Abstract
An automatic approach system for a grinding wheel is desired from production engineers, since the manual approach in not easy even for skilled operators. Therefore, a wheel-contact-prediction system using a hydrophone has been developed and the effects of clearance between a grinding wheel and a workpiece, Δy, on acoustic power, U, are investigated. As a results, U in between 5 kHz to 30 kHz remarkably increases with the decrease of Δy. The higher the grinding fluid flow rate, wheel peripheral speed and porosity of the grinding wheel, the larger the acoustic power becomes. A hydrophone assisted automatic wheel-positioning system has been developed and its performance has been experimentally investigated. As a result, wheel-positioning accuracy improves with the decrease of wheel approach speed, VR; However, a lower VR results in time loss in automatic wheel approach. Therefore, VR is controlled to be decreased step by step by changing the trigger level and the achieved Δy is between 20 to 100 μm and the positioning time is approximately 10 s from 5 mm distance.
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