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|Type:||Artigo de periódico|
|Title:||Experimental evaluation on grinding wheel wear through vibration and acoustic emission|
|Abstract:||The dressing process is necessary to reestablish the surface of the grinding wheel, when its grains lose their edges and break due to the wheel wear. Dressing must be done to avoid part rejections caused mainly by roughness increase. The determination of the exact moment to accomplish the dressing process (known as the end of wheel life) is still a problem without a precise solution. Generally, machine operators decide when to dress the wheel based on their own experience. During the last years, several works have been done in order to build grinding monitoring systems that could determine the end of grinding wheel life in a more precise way, without the need of an operator. The objectives of this work follow this trend. Hardened steel workpieces were ground until their surface roughness reached values considered intolerable for grinding process. At the same time, vibration and acoustic emission sensors attached on two points of the grinder machine monitored the process, in order to indirectly establish the wheel condition and the moment to dress it. Besides that, the signals from these sensors were also used to determine the duration of spark out and elastic deformation phases of the grinding cycle. The vibration sensor proved to be the best one to establish the end of wheel life; the acoustic emission sensor is the most suitable to determine the time spent on elastic deformation and both acoustic emission and vibration sensors are able to detect the end of spark out phase. (C) 1998 Elsevier Science S.A. All rights reserved.|
|Editor:||Elsevier Science Sa|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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