Abstract
Cutting process of an abrasive grain in grinding is transitional and it is not from the beginning of contact between a cutting edge and the metal being cut, but after the plastic region following the elastic one, that cutting chips are generated.Therefore, deformation process of the metal being cut in the plastic region preceding the cutting one should first be investigated to make clear the chip formation mechanism in the transitional cutting.From the above mentioned point of view, the plastic deformation process has been analyzed, paying a special attention to the pile-up phenomena ahead of the rake surface and the chip formation mechanism has been investigated in the low speed transitional cutting.Leading conclusions are as follows;1) In the plastic region, the metal being cut is plastically deformed and piled up ahead of the rake surface. The pile up shead of the rake surface developes with the depth of cut, but the development in similar shape of the pile up with the depth of cut results in no chip formation because the plastic deformation under the rake surface is very stable in the case.2) When the profile angle of the pile up ahead of the rake surface reaches a critical value, a crack originates at the free surface of the pile up. The propagation of the crack leads to discontinuous chip formation.
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