What is it about?

Boring bar is widely used in deep hole machining. Due to the low stiffness of long cantilever boring bar, vibration often occurs in boring process. Vibration suppression can permit higher productivity and better surface finishes. In order to improve the performance of boring operations, a variable stiffness Dynamic Vibration Absorber(DVA) is added inside the boring bar to reduce vibration.

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Why is it important?

The stiffness of the DVA is provided by two rubber bushes placed inside the DVA. By changing the axial compression, the stiffness of the DVA can be adjusted to accommodate different excitation frequencies. By establishing the relationship between the stiffness of the DVA and the axial compression of the rubber bush, we can always find the optimal stiffness for different excitation frequencies and make the boring bar work in a stable state. The boring experiment is conduct and the results show that by selecting reasonable axial compression, the vibration of the boring bar can be effectively suppressed.

Perspectives

Writing this article was a great pleasure as it has co-authors with whom I have had long standing collaborations.

Lie Li

Read the Original

This page is a summary of: Analysis of the Vibration Characteristics of a Boring Bar with a Variable Stiffness Dynamic Vibration Absorber, Shock and Vibration, August 2019, Hindawi Publishing Corporation, DOI: 10.1155/2019/5284194.
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