scholarly journals Cavitation Effect in Ultrasonic-Assisted Electrolytic In-Process Dressing Grinding of Nanocomposite Ceramics

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5611
Author(s):  
Guangxi Li ◽  
Fan Chen ◽  
Wenbo Bie ◽  
Bo Zhao ◽  
Zongxia Fu ◽  
...  
Keyword(s):  
Ultrasonic Cavitation ◽  
Grinding Wheel ◽  
Workpiece Surface ◽  
Elid Grinding ◽  
Cavitation Effect ◽  
Ultrasonic Assisted ◽  
Hard And Brittle Materials ◽  
Cavitation Threshold ◽  
Grain Distribution ◽  
Experimental Substantiation

Ultrasonic-assisted electrolytic in-process dressing (UA-ELID) grinding is a promising technology that uses a metal-bonded diamond grinding wheel to achieve a mirror surface finish on hard and brittle materials. In this paper, the UA-ELID grinding was applied to nanocomposite ceramic for investigating the cavitation effect on the processing performance. Firstly, the ultrasonic cavitation theory was utilized to define the cavitation threshold, collapse of cavitation bubbles, and variation of their radii. Next, the online monitoring system was designed to observe the ultrasonic cavitation under different ultrasonic amplitude for the actual UA-ELID grinding test. A strong effect of ultrasonic cavitation on the grinding wheel surface and the formed oxide film was experimentally proved. Besides, under the action of ultrasonic vibration, the dressing effect of the grinding wheel was improved, and the sharpness of grain increased by 43.2%, and the grain distribution was dramatically changed with the increase of ultrasonic amplitude. Compared with the conventional ELID (C-ELID) grinding, the average protrusion height increased by 14.2%, while the average grain spacing dropped by 21.2%. The UA-ELID grinding reduced the workpiece surface roughness Rz and Ra by 54.2% and 46.5%, respectively, and increased the surface residual compressive stress by 44.5%. The surface morphology observation revealed a change in the material removal mechanism and improvement of the surface quality by ultrasonic cavitation effect. These findings are considered instrumental in theoretical and experimental substantiation of the optimal UA-ELID grinding parameters for the processing of nanocomposite ceramics.

Study on Electrolysis Performance of Bamboo Charcoal Bonded Grinding Wheel

2010 ◽  
Vol 135 ◽  
pp. 447-451
Author(s):  
Wei Li ◽  
Jian Wu ◽  
Bao Gong Geng
Keyword(s):  
Smooth Surface ◽  
Phenolic Resin ◽  
Xrd Analysis ◽  
Surface Generation ◽  
Grinding Wheel ◽  
Bamboo Charcoal ◽  
Sintering Process ◽  
Elid Grinding ◽  
Environmental Friendly ◽  
Hard And Brittle Materials

Electrolytic in-process dressing (ELID) Grinding was an effective machining method for gaining of super smooth surface for hard and brittle materials due to its excellent surface generation capabilities. Bamboo charcoal bonded (BCB) grinding wheel was an environmental friendly ELID grinding wheel which was made up of bamboo charcoal and phenolic resin as bonding agent with high temperature sintering process. In this paper, the electrolysis performances of the BCB grinding wheel with the different resin ratios were researched, and the surface of BCB grinding wheel formed a dense oxide layer in electrolysis action, was illustrated with SEM and XRD analysis.

A Study of a New ELID Grinding Fluid by BP Neural Network Model

2011 ◽  
Vol 58-60 ◽  
pp. 1792-1796
Author(s):  
Wei Li ◽  
Yu Jie Fan
Keyword(s):  
Neural Network ◽  
Bp Neural Network ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
Elid Grinding ◽  
Environmental Friendly ◽  
Grinding Fluid ◽  
Hard And Brittle Materials ◽  
Ultra Precision ◽  
Bp Neural Network Model

Electronic in-process dressing (ELID) grinding will be a main technology of ultra-precision grinding which has been widely adopted to the ultra-precision and high effectively machining of hard and brittle materials. This study puts forward a new environmental friendly bamboo charcoal bonded (BCB) grinding wheel and develops a new ELID grinding fluid. An oxide layer is mostly determined by the electric performance of grinding fluid in the experiment. This paper founds a model to forecast grinding fluid’s electric performance by BP neural network and MATLAB. This method can be used in developing of ELID grinding machining fluid to improve the ELID grinding effect.

A Review of Electrolytic In-Process Dressing (ELID) Grinding

2009 ◽  
Vol 404 ◽  
pp. 45-59 ◽  
Author(s):  
Mustafizur Rahman ◽  
A. Senthil Kumar ◽  
I. Biswas
Keyword(s):  
Crystalline Silicon ◽  
Surface Damage ◽  
Anodic Oxide ◽  
Ceramic Materials ◽  
Grinding Wheel ◽  
Elid Grinding ◽  
Mathematical Explanations ◽  
Bk7 Glass ◽  
Hard And Brittle Materials ◽  
Conventional Grinding

ELID Grinding, since its introduction over two decades ago, has helped in material removal of hard and difficult-to-cut engineering materials. A gist of the important research milestones on the process has been organized in this report. The hybrid process of ELID Grinding has a simultaneous electrolytic reaction and grinding action. Electrolysis takes place between the conductive anodic wheel and highly conductive cathode in presence of a special electrolyte. The resulting anodic oxide wears off easily to allow efficient grinding. The different parameters involved in electrolysis complicate the mechanism of grinding and makes it significantly different from conventional grinding. Different variants of the process have also been reported, though the basic philosophy of operation is the same as basic ELID. Several authors have also suggested mathematical explanations, among other fundamental studies, that provide further insight. The basic components of the process, machine tool, power supply, grinding wheel, electrode and electrolytes, have also undergone several modifications and developments to deliver better results and suit specific purposes. The process has been successfully applied in stock removal operations for hard and brittle ceramic materials with low grinding forces compared to conventional grinding. Fine finishing of almost all kinds of hard and brittle materials, ranging from hardened steels, BK7 glass, mono-crystalline silicon, silicon carbide, aluminum nitride, silicon nitride etc, has been successfully carried out, to provide high quality surfaces with low sub-surface damage. Finally, discussions on the different stages of evolution of the process have been put forward as a conclusion to the report.

Study on Grinding Mechanism of BCB Grinding Wheel

2012 ◽  
Vol 472-475 ◽  
pp. 2914-2917 ◽  
Author(s):  
Wei Li ◽  
Yang Hong ◽  
Liang Sheng Jin
Keyword(s):  
Surface Roughness ◽  
Removal Rate ◽  
Resin Composite ◽  
Grinding Wheel ◽  
Machining Parameters ◽  
Bamboo Charcoal ◽  
Workpiece Surface ◽  
Elid Grinding ◽  
Grinding Mechanism ◽  
Grinding Technique

BCB(Bamboo Charcoal Bonded) grinding wheel is a new kind of grinding wheel developed by bamboo charcoal-phenolic resin composite for ELID(Electrolysis In-process Dressing) grinding technique. To study the affection of the ground workpiece surface roughness and removal rate with this new kind of grinding technique, the stainless steel SUS304 was ground using BCB grinding wheel in different machining parameters with ELID grinding condition, and the machining characteristics of BCB grinding wheel has been researched. The experimental results indicated that the ground workpiece surface roughness can be reached to Ra 0.010μm, and the efficient and precision machining with BCB grinding wheel by ELID grinding technique has been achieved for hard-to-cut materials. Finally, by studying of the grinding wheel surface condition and wear, the BCB grinding wheel grinding mechanism has been preliminary discussed.

Surface Topography of Mini-Size Diamond Wheel in Ultrasonic Assisted Grinding (UAG)

2014 ◽  
Vol 8 (4) ◽  
pp. 569-575 ◽  
Author(s):  
Masakazu Fujimoto ◽  
◽  
Yongbo Wu ◽  
Mitsuyoshi Nomura ◽  
Hidenari Kanai ◽  
...  
Keyword(s):  
Surface Topography ◽  
Diamond Wheel ◽  
Grinding Wheel ◽  
3D Analysis ◽  
Grinding Forces ◽  
Wheel Surface ◽  
Workpiece Surface ◽  
Topographic Features ◽  
Ultrasonic Assisted Grinding ◽  
Ultrasonic Assisted

The objectives of this paper are to describe a quantitative evaluation of mini-size diamond grinding wheel surface topography in Ultrasonic Assisted Grinding (UAG) process and demonstrate the effects of topography on grinding characteristics. In this study, threedimensional (3D) analysis of the wheel working surface was observed using a Scanning Electron Microscope (SEM) with four electron probes (hereafter described as 3D-SEM) in an on-surface UAG process. These results indicated that a good wheel surface maintained in the UAG process is related to the number and the area of cutting edges. Additionally, the resulting topographic features of the grinding wheel surface are closely related to low grinding forces and allow easy manufacturing of a mirror workpiece surface.

Study on Ultrasonic Cavitation Mechanism of Honing

2011 ◽  
Vol 189-193 ◽  
pp. 4149-4153 ◽  
Author(s):  
Guo Dong Liu ◽  
Xi Jing Zhu
Keyword(s):  
Nonlinear Dynamics ◽  
Theoretical Basis ◽  
Acoustic Pressure ◽  
Physical Phenomenon ◽  
Ultrasonic Cavitation ◽  
Precision Machining ◽  
Workpiece Surface ◽  
Cavitation Effect ◽  
Ultra Precision ◽  
The Impact

Ultrasonic cavitation is an extremely complex physical phenomenon. It displays a series of nonlinear dynamics as the bubbles oscillating, growth, shrinkage and even collapse. For ultrasonic honing, it causes the device to generate chatter and noise because of the cavitation effect, and even generates denudation on the workpiece surface. In this paper, it describes the cavitation mechanism in ultrasonic honing, and analysises the acoustic pressure of the formation of cavitation from the numerical, furthermore it experimentally demonstrated. It also analyzes the nonlinear oscillation of cavitation bubbles for the impact on the ultrasonic honing chatter. Through studying on ultrasonic cavitation mechanism of honing, it provided a theoretical basis to solution the problem of the ultrasonic honing chatter and improves the level of precision and ultra precision machining.

Modeling and Simulation of the Surface Topography Generation With Engineered Grinding Wheel

2020 ◽  
pp. 381-403
Keyword(s):  
Surface Topography ◽  
High Surface ◽  
Kinematic Model ◽  
Grinding Wheel ◽  
Feed Speed ◽  
Profile Curve ◽  
Workpiece Surface ◽  
High Surface Quality ◽  
Engineered Grinding Wheel ◽  
Grain Distribution

Precision grinding can obtain workpiece with high surface quality and high precision, but random distribution of abrasive grains on the grinding wheel surface poses a certain difficulty to improvement of machining precision and quality. This study established kinematic model of multiple grains, simulated the grain distribution on the surface of the common grinding wheel by using the grain vibration method, and examined the effect of different grinding parameters on the surface topography of the workpiece. Results show that the peaks and valleys on the profile curve of the workpiece surface increase and the corresponding Ra and Rz heights decrease, as the peripheral velocity of the grinding wheel increases. The peaks and valleys on the profile curve of the workpiece surface decrease, and the corresponding Ra and Rz heights increase as the feed speed of the workpiece increases. The number of grinding cracks on the surface of the workpiece decreases, the length of each crack increases, and the bump height on the surface increases slightly as the grinding depth increases.

Modeling and Simulation of Surface Topography in Single Abrasive Grain Grinding

2020 ◽  
pp. 358-380
Keyword(s):  
Surface Topography ◽  
Simulation Method ◽  
Grinding Wheel ◽  
Deformation Model ◽  
Feed Speed ◽  
Profile Curve ◽  
Workpiece Surface ◽  
Grinding Parameters ◽  
Grain Distribution ◽  
Surface Increase

This study establishes a kinematics model, elastic deformation model, and plastic accumulation model of a single grinding wheel, simulates the grain distribution on the surface of the common grinding wheel by using the grain vibration method, and examines the effect of different grinding parameters on the surface topography of the workpiece. Results show that the peaks and valleys on the profile curve of the workpiece surface increase, and the corresponding Ra and Rz heights decrease, as the peripheral velocity of the grinding wheel increases. The peaks and valleys on the profile curve of the workpiece surface decrease, and the corresponding Ra and Rz heights increase as the feed speed of the workpiece increases. Experiments are conducted to verify the simulation results. The results show that the simulation method can predict the surface roughness of the workpiece, which is a factor in selecting the grinding parameters.

Research on Diamond Wheel’s Specialties during ELID Ulterprecision Grinding of Silicon Nitride

2011 ◽  
Vol 295-297 ◽  
pp. 51-55
Author(s):  
Wei Dong Jin
Keyword(s):  
Silicon Nitride ◽  
Surface Profile ◽  
Grinding Wheel ◽  
Cutting Depth ◽  
Insulator Layer ◽  
Silicon Nitride Ceramic ◽  
Workpiece Surface ◽  
Abrasive Grain ◽  
Materials Research ◽  
Hard And Brittle Materials

Taking ultraprecision grinding of silicon nitride ceramic as an example, this paper mostly introduces some influences of diamond wheel’s specialties on the grinding process and surface quality during ELID (electrolytic in-process dressing) grinding of hard and brittle materials. Research indicates that grain size and concentration of abrasive material should be reasonably selected based on the surface roughness. And Inhomogeneity of concentration distribution along wheel circumference will result in heterogeneity of insulator layer state, which will bring difference in the number of abrasive grain in the grinding area, thereby changing the actual cutting depth of every abrasive grain. Dynamic balancing of grinding wheel should be accurately adopted to reduce eccentric mass, furtherly to avoid generating waveness on the workpiece surface. For the purpose of reflecting rightly compositive effect from eccentricity of wheel shape, roundness of the wheel and periodical vibration derived from eccentric mass, actual radial runout of grinding wheel should be well and truly measured and controlled based on the wheel’s surface profile during wheel is rotating at working speed.

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