Abstract
Residual stresses in the surface layer exert a significant impact on functional aspects of machined parts. Their type and value depend on the workpiece and tool material properties, cutting parameters and cooling and lubrication conditions in the tool-chip-machined surface interface. As the effects of material properties and cutting parameters have been widely studied, the influence of cooling and lubrication conditions, especially minimum quantity lubrication (MQL) on the surface layer residual stresses and the relationships between them have not been investigated. In this paper the effects of dry, MQL cutting and cutting with emulsion conditions together with cutting parameters on residual stresses after turning AISI 316L steel were investigated. X-ray diffraction method was used for measuring superficial residual stresses in the cutting (hoop) and feed (axial) directions. Tensile residual stresses were detected in both directions and the values in the cutting direction turned out to be higher than in the feed direction. The effects of cooling and lubrication conditions largely depend on the selected cutting parameters, whose influence is linked to the cutting zone cooling and lubrication mode. Elaborated regression functions allow calculation and optimization of residual stresses in turning AISI 316L steel, depending on cooling and lubrication conditions as well as cutting parameters.
Highlights
Residual stresses in the surface layer determine many application related characteristics of a machined part
The experimental results indicate that residual stresses in the surface layer are mostly a consequence of complex interactions of the mechanical and thermal effects leading to inhomogeneous plastic deformation associated with the process of chip formation and an interaction between the tool and the freshly machined surface [1,2,3,4,5,6,7,8]
In such cutting conditions the highest values of hoop and axial residual stresses were observed in turning with emulsion (494 and 370 MPa) and the lowest in dry machining (327 and 108 MPa), while their values in cutting with minimum quantity lubrication (MQL) lay in between
Summary
Residual stresses in the surface layer determine many application related characteristics of a machined part. Their type and value depend on the work piece material and tool properties, cutting parameters as well as on the cooling and lubrication conditions in the tool-chipmachined surface interface. The experimental results indicate that residual stresses in the surface layer are mostly a consequence of complex interactions of the mechanical and thermal effects leading to inhomogeneous plastic deformation associated with the process of chip formation and an interaction between the tool and the freshly machined surface [1,2,3,4,5,6,7,8]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
