Detection of Self-Excited Chatter Caused by Mode Coupling. 1st Report. Study on Criterion of Detection.

英二, 近藤; 秀穂, 田中; 紀雄, 皮籠石

doi:10.1299/kikaic.64.3661

Cited by 2 publications

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“…Regenerative chatter (Tlusty andPolacek, 1963, Tobias, 1965) and mode coupling (Ota, et al, 2007, Kondo, et al, 1998, Zhang, et al, 2012, Suzuki, et al, 2009) are known as factors of self excited chatter vibration. In this research, chatter suppression performance is assumed to be evaluated by the maximum negative real part value of the compliance by average tooth angle approach (Tlusty, 1985) in order to establish the optimal design method for a damped tool arbor.…”

Section: mentioning

confidence: 99%

Analysis of vibration behavior of damped tool arbor by finite element method

Onozuka

Utsumi

Kono

et al. 2014

JAMDSM

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To improve cutting performance and suppress chatter vibration during machining of large mechanical parts with a long slender cutting tool, a design method was investigated for a tuned mass damper imbedded tool arbor. To clarify the effects of the dynamic stiffness and damping ratio of the weight which is supported at both ends inside the hollow space of the arbor on the dynamic compliance at the end of the arbor, finite element analysis was conducted. First, since the weight has twisting vibration in its 2nd order natural mode, it is necessary to consider 2 degrees of freedom of the motion to optimize the damper. Then, the relationship between the motion of the damper and damping performance is clarified in accordance with the change in spring constant of the weight. From the results, an area exists where there is little change in the maximum negative real part of the compliance due to the change in spring constant. Designing the spring constant in this area stabilizes the damping performance. Furthermore, comparison of the results of finite element analysis and the conventional particle model analysis revealed that the results of finite element analysis show a smaller real part of the compliance than those of particle model analysis. This is because the inertial forces of the weight are applied not to the end of the arbor but to the tool holder side of the arbor and the damping effect is smaller than that in the particle model.

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Section: mentioning

confidence: 99%

Analysis of vibration behavior of damped tool arbor by finite element method

Onozuka

Utsumi

Kono

et al. 2014

JAMDSM

View full text Add to dashboard Cite

show abstract

“…However, the conditions for maximizing the chatter free depth of cut are different from the conditions for minimizing φ max . As factors of self excited chatter vibration, regenerative chatter (12,13) and mode coupling (14)(15)(16)(17) are known. In this research, chatter suppression performance is assumed to be evaluated by maximum negative real part value of the compliance by average tooth angle approach (18) in order to establish the optimal design method of damped tool arbor.…”

Section: Arbor Arbormentioning

confidence: 99%

Optimal Design of a Damped Arbor for Heavy-Duty Machining of Giant Parts

Onozuka

Utsumi

Kato

et al. 2013

JAMDSM

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Aiming to suppress chatter vibration during machining of huge mechanical parts, dies, and molds, a design method for a damped arbor imbedded with a mass damper was devised. First, an analysis method coupled with Rayleigh's method was developed and used to calculate the stiffness of an arbor with a tapered hollow space for installing the mass damper inside. In the formulation of the vibrating system with two degrees of freedom, the displacement ratio is introduced for accurate calculation of the counter force of the damper mass. Then, the shape and size of the hollow space was optimized in order to maximize the negative real part of the compliance of the arbor. The proposed design method can increase the dynamic stiffness of the damped arbor with a hollow with the minimum reduction in its static stiffness. Furthermore, it is found that once the damper is optimized for the maximum length of an arbor in a certain design range, it can be applied to a shorter arbor without deterioration of dynamic stiffness. Finally, chatter noise and machined surface roughness measured experimentally proved that a damped arbor prototyped by the proposed design method has much higher cutting performance than a conventional one.

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Detection of Self-Excited Chatter Caused by Mode Coupling. 1st Report. Study on Criterion of Detection.

Cited by 2 publications

References 0 publications

Analysis of vibration behavior of damped tool arbor by finite element method

Analysis of vibration behavior of damped tool arbor by finite element method

Optimal Design of a Damped Arbor for Heavy-Duty Machining of Giant Parts

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