ITB Journal - Institute of Technology Blanchardstown

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ITB Journal 16. Mustafa K, Robust Formant Tracking for Continuous Speech with Speaker Variability, Dept. of Electrical and Computer Engineering, McMaster University, [online] http://grads.ece.mcmaster.ca/~mkamran/Research/Thesis%20Chapters/3%20-%20The% 20Formant%20Tracker%20-%20pp.%2041-70.pdf Issue Number 9, May 2004 Page 18
ITB Journal Design of a Wear Test Machine for Diamond Saw Segment D. Nulty J. Dwan and Y. Blake Department of Mechanical Engineering, Institute Technology Tallaght, Dublin 24. Abstract Diamond tools are used in a wide range of industrial areas such as construction industry, metal machining and exploration drilling. The diamond impregnated tools used in the stone and construction industry are metal matrix composites. Diamond saw blades are the most commonly used tools. The optimum operation of diamond saw blades is determined by the cutting action of the diamond grit and the bounding of the metal matrix. However the wear behavior of the diamond saw has been less studied. Currently in the blade development, actual full blade tests often have to be conducted for optimization and the testing process is very slow and expensive to carry out. So the development of a testing machine that could reduce the blade development time would be very advantageous. This paper describes the design and construction of a wear apparatus which simulates the wear conditions that a diamond impregnated saw blade experiences by using just a single segment. It is also our intention to present single segment wear tests on ceramic-based materials, which can be used for the testing and developing of a full blade diamond saw. 1. Introduction Diamond tools are used in a wide variety of applications of which the most important include the drilling and sawing of rocks and concrete, grinding of glass or metals, polishing of stone. The most dramatic increase in the importance and growth of industrial diamonds have been the advent of synthetic diamonds and the use of diamond tools into the stone and construction industries [1]. Nowadays synthetic diamond holds the largest share at 90% of the industrial diamond tool market [2]. 1.1 Diamond saw blades Diamond impregnated tools consists of randomly dispersed and orientated diamond crystals in a metal matrix which bonds diamond together. As the tool cuts the matrix erodes away from the diamond. This exposes the diamond and gives the diamond crystals clearance for penetrating the material and also allows the cuttings to be flushed out. For proper operation the metal bond must wear away progressively so that new diamonds are exposed to continue the cutting action during the life of the diamond tool. The key factors that determine the choice of matrix metal include (a) the wear resistance of the matrix; (b) the type and size of diamonds to be used and (c) the tool fabrication process. For a particular application, currently the blade is selected by picking a stock item recommended by the tool manufacturer. However, often an off-the-shelf blade does not fully fulfill the requirements of blade life and cutting performance. At this stage, the diamond tool manufacturer has to develop a new matrix either by modifying the existing matrix or by designing a completely new matrix. Where full scale blade testing is carried out on different Issue Number 9, May 2004 Page 19
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