Experimental study of chip shrinkage for radius rear surface turning tools

The determination of chip shrinkage is important because it contributes to the optimal choice of machining modes at the stage of process design. Additionally, the shrinkage makes it possible to determine not only the change of the value, but also the intensity of the temperature and deformation characteristics during the cutting process. The article describes experimental study of the chip shrinkage when steel 45 shafts are machined using radius rear surface turning tools. The scheme for outer longitudinal turning using radius rear surface cutters is described. The cases with positive and negative cutter edge angles are examined. The following parameters are considered as variables: feed in the range of 0.11–0.52 mm/rev., cutting depth in the range of 0.1–0.5 mm, cutting tool angle in the positive and negatives ranges of 30–60°. The influence of the machining parameters on the longitudinal and transverse chip shrinkage is shown through graphs. Based on the results of the study, conclusions on the influence of the turning parameters on the degree and nature of the changes in chip shrinkage have been drawn. The results of the study can be useful for the design of technological process of machining operations and the design of cutting tools.

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