Research of shrinking of chip under turning of steels by restored plates

The article presents the results of a study of the deformation of the shear layer during the treatment of steels with reduced MNE. Comparison of shrinkage shavings during rough turning of steels showed that processing modes have a great value on the shrinkage value. So, with an increase in the cutting depth from 1 mm to 2.5 mm, chip shrinkage for Sandvik Coromant inserts decreases from 2.9 to 2.6, and for reduced ones it increases from 1.8 to 2.0. Feed increase from 0.1 to 0.5 mm / rev. reduces chip shrinkage from 3.5 to 2.9 for new inserts and from 2.4 to 1.8 for reconditioned ones. This is due to the fact that the process of plastic deformation is greatly influenced by the shape of the front surface of the restored plates, which in this case corresponds to the optimal conditions for chip formation. As a result of experimental studies, it was found that the obtained shape of the front surface of the plates provides stable chip breaking and chip cutting.