Adhesion Model and Shedding Limit's Identification of the Oxide Film on the Surface of ELID Grinding Wheel

2014 ◽  
Vol 900 ◽  
pp. 557-560 ◽  
Author(s):  
Ji Cai Kuai
Keyword(s):  
Oxide Film ◽  
Adhesion Strength ◽  
Grinding Force ◽  
Adhesion Property ◽  
Cemented Carbide ◽  
Grinding Wheel ◽  
Strength Model ◽  
Elid Grinding ◽  
Adhesion Model

The adhesion property of oxide film has great effects on the grinding quality and efficiency of ELID grinding. In this paper, adhesion strength model of oxide film is established, ELID grinding is conducted to nanometric cemented carbide and ordinary cemented carbide, ELID grinding force is measured, adhesive stress is calculated and the correctness of adhesion model is verified. The results show that the adhesion strength of oxide film is relatively greater, the transition from γ-Fe2O3to α-Fe2O3in the oxide film is relatively fuller and the polishing performance is relatively better while the grinding depth is smaller; with the deepening of grinding, the adhesion strength of oxide film reduces, the composition of the oxide film that transforms into α-Fe2O3is less and the polishing ability reduces. The adhesion model of oxide film well reflects the adhesion property of oxide film, and the application of this model can represent the distribution, shedding and updating of the oxide film on the surface of grinding wheel.

Forming Mechanism of Composite Abrasive Grains in Oxide Film on ELID Wheel and its Microstructure

2016 ◽  
Vol 709 ◽  
pp. 77-81 ◽  
Author(s):  
Ji Cai Kuai ◽  
Cheng Ran Jiang ◽  
Jiang Wei Wang
Keyword(s):  
Oxide Film ◽  
Grinding Wheel ◽  
Compound Structure ◽  
Wheel Surface ◽  
Forming Mechanism ◽  
Elid Grinding ◽  
Abrasive Grains ◽  
Shaped Crack

In this paper we analyze the forming mechanism of composite abrasive grains in oxide film on ELID grinding wheel surface, By using composition information and by taking advantage of microscale structure, we have investigated that abrasive grains surface is covered by a layer of oxide film and the fresh oxide film is loose and porous like turtle shaped crack when crushed and dried. The elements of oxide film consist of α-Fe2O3 with sphere grain of 5-50nm. This phenomena is demonstrated that the composite abrasive grains in oxide film is a compound structure which is centered by abrasive grains, with α-Fe2O3,Fe (OH)3 surrounded.

Experimental study on the characteristic and function of oxide film formed on grinding wheel in ELID precision grinding

2019 ◽  
Vol 72 (5) ◽  
pp. 549-555
Author(s):  
Jia-Bo Zhang ◽  
Yang Yang ◽  
Xiao-Hui Zhang ◽  
Jia-Liang Guan ◽  
Li-Yan Zheng ◽  
...  
Keyword(s):  
Oxide Film ◽  
Formation Rate ◽  
Combination Method ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
Content Type ◽  
Elid Grinding ◽  
Grinding Fluid ◽  
Film Forming ◽  
And Function

Purpose The purpose of this study is to investigate the characteristic and function of oxide film formed on grinding wheel in electrolytic in-process dressing (ELID) precision grinding and improve the quality of ELID grinding. Design/methodology/approach Dynamic film forming experiments were carried out with a simulation device close to the actual processing conditions. Then, the ELID grinding experiments of bearing rings were performed using grinding wheels with good film forming effect. The experiment was designed by quadratic regression general rotation combination method. The influence of grinding depth, electrolytic voltage, duty cycle and grinding wheel linear speed on grinding effect is analyzed. Findings A mathematical model for the formation rate of oxide film was established. The experiments show that the composition of grinding wheel and grinding fluid, as well as the electrical parameters, influence the film forming effect. Thus, the oxide film plays an important role in ELID grinding. Originality/value This study provides a reference for the design and selection of grinding wheel and grinding fluid and the setting of process parameters in ELID grinding.

Study on Grinding Force Distribution on Cup Type Electroplated Diamond Wheel in Face Grinding of Cemented Carbide

2014 ◽  
Vol 1017 ◽  
pp. 9-14 ◽  
Author(s):  
T. Fujiwara ◽  
Shinya Tsukamoto ◽  
Kazuhito Ohashi ◽  
Takashi Onishi
Keyword(s):  
High Performance ◽  
Outer Part ◽  
Diamond Wheel ◽  
Grinding Force ◽  
Cemented Carbide ◽  
Grinding Wheel ◽  
Force Distribution ◽  
Force Variation ◽  
Face Grinding ◽  
Peak Value

In order to establish a high performance grinding method of cemented carbide, the grinding force distribution on the working surface of the cup type electroplated diamond grinding wheel is experimentally analyzed with the grinding force variation of face grinding, which is carried out on the narrow workpiece. The grinding force distribution is obtained by the successive difference of the grinding force variation. The grinding state becomes steady as soon as beginning of the interference of grinding wheel in workpiece, because the edge profile of workpiece is formed as same as the envelope of the grinding wheel. Main conclusions obtained in this study are as follows. In the region of the front edge of the grinding wheel, relatively large grinding force occurs, then in the region of the rear edge of the grinding wheel, the grinding force becomes smaller. In the left right-side end of the wheel, the grinding forces are larger than the center of the wheel. It is made clear that the grinding force distribution shows the peak value near the outer part of the wheel, and the peak value is larger in the center part of the wheel, on the contrary, the peak width become broad in both the left and right-side end of the wheel.

Friction Coefficient of Nano-Ceramic Polished by Oxide Film on ELID Grinding Wheel

2013 ◽  
Vol 669 ◽  
pp. 91-94 ◽  
Author(s):  
Ji Cai Kuai
Keyword(s):  
Friction Coefficient ◽  
Oxide Film ◽  
Normal Force ◽  
Tangential Force ◽  
Grinding Wheel ◽  
Nano Materials ◽  
Dynamic Changes ◽  
Bonding Agents ◽  
Elid Grinding ◽  
Feeding Speed

The dynamic changes of the friction properties of the oxide film are characterized by the dynamic changes of the ELID grinding force. The tangential force and normal force are used to represent the friction coefficient in order to obtain the accurate real-time friction coefficient of oxide film. Therefore, the friction coefficient of various grinding wheels with different bonding agents, various grinding parameters, various grinding materials (nano- Al2O3 ceramic, nano ZrO2 ceramic and ordinary ZrO2 ceramic), and ELID grinding and ordinary grinding can be further studied. The results show that: the friction coefficient of the oxide film on the bronze-based grinding wheel is greater than that composed by iron; the friction coefficient of the oxide film decreases with the increase in grinding depth and feeding speed; the friction coefficient of the oxide film and nano-materials is smaller than that of the oxide film and ordinary materials; the transformation from γ-Fe2O3 to α-Fe2O3 in oxide film and the elastic deformation of the oxide film caused by the high-temperature of grinding may make the friction coefficient of ELID grinding greater than that of ordinary grinding, so the oxide film contains better property of friction and polishing. Therefore, excellent surface quality is easier to be obtained by it compared with the ordinary grinding technology.

Discovery of α-Fe2O3 in the Oxide Film on ELID Grinding Wheel

2014 ◽  
Vol 1061-1062 ◽  
pp. 446-449 ◽  
Author(s):  
Ji Cai Kuai
Keyword(s):  
Oxide Film ◽  
Experimental Verification ◽  
Theoretical Study ◽  
Electrochemical Process ◽  
Grinding Wheel ◽  
Transformation Mechanism ◽  
X Ray ◽  
Elid Grinding

This paper conducted a theoretical study on the generation and transformation mechanism of α-Fe2O3in the oxide film and an experimental verification of the presence of it. Firstly, the electrochemical process of the generation and transformation of α-Fe2O3in the oxide film was analyzed, followed by the measurement of the content of it in the oxide film using X-ray diffractometer.

A Study on the Mechanism of the Electrolytic In-Process Dressing (ELID) Grinding Using Molecular Dynamics (MD) & Finite Element (FE)

2007 ◽  
Vol 329 ◽  
pp. 123-130 ◽  
Author(s):  
Cheng Zu Ren ◽  
X.J. Guo ◽  
Li Wei Yuan
Keyword(s):  
Molecular Dynamics ◽  
Finite Element ◽  
Simulation Model ◽  
Md Simulation ◽  
Grinding Force ◽  
Fe Analysis ◽  
Grinding Wheel ◽  
Analysis Model ◽  
Passivation Film ◽  
Elid Grinding

In the paper, the Molecular Dynamics (MD) simulation model and the Finite Element (FE) analysis model were combined together to study the mechanism of the Electrolytic In-process Dressing (ELID) grinding. A 3-D MD simulation model for grinding monocrystalline silicon was established to acquire grinding force and its change laws, and an interpolation multinomial of grinding force was established on the basis of MD simulation result. A FE model for abrasives and the passivation film was established to calculate displacement of abrasives in the passivation film. The grinding force and abrasives displacement were iterated between MD simulation model and FE analysis model to obtain the displacement variation of the abrasives in the passivation film. The simulation result shows that, the uniform height of the abrasives in the contour of the grinding wheel is improved owing to the existence of passivation film in ELID grinding, it is related to the thickness of the passivation film, and processing quality in ELID grinding could be enhanced through controlling of thickness of the passivation film.

Manufacturing Technology of α-Fe Bonded Grinding Wheel Free Abrasive

2018 ◽  
Vol 780 ◽  
pp. 111-115 ◽  
Author(s):  
Ji Cai Kuai ◽  
Dmitrii V. Ardashev ◽  
Jia Qi Zhang ◽  
Hua Li Zhang
Keyword(s):  
Oxide Film ◽  
High Surface ◽  
Grinding Wheel ◽  
Mirror Surface ◽  
Precision Grinding ◽  
Abrasive Particles ◽  
Elid Grinding ◽  
Abrasive Grain ◽  
Ultra Precision ◽  
Free Abrasive

ELID ultra-precision grinding mirror surface can achieve nanometer precision. However, after the grinding wheel passivates the abrasive particles in electrolysis, it is easy to scratch the ultra-precision ELID grinding surface into the grinding process. In order to solve this problem, a non-abrasive grain α-Fe bonded grinding wheel is propose, which contains no abrasive particles. After electrolysis, oxide film is formed on the surface of the wheel. In ultra-precision ELID grinding, there is no abrasive particles involved, only the polishing effect of oxide film. There is no need to worry about the scratching of exfoliated abrasive particles that have been machined on ultra-precision ELID surfaces. Thus achieving extremely high surface accuracy.

Study of α-Fe2O3 formation and its measurement in oxide films of wheel surface during ELID grinding process

2017 ◽  
Vol 31 (04) ◽  
pp. 1750025 ◽  
Author(s):  
Jicai Kuai ◽  
Dmitrii V. Ardashev ◽  
Huali Zhang
Keyword(s):  
Oxide Film ◽  
Spectrum Analysis ◽  
Ir Spectrum ◽  
Oxide Films ◽  
Grinding Wheel ◽  
Vibration Band ◽  
Wheel Surface ◽  
Characteristic Absorption Band ◽  
Forming Mechanism ◽  
Elid Grinding

This paper presents the study of forming mechanism of [Formula: see text]-Fe2O3 in oxide films on electrolytic in-process dressing (ELID) grinding wheel surface. To investigate the component content and the microtopography of oxide films, XRD, XPS, IR spectrum analysis, SEM, and TEM measurements are performed on ELID grinding wheels. In XRD test results, the characteristic absorption band of [Formula: see text]-Fe2O3 is found in the oxide film. XPS tests show that there is full of ferrous iron and oxygen element in the oxide film. Also, the characteristic spectral line of XPS is identical to the standard spectrum of [Formula: see text]-Fe2O3. Several vibration peaks (471, 1029, 1384, 1630, 3430) are observed by IR spectrum analysis. It can be easily seen by contrast with the standard photographs that the vibration peak of 1029 is of Fe-O vibration band in IR spectrum of [Formula: see text]-Fe2O3 powder. Therefore, these measurement results confirm the existence of [Formula: see text]-Fe2O3 in the oxide films, and explain the polishing effect of oxide films during ELID grinding. The fresh oxide film is porous and moisture rich. However, the oxide film after squeezing to dry is investigated by SEM imaging to present tortoiseshell cracks. Geometrically, [Formula: see text]-Fe2O3 appears to be nearly spherical with particle size around 5–50 nm. This indicates fine polishing improvement by oxide films, and is identified as the mechanism responsible for excellent surface quality by ELID grinding.

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