二維振動拋光裝置的研究
[Abstract]:Both advanced manufacturing and the completion of high-end equipment products require surface polishing technology. In high-tech fields such as mobile phone communications, automobile manufacturing, aerospace and navigation, the surface quality of microstructural components plays an important role in the completion of major tasks for the equipment. How to improve the surface quality of micro-nano structure of important components has become a key technical problem that needs to be solved urgently. The existing surface polishing techniques, such as ultrasonic elliptical vibration polishing, air bag polishing and laser polishing, are mature, but the device design is complex. In this paper, the elliptical vibration is innovatively applied to the polishing of workpiece surface, which is different from ultrasonic elliptic vibration. In this paper, the piezoelectric stack is used to drive the polishing grinding head directly through the flexure hinge, and the sinusoidal signal is applied to the orthonormal stacked piezoelectric stack. This signal has a certain phase difference, which drives the polishing head to finish the elliptical polishing motion. On the one hand, elliptical vibration polishing can effectively improve the surface quality of the workpiece, on the other hand, it can effectively improve the polishing efficiency by increasing the polishing frequency. In this paper, two kinds of elliptical vibration polishing devices are designed: two dimensional elliptical vibration polishing device and three dimensional elliptical vibration polishing device. Two kinds of hinge structures are designed and statically analyzed by ANSYS software, modal analysis is carried out to avoid coupling phenomenon and resonance phenomenon. A two-dimensional elliptical vibration polishing device was fabricated. The experiments on the surface polishing of aluminum alloy and brass proved that the elliptical vibration polishing device can effectively reduce the surface roughness of the polished workpiece. The main contents of this paper are as follows: firstly, the elliptical vibration polishing device is designed. The device directly uses the piezoelectric stack driven polishing head to polishing with ultra-precision machine tools, which makes the polishing process more concise. The surface of the polished workpiece is smoother. The theory of elliptical vibration polishing is analyzed, including the principle of elliptical motion, the structure analysis of flexure hinge and the research of piezoelectric stack driving method. Two polishing devices are designed. The two-dimensional elliptical vibration polishing device is also tried to be machined. Secondly, the performance of 2-D elliptical vibration polishing device is tested by using microsense II5300 capacitive displacement sensor, piezoelectric stack, power amplifier PMAC-motion control card, Siemens industrial control computer and push-pull dynamometer, etc., using Newport RS4000 air floatation vibration isolator, micro sense II5300 capacitive displacement sensor, piezoelectric stack, power amplifier, PMAC motion control card, and push-pull dynamometer, etc. The laboratory noise, the stiffness of the device and the natural frequency of the device are tested, and the reliability of the device design is verified. Finally, three kinds of workpieces, aluminum, brass and red copper, are polished by using a two-dimensional elliptical vibration polishing device. It is proved that the two-dimensional elliptical vibration polishing can reduce the surface roughness of the workpiece by testing the surface quality of the workpiece. A comparative polishing experiment was carried out with two polishing heads of different materials (wool and rubber). Under the same polishing conditions, the surface roughness of the workpiece thrown by the wool grinding head was lower than that of the other. It is verified that the material of polishing grinding head also has certain influence on the roughness of workpiece surface.
【學位授予單位】:吉林大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TG580.2
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