| Research Abstract |
In creep feed grinding, the maximum grain depth of cut becomes smaller, and so the cutting force on an effective edge becomes smaller. Then the loading and grazing often occurs on the working face of the grinding wheel. Because of a long arc of contact, the temperature at the grinding point rises with the increase of cutting force. Consequently thermal damage such as a burn mark is often made on a workpiece. In order to prevent the formation of the burn mark, vibratory creep feed grinding is proposed in this study. The workpiece was forced to vibrate in the table feed direction, that is to say, the frequency fis 30Hz and amplitude 2A is from 0.32 to 1.5mm. In order to clarify the effectiveness of the vibratory creep feed grinding, the grinding performance are experimentally investigated. The main results obtained are as follows : (1) The grinding power in the vibratory creep feed grinding becomes smaller than that in the conventional creep feed grinding. (2) Vibratory creep feed grindi
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ng is effective for the prevention of the burn mark in case of down-cut grinding of SKH4 and SUS304 under the wheel depth of cut 3mm and the table speed 0.179mm/s. However, the wheel wear in vibratory creep feed grinding becomes larger than that in the conventional creep feed grinding. (3) In the vibratory creep feed grinding of SKH4, the burn mark was prevented under the amplitude 2A of 1.0mm or 1.5mm. Moreover the radial wheel wear in the vibratory creep feed grinding of SHK4 with WA abrasive grinding wheel becomes smaller than that in the conventional creep feed grinding, (4) In down-cut vibratory creep feed grinding, more grinding fluid is supplied to the wheel-workpiece contact area than in the conventional creep feed grinding. However, in up-cut vibratory creep feed grinding, the amount of grinding fluid supplied does not increase. (5) In vibratory creep feed grinding, both radial wheel wear and vertical grinding force increase with the increase of the wheel depth of cut under the same metal removal rate. Less
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