Design of a composite viscous damper and application on cylindrical thin-walled part milling

Abstract

Chatter vibration is apt to occur when machining thin-walled parts with insufficient rigidity. The harmful excitation of periodical cutting forces can be mitigated by enhancing the dynamic stiffness or increasing the damping of the part. A composite viscous damper including air damping and eddy current damping is designed, which can be attached on the thin-walled part by the vacuum. Based on the formulations of air damping and eddy current damping, the optimal equivalent viscous damping is derived for achieving the maximum critical depth of cut. Furthermore, the geometries of the damper are determined for damping a specific thin-walled part after investigating its relationship with viscous damping. The modal test indicates that the damper can suppress multiple modes of the cylindrical thin-walled part, and the amplitude of the first mode of the frequency response function (FRF) is reduced by 57%. The composite viscous damper is applied to suppress the chatter and resonant vibration of the thin-walled part during machining. Milling tests demonstrate that the machining vibration is reduced by 55% and 76% after employing single damper and four dampers, respectively.

Design and application of composite lanchester damper for milling thin-walled part

“…When the stiffness of the VA is neglected, it is transformed into the Lanchester damper, and the vibration energy can be dissipated to mitigate vibration [4] . It can be divided into friction damping, impact damping, and viscous damping.…”

Study on The Stability and Experimental Study of Non-uniform Allowance Chattering of Thin-Walled Parts Based on ɛ Influence Factor

“…These thin-walled parts of the use of scene have very high requirements for accuracy, and in the manufacture of these thin-walled parts, it is straightforward to produce chatter, which will not only affect the quality of parts processing and will damage the machine tool and cutting tools, which invariably increases the cost of manufacturing. For this reason scholars in related fields start with prediction [1,2], detection [3] and suppression methods [4], while the suppression methods start from machining machine tool spindle [5,6], tools [7,8] and fixtures [9,10] to improve the suppression ability of machining chatter. However, in terms of investment in equipment, it is more efficient to control the margin division of thin-walled parts to improve machining accuracy.…”