Estudo da vibração durante o corte e centelhamento na retificação cilindrica de mergulho

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

The main objective of this work is to analyse the use of the vibration of the grinding process to determine the dressing moment. To reach this goal a cylindrical plunge grinding process was used. Three sparkout times were tested, as well as 2 workpiece velocities and 2 dressing overlap factors. Beside this, the grinding was done with 2 different grinding wheels. The parameters evaluated in the workpiece were roughness, circularity and the burning presence. An acelerometer was attached to the tailstock of the machine and it was acquired vibration signals during the grinding as well as during the final second of the sparkout. From the vibration signals it was extracted the RMS and the frequency spectrum. Analysing the experimental results, one can conclude that, to the aluminum oxide grinding wheel, the sparkout time influences the mean roughness of the workpieces, the same happening to the dressing condition. The velocity of the workpiece has no relation with the roughness, the same happening with the grinding vibration. Related to sparkout, the low frequency vibration (between 50 Hz and 700 Hz), presented a better relationship to wheel wear than high frequency vibration (between 1000 Hz and 2000 Hz). The SG grinding wheel presented a higher volumetric loss than the aluminum oxide grinding wheel and with the conditions used, the vibration of the process was not able to detect the wheel wear. The original feature of this work, is the study of the final of the sparkout and in the indication that, for the conditions tested, the practical of defining the dressing moment through the sound of the process has no relation with the workpiece quality parameters and, therefore, it is not a technical criterion for establishing the moment to dress the wheel

ASSUNTO(S)

retificação e polimento vibração usinagem

ACESSO AO ARTIGO

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