Extrusion and friction of the rake face and its influence on chip deformation

Extrusion and friction of the rake face and its influence on chip deformation

     After the cutting layer metal is deformed by the shear slip in the first deformation zone, in order to discharge the chips along the direction of the rake face, it must be further deformed by the extrusion and friction of the rake face. This deformation is mainly concentrated in a thin layer of metal on the bottom surface of the chip that rubs against the rake face. This area is the second deformation zone. The characteristics of the deformation in the second deformation zone are: the bottom layer of the chip is fibrillated near the rake face, and the chips flow When the speed slows down, the underlying metal will even stay on the rake face; the fibrous grains of the chip bottom are elongated, forming chip curling; the heat generated by friction increases the temperature of the chip bottom and the rake face. The squeezing and friction on the surface not only cause the deformation of the second deformation zone, but also affect the first deformation zone.