Center Track Analysis and Simulation Considering Effect of Vortex and Perturbation of Cutting Fluid on BTA Boring Bar

Abstract:

In order to reveal the motion center track of boring bar during heavy-duty deep-hole boring trepanning processing, a new model is proposed considering both linear item and cubic item to describe nonlinear factors of the bars stiffness. The study mainly investigates two factors: vortex instability caused by outside cutting fluid, and perturbation instability caused by inside cutting fluid of the boring bar. Vibration amplitude of the bar changes with the nonlinear stiffness coefficient while the bar works at the same rotation speed. The results of numerical calculation and simulation are obtained, when the processing parameters match the combinative operation parameters under the different motion status. It shows the bar interaction with external cutting fluid while it is subjected to unbalanced force. These behaviors will induce self-exited vibration of bar, meanwhile the center track will be a closed curve loop. Boring bars vibration is always in a certain vibration amplitude. The maximum vibration amplitude is near the region of ω/2 and 2ω in the x direction.

• Periodical: Applied Mechanics and Materials (Volume 526)
• Pages: 150-154
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.526.150
• Online since: February 2014
• Authors: Wu Zhao, De Jie Chen, Zhan Qi Hu
• Keywords: BTA Deep-Hole Boring, Center Track, Perturbation, Vortex

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