Reducing Wear of Abrasive Wheels Grinding Aerospace Alloys by Laser Assisted Cleaning

2005 ◽  
Author(s):  
Mark J. Jackson ◽  
Xun Chen
Keyword(s):  
Laser Power ◽  
Laser Cleaning ◽  
Grinding Wheel ◽  
Cleaning Process ◽  
Grinding Wheels ◽  
Wheel Surface ◽  
Power Flux ◽  
Aerospace Alloys ◽  
High Laser ◽  
Selection Of

A new method for cleaning loaded grinding wheels is introduced by applying a CO2 laser pulse to the wheel surface. It is shown that effective cleaning can be achieved by the selection of adequate laser power flux and irradiation duration. Fusion and evaporation of clogged chips play an important role in the laser cleaning process and subsequent wear of the grinding wheel. It is suggested that high laser power irradiance of short duration is essential for effective wheel cleaning and reduced wear of the grinding wheel with specially developed bonds.

Experimental Study on Porous Metal Bonded Diamond Grinding Wheels - The Selection of Porosity Inducers and Agglomeration’s Parameter

2011 ◽  
Vol 415-417 ◽  
pp. 594-597 ◽  
Author(s):  
Hua Xu ◽  
Cui Jiao Liao ◽  
Qing Ming Weng
Keyword(s):  
Experimental Study ◽  
Porous Metal ◽  
The Self ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Porosity Structure ◽  
Diamond Grinding Wheel ◽  
Diamond Grinding ◽  
Selection Of

To improve the self-sharpening ability and increase clearance for debris of metal bonded diamond grinding wheel, the porosity structure is applied to the diamond grinding wheel in this paper. By selecting different inducers diamond composites are burned under appropriate agglomeration condition. The experiment results indicate that diamond composites obtained through two certain inducers can meet both the demand of pore-creating and intensity, so can be used to make wheels. This conclusion lays a foundation for further study.

Grinding Wheel Loading Evaluation Using Digital Image Processing

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Hamed Adibi ◽  
S. M. Rezaei ◽  
Ahmed A. D. Sarhan
Keyword(s):  
Image Processing ◽  
Digital Image Processing ◽  
Digital Image ◽  
Cutting Parameters ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Wheel Surface ◽  
Metal Chips ◽  
Wheel Loading ◽  
Expensive Process

Wheel loading entails chip accumulation in porosities between grains or welding to the top of cutting grains. It is considered one of the most prevalent problems in grinding Nickel-based super alloys. Identification of wheel loading is an important issue for optimizing the dressing intervals, but it can be a time consuming and an expensive process. A novel technique based on digital image processing to determine the loading areas over the surface of CBN vitrified grinding wheels using the toolbox of MATLAB is presented in this paper. The optical characteristics of the metal chips, the abrasive grains and wheel bond are considered. Experiments were performed to examine the repeatability of the proposed technique. The results were verified by the use of a scanning electron microscope. Based on the proposed technique, the effects of cutting parameters on the loaded area to wheel surface ratio in relation to grinding performance were studied empirically.

scholarly journals Methods for modeling the active surface of grinding wheels

Mechanik ◽  
2018 ◽  
Vol 91 (10) ◽  
pp. 907-914 ◽  
Author(s):  
Wojciech Kacalak ◽  
Filip Szafraniec ◽  
Dariusz Lipiński
Keyword(s):  
Probability Density Function ◽  
Probability Density ◽  
Density Function ◽  
Active Surface ◽  
Grinding Wheel ◽  
Real Surface ◽  
Grinding Wheels ◽  
Wheel Surface ◽  
The Real

This paper many different methods of generating the topography of the grinding wheel surface and the methodology for assessing the compatibility of models with the surface of real tools was presented. The methodology was indicated that certain features regarding the shape and position of the highest vertices are decisive for assessing the model’s conformity with the real surface of the grinding wheel. The significance of not only the form of the distribution of the vertices of the grains was emphasized, but also the significance of the fragment of the probability density function relating to the highest vertices and the autocorrelation of the vertex position as the most important feature, which often are overlooked in the models described in the literature.

Optimizing the Dry Grinding Process on the Basis of Bond Materials

2014 ◽  
Vol 1017 ◽  
pp. 237-242
Author(s):  
Heike Kitzig ◽  
Nima Jandaghi ◽  
Bahman Azarhoushang ◽  
Alireza Vesali
Keyword(s):  
Surface Roughness ◽  
Process Efficiency ◽  
Grinding Wheel ◽  
Formation Mechanisms ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Wet Grinding ◽  
Dry Grinding ◽  
Conventional Grinding ◽  
Selection Of

In order to decrease the negative environmental impacts of the cutting fluids (for example, disposal of grinding sludge) and also to reduce the manufacturing costs and the required space for the machines the dry grinding can be a conceivable alternative for the conventional grinding processes. Nevertheless, dry grinding has not been widely introduced into industry because of the high temperature generated in the grinding zone and difficulties of heat transfer without coolants. Selection of the proper grinding wheel bonds, grit sizes and concentration has significant effect on the grinding performance and the generated heat in the contact zone. This paper addresses the effects of the grinding wheel bond and the concentration on the dry grinding process efficiency through comparing the results of the carried out experiments with three resin bonded cBN-cup-wheels, each consisting different bond components. For this purpose, surface roughness and thermal damages during dry and wet grinding (utilizing grinding oil) by three different resin bonds were measured. The results show almost identical surface roughness values for dry and wet grinding. Furthermore, using the resin-kryolith-graphite bonded wheel leads to a reduction in thermal damages on the workpiece. Through different experiments, it was shown that the different bonds, used in this study, have significant influence on the chip loading of the grinding wheels. This is contributed to the different chip formation mechanisms and induced grinding temperatures when grinding by the different wheel bonds.

Feasibility Study on Near-Dry Electrical Discharge Dressing of Metal Bonded Diamond Grinding Wheels

2009 ◽  
Author(s):  
Y. Jia ◽  
C. J. Wei ◽  
B. S. Kim ◽  
D. J. Hu ◽  
J. Ni
Keyword(s):  
Electrical Discharge ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Wheel Surface ◽  
Rotating Speed ◽  
Diamond Grinding ◽  
Electrode Shape ◽  
Experimental Parameters ◽  
Discharge Parameters ◽  
Electrical Discharge Dressing

Diamond grinding wheels are important tools to carry out precise or ultra-precise grinding of difficult-to-machine materials; however, the difficulty of dressing diamond grinding wheels is a bottleneck problem in their wide application. The objective of this study is to identify the feasibility of near-dry electrical discharge dressing (EDD) of metal bonded diamond grinding wheels. Through design of experiment (DoE), sets of tests were carried out to select proper dielectric mist composition and electrode material, to quantify the dielectric mist composition, to choose the electrode shape and rotating speed, and to investigate the influence of electric discharge parameters on dressing performance. By applying optimized experimental parameters to near-dry EDD of metal bonded diamond grinding wheels, more diamond grits protruded out of the grinding wheel surface, and the worn diamond grinding wheel got sharpened.

Development of In-Process Monitoring System for Grinding Wheel Surface Temperature and Grinding State

2016 ◽  
Vol 1136 ◽  
pp. 624-629 ◽  
Author(s):  
Yoshiya Fukuhara ◽  
Shuhei Suzuki ◽  
Hiroyuki Sasahara
Keyword(s):  
Surface Temperature ◽  
High Hardness ◽  
Grinding Wheel ◽  
Measured Temperature ◽  
Grinding Wheels ◽  
Wheel Surface ◽  
Wireless Transmitter ◽  
Process System ◽  
State Changes ◽  
Tool Shank

Grinding is a machining technology for plane surfaces and cylindrical surfaces in general. In comparison with cutting, higher accuracy can be provided and it is easier to manufacture high-hardness materials using grinding. However, the grinding wheel surface state changes during grinding, and grazing, clogging and shedding may then lead to problems. As these problems degrade the accuracy and productivity of grinding and the surface integrity of the work material, it is important to select an appropriate grinding condition to avoid the problems. In this study, a novel in-process system for monitoring the grinding wheel surface temperature and grinding state in real time, was proposed. A thermocouple is embedded in the grinding wheel in the developed system. The measured temperature data are transmitted to the external terminal equipment by a wireless transmitter built into the tool shank. Grinding wheel surface temperature was measured on four kinds of grinding wheels using the developed system. As a result, the grinding wheel surface temperature was measured successfully. In addition, it was clarified that the temperature transition largely depends on the grinding state.

scholarly journals Modeling And Simulation of The Advanced Structured Surfaces Machined By Specially Patterned Grinding Wheels Via The Structuring Grinding Process

2021 ◽  
Author(s):  
Amr Monier ◽  
Bing Guo ◽  
Qingliang Zhao ◽  
T.S. Mahmoud
Keyword(s):  
Working Conditions ◽  
Simulation Method ◽  
Grinding Wheel ◽  
Operating Parameters ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Wheel Surface ◽  
Structured Surfaces ◽  
Structured Surface ◽  
Irregular Geometries

Abstract In this work, the ability to reshape the grinding wheels with special patterns to produce advanced structured surfaces with several geometries is studied. Firstly, a mathematical model is built for the process relating geometries of the grinding wheel, geometries of wheel patterns, the produced structured surface with the grinding operating parameters. Then, different regular and irregular geometries are designed to be patterned over the wheel surface. Afterward, a simulation method to express the patterned wheels and the structured surface at different working conditions is developed. The effects of the pattern geometries on the obtained structured surfaces are investigated.

Investigations on Laser Dressing of Grinding Wheels—Part I: Preliminary Study

1989 ◽  
Vol 111 (3) ◽  
pp. 244-252 ◽  
Author(s):  
N. Ramesh Babu ◽  
V. Radhakrishnan ◽  
Y. V. G. S. Murti
Keyword(s):  
Mechanical Properties ◽  
Laser Pulses ◽  
Grinding Wheel ◽  
Thermal And Mechanical Properties ◽  
Grinding Wheels ◽  
Wheel Surface ◽  
Laser Dressing ◽  
Dressing Tool ◽  
Vitrified Bond ◽  
Preliminary Study

Investigations on the use of laser as a dressing tool for grinding wheels have been carried out and the results are reported in a two paper sequence. This paper reports the results of preliminary investigations on grinding wheel materials after laser irradiation. Studies were carried out on the surfaces of aluminum oxide (Al2O3), and silicon carbide (SiC) grains, vitrified bond and also on a sample Al2O3 grinding wheel after irradiating them with high intensity Nd:YAG laser pulses. The results obtained are discussed with reference to the optical, thermal, and mechanical properties of the materials. This paper also includes the studies on the wheel surface topography obtained after laser dressing the wheel with different dressing feed rates.

Selection of Sampling Parameters for Modeling Grinding Wheels

1970 ◽  
Vol 92 (3) ◽  
pp. 667-676 ◽  
Author(s):  
S. J. Deutsch ◽  
S. M. Wu
Keyword(s):  
Moving Average ◽  
Grinding Wheel ◽  
Autoregressive Moving Average ◽  
Grinding Wheels ◽  
Discrete Approximations ◽  
Moving Average Models ◽  
Sample Interval ◽  
New Criterion ◽  
Autoregressive Moving Average Models ◽  
Selection Of

Autoregressive-moving average models are developed to represent grinding wheel profiles for different combinations of sampling parameters including the sample interval, the number of observations, and the length of record. Using 46 and 120 grit grinding wheels, the effects of the choice of sample interval and number of observations on the appropriate model form are investigated. Discrimination between models for different grit size grinding wheels is discussed. A new criterion is proposed for the selection of the sample interval, based on observations per grit (OPG), to achieve comparable discrete approximations of the wheels and to maximize discrimination between models of different wheels.

Abrasive Grain Efficiency and Surface Roughness in Machining Magnesium Alloys by Newly Developed Cup-Type Diamond-Grinding-Wheels

2009 ◽  
Vol 620-622 ◽  
pp. 769-772
Author(s):  
Tien Dong Nguyen ◽  
Koji Matsumaru ◽  
Masakazu Takatsu ◽  
Kozo Ishizaki
Keyword(s):  
Surface Roughness ◽  
Magnesium Alloys ◽  
Unit Length ◽  
Grinding Wheel ◽  
Light Metals ◽  
Grinding Wheels ◽  
Wheel Surface ◽  
Abrasive Grains ◽  
Diamond Grinding ◽  
Abrasive Grain

New cup-type diamond-grinding-wheels with hexagonal pattern have been developed. Grinding stone ratio, R is defined as the ratio between the hexagonal edge area containing abrasive grains and the total area of the wheel surface. In the present work, four kinds of hexagonal grinding wheels with different R (13 %, 19 %, 25 % and 36 %) and a conventional wheel (R: 100 %) were used to grind a light metals, which was represented by magnesium alloy AZ31B. Efficiency of abrasive grains and ground surface for machining a light metals were evaluated by calculating the number of abrasive grains which pass through a unit length of a sample surface for each grinding pass, Ng. The results show that surface roughness becomes smaller, i. e., smoother surfaces as Ng increases. Surfaces ground by the conventional wheel are rougher than those by using newly developed hexagonal grinding-wheels in spite of the larger Ng for the conventional wheel. Surface roughness data forms one curve in roughness vs. Ng graph for all hexagonal wheels, and forms another curve for the conventional grinding-wheel. The difference of two curves indicates that the number of effective working abrasive grains in hexagonal wheels is about 5 times higher than that of the conventional wheel. The similar results were obtained for machining sapphire according to our previous work. Hexagonal wheels show higher abrasive grain efficiency for machining not only hard-to-machine ceramics but also light metals such as magnesium alloys than conventional wheels.

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