Papers by Keyword: Ultrasonic Honing

Abstract: In order to achieve the local resonance of flexible-rod whetstone-seat vibration subsystem of the ultrasonic honing device, and using the analysis method of control theory, to regard the flexible-rod and whetstone-seat as the independent part in dynamics, their natural frequency and the vibration displacement function respectively are calculated by adopting the model of vibration with uniform section rod. Then the relationship between the natural frequency and the geometrical parameters of flexible-rod and whetstone-seat are established. The experiments shows that the computed result approximates the actual of flexible-rod whetstone-seat vibration system relatively. For the design of flexible-rod whetstone-seat vibration system with better vibration performance, it has the significant reference value.

Abstract: The tool’s unique movement trajectory in longitudinal and torsional ultrasonic machining technology can help chip extraction. Cutting liquid can offer good lubrication, cleaning and cooling. It also can prolong tool’s life, improve the processing quality and processing efficiency, so it is widely used in precision and ultra-precision machining. It builds the model of ultrasonic vibration system, based on the motion analysis of longitudinal and torsional ultrasonic vibration honing. In addition, mode analysis, transient dynamic analysis and harmonic response analysis are carried out by means of finite element analysis software ANSYS. Using graphics and curve in the postprocessing module describe the results of numerical simulation. It can provide powerful model and theoretical basis for the structure design and performance optimization of ultrasonic vibration system, which is used for longitudinal and torsional ultrasonic vibration honing.

Abstract: Based on VB, start from the performance requirements of ultrasonic honing for the amplitude transformer, and derive the amplitude transformer wave equation and boundary conditions. Then, establish a resonance frequency equation, programming iterating the critical size of the Amplitude transformer. To get the optimal solution, verified the results of optimal design by experiment. Experiments show that the optimal design is feasible, fast and accurate, possess of great practical value. It has played a prominent effect for further optimal design and processing applications of ultrasonic honing.

Abstract: The power ultrasonic vibration honing is one typical method with low speed grinding precision work. Compared with traditional honing, the ultrasonic vibration honing is of the advantages such as higher precision of surface quality, small roughness, higher processing efficiency, easy to process hard crisp material, etc. In the process of power ultrasonic vibration honing, with the increased ultrasonic surging force, the grinding force becomes extremely complex and changes along with the operating condition. Its flutter belongs to the nonlinear time-variable vibration, its flutter mechanism is more complex and the harm is more serious. In order to repress the chatter phenomenon, exploring the supersonic honing chatter mechanism through the research on the grinding force's tendency change rule. Through the analysis, draws the following conclusion: the radial component, which is caused by the added ultrasonic action on the oilstone, may be possible completely or partly to counteract the dynamic grinding force caused by the thickness effect; the axial componentmay be possible to remove the cross mark’s peak effectively of the ordinary honing and enhance the surface-supporting length ratio t_p without changing the roughness; the added ultrasonic influences mutual friction between oilstone and work piece in honing process.

Abstract: This article is a research about the transmission theory of ultrasonic honing device for "Bending Vibration Disc - Flexible Rod - Whetstone Base" subsystem ultrasonic vibration, and gives out an optimization program of the subsystem. It launches a modal analysis of the ultrasonic vibration honing subsystem by using kinetic analysis and element analysis, and gets the resonant frequency, mode vibration shape and node displacement for both optimized and traditional vibration sub-system. The modal vibration shape of the optimized subsystem is well consistent with the requirements of ultrasonic honing, which will greatly improve the processing capability and reliability of the ultrasonic honing device. The modal analysis results agree well with the theoretical analysis and the optimization program, which provided new ideas and methods for the further development of ultrasonic honing technology.

Abstract: Grinding chatter belongs to non-linear vibration, whose generation mechanism is complex. The eliminating and reducing of vibration are very difficult, which have been one of the hot and difficult problems at home and abroad. Power ultrasonic vibration honing is a special processing that adds secondary ultrasonic into traditional honing. Adding ultrasound not only superimposes high-frequency vibration components on the trajectories, which makes trajectories become very complex, but also makes high frequency ultrasonic vibration elements greatly influence the vibration trajectory of chatter, which makes the stability analysis of ultrasonic honing become more complex, so it is necessary to specially study in vibration trajectories of honing process. Taking axial ultrasonic vibration honing as an example, the paper respectively takes single wear debris, two adjacent wear debris, oilstone as study object to discuss on the variation rules of honing chatter vibration trajectory after adding ultrasonic, and obtains the following conclusions: adding ultrasonic can larger vibration trajectory for single wear debris or two adjacent wear debris on microscopic scales, on the view of macroscopic which is performed as honing depth of oilstone increasing; the effects of adding ultrasonic to chatter depend on the t value; through appropriately adjusting or selecting process parameters and structural ones, chatter can be completely avoided.

Abstract: This paper introduces the new technology of ultrasonic vibration honing, and analyzes the cutting principle of ultrasonic honing in terms of cutting motion, grain performance and cutting quantity. Then, the applied effect used in the cast-iron cylinder of DY90 is introduced. The principle and the structure of this device are discussed. This new technology can further be used in micro-car’s cylinder, can provides a high-productivity, high-quality for cast-iron cylinder.

Abstract: Experiments on surface features were carried out in honing zirconia engineering ceramics using fine grains. In ultrasonic honing, the surface fracture ratio increased quickly when the depth of cut is more than 3 μm, while in common honing it performed an ascending trend from depth of cut 1.5 μm. The value of surface roughness in ultrasonic honing increased along with the depth of cut; while it descends contrast to the depth of cut when the honing velocity is less than 0.58 m/s in traditional honing. As for honing velocity over 0.74 m/s, it deceased firstly to the minimal value for depth of cut 1μm, then began to ascend along with depth of cut. The value of surface roughness descended to minimum value for the range of honing velocity 0.41-0.58 m/s in traditional honing, while the optimized honing velocity ranged 0.58-0.75 m/s in ultrasonic machining. The surface roughness in ultrasonic honing was superior to that in traditional honing.