Hardened steel has been widely used in the aviation and automotive fields owing to its unique properties. However, the poor machining performance for finishing hardened steel owing to low attainable cutting speeds and rapid tool wear has become a bottleneck in the functional performance and range of applications. In this study, a radial high-speed ultrasonic vibration cutting (R-HUVC) process was adopted for improving the machining performance of finishing hardened steel. R-HUVC involves the use of radial ultrasonic vibrations which ensure the separation of the tool and workpiece. The kinematics of R-HUVC were analyzed through a theoretical model, and its surface generation mechanisms in the intermittent cutting mode were studied. Then, finish turning experiments were conducted on the cutting force, surface roughness, and tool life to validate its machining performance compared to that of conventional cutting (CC) for a wide range of finishing conditions. The experimental results showed that R-HUVC can realize a lower cutting force, longer tool life, and better surface roughness compared to CC. It was verified that R-HUVC can be applied to high-speed machining for the finish turning of hardened steel because it improves the machining performance.

中文翻译：

---

径向高速超声振动切削对淬硬钢精车加工性能的影响

淬火钢以其独特的性能被广泛应用于航空和汽车领域。然而，由于可达到的切削速度低和刀具磨损快，精加工硬化钢的加工性能差，已成为功能性能和应用范围的瓶颈。在这项研究中，采用径向高速超声振动切削 (R-HUVC) 工艺来提高精加工硬化钢的加工性能。R-HUVC 涉及使用径向超声波振动，确保工具和工件的分离。通过理论模型对R-HUVC的运动学进行了分析，并研究了其在断续切削模式下的表面生成机制。然后对切削力、表面粗糙度、和刀具寿命，以验证其在各种精加工条件下与传统切削 (CC) 相比的加工性能。实验结果表明，与CC相比，R-HUVC可以实现更低的切削力、更长的刀具寿命和更好的表面粗糙度。经验证，R-HUVC 可用于淬硬钢的精车高速加工，因为它提高了加工性能。