Abstract
The dimensional accuracy and mechanical properties of metal components formed by the Single Point Incremental Forming (SPIF) process are greatly affected by the prevailing state of residual stress. An X-ray diffraction method has been applied to achieve an understanding of the residual stress formation caused by the SPIF process of deep drawing a quality steel sheet drawpiece. The test object for an analysis of residual stress distribution was a conical truncated drawpiece with a slope angle of 71° and base diameter of the cone of 65 mm. The forming process has been carried out on a 3-axis HAAS TM1P milling machine. Uniaxial tensile tests have been carried out in the universal tensile testing machine to characterize the material tested. It was found that the inner surface of the drawpiece revealed small linear grooves as a result of the interaction of the tool tip with the workpiece. By contrast, the outer surface was free of grooves which are a source of premature cracking. The stress profile exhibits a nonlinear distribution due to different strengthening of the material along the generating line of the truncated conical drawpiece. The SPIF parts experienced a maximum residual stress value of about 84.5 MPa.
Highlights
Single Point Incremental Forming (SPIF) is a sheet metal forming process which involves forming by local stretching of the sheet with a pin tool
In SPIF, the state of residual stress can be influenced by adjusting the process parameters during the machining process [4]
During the experimental tests truncated cones were made with a slope angle α = 70–72◦ and with different step size ap, and feed rates
Summary
Single Point Incremental Forming (SPIF) is a sheet metal forming process which involves forming by local stretching of the sheet with a pin tool. Incremental Sheet Forming (ISF) allows the forming of complex parts with a much higher degree of deformation than conventional deep drawing or stretch forming processes [1,2]. Springback is one of the main problems associated with incremental forming processes. The amount of springback is affected by the geometry of the drawpiece, the mechanical properties of the sheet material and the tension applied [3]. In SPIF, the state of residual stress can be influenced by adjusting the process parameters during the machining process [4]. The large levels of deformation occurring in SPIF induce highly non-uniform residual stresses that affect the shape and dimensional accuracy of the formed parts
Sign-in/Register to view highlights & summary 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.
