Abstract
The vibration assisted polishing has widely application fields because of higher machining frequency and better polishing quality, especially the polishing with the non-resonant mode that is regarded as a kind of promising polishing method. This paper reports a novel vibration assisted polishing device, consisting of the flexible hinge mechanism driven by the piezoelectric actuators, which is suitable for polishing planes or curve surfaces with slow curvature. Firstly, the generation methods of vibration trajectory are investigated for the same frequency and different frequency signals’ inputs, respectively, and then the types of elliptic and Lissajous’s vibration trajectories are generated respectively. Secondly, a flexural mechanism consisting of the right circular flexible hinges and the leaf springs is developed to produce two-dimensional vibration trajectory. Statics and dynamics investigating of this flexible mechanism are finished in detail. The analytical models about input and output compliances of the flexural mechanism are established according to the matrix-based compliance modeling, and the dynamic model of the flexural mechanism based on the Euler-Lagrange equation is also presented. The finite element model of the flexural mechanism was established to carry out the numerical simulation in order to testify the rationality of device design. Finally, the polishing experiment is carried out to prove the effectiveness of the vibration device. The experimental results show that this novel vibration assisted polishing device developed in this study can remove more effectively the cutting marks left by last process and obviously reduce the workpiece surface roughness.
Highlights
Polishing is an important finishing process and widely used as a final processing operation, among which vibration assisted polishing, a kind of promising finishing process, has been applied in various fields, such as the difficult-to-cut materials and complex surface parts
The results have shown that ultrasonic vibration can raise Preston coefficients significantly, indicating that vibration-assisted polishing can increase material removal rate considerably
In order to verify the input compliance obtained by the matrix-based compliance modeling (MCM) method, Finite element analysis (FEA) mode of the flexural mechanism is established, and external forces (80N) along x-axis and y-axis are applied to the input point OA of HDU-R module in CR4 (point O) marked in Fig. 15, respectively, in order to obtain the corresponding input compliance with the FEA method, as shown
Summary
Polishing is an important finishing process and widely used as a final processing operation, among which vibration assisted polishing, a kind of promising finishing process, has been applied in various fields, such as the difficult-to-cut materials and complex surface parts. The non-resonant mode: Guo et al developed a novel magnetostrictive vibration-assisted polishing system in order to improve the efficiency and stability of micro-optical mold polishing. This vibrating polisher was fixed on a 5-axis controlled table via a balancing adjustment mechanism and can vibrate in a lateral motion at frequency of 9.2KHz with amplitude of 30μm.. Chee et al developed a novel polishing system for micro molds which consists of 2DLFV with PZTs incorporated into the mechanical transformer structure, a low contact force loader, and a polishing tool. The polishing tool can produce different frequency vibrations when this flexural mechanism is driven by the piezoelectric actuators
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