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Chatter stability of synchronized elliptical vibration assisted milling
CIRP Journal of Manufacturing Science and Technology ( IF 4.8 ) Pub Date : 2019-12-19 , DOI: 10.1016/j.cirpj.2019.11.006
Jian Gao , Yusuf Altintas

This paper presents the dynamics to analyze the stability of ultrasonic elliptical vibration-assisted milling operations. The elliptical vibrations are delivered to the tool-tip with a piezo actuator integrated to tool holder at about 16.5 kHz with amplitudes of 10 μm and 5 μm in radial and tangential directions, respectively, with 90° phase difference. The chip thickness is modeled by considering the rigid body motion of the tool, regenerative and ultrasonic vibration amplitudes. The loss of tool contact with the workpiece at the ultrasonic vibration excitation frequency is considered in evaluating the directional factors in the regeneration of chip and process damping. The stability of the system is solved using the semi-discrete time-domain method and experimentally validated in milling Aluminum Al-7050 and AISI-1045 steel. It is shown that the ultrasonic vibrations can increase the stable depth of cuts if the periodic loss of contact between the tool and workpiece is maintained by selecting cutting speed, which is less than the tangential vibration velocity delivered by the actuator.



中文翻译:

同步椭圆振动辅助铣削的颤振稳定性

本文介绍了动力学,以分析超声椭圆振动辅助铣削加工的稳定性。椭圆形振动通过集成在刀架上的压电致动器以大约16.5 kHz的频率传递到刀尖,该压电致动器在径向和切向方向上的振幅分别为10μm和5μm,相位差为90°。通过考虑工具的刚体运动,再生和超声振动幅度对切屑厚度进行建模。在评估切屑再生和过程阻尼中的方向性因素时,应考虑工具在超声振动激发频率下与工件的接触损失。使用半离散时域方法解决了系统的稳定性问题,并在铣削Al-7050和AISI-1045钢中进行了实验验证。

更新日期:2019-12-19
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