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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2014, Vol. 35 ›› Issue (9): 2652-2659.doi: 10.7527/S1000-6893.2013.0484

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Boring Bar with Constrained Damping

XIA Feng, LIU Zhanqiang, SONG Qinghua   

  1. Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China
  • Received:2013-10-22 Revised:2013-12-03 Online:2014-09-25 Published:2013-12-10
  • Supported by:

    National Natural Science Foundation of China (U1201245,51375272);Major Science and Technology Program of High-end CNC Machine Tools and Basic Manufacturing Equipment (2012ZX04003-041)

Abstract:

Cutting chatter is a key factor which influences the quality and accuracy in machining. In order to improve the machining quality of holes, a novel boring bar with constrained damping is designed and manufactured. It is made up of four modules, the cutting head, substrate layer, damping layer and constraining layer. First, the damping performance of the boring bar is effectively improved through increasing the natural frequency, static stiffness and damping ratio for cutting stability. Secondly, ANSYS is used to calculate the impact factor of the material substrate layer thicknesses for damping performance. The optimized damping boring bar is obtained by parameters optimization. The results show that both the natural frequency and the damping ratio for the damping boring bar are higher than those for a traditional boring bar. It is also shown that the amplitude of the optimized damping boring bar has decreased 34% than that of the traditional boring bar at the same exciting frequence. Finally, the damping performance of the designed boring bar is validated by practical cutting experiments. Experimental results show that the surface roughness of the damping boring bar is 50% lower than that of the traditional boring bar for the same cutting conditions and the same ratio of length to diameter (L/D=6). It demonstrates that the constrained damping boring bar has better anti vibration performance.

Key words: damping boring bar, parameter optimization, finite element, cutting stability, surface roughness

CLC Number: