Investigation of Chatter Vibration in End-Milling Process by Considering Coupled System Model

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Abstract:

Chatter vibration in cutting processes usually leads to surface finish degradation, tool damage, cutting noise, energy loss, etc. Self-excited vibration particularly seems to be a problem that is easily increased to large vibration. The regenerative effect is considered as one of the causes of chatter vibration. Although the chatter vibration occurs in various types of processing, the end-milling is a typical process that seems to cause the chatter vibration due to a lack of rigidity of one or more parts of the machine tools, cutting tool, and work-piece. The aim of our research is to propose a simple method to control chatter vibration of the end-milling process on the basis of a coupling model integrating the related various elements. In this study, hammering tests were carried out to measure the transfer function of a machine tool and cutting tool system, which seems to cause vibration. By comparing these results, finite elemental method (FEM) analysis models were constructed. Additionally, cutting experiments were carried out to confirm the chatter vibration frequencies in end-milling with a machining center. In the hammering tests, impulse hammer and multiple acceleration pick-ups are connected to a multi-channel FFT analyzer and estimate the natural frequencies and natural vibration modes. A simplified FEM model is proposed by circular section stepped beam elements on the basis of the hammering test results, considering a coupling effect. In comparisons of the calculated results and hammering test results, the vibration modes are in good agreement. As a result, the proposed model accurately predicts the chatter vibration considering several effects among the relating elements in end-milling. Moreover, it can be seen that the chatter vibration is investigated from a viewpoint of the integrating model of the end-milling process.

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201-208

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May 2014

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[1] Norikazu Suzuki, Chatter Vibration in Cutting Process, Journal of JSPE, Vol. 76, No. 3 (2010), pp.280-284, 404-408. (in Japanese).

Google Scholar

[2] Y. S. Chiou, E. S. Chung, S. Y. Liang, Analysis of Tool Wear Effect on Chatter Stability in Turning, Int. J. Mech. Sci., Vol. 37, No. 4 (1995), pp.391-404.

DOI: 10.1016/0020-7403(94)00070-z

Google Scholar

[3] Guillem Quintana, Joaquim Ciurana, Chatter in Machining Processes: A Review, International Journal of Machine Tools & Manufacture, Vol. 51(2011), pp.363-376.

DOI: 10.1016/j.ijmachtools.2011.01.001

Google Scholar

[4] Altintas, M. Eynial, H. Onozuka, Identification of Dynamic Cutting Force Coefficients and Chatter Stability with Process Damping, CIRP, Manufacturing Technology, Vol. 57 (2008), pp.371-374.

DOI: 10.1016/j.cirp.2008.03.048

Google Scholar

[5] Takuya Kojima, Norikazu Suzuki, Eiji Shiyamoto, New Design Method of Unequal Pitch Tool to Simultaneously Inhibit the Regeneration Effect of Multiple Mode, JSPE, (2010), pp.181-182. (in Japanese).

Google Scholar

[6] Y. Altintas, E. Budak, Analytical Prediction of Stability Lobes in Milling, Annals of the CIRP, Vol. 44, No. 1 (1995), pp.357-362.

DOI: 10.1016/s0007-8506(07)62342-7

Google Scholar

[7] Ivana Kovacic, The Chatter Vibrations in Metal Cutting - Theoretical Approach, Mechanical Engineering, Vol. 1, No. 5 (1998), pp.581-593.

Google Scholar