Papers by Keyword: Elliptical Vibration

Paper TitlePage

Authors: Shao Hui Yin, Zhi Qiang Xu, Jian Wu Yu, Ze Biao Wang
Abstract: The basic principles of ultrasonic transducer and ultrasonic elliptical vibration polishing are investigated. A new kind of single-incentive ultrasonic transducer is designed, and the finite element simulation is conducted, a polishing device is developed based on the ultrasonic elliptical vibration. The polishing experiment is adopted to polish a tungsten carbide mold with the diameter 5cm. The experimental result shows that the tungsten carbide mould surface roughness changes from the original 0.026μm to 0.017μm.
140
Authors: Feng Jiao, Feng Bian Li, Peng Duan
Abstract: Based on the application of elliptical vibration cutting method to precision machining of hard and brittle materials and material softening technology through laser heating, a novel composite cutting technique, laser heating and ultrasonic elliptical vibration assisted cutting, is applied to process sintered tungsten carbide. The simulation of the orthogonal cutting process and the effect of frequency and amplitude of vibration and laser heating temperature on cutting force are discussed by using FEA method. Research results have revealed that the main peak of the transient force components increase with the increase of vibration frequency, decrease with the increase of vibration amplitude and laser heating temperature. Moreover, the friction reversal phenomenon is improved with the increase of vibration frequency and amplitude, resulting in the decrease of average cutting force. Compared to common cutting and traditional one-dimensional ultrasonic vibration cutting, the composite cutting technology put forward in this paper has unique cutting force characteristics for such super hard material because of combined action of friction reversal and intermittence cutting for ultrasonic elliptical vibration and material softening for laser heating. The research in the paper has provided a practical reference for the further experiments of laser and ultrasonic assisted cutting.
272
Authors: Quan Cai Wang, Nan Fang He, Guo Fu Gao, Bo Zhao
Abstract: In this paper, topography feature of the diamond grinding wheel under the diamond stylus elliptical ultrasonic vibration assisted dressing was studied experimentally. The results indicate that: the increase in dressing power of elliptical ultrasonic vibration will result in the increase in amplitude, and that can increase abrasive protrusion height of the dressing grinding wheel, and also increase the depth of chip pocket. With the increase of feed rate, surface peak and valley values of elliptical ultrasonic vibration dressing grinding wheel increase, that is the average protrusion height of abrasive grain increases. With the increase of dressing depth, surface peak and valley values of elliptical ultrasonic vibration dressing grinding wheel increases, while the number of static effective abrasive grain reduces. In comparison with the ordinary dressing grinding wheel, elliptical ultrasonic assisted dressing in the same parameters can bring about more static effective abrasive grain , more uniform abrasive distribution, a higher abrasive protrusion height and more chip space.
126
Authors: Bo Zhao, C.Y. Zhao, G.F. Gao
Abstract: In this paper, on the influence of different dressing methods, such as elliptical ultrasonic vibration, on the grinding wheel bonded delta, the morphology of abrasive grains of wheel, the protrusion height and the grinding wheel topography was studied by experiment. The experiment shows that the abrasive grains of grinding wheel surface dressed by elliptical ultrasonic vibration are great in protrusion height and trench depth, and the bonded delta grain after grinding is narrow, short, and irregular with significant reduced semi-surrounded area compared with by ordinary dressing method. The abrasive grains of metal-bonded diamond grinding wheel surface dressed by elliptical ultrasonic vibration are basically intact, and due to the high-speed collision between abrasive grains, local micro-break is easy to occur on the abrasive grains to form multiple micro-cutting edges. The abrasive grains of grinding wheel surface dressed by ordinary dressing method are fractured and broken, while that of resin-bonded grinding wheel surface have a high ratio to be loose and shedding. For the metal or resin-bonded grinding wheel surface dressed by elliptical ultrasonic vibration, its material removal mechanism may primarily be the removal of bonding ductility and the fine-crushing of abrasive grains; for the metal-bonded grinding wheel surface dressed by ordinary method, its material removal mechanism may primarily be the fracture and break of abrasive grains, secondly be the fracture of bonding agent; and for the resin-bonded grinding wheel surface, its material removal mechanism may mainly be the looseness and shedding of abrasive grains caused by the fracture of bonding agent, secondly be the fracture of abrasive grains. Compared with ordinary dressing method, elliptical ultrasonic vibration dressed abrasive grains are dense at shaft and sparse in periphery, with a large quantity of static effective abrasive grains, great protrusion height and an excellent nature of contour.
330
Authors: Zhen Yin, Hua Li, Zi Yang Cao, Ou Xie, Yan Li
Abstract: A new ultrasonic elliptic vibrator design method was proposed, the ultrasonic elliptic vibration was achieved by the structural curve of the longitudinal and torsional vibrations. The model, harmonic and transient analyses of the new longitudinal-torsional composite ultrasonic elliptical vibrator were performed by using the software ANSYS, the prototype of the new vibrator was tested by using impedance analyzer and PSV-400 laser Doppler vibrometer, the correctness of the finite element simulation results and the feasibility of the new longitudinal-torsional composite ultrasonic elliptical vibrator design methods were verified.
79
Authors: Zhen Yin, Hua Li, Bang Fu Wang, Ke Feng Song
Abstract: Based on FEM, a new type of ultrasonic elliptic vibrator design method was proposed, the ultrasonic elliptic vibration was achieved by the structural curve of the longitudinal and torsional vibrations. The impedance and vibration characteristics of the new longitudinal-torsional composite ultrasonic elliptic vibrator prototype were tested. It provides an important basis for impedance matching and longitudinal-torsional composite ultrasonic elliptical vibration application.
341
Showing 1 to 6 of 6 Paper Titles