Ultrasonic Vibration Grinding Test of Composite Ceramics Based on the Nonlocal Theory

2010 ◽  
Vol 126-128 ◽  
pp. 139-142
Author(s):  
Bo Zhao ◽  
Ping Xie ◽  
Chong Yang Zhao
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Nonlocal Theory ◽  
Grinding Force ◽  
Ultrasonic Frequency ◽  
Composite Ceramics ◽  
Nano Composite ◽  
Better Than

The effects of ultrasonic frequency on the grinding force and surface quality were analyzed from the grinding experiment on ZTA nano-composite ceramics. The results indicate that, in the same parameters, ultrasonic normal grinding force is about 65 to 85 percents of the ordinary grinding condition, and the surface quality is better than that of ordinary grinding condition, as the frequency increasing, this trend will be more evident. The reasons for it were also discussed from microscopic and the nonlocal theory in this paper.

Effects of Ultrasonic Frequencies on Grinding Force of Nano-Composite Ceramics Based on Nonlocal Theory

2012 ◽  
Vol 565 ◽  
pp. 148-153
Author(s):  
Bo Zhao ◽  
Ping Yan Bian ◽  
Yu Li
Keyword(s):  
Experimental Study ◽  
Surface Morphology ◽  
Ultrasonic Vibration ◽  
Vibration Frequency ◽  
Material Properties ◽  
Nonlocal Theory ◽  
Grinding Force ◽  
Composite Ceramics ◽  
Nano Composite ◽  
Ductile Mode

Based on nonlocal theory, The effects of ultrasonic frequencies on the grinding force and nonlocal decay rate are obtained through the experimental study of material properties under ultrasonic vibration grinding test. The results of experiments showed that grinding force is attenuated in the ultrasonic vibration frequency ranges and this attenuation phenomenon becomes more and more evident by the increase of the ultrasonic frequencies. Through analysis of the grinding surface morphology and phase structure, it showed that ultrasonic vibration greatly reduces the average grinding force, and the surface quality are improved, and that it is much easier to achieve ductile-mode machining under ultrasonic vibration. The results of experiments are in accordance with the analysis of nonlocal theory.

Research on the Effects of Ultrasonic Frequencies on the Grinding Surface Quality of Nano-Composite Ceramics

2010 ◽  
Vol 154-155 ◽  
pp. 1680-1683
Author(s):  
Hui Ma ◽  
Bo Zhao
Keyword(s):  
Phase Transition ◽  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Abrasive Particle ◽  
Ultrasonic Frequency ◽  
Particle Removal ◽  
Composite Ceramics ◽  
Nano Composite ◽  
Ultrasonic Grinding

The effects of multiple ultrasonic frequencies on grinding surface quality of Al2O3-ZrO2 nano-composite ceramics are researched to provide optimization laws for ultrasonic grinding parameters. Some SEM photographs of ultrasonic grinding surface with different frequencies are provided to research the surface quality. The enhanced surface quality of ceramics with ultrasonic grinding is explained as the transition of single abrasive particle removal mode from brittle to ductile, which is resulted from the reduction of equivalent rigidity on surface under ultrasonic vibration. And this phenomenon becomes more evident as frequency increases. Through the XRD experiment, the phase transition from tetragonal phase t-ZrO2 to monoclinic phase m-ZrO2 becomes increasingly obvious by the action of ultrasonic vibration. The compressive stress generated during this phase transition can suppress the initiation and expansion of microcracks on the processing surface. The research shows that, the grinding surface quality with ultrasonic vibration is superior to that without ultrasonic vibration, and increasing ultrasonic frequency can contribute to the improvement of the surface quality.

scholarly journals Study on Effect of Ultrasonic Vibration on Grinding Force and Surface Quality in Ultrasonic Assisted Micro End Grinding of Silica Glass

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Zhang Jianhua ◽  
Zhao Yan ◽  
Zhang Shuo ◽  
Tian Fuqiang ◽  
Guo Lanshen ◽  
...  
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Silica Glass ◽  
Removal Rate ◽  
Surface Characteristics ◽  
Diamond Wheel ◽  
Grinding Force ◽  
Grinding Forces ◽  
Grinding Parameters ◽  
Ductile Machining

Ultrasonic vibration assisted micro end grinding (UAMEG) is a promising processing method for micro parts made of hard and brittle materials. First, the influence of ultrasonic assistance on the mechanism of this processing technology is theoretically analyzed. Then, in order to reveal the effects of ultrasonic vibration and grinding parameters on grinding forces and surface quality, contrast grinding tests of silica glass with and without ultrasonic assistance using micro radial electroplated diamond wheel are conducted. The grinding forces are measured using a three-component dynamometer. The surface characteristics are detected using the scanning electron microscope. The experiment results demonstrate that grinding forces are significantly reduced by introducing ultrasonic vibration into conventional micro end grinding (CMEG) of silica glass; ultrasonic assistance causes inhibiting effect on variation percentages of tangential grinding force with grinding parameters; ductile machining is easier to be achieved and surface quality is obviously improved due to ultrasonic assistance in UAMEG. Therefore, larger grinding depth and feed rate adopted in UAMEG can lead to the improvement of removal rate and machining efficiency compared with CMEG.

scholarly journals Effect of laser-assisted ultrasonic vibration dressing parameters of a cubic boron nitride grinding wheel on grinding force, surface quality, and particle morphology

2021 ◽  
Vol 60 (1) ◽  
pp. 691-701
Author(s):  
Zhibo Yang ◽  
Wang Sun ◽  
Dongyu He ◽  
Daocheng Han ◽  
Wei Wang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Process Parameters ◽  
Cubic Boron Nitride ◽  
Grinding Force ◽  
Grinding Wheel ◽  
Abrasive Particles ◽  
Dressing Force ◽  
Cbn Grinding Wheel

Abstract In this article, the laser-assisted ultrasonic vibration dressing technique was applied to the cubic boron nitride (CBN) grinding wheel to study the effect of various process parameters (namely, laser power, dressing depth, feed rate, and grinding wheel speed) on the grinding force, surface quality, and morphological evolution of CBN abrasive particles. The results showed that abrasive particles’ morphology mainly undergoes micro-crushing, local crushing, large-area crushing, macro-crushing, and other morphological changes. The dressing force can be effectively reduced by controlling the dressing process parameters. Besides, grinding tests are performed on the grinding wheel after dressing to reveal specimens’ surface quality. Excellent grinding characteristics and grinding quality of the grinding wheel were obtained by the proposed technique with the optimized process parameters.

scholarly journals On the Grinding Performance of Alumina Wheels in Ultrasonic Vibration-Assisted Grinding of Hardened GCr15 Steel

2021 ◽  
Author(s):  
Yutong Qiu ◽  
Biao Zhao ◽  
Yang Cao ◽  
Wenfeng Ding ◽  
Yucan Fu ◽  
...  
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Grinding Force ◽  
Grinding Wheel ◽  
Wear Property ◽  
Wheel Wear ◽  
Machined Surface ◽  
Gcr15 Steel ◽  
Abrasive Grains ◽  
Ultrasonic Vibration Assisted Grinding

Abstract Composite manufacturing with multiple energy fields is an important source of processing technology innovation. In this work, comparative experiments on the conventional grinding (CG) and ultrasonic vibration-assisted grinding (UVAG) of hardened GCr15 steel were conducted with WA wheel. The grinding wheel wear patterns and chips were characterized. In addition, grinding force, force ratio, and ground surface quality were investigated to evaluate wheel performance. Results illustrate that the interaction between abrasive grains and workpiece in UVAG process has the characteristics of high frequency and discontinuity. The wear property of abrasive grains is changed and the grinding force is decreased because the generation of micro-fracture in abrasive grains improves the grinding wheel self-sharpening. Better surface quality is obtained, the surface roughness is reduced by up to 18.96%, and the number of defects on the machined surface is reduced through the superior reciprocating ironing of UVAG. Accordingly, WA wheel performance is improved by UVAG.

Investigation on Machining Characteristics for Tangential Ultrasonic Vibration Assisted Grinding

2010 ◽  
Vol 34-35 ◽  
pp. 282-286
Author(s):  
Wei Feng Lang ◽  
Hong Li Zhang
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Critical Speed ◽  
Grinding Force ◽  
Machining Parameters ◽  
Theory Analysis ◽  
Kinematic Characteristics ◽  
Ultrasonic Vibration Assisted Grinding ◽  
Machining Characteristics ◽  
Good Agreement

A critical speed formula was given based on the analysis of kinematic characteristics during tangential ultrasonic vibration assisted grinding (TUAG) process. By the formula, the machining parameters can be correctly set to insure the separate characteristics of TUAG process. The grinding force can be decreased and the machining surface quality can be improved during TUAG process with separability. Grinding experiments were conducted, and the experiment results are in good agreement with theory analysis results.

Research on Micro Characteristics of Surface and Subsurface Layer in Two-Dimensional Ultrasonic Grinding Nano-Composite Ceramics

2008 ◽  
Vol 375-376 ◽  
pp. 395-400 ◽  
Author(s):  
Bo Zhao ◽  
Guo Fu Gao ◽  
Yan Wu ◽  
Feng Jiao
Keyword(s):  
Ultrasonic Vibration ◽  
Fracture Behavior ◽  
Lattice Distortion ◽  
Ground Surface ◽  
Nano Materials ◽  
Two Dimensional ◽  
Composite Ceramics ◽  
Nano Composite ◽  
Ultrasonic Grinding ◽  
Deformation Layer

This work mainly studied the deterioration layer structure, crystal grain size, crystal lattice distortion of ground surface in two-dimensional ultrasonic vibration grinding nano-composite ceramics. The research indicated that under a certain grinding condition the ductile deformation layer on the ground surface of nano-composite ceramics in two-dimensional ultrasonic vibration grinding is formed by the ways of material powdering, crystal grain fragmentation, materials extrusion, the crystal grain pull-off and so on. The transition layer between the surface layer and the base body is plastic deformation layer by the primarily ways of crystal lattice distortion and the crystal boundary slipping. The removed material in brittleness fracture mode is extremely few. In this work, the structural model of deterioration layer on ground surface in two-dimensional ultrasonic grinding nano-composite ceramics is put forward. The microscopic deformation mechanism of nano materials is inner grain dislocation of inner-grain-structure strengthened phase. Its deformation coordination mechanism is the the grain-boundary sliding of matrix grain and the coordinated deformation of intercrystalline second-phase. The TEM and SEM observation discovers that the nano particles dispersed in grain boundary stops crack from expanding in nano materials, which causes the materials to appear in transcrystalline fracture behavior. And this fracture behavior gives materials favorable finished surface. The plastic deformation is the dominant removal mechanism of the nano materials in two-dimensional ultrasonic vibration grinding.

Prohibition Effects on the Crack Propagation of Al2O3-ZrO2 Nano-Composite Ceramics under Ultrasonic Vibration

2010 ◽  
Vol 426-427 ◽  
pp. 147-150
Author(s):  
Hui Ma ◽  
Bo Zhao
Keyword(s):  
Fatigue Life ◽  
Crack Initiation ◽  
Crack Propagation ◽  
Ultrasonic Vibration ◽  
Load Level ◽  
Composite Ceramics ◽  
Crack Initiation And Propagation ◽  
Nano Composite ◽  
Initiation And Propagation ◽  
Low Load

This paper presents a research on the effects of ultrasonic frequencies of 19.9 kHz, 23.6 kHz and 29.3 kHz on both of cyclic amplitude and fatigue life of Al2O3-ZrO2 nano-composite ceramics. According to the high-cyclic-life tests at low load level, some prohibition influence on the process of crack initiation and propagation under ultrasonic vibration is revealed as frequencies are raised from 19.9 kHz to 29.3 kHz. During the low load level tests, the toughness increment induced by the transcrystalline fracture is found in the scanning electronic micrographs of the fractures, which shows the existence of the inhibition effect on the crack initiation and propagation. At the same time, the fracture XRD indicates that t-m phase transition of ZrO2 under 29.3 kHz is higher than that under 19.9 kHz, which means that both the required cyclic amplitude and the fatigue life can be improved if the ultrasonic frequency is increased to 23.6 kHz. All the test results show that high frequencies exhibit stronger toughening improvements than the lower ones do. This paper is a pre-research for the ultrasonic ceramic grinding and the conclusions obtained are meaningful for the study of the crack propagation mechanism during the grinding.

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