境中使用一系列 PCBN 刀具对铁基高温合金进行车削，并从刀具磨损、刀具寿命、切削力、切削温度和加工表面粗糙度的角度研究了它们的切削性能。实验结果表明，切削温度升高，而合成切削力表现为初始上升，然后随着切削速度的增加而下降。使用 TiC 或 TiC+SiCw 陶瓷结合剂和低 CBN 含量 （≤65%） 的 PCBN 工具在切削过程的初期阶段出现碎裂甚至断裂，不适合切削铁基合金。含有 Co-W-Al 陶瓷结合剂和高 CBN 含量 （85%） 的 PCBN 刀具在切削过程中表现良好，而切削速度每提高 50 m/min，刀具寿命就会缩短大约一半。使用这种特定类型的 PCBN 工具可以实现卓越的表面质量。然而，一旦侧面的磨损值达到约 0.25 mm，表面粗糙度开始明显增加。为了获得更高的表面质量，获得了使用 PCBN 工具在不同切削速度下连续干切削铁基高温合金的建议切削时间。前刀面磨损主要由粘附、碎裂、剥落和开槽为主，在相对较高的切削速度下也会出现积屑瘤和微裂纹。在较低的切削速度 （50 m/min） 下，后刀面磨损表现为脆性剥落，而当切削速度提高 （100 m/min-200 m/min） 时，磨损和粘附磨损占主导地位。