Design of a milling cutter with large length–diameter ratio based on embedded passive damper
Design of a milling cutter with large length–diameter ratio based on embedded passive damper
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DOI：
10.1177/1077546318786594
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发表时间：
2018-07
影响因子：
2.8
通讯作者：
Yiqing Yang;Yunfei Wang;Qiang Liu
中科院分区：
文献类型：
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作者：
Yiqing Yang;Yunfei Wang;Qiang Liu
大长径比铣刀是加工深腔、深孔结构件的必备刀具。然而，随着刀具悬伸量的增加，刀具容易发生颤振。采用单自由度被动式减振器，研制了一种减振铣刀。按照等峰值准则对嵌入式阻尼器进行了刚度和阻尼设计。实现了一种新的设计，以避免在高速旋转过程中的不平衡的刀具，和一个精确的实验调整的设计参数，需要达到最佳的振动抑制由于低质量比为2.5%。模态分析表明，长径比约为8的阻尼刀具在各向均能达到75%的减振效果，有利于抵抗随转角变化的铣削力激励。颤振稳定性仿真表明，阻尼刀具是能够提高稳定性极限的基础上评估的无阻尼和山特维克刀具。进行了三种配置的加工试验，最后通过加工音频信号和加工表面粗糙度对阻尼刀具的设计进行了验证。
A milling cutter with large length–diameter ratio has been essential in machining structural parts with deep cavity and deep hole features. However, chatter vibration is apt to occur with the increase of tool overhang. A damped milling cutter is developed by employing a single-degree-of-freedom passive damper located inside the arbor. The stiffness and damping design of the embedded damper are carried out by following the equal peaks criterion. A novel design is fulfilled to avoid the disequilibrium of the cutter during high-speed rotation, and an accurate experimental tuning of the design parameters is required to achieve the optimum vibration suppression due to a low mass ratio of 2.5%. Modal analysis demonstrates that the damped cutter with an approximate length–diameter ratio of 8 can reach 75% magnitude reduction at all orientations, which is benefical to resist milling force excitation varying with the rotation angle. Chatter stability simulation demonstrates that the damped cutter is able to increase the stability limits based on the evaluation of undamped and Sandvik cutters. Three configurations of machining tests are carried out and the design of the damped cutter is validated by the machining audio signals and machined surface roughness in the end.