プラスティシンモデル実験による正面研削の研究(第2報)

被削材流動形態

抄録

Model tests of two-dimensional grinding are carried out where the work is made of clay, Plasticine and the mode of grid line deformation of work is observed. The symbols are written on the work surface before cutting in order to investigate the state of the outer and inner chip surface. These experiments give some results as follows: (1) The chip formation in grinding is discontinuous and occurred by shearing deformation that includes large slip. As the rake angle is reduced, the deformation contains squeezing under the cutting edge. (2) When the rake angle is very small, the work surface before cutting remains on that after cutting. The part of the former work surface is sucked into the work on the chip-tool interface. (3) As the rake angle increases or the cutting speed decreases, the mechanism of the work deformation comes to the formation of a continuous chip, the velocity of the chip formation drops down and the transforming area in the cutting direction is expanding.