Our Projects

Experimental Investigation on CO2 Laser-Assisted Micro-Grinding ...

Fabricating micro-scale features in ceramic materials, such as alumina (Al 2 O 3 ), is challenging because of their high hardness and brittleness. Laser-assisted machining, in which a laser beam is a heat source for pre-softening the local area on a workpiece, is an effective hybrid method for machining ceramics. The study identified the effects of carbon dioxide (CO 2 ) laser-assisted micro ...

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Modeling and Evaluating of Surface Roughness Prediction in Micro ...

Iist is found that experimental results and the predicting roughness data have aroughness evident n coincidence, ... Finally, the characterization of micro-grinding tools which are used in the experiment has been done based on the distribution set. It is concluded that there is a significant coincidence between surface prediction data from the ...

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An Experimental Investigation of Surface Characterization for Zirconia ...

The experimental results reveal that the DC supply voltage and electrolyte concentration are the main governing factors in controlling the machining performance. The better material removal rate was identified at 65 V, 16 g/l electrolyte concentration, and 60-mm inter-electrode gap. FESEM images identified some of the micro-cracks on the ...

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Evaluation of the Performance of Multi-Component Cementitious ...

The interground systems are found to outperform the blended systems due to differential grinding of limestone. A novel approach to deduce the particle size distribution of limestone and cement in the interground systems is proposed. ... The design of these materials is accompanied by material characterization of cementitious binders ...

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Frontiers | Mueller Matrix Ellipsometric Characterization of Nanoscale ...

A nondestructive and effective characterization technique is essential for high quality products in the wafer manufacturing process. A method based on the Mueller Matrix Spectroscopic Ellipsometry (MMSE) is proposed to detect the nanoscale subsurface damage of 4H-SiC wafers induced by grinding and polishing.

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Effect of Grinding on Physico-Mechanical Properties of Ultra-Fine Micro ...

The effect of grinding for 5% micro-silica added concrete on compressive strength increased to 14, 30 and 29% for 4, 6 and 8 h duration, respectively. There is a reverse trend for 10% micro-silica added concrete in compressive strength and reduction of 14, 15 and 10% compared to unground micro-silica. For concrete with 15% added micro-silica ...

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Experimental study and theoretical analysis of the form grinding of ...

grinding using micro-crystal grinding wheels The experimental system for form grinding single tooth sur-faces using micro-crystal grinding wheels was established in the BV-75 vertical machining centre at the Beijing Research Institute of Mechanical and Electrical Technology, China, as shown in Fig. 4. A micro-crystal grindingwheel was fixed on

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Experimental Characterization of Nonlinear Dynamics Underlying the ...

This paper presents our characterization of dynamics underlying the cylindrical grinding of shafts using accelerometer signals gathered from a set of designed experiments. The results of our characterizations show that the dynamics, under steady state, evolves into a finite-dimensional, perhaps chaotic, attractor contaminated by noise, with fractal dimension values hovering between 3.1 and 3.8 ...

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Biological Micro Grinding Temperature Field under Nanoparticle Jet ...

3.1 Nanoparticle jet mist cooling micro grinding experimental platform. Figure 5 shows the established experimental platform of NJMC bio- micro grinding, including feed system, fixed system, ... Lei Z. Preparation and characterization of hollow Fe 3 O 4 /SiO 2 @ PEG-PLA nanoparticles for drug delivery. Composites Part B: Engineering ...

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Mechanical, electrical properties and impedance spectroscopy ...

The use of these materials is one of the potential ways to support sustainable development in both urban and rural areas. In the present article, we propose an experimental investigation on the use of a light-weight construction material, composed of rammed earth. The influence of the grinding on the mechanical and electrical properties is studied.

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Minimum Quantity Lubrication Grinding Using Nanofluids

ii ACKNOWLEDGEMENT First of all, I would like to thank my academic advisor, Prof. Albert J. Shih, for his guidance and help in my PhD program.

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Application of Ultra-Small Micro Grinding and Micro Milling Tools ...

Current demands for flexible, individual microstructures in high quality result in high requirements for micro tools. As the tool size defines the minimum structure size, ultra-small tools are needed. To achieve tool diameters of 50 µm and lower, we investigate the complete manufacturing chain of micro machining. From the development of the machine tools and components needed to produce and ...

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Micro | Free Full-Text | Experimental Characterization of Water ...

Micro. Volume 2. Issue 3. 10.3390/micro2030033. Submit to this Journal Review for this Journal Edit a Special Issue

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Experimental characterization of micro-drilling process using nanofluid ...

This paper discusses the experimental characterization of the micro-drilling process with the nanofluid minimum quantity lubrication (MQL). The miniaturized drilling machine tool system is...

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Research on the Drilling Performance of a Helical Point Micro Drill ...

Grinding Experiment of Helical Point Micro-Drills with Different Geometry Parameters. Based on the grinding process of the helical flank and drill flute presented by Zhang ... Romoli L., Rashed C.A.A., Fiaschi M. Experimental characterization of the inner surface in micro-drilling of spray holes: A comparison between ultrashort pulsed laser and ...

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A Micro Grinding Experimental Study on AISI 1020 Steel

This paper presents a micro-grinding experiment on AISI 1020 steel to study micro grinding principle. A novel micro shaft grinding tool is fabricated by cold sprayed with CBN grains, the manufacturing is carried out on a desktop micro machine developed by NEU. Influences caused by particle size on surface quality has been discussed, it has been tested that low surface roughness could be ...

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Effect of process parameters on material removal rate during grinding.

To investigate the parameters of grinding, In this experimental procedure 27 Nos. of experiments by combining most robust set of different four parameters each having three levels. ... vol.56, pp. 447-454. [21] Lee Pil Ho, Lee S.W. (2011),"Experimental characterization of micro-grinding process using compressed air", International ...

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Electrically driven mid-submicrometre pixelation of InGaN micro-light ...

Submicrometre-sized InGaN-based light-emitting diodes are fabricated by tailored ion implantation. The devices are free from electrical leakage and show a luminance of 7,440 nit at 4.9 A cm−2 ...

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XPS and SEM characterization of wheel/workpiece interface in grinding ...

An investigation is reported of the physical and chemical reactions at the wheel/workpiece interface during grinding of a nickel‐based superalloy K417. The temperature at the wheel/workpiece interface was measured using a workpiece-foil thermocouple and the forces were detected using a dynamometer. Scanning electron microscopy was used to examine deformations on ground workpiece surfaces ...

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Experimental characterization of superfinishing - S-H Chang, T N Farris ...

Abstract. An experimental study has been made of the superfinishing process. A force measurement system, developed for external cylindrical superfinishing, has been used to measure directly the forces acting on the abrasive stone. A systematic parametric study of material removal rate, force ratio, specific energy and surface finish is detailed.

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Experimental and numerical study of tooth finishing processes ...

Fig. 2. 3D micro-topographies (2 mm 2 mm) of tooth surfaces generated respectively (a) after hobbing, (b) after shaving, (c) after carbonitriding, (d) after shot peening (without hard finishing), (e) by power honing and (f) by grinding. The color scale is in millimeters. (For interpretation of the references to color in this figure legend, the

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Suhas Joshi - IIT Bombay

Mrinal Joshi, Ramesh K. Singh and Suhas S. Joshi; Experimental Characterization of Hydrodynamic Nanopolishing of Flat Steel Plates, Precision Engineering, v36, n3, (2012), ... Development and modeling of micro-electrochemical grinding (micro-ECG) process. M.Tech. 2007: 16: Jason Balou: Burr formation in Cross-holes in MADI alloy (At UIUC, USA ...

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A comprehensive review of micro-grinding: emphasis on toolings ...

A comprehensive review on micro-grinding tool manufacturing technologies, issues and controlling strategies, proper machining parameter selection, modeling techniques, and micro-feature generation in various materials is presented. Micro-grinding is a tool based mechanical micromachining process which is mostly applied to create and finish 3D micro-features on hard and brittle materials such ...

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Micro | Free Full-Text | Experimental Characterization of Water ...

Water condensation on solid surfaces is a universal phenomenon that plays an essential role in many interfacial phenomena, such as friction, corrosion, adsorption, etc. Thus far, the initial states of water condensation on surfaces with varying chemical properties have yet to be fully explained at the nanoscale. In this study, we performed a real-time characterization of water condensation on ...

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Experimental study on ductile-regime micro-grinding character of soda ...

The model for computing undeformed chip thickness in micro-grinding has been built considering tool topography, grit distribution and size effect in this paper. Micro-grinding experiments with different cutting depth on soda-lime glass have been designed and conducted. From experiment results, it was found that the edge crack length tends to have a wide range with different h m .

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Comparison Between Grinding and Lapping of Machined Part Surface ... - Core

Micro and Nano scale using two different devises was measured in two different directions normal and perpendicular to the machining direction. To show how suitable grinding and lapping is suitable in finishing parts in nano scale. 2.0 EXPERIMENTAL WORK A set of experiments were carried out to compare the measurement results

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Characterization of High-Speed Alumina Abrasive Grinding Wheel

The high-speed grinding wheel can be defined as a self-sharpening composite structural tool composed from abrasive grains held in a specific binder. The main properties of grinding wheels depend on the type of abrasive elements, grit size, grade, binder and the resulting structure, which is influenced by several crucial technological processing steps.

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Force Characterization of Micro Grinding in Zirconia

An ultra-precision lathe is used to carry out micro surface grinding experiments in zirconia. The experiments are performed to explore the feasibility of characterizing the depth of cut with respect to the measured normal force. A design of experiments is performed to see which parameters affect the force.

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Analytical and experimental investigations on the mechanisms of surface ...

The influence of maximum radial height grits on surface generation in micro grinding has been verified experimentally for up and down grinding modes. Microscopic observations of ground surfaces...

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Surface integrity characterization of austenitic, martensitic and ...

Zhou et al analyzed tensile micro residual stresses over austenitic phase and compressive micro residual stresses over ferrite phase of ground surface after grinding of 2304 duplex stainless steel. Recently, Zhou et al [ 12 ] studied the surface characterization of AISI 304L austenitic stainless steel under different abrasive grits size.

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Cortical grinding mechanism modeling and experimental studyfor ...

Dec 11, 2021The theoretical model of grinding force was established based on the calculation of specific energy and friction force. The grinding test platform was set up, and the full factorial experimental design was performed to link the grinding force evolution with different processing parameters.

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Formation of subsurface cracks in silicon wafers by grinding

When using a grinding wheel with a large mesh size, the depth of cut of each grain is large, which generally results in a poor grinding surface finish and deep damage. 33 33. Agarwal S, Rao PV. Experimental investigation of surface/subsurface damage formation and material removal mechanisms in SiC grinding. Int. J. Mach.

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Experimental study on ductile-regime micro-grinding character of soda ...

Micro-grinding experiments with different cutting depth on soda-lime glass have been designed and conducted. From experiment results, it was found that the edge crack length tends to have a wide...

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Grinding Burn Detection Based on Cross Wavelet and ... - SpringerOpen

Grinding burn is caused by excessive heat produced during grinding process. It changes the surface hardness and reduces the fatigue resistance which brings great damage to work-piece [1, 2].Grinding burn is widespread in the field of cylindrical grinding, rail grinding, bearing rings grinding, and so on [3,4,5].Therefore, the detection and monitoring of grinding burn is of great importance to ...

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Simulation-based evaluation of surface micro-cracks and fracture ...

Surface/subsurface crack during grinding limits the application of engineering ceramics. High-speed grinding is proposed in ceramics grinding for high material removal rate and surface quality. The dynamic fracture toughness of ceramic materials is established by combining the Johnson-Holmquist 2 damage model for brittle material and the Griffith fracture theory. Single-grit simulation was ...

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Materials | Free Full-Text | Experimental Study on Machining ...

The designed experimental setup was used for micro-groove fabrication and electrochemical discharge compound grinding of engineering ceramics. In order to obtain micro-grooves with good quality, experiments were developed, and the influences of key parameters, such as power voltage, power pulse frequency and rotation speed of the tool electrode ...

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A comprehensive review of micro-grinding: emphasis on toolings ...

In micro-surface grinding, tool is given some radial depth of cut on the workpiece side surface as well as axial depth of cut parallel to the side surface. Tool or workpiece is then fed in transverse direction generating a finished surface. Full diameter of the tool does not come in contact with the workpiece in case of micro-surface grinding.

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Experimental Study of Comparison of Surface Roughness in Grinding of ...

4. Zhao et al. [4] The study is about the grinding aptitude of as-sintered aggregated cubic boron nitride (ACBN) grains. Single-grain grinding tests of Ti-6Al-4V titanium alloy were done to find out wear of ACBN grains and the MRR values .Micro-structure of ACBN grains and scratch morphologies was also performed and the

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Experimental study and theoretical analysis of the form grinding of ...

The purpose of the research is to study the form grinding processes and properties of self-developed, new micro-crystal corundum grinding wheels. Aiming at this, this study conducted experimental research and theoretical analysis to form grinding 20CrMnTi steel tooth surfaces by using micro-crystal grinding wheels. The theoretical models and formulae for grinding forces of the form grinding of ...

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Experimental characterization on eco-friendly micro-grinding process of ...

Park Systems provides the widest range of atomic force microscopes and Bio SICM featuring one-click AFM imaging and True Non-Contact atomic force microscopy.

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