Difference in Grinding Mechanism between Up- and Down-cut Creep Feed Grindings

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  • クリープフィード研削における上向きおよび下向き研削機構の相違
  • クリープ フィード ケンサク ニ オケル ウワムキ オヨビ シタムキ ケンサク

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Abstract

This paper aims to reveal the difference in grinding mechanism between up- and down-cut creep feed grindings. According to the experiments, both the normal and tangential components of mean grinding force have always become larger in up-cut than in down-cut under the usual creep feed grinding conditions, and the difference has become 1. 7 times at maximum. It was found from the force measurements on a single grain that its normal to tangential ratio remained constant at about 2.5 throughout a grain-workpiece engagement in down-cut, but it became up to about 7 at the beginning of engagement in up-cut, which implies much occurrences of rubbing and/or plowing, hence leading to a larger grinding force. Then it is introduced that this mean grinding force at down-cut can be estimated quantitatively from the conventional grinding force data.

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